JP5557093B2 - Artificial hip joint - Google Patents

Artificial hip joint Download PDF

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JP5557093B2
JP5557093B2 JP2010113600A JP2010113600A JP5557093B2 JP 5557093 B2 JP5557093 B2 JP 5557093B2 JP 2010113600 A JP2010113600 A JP 2010113600A JP 2010113600 A JP2010113600 A JP 2010113600A JP 5557093 B2 JP5557093 B2 JP 5557093B2
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wall
cup
neck
outer edge
hip joint
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JP2011239895A (en
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吉雄 高取
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吉雄 高取
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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
    • A61F2/32—Joints for the hip
    • 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

Description

本発明は、人工股関節に関する。   The present invention relates to an artificial hip joint.

図４に示すように、人工股関節１０１は、骨盤の寛骨臼１０２に取り付ける寛骨臼コンポーネント１０３と、大腿骨１０４側の大腿骨コンポーネント１０５からなる（例えば特許文献１〜６）。人工股関節の構造は多種にわたるが、多くのものでは、寛骨臼コンポーネント１０３のカップ１０６は、寛骨臼１０２に固定する金属シェル１０７Ａとその内部に設置するライナー１０７から構成され、大腿骨コンポーネント１０５はステム１０８と骨頭１０９から構成され、この骨頭１０９はステム１０８から延び出る頚部１１０に固定される。関節運動は、骨頭１０９がライナー１０７の内面と摺動運動をすることで行われる。   As shown in FIG. 4, the artificial hip joint 101 includes an acetabular component 103 attached to the acetabulum 102 of the pelvis and a femoral component 105 on the femur 104 side (for example, Patent Documents 1 to 6). There are various types of artificial hip joints, but in many cases, the cup 106 of the acetabular component 103 is composed of a metal shell 107A that is fixed to the acetabulum 102 and a liner 107 that is placed inside the metal shell 107A. Is composed of a stem 108 and a bone head 109, which is fixed to a neck 110 extending from the stem 108. The joint movement is performed by the bone head 109 sliding with the inner surface of the liner 107.

図５に示すように、通常の屈曲運動が可能なのは、頚部１１０がライナー１０７と衝突するまでの範囲であり、衝突した状態で（図６）さらに屈曲すると骨頭１０９はライナー１０７から離れ（図７）、さらに回転が加わると、骨頭１０９が外れて脱臼する（図８）。   As shown in FIG. 5, the normal bending motion is possible in the range until the neck 110 collides with the liner 107. In the state of collision (FIG. 6), when the head is further bent, the bone head 109 moves away from the liner 107 (FIG. 7). ), When further rotation is applied, the bone head 109 is dislodged and dislocated (FIG. 8).

脱臼が起き易い動作は、和式トイレなどにおける蹲踞（図９）や正座（図１０）である。これらの動作中は図６〜図８の状態となる可能性があり、捻り動作が加わると、前記図８のように脱臼する虞がある。   Operations that tend to cause dislocation are a heel (FIG. 9) and a sitting position (FIG. 10) in a Japanese-style toilet or the like. During these operations, the state shown in FIGS. 6 to 8 may occur, and if a twisting operation is applied, there is a risk of dislocation as shown in FIG.

人工股関節を使用する人は、上述したような動作を避けるように指導されるが、うっかり忘れて脱臼し、病院に搬送される例が後を絶たない。このため人工股関節においては脱臼し難いことが大切な課題である。   A person who uses a hip prosthesis is instructed to avoid the above-described operation, but there are many examples of inadvertently forgetting and dislocation and being transported to a hospital. For this reason, it is an important issue that it is difficult to dislocation in an artificial hip joint.

この課題に対する従来の技術は、（１）骨頭１０９の径と頚部１１０の径の比を大きくすることで可動域を大きくしたもの（図１１）や、（２）ライナー１０７への入口部の径を骨頭１０９の径より小さくし、スナップボタンのように骨頭を拘束するもの（図１２）がある。   Conventional techniques for this problem include (1) a range of motion that is increased by increasing the ratio of the diameter of the head 109 to the diameter of the neck 110 (FIG. 11), and (2) the diameter of the entrance to the liner 107. Is smaller than the diameter of the bone head 109 and restrains the bone head like a snap button (FIG. 12).

特開２００６−１３６４７０号公報JP 2006-136470 A 特開２００５−２７８８７６号公報JP 2005-278876 A 特開２００４−２３０１７５号公報JP 2004-230175 A 特開２００４−６５８７３号公報JP 2004-65873 A 特表２００９−５１４６１４号公報Special table 2009-514614 特表２００２−５２１１２７号公報JP-T-2002-521127

上記（１）の骨頭径と頚部径の比を大きくして可動範囲を大きくする技術では、比を大きくするには、骨頭径を大きくするか、頚部径を小さくすればよい。しかし、日本人は体型が小さいため、骨頭径を欧米人並みに大きくすることはない。その理由は、骨頭径を大きくすると、組み合わせるライナーが薄くなり、耐用性が損なわれるからである。   In the technique (1) in which the ratio of the head diameter to the neck diameter is increased to increase the movable range, the ratio can be increased by increasing the head diameter or decreasing the neck diameter. However, because the Japanese are small, the bone head diameter is not as large as that of Westerners. The reason for this is that when the head diameter is increased, the liner to be combined becomes thinner and the durability is impaired.

次に、上記（２）のスナップボタンのように骨頭を拘束する技術では、可動域が狭くなること、可動域を超えて屈曲することで拘束機構が破壊される虞があること、という２つの欠点がある。   Next, in the technique of constraining the bone head like the snap button of (2) above, there are two possibilities that the range of motion becomes narrow and that the restraint mechanism may be destroyed by bending beyond the range of motion. There are drawbacks.

そこで、本発明は上記した問題点に鑑み、脱臼の発生を抑制することができる人工股関節を提供することを目的とする。   In view of the above-described problems, an object of the present invention is to provide an artificial hip joint that can suppress the occurrence of dislocation.

請求項１に係る発明は、骨盤の寛骨臼に装着可能であって凹状の内壁を有するカップと、大腿骨に装着可能なステムと、前記カップの内壁に摺動する骨頭と、前記ステムと前記骨頭とを連結する頚部とを備えた人工股関節において、前記内壁の開口部の周囲に前記カップの外縁が位置し、前記カップの前記外縁に対応して前記頚部に凹部を設けると共に、前記カップの前記外縁に前記凹部に嵌合する嵌合部を部分的に設け、前記凹部には凹状湾曲面が形成されると共に、前記嵌合部には前記凹状湾曲面とほぼ同形の凸状湾曲面が形成され、前記内壁の底部に対して、前記嵌合部の前記内壁の高さは他の部分の前記内壁の高さより低く、この他の部分の前記内壁の高さに対して、前記凸状湾曲面の頂点の高さが同一か低く形成されていることを特徴とする。 The invention according to claim 1 is a cup that can be attached to the acetabulum of the pelvis and has a concave inner wall, a stem that can be attached to the femur, a bone head that slides on the inner wall of the cup, and the stem. in hip with a neck for connecting the bone head, the positioned outer edge of the cup around the opening of the inner wall, Rutotomoni a recess on the neck corresponding to the outer edge of the cup, the A fitting portion that fits into the concave portion is partially provided on the outer edge of the cup, and a concave curved surface is formed in the concave portion, and a convex curve that is substantially the same shape as the concave curved surface is formed in the fitting portion. A surface is formed, and with respect to the bottom of the inner wall, the height of the inner wall of the fitting portion is lower than the height of the inner wall of the other portion, and the height of the inner wall of the other portion is that the height of the apex of the convex curved surface is formed equal to or lower And butterflies.

請求項１の構成によれば、頚部とカップが衝突する際、頚部の凹部によりステムの可動範囲が広くなり、脱臼し難くなる。   According to the configuration of the first aspect, when the neck and the cup collide, the movable range of the stem is widened by the concave portion of the neck, and dislocation is difficult.

また、請求項１の構成によれば、頚部とカップが衝突する際、頚部の凹部がカップの嵌合部に嵌り、頚部がカップから回旋して脱臼することが抑制される。 Moreover, according to the structure of Claim 1 , when the neck part and the cup collide, the recessed part of a neck part fits into the fitting part of a cup, and it is suppressed that a neck part rotates from a cup and dislocations.

本発明の実施例１を示す断面図である。It is sectional drawing which shows Example 1 of this invention. 本発明の参考例を示す斜視図である。It is a perspective view which shows the reference example of this invention. 同上、断面図である。It is sectional drawing same as the above. 従来例を示す人工股関節の使用状態の斜視図である。It is a perspective view of the use state of the artificial hip joint which shows a prior art example. 同上、人工股関節の可動域を説明する説明図である。It is explanatory drawing explaining the movable range of an artificial hip joint same as the above. 同上、頸部がライナーに衝突した状態の説明図である。It is explanatory drawing of the state which the neck part collided with the liner same as the above. 同上、骨頭がライナーから離れた状態の説明図である。It is explanatory drawing of the state which the bone head separated from the liner same as the above. 同上、脱臼状態の説明図である。It is explanatory drawing of a dislocation state same as the above. 同上、蹲踞状態を示す説明図である。It is explanatory drawing which shows a heel state same as the above. 同上、正座状態の説明図である。It is explanatory drawing of a sitting state same as the above. 同上、人工股関節の説明図であり、図１１（Ａ）より図１１（Ｂ）は骨頭径と頸部径の比が大きいものを示す。FIG. 11 is an explanatory diagram of an artificial hip joint, and FIG. 11 (B) shows a larger ratio of the head diameter to the neck diameter than FIG. 11 (A). 同上、ライナーが骨頭を拘束する人工股関節の説明図である。It is explanatory drawing of the artificial hip joint which a liner restrains a bone head same as the above.

本発明における好適な実施の形態について、添付図面を参照しながら詳細に説明する。なお、以下に説明する実施の形態は、特許請求の範囲に記載された本発明の内容を限定するものではない。また、以下に説明される構成の全てが、本発明の必須要件であるとは限らない。各実施例では、従来とは異なる人工股関節を採用することにより、従来にない人工股関節が得られ、その人工股関節を夫々記述する。   Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, an unconventional hip joint is obtained by adopting an artificial hip joint different from the conventional one, and the artificial hip joint is described respectively.

以下、本発明の実施例について添付図面を参照して説明する。図１は本発明の実施例１を示す。尚、上記図４と同一部分に同一符号を付し、その詳細な説明を省略する。   Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a first embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as said FIG. 4, and the detailed description is abbreviate | omitted.

図１に示すように、人工股関節１は、寛骨臼１０２（図４）に固定される寛骨臼コンポーネント３と、大腿骨１０４（図４）の近位端に固定される大腿骨コンポーネント５とから構成されている。   As shown in FIG. 1, the hip prosthesis 1 includes an acetabular component 3 that is secured to the acetabulum 102 (FIG. 4) and a femoral component 5 that is secured to the proximal end of the femur 104 (FIG. 4). It consists of and.

前記寛骨臼コンポーネント３のカップ６は、寛骨臼１０２に固定する金属シェル７Ａとその内部に設置するライナー７から構成され、前記ライナー７の内壁８に摺動面８Ｓが形成され、この摺動面８Ｓは球面状をなす。尚、前記ライナー７は合成樹脂などからなる。   The cup 6 of the acetabular component 3 includes a metal shell 7A that is fixed to the acetabulum 102 and a liner 7 that is installed inside the metal shell 7A. A sliding surface 8S is formed on the inner wall 8 of the liner 7, and the sliding surface 8S is formed. The moving surface 8S has a spherical shape. The liner 7 is made of synthetic resin or the like.

前記大腿骨コンポーネント５は、ステム１１と、骨頭１２と、これらステム１１と骨頭１２とを連結する頚部１３とを有し、この頚部１３は前記ステム１１の端部より細く、前記骨頭１２を前記ライナー７に嵌め込んで摺動させることにより、股関節として機能する。   The femoral component 5 includes a stem 11, a head 12, and a neck 13 connecting the stem 11 and the head 12. The neck 13 is narrower than the end of the stem 11, and the head 12 is connected to the head 11. By fitting into the liner 7 and sliding, it functions as a hip joint.

前記大腿骨コンポーネント５の頚部１３に、前記ライナー７の外縁９に対応して凹部１４を設け、この凹部１４には凹状湾曲面１４Ａが形成されている。尚、外縁９は、内壁８の開口部の周囲に位置する。また、前記ライナー７の前記外縁９には、前記凹部１４と対応した堤状の嵌合部１５を設け、この嵌合部１５には凸状湾曲面１５Ａが形成されており、この凸状湾曲面１５Ａは前記凹状湾曲面１４Ａとほぼ同形である。また、摺動面８Ｓの底部に対して、嵌合部１５の内壁８の高さｈは他の部分の内壁８の高さＨより低く（ｈ＜Ｈ）、この他の部分の内壁８の高さＨに対して、嵌合部１５の高さｈ１(凸状湾曲面１５Ａの頂点)が同一か低く形成されている（Ｈ＝＞ｈ１）。   A concave portion 14 is provided in the neck portion 13 of the femoral component 5 corresponding to the outer edge 9 of the liner 7, and a concave curved surface 14 </ b> A is formed in the concave portion 14. The outer edge 9 is located around the opening of the inner wall 8. Further, the outer edge 9 of the liner 7 is provided with a bank-like fitting portion 15 corresponding to the concave portion 14, and the fitting portion 15 is formed with a convex curved surface 15A. The surface 15A is substantially the same shape as the concave curved surface 14A. Further, the height h of the inner wall 8 of the fitting portion 15 is lower than the height H of the inner wall 8 of the other portion (h <H) with respect to the bottom portion of the sliding surface 8S. The height h1 of the fitting portion 15 (the apex of the convex curved surface 15A) is the same or lower than the height H (H => h1).

前記嵌合部１５は、前記外縁９の全周でなくてもよく、この例では部分的に設けている。また、前記頚部１３の凹部１４と前記外縁９の嵌合部１５は、生活慣習上、頚部１３とライナー７の衝突が起き易い位置に設ける。   The fitting portion 15 may not be the entire circumference of the outer edge 9 and is provided partially in this example. Further, the concave portion 14 of the neck portion 13 and the fitting portion 15 of the outer edge 9 are provided at a position where the neck portion 13 and the liner 7 are likely to collide for daily living.

そして、頚部１３とライナー７が衝突すると、頚部１３の凹部１４がライナー７の嵌合部１５に嵌り、頚部１３がライナー７から回旋して脱臼することが抑制される。   When the neck portion 13 and the liner 7 collide, the concave portion 14 of the neck portion 13 fits into the fitting portion 15 of the liner 7, and the neck portion 13 is prevented from rotating and dislocation from the liner 7.

このように頚部１３に凹部１４がある場合、より深い屈曲まで可能であり、衝突しても凹部１４がライナー７の外縁９と整合することで滑りや回旋を抑制する。   Thus, when the neck part 13 has the recessed part 14, even deeper bending is possible, and even if it collides, the recessed part 14 will align with the outer edge 9 of the liner 7, and a slip and rotation will be suppressed.

骨頭１２がライナー７の内壁８から浮き上がるだけでは脱臼は起こらず、外周方向への移動が加わる必要がある。これに対して、本発明は、凹部１４と嵌合部１５の嵌合により、前記外周方向への移動が抑制されるため、脱臼を抑制することができる。   Dislocation does not occur if the bone head 12 is lifted from the inner wall 8 of the liner 7 and it is necessary to add movement in the outer circumferential direction. On the other hand, since the movement to the said outer peripheral direction is suppressed by the fitting of the recessed part 14 and the fitting part 15, this invention can suppress dislocation.

また、従来の製品の可動域を減少させることがない。さらに、凹部１４と嵌合部１５とを設定することにより、人工股関節１を使用する人の生活動作に合わせた設定を行うことができる。   Further, the range of motion of the conventional product is not reduced. Furthermore, by setting the concave portion 14 and the fitting portion 15, it is possible to make a setting in accordance with the life operation of the person who uses the artificial hip joint 1.

このように本実施例では、骨盤の寛骨臼１０２に装着可能であって凹状の内壁８を有するカップ６と、大腿骨１０４に装着可能なステム１１と、カップ６の内壁８に摺動する骨頭１２と、ステム１１と骨頭１２とを連結する頚部１３とを備えた人工股関節１において、カップ６のライナー７の外縁９に対応して頚部１３に凹部１４を設けたから、頚部１３とカップ６が衝突する際、頚部１３の凹部１４によりステム１１の回動範囲が広くなり、脱臼し難くなる。   Thus, in this embodiment, the cup 6 having the concave inner wall 8 that can be attached to the acetabulum 102 of the pelvis, the stem 11 that can be attached to the femur 104, and the inner wall 8 of the cup 6 slide. In the artificial hip joint 1 including the head 12 and the neck 13 connecting the stem 11 and the head 12, the neck 13 and the cup 6 are provided with a recess 14 in the neck 13 corresponding to the outer edge 9 of the liner 7 of the cup 6. , The range of rotation of the stem 11 is widened by the recess 14 of the neck 13, and dislocation is difficult.

また、このように本実施例では、内壁８の開口部の周囲にカップ６の外縁９が位置し、カップ６の外縁９に対応して頚部１３に凹部１４を設けると共に、カップ６の外縁９に凹部１４に嵌合する嵌合部１５を部分的に設け、凹部１４には凹状湾曲面１４Ａが形成されると共に、嵌合部１５には凹状湾曲面１４Ａとほぼ同形の凸状湾曲面１５Ａが形成され、内壁８の底部に対して、嵌合部１５の内壁８の高さｈは他の部分の内壁８の高さより低く、この他の部分の内壁８の高さＨに対して、凸状湾曲面１５Ａの頂点の高さｈ１が同一か低く形成されているから、頚部１３とカップ６が衝突する際、頚部１３の凹部１４がカップ６の嵌合部１５に嵌り、頚部１３がカップ６から回旋して脱臼することが抑制される。 Further, in the present embodiment thus, positioned outer edge 9 of the cup 6 around the opening of the inner wall 8, Rutotomoni corresponding to the outer edge 9 of the cup 6 a recess 14 provided in the neck 13, the outer edge of the cup 6 9 is partially provided with a fitting portion 15 that fits into the concave portion 14, and the concave portion 14 is formed with a concave curved surface 14A, and the fitting portion 15 has a convex curved surface that is substantially the same shape as the concave curved surface 14A. 15A is formed, and with respect to the bottom of the inner wall 8, the height h of the inner wall 8 of the fitting portion 15 is lower than the height of the inner wall 8 of the other part, and with respect to the height H of the inner wall 8 of this other part. Since the height h1 of the apex of the convex curved surface 15A is the same or low, when the neck portion 13 and the cup 6 collide, the concave portion 14 of the neck portion 13 fits into the fitting portion 15 of the cup 6, and the neck portion 13 Rotation from the cup 6 is suppressed.

参考例
図２〜３は本発明の参考例を示し、上記実施例１と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、この例では、凹部１４が、外縁９の幅に対応して形成されており、該凹部１４のステム１１側に、前記カップ６の外周縁６Ｇに間隔をおいて対向するようにして係合する係合部１６が形成されている。また、参考例における人工股関節１では、外縁９に嵌る凹部１４が頚部１３に設けられていることから、大腿骨コンポーネント５を可動させた際、当該凹部１４の凹み分だけ外縁９が当たり難くなるので、その分だけステム１１の可動範囲を広げることができ、従来よりも脱臼が起こり難くなる。 Reference Example FIGS. 2 to 3 show a reference example of the present invention. The same reference numerals are given to the same parts as those in the first embodiment, and detailed description thereof will be omitted. In this example, the recess 14 has an outer edge. The engaging portion 16 is formed on the side of the stem 11 of the recess 14 so as to be opposed to the outer peripheral edge 6G of the cup 6 with a gap. . Moreover, in the artificial hip joint 1 in the reference example , since the concave portion 14 fitted to the outer edge 9 is provided in the neck portion 13, when the femoral component 5 is moved, the outer edge 9 is difficult to hit by the concave portion of the concave portion 14. Therefore, the movable range of the stem 11 can be expanded by that amount, and dislocation is less likely to occur than in the past.

さらに、このように凹部１４が外縁９の全体に外嵌するようにして遊嵌するため、脱臼がより起こり難くなる。尚、この例では、金属シェル７Ａの外周縁６Ｇがカップ６の外周縁である。   Furthermore, since the concave portion 14 is loosely fitted so as to be fitted over the entire outer edge 9, dislocation is less likely to occur. In this example, the outer peripheral edge 6G of the metal shell 7A is the outer peripheral edge of the cup 6.

このように本参考例では、凹部１４はカップ６の外周縁６Ｇに係合する係合部１６を有するから、頚部１３の凹部１４がカップ６の外縁９に嵌ると共に、凹部１４の係合部１６がカップ６の外周縁６Ｇに係合することにより、脱臼の発生がより抑制される。 Thus, in this reference example, since the recess 14 has the engaging portion 16 that engages with the outer peripheral edge 6G of the cup 6, the recess 14 of the neck portion 13 fits the outer edge 9 of the cup 6, and the engaging portion of the recess 14 Since 16 engages with the outer peripheral edge 6G of the cup 6, the occurrence of dislocation is further suppressed.

また、参考例上の効果として、上述した実施例１のような嵌合部１５（図１）を、ライナー７の外縁９に形成する必要がないため、ライナー７の構造が簡易なものとなる。 Further, as an effect on the reference example, it is not necessary to form the fitting portion 15 (FIG. 1) as in the first embodiment described above on the outer edge 9 of the liner 7, so that the structure of the liner 7 becomes simple. .

尚、本発明は、本実施例に限定されるものではなく、本発明の要旨の範囲内で種々の変形実施が可能である。例えば、本発明は金属シェルのないカップに適用可能であることはいうまでもない。   The present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, it goes without saying that the present invention is applicable to a cup without a metal shell.

１ 人工股関節
２ 寛骨臼
３ 寛骨臼コンポーネント
４ 大腿骨
５ 大腿骨コンポーネント
６ カップ
７Ａ 金属シェル
７ ライナー
９ 外縁
１１ ステム
１２ 骨頭
１３ 頚部
１４ 凹部
１４Ａ 凹状湾曲面
１５ 嵌合部
１５Ａ 凸状湾曲面
１６ 係合部
ｈ 嵌合部の内壁の高さ
Ｈ 他の部分の内壁の高さ
ｈ１ 凸状湾曲面の頂点の高さ DESCRIPTION OF SYMBOLS 1 Artificial hip joint 2 Acetabulum 3 Acetabular component 4 Femur 5 Femoral component 6 Cup 7A Metal shell 7 Liner 9 Outer edge 11 Stem 12 Bone head 13 Neck part 14 Recessed part
14A concave curved surface 15 fitting portion
15A Convex curved surface 16 Engagement part
h Height of inner wall of fitting part
H Height of the inner wall of other parts
h1 Height of the apex of the convex curved surface

Claims (1)

骨盤の寛骨臼に装着可能であって凹状の内壁を有するカップと、大腿骨に装着可能なステムと、前記カップの内壁に摺動する骨頭と、前記ステムと前記骨頭とを連結する頚部とを備えた人工股関節において、
前記内壁の開口部の周囲に前記カップの外縁が位置し、前記カップの前記外縁に対応して前記頚部に凹部を設けると共に、前記カップの前記外縁に前記凹部に嵌合する嵌合部を部分的に設け、前記凹部には凹状湾曲面が形成されると共に、前記嵌合部には前記凹状湾曲面とほぼ同形の凸状湾曲面が形成され、
前記内壁の底部に対して、前記嵌合部の前記内壁の高さは他の部分の前記内壁の高さより低く、この他の部分の前記内壁の高さに対して、前記凸状湾曲面の頂点の高さが同一か低く形成されていることを特徴とする人工股関節。 A cup that can be attached to the acetabulum of the pelvis and has a concave inner wall, a stem that can be attached to the femur, a bone head that slides on the inner wall of the cup, and a neck that connects the stem and the bone head In an artificial hip joint with
And the outer edge position of the cup around the opening of the inner wall, Rutotomoni a recess on the neck corresponding to the outer edge of the cup, a fitting portion fitted to the concave portion on the outer edge of the cup A concave curved surface is formed in the concave portion, and a convex curved surface having substantially the same shape as the concave curved surface is formed in the fitting portion.
The height of the inner wall of the fitting portion is lower than the height of the inner wall of the other portion relative to the bottom of the inner wall, and the height of the inner wall of the other portion is lower than the height of the inner wall of the other portion. An artificial hip joint characterized in that the heights of the vertices are the same or lower .
JP2010113600A 2010-05-17 2010-05-17 Artificial hip joint Expired - Fee Related JP5557093B2 (en)

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CH675822A5 (en) * 1988-09-06 1990-11-15 Sulzer Ag
FR2638350B1 (en) * 1988-10-28 1993-03-05 Breard Francis HIP PROSTHESIS WITH LARGE INNER TRAVEL
US5916270A (en) * 1997-06-06 1999-06-29 New York Society For The Ruptured And Crippled Maintaining The Hospital For Special Surgery Hip replacement
US6802866B2 (en) * 2001-09-19 2004-10-12 Ceramtec Ag Innovative Ceramic Engineering Hip joint prosthesis with abutment-protected prosthesis shaft

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