TWI424830B - 骨骼固定裝置 - Google Patents

骨骼固定裝置 Download PDF

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TWI424830B
TWI424830B TW095124724A TW95124724A TWI424830B TW I424830 B TWI424830 B TW I424830B TW 095124724 A TW095124724 A TW 095124724A TW 95124724 A TW95124724 A TW 95124724A TW I424830 B TWI424830 B TW I424830B
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head
stem
fixation device
bone fixation
receiving portion
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TW200706155A (en
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Wilfried Matthis
Lutz Biedermann
Jurgen Harms
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Biedermann Technologies Gmbh
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • A61B17/7037—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other wherein pivoting is blocked when the rod is clamped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
    • A61B17/7067—Devices bearing against one or more spinous processes and also attached to another part of the spine; Tools therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
    • A61B17/7076—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
    • A61B17/7083—Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements
    • A61B17/7085—Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements for insertion of a longitudinal element down one or more hollow screw or hook extensions, i.e. at least a part of the element within an extension has a component of movement parallel to the extension's axis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875—Screwdrivers, spanners or wrenches
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
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Description

骨骼固定裝置
本發明係關於骨骼固定裝置，包括固定元件，具有要固定於骨骼內之幹部，外表面呈球形截頭部之頭部；接納部，以接納該頭部；以及對該頭部之施壓元件，其中該幹部和該頭部係分開組件。
此種骨骼固定裝置見於美國專利第6,835,196 B2。固定元件的幹部具有圓筒形端部，接納於頭部之相對應腔孔，具有彈性屈服邊緣，對頭部施壓時，可夾持幹部之該端部。在另一具體例中，幹部的端部有陽螺紋，與接納該端部的頭部內之腔孔陰螺紋嚙合。以此骨骼固定裝置，可先旋入幹部內，必要時，調節幹部長度，再與含頭部之接納部連接。
US 6,074,391揭載一種骨骼固定裝置，包括骨釘，有螺紋幹部，球形截頭形成幹部自由端。骨骼固定裝置又包括接納件，內側有錐形環狀表面，向下輻輳。接納件內設有長孔籠，包容球形截頭，並有外部錐形表面，與接納件的錐形表面協合。對該籠施壓時，籠內長孔可夾持幹部之球形截頭。
WO 94/00066揭示一種接骨固定裝置，包含有錐形頭段的固設組件，設計來固定於骨骼內的毗鄰固定組件，以及球形截頭之有長孔夾持組件，有錐形腔孔可接納錐形頭段，在內側夾持有球形截頭腔孔之連接組件。夾持組件的外表面有球形截頭部。固設組件固定於連接組件內，是藉錐形頭段拉入夾持組件內達成，使夾持組件展開，壓緊於連接組件之球形截頭腔孔。
US 6,063,090揭載一種桿和腳釘之連接裝置，可將螺釘元件以球形頭部先旋入骨骼，然後把要與桿連接的扣頭套上球形頭部。要把螺釘元件相對於扣頭的角位固定，是利用錐形彈性夾頭夾持球形頭部。
本發明之一目的在於提供一種骨骼固定裝置，具有頭部和幹部呈分開組件，方便裝置之預組裝，當最後發生螺釘旋緊於桿時，可供增進固定。
此目的是以申請專利範圍第1項之骨骼固定裝置解決。進一步發展是列於申請專利範圍附屬項。
本發明骨骼固定元件之優點是，在手術之際和之前，可按照特殊情形之需要，將不同尺寸的幹部與分開頭部與接納部組合。
以本發明骨骼固定元件，可先把幹部固定於骨骼，然後把包含球形截頭的頭部之接納部安裝於幹部。由於幹部的端部錐形與頭部的協合凹部，可達成頭部相對於幹部預固定，即使頭部尚未鎖定於其最後多軸位置。
若幹部的端部和頭部的凹部之錐形角度，在約2°至10°的一定範圍，球形截頭之頭部和幹部間可達成自行鎖定連接，確保頭部不會脫落，或意外與幹部分開。
骨骼固定裝置又有優點是精巧，因不需外環或螺帽。
本發明其他特點和優點，由如下參照附圖所示具體例之說明，即可明白。
如第1圖至第3圖所示，骨骼固定裝置包括接納部1，呈實質上圓筒形，有第一端2，和在第一端相對面之第二端3。二端對縱軸線4垂直。設有與縱軸線4共軸的共軸腔孔5，從第一端2延伸至離第二端3預定距離處。在第二端3設有開口6，其直徑較腔孔5直徑為小，共軸腔孔5朝開口6斜縮。在圖示具體例中，斜縮成球形段7之形狀。
接納部1又有U形凹部8，從第一端2起，按第二端3方向，延伸至距該第二端3預定距離。利用U形凹部，形成二自由股部9,10，朝第一端2為止。相鄰於第一端2，接納部1包括在該股部9,10之陰螺紋11。
骨骼固定元件13包括有骨骼螺紋之幹部14，和頭部15，形成分開組件，在第1圖所示組合狀態，連接於幹部。頭部15有球形截頭外表面部16。頭部15的此部份半徑，使得頭部15接納於接納部1內時，頭部15之球形外表面16，受到第二端3與開口6相鄰球形段7的支持，或以開口邊緣支持，使頭部15的部份15a從開口6突出。對頭部15未旋壓時，頭部15樞動保持在球形段7內，類似球窩接頭。
再者，設有施壓元件17，具備圓筒形構造，其外徑僅稍小於腔孔5的內徑，容許施壓元件可引進接納部1之腔孔5內，並在軸向運動。在朝向第二端3的下側，施壓元件17包括球形凹部18，其半徑相當於頭部15的球形部16半徑。在相反側，施壓元件17有U形凹部19，橫向延伸至縱軸線4。選用此U形凹部的側向直徑，使要接納於接納部內之桿20，可插入凹部19內，並在其內側向導引。選擇球形凹部18之深度，使得在組裝狀態，即桿插入並壓緊於U形凹部之底部時，施壓元件17對頭部15施加壓力。
骨骼固定元件又包括內螺釘21，可旋入股部9,10之間，把桿20固定，經由施壓玵件17對頭部15施壓。陰螺紋11和內螺釘21之協合螺紋，可有任何已知的螺紋形狀。然而，平板螺紋或負角度螺紋的優點是，股部9,10不會發生張開，故不必使用外螺帽或外環。
茲詳述幹部14和頭部15。幹部14包括端部22，可接納於頭部15內。端部22形如截頭錐體，朝直徑ds的自由端23加寬。宜選擇幹部的錐形端部之錐角α，在幹部連接於頭部時，可達成自行鎖定連接。特別由第2和3圖可見，頭部15輪廓為切平的球體，在其面朝第一端2的末端包括腔孔24，與接納部的縱軸線4共軸，直徑比錐形端部22的自由端23最大直徑ds稍大。腔孔24容許導引貫穿錐形端部22之外端23，使錐形端部22完全插入時，從頭部15突出，如第1圖所示。頭部15在指向接納部第二端3之側，有凹部25形成空心截頭錐體，其維度是在幹部插入頭部15內時，可與幹部的錐形端部22維度相配。錐形凹部25的角度α'宜相當於端部22之角度α，或比角度α大。凹部25形成的下開口26之直徑db，比幹部的錐形端部22之自由端23最大直徑ds為小。
如第2和3圖所示，頭部15有複數縱向細縫27，對面向幹部的端部22之末端開口，在沿周方向等距配置。細縫27尺寸足以容許凹部25展開，至下開口26加寬到容許錐形端部22插入的程度，並在插入後，彈性夾持端部。
如第4圖所示，錐形端部的自由端23有切角28，以方便插入頭部15內。切角28可彎曲，與施壓元件17的凹部18曲率相配，錐形凹部25亦可延伸貫穿頭部15。
頭部15的凹部25錐角α宜相當於端部22之錐角，其選擇是當錐形端部22插入頭部的凹部25內時，可達成自行鎖定連接。一旦建立自行鎖定連接，即需額外力量從凹部25取出錐形端部，比錐形端部插入凹部25必要之力為大。達成自行鎖定效果之錐角以大約2°至10°之間為佳，以約4°更好。
在第一種操作模態中，選用適當幹部14，以其端部22連接至頭部15。利用切角28可方便錐形端部22通過下開口26引進入頭部15。藉插入端部22，把下開口26撐寬，錐形凹部25即因細縫27而張開，以便容許全錐形端部22引進。若選用角度α，在幹部引進入頭部內時，達成自行鎖定連接，則一旦插入頭部內，頭部即不會脫落或意外掉出。
然後，由幹部14和所安裝頭部15組成之骨骼固定元件，從第一端2引進到接納部1內，有螺紋之幹部14導經接納部之開口6，直至頭部15緊靠開口6的邊緣。然後，引進施壓元件17，把有螺紋幹部旋入骨骼內。再調節接納部1相對於固定元件13之角位，把桿20插入。再旋入內螺釘21，把桿固定。內螺釘21對桿20施壓，把施壓元件17壓下。施壓元件17形成幹部的端部22自由端23之支座。如此一來，頭部15壓緊球形區7或開口6邊緣，使開口6邊緣因細縫27壓縮頭部，夾持幹部之端部22。此外，施壓元件17壓住端部22之自由端23，因而把錐形端部22壓入頭部之錐形凹部25內，於是，頭部和幹部間達成牢固連接，同時頭部鎖定於其轉動位置。
上述骨骼固定裝置之組件，最好是由人體相容性材料製成，例如鈦。
在第二種操作模態中，先把有螺紋幹部14旋入骨骼或脊椎內。為此目的，幹部14在其自由端有已知螺絲起子結合之可能性，諸如六角形凹部30，像第1圖所示。接納部1再和鬆弛預組裝的頭部15及施壓元件17，一同施壓於突出骨骼外的幹部14之錐形端部22。為完成此事，必須要有一定的壓力把頭部15推上錐形端部，即頭部由於細縫而張開，並套合於錐形端部22。把頭部放到幹部上所需壓力，視錐角和/或細縫提供的彈力而定。在此狀態下，頭部仍然可在接納部內樞動，而幹部則被頭部夾持。其次，把桿20插入，調節接納部1相對於頭部15之角位。然後，內螺釘21旋入股部9,10之間，直至壓到桿20上，因而對頭部15施壓。
由於施壓元件對頭部15所施壓力，此有長孔頭部15即牢靠連接或夾持於幹部14，防止運動，同時，頭部15即鎖定於其轉動位置。
必要時，接納部1連同頭部15即可用工具在原位與幹部脫離，如第8a至8d圖及第9圖所示。首先，將內螺釘和桿拆除，如第8a圖所示。在此狀態，頭部15在接納部1內解鎖，但仍夾持幹部之端部22。其次，如第8b圖所示，使用工具100把頭部15推入到接納部1內，故不再從接納部的下開口6突出。
工具100包括縱棒101，在垂直方向伸出二支臂102,103。支臂之一固定在離棒101的自由端104一定距離，使棒之一段突出於支臂103上方，方便夾持。在圖示具體例中，工具使用中是指上支臂103。另一支臂102可滑動安裝於縱棒101，且可變化固定於他端106的末端位置和朝向上支臂103所需位置之間，故可變化支臂間之距離。至少下支臂為叉形，得以包圍幹部14。下支臂102位於棒的末端106時，支臂間的距離比接納部1的長度為大。
使用時，工具應用於接納部，下支臂102在其末端位置，如第8b圖所示。即移動下支臂102，壓緊接納部1之第二端3，接納部1因而相對頭部15移動，直至頭部15完全在接納部內，如第8c圖所示。在此狀態，頭部有擴張空間，故當工具連同接納部和頭部拉離幹部時，幹部即會被拉開，如第8d圖所示。
可以修改，例如下支臂可換成上支臂103在滑動。滑動支臂不需固定於棒，但可用手動壓緊接納部。
選擇端部22、頭部15和接納部1之維度，使克服端部22和頭部15間自行鎖定連接之摩擦力所需力量，在手術當中可以容忍。
第5a至5c圖表示幹部14之修改。在第15a圖內，幹部14的直徑d較錐形部22的最小直徑更小。在第5b圖內，幹部14的直徑d比錐形端部22的最小直徑更大。在第5c圖內，幹部包括鄰接尖端141的螺紋段140，和無骨骼螺紋之段142。在所有修改中，錐形端部22的形狀可接納在頭部15之凹部25內。
第6圖表示頭部修改之示意圖。頭部15'有截頭錐形之凹部25，一如第1至4圖所示具體例。然而，錐形腔孔24'的的直徑較幹部錐形端部的末端23直徑為小。因此，凹部25的上壁形成端部22之環狀支座28。腔孔24'直徑大到剛好可供旋入工具存取端部22。為使頭部15連同接納部1可在原位與幹部14分離，頭部具有結合機構，可與持有頭部之工具結合，故接納部1拉離幹部時，不會拉到碰到開口6。第7圖表示工具30之例，包含手柄，和從手柄延伸之棒32，具有螺紋端部33。在此情況，腔孔24'包括陰螺紋，與螺紋端部33結合。使用上，在除去內螺釘21和桿後，即釋除對頭部15之壓力，利用螺紋尖端33旋入螺紋腔孔24'，以工具30持有頭部，同時以手動把接納部拉離幹部。如此一來，幹部的端部22被拉脫離頭部15。
本發明不限於上述具體例，可構思進一步修改。例如，本發明不限於具有螺紋幹部之固定元件，亦可應用於由鈎組成的固定元件。在此情況下，鈎的自由端具有錐形端部22。
此外，幹部14的形狀和直徑可以變化，骨骼螺紋之長度亦可變化。例如，第5c圖修改為幹部具備無螺紋段，亦可應用於第5a圖或第5b圖所示幹部。
可以選擇錐形端部22的錐角，和空心截頭錐體形之凹部25，使不具有自行鎖定效果。在此情況，必須選擇頭部15之細孔26數目和形狀，使頭部15可套合於錐形端部22上。
頭部15有若干細孔，亦可改為唯一細孔，按縱向延伸貫穿頭部之全壁。除第3圖所示細孔外，亦可有一連續細孔。可設額外細孔，朝下開口26相反端開啟。又，形成空心截頭錐體之凹部25亦可延伸貫穿全頭部15，因而省略腔孔24或24'。
在又一修改中，頭部係由具有彈性的材料形成，例如適用之塑膠材料。在此情況下，細孔可省略。
接納部亦可修改。球形段7半徑可較頭部半徑大，只要開口6小到夠使頭部15不會脫出即可。球形段7亦可改為有一段是其他形狀，例如錐形。
再者，施壓元件17可有不同形狀。施壓元件在縱向的長度可大到在桿插入時，由U形凹部19所發生的股部突出到桿上方。在此情況下，可經由施壓元件，以要旋入股部9,10中間的內螺帽，分開把頭部15固定，並以要旋入螺帽的內螺釘，分開將桿固定。
接納部可為骨骼板之一部份。在此情況，接納部不會有U形凹部，即可例如單獨由內螺釘發生對頭部15之壓力。
1．．．接納部
2．．．第一端
3．．．第二端
4．．．縱軸線
5．．．共軸腔孔
6．．．開口
7．．．球形段
8,19．．．U形凹部
9,10．．．自由股部
11．．．陰螺紋
13．．．骼固定元件
14．．．幹部
15,15'．．．頭部
15a．．．頭部在開口突出部
16．．．球形外表面
17．．．施壓元件
18．．．球形凹部
20．．．桿
21．．．內螺釘
22．．．錐形端部
23．．．錐形端部之自由端
24,24'．．．錐形腔孔
25．．．錐形凹部
26．．．凹部的下開口
27．．．縱向細縫
28．．．自由端的切角,環狀支座
30．．．六角形凹部
31．．．手柄
32．．．棒
33．．．螺紋端部
30,100．．．工具
101．．．縱棒
102,103．．．支臂
104．．．縱棒的自由端
106．．．棒的末端
141．．．尖端
142．．．無骨骼螺紋之段
146．．．螺紋段
ds．．．最大直徑
db,d．．．直徑
α,α'．．．角度
第1圖表示本發明骨骼固定裝置一具體例之斷面圖；第2圖表示第1圖骨骼固定裝置之分解圖；第3圖表示第1圖骨骼固定裝置一部份的骨骼固定元件頭部之透視圖；第4圖表示第1至3圖骨骼固定元件的頭部和幹部末端之簡略斷面圖；第5a至5c圖表示固定元件的幹部之修改；第6圖表示連接於幹部的頭部修改之簡略斷面圖；第7圖表示要用於第6圖頭部的工具之簡略側視圖；第8a至8d圖表示第1至4圖頭部和接納部，連同工具，在原位拆除之簡略步驟圖；第9圖為第8a至8d圖步驟中所用工具之仰視圖。
1．．．接納部
2．．．第一端
3．．．第二端
4．．．縱軸線
5．．．共軸腔孔
6．．．開口
7．．．球形段
9,10．．．自由股部
11．．．陰螺紋
15．．．頭部
15a．．．頭部在開口突出部
16．．．球形外表面
17．．．施壓元件
20．．．桿
21．．．內螺釘
22．．．錐形端部
24．．．錐形腔孔
30．．．六角形凹部

Claims (9)

  1. 一種骨骼固定裝置，包括：固定元件，包括要固定於骨骼或脊椎之幹部(14)，和頭部(15)，頭部在外表面有球形截頭部(16)，其中該幹部(14)和該頭部(15)係分開組件；接納部(1)，包括第一端(2)，在第一端對立之第二端(3)，貫穿二端之縱軸線(4)，與縱軸線共軸之腔孔(5)，鄰接第二端(3)之第一區(7)，供接納該頭部之球形截頭部(16)；以及其中接納部有二自由股部(9,10)，尾部朝向第一端；內螺釘(21)，可旋入自由股部(9,10)之間，把桿(20)固定，經由施壓元件施壓於頭部；其中設有施壓元件(17)，適於施壓該頭部(15)，把該頭部鎖定於接納部內；施壓元件係圓筒形構造，其外徑比腔孔(5)內徑稍小，容許施壓元件引進入接納部之腔孔內，並在軸向運動，且其中施壓元件之圓筒軸線係與接納部之縱軸線(4)共軸；其中該頭部有空心內部(25)，接納該幹部之自由端部(22)，且其中該頭部和該端部形成方式，使該頭部未鎖定時，端部即被該頭部彈性夾持，又其中該端部(22)呈錐形，直徑朝自由端(23)遞增，而該空心內部(25)具有相配形狀者。
  2. 如申請專利範圍第1項之骨骼固定裝置，其中該錐形係截頭錐體者。
  3. 如申請專利範圍第1或2項之骨骼固定裝置，其中選擇錐角，使頭部和端部之間發生自行鎖定者。
  4. 如申請專利範圍第3項之骨骼固定裝置，其中該角度介於約2°和10°之間者。
  5. 如申請專利範圍第1或2項之骨骼固定裝置，其中頭部 (15)包括彈簧狀屈服邊緣，面朝幹部之端部(22)者。
  6. 如申請專利範圍第1或2項之骨骼固定裝置，其中頭部(15)包括一或以上之細孔(27)，實質上平行於頭部之縱軸線指向，並在面向該幹部(14)的端部(22)開口者。
  7. 如申請專利範圍第1或2項之骨骼固定裝置，其中接納幹部的端部之該頭部的空心內部，形成端部(22)的自由端(23)用之支座(28)者。
  8. 如申請專利範圍第1或2項之骨骼固定裝置，其中空心內部形成空心截頭錐體，並從頭部一端延伸至另一端者。
  9. 如申請專利範圍第1或2項之骨骼固定裝置，其中該接納部(1)具有U形凹部(8)，從第一端(2)按第二端(3)延伸，形成溝道以接納桿者。
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US20090326587A1 (en) 2009-12-31
US20070055240A1 (en) 2007-03-08
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US8034089B2 (en) 2011-10-11

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