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TWI413515B - 椎間盤彌補器 - Google Patents

椎間盤彌補器 Download PDF

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Publication number
TWI413515B
TWI413515B TW097127719A TW97127719A TWI413515B TW I413515 B TWI413515 B TW I413515B TW 097127719 A TW097127719 A TW 097127719A TW 97127719 A TW97127719 A TW 97127719A TW I413515 B TWI413515 B TW I413515B
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Taiwan
Prior art keywords
top plate
substrate
spring
intervertebral disc
central axis
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TW097127719A
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English (en)
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TW200904388A (en
Inventor
Lutz Biedermann
Wilfried Matthis
Jurgen Harms
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Biedermann Technologies Gmbh
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Publication of TW200904388A publication Critical patent/TW200904388A/zh
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30721—Accessories
    • A61F2/30742—Bellows or hose-like seals; Sealing membranes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006—Properties of materials and coating materials
    • A61F2002/30092—Properties of materials and coating materials using shape memory or superelastic materials, e.g. nitinol
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30563—Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30565—Special structural features of bone or joint prostheses not otherwise provided for having spring elements
    • A61F2002/30571—Leaf springs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30841—Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2210/00—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2210/0014—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof using shape memory or superelastic materials, e.g. nitinol
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Neurology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Cardiology (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)
  • Surgical Instruments (AREA)

Description

椎間盤彌補器
本發明係關於一種椎間盤彌補器，有基板、與基板對立之頂板、延伸貫穿基板和頂板中心之中心軸線，以及各具有環形段和二自由端之補數彈簧，配置在包圍中心軸線，其中自由端分別連接基板和頂板，又其中環形段係指向背離彌補器之中心軸線。
例如從US 4,309,777號已知一種椎間盤彌補器，使用金屬彈簧，配置在基板和頂板之間。此種人工椎間盤包括上盤部和下盤部，有複數蝸形彈簧，從上盤部延伸至下盤部，可屈服性逼使盤部彼此分離。
US 6,770,094 B2號記載一種椎間盤彌補器，包括頭盤和尾盤，在被盤簧壓縮時，彼此彈性相偎支持。彈簧為記憶金屬合金組成，在體溫時顯示超彈性之性能。在一具體例中，彈簧係由葉片彈簧形成，呈長條形狀，其一端安裝於上盤，而另一端安裝於下盤。
US 7,201,776 B2號揭示一種人工盤替代品(ADR)，包含一對相對立的端板組件，各附設於上、下椎骨之一，有一緩衝組件，介置於端板組件之間；以及充填材料，含於緩衝組件內。在一具體例中，緩衝組件係輪胎狀組件，與裝置中心的金屬轂合作，輪胎內保持空氣、液體、凝膠或其他材料。
商業化的椎間盤彌補器，有一或若干缺點，諸如無軸向阻尼、無轉動控制、不恢復所有自由度，以及較自然椎間盤過份之運動範圍(ROM)。
本發明之目的，在於提供一種椎間盤彌補器，具有改進軸向阻尼，加上轉動控制和屈曲/延伸控制。
此目的是由申請專利範圍第1項之椎間盤彌補器達成。進一步發展列於申請專利範圍附屬項。
本發明椎間盤彌補器達成高度軸向阻尼，利用環形彈簧，其環形部指向背離中心軸線。由於彈簧以其自由端分別連接基板和頂板，可達成轉動控制。屈曲/延伸之運動範圍(ROM)減少大約±5∘，保護周圍關節，尤其是小平面關即。
末端止動部宜由彈料性材料製成，額外限制和阻尼軸向運動。
屈曲性保護軸套防止血管和組織成長進入彈簧間之空間內。
本發明其他特點和優點，凡精於此道之士從以下就本發明具體例參照附圖所述，即可明白。須知本發明可有其他不同的具體例，其細節亦可在諸方面加以修飾。因此，附圖和說明，只視為參考性質，並非僅限於此。
由第1至4圖可見，椎間盤彌補器包括基板1，和基板1對立之頂板2。基板1和頂板2各有板部1a,2a和中央圓筒形凸部1b,2b。基板1和頂板2的配置，使圓筒形凸部1b,2b彼此面對。中心軸線M延伸穿過凸部1b,2b的中心。螺紋腔孔11延伸貫穿與圓筒形凸部1b,2b共軸的基板1和頂板2。板部1a,2a在具體例內呈圓形，但可有任意其他形狀，尤其是適合相鄰椎骨端板輪廓之形狀。板部1a,2a稍微向外彎曲，各板部包括複數齒3，供固定於相鄰椎骨之端板。
基板1和頂板2係生理相容性材料製成，諸如鈦或不銹鋼，或生理相容性塑膠材料，諸如聚芳基醚醚酮(PEEK)。
複數彈簧4配置在基板1和頂部2之間。詳見第3圖，各彈簧4呈實質上平坦長條形狀，類似葉片彈簧，並包括二自由端段5a,5b，和自由端段5a,5b中間之環形彎段6。在較 佳具體例中，彈簧為葉片彈簧。
自由端段5a,5b係筆直平坦段，詳見第1圖。形成彈簧4的長條寬度使複數，例如六個彈簧，可配置包圍中心軸線M，相鄰彈簧間有空間。環形段6最外部份的寬度w最大，朝自由端段5a,5b遞減，見第3圖。彈簧4從自由端段5a,5b至環形段6最外部份之長度l是，當彈簧安裝於環形段6時，完全位在板部1a,2a之間。環形段6沿彌補器中心軸線M平行方向之最大直徑，使得在第1和2圖所示安裝狀態時，於彈簧4和基板1及頂板2之間有距離。
彈簧4可由任何高度屈曲性生理相容性材料製成。例如，彈簧可由顯示超彈性的形狀記憶性材料製成，尤指形狀記憶體金屬，諸如鎳鈦合金，此合金之特例為鎳鈦諾(Nitinol)。
由第1、3、5圖可見，安裝螺釘7係供彈簧安裝於基板1和頂板2間之用。各安裝螺釘7包括有螺紋的螺釘段8及其自由端之凹部9，供旋入工具結合之用。安裝螺釘7自由端對面，包括盤形部10，其直徑相當於圓筒形凸部1b,2b的直徑。各螺釘段8與分別延伸貫穿基板1及其圓筒形凸部1b和貫穿頂板2及其圓筒形凸部2b的共軸螺紋腔孔11結合。螺釘段的長度使得安裝螺釘7分別連接於基板1和頂板2，而彈簧4被盤形部10及圓筒形凸部1b,2b夾持時，凹部9可與旋入工具結合。安裝螺釘7係由類似基板和頂板的生理相容性材料製成。
在安裝螺釘7的盤形部10之間，設有阻尼元件12。阻尼元件以盤形為佳，更好是彈料性材料製成，諸如聚碳酸酯胺酯(PCU)。選用碟形厚度使其充滿安裝螺釘7間之空間。選用材料以達成所需阻尼效應。
在第1－4圖中可見，設有保護軸套13，沿周圍繞彈簧4，並從基板1延伸至頂板2。軸套13在徑向部份包圍彈簧4 之環形段6。因此，環形段6不與基板1和頂板2的板部1a,2a直接接觸。如此導致進一步軸向阻尼。保護軸套13是屈曲性材料製成，尤其是可用彈料性材料製造，諸如聚碳酸酯胺酯(PCU)。
椎間盤彌補器經預組裝，其方式是把彈簧4夾在安裝螺釘7的盤形部10和基部1及頂部2的圓筒形凸部1b,2b之間。阻尼元件12可固定於安裝螺釘的盤形部10之自由側，例如以粘著方式。當全部彈簧夾持時，安裝保護軸套。
使用時，把椎間盤彌補器插入二相鄰椎骨之間，以取代椎間盤。基板和頂板外表面之齒部3，結合入相鄰椎骨之端板內。於脊椎屈曲和延伸之際，即對一或若干彈簧施壓或釋壓，加以壓縮或延伸。同時，阻尼元件12阻尼純軸向運動。彈簧4亦提供轉動控制，因為自由端段5a,5b固定，當基板和頂板發生彼此相對扭動時，造成環形段6扭曲至某一程度。
彈簧的彈性和彈簧形狀在屈曲/延伸中限制運動範圍(ROM)至大約±5∘，以保護相鄰結構，諸如小平面關節和韌帶不致超過負荷。實質軸向阻尼(與天然椎間盤相似)，限制軸向壓力至生理範圍，並容許人工盤和小平面關節(「鎖定小平面」)之彈性互動。
可以修改。基板和頂部形狀在解剖學上可更為適應椎骨的端板。因此，可呈腎臟形或橢圓形，或其他形狀。齒部可呈圖示以外的形狀。例如，齒部可呈釘形或不對稱形狀。再者，基板1和頂板2的外表面可粗糙化或加塗，以改進生長入端板內。
彈簧的安裝可直接旋入基板1或頂板2的凸部1b,2b，代替夾持。
阻尼元件12可以其他方式實施，例如用水凝膠墊材，或其他類彈簧，諸如蝸形彈簧或盤式彈簧。
阻尼元件12亦可省略，雖然會減少軸向阻尼的優點。此外，保護軸套可以省略。
1‧‧‧基板
2‧‧‧頂板
1a,2a‧‧‧板部
1b,2b‧‧‧圓筒形凸部
3‧‧‧齒部
4‧‧‧彈簧
5a,5b‧‧‧自由端段
6‧‧‧環形段
7‧‧‧安裝螺釘
8‧‧‧螺釘段
9‧‧‧自由端凹部
10‧‧‧盤形部
11‧‧‧螺紋腔孔
12‧‧‧阻尼元件
13‧‧‧軸套
M‧‧‧中心軸線
w‧‧‧環形段最外部份的寬度
l‧‧‧環形段最外部份的長度
第1圖為本發明椎間盤彌補器具體例之斷面圖；第2圖為第1圖椎間盤彌補器部份斷面之透視側視圖；第3圖為椎間盤彌補器之透視分解圖；第4圖為椎間盤彌補器之透視側視圖；第5圖為用來把彈簧夾持於頂板之椎間盤一部份。
1‧‧‧基板
2‧‧‧頂板
1a,2a‧‧‧板部
1b,2b‧‧‧圓筒形凸部
3‧‧‧齒部
4‧‧‧彈簧
5a,5b‧‧‧自由端段
6‧‧‧環形段
7‧‧‧安裝螺釘
11‧‧‧螺紋腔孔
13‧‧‧軸套
M‧‧‧中心軸線

Claims (11)

  1. 一種椎間盤彌補器，包括：基板(1)；頂板(2)，其中心軸線(M)延伸貫穿基板和頂板的中心；至少二彈簧(4)，配置在基板和頂板之間，彈簧各有環形段(6)和自由端段(5a,5b)；其中自由端之一(5a)連接至基板，另一自由端(5b)連接至頂板；其中環形段在徑向指向背離中心軸線；而且環形段(6)在中心軸線(M)平行方向之最大直徑(d)，使彌補器在安裝狀態時，環形段(6)與基板(1)和頂板(2)有一段距離者。
  2. 如申請專利範圍第1項之椎間盤彌補器，其中彈簧(4)係實質上平坦長條者。
  3. 如申請專利範圍第1項之椎間盤彌補器，其中設有夾持裝置(7)，把自由端段(5a,5b)夾持於基板(1)和頂板(2)者。
  4. 如申請專利範圍第1至3項之一項椎間盤彌補器，其中基板(1)和頂板(2)各有凸部(1b,2b)，與中心軸線共軸，凸部彼此面對者。
  5. 如申請專利範圍第4項之椎間盤彌補器，其中彈簧之自由端段(5a,5b)，夾持於凸部(1b,2b)者。
  6. 如申請專利範圍第1至3項之一項椎間盤彌補器，其中夾持元件(12)配置在基板和頂板之間，夾持元件以彈料為佳者。
  7. 如申請專利範圍第1至3項之一項椎間盤彌補器，其中設有複數環形彈簧(4)，在中心軸線(M)周圍呈圓形配置者。
  8. 如申請專利範圍第1至3項之一項椎間盤彌補器，其中彈簧(4)係由顯示超彈性之材料製成，以鎳鈦等形狀記憶性合金為佳者。
  9. 如申請專利範圍第1至3項之一項椎間盤彌補器，其中屈曲性保護軸套(13)係配置在基板和頂板之間者。
  10. 如申請專利範圍第1至3項之一項椎間盤彌補器，其中基板和頂板在彈簧(4)相反側，包括結合結構(3)，可與椎骨的相鄰端板結合者。
  11. 如申請專利範圍第1至3項之一項椎間盤彌補器，其中自由端係鄰接環形段者。
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