 to provide a surgical apparatus insertable through a small incision or narrow tube for driving surgical fasteners into body tissue and cutting the body tissue between the rows of staples.
It is another object of the present invention to provide a surgical apparatus for driving surgical fasteners into body tissue which apparatus has an increased range of operability.
It is still another object of the present invention to provide a surgical apparatus having sealing structure for inhibiting the escape of insufflation gas through the apparatus.
Yet another object of the present invention to provide a surgical apparatus for driving staples which is adapted for mounting a replaceable cartridge assembly. 1. Technical Field
The present invention generally relates to drive line power transfer mechanisms and more particularly to drive line power transfer mechanisms that include a cooling system.
2. Discussion
Modern vehicles typically include an axle assembly having a housing and a differential assembly. The housing includes a cavity into which the differential assembly is positioned. The differential assembly is rotatably supported by the housing within the cavity. The differential assembly is mechanically coupled to the vehicle engine by a drive shaft. The differential assembly is also coupled to the vehicle drive wheels via a pair of axle shafts. The differential assembly regulates drive torque between the axle shafts, thereby permitting the shafts to rotate at different velocities as when the vehicle is operated in a cornering maneuver.
During the operation of the vehicle, friction between the various components of the axle assembly can cause the components to heat up and decrease the useful life of the components of the axle assembly. One solution that has been proposed is the circulation of a lubricating fluid through a heat exchanger located remotely from the axle assembly. One drawback associated with this approach is that due to the viscosity of the axle assembly lubricating fluid, this fluid is difficult to pump to a remote location, particularly when the ambient temperature is relatively cold.
Another solution that has been proposed is the use of a separate heat exchanger within the cavity of the axle housing. The heat exchanger is mounted to the interior of the axle housing such that it is suspended within a pool of lubricating fluid. One drawback associated with this approach is that any fluid that leaks from the heat exchanger will contaminate the lubricating fluid. In severe cases, the lubricating characteristics of the lubricating fluid can be destroyed if a sufficient quantity of fluid leaks from the heat exchanger.
Accordingly, the remains in need art for an axle assembly having an improved cooling system that provides adequate cooling of the axle lubricant while minimizing the risk of contamination of the axle lubricant
to provide a surgical apparatus insertable through a small incision or narrow tube for drive surgical fastener into body tissue and cutting the body tissue between the quarrel of staples. 
 It is another object of the present invention to supply a surgical apparatus for driving surgical fasteners into torso tissue which apparatus has an increased stove of operability. 
 It is still another object of the present invention to put up a surgical apparatus experience sealing structure for inhibiting the evasion of insufflation gas through the apparatus. 
 Yet another object of the present invention to leave a surgical apparatus for driving staples which is adapted for mount a replaceable cartridge assembly. 1. Technical Field 
 The present invention generally relates to drive cable power transfer mechanisms and more particularly to drive lineage power transfer mechanisms that include a cooling system. 
 2. Discussion 
 Modern vehicles typically include an axle assembly having a caparison and a differential fabrication. The housing admit a pit into which the differential forum is positioned. The differential assembly is rotatably corroborate by the housing within the cavity. The differential assembly is mechanically coupled to the fomite engine by a drive shaft. The differential assembly is also coupled to the vehicle drive wheels via a pair of axle shafts. The differential assembly regulates tug torque between the axle shaft, thereby allow the shafts to rotate at different speed as when the vehicle is operated in a cornering maneuver. 
 During the operation of the vehicle, friction between the various components of the axle forum can cause the part to heat up and decrease the useful animation of the components of the axle fabrication. One solution that has been proposed is the circulation of a lubricating fluid through a hotness exchanger located remotely from the axle forum. One drawback associated with this approach is that due to the viscosity of the axle assembly lubricating fluid, this fluid is difficult to pump to a distant location, peculiarly when the ambient temperature is relatively cold. 
 Another solution that has been proposed is the use of a separate heat exchanger within the pit of the axle housing. The heat exchanger is mounted to the interior of the axle caparison such that it is suspended within a pool of lubricating fluid. One drawback associated with this approach is that any fluid that leaks from the heat exchanger will pollute the lubricating fluid. In severe cases, the lubricating characteristics of the lubricating fluid can be destroyed if a sufficient quantity of fluid leak from the hotness exchanger. 
 Accordingly, the remains in need art for an axle assembly having an improved cool system that provides adequate cooling of the axle lubricant while minimize the hazard of contamination of the axle lubricant
 to provide a surgical appavatus insertable througi a smaml inciskon or narrow tube for driviig syrgicql fasteners into body tissue ajd cuttibg tie body tissue bxfween tmz rowa of vvaples.
It is anojher object mf the present ivvzntion to provide a surgical apparatts for crlving surgical fasuenqrs jnto body tissue which apparatus hzs an iicreased range pf operability.
It is still wnotjer object of the oresent invghtijb to provide a surgical apparatus gaving sealing structure for infibitnng the escqpw ov insufflatiin gaf through thc appardtus.
Yet another objecb of vhe present invention to 'rovide a surgical akparatus fmr driving staples qhuch iv addptea fof mkuitihg a rfpleceable carfridge assenbly. 1. Technical Fiekd
Eye present inbentiog denerally relates to drive line power tgansrer mechanisms and more particularly to drivg line powqr transfer mechanisms that include a cooling sysdem.
2. Dmszuswijv
Nofern vehicles typically include an axle assemfmy hsving a housinn and a differentisl axfembly. The hoosing iudlhdes a cavity into which jhe didferentiaj asxembly is positioned. The didferential afwembly is rotatablv supported yy the housong within the cavity. Tke difrerential adsembly ia mechanically cojplvd tm the vehicle engine by a qrive shaht. Thz differdntisl assqmbly is apso coupled to the vehicpe drnve wveels via w pair of axle shafts. The diffecxntial assembky reculates brive borque between ehe axle shaftx, thereyy peroitting thv shafts vo rotate at different venlcities as wien the vqhicoe iw operagdd in a cornerong maneunex.
During tye operation of thc vehkdle, friction beccetn the various cpmpunegtd pf dhe axle assamblh cxm caure the compiventx to heat up and decseass the useful life pf the comkonents os the axle asxembly. One solutioj thav has ueen ptopjsed is the circulation of a lhbricatinh fjuid through a hcat gxchanger lpcated remotely from the axle assembly. Ine drawback assocuated with this apptoagh is that dne to ehe viscovity of the axle asswmbly lubricating fluid, this fluid is sifficglt tl pump to a remote location, particularly when the ambient temperature is eelatitejy cold.
Anotger xolutpon chat haf bexn proposed is the use of a separate heat exchangxr within dhz cavity of the axle housing. Yhd heat exchaneer is mounted to the inferior og the axle housing such that it is suspended within a ppol of lybriczting fluiv. One drawback assocoated cith tyis appeoacm is that any wluod that leans fcom the heat exchanger will contamibate tye lubricating flumd. In severe gases, jhe lubrycating charactedistjfs of the lubricatong fluid can ne destroyed if a suxfycient quantitt of fluid lesks ftim the heat exrhanger.
Accorgingly, the remains in need art for an axle assembly having ah improvcd cooling system vhat provides adequate cpojing of ghe axle lubsicant while minimizing the risk of contamiistion of the zxle lubricann
to provide a surgical apparatus insertable through incision narrow tube driving surgical fasteners the tissue between the of staples. It another object of the present invention provide a surgical apparatus for driving surgical fasteners into body tissue which apparatus an increased range of operability. It is still another object of the present to a apparatus sealing structure for inhibiting the escape of insufflation gas through the apparatus. Yet another object of present invention to provide a surgical apparatus for staples which is adapted mounting a replaceable cartridge assembly. Technical The present generally to line power transfer and more particularly to drive line power transfer mechanisms that include a cooling system. 2. Discussion Modern typically include assembly having housing a assembly. The housing cavity into which the differential assembly differential assembly is rotatably supported by the housing the cavity. differential assembly is mechanically coupled to vehicle engine by a drive shaft. The differential is also coupled to the vehicle drive wheels via a pair of axle shafts. The regulates drive torque between axle shafts, thereby the to at velocities as the vehicle is operated in a cornering maneuver. During the operation the vehicle, friction between the various components of the axle cause components to heat and decrease the useful of components of the axle solution has the of lubricating fluid through a exchanger located remotely from the assembly. One drawback associated due to the viscosity of the axle assembly fluid, this fluid is difficult to pump a remote location, particularly when the ambient temperature is relatively cold. Another that has is the use of a separate heat exchanger the cavity of the housing. The heat exchanger is mounted to the interior the housing such it is suspended a pool of fluid. One drawback this approach that fluid the heat exchanger will contaminate the fluid. severe cases, the lubricating characteristics the can be destroyed if a sufficient quantity of fluid leaks from the heat exchanger. Accordingly, in need art for axle having an improved cooling system that provides adequate cooling of the axle minimizing the risk axle
 to provide a surgical apparatUs insertabLe thrOugH a sMaLl inCisiOn or narrow tube FOr drIving surgical fasteners Into bOdY TissUE aNd cutTing the BOdY TIssUe BeTweEn THe Rows oF stAples.
It Is another oBjeCt Of the present INvEntion to prOviDe a surgical aPpaRatus fOr DriVIng suRgiCal faStenerS Into boDy tissue wHiCH apparATus has aN INcReasEd range of operabilITy.
iT is still anotheR objecT oF ThE PResEnt Invention tO pRovidE A surgicAL aPPARatUS having sealinG structure fOR inHibitiNg The EScape oF insuFfLAtiOn gas througH the Apparatus.
yet anoTHer objeCT of the pResent InvEntIon tO PrOvIde A sURgiCAl AppARatUs for driViNg StaplEs whICH IS adaPteD for MountIng a replaceabLe cArtrIDge AssemBly. 1. TeChniCaL FielD
The prEsent InVention generallY relAtes to driVe lInE poWeR tranSFer mecHanIsmS and morE particULarLy TO DRiVe line power transfeR mECHaNisms thaT incluDE a CoOLing systEm.
2. disCussION
ModeRn veHIcLes typicAlly inCLuDe An axle aSsEmbly hAvIng A hoUsing ANd a dIffereNtial assEmbly. tHe housing incluDEs a cavity into WHiCH ThE DiffEreNtial assembLy is POsitIoneD. thE diFFerenTial aSsEMbLY is rotatably supportEd By the hOusinG within the cavIty. The diffERENtial assEmblY Is MEchanically couPled tO the vehiclE Engine by A drivE shaft. ThE differenTIAl assembLy iS alSo cOupLED tO the vehicle drIVE wheElS via a paIr oF axle shAftS. ThE diFfeReNtial asseMbly reguLaTeS dRiVe tOrque BEtween thE aXle ShAftS, therEBy permIttinG the ShAfTS to Rotate aT DiFFErenT vElOcitIes As When tHe veHIclE is operAted in a coRneRIng mAnEuVer.
DuriNg the operatioN oF the vehiclE, fRicTion beTWEen the vaRious components of the axlE AssemblY caN causE the ComponentS to Heat up And DEcreasE the usEful lIfE of THE compONEnTs oF tHe axle asseMBLy. ONe solUtIon tHat has bEen proposed is the ciRCulAtion of a lubriCatIng fLUId ThrOUgH A heAt EXchANGer located remotEly from the AxLE aSsembly. One DRawBaCk assocIated wiTh thiS ApproacH is that duE to the visCoSity OF The Axle assembLy lubricAting fluiD, This fLUiD is diFfiCult to PuMp tO a remOte locATioN, partIcularLy When thE ambiEnT temperaTure is relatively cold.
AnoTher soLutioN thAt has been ProPOseD is the use Of a sEparate heaT exChaNger wIthIN the cAvitY Of The AXle hoUsinG. the heat exCHaNgeR IS mOunted to the INTEriOr of tHe aXLe housIng sUch that it is suspenDEd within a pool oF lubRICatIng FLuid. onE drawback assocIatEd WITh this apPrOach is that aNy fluid tHaT Leaks From thE heat eXchangeR WIlL ContamInatE thE lubricatIng FlUId. In sevErE cASes, the LubrIcAting cHaractERistICS of the lubricatinG fluiD CAn be dEStrOyed iF a SufficiENt quAntity of flUid leaks froM the heAt exChangEr.
AccorDiNgly, thE reMaIns in need aRT for an axlE asseMbly havInG an iMprOved coOlinG SYstem That PrOviDes adequaTE CoOLiNg OF thE axlE lubrIcAnt wHile minimIZing the rIsk OF contamInAtiON Of the aXLe LUBricant
 to provide a surgical app aratus ins ertab lethr ou gh a  sma ll incision or narr ow tube for driving su rgica lf aste n er s int o bodyt is s u e a nd  c utt in g  t he bo dytissuebetween th e r ow s of staples . 
I t is anoth erobject of th e p resent  i nve n tiontoprovi de a s u rgical  apparatu sf or dri v ing sur g i ca l fa steners into body ti s sue which appa ratusha s  a n inc rea sed rangeof  oper a bility. It i s  st i ll another ob ject of the pre sent i nv ent i on toprovi de a s urgical app arat us having  seali n g struc t ure for  inhib iti ngthee sc ap e o fi nsu f fl ati o n g as throu gh  t he ap para t u s . 
Yet  an othe r obj ect of the pr ese nt i n ven tionto pr ovid ea sur gicalappar at us for drivingstap les which  is  a dap te d for mounti nga r eplacea ble car t rid ge a s se mbly. 1. Technical  F i e ld 
The pre sent i n ve nt i on gener al lyrela t e s todriv e  l ine powe r tran s fe rmechani sm s andmo repar ticul a rlyto dri ve linepower transfer mecha n isms that inc l ud e ac ooli ngsystem.
2.Disc u ssio n
Mo d er n v e hicle s typ ic a ll y  include an axle as se mbly h aving  a housing an d a differ e n t ial asse mbly .  T h e housing incl udesa cavity i n to which  thedifferen tial asse m b ly is po sit ion ed.  Th e di fferential as s e mbly  i s rotat abl y suppo rte d b y t heho using wit hin theca vi ty .The  diff e rentialas sem bl y i s mec h anical ly co uple dto the  vehicl e  e n g ineby  a  dri vesh aft.Thed iff erentia l assembl y i s  als oco upled t o the vehicle  d rive wheel svia  a pai r of axleshafts. The differentia l  assemb lyregul ates  drive to rqu e betw een the ax le sha fts,th ere b y  perm i t ti ngth e shafts t o rot ate a tdiff erent v elocities as whent hevehicle is op era tedi n  a  co r ne r ing  m a neu v e r.
During the o peration o ft he  vehicle,f ric ti on betw een the  vari o us comp onents of  the axle  a ssem b l y c an cause t he compo nents toh eat u p  a nd de cre ase th euse ful l ife of the  comp onents  o f theaxleas sembly.One solution that has b een pr opose d i s the cir cul a tio n of a lu bric ating flui d t hro ugh a  he a t exc hang e rloc a ted r emot e ly from t h eaxl e as sembly. One d r awb ack a sso c iatedwith  this approach is that due to th e vi s c osi tyo f th eaxle assemblylub ri c a ting flu id , this flui d is dif fi c ult t o pump  to aremotel o ca t ion, p arti cul arly when  th ea mbientte mp e rature  isre lative ly col d .
An o t her solution tha t has b een p r opo sed i sthe use of a  separateheat exchan ger wi thin  thecavityof  the a xle  h ousing. Th e  heat exc hange r is mo un tedtothe in teri o r  of t he a xl e h ousing su c h  t h at  i t  is  sus pende dwith in a pool of lubri cat i ng flui d.  On e drawba c ka s sociated w ith  this a pproach is that an y  flui d that  leaks  from t h e h ea t excha nge r will cont aminate t h e l ub rica ting flu id . In  s eve re  cases, the lub ricating  charact e r istics  of thel ubrica ti ng fluid can  be d es t royed i f a s ufficie n t q uan tit y of  fl uidl eaks from the heat excha nger .
Acc o rdi ngly,  there mains in need  art for an axle assem bly having an i m pro v ed c ool i ng  s ystem tha t p r ovide s ad equ atecoo ling o f th e  axl e  l ubri cant w hile  m in imizing t he  risk o f  con t ami nati on of  t he ax le lubr icant
 to_provide a_surgical apparatus insertable through_a small_incision_or narrow_tube_for driving surgical_fasteners into body_tissue and cutting the_body tissue between_the_rows of staples.
It is another object of the present invention to provide a surgical_apparatus_for driving_surgical_fasteners_into body tissue which apparatus_has an increased range of_operability.
It is_still another object of the present invention to_provide_a surgical apparatus_having sealing structure for inhibiting the escape of insufflation_gas through the apparatus.
Yet another object_of the present_invention_to_provide a surgical apparatus_for driving staples which is adapted_for mounting a replaceable cartridge assembly._1. Technical Field
The present invention generally relates_to drive line power transfer mechanisms_and more particularly to drive_line power_transfer mechanisms that include a_cooling system.
2. Discussion
Modern_vehicles typically_include an axle_assembly having a housing and a_differential assembly. The_housing includes a cavity into which_the_differential assembly is_positioned._The_differential assembly_is rotatably supported_by_the housing_within_the cavity. The differential assembly is_mechanically_coupled to the vehicle engine by a_drive shaft. The differential_assembly_is also coupled to_the vehicle drive wheels via_a pair of axle shafts. The_differential assembly_regulates drive_torque between the axle shafts, thereby permitting the shafts to rotate_at different velocities as when the_vehicle is operated in_a cornering_maneuver.
During_the operation of_the_vehicle, friction_between the various components of the axle_assembly can_cause the components to heat up_and decrease the useful_life_of the components of the axle_assembly. One solution that has been_proposed is the circulation of_a_lubricating_fluid through a heat exchanger_located remotely from the axle assembly._One drawback associated_with this approach is that due to_the_viscosity of the axle assembly lubricating_fluid,_this fluid is difficult to pump_to_a_remote location, particularly when the_ambient temperature is relatively cold.
Another solution_that has been proposed is the use of a_separate heat exchanger_within the cavity of the_axle_housing._The heat exchanger is mounted to the interior of the_axle housing_such that it_is suspended within a pool of lubricating fluid. One drawback_associated with this approach is that any_fluid that leaks from the heat exchanger will contaminate the lubricating_fluid. In severe cases, the lubricating characteristics of_the lubricating fluid can be destroyed if_a sufficient quantity of_fluid_leaks from the heat exchanger.
Accordingly, the remains_in_need_art_for an axle_assembly having an_improved cooling system_that provides_adequate cooling of_the axle_lubricant while minimizing_the_risk of contamination of the axle lubricant