JP5999745B2 - Artificial ankle - Google Patents

Artificial ankle Download PDF

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JP5999745B2
JP5999745B2 JP2009276393A JP2009276393A JP5999745B2 JP 5999745 B2 JP5999745 B2 JP 5999745B2 JP 2009276393 A JP2009276393 A JP 2009276393A JP 2009276393 A JP2009276393 A JP 2009276393A JP 5999745 B2 JP5999745 B2 JP 5999745B2
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talus
ankle joint
tibia
component
stem
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JP2011115440A (en
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中村　孝志
孝志 中村
宣 伊藤
宣 伊藤
孝一 藏本
孝一 藏本
広幸 高橋
広幸 高橋
義裕 野山
義裕 野山
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Teijin Nakashima Medical Co Ltd
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Teijin Nakashima Medical Co Ltd
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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
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4202—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for ankles
    • 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

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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

本発明は、人工足関節に関するものである。   The present invention relates to an artificial ankle joint.

脛骨の遠位端と距骨との間に位置する足関節が変形性関節症や関節リウマチ等で高度の損傷を受けると、他の関節と同様に人工足関節で置換することが行われている。しかし、足関節は、体重のほとんどがかかる荷重関節であるから、距骨の損傷度や骨格に合わせ、最適なサイズの人工関節を置換しないと緩みや沈み込みを起こす。加えて、高荷重下での転がりと滑りの両方が求められることから、人工足関節には特有の機能が求められる。   When the ankle joint located between the distal end of the tibia and the talus is severely damaged due to osteoarthritis or rheumatoid arthritis, it is replaced with an artificial ankle joint like other joints . However, since the ankle joint is a load joint that takes up most of its weight, it will loosen and sink if it is not replaced with an optimally sized artificial joint in accordance with the degree of damage to the talus and the skeleton. In addition, since both rolling and sliding are required under a high load, the artificial ankle joint is required to have a specific function.

現在用いられている人工足関節には次のようなものがある。その一つは、下記特許文献１に示されるところの、前後方向に曲率を有する円柱部を設けて距骨に装着される距骨コンポーネントと、円柱部上に前後方向に摺動可能となるとともに、自身も左右方向に平行移動できて、脛骨に装着される脛骨コンポーネントとからなるシリンドリカルタイプと称されるものである。足関節は、距骨と脛骨が前後及び左右方向に屈曲伸展ができなければならないため、それぞれでこの動きを分担させたものである。しかし左右方向への過度な可動は脱臼を起こす虞がある。
The artificial ankle joints currently in use are as follows. One of them is a talus component that is mounted on the talus by providing a cylindrical part having a curvature in the front-rear direction as shown in the following Patent Document 1, and is slidable in the front-rear direction on the cylindrical part. Can also be translated in the left-right direction, and is called a cylindrical type comprising tibial components attached to the tibia. The ankle joints share these movements because the talus and tibia must be able to flex and extend in the front and rear and left and right directions. However, excessive movement in the left-right direction may cause dislocation.

このため、下記特許文献2には、この左右方向の移動を制限し、前後方向の摺動運動のみにしたコニカルタイプと称するものが提案されている。しかし、これでは動きが拘束され過ぎてしまい、置換後、人工関節設置部に過度のストレスがかかり、緩みを生じることが危惧される。   For this reason, Patent Document 2 below proposes a conical type in which the movement in the left-right direction is limited and only the sliding movement in the front-rear direction is performed. However, in this case, the movement is excessively constrained, and it is feared that after the replacement, excessive stress is applied to the prosthetic joint installation part and loosening occurs.

そこで、下記特許文献3には、脛骨コンポーネントと距骨コンポーネントとの間にポリエチレンインサートを介装し、ポリエチレンインサートの左右移動を規制するとともに、脛骨コンポーネントのポリエチレンインサートに対する平面回動と前後移動をある程度許容しつつ一定限度を超えると規制する案件が提案されている。これにより、上記した問題は解消されたのであるが、ただ、距骨コンポーネントと距骨との固定は距骨コンポーネントの下面にステムを突出してこれを埋め込んだだけである。   Therefore, in Patent Document 3 below, a polyethylene insert is interposed between the tibial component and the talus component to restrict the lateral movement of the polyethylene insert, and to allow a certain degree of plane rotation and forward / backward movement of the tibial component with respect to the polyethylene insert. However, there are proposals to regulate when a certain limit is exceeded. As a result, the above-mentioned problems have been solved. However, the fixation of the talus component and the talus is only performed by protruding the stem on the lower surface of the talus component and embedding it.

特公昭50−43136号公報Japanese Patent Publication No. 50-43136 実公昭62−32021号公報Japanese Utility Model Publication No. 62-32021 特開2002−32021号公報Japanese Patent Laid-Open No. 2002-32021

本発明は、患者の骨格に合わせて最適な距骨ステムの長さや太さのサイズを選択可能とし、距骨側の固定の強化を図ったものである。   According to the present invention, it is possible to select the optimum length and thickness of the talus stem according to the patient's skeleton, and to enhance the fixation on the talus side.

以上の課題の下、本発明は、請求項１に記載した、脛骨の遠位端と、球面状をしている距骨の近位端との間に設けられる人工足関節において、この人工足関節が、脛骨側から順番に、上面が平板状をしており、平坦に骨切りされた脛骨の遠位端の前後の皮質骨を確実に収受するために前後端を上方に折り返したフランジが形成され、かつ、脛骨に突入する脛骨ステムが突設されるとともに、下面に凸部が形成された脛骨コンポーネントと、この凸部を嵌め込む凹部が上面中央に形成されて脛骨コンポーネントの多少の回旋及び左右移動を許容するとともに、底面中央に前後に伸びる下方突出部を有するポリエチレンインサートと、下方突出部を距骨の近位端の形状に沿って前後に彎曲して形成された板状部の上面に凹陥して設けられた溝部で受け入れて前後に摺動可能、かつ、左右への脱落を防ぐ距骨コンポーネントとからなり、距骨コンポーネの下面に距骨から踵骨に亘って斜め後方に挿入される距骨ステムを突出するとともに、距骨ステムがポリエチレンインサートの直下に存在してポリエチレンインサートの後端付近まで延びる基部と、基部に嵌入されて固定される尾部とからなり、基部と脛骨コンポーネントの底面に亘ってリブが形成されていることを特徴とする人工足関節を提供したものである。
Under the above problems, the present invention provides an artificial ankle joint provided between the distal end of the tibia and the proximal end of the spherical talus according to claim 1. However, in order from the tibia side, the upper surface has a flat plate shape, and a flange with the front and back ends folded upward to reliably receive the cortical bone before and after the distal end of the flatly cut tibia And a tibial stem that projects into the tibia is protruded, and a tibial component having a convex portion formed on the lower surface and a concave portion into which the convex portion is fitted are formed at the center of the upper surface, so that the tibial component is slightly rotated and On the upper surface of the plate-like part formed by bending back and forth along the shape of the proximal end of the talus with a polyethylene insert having a downward protrusion extending in the front and back at the center of the bottom and allowing lateral movement In the groove provided in the recess It consists of a talus component that can be inserted and slid back and forth, and prevents it from falling off to the left and right. Is formed of a base portion that is directly below the polyethylene insert and extends to the vicinity of the rear end of the polyethylene insert, and a tail portion that is fitted and fixed to the base portion, and a rib is formed across the base portion and the bottom surface of the tibial component. A characteristic artificial ankle joint is provided.

加えて、この足関節において、請求項２に記載した、尾部の外周に軸方向に沿って複数のフィンが形成されている手段を提供する。
In addition, in this ankle joint, the means described in claim 2 is provided with a plurality of fins formed along the axial direction on the outer periphery of the tail.

請求項1の発明によると、距骨コンポーネントに装着する距骨ステムは患者の骨格に合わせて最適な長さや太さのサイズを選択でき、距骨側の固定の強化を図ることができる。また、この距骨ステムは距骨と踵骨も同時に固定することができ、脆弱な強度の距骨であっても長期に渡る良好な固定性を得ることができる。   According to the invention of claim 1, the talus stem to be mounted on the talus component can be selected to have an optimal length and thickness according to the patient's skeleton, and the fixation on the talus side can be strengthened. In addition, the talus stem can simultaneously fix the talus and the ribs, and even with a weakly strong talus, good fixation over a long period of time can be obtained.

請求項2の手段によると、尾部の固定力がより強化され、請求項3の手段によると、脛骨の前後の皮質骨を必ず脛骨コンポーネント上に設置でき、脛骨の沈み込みを防止することができる。   According to the means of claim 2, the fixing force of the tail is further strengthened, and according to the means of claim 3, the cortical bone before and after the tibia can be always placed on the tibial component, and the tibial subsidence can be prevented. .

人工足関節の斜視図である。It is a perspective view of an artificial ankle joint. 距骨コンポーネントの斜視図である。FIG. 5 is a perspective view of the talar component. 脛骨コンポーネントとポリエチレンインサートの斜視図である。FIG. 6 is a perspective view of a tibial component and a polyethylene insert. 人工足関節を装着した状態の側面図である。It is a side view of the state which mounted | wore the artificial ankle joint. 人工足関節を装着した状態の後面図である。It is a rear view in the state where an artificial ankle joint is attached. 人工足関節を装着した状態の一部断面側面図である。It is a partial cross section side view of the state which mounted | wore the artificial ankle joint.

以下、本発明の実施の形態を図面で参照し説明する。図１は本発明に係る人工足関節の斜視図、図２は距骨コンポーネントの斜視図、図３は脛骨コンポーネントとポリエチレンインサートの斜視図、図４は人工足関節を装着した状態の側面図、図５は後面図、図６は人工足関節を装着した状態の一部断面側面図であるが、足関節は、距骨１の上に脛骨２が載り、両者の接合面で関節を構成しているものである。本発明の人工足関節では、距骨１の近位端に一体となつた距骨コンポーネント３と距骨ステム７が装着され、その上にポリエチレンインサート４を挟んで脛骨コンポーネント５が脛骨２の遠位端に装着されるものになっており、これら４コンポーネントで人工足関節部を構成している。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of an artificial ankle joint according to the present invention, FIG. 2 is a perspective view of a talar component, FIG. 3 is a perspective view of a tibial component and a polyethylene insert, and FIG. 4 is a side view of a state in which the artificial ankle joint is mounted. 5 is a rear view, and FIG. 6 is a partially sectional side view of a state in which an artificial ankle joint is mounted. In the ankle joint, a tibia 2 is placed on the talus 1, and a joint is formed by a joint surface between the two. Is. In the artificial ankle joint according to the present invention, a talus component 3 and a talus stem 7 integrally attached to the proximal end of the talus 1 are mounted, and a tibial component 5 is placed on the distal end of the tibia 2 with a polyethylene insert 4 interposed therebetween. These four components constitute an artificial ankle joint.

距骨１の近位端は凸状の球面をしていることから、距骨コンポーネント３はこの球面に合せて前後左右に湾曲した板状部６を有しており、その下面を距骨１の近位端の表面にあてがつて装着する。なお、板状部６の中央には前後方向に延びる凹陥した溝部６aが形成されているから、全体がこの形状に波打っている。これに伴い、距骨１の近位端もこの溝部６aが嵌まり込むよう骨切り整形され、これによって距骨コンポーネント３が距骨１に対して左右に脱落するのを抑制している。   Since the proximal end of the talus 1 has a convex spherical surface, the talus component 3 has a plate-like portion 6 that is curved to the front, back, left, and right according to this spherical surface. Attach to the end surface. In addition, since the recessed groove part 6a extended in the front-back direction is formed in the center of the plate-shaped part 6, the whole is wavy in this shape. Along with this, the proximal end of the talus 1 is also osteotomized and shaped so that the groove 6 a fits in, thereby preventing the talus component 3 from falling off the left and right with respect to the talus 1.

板状部６の下面には斜め後方に向けて距骨ステムの基部８が突出しており、距骨ステム７はその突出部に取付ける構造となつている。本発明に係る距骨ステム７は、距骨ステムの基部８に連結される尾部９を有している。本例では、距骨ステムの基部８にねじ孔８a
を穿ち、尾部９の先端にこのねじ孔８aに螺入できるねじ部９aを形成しているが、これに限定されるものではなく、要は、尾部９は基部８に対して簡単な操作で強固に結合されるものであればよい。 A base portion 8 of the talus stem protrudes obliquely rearward from the lower surface of the plate-like portion 6, and the talus stem 7 is structured to be attached to the protrusion. The talus stem 7 according to the present invention has a tail 9 which is connected to the base 8 of the talus stem. In this example, a screw hole 8a is formed in the base 8 of the talus stem.
The screw portion 9a that can be screwed into the screw hole 8a is formed at the tip of the tail portion 9; however, the present invention is not limited to this. Any material that is firmly bonded may be used.

なお、本例では、ねじ部９aの後部に凸型テーパー部９b、基部８のねじ孔８aの手前側
には凹型テーパー部８bを形成し、両テーパーで強固な嵌合ができるようにしている。この他、尾部９の外周には軸方向に沿って数本のフィン１０が形成され、基部８の鋭角側と距骨コンポーネント３の下面との間にはリブ１１を張設している（下面の両側方は開放されている）。これは距骨コンポーネント３が距骨１に対して回旋や緩み、沈み込みを防止するためである。 In this example, a convex taper portion 9b is formed at the rear portion of the screw portion 9a, and a concave taper portion 8b is formed on the front side of the screw hole 8a of the base portion 8, so that both tapers can be firmly fitted. . In addition, several fins 10 are formed in the outer periphery of the tail portion 9 along the axial direction, and ribs 11 are stretched between the acute angle side of the base portion 8 and the lower surface of the talar component 3 (the lower surface of the tail portion 9). Both sides are open). This is to prevent the talar component 3 from rotating and loosening with respect to the talar 1 and sinking.

以上により、距骨ステム７を装着した距骨コンポーネント３を距骨１に装着すると、距骨コンポーネント３の下面は距骨１の近位端に密着し、距骨ステム７が距骨１に深く挿入された状態になる。このとき、尾部９は基部８に対して着脱できるものであるから、予め患者の距骨１の骨格を調べておき、距骨コンポーネント３の緩みや沈み込みを起こさない尾部９を選択することができる。この場合の選択の要素としては、長さや太さが考えられる。なお、距骨ステム７は距骨１を通り抜けて踵骨１２まで挿入する方が固定の強化を図る上で好ましい。   Thus, when the talus component 3 with the talus stem 7 is attached to the talus 1, the lower surface of the talus component 3 is in close contact with the proximal end of the talus 1 and the talus stem 7 is inserted deeply into the talus 1. At this time, since the tail portion 9 can be attached to and detached from the base portion 8, the skeleton of the patient's talus 1 can be examined in advance, and the tail portion 9 that does not cause loosening or sinking of the talus component 3 can be selected. In this case, length and thickness can be considered as selection elements. It is preferable to insert the talus stem 7 through the talus 1 and into the radius 12 in order to enhance fixation.

ポリエチレンインサート４は、下面が距骨コンポーネント３の板状部６の曲面に沿うとともに、溝部６aに嵌合する下方突出部１３を有しており、これにより、ポリエチレンインサート４は距骨コンポーネント３に対して前後に摺動できる。また、上面はほぼ平坦な平板状を有しており、中央に前後方向に延びる細長い凹部１４が形成されている。   The polyethylene insert 4 has a lower protrusion 13 that fits into the groove 6 a while the lower surface follows the curved surface of the plate-like portion 6 of the talar component 3, so that the polyethylene insert 4 is in relation to the talar component 3. Can slide back and forth. The upper surface has a substantially flat plate shape, and an elongated recess 14 extending in the front-rear direction is formed at the center.

脛骨コンポーネント５は、下面がポリエチレンインサート４の上面に載る平板状の形状
をしている。そして、上面には脛骨２の中に突入される脛骨ステム１５が突設されており、下面にはポリエチレンインサート４の凹部１４に嵌まり込む凸部１６が形成されたものである。なお、この凸部１６の左右幅はポリエチレンインサート４の凹部１４の左右幅よりは若干狭くしてあり、脛骨コンポーネント５はポリエチレンインサート４に対して多少の回旋及び左右移動が許容されるようになっている。 The tibial component 5 has a flat plate shape whose lower surface is placed on the upper surface of the polyethylene insert 4. A tibial stem 15 that projects into the tibia 2 protrudes from the upper surface, and a convex portion 16 that fits into the concave portion 14 of the polyethylene insert 4 is formed on the lower surface. The left and right width of the convex portion 16 is slightly narrower than the left and right width of the concave portion 14 of the polyethylene insert 4, and the tibial component 5 is allowed to be slightly rotated and moved left and right with respect to the polyethylene insert 4. ing.

さらに、前後両端は上方に折り返されてフランジ１７に形成されている。脛骨コンポーネント５は脛骨２の遠位端を平坦に骨切りしてその上に装着されるものであるが、このとき、前後のフランジ１７はこの間に脛骨２を収受して、脛骨２の前後の皮質骨が必ず脛骨コンポーネント５の上に設置できるようになっている。これは脛骨２の沈み込みを防止する上で重要な要件である。   Further, the front and rear ends are folded upward and formed on the flange 17. The tibial component 5 is a device in which the distal end of the tibia 2 is cut flatly and mounted thereon. At this time, the front and rear flanges 17 receive the tibia 2 during this time, Cortical bone can always be placed on the tibial component 5. This is an important requirement for preventing the tibia 2 from sinking.

以上により、距骨１と脛骨２を要素とする足関節がこのような人工足関節に置換されると、距骨１と脛骨２とは前後方向へ摺動（底背屈）を主運動として若干の左右移動及び回旋も可能になり、生体足関節に近い動きを具現できる。   As described above, when the ankle joint having the talus 1 and the tibia 2 as elements is replaced with such an artificial ankle joint, the talus 1 and the tibia 2 are slightly slid in the front-rear direction (bottom dorsiflexion). Lateral movement and rotation are also possible, and movement close to a living ankle joint can be realized.

以上の動きを円滑に行うためには、距骨コンポーネント３と脛骨コンポーネント５は生体適合性のある金属又はセラミックといった素材が適し(本例ではCo-Cr-Mo合金を採用しているが、これに限定されない)、ポリエチレンインサート４は耐摩耗性の高い超高分子量ポリエチレンが適する。




In order to smoothly more motion, but talar component 3 and the tibial component 5 material suitable such metal or ceramic biocompatible (in this example employs a Co-Cr-Mo alloy, to without limitation), polyethylene insert 4 is highly wear-resistant ultra high molecular weight polyethylene is suitable.




人工足関節がこの４のコンポーネントから構成される利点は、まず第一に、手術時に何らかの理由で最適にセットできなかったり、手術後に生体になじんで最初のセットとは違って来たような場合でも、このずれを４のコンポーネント、特にポリエチレンインサート４が吸収し、不適合な状態にまで至らせない利点がある。第二には、前後回動に加えて若干の左右動及び回旋も可能であるから、生体足関節に近い動きができるとともに、この動きを４のコンポーネントの協働ですることになるから、動きが円滑になり、靭帯や腱に過度の負担をかけないといつた特徴がある。   The advantage that an artificial ankle joint is composed of these four components is, first of all, when it cannot be optimally set for some reason at the time of surgery, or when it has become familiar with the living body after surgery and has come different from the first set However, there is an advantage that this shift is absorbed by the four components, particularly the polyethylene insert 4 and does not lead to an incompatible state. Secondly, in addition to forward / backward rotation, slight left / right movement and rotation are possible, allowing movement close to a living ankle joint, and this movement is the cooperation of four components. It has a characteristic that it becomes smoother and does not place an excessive burden on the ligaments and tendons.

１ 距骨
２ 脛骨
３ 距骨コンポーネント
４ ポリエチレンインサート
５ 脛骨コンポーネント
６ 〃 の板状部
６ａ 〃 の溝部
７ 距骨ステム
８ 距骨ステムの基部
８ａ 基部のねじ孔
８ｂ 凹型テーパー部
９ 距骨ステムの尾部
９ａ 尾部のねじ部
９ｂ 凸型テーパー部
１０ フィン
１１ リブ
１２ 踵骨
１３ 下方突出部
１４ ポリエチレンインサートの凹部
１５ 脛骨コンポーネントの脛骨ステム
１６ 脛骨コンポーネントの凸部
１７ 脛骨コンポーネントのフランジ



Reference Signs List 1 talus 2 tibia 3 talus component 4 polyethylene insert 5 tibial component 6 板 plate
6a 溝 groove portion 7 talus stem 8 talus stem base portion 8a basal screw hole 8b concave taper portion 9 talus stem tail portion 9a tail screw portion 9b convex taper portion 10 fin 11 rib 12 rib 13 downward projecting portion 14 polyethylene insert Recessed portion 15 Tibial component tibial stem 16 Tibial component convex portion 17 Tibial component flange



Claims (2)

脛骨の遠位端と、球面状をしている距骨の近位端との間に設けられる人工足関節において、この人工足関節が、脛骨側から順番に、上面が平板状をしており、平坦に骨切りされた脛骨の遠位端の前後の皮質骨を確実に収受するために前後端を上方に折り返したフランジが形成され、かつ、脛骨に突入する脛骨ステムが突設されるとともに、下面に凸部が形成された脛骨コンポーネントと、この凸部を嵌め込む凹部が上面中央に形成されて脛骨コンポーネントの多少の回旋及び左右移動を許容するとともに、底面中央に前後に伸びる下方突出部を有するポリエチレンインサートと、下方突出部を距骨の近位端の形状に沿って前後に彎曲して形成された板状部の上面に凹陥して設けられた溝部で受け入れて前後に摺動可能、かつ、左右への脱落を防ぐ距骨コンポーネントとからなり、距骨コンポーネの下面に距骨から踵骨に亘って斜め後方に挿入される距骨ステムを突出するとともに、距骨ステムがポリエチレンインサートの直下に存在してポリエチレンインサートの後端付近まで延びる基部と、基部に嵌入されて固定される尾部とからなり、基部と脛骨コンポーネントの底面に亘ってリブが形成されていることを特徴とする人工足関節。 In the artificial ankle joint provided between the distal end of the tibia and the proximal end of the spherical talus, the artificial ankle joint has a flat upper surface in order from the tibia side, In order to reliably receive the cortical bone before and after the distal end of the tibia that has been flattened, a flange with the front and back ends turned upward is formed, and a tibial stem that projects into the tibia is protruded. A tibial component with a convex portion formed on the lower surface and a concave portion into which the convex portion is fitted are formed at the center of the upper surface to allow some rotation and left-right movement of the tibial component, and a downward projecting portion that extends back and forth at the center of the bottom surface. A polyethylene insert having a downward protrusion and a groove provided in a top surface of a plate-like portion formed by bending back and forth along the shape of the proximal end of the talar, and slidable back and forth; and , Drop off to the left and right Consists of a tool talar component, the talus to the lower surface of the talus Component with projecting the talar stem to be inserted obliquely rearward over the calcaneus, to the vicinity of the rear end of the polyethylene insert talus stem exists immediately below the polyethylene insert An artificial ankle joint comprising an extending base portion and a tail portion fitted and fixed to the base portion, wherein a rib is formed across the base portion and the bottom surface of the tibial component. 尾部の外周に軸方向に沿って複数のフィンが形成されている請求項１の人工足関節。
The artificial ankle joint according to claim 1, wherein a plurality of fins are formed along an axial direction on an outer periphery of the tail portion.
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JP2015521951A (en) * 2014-03-25 2015-08-03 ライト メディカル テクノロジー インコーポレイテッドＷｒｉｇｈｔ Ｍｅｄｉｃａｌ Ｔｅｃｈｎｏｌｏｇｙ， Ｉｎｃ． Orthodontic implant reinforcements, systems, and methods
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JP2020531166A (en) * 2017-08-24 2020-11-05 リマコルポラテ・エッセ・ピ・アＬｉｍａｃｏｒｐｏｒａｔｅ Ｓ．Ｐ．Ａ． Ankle arthroplasty system and method
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