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Patent US20040220602 - Surgical cutting accessory with encapsulated RFID chip - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA cutting accessory for use with a powered surgical tool. The accessory includes a drive shaft to which an outer hub is attached. Internal to the outer hub is a self-contained transponder formed from an RFID chip and a coil of electrical conductor embedded within a solid substrate or encapsulated within...http://www.google.com/patents/US20040220602?utm_source=gb-gplus-sharePatent US20040220602 - Surgical cutting accessory with encapsulated RFID chipAdvanced Patent SearchPublication numberUS20040220602 A1Publication typeApplicationApplication numberUS 10/782,374Publication dateNov 4, 2004Filing dateFeb 19, 2004Priority dateAug 8, 2002Also published asUS7887559, US8157826, US20110089248Publication number10782374, 782374, US 2004/0220602 A1, US 2004/220602 A1, US 20040220602 A1, US 20040220602A1, US 2004220602 A1, US 2004220602A1, US-A1-20040220602, US-A1-2004220602, US2004/0220602A1, US2004/220602A1, US20040220602 A1, US20040220602A1, US2004220602 A1, US2004220602A1InventorsWenjie Deng, Barry KaukerOriginal AssigneeWenjie Deng, Kauker Barry J.Export CitationBiBTeX, EndNote, RefManPatent Citations (37), Referenced by (117), Classifications (10), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetSurgical cutting accessory with encapsulated RFID chip
DETAILED DESCRIPTION [0030] The surgical tool system 18 of this invention, as seen in FIGS. 1 and 2, includes an endoscopic handpiece 20, sometimes called a surgical tool. A complementary cutting accessory 22 is attached to the handpiece 20. The handpiece 20 includes a generally cylindrical, elongated housing 24. The distal end of the housing 24 is formed with a bore 26 for receiving the proximal end of the cutting accessory 22. (Throughout this document, “distal” is understood to be away from the face of the surgeon holding the handpiece 20; “proximal” is understood to mean towards the face of the surgeon.) A motor 28, depicted in phantom, is disposed inside the housing 24. A rotating output shaft 30, which is connected to the motor 28 for actuation by the motor, is disposed inside bore 26. A coupling assembly 32 is mounted to the front end of the housing 24 for removably holding the cutting accessory 22 to the handpiece 20. [0031] The cutting accessory 22 includes a drive hub 34 that releasably engages the output shaft 30. For the purposes of this invention, the exact geometry of the output shaft 30 and drive hub 34 that facilitate the releasable engagement of these components is not relevant. By way of example though, in the depicted version of the invention, a drive pin 36 extends through the distal end of motor output shaft 30. The drive hub 34 is formed to have a slot 37 that extends forward from the proximal end of the hub. When the cutting accessory 22 is fitted in handpiece bore 26, the shaft drive pin 36 seats in the drive hub slot 37. The seating of the drive pin 36 in the drive hub slot 37 causes the drive pin to impart the rotational moment of the output shaft 36 to the drive hub 34. [0032] The cutting accessory 22 includes a static outer hub 38 that surrounds the drive hub 34 that is held in housing bore 26 by the coupling assembly 32. A tubular drive shaft 40 is integrally attached to the drive hub 34 and extends forward, distally from the drive hub 34 through the outer hub 38 and forward from the handpiece 20. A cutting head, such as a burr or open window shaver, shaver illustrated, is attached to or integrally formed with the distal end of the drive shaft 40. A tubular-shaped outer shell 42, sometimes called the outer housing, extends forward from the outer hub 38 and surrounds the drive shaft 40. The extent to which the distal end of the outer shell 42 surrounds the drive shaft 40 cutting head is a function of the design of the particular cutting accessory 22. It should be further understood that the distal end of the drive shaft 40 is provided with an opening 41 through which suction is drawn from the surgical site. [0033] When the surgical tool system 20 of this invention is employed to perform a surgical procedure, irrigating fluid is introduced into the site through the distal end of the cutting accessory. This fluid may be flowed to the site through the annular space between the drive shaft 40 and the inner wall of outer shell 42. Alternatively, the fluid is introduced through a separate cannula that opens into the surgical site. Suction is drawn through the handpiece 20 and drive shaft 40 of the accessory 22 to remove irrigating fluid and the material entrained in the irrigating fluid. [0034] Handpiece housing 24 is formed with an elongated bore 50 that extends axially through the housing. The distal end of bore 50 is located rearwardly from the proximal portion of the bore 26. While not seen in the drawings, it should be understood that bore 50 is the space in which the handpiece motor 28 is seated. The distal end of housing 24 is formed to have a ring-shaped head 52 that defines a first counterbore 54 that is coaxial with bore 50. Immediately proximal to head 52, housing 24 has a second counterbore 55 also coaxial with bore 50. Second counterbore 55, which has a diameter between that of bore 50 and the first counterbore 54, is a transition bore between bore 50 and the first counterbore 54. A suction bore 56 branches off of bore 50. Suction is drawn through the cutting accessory drive shaft 40 through the suction bore 56. Partially seen in FIG. 2 is a valve bore 58 that intersects the suction bore 56. A valve (not illustrated) is disposed in the valve bore 58 for regulating the suction flow through the cutting accessory 22 and the handpiece 20. [0035] The coupling assembly 32, now described primarily by reference to FIGS. 2, 3 and 4, is secured to the distal end of the handpiece housing 24. Specifically, the coupling assembly 32 includes a generally ring-shaped collet 60 that is secured to the housing 24. Collet 60 is the portion of the handpiece 20 that defines bore 26. A locking ring 62 is movably disposed in the collet 60. A cover plate 64 is fitted over the collet 60 and locking ring 62 so as to hold the locking ring to the collet. A wave spring 66 seated between the collet 60 and the locking ring 62 biases the locking ring into a locked state in which the ring holds the cutting accessory outer hub 38 in handpiece bore 26. [0036] The collet 60, is formed of a plastic able to withstand the rigors of steam sterilization, such as a polyphenylsulfone plastic, one such plastic being sold under the trademark RADEL by Amoco Chemicals/British Petroleum. In some versions of the invention, the plastic forming the collet 60 is 15 to 30% carbon filled PEEK. The collet 60, as seen in detail in FIGS. 4, 5 and 6, includes a sleeve-shaped base 70. Extending distally from base 70, the collet 60 has a head 72 that has an outer diameter greater than the outer diameter of the base 70. Bore 26 extends axially through collet 60, from the distal end of head 72 to the proximal end of base 70. Collet 60 is further formed so that head 72, has an arcuate-shaped recessed section 74 that surrounds between 190� and 250� of the outer circumference of the collet. In more preferred versions of the invention, recessed section 74 surrounds between 230� and 240� of the outer circumference of head 72. Within recessed section 74, collet head 72 is further shaped to have a laterally extending slot 76 that opens into bore 26. Immediately proximal to slot 76, the collet head 72 is shaped so as to have two small flat surfaces 78 that angle away from an apex that is parallel with the longitudinal axis of the collet 60. Collet head 72 is further formed so that within each flat surface 78 there is a groove 80 with a flat base surface recessed from the associated flat surface 78. [0037] Collet 60 is formed so that within head 72 and the adjacent distal section of base 70 there is an inner wall 82 with a constant diameter circular cross-sectional profile that defines the distal portion of bore 26. Within head 72, collet 60 is further formed so that there is an arcuate groove 84 that extends inwardly of wall 82, away from the center axis of the collet. Groove 84 is diametrically opposite the arcuate section of collet head 72 inscribed by slot 76. Collet 60 is further shaped to have two diametrically opposed slots 86 that extend proximally away from the distal end opening of head 72 and terminate immediately forward of the proximal end of the head. Slots 86 are diametrically opposed from each other. A first one of the slots 86 intersects slot 76; the opposed slot 86 intersects groove 84. It should be understood that groove 84 has a depth greater than that of the intersecting slot 86. As will be understood hereinafter, the greater depth of groove 84 is designed to provide space so that the adjacent section of the locking ring 62 can extend into the portion of groove 84 located below the intersecting slot 86. [0038] Collet 60 is further formed to have a skirt 88 that extends proximally from the proximal end of head 72 and circumferentially surrounds the adjacent distal end of base 70. More particularly, it will be noted that skirt 88 is spaced away from the outer surface of the portion of the base surrounded by the skirt so as to define an annular space 90 between these two components of the collet 60. Skirt 88 is shaped so that around its outer surface there are two spaced apart, circumferentially extending grooves 91. [0039] The collet 60 is shaped so that the portion of base 70 that extends rearwardly from head 72 has both a generally constant outer diameter and wall thickness. The proximal end of the base 70 has an annular tail section 92 that is stepped inwardly from the more distal portions of the base. More particularly, there is a stepped surface 94 along the outside of the base between the distal portions and tail section 92 that has a curved cross-sectional profile. Also, collet 60 is shaped so that inside base 70, immediately distal to tail section 92, there is an inner wall section 96, immediately proximal to wall 82, with an inwardly curved profile. [0040] Locking ring 62 is formed of a sterilizable metal, such as stainless steel. The locking ring 62, now described by reference to FIGS. 4, 7 and 8, is shaped to define a center opening 102 with a shape that is oval. Locking ring 62 is further formed to have a lip 104 that projects into opening 102 from one of the curved ends of the ring. Lip 104 provides the end of the ring 62 with which it is integral a taper such that the overall wall thickness of the ring increases along a line that extends proximally away from the distal-facing side of the ring. [0041] A release button 106 is integrally formed with the locking ring 62 so as to be located on the side of the ring opposite the side with which lip 104 is integral. More specifically, release button 106 both subtends the end of the ring to which the button is mounted and extends proximally away from the ring. A slot 108 is formed in the portion of the ring 62 to which release button 106 is attached. Slot 108 opens into center opening 102 and has the same cross-sectional profile as the slots 86 formed in collet 60. [0042] As part of the assembly of handpiece 20 of this invention, collet 60 is attached to handpiece housing 24. Specifically, the collet base 70 seats in the second counterbore 55, as seen in FIG. 2. Prior to the attachment of the collet to the handpiece housing 24, a coil 110 is seated in annular space 90. The coil, which may be a wire wrap or a conductive trace formed on a flexible substrate, is the coil used to facilitate inductive signal transfer to/from a radio frequency identification device (RFID) chip 170 disposed in the accessory outer hub 38 (FIG. 12). Coil 110 is connected to downline signal processing components through conductors 114 that extend through a longitudinally extending bore 113 formed in the handpiece housing 24. [0043] An O-ring 116 extends around the collet base tail section 92. O-ring 116 abuts the stepped surface of housing 24 that defines the transition from bore 50 to second counterbore 55. More particularly, the stepped surface of housing 24 is formed to define a groove 118 with an arcuate profile in which O-ring 116 seats. The inner portion of O-ring 116 is seated against the curved collet step surface 94. [0044] Collet 60 is secured to handpiece housing 24, in part, by an adhesive capable of withstanding the rigors of sterilization, such as a silicone adhesive. The adhesive is placed between the opposed surfaces of housing head 52 and collet skirt 88. A fraction of the adhesive collects in the grooves 91 that extend around the outer surface of skirt 88. Upon the curing of the adhesive in the grooves, the adhesive forms two O-rings 119 between the housing 24 and the collet 60. The O-rings 119 prevent fluid flow from the ambient environment moving through the handpiece-collet interface. [0045] Removable set screws, not illustrated, further hold the collet 60 to the distal end of the housing 24. These set screws extend through threaded bores 117 formed in the distal end of the handpiece housing 24 (one bore shown in FIG. 1). The ends of the set screws set in recesses 120 formed in the outer surface of collet base 70 (one recess shown in FIG. 4). [0046] Locking ring 62 is slip-fitted in collet slot 76. More particularly, the locking ring 62 is attached to the collet 60 so that the end of the ring with which lip 104 is integral seats in groove 84. When the locking ring 62 is fitted to the collet 60, the release button extends rearwardly, over flat surfaces 78 and the adjacent portion of the recessed section 74. [0047] The wave spring 66 is disposed-between the collet head 72 and the release button 106. Specifically, each end of the wave spring 66 is seated in a separate one of the grooves 80 formed in the collet head 72. The topmost crest portion of the wave spring is fitted against a recessed surface 122 formed in the release button 106 immediately proximal to locking ring 62. [0048] Cover plate 64 is snap-secured in the recess 74 formed in the collet head. The cover plate 64 has an arcuate shape corresponding to that of the collet recess 74. There is an opening 124 in the center of the cover plate 64 through which release button 106 extends. In the illustrated version of the invention, the cover plate 64 has a center section 126 with greater wall thickness than that of the surrounding ends. Opening 124 is formed in the center section 126. [0049] The static outer hub 38, which is formed of rigid plastic, is now described by reference to FIGS. 9, 10 and 11. The outer hub 38 is constructed to have a sleeve-shaped base 130. The base 130, it will be observed, is formed with two diametrically opposed, generally rectangularly shaped openings 132. Extending forward from base 130 and formed integrally therewith is a substantially solid head 133. While head 133 is substantially solid, the outer hub 38 is formed so that a bore 134 extends axially through the head. Outer shell 42 is mounted in bore 134 in any conventional manner to extend forward from head 133. In the depicted version of the invention, the outer surface of hub head 133 is provided with threading, not identified. The threading is provided to facilitate the releasable screw securement of the cutting accessory 22 to a cannula fitted in the portal formed in the patient and directed towards the surgical site. [0050] Outer hub 38 is further formed to have two diametrically opposed ears 135 that are integrally formed with, and extend outwardly from, the base 130. Each ear 135 is formed so as to have a relatively short proximally-directed face 136 that extends laterally away from the longitudinal axis of the hub 38. Distal to face 136, each ear 135 has a parallel distally directed face 138. A side surface 137 extends between the opposed faces 136 and 138 of ear 135. Each ear is formed such that the side surface 137 has a rise or taper at least adjacent the proximally-directed faces 136 such that the overall thickness of the ear 135 increases moving away from face 136. In some versions of the invention, the ears 135 are formed so that side surfaces 137 have a profile that, extending from the proximally-directed faces 136, is curved or arcuate. [0051] In the depicted version of the invention, laterally extending grooves 131 are formed in the distal end of the outer hub base 130. The grooves 131 extend circumferentially around the base. Two longitudinally offset, parallel sets of grooves 131 are shown. Each set of grooves consists of a set of spaced apart grooves. The presence of grooves 131 are in response to the plastic manufacturing process used to produce the outer hub base 130. Specifically, plastic molded parts typically shrink as they cool during the latter stages of the manufacturing process. To prevent the surface of the plastic molded part from distorting due to non-uniform shrinkage, grooves are frequently provided in the plastic part. The grooves function, in layman terms, as a “reduce sink” that allows the remainder of the plastic part to shrink uniformly, thereby preventing surface distortions. Accordingly, grooves 131 are provided to facilitate the injection molding of the outer hub base 130. [0052] A generally tube-shaped coil seal 139 is disposed in hub base 130. Coil seal 139 is formed from flexible sterilizable material. In one version of the invention, coil seal 139 is formed from a silicon rubber that has 55 Shore A durometer hardness. The coil seal 139 is shaped to have a first end section, distal end section 140, that has a constant outer diameter and inner diameter. Extending proximally from the distal end section 140, the coil seal 139 has a main section 142. Main section 142 has the same inner diameter as distal end section 140 and a narrower outer diameter. The coil seal 139 is further formed to define a generally rectangular recess 144 in the outer surface of main section 142. Located proximal to main section 142, the coil seal 139 has a second end section, proximal end section 146. The inner and outer diameters of proximal end section 146 are the same as those of the distal end section 140. The proximal end section 146 of the coil seal 139 is further formed to have two diametrically opposed lock tabs 148. Each lock tab 148 extends radially outwardly from the outer surface of the proximal end section 146. The proximal end section 146 also has two diametrically opposed stop tabs 150 that extend inwardly from the inner wall of the section. In the depicted version of the invention, each stop tab 150 is radially aligned with a separate one of the lock tabs 148. [0053] Coil seal 139 is further formed to have a tail section 152 that extends rearwardly from the proximal end section 146 and that forms the proximal end of the seal. The tail section 152 is formed to define two annular spaced apart ribs 154 and 156 that extend circumferentially around coil seal 139. Both ribs 154 and 156 extend beyond the outer diameter of the seal locking section 146. In the depicted version of the invention, the diameter of the circle subtended by the more proximal of the two ribs, rib 156, is less than the diameter subtended by the other rib, rib 154. Tail section 152 is further formed to have an inner wall that is outwardly flared. [0054] When a cutting accessory 22 of this version of the invention is assembled, an RFID chip 170, seen in FIG. 12, is seated in seal recess 144. A coil 172 connected to the chip 170 is disposed over the reduced diameter outer surface of seal main section 142. In the version of the invention depicted in FIG. 12, the chip 170 is mounted on a small flex circuit 171; the coil 172 is a conductive trace formed on the flex circuit 171. After manufacture of the flex circuit 171, the flex circuit, with the chip 170 mounted thereon, is wrapped in a cylinder over seal main section 142 so that the chip seats in recess 144. [0055] The RFID chip-coil-and-seal assembly is fitted in hub base 130. Consequently, both the RFID chip 170 and coil 172 are disposed between the inner wall of the hub base and the outer surface of coil seal 139. Owing to the relative dimensions of outer hub 38 and coil seal 139, the outer surfaces of the seal's distal end and proximal end sections 140 and 146, respectively, press against the inner wall of the hub base 130. This contact forms a seal around chip 170 and coil 172. Thus, in some versions of the invention, there may not be a need to employ an adhesive or other chemical to provide a moisture barrier around the chip 170 and coil 172. [0056] As part of the insertion of the coil seal 139 into the outer hub 38, lock tabs 148 are seated in hub base openings 132. The seating of the lock tabs 148 in openings 132 holds the coil seal 139 to the outer hub 38. When the coil seal 139 is so attached to outer hub 38, tail section ribs 154 and 156 are located proximal to the proximal end opening of the hub. [0057] As described above, the drive hub 34, now described by reference to FIG. 2, transfers the rotary motion of the handpiece output shaft 30 to the cutting accessory drive shaft 40. The drive hub has a stem 173 that is the proximal end portion of the drive hub. Stem 173 is the portion of the drive hub 34 that is formed with the geometric features that facilitate the coupling of the hub to the motor output shaft 30. Located within the base of the bore within stem 173 there is a coil spring 169 with a conical profile. [0058] Extending forward from stem 173, the drive hub 34 has a neck 174 that extends into the proximal end opening of the outer hub 38. In the depicted version of the invention, neck 174 has a diameter less than that of stem 173. A head 176 located forward of the neck 174 forms the distal end of the drive hub 34. Head 176, it will be observed, has a larger diameter than the adjacent neck 174. More specifically, the drive hub 34 is formed so that neck 174 has a diameter less than that of the open section defined by the inner surfaces of coil seal stop tabs 150. In contrast, drive hub head 176 has a diameter that is slightly greater than the opening defined by the coil seal stop tabs 150. For example, in one version of the invention, the neck 174 of the drive hub 34 has an outer diameter of 0.31 inches and head 176 has a diameter of 0.344 inches. In this version of the invention, the open section of the bore defined by the coil seal tabs 150, once the coil seal 139 is seated in the outer hub 38 and slightly compressed, is between 0.33 and 0.34 inches. [0059] A bore 177 extends from the distally directed front face of the drive hub head 176, through the head 176 and partially through neck 174. The proximal end of the drive shaft 40 is secured in the distal portion of bore 177 by any conventional means. The drive hub 34 is further formed to have a suction port 180 on one side of the neck 174 that curves into, and is in fluid communication with, the proximal end of bore 177. Suction port 180 is the opening in the drive hub 34 through which suction is drawn. [0060] The cutting accessory 22 is assembled by inserting the drive shaft 40 through the outer hub 38 and into the outer shell 42. When the cutting accessory 22 is so assembled, the drive hub and drive shaft subassembly are moved past coil seal 139 in hub bore 134. Owing to the dimensioning of the components, the drive coupler head 176 abuts the coil seal stop tabs 150. Owing to the compressibility of the material from which the coil seal 139 is formed, a small amount of force compresses the stop tabs 150 to allow the complete insertion of the drive coupler and rotating shaft. After assembly, if the cutting accessory 22 is held vertically, the drive hub head 176 will drop so as to abut stop tabs 150. Thus, the stop tabs 150 prevent gravity, without any additional force, from causing the drive hub 34 and drive shaft 40 to drop out of outer hub 38. [0061] In the depicted version of the invention, a washer 183 is shown surrounding the portion of the drive shaft 40 located immediately forward of the drive hub 34. Washer 183 is thus sandwiched between the distally-directed face of the drive hub 34, and the adjacent proximally directed recessed face of the outer hub 38. Washer 183 is provided with some cutting accessories 22, such as burs, as both a spacer and to reduce the friction contact between the drive and outer hubs 34 and 38, respectively. [0062] The cutting accessory 22 is secured to the handpiece 20 by inserting the drive and outer hubs 34 and 38, respectively, into the open end of collet bore 26. The outer hub ears 135 are inserted in collet slots 86. As the outer hub 34 is seated in opening 26, the arcuate side surface 137 of the ear 135 adjacent the locking ring lip 104 presses against the lip. Owing to the complementary tapers of lip 104 and the adjacent ear 135, the movement overcomes the force of wave spring 66 that urges that lip into the portion of groove 84 that intersects the contiguous slot 86. Thus, the lip 104, and the adjoining arcuate section of the locking ring 62 are pressed into collet groove 84 so that the ear 135 can pass over the lip. [0063] Once the outer hub ear 135 passes over the locking ring lip 104, the wave spring 66 urges the lip back into the position in which the lip is within the portion of groove 84 that intersects the contiguous slot 86. When the locking ring 62 is so seated, lip 104 abuts the distally-directed face 138 of the ear 135 to hold the outer hub 38 and the whole of the cutting accessory 22 to the handpiece 20. When the coupling assembly 32 is in this state, the assembly is considered in the locked state. [0064] While not part of this invention, it should be understood that, owing to the geometry of the proximal end of the drive hub 34, the seating of the cutting accessory 22 in opening 26 causes the drive hub 34 to engage the motor output shaft 30. When the drive hub 34 is so seated, the narrow diameter end of spring 169 presses against the distal facing face of the motor output shaft 37. Spring 169 thus pushes the drive hub 34 forward. [0065] When the cutting accessory 22 is fitted in the handpiece opening 26, ribs 154 and 156 abut the tapered inner wall section 96 of collet base 70. Ribs 154 and 156 thus function as a seal that prevents leakage from the suction channel to the outside environment. [0066] As a result of the coupling of the cutting accessory 22 to the handpiece 20, accessory coil 172 is disposed in the space surrounded by handpiece coil 110. The coils 110 and 172 are thus in close enough proximity to each other so that there is inductive coupling of signals between the coils. [0067] During the course of a surgical procedure, a surgeon may want to replace the cutting accessory 22 attached to the handpiece 20 with a different cutting accessory. The installed cutting accessory is removed by the downward depression of the release button 106. This action causes a like downward movement of the locking ring 62 so that lip 104 retracts into the portion of groove 84 below the contiguous slot 86. As a result of this motion, lip 104 moves clear of the adjacent outer hub ear 135. Once the locking ring 62 is so positioned, the coupling assembly 32 is referred to as being in the release state. The transition of the coupling assembly 32 to the release state allows the spring 169, which is previously compressed, to expand. Since the distal end of the spring 169 is disposed against the drive hub 34, the spring pushes the drive hub 34, and therefore the outer hub 38, a short distance forward of the open end of bore 26. Consequently, it becomes a simple task to manually pull the cutting accessory 22 from the handpiece 20. [0068] Once the cutting accessory 22 is extracted from the bore 26 so that the outer hub ear 135 clears the locking ring 62, the pressure on the handpiece can be released without adversely effecting the removal of the cutting accessory. The replacement cutting accessory 22 is then inserted into the handpiece 20. As with the insertion of the first cutting accessory 22, there is no need for the medical personnel to depress the release button 106 in order to secure the new accessory to the handpiece 20. [0069] The coupling assembly 32 of this invention is constructed out of just a few components. Only two of the components, the locking ring 62 and the wave spring 66, move. Thus, given the relatively small number of components incorporated into this coupling assembly, and the fact that only two of the components move, it is relatively economic both to provide the parts of this assembly and to put them together to manufacture the completed assembly. [0070] The coupling assembly 32 of this invention is further constructed so that it does not have to be placed into the release mode in order for the assembly to lock a cutting accessory 22 to the handpiece 20 with which the assembly is integral. Collectively, the handpiece 20 and complementary cutting accessory 22 are arranged so that either of the outer hub ears 135 can seat in either of the collet slots 86. Thus, during the process of fitting the cutting accessory 22 to the handpiece 20, the accessory does not need to be rotated more than 180� before the accessory is properly aligned to be inserted into the handpiece opening 26. Both of these features of the invention make it possible for surgical personnel to rapidly fit a cutting accessory to the handpiece with relatively little manipulation or concentration. [0071] Also, the collet 60 of the described version of the invention is formed from plastic. Thus, since the collet 60 is non-metallic, the collet can readily serve as a housing for coil 110 and not adversely affect the inductive signal transfer between coils 110 and 112. Also, the material from which the collet 60 is formed is lighter in weight than the aluminum from which the handpiece housing 24 is formed. Thus, by providing a plastic collet, the overall weight of the coupling assembly, and the handpiece 20 to which it is installed, is minimized. The minimization of handpiece weight serves to lessen the fatigue to which a surgeon is exposed as a result of having to hold and manipulate the handpiece for an extended period of time. [0072] Still another feature of this invention is that the inner wall section 96 of collet 60, the surface of the collet against which ribs 154 and 156 abut, is curved. Consequently, as soon as there is forward movement of the drive hub 34 out of bore 26, the surface contact between the ribs 154 and 156 and the collet 60 is broken. The breaking of this contact results in a like break in the friction bond that would otherwise hold the ribs 154 and 156 to the collet. The breaking of this bond means that the kinetic force released by the continued expansion of spring 169 is not applied to overcoming friction bond. Instead this spring force serves to urge the hubs 34 and 38 of bore 26. [0073] Another feature of the coupling assembly 32 of this invention is that it houses coil 110. Thus, in a relatively short overall section of the handpiece, in a section usually less than 1.7 inches or less in length and, more particularly, 1.4 or less inches in length, the handpiece of this invention has both a coupling assembly and a coil that is employed to read and write data into a RFID chip 170 fitted in the cutting accessory 22. [0074] Moreover, the locking members that are integral with the cutting accessory 22 of this invention, ears 135, are, from a manufacturing standpoint, relatively easy to provide. It is a relatively simple task to form the ears 135 during the molding of the outer hub 38. [0075] Coil seal 139 of the cutting accessory 22 performs a number of different functions. Specifically, the seal serves as one of the components that protects the RFID chip 170 and coil 172 from the ambient environment. Ribs 154 and 156 of the seal function as a seal around the drive hub 34. This seal ensures that the suction drawn through the handpiece causes fluid flow from the distal end of the drive shaft 40, not the surrounding environment. Stop tabs 150, in combination with the relatively large diameter of the drive hub head 176, cooperate to prevent the drive hub and drive shaft sub assembly from falling out of the outer hub and outer shell subassembly. [0076] An alternative assembly for holding an RFID chip 190 and complementary coil 192 in an outer hub 38 a is now described by reference to FIGS. 13-17. In this version of the invention, the RFID chip 190 and a length of electrical conductor, such as coil 192, are embedded in a substrate or encapsulated in an enclosure to form a transponder or identification module. In the illustrated embodiment of FIG. 13, for example, the chip 190 and coil 192 are sealed within a plastic ring 194. In the present embodiment, the plastic ring 194 is formed from polypropylene which can be sterilized by various methods such as exposure to GAMA radiation or ETO gas. The appropriate size gauge and length of electrical conductor is turned or looped to form the wire coil 192, which is subsequently wrapped in one section of the ring 194. [0077] Various methods can be utilized to produce the above-discussed transponder or identification module. One such method is to insert the chip and coil assembly into a previously molded enclosure and then seal the enclosure. Consider the example of FIG. 14, which is a cross-sectional side view depiction of the plastic ring 194 of FIG. 13. The plastic ring 194 is pre-molded to have an annular base 194A and inner and outer opposed sidewalls, 194B and 194C, respectively, that define an interior channel 195 that initially opens sidewardly to the exterior through an annular opening 194D. The chip 190 and attached coil 192 are inserted into the interior channel 195 through end 194D. The interior channel 195 of the plastic ring 194 is then closed by filling same with liquid resin potting material 194E. Alternatively, channel 195 can be sealed off by filling the channel 195 with a sealant, such as silicone. [0078] Other potential methods of producing the above-discussed transponder or identification module include shellacking, whereby the chip 190 and coil 192 are dipped in a liquid polymer or resin that subsequently hardens, or even possibly by an over-molding or injection-molding process presuming that obstacles, such as potential heat damage to chip 190, can be resolved. [0079] As is with most solid state chips, the RFID chip 190 comprises a collection of solid state circuitry 191A mounted upon a base 191B. Depending on the length of the base 191B, which is determined by the chip manufacturer, chip 190 may be of an inappropriate size to be readily embedded or encapsulated in a shaped substrate or enclosure, such as ring 194, without subjecting the chip 190 to unnecessary stress. [0080] One way to relieve such stress is to adjust the shape of the base 191B to better conform with the shape of the substrate or enclosure that the chip 190 is embedded within. Accordingly, in one embodiment of the present invention, the base 191B of chip 190 is first adjusted before the transponder or identification module is assembled. FIG. 15 illustrates one such example where the base 191B is selectively predisposed with one or more curves or bends 191C in order to relieve stress upon the chip 190. [0081] According to another embodiment, stress in the chip 190 can be reduced or prevented by trimming or shortening the base 191B to a length more appropriate for the size and shape of the substrate or enclosure in which the chip 190 is embedded. FIG. 16 illustrates one such example where the base 191B is trimmed in length to better conform with its ring enclosure 194. [0082] As illustrated in FIG. 17, the plastic ring 194 with embedded RFID chip 190 and coil 192, is slip fitted into outer hub 38 a. Outer hub 38 a has the same general outer surface geometry as first described outer hub 38. Outer hub 38 a is further formed so that there are two circumferentially extending interior walls 196 and 198 internal to the hub base 130 a that define the bore 202 that extends axially through the hub base. The interior wall closest to the hub head 133 a, wall 196, has a diameter that is less then the diameter of the more proximal wall, wall 198. Thus, walls 196 and 198 define a circumferentially extending and inwardly directed step 204 that extends between the respective walls. [0083] The outer hub 38 a and ring 194 are collectively dimensioned so that the ring closely slip fits against interior wall 198. The distal end of the ring 194 seats against step 204. [0084] An annular seal 208 is seated in the proximal open end of hub bore 202 and holds ring 194 in the bore. Seal 208 is formed from the same material from which coil seal 139 is formed. Seal 208 is shaped to have a ring shaped base 210 that is similar in geometry to the proximal end section 146 of seal 139. Thus, seal base 210 is formed to have lock tabs 212 and stop tabs 214 identical in shape and function to the first described lock tabs 148 and stop tabs 150. Extending proximally rearwardly from base 210, seal 208 has a tail section 216 identical in form and function as tail section 152. [0085] Seal 208 is further formed so as to have a set of raised bumps (not illustrated) that extend from the distal facing front ring-shaped face of the seal. The raised bumps are the most forward facing surface features of the seal 208. When the alternative outer hub assembly is assembled, the raised bumps press against the adjacent proximal facing annular surface of ring 194. [0086] When the cutting accessory with RFID chip of this embodiment of the invention is assembled, the plastic ring 194 with embedded chip 190 and coil 192 is slip fitted into outer hub bore 202. The distal end of the ring 194 seats against step 204 formed in the outer hub 38 a. Annular seal 208 is then pressed into hub bore 202. More specifically, the seal 208 is pressed into the bore until lock tabs 212 extend through hub base openings 132 a. The seal 208 thus holds plastic ring 194 in hub bore 202. [0087] In the above-described version of the invention, ring 194 totally encapsulates both RFID chip 190 and coil 192. This encapsulation prevents fluids from contacting the chip 190 or coil 192 and possibly adversely affecting the operation of these components. Another benefit of this encapsulation is that it physically shields the chip 190 and coil 192 from mechanical shock. Thus, the ring 194 can be handled without having to take excessive care to ensure that contact with the ring damages either the chip or coil. [0088] Moreover, ring 194 of the above embodiment, representing one example of a substrate or enclosure into which the RFID chip 190 and coil 192 are embedded, encapsulated or sealed, is a separate component from the outer hub 38 a. This means that when the components of this invention are fabricated, one does not have to engage in the process of attaching or embedding the RFID chip 190 and coil 192 into the hub, which can be a relatively costly process. Instead, the potentially less costly process of embedding, encapsulating or sealing the chip and coil in a separate substrate or enclosure, such as the ring 194, is employed. [0089] Seal 208, does more than function as proximal end seal around the outer hub 38 a and a stop mechanism that prevents the drive hub 34 from falling out of the outer hub. The seal 208 also serves as the member that holds the ring 194 in the outer hub 38 a. Also, it is clear that it is a relatively simple task to fit the seal in the outer hub 38 a and that such mounting does not require the use of an added adhesive. The above features of the foregoing described version of the invention make it relatively easy to provide the cutting accessory of this version of the invention with the RFID chip 190 and coil 192. [0090] Moreover, since the plastic ring 194 protects the RFID chip 190 and coil 192, a number of these assemblies may be physically packed together, to a density where adjacent rings physically abut. As seen by reference to the diagrammatic representation of FIG. 18, this means a large number of chip and coil embedded ring assemblies may be placed at a workstation 220 and simultaneously be loaded with identification data. [0091] As seen by reference to FIG. 19, it should be understood that, upon delivery from the manufacturer, the memory of each RFID chip 190 includes a data field for a serial number 222 and a set of empty data fields represented as fields 224, 225 and 226. The RFID chip 190 and coil 192 are subsequently embedded into a substrate or encapsulated within an enclosure, such as plastic ring 194. [0092] After the chip 190 and its associated coil 192 are sealed within a substrate or enclosure to form a transponder or identification module, they are then subjected to batch programming in accordance with the intended purpose of a particular type of cutting accessory. In the batch programming, at the workstation 220, a single writing device 228 with a single coil 230 simultaneously writes data into fields 224, 225 and 226. Specifically, these data are the data used by the control console to which the handpiece 20 is connected to regulate the actuation of the handpiece motor 28. The data written into fields 224, 225 and 226 indicate such things as: the type of cutting accessory; the initial, preferred minimum and preferred maximum operating speeds of the cutting accessory; authorization codes verified by the control console in order to determine whether or not it is appropriate to actuate the motor; a suggested operating lifetime for the cutting accessory; the type of cutting accessory; and the batch lot in which the cutting accessory was manufactured. [0093] The above data are identical for each cutting accessory manufactured in a single batch lot. Therefore, these data can be simultaneously written into the RFID chips 190 for each chip within the lot. This eliminates the more time consuming task of having to write the data individually into each chip. Since each chip already has a data field 222 in which a unique identification number is stored, this identification number can be used as the unique identification number for the cutting accessory 22. [0094] It should be recognized that the foregoing are descriptions of two preferred versions of the invention and that other versions of the invention may vary from what has been described. For example, while generally the surgical handpiece 20 is discussed in conjunction with a cutting accessory 22, it should be understood that the transponder or identification module of the present invention may be readily utilized in other types of surgical handpiece accessories, such as, for example, heat-generating devices, light generating devices and sound/mechanical-vibration generating devices. In addition, while the surgical handpiece 20 and accessory 22 are discussed in the above embodiments in relation to endoscopic surgery, use of the invention is not so limited. The components of the system of this invention can also be employed to perform other types of surgical procedures. Handpieces and cutting accessories of this invention may, for example, be designed to perform ENT procedures, spinal procedures and neurological procedures. [0095] Also, some versions of the invention may not include all features of the described version of the invention. For example, some systems of this invention may not have the coils that are employed to facilitate inductive signal transfer between the handpiece and complementary cutting accessory. In some of these versions of the invention, it may therefore not be necessary to provide the collet as a component separate from the handpiece housing. In these versions of the invention, the locking ring, the wave spring and the cover plate are fitted directly onto the handpiece housing or body. An advantage of this arrangement of the invention is that it even further reduces the number of components that need to be provided in order to construct the handpiece of this invention. [0096] Similarly, there may be reasons to provide a tool system of this invention with some or all of the features of the coil seal but not to employ the specifically disclosed means for releasably holding the outer hub to the handpiece. Thus, an alternative version of the invention may comprise an elastomeric member attached to the proximal end of the outer hub that includes one or more of the described ribs. This version of the invention may be constructed if the cutting accessory is not provided with an RFID chip. In these versions of the invention, the ribs of these members perform the sealing function of described ribs 154 and 156. In these versions of the invention, the outer hub may be provided with surface features different from the described ears to facilitate the releasable attachment of the cutting accessory to the handpiece. [0097] With regard to the ribs 154 and 156, it should similarly be recognized that their number are exemplary, not limiting. Some versions of the invention may be provided with a single rib, some versions three or more ribs. Also, in the described version of the invention the rib 156 is seated is of smaller outer diameter than rib 154. This is because the section of the inner wall of the housing against which rib 156 abuts is of smaller diameter than the section against which rib 154 abuts. In alternative versions of the invention, the diameters of these ribs may vary to compensate for like differences in the profiles of the surfaces the ribs are intended to abut. [0098] Further, it should be recognized that the location of the coil seal lock tabs 148 and the complementary outer hub openings 132 in which the lock tabs are seated may be different from what has been described. Thus, the lock tabs may be integral with the distal end section 140 of the seal. Also, both the end sections of the seal may, in some versions of the invention, be provided with lock tabs. In these versions of the invention it should be understood that the outer hub is formed with longitudinally spaced openings in which the lock tabs are seated. [0099] In some versions of the invention, it may not even be necessary to provide the lock tabs and complementary outer hub openings in which the lock tabs are seated. In some versions of the invention, it may be possible to provide a seal that is simply compression and/or friction secured into the outer hub bore. In still other versions of the invention, an adhesive may be supplied to bond the seal in the outer hub bore. [0100] It should similarly be recognized that the geometry and number of the stop tabs 150 may vary from what has been described. For example, in some versions of the invention, instead of providing two tabs, the stop member may be a ring formed of flexible material. The ring thus defines an open section of the outer hub base proximal end opening that has a diameter greater than that of drive hub neck 174 and less than that of the drive hub head 176. This ring may or may not be provided with slots to facilitate its flexing in order to allow the insertion of the drive hub head into the outer hub proximal end opening. Alternatively, three or more tabs formed of flexible, compressible, or otherwise yielding material, may be provided as stop tabs. [0101] Also, the number of ears 135 integral with the cutting accessory outer hub 38 may be different from what has been described. In some versions of the invention, it may be desirable to provide a single ear 135. This version of the invention may be provided when there is a need to position the cutting accessory in a specific rotational orientation relative to the handpiece 20. In other versions of the invention, it may be desirable to provide the cutting accessory with three or more ears. In these versions of the invention, the collet and locking ring are appropriately shaped to accommodate the seating of the ears that do not abut the lock ring. An advantage of these versions of the invention is that they further reduce the extent to which the cutting accessory 22 needs to be rotated in order to position one ear in the slot 86 where the locking ring will then block the movement of the ear. This also increases the extent to which the rotational orientation of the cutting accessory 22 relative to the handpiece 20 can be selectively set. [0102] Similarly, it should be understood that the components of the versions of the cutting accessory described in detail may be intermixed as may be appropriate. For example, in some versions of the invention, it may be desirable to embed the RFID chip 190 and coil 192 in ring 194 and place this accessory identification between the inner wall of the outer hub and adjacent outer wall of a seal similar to seal 139. Alternatively, it may prove economical to apply a coating of material over the chip-coil-and-flex circuit accessory identification assembly of FIG. 10. Then, this assembly is held in place by seal 208. [0103] In some versions of the invention, it may be possible to provide the accessory identification assembly with a C-shaped member that encases the RFID chip and complementary coil. In these versions of the invention, the coil would not extend completely circumferentially around the outer hub. In these versions of the invention, the C-shaped member would have an outer diameter that is greater than that of the adjacent inner wall of the outer hub. Then, upon the insertion of the accessory identification assembly into the outer hub bore, the C-shaped member would compression secure itself against the inner wall of the outer hub. In these versions of the invention, in order to ensure that the C-shape member is held in place, the outer hub may be formed with an annular groove in which the C-shaped member is seated. [0104] Also, alternative constructions of the coupling assembly may be possible. For example, in some versions of the invention, the wave spring and release button may be on opposite sides of the locking ring. In these versions of the invention, the lip portion of the locking ring, the portion that blocks movement of the outer hub 38 is located adjacent the wave spring. The spring biases the locking ring so that the lip is normally in the locked state. The release button is depressed to retract the lip into an adjacent slot in the collet so as to place the locking ring in the release state. [0105] Similarly, the biasing member that holds the locking ring in the locked state may have different forms than what has been described. For example, not all spring versions of this biasing member need be wave springs. In some versions of the invention, a coil spring or leaf spring may perform this function. Also, this biasing member need not always be a metal or plastic spring. In alternative versions of the invention, elastomeric material disposed between a static component integral with the handpiece housing and the locking ring may serve as the member that releasably holds the locking ring in the locked state. [0106] It should likewise be understood that the geometry of the components of this invention may vary from what has been described. For example, there is no requirement that the accessory outer hub and complementary handpiece opening in which the hub is inserted always have a circular profile. In other versions of the invention, it may be desirable that these components have an oval profile or in the form of a polygon, for example, a square or pentagonal shape. Similarly, the ears of the outer hub, which function as its lock tabs, may have a geometry different from what has been described. For example, there may be a reason to provide the longitudinally extending surfaces of these components with linear profiles. Clearly, other hubs of the cutting accessory of this invention may have other geometric features to facilitate the locking of the hub to the complementary handpiece. [0107] Also, it should be recognized that not all versions of this invention incorporate a motor as the power generating unit. In some versions of the invention, the power generating unit may consist of a device that generates ultrasonic energy, RF energy, thermal energy or photonic, light, energy. In these versions of the invention, the coupling member that transfers the power generated by the power generating unit to the cutting accessory will be different from what has been described. The coupling member may also be different if the power generating unit is the previously described motor 28. For example, sometimes the motor output shaft 30 may not be provided with a drive pin. In these versions of the invention, teeth integral with the output shaft function as the coupling member and engage with complementary teeth on the accessory drive hub to transfer the motive power from the motor to the cutting accessory. [0108] Therefore, it is an object of the appended claims to cover all such variations and modifications as come within the true spirit and scope of this invention. 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NewkirkIntelligent electrosurgical electrode and tracking systemUS20140031831 *Aug 30, 2013Jan 30, 2014Stryker CorporationSurgical tool system including a navigation unit that receives information about implant the system is to implant and that responds to the received informationCN101282699BAug 25, 2006Oct 27, 2010卡尔蔡司医疗技术股份公司Contact glass for ophthalmic surgeryEP1834597A1 *Mar 9, 2006Sep 19, 2007BrainLAB AGSurgical instrument comprising load feedbackEP1872822A1 *Jun 28, 2006Jan 2, 2008MediUm-TECH Medizinger�te GmbHApparatus for repetitive skin piercing with a handheld device, needle module and assembly method of the deviceEP1872823A1 *Jun 27, 2007Jan 2, 2008MediUm-TECH Medizinger�te GmbHAssembly for repeated punctuation of skin with a hand device, needle module and method for mounting the hand deviceEP1943954A2 *Jan 9, 2008Jul 16, 2008Ethicon Endo-Surgery, Inc.Post-sterilization programming of surgical instrumentsEP2821025A1 *Feb 11, 2010Jan 7, 2015Haldor Advanced Technologies L.T.D.Apparatus for identifying & tracking multiple tools and disposablesWO2006066035A2Dec 14, 2005Jun 22, 2006Alcon IncSystem and method for identifying and controlling ophthalmic surgical devices and componentsWO2006119197A1 *Apr 28, 2006Nov 9, 2006Ethicon Endo Surgery IncButton latching system for a trocarWO2007022993A2 *Aug 25, 2006Mar 1, 2007Zeiss Carl Meditec AgContact glass for ophthalmic surgeryWO2007090026A1 *Jan 25, 2007Aug 9, 2007Warsaw Orthopedic IncSurgical instrument tray rfid tagWO2009138324A1Apr 29, 2009Nov 19, 2009Aesculap AgSurgical drive unit, surgical instrument, and surgical drive systemWO2010098809A2Jan 25, 2010Sep 2, 2010Stryker CorporationSurgical tool arrangement having a handpiece usable with multiple surgical toolsWO2011141912A1 *May 11, 2011Nov 17, 2011HALDOR Advanced Technologies L.T.DDevice and method for attaching a tag to a toolWO2013009252A2 *Jul 9, 2012Jan 17, 2013Medical Vision Research & Development AbStatus control for electrically powered surgical tool systemsWO2015006876A1 *Jul 14, 2014Jan 22, 2015Startech Engineering AgCoupling device for medical instrument or medical power-tool chuckWO2015112938A1 *Jan 26, 2015Jul 30, 2015Smith & Nephew, Inc.Surgical drive apparatus* Cited by examinerClassifications U.S. Classification606/170, 606/167International ClassificationA61B17/32, A61B17/00, A61B19/00Cooperative ClassificationA61B2017/00482, A61B2017/00477, A61B2019/448, A61B17/32002European ClassificationA61B17/32E2Legal EventsDateCodeEventDescriptionJul 6, 2004ASAssignmentOwner name: STRYKER CORPORATION, MICHIGANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DENG, WENJIE;KAUKER, BARRY J.;REEL/FRAME:015533/0422Effective date: 20040325Jul 16, 2014FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services


text:
Milwaukee Bucks vs Indiana Pacers - Recap
Pacers top Bucks for fifth win in last sixIndiana Pacers Milwaukee Bucks3385dAnthony Johnson scored 24 points and Peja
Stojakovic had 16 of his 20 in the second half as the Pacers beat the Bucks 88-77 on Wednesday night.
+ Irving (knee) sits Cavs' Game 3 win over Hawks+ 2015 NBA playoffs: Conference finals coverage+ Optimistic Hawk Bazemore to start for KorverPlay0:46Horford receives flagrant foul 2, ejected vs. CavsAtlanta Hawks54mKevin ArnovitzThe Atlanta Hawks' Al Horford was ejected after receiving a flagrant 2 foul after bringing his arm down on a falling Matthew Dellavedova late in the first half.
Kevin C. Cox/Getty ImagesIrving (knee) sits Cavs' Game 3 win over HawksCleveland Cavaliers50mDave McMenaminKyrie Irving missed the Cavaliers' 114-111 overtime win in Game 3 of the Eastern Conference finals series against the Hawks with tendinitis in his left knee.
Pacers top Bucks for fifth win in last six2/15/2006 - Indiana Pacers Milwaukee Bucks0 SharesEmailComment MIL
0 SharesEmailCommentINDIANAPOLIS (AP) -- The Indiana Pacers were happy to enter the
All-Star break with a victory.The Pacers shot 41 percent and committed 20 turnovers, but
earned an 88-77 victory on Wednesday night.Anthony Johnson scored 24 points and Peja Stojakovic had 16 of
his 20 in the second half for Indiana."It seemed like we were playing in quicksand, turning the ball
over," Johnson said. "They really didn't have much energy,
either. It was just two teams playing with no energy, but we found
a way in the second half to get a big lead and create some distance
and get a much needed win."The Pacers led 40-39 at the end of a sloppy first half. The
teams combined for 22 turnovers and both shot 40 percent in the
first two quarters.David Harrison had 16 points and six rebounds and Jeff Foster
grabbed 18 boards for the Pacers. Indiana has won five of its last
six games heading into the break.Michael Redd led Milwaukee with 24 points, but he shot 10-for-26
from the field. Bobby Simmons scored 19 points and Jamaal Magloire
added 11 points and 15 rebounds for the Bucks.The Pacers led 76-70 in the fourth quarter before a 6-0 run,
highlighted by a 3-pointer and a dunk by Stojakovic, put the game
out of reach.It was a disappointing loss for the Bucks, which had played four
games in five days. Milwaukee played the night before, beating
Seattle 106-91. The rested Pacers hadn't played since Sunday's
92-88 loss to San Antonio."I really don't think we gave our best effort tonight, being
the second of a back-to-back," said Milwaukee guard T.J. Ford, who
is recovering from a mid-back contusion. "But with the All-Star
break here, we've got some time to heal."Indiana didn't make a 3-pointer in the first half, but hit five
in the second. The Pacers outrebounded the Bucks 52-39 and held
them to 37 percent shooting.Pacers guard Stephen Jackson was poked on the eye on a drive to
the basket in the second quarter and went straight to the locker
room. He returned to start the third quarter.Indiana held a 40-39 lead at halftime. The Pacers' top two
scorers, Jackson and Stojakovic, were only a combined 3-for-13 in
the first half.The Pacers started to get their offense going in the third
quarter when Stojakovic got going. He hit two quick 3-pointers to
give Indiana a 54-47 lead and force a Milwaukee timeout.Simmons scored six points in a Milwaukee run that cut Indiana's
lead to 60-58. The Pacers responded by scoring the last seven
points of the quarter, including a 3-pointer by Johnson at the
buzzer that gave Indiana a 67-58 lead heading into the fourth.Johnson has been more assertive as a scorer lately. He scored 23
points in a 107-95 win over Golden State on Feb. 10."It's always nice to get some attempts," he said. "I feel my
offensive game is coming around. I feel good about taking shots and
guys are looking for me."The win was significant for Indiana because for most of the
season, the Pacers have had to play well to win. Johnson saw the
positive in being able to win, especially while missing injured
starters Jermaine O'Neal, Jamaal Tinsley and Austin Croshere."I know our margin for error was small, but our defense has
been unbelievable in the past two weeks. We've just been getting
stops, we've been holding teams below 90 points. Any time you do
that, you have a chance."Game notes
The Bucks were called for defensive three seconds twice in
the second half. ... The Bucks are 4-0 home this month and 0-4 on
the road. ... Harrison entered the game shooting 38 percent from
the free-throw line, but was 6-for-9 against the Bucks. ... Indiana
shot 19-for-29 from the free-throw line. ... The Pacers are 5-2
since acquiring Stojakovic from the Sacramento Kings.

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