JP3614802B2 - 人工関節 - Google Patents

人工関節 Download PDF

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Publication number
JP3614802B2
JP3614802B2 JP2001256521A JP2001256521A JP3614802B2 JP 3614802 B2 JP3614802 B2 JP 3614802B2 JP 2001256521 A JP2001256521 A JP 2001256521A JP 2001256521 A JP2001256521 A JP 2001256521A JP 3614802 B2 JP3614802 B2 JP 3614802B2
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JP
Japan
Prior art keywords
stem
socket
head
fitting
joint
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2001256521A
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English (en)
Other versions
JP2003061989A (ja
Inventor
義隆 南川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nakashima Propeller Co Ltd
Original Assignee
Nakashima Propeller Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nakashima Propeller Co Ltd filed Critical Nakashima Propeller Co Ltd
Priority to JP2001256521A priority Critical patent/JP3614802B2/ja
Priority to US10/114,788 priority patent/US6811568B2/en
Priority to CH00685/02A priority patent/CH694953A5/fr
Publication of JP2003061989A publication Critical patent/JP2003061989A/ja
Application granted granted Critical
Publication of JP3614802B2 publication Critical patent/JP3614802B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
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    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4241—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for hands, e.g. fingers
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    • 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
    • A61F2/08—Muscles; Tendons; Ligaments
    • A—HUMAN NECESSITIES
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    • 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
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    • A61F2/3804—Joints for elbows or knees for elbows
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    • 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
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    • A61F2002/30362—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit with possibility of relative movement between the protrusion and the recess
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    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
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    • 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
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    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30462—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements retained or tied with a rope, string, thread, wire or cable
    • A—HUMAN NECESSITIES
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    • 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
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    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30507—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
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    • A—HUMAN NECESSITIES
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    • 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
    • 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
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • 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
    • A61F2220/0075—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017—Angular shapes
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017—Angular shapes
    • A61F2230/0021—Angular shapes square
    • 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
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0004—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
    • A61F2250/0012—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting elasticity, flexibility, spring rate or mechanical tension
    • 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
    • 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
    • A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (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)

Description

【０００１】
【発明の属する技術分野】
本発明は、人工指関節や人工肘関節などの人工関節に関する。
【０００２】
【従来の技術】
従来より、例えば、手指の中手指節間関節（以下、ＭＰ関節という）は中手骨と基節骨によって、また、近位指節間関節（以下、ＰＩＰ関節という）は基節骨と中節骨から構成されているが、慢性関節リウマチに代表される関節炎を患うと、特に手足の関節、靭帯、腱が次第に冒され、有痛性の変形と著しい運動制限等が現われるものである。かかる対策として、関節炎より変形した関節部分を人工関節に置換する施術が一般に行われている。
【０００３】
ところで、かかる人工関節としては
ａ．シリコン樹脂で代表される弾性高分子材料により中間の鍔状部を中心としてその両 端にステムを一体形成せしめたもの。
ｂ．ステム付き球状結合端とステム付き球面凹状の結合端とを屈曲自在に組合せた球関 節構造のもの（実公平２−２９９４１号公報、特開平９−３８１２２号公報等参照 ）。
ｃ．各々挿通孔を有するステム付き結合節をピンで屈曲自在に枢着せしめたヒンジ関節 構造のもの（特開平５９−９１９５６号公報、特開平６１−２７６５５３号公報等 参照）。
等が開示されている。
そして、かかる人工関節は、棒状やテ−パ棒状等所要形状のステムを骨髄腔内に挿入せしめると共にボ−ンセメントを介して固定せしめたり、あるいは、所要の骨髄腔内面に合せて形成したステムを骨髄腔内に挿入して固定せしめることにより置換施術するものである。
【０００４】
【発明が解決しようとする課題】
しかしながら、上述の如く構成された従来の人工関節は、関節機能を有効に発揮せしめることが出来る反面、固定方法に問題があり、例えば、テ−パ棒状などのステムを骨髄腔内に挿入すると共にボ−ンセメントを介して固定せしめる従来法は、固定作業が非常に面倒で手間がかかるのみならず、骨髄腔内組織の老化などにより固定力が弱化しやすいおそれがあり、長期的な固定力を保持しずらいものである。また、骨髄腔内面に合せて形成せしめたステムを骨髄腔内に挿入固定せしめる従来法は、ステムの製作が非常に面倒で高コストとなるのみならず、骨髄腔内組織に対する形状的な適合性を欠く場合には従来より設計の面において大きな問題となっている応力集中の危険性があるものである。更に、かかる従来法においては、伸筋腱鞘などの縫合不全に起因するＭＰ関節の伸展障害を生起せしめやすいものである。
【０００５】
本発明は、かかる従来の問題点を一挙に解決し、従来と全く異なる新規な構造でもって骨髄腔内面に適合せしめつつ迅速、かつ、確実に、しかも容易に固定せしめることが出来るのみならず、伸筋腱鞘などの縫合不全に起因するＭＰ関節の伸展障害を有効に防止せしめることが出来る人工関節を提供しようとするものである。
【０００６】
【課題を解決するための手段】
即ち、請求項１記載の発明は、所要のヘッド２とソケット５とが屈曲自在に摺接されると共に、該ヘッド２及びソケット５の自由端に各々ステム９・１６が嵌着され、該各ステム９・１６は軸線方向に沿って螺動自在なロッキングネジ１４が内設されてなるステム基部１０と、該ステム基部１０の先部に突設された弾性を有する両側一対のステム片１５とよりなり、上記ステム片１５内にロッキングネジ１４を圧入せしめることにより外側方に拡開作動せしめて骨髄腔１９・２１内面に圧接固定せしめるべく構成されてなる人工関節であって、上記ヘッド２及びソケット５の一方には屈筋腱鞘２２を繋縛すべく繋縛部材用取付け部４が、同他方には伸筋腱鞘２３を繋縛すべく繋縛部材用取付け部８が各々形成されてなることを特徴とする、人工関節を要旨とするものである。
【０００７】
そして、かかる請求項１記載の発明は、ロッキングネジ１４を螺動して両側のステム片１５内に圧入せしめつつ、ステム片１５を外側方に拡開作動せしめて骨髄腔１９・２１の内周面に強く圧接固定せしめ、ステム基部１０に各々ヘッド２とソケット５を嵌着せしめて屈曲自在に摺接せしめると共に、繋縛部材用取付け部４・８に所要の繋縛部材１７を取付け、該繋縛部材１７でもってヘッド２及びソケット５に屈筋腱鞘２２・伸筋腱鞘２３を繋縛せしめることにより尺側移動を確実に防止せしめることが出来るものである。
【０００８】
請求項２記載の発明は、ヘッド２及びソケット５の自由端に方形体状の嵌合片３・７が突設されると共に、該嵌合片３・７に対応すべくステム基部１０に方形状の嵌合孔１２が形成されてなり、該嵌合孔１２に嵌合片３・７を嵌合せしめて嵌着せしめるべく構成されてなることを特徴とする、請求項１記載の人工関節を要旨とするものである。
【０００９】
そして、かかる請求項２記載の発明は、方形体状の嵌合片３・７を方形状の嵌合孔１２に嵌着せしめるものであるから、ステム９・１６を９０度毎に回転せしめつつ骨髄腔１９
・２１内への固定位置を自由に選択せしめることが出来るのみならず、嵌合いを調節しつつヘッド２とソケット５との固定位置を調節し、側副靱帯の緊張を自由に調節せしめることが出来るものである。
【００１０】
【発明の実施の形態】
以下に、本発明の実施の形態を図面に示す一実施例に基づいて説明する。
図１〜図８は本発明の一実施例を示すもので、同図中、１はＭＰ関節用の人工指関節、２は該人工指関節１を構成する略半球状とされたヘッド、３は該ヘッド２の裏面に突設された方形体状の嵌合片、４は該嵌合片３の基端部に沿ってヘッド２の裏面に形成された繋縛部材用取付け溝である。そして、該ヘッド２はチタン合金やコバルトクロ−ム系合金により形成されている。５は上記ヘッド２に屈曲自在に摺接せしめるべく球面状の凹部６を備えたソケット、７は該ソケット５の裏面に突設された方形体状の嵌合片、８はソケット５の頂部に連通状に形成された両側一対の繋縛部材用取付け孔である。そして、該ソケット５はヘッド２と同様にチタン合金やコバルトクロ−ム系合金により形成せしめてもよいが、好ましくは耐摩耗性に優れたプラスチック、例えば超高分子量ポリエチレンに代表されるエンジニアリングプラスチックにより形成するとよい。
【００１１】
９は前記ヘッド２に嵌着自在とされたチタン合金やコバルトクロ−ム系合金よりなる中手骨用ステム、１０は該中手骨用ステム９を構成する略截頭円錐形状のステム基部、１１は該ステム基部１０の外周面に形成されたネジ山、１２は前記ヘッド２の嵌合片３を嵌合せしめるべくステム基部１０の基端に形成された所要の深さを有する四角形状の嵌合孔、１３は該嵌合孔１２に連通すべくステム基部１０の軸線に沿ってその先端側に形成されたネジ孔、１４は該ネジ孔１３に螺動自在に螺合された所要長の六角穴付きロッキングネジ
、１５は該ロッキングネジ１４に対応すべくステム基部１０の先部に一体に突設された弾性を有する両側一対のテ−パ状ステム片で、該ステム片１５はロッキングネジ１４を螺動して圧入せしめることにより外側方へ拡開自在とされると共に、その外周面は表面加工せしめることなく粗面状に形成されている。１６は前記ソケット５に嵌着自在とされた基節骨用ステムで、該基節骨用ステム１６は中手骨用ステム９より若干短尺状に形成された点が中手骨用ステム９と相違し、他の部分は同一であり、同一符号は同一部分を示す。
その他、１７はワイヤ−などの繋縛部材、１８は中手骨、１９は該中手骨１９の骨髄腔
、２０は基節骨、２１は該基節骨２０の骨髄腔、２２は屈筋腱鞘、２３は伸筋腱鞘を各々示す。
【００１２】
次に、上述の如く構成された実施例の使用方法と作用を説明する。
まず、中手骨１８と基節骨２０との関節部分を切除せしめて各々骨髄腔１９・２１を露出せしめる。しかるのち、中手骨用ステム９と基節骨用ステム１６を各々対応する骨髄腔１９・２１内に挿入せしめると共に、ステム基部１０のネジ山１１を介して骨髄腔１９・２１の開口端縁内にネジ込む。次いで、ロッキングネジ１４を各々螺動せしめつつその先部を両側のステム片１５内に圧入せしめ、ステム片１５の外周面を骨髄腔１９・２１の内周面に強く圧接して固定する。このさい、ステム片１５は弾性を有するから、骨髄腔１９
・２１内を損傷せしめることなく、容易に圧接せしめることが出来、また、ステム片１５の外周面は粗面状に形成されているから、経時的に骨が侵入して生物学的固定を生起せしめることが出来る。
【００１３】
中手骨用ステム９及び基節骨用ステム１６の固定が完了すると、ヘッド２とソケット５とに各々取付け溝４・取付け孔８を介してワイヤ−等の繋縛部材１７を取付ける。次いで
、嵌合片３・７を各々対応する嵌合孔１２に嵌合せしめることによりヘッド２を中手骨用ステム９に、ソケット５を基節骨用ステム１６に各々嵌着せしめると共に、屈曲自在に摺接せしめる。このさい、ヘッド２及びソケット５はその嵌合片３・７を中手骨用ステム９と基節骨用ステム１６の嵌合孔１２に各々嵌着せしめるものであるから、中手骨用ステム９・基節骨用ステム１６を各々９０度毎に回転せしめつつ骨髄腔１９・２１内への固定位置を自由に選択せしめることが出来るのみならず、その嵌合いを適宜調節しつつヘッド２とソケット５との固定位置を調節し、側副靱帯の緊張を自由に調節せしめることが出来る
。しかるのち、繋縛部材１７を介してヘッド２に屈筋腱鞘２２を繋縛せしめると共にソケット５に伸筋腱鞘２３を繋縛せしめる（図６〜図８参照）。このさい、屈筋腱鞘２２及び伸筋腱鞘２３を各々ヘッド２とソケット５に繋縛せしめるものであるから、尺側への移動を確実に防止せしめ、伸筋腱鞘２３などの縫合不全に起因するＭＰ関節の伸展障害を有効に防止せしめることが出来る。屈筋腱鞘２２及び伸筋腱鞘２３の繋縛が終了すると、公知の方法により靱帯等を修復して施術を完了する（図５参照）。
【００１４】
なお、上記実施例において、ヘッド２とソケット５は球関節構造とされているが、これに限定されるものでなく、ヒンジ関節構造に形成せしめてもよいものである。また、屈筋腱鞘２２はヘッド２に、伸筋腱鞘２３はソケット５に各々繋縛するものとされているが、逆に屈筋腱鞘２２をソケット５に、伸筋腱鞘２３をヘッド２に各々繋縛せしめるべく構成せしめてもよいものである。さらに、繋縛部材１７の取付けは取付け溝４及び取付け孔８を介して行なうものとされているが、これに限定されるものでなく、他の公知の取付け構造を介して取付けてもよいものである。なお、上記実施例はＭＰ関節用の人工関節１を示したが、これに限定されるものでなく、例えば、ＰＩＰ関節用の人工指関節、あるいは人工肘関節にも適用せしめることが出来るものである。
【００１５】
【発明の効果】
請求項１記載の発明は上述のように構成されているから、ロッキングネジ１４を螺動して両側のステム片１５内に圧入せしめつつ、ステム片１５を外側方に拡開作動せしめて骨髄腔１９・２１の内周面に強く圧接固定せしめると共に、ステム基部１０に各々ヘッド２とソケット５を嵌着せしめて屈曲自在に摺接せしめることが出来るものであって、その固定作業を迅速、かつ、確実に、しかも容易に行うことが出来るのみならず、螺合するロッキングネジ１４に干渉することなくステム９・１６に直接ヘッド２やソケット５を極めて自然な形でスマ−トに、しかも、容易、かつ、確実に取付けることが出来る。しかも、繋縛部材用取付け部４・８に所要の繋縛部材１７を取付け、該繋縛部材１７でもってヘッド２及びソケット５に屈筋腱鞘２２・伸筋腱鞘２３を繋縛せしめることにより尺側移動を確実に防止せしめることが出来るものであって、ひいては、屈筋腱鞘２２や伸筋腱鞘２３の縫合不全に起因するＭＰ関節等の伸展障害を有効に防止せしめることが出来るものである
。
【００１６】
請求項２記載の発明は上述のように構成されているから、ステム９・１６を９０度毎に回転せしめつつ骨髄腔１９・２１内への固定位置を自由に選択せしめることが出来るのみならず、嵌合を調節しつつヘッド２とソケット５との固定位置を調節し、側副靱帯の緊張を自由に調節せしめることが出来るものである。
【図面の簡単な説明】
【図１】本発明の一実施例を示す分解斜視図である。
【図２】組立てた状態を示す側面図である。
【図３】図２の水平断面図である。
【図４】図２の垂直断面図である。
【図５】ＭＰ関節個所への使用状態を示す側面図である。
【図６】同要部拡大断面図である。
【図７】ヘッド２に屈筋腱鞘２２を繋縛せしめた状態を示す横断面図である。
【図８】ソケット５に伸筋腱鞘２３を繋縛せしめた状態を示す横断面図である。
【符号の説明】
１ ＭＰ関節用人工指関節
２ ヘッド
３ 嵌合片
４ 繋縛部材用取付け溝
５ ソケット
７ 嵌合片
８ 繋縛部材用取付け孔
９ 中手骨用ステム
１０ ステム基部
１２ 嵌合孔
１４ ロッキングネジ
１５ ステム片
１６ 基節骨用ステム
１７ 繋縛部材
１９ 骨髄腔
２１ 骨髄腔
２２ 屈筋腱鞘
２３ 伸筋腱鞘

Claims (2)

  1. 所要のヘッド２とソケット５とが屈曲自在に摺接されると共に、該ヘッド２及びソケット５の自由端に各々ステム９・１６が嵌着され、該各ステム９・１６は軸線方向に沿って螺動自在なロッキングネジ１４が内設されてなるステム基部１０と、該ステム基部１０の先部に突設された弾性を有する両側一対のステム片１５とよりなり、上記ステム片１５内にロッキングネジ１４を圧入せしめることにより外側方に拡開作動せしめて骨髄腔１９・２１内面に圧接固定せしめるべく構成されてなる人工関節であって、上記ヘッド２及びソケット５の一方には屈筋腱鞘２２を繋縛すべく繋縛部材用取付け部４が、同他方には伸筋腱鞘２３を繋縛すべく繋縛部材用取付け部８が各々形成されてなることを特徴とする、人工関節。
  2. ヘッド２及びソケット５の自由端に方形体状の嵌合片３・７が突設されると共に、該嵌合片３・７に対応すべくステム基部１０に方形状の嵌合孔１２が形成されてなり、該嵌合孔１２に嵌合片３・７を嵌合せしめて嵌着せしめるべく構成されてなることを特徴とする
    、請求項１記載の人工関節。
JP2001256521A 2001-08-27 2001-08-27 人工関節 Expired - Fee Related JP3614802B2 (ja)

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CH00685/02A CH694953A5 (fr) 2001-08-27 2002-04-23 Articulation artificielle.

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