JPH0241153A - Artificial joint - Google Patents
Artificial jointInfo
- Publication number
- JPH0241153A JPH0241153A JP19113288A JP19113288A JPH0241153A JP H0241153 A JPH0241153 A JP H0241153A JP 19113288 A JP19113288 A JP 19113288A JP 19113288 A JP19113288 A JP 19113288A JP H0241153 A JPH0241153 A JP H0241153A
- Authority
- JP
- Japan
- Prior art keywords
- stem
- projecting
- shape
- bone
- pin
- 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.)
- Granted
Links
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 229910000599 Cr alloy Inorganic materials 0.000 abstract description 3
- 229910001069 Ti alloy Inorganic materials 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 2
- 239000004568 cement Substances 0.000 description 12
- 210000000689 upper leg Anatomy 0.000 description 6
- 239000002639 bone cement Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 210000003127 knee Anatomy 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 210000004394 hip joint Anatomy 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000000975 bioactive effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 210000001513 elbow Anatomy 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000001624 hip Anatomy 0.000 description 1
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 210000002832 shoulder Anatomy 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
Classifications
-
- 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
- A61F2/36—Femoral heads ; Femoral endoprostheses
-
- 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
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は股、膝、肘、肩などの関節を置換する人工関節
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an artificial joint for replacing joints such as the hip, knee, elbow, and shoulder.
人工関節を構成する部材には、骨の髄腔に挿入し固定す
るステムがある。このステムを骨に対して強固に固定す
るには、ステム自体を生体親和性のあるセラミック材で
構成したものや金属製ステム表面に水酸化アパタイトな
どの生体活性質を被着したものなどが用いられている。One of the components of an artificial joint is a stem that is inserted into and fixed in the medullary cavity of a bone. In order to firmly fix this stem to the bone, the stem itself is made of biocompatible ceramic material, or the surface of the metal stem is coated with a bioactive substance such as hydroxyapatite. It is being
一方Ｃｏ−Ｃｒ合金、チタン合金などの金属製ステムを
髄腔中に、予め骨セメントを充填したところに挿入して
、セメントにより固定する方法もとられている。On the other hand, a method of inserting a stem made of metal such as a Co-Cr alloy or a titanium alloy into a medullary cavity filled with bone cement in advance and fixing the stem with the cement has also been adopted.
このうち、後者の骨セメントによりステムを固定する方
法は手術手技の容易性と初期固定性が良好なことから現
在も広く使用されている。Among these methods, the latter method of fixing the stem with bone cement is still widely used because of its ease of surgical procedure and good initial fixation.
ところが、上記骨セメントによるステムの固定では、セ
メント自体が長期間にわたって性能低下を来し、特に骨
とステムとの間に存在するセメント層の厚さの不均一さ
に起因して部分的に薄くなっている個所に生じた亀裂が
その周辺域にまで次々に伝播して遂には骨とステムとの
接合性が破壊されルースニングが生じ、その結果人工関
節が人体中で機能しなくなるという不都合の発生する恐
れが大きかった。However, when fixing the stem with bone cement, the performance of the cement itself deteriorates over a long period of time, and in particular, the cement layer between the bone and the stem becomes partially thin due to uneven thickness. Cracks that occur in the area where the joint is bent propagate one after another to the surrounding area, eventually destroying the bond between the bone and the stem and causing loosening, which causes the inconvenience that the artificial joint no longer functions in the human body. There was a great possibility that this would occur.
上記のようなルースニング現象が発生しないようにする
ため、人工関節を構成するステムと該ステムが挿入され
た骨との間隔を一定に保ちセメント層を均一にすべくス
テム表面にスペーサの役割を果し、且つ、アンカリング
（係合）作用をもたらすような突起ピンを複数個装着し
たことを特徴とする。In order to prevent the above-mentioned loosening phenomenon from occurring, a spacer is used on the stem surface to maintain a constant distance between the stem that makes up the artificial joint and the bone into which the stem is inserted, and to make the cement layer uniform. Moreover, it is characterized in that a plurality of protruding pins are attached to provide an anchoring (engaging) effect.
以下、図によって本発明実施例を具体的に説明する。 Embodiments of the present invention will be specifically described below with reference to the drawings.
第１図には金属製のステムＳの先端部に骨頭球Ｋを具備
して成る人工関節Ｊを大腿骨Ｂの髄腔中に挿入した状態
を示すが、この人工関節Ｊの主体であるステムＳはＣｏ
−Ｃｒ合金、チタン合金などの金属でもって作られ、適
用する股、膝、肘など部位に応じた大きさ、屈曲形状な
どが決定される。Fig. 1 shows a state in which an artificial joint J comprising a femoral ball K at the tip of a metal stem S is inserted into the medullary canal of a femur B. S is Co
- It is made of metal such as Cr alloy or titanium alloy, and its size, bending shape, etc. are determined depending on the area to which it is applied, such as the crotch, knee, elbow, etc.
図示したステムＳは大腿骨Ｂに挿入固定するに通した屈
曲を有し、このステムＳの表面の所要個所には複数個の
突起ピンＴが植立しである。The illustrated stem S has a bend that allows it to be inserted and fixed into the femur B, and a plurality of projecting pins T are planted at required locations on the surface of the stem S.
この突起ピンＴをステムＳに植立せしめる手法としては
第２図の如くステムＳに螺合したり、第３図のようにテ
ーパー嵌合によるか、あるいは第４図のように接着剤Ｈ
によって突起ピンＴをステムＳにあけた孔に接着固定し
たものであってもよい。また突起ピンＴの突起部の高さ
Ｈは１〜５ｍｍ程度の高さでその形状としては、腕状せ
型（第２図）、台形型（第３図）、球形型（第４図）を
しており、この場合、ステムＳ表面と突起との間には入
込んだ空間りが形成される形状のものがよい。The protruding pin T can be attached to the stem S by screwing it onto the stem S as shown in Fig. 2, by tapered fitting as shown in Fig. 3, or by using adhesive H as shown in Fig. 4.
The protrusion pin T may be adhesively fixed to a hole made in the stem S. The height H of the protrusion of the protrusion pin T is about 1 to 5 mm, and its shape is arm-like (Fig. 2), trapezoidal (Fig. 3), and spherical (Fig. 4). In this case, it is preferable to have a shape in which a space is formed between the surface of the stem S and the protrusion.
これによって、ステムＳの表面形状が凹曲面、凸曲面の
いずれであれ、任意の自由曲面に対して植立可能となる
。This allows the stem S to be planted on any free-form surface, regardless of whether the surface shape is a concave curved surface or a convex curved surface.
さらに、突起ピンＴをステムＳに螺着したり、テーパー
嵌合、接着固定するにあたって、例えばネジ込み量を加
減したり、テーパ角度を変えたものなどを使用すること
によって突起の高さＨを調整することができる。Furthermore, when screwing the protrusion pin T onto the stem S, fitting it with a taper, or fixing it with adhesive, the height H of the protrusion can be adjusted by, for example, adjusting the screw-in amount or changing the taper angle. Can be adjusted.
したがって、髄腔とステムＳとの間隙のバラツキも１１
１整することができる。Therefore, the variation in the gap between the medullary cavity and the stem S is also 11
1 can be adjusted.
また、突起ピンＴの材質としてはステムＳと同一の金属
材が望ましいが、それに限らずセラミック類、プラスチ
ック製のものであってもよく、第１図に示したステムＳ
を大腿骨Ｂに固定するセメントＣと同じ材質のポリメチ
ルメタクリレートでもって突起ピンＴを形成しておくこ
とによって、人体への装着後、突起ピンＴとセメン）Ｃ
とが良好に再結合して優れた結合状態をもたらすことが
できる。なお、上記実施例では人工股関節について説明
したが、これに限らず他の膝、肘、肩などの関節を構成
するステムについても同様に適用できる。The material of the protrusion pin T is preferably the same as that of the stem S, but is not limited to this and may be made of ceramic or plastic.
By forming the protrusion pin T with polymethyl methacrylate, which is the same material as the cement C used to fix the femur B to the femur B, the protrusion pin T and cement C are attached to the human body after being attached to the human body.
can be well recombined to provide an excellent bonding state. Although the above embodiments have been described with respect to an artificial hip joint, the present invention is not limited to this, and can be similarly applied to stems constituting other joints such as knees, elbows, and shoulders.
畝上のように本発明によれば、ステムの表面に複数の突
起ピンを植立することによってスペーサの役割を果たす
突起が形成され、これら突起の高さを調整しておくこと
によってステムが髄腔中に挿入され、セメント固定され
る場合、セメント層の厚さを均一とすることができ、従
って、セメントへの局所的な応力集中が緩和され、セメ
ント層の破壊が回避され、これによってルーズニングを
防ぐことができる。According to the present invention, a plurality of protruding pins are planted on the surface of the stem to form protrusions that serve as spacers, and by adjusting the height of these protrusions, the stem is When inserted into a cavity and cemented, the thickness of the cement layer can be made uniform, thus relieving the local stress concentration on the cement and avoiding destruction of the cement layer, which allows the loose can be prevented.
さらにセメントが突起ピンによって形成される入込んだ
空間に入り込むことによって大きなアンカリング（保合
）効果が得られる。このように、より一層強固にセメン
ト固定することのできるステムをもった人工関節をもた
らすこきができ、人類の福祉向上に寄与するところ大で
ある。Furthermore, a great anchoring effect is obtained by the cement penetrating into the intrusive space formed by the projection pin. In this way, it has been possible to create an artificial joint with a stem that can be more firmly fixed with cement, which will greatly contribute to improving human welfare.
第１図は本発明人工関節としての人工股関節を大腿骨に
装着した状態を示す破断面図、第２図、第３図及び第４
図はともに第１図におけるステムＳへの突起ピンＴの固
定構造例を示す部分断面図である。
Ｊ：人工関節
に：骨頭球
Ｂ：大腿骨
Ｃ：セメント
Ｔ：突起ピンFig. 1 is a broken cross-sectional view showing the state in which the artificial hip joint as the artificial joint of the present invention is attached to the femur, Figs. 2, 3, and 4.
Both figures are partial cross-sectional views showing an example of a structure for fixing the projection pin T to the stem S in FIG. 1. J: For artificial joint: Head ball B: Femur C: Cement T: Protrusion pin
Claims (1)
に複数の突起ピンを装着したことを特徴とする人工関節
。An artificial joint characterized by having a plurality of protruding pins installed at required locations on the surface of a stem that is inserted into a bone cavity and fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63191132A JP2784770B2 (en) | 1988-07-29 | 1988-07-29 | Artificial joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63191132A JP2784770B2 (en) | 1988-07-29 | 1988-07-29 | Artificial joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0241153A true JPH0241153A (en) | 1990-02-09 |
| JP2784770B2 JP2784770B2 (en) | 1998-08-06 |
Family
ID=16269412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63191132A Expired - Fee Related JP2784770B2 (en) | 1988-07-29 | 1988-07-29 | Artificial joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2784770B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6190417B1 (en) | 1999-07-19 | 2001-02-20 | Kyocera Corporation | Femoral prosthesis device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6045356A (en) * | 1983-08-20 | 1985-03-11 | 住友電気工業株式会社 | Artificial joint |
-
1988
- 1988-07-29 JP JP63191132A patent/JP2784770B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6045356A (en) * | 1983-08-20 | 1985-03-11 | 住友電気工業株式会社 | Artificial joint |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6190417B1 (en) | 1999-07-19 | 2001-02-20 | Kyocera Corporation | Femoral prosthesis device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2784770B2 (en) | 1998-08-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |