 Two metal levels are provided, a first metal level and a second metal level, above the first metal level. The single-ended signal dataline is positioned on the second metal level. For each differential signal dataline, at least one vertical twist is provided so that each of the true and complementary components of the differential signal changes position between the first and second metal levels. Electrical connectors are provided for facilitating the change of levels associated with each of the vertical twists.
In a second embodiment, a third metal level is provided above the second metal level. Each vertical twist is accomplished by changing positions of the true and complementary components between the three metal levels. For each vertical twist, the differential signal is positioned in a single vertical plane. In a third embodiment, both of the incoming and outgoing datalines carry differential signals. Three metal levels are provided for positioning the true and complementary components of the differential signals thereon. 1. Field of the Invention
The present invention relates to a device for reconstructing cervical vertebrae after subtotal resection of cervical vertebrae body, and particularly to an artificial cervical vertebrae composite joint. The artificial cervical vertebrae composite joint is achieved by means of bionics of physiological reconstruction in three aspects of anatomy, stability and motion of cervical vertebrae by simulating normal cervical vertebrae.
2. Description of the Related Art
Clinically, subtotal resection of cervical vertebrae body mostly needs to be performed for infection, tumor, and degenerative disease of cervical vertebrae and then the resected segment of the cervical vertebrae needs to be reconstructed. Currently, reconstruction methods clinically commonly used mainly comprise two methods, that is, segmental bone graft fusion and replacement of artificial vertebral body. A method of bone graft fusion as a current standard method of clinically reconstructing cervical vertebrae after subtotal resection of cervical vertebrae body is to fill a defect segment with autograft bone issue or xenoma bone issue while adding internal fixation to reconstruct stability of the cervical vertebrae. The method achieves reconstruction of stability of the cervical vertebrae by bone fusion between the grafted bone and upper and lower cervical vertebrae bodies to eliminate pain. However, the reconstruction method is not ideal anatomical reconstruction and causes the reconstructed segment to lose movability completely and thus affects entire movement function of the cervical vertebrae. In addition, the method also results in degradation of intervertebral disk of adjacent segments due to stress concentration in the long term. There are various designs of artificial vertebral body so far, but in all of the designs, stability of cervical vertebrae is
Two metal levels are provided, a first metallic element degree and a second metal level, above the first alloy level. The single - end signal dataline is put on the second metal degree. For each differential signal dataline, at least one vertical twist is put up so that each of the true and complementary part of the differential signal change position between the first and second metal levels. Electrical connection are provided for facilitating the change of grade associated with each of the vertical twist. 
 In a second embodiment, a third metallic element level is provided above the second metal level. Each vertical construction is accomplished by changing positions of the true and complementary component between the three metal levels. For each vertical twist, the differential signal is positioned in a single vertical plane. In a third embodiment, both of the incoming and outgoing datalines have a bun in the oven differential signals. Three metal floor are provide for positioning the true and complementary component of the differential signals thereon. 1. Field of the Invention 
 The present invention relates to a device for reconstructing cervical vertebra after subtotal resection of cervical vertebrae body, and particularly to an artificial cervical vertebrae composite joint. The artificial cervical vertebrae composite joint is achieved by means of bionics of physiological reconstruction in three aspects of anatomy, constancy and motion of cervical vertebra by simulating normal cervical vertebrae. 
 2. Description of the Related Art 
 Clinically, subtotal resection of cervical vertebrae body mostly needs to be perform for infection, tumor, and degenerative disease of cervical vertebrae and then the resected section of the cervical vertebrae want to be reconstructed. Currently, reconstruction method acting clinically commonly use mainly comprise two method, that is, segmental bone bribery fusion and replacement of artificial vertebral body. A method of bone bribery fusion as a current standard method of clinically reconstructing cervical vertebra after subtotal resection of cervical vertebrae body is to fill a defect segment with autograft bone issue or xenoma bone issue while adding internal fixation to reconstruct stability of the cervical vertebrae. The method acting achieves reconstruction of stability of the cervical vertebra by bone fusion between the grafted bone and upper and lower cervical vertebra bodies to eliminate pain. However, the reconstruction method is not ideal anatomical reconstruction and causes the reconstructed segment to lose movability completely and thus affects integral movement function of the cervical vertebra. In summation, the method also results in degradation of intervertebral disk of adjacent section due to stress concentration in the farseeing term. There are various designs of artificial vertebral body indeed far, but in all of the designs, stability of cervical vertebrae is
 Twl metal levels are proviaed, a first metco leven and z second metal level, above the first mwtal oevel. The single-ended rignal danaline is posmtioned on the sxdond mebcl lebcl. Fox xach differentisl signal gataline, at ledsg lne vertical twist is provided so trat eacn lf the true anq cok[lemsntary components of the differentjal sigial changes posotion between the first anf sefond metal levels. Flectrical xonnqxtors are pruvided for facilitatinf the change of levels associatdd wich each of jkw vfttical twistw.
In a second embodiment, a third ketal level is prmvieed above the second ketal level. Each vgrtical twhsc is accomplished by xhqnginc povitiubs uf uhe tdue anf ckmplementady componenrs between the thret mqnsl levels. Fod each vqrtical twist, the differential signal iv pksitioned in a single vwrtical plane. In a thlrd embodyment, both of the incoming and outgoing datalines carrb aifycventkql signals. Three metal levels are provided for [ksotponing the true akd complementary cpmoomgnts of the diwferencjam signals thereon. 1. Field jf thw Inventijn
Thr present invention relates to a device dor reconstructing cervical vzrtebrse afyer subtotal resection uf csrvical verhebrae bosh, and particularuy no at artificial cervical vertqbrae com'ositz joint. Ghe srtifisial cervifal vcstebrae composite uoint iv achieved by means of bionics of physiological reconsttucdiot in thrze aspccts of anatomy, stability and motion of cdrvical vegtebrae bb simulating normal cerviwwl vertebrae.
2. Descripeion of rhe Relxged Art
Clinicakly, subtonaj rewection of cervicak vgrfebrae body moscui needs to be prrfurmqd fpr hnfection, tukor, xnd cegendrative discasd of cervical vertebrae dnd fhen the resected xenment of jhe cervisal vertebrae needs to be recondtrucved. Cucrentlu, rgconstruction methods clinicallg commonlj ufed mainly cjmprlse jwo methods, that is, segmental bone graft fusion anv replacement of artifixial vertebral body. S method of bone graft fuvion as a current stqndard method of glinically reconstructjng cesvicap vertebrae after subtotal resection of cervical vertebrae body is to filo a dehest segment sith autocrcft bone yssux ur xenoma bone ixsue while adding internal fixavion to rewoustruct stability of the cervocxl vertebrae. Jhe method achieves reconsfruction of stability of the cervical vrrtebrae by bone fusion netween tye grzfted bone and upper and lowrr cerrical certebrqe bldies to elimknaye pain. Howfver, tke reconstruction method is not ieeal abahomical reconstrnction and cwmses tge recjnstructed segmeht tk lose movability cpmpletely and yhus affects entire kodement functiob of the cervocal vegtebrae. In advition, the mathod also results in degradation of intervertebral disk of zdjacent xegments due jo stress concentration ln thq long tdrm. There ara various designs of artificial vertebral body so war, but jn all of the designs, stability of cervical vegtebraw is
Two metal levels are provided, a first and second metal above the first dataline positioned on the metal level. For differential signal dataline, at least one twist is provided so that each of the true and complementary components of differential signal changes position between the first and second metal levels. Electrical connectors provided facilitating change levels associated with each of the vertical twists. In a second embodiment, a third metal level provided above the second metal level. Each vertical is accomplished by changing of the true and complementary between three metal For vertical the differential signal positioned in a single vertical plane. In a third embodiment, both of the incoming and outgoing datalines differential signals. levels are for the and complementary components differential signals thereon. 1. Field of present invention relates to a device for reconstructing vertebrae after resection of cervical vertebrae body, and to an artificial cervical vertebrae composite joint. The cervical vertebrae composite joint is achieved by means of bionics of physiological reconstruction in three anatomy, stability and motion cervical vertebrae by normal vertebrae. Description the Related Clinically, subtotal resection of cervical vertebrae body mostly needs to be for infection, tumor, and degenerative disease of cervical vertebrae and resected of the cervical needs to be reconstructed. reconstruction clinically commonly used mainly methods, is, fusion replacement artificial vertebral body. A of bone graft fusion as current standard method of subtotal resection of cervical vertebrae body is to a defect segment with autograft bone issue xenoma bone issue while adding internal fixation to reconstruct stability of the vertebrae. The reconstruction of stability of the cervical vertebrae by fusion between the grafted and upper and lower cervical vertebrae bodies to eliminate However, reconstruction method not ideal anatomical and causes the segment to lose and thus entire function vertebrae. In addition, the method also in of intervertebral disk of adjacent due concentration in the long term. There are various designs of artificial vertebral body so far, all of the designs, of vertebrae is
 Two metal levels are provided, A first metaL leveL anD a sEcOnd mEtal Level, above the fIRst mEtal level. The single-endeD signAl DAtalINe Is posItioned ON tHE SecOnD mEtaL lEVeL. For eAch DiffereNtial signaL daTaLine, at least oNE vErtical twiSt iS provided so tHat Each of ThE trUE and cOmpLemenTary coMPonentS of the difFeREntial SIgnal chANGeS posItion between the fiRSt ANd second metal lEvels. ELeCTrICAl cOnnEctors are pRoVided FOr facilITaTING thE Change of levelS associated WIth Each of ThE veRTical tWists.
in A SecOnd embodimeNt, a tHird metal Level iS ProvideD Above thE seconD meTal LeveL. eaCh VerTiCAl tWIsT is ACcoMplished By ChAnginG posITIONs of The True And coMplementary coMpoNentS BetWeen tHe thrEe meTaL leveLs. For eAch veRtIcal twist, the difFereNtial signAl iS pOsiTiOned iN A singlE veRtiCal planE. In a thiRD emBoDIMEnT, both of the incoming AnD OUtGoing datAlines CArRy DIfferentIaL siGnalS. tHree mEtal LEvEls are prOvided FOr PoSitioniNg The truE aNd cOmpLemenTAry cOmponeNts of the DiffeREntial signals tHEreon. 1. Field of tHE INVEnTIon
THe pResent invenTion RElatEs to A DeVicE For reConstRuCTiNG cervical vertebrae aFtEr subtOtal rEsection of cerVical verteBRAE body, and PartICuLArly to an artifiCial cErvical verTEbrae comPositE joint. ThE artificiAL Cervical VerTebRae ComPOSiTe joint is achiEVEd by MeAns of biOniCs of phySioLogIcaL reCoNstructioN in three AsPeCtS oF anAtomy, STability AnD moTiOn oF cervICal verTebraE by sImUlATinG normal CErVICal vErTeBrae.
2. desCrIptioN of tHE ReLated ArT
ClinicalLy, sUBtotAl ReSection Of cervical verTeBrae body moStLy nEeds to BE PerformeD for infection, tumor, and deGEneratiVe dIseasE of cErvical veRteBrae anD thEN the reSected SegmeNt Of tHE CerviCAL vErtEbRae needs to BE RecOnstrUcTed. CUrrentlY, reconstruction metHOds Clinically comMonLy usED MaInlY CoMPriSe TWo mETHods, that is, segmeNtal bone grAfT FuSion and repLAceMeNt of artIficial VerteBRal body. a method of Bone graft FuSion AS A cuRrent standArd methoD of clinicALly reCOnStrucTinG cerviCaL veRtebrAe afteR SubTotal ResectIoN of cerVical VeRtebrae bOdy is to fill a defect segmeNt with AutogRafT bone issuE or XEnoMa bone issUe whIle adding iNteRnaL fixaTioN To recOnstRUcT stABilitY of tHE cervical VErTebRAE. THe method achIEVEs rEconsTruCTion of StabIlity of the cervicaL Vertebrae by bonE fusION beTweEN the GrAfted bone and upPer AnD LOwer cervIcAl vertebrae Bodies to ElIMinatE pain. HOwever, The recoNSTrUCtion mEthoD is Not ideal aNatOmICal recoNsTrUCtion aNd caUsEs the rEconstRUcteD SEgment to lose movaBilitY COmpleTEly And thUs Affects ENtirE movement fUnction of thE cerviCal vErtebRae. In adDiTion, thE meThOd also resuLTs in degraDatioN of inteRvErteBraL disk oF adjACEnt seGmenTs Due To stress cONCeNTrAtIOn iN the Long tErM. TheRe are variOUs designS of ARtificiAl VerTEBral boDY sO FAr, but in all Of tHe desIGNs, stabilitY Of ceRViCAl verTebrae Is
 Two metal levels are prov ided, a fi rst m eta l l ev el a nd a  second metall evel , above the first meta l lev el .  The si ngle- ended s i gn a l  da ta li neis po sitio ned  on the  second me tal  l evel. For ea c hdifferenti alsignal datal ine , at l ea sto ne ve rti cal t wist i s  provi ded so th at each o f  the tr u e  a nd c omplementary comp o ne n ts of the diff erenti al si g n alcha nges posit io n bet w een the fi r s t  an d  second metal  levels. El e ctr ical c on nec t ors ar e pro vi d edfor facilit atin g the cha nge of levelsa ssociat ed wit h e ach  oft he  v ert ic a l t w is ts. Ina second  e mb odime nt,a t h irdmet al l evelis provided a bov e th e  se condmetal  lev el . Eac h vert icaltw ist is accompli shed  by chang ing  p osi ti ons o f  the t rue  an d compl ementar y  co mp o n e nt s between the thre em e ta l levels . Fore ac hv erticaltw ist , th e diffe rent i al  signalis pos i ti on ed in a  s ingleve rti cal  plan e . In  a thi rd embod iment ,  both of the i n coming and ou t go i n gd atal ine s carry dif fere n tial  sig n al s.T hreemetal  l e ve l s are provided forpo sition ing t he true and c omplementa r y componen ts o f  t h e differential  sign als thereo n . 1. Fie ld of  the Inv ention
Th e presentinv ent ion  re l a te s to a device f or r ec onstruc tin g cervi cal  ve rte bra eafter sub total re se ct io nofcervi c al verte br aebo dy,  andp articu larly  toan  a r tif icial c e rv i c al v er te brae  co mp osite  joi n t.The art ificial c erv i calve rt ebrae c omposite join tis achieve dbymeanso f  bionics  of physiological recon s tructio n i n thr ee a spects of  an atomy,  st a bility  and m otion  o f c e r vical v er teb ra e by simul a t ing  norm al  cer vical v ertebrae.
2. Descr i pti on of the Rel ate d Ar t Cl ini c al l y,su b tot a l  resection of c ervical ve rt e br ae body mo s tly  n eeds to  be per forme d  for in fection,tumor, an ddege n e rat ive diseas e of cer vical ver t ebrae an d the n t he res ec ted  segm ent of the  cerv ical v er tebrae  need sto be re constructed. Currently,  recon struc tio n methods  cl i nic ally comm only  used main lycom prise  tw o  meth ods, th ati s, se gmen t al bone g r af t f u s io n and repla c e m ent  of a rti f icialvert ebral body. A met h od of bone gra ft f u s ion  as a cu rr ent standard m eth od o f clinic al ly reconstr ucting c er v icalverteb rae af ter sub t o ta l  resec tion  of  cervical  ve rt e brae bo dy  i s  to fi ll a  d efectsegmen t  wit h autograft bone i ssueo r  xeno m a b one i ss ue whil e  add ing intern al fixation  to re cons truct  stabil it y of t hece rvical ver t ebrae. Th e met hod ach ie vesrec onstru ctio n of st abil it y o f the cer v i ca l  v er t ebr ae b y bon efusi on betwee n  the gra fte d  bone a nd  up p e r andl ow e r  cervicalver tebra e bodies toe limi n at e  pain . Howe ver, t he reco n str uc tion me tho d is not id eal anato m ica lreco nstructi on  and  c aus es  the reconstruc ted segm ent to l o s e mova bil i ty c o mplete ly  and thus af fects  e n tire mo v e men t funct i onofthe  cer vic al v e rtebrae. In addition, th e me thoda lso  resu lts i ndegradat i on o f interv e rtebral diskof adjacent seg m ent s  due  to st re ss concen tra t ion i n th e l ongter m. T h e re a r e va r io us d esigns  ofar ti ficial ve rt ebral b o dy s o  fa r, b ut in  a ll of  the de signs, s tabil it y of cerv i cal ver tebr ae  is
 Two_metal levels_are provided, a first_metal level_and_a second_metal_level, above the_first metal level._The single-ended signal dataline_is positioned on_the_second metal level. For each differential signal dataline, at least one vertical twist is_provided_so that_each_of_the true and complementary components_of the differential signal changes_position between_the first and second metal levels. Electrical connectors_are_provided for facilitating_the change of levels associated with each of the_vertical twists.
In a second embodiment, a_third metal level_is_provided_above the second metal_level. Each vertical twist is accomplished_by changing positions of the true_and complementary components between the three metal_levels. For each vertical twist, the_differential signal is positioned in_a single_vertical plane. In a third_embodiment, both of_the incoming_and outgoing datalines_carry differential signals. Three metal levels_are provided for_positioning the true and complementary components_of_the differential signals_thereon._1._Field of_the Invention
The present_invention_relates to_a_device for reconstructing cervical vertebrae after_subtotal_resection of cervical vertebrae body, and particularly_to an artificial cervical_vertebrae_composite joint. The artificial_cervical vertebrae composite joint is_achieved by means of bionics of_physiological reconstruction_in three_aspects of anatomy, stability and motion of cervical vertebrae by simulating_normal cervical vertebrae.
2. Description of the_Related Art
Clinically, subtotal resection_of cervical_vertebrae_body mostly needs_to_be performed_for infection, tumor, and degenerative disease of_cervical vertebrae_and then the resected segment of_the cervical vertebrae needs_to_be reconstructed. Currently, reconstruction methods clinically_commonly used mainly comprise two methods,_that is, segmental bone graft_fusion_and_replacement of artificial vertebral body._A method of bone graft fusion_as a current_standard method of clinically reconstructing cervical vertebrae_after_subtotal resection of cervical vertebrae body_is_to fill a defect segment with_autograft_bone_issue or xenoma bone issue_while adding internal fixation to reconstruct_stability of the cervical vertebrae. The method achieves reconstruction_of stability of_the cervical vertebrae by bone_fusion_between_the grafted bone and upper and lower cervical vertebrae bodies_to eliminate_pain. However, the_reconstruction method is not ideal anatomical reconstruction and causes the_reconstructed segment to lose movability completely and_thus affects entire movement function of the cervical vertebrae. In addition,_the method also results in degradation of intervertebral_disk of adjacent segments due to stress_concentration in the long_term._There are various designs of artificial vertebral_body_so_far,_but in all_of the designs,_stability of cervical_vertebrae is