JPH07265341A - Stem for fixing artificial joint - Google Patents
Stem for fixing artificial jointInfo
- Publication number
- JPH07265341A JPH07265341A JP6504294A JP6504294A JPH07265341A JP H07265341 A JPH07265341 A JP H07265341A JP 6504294 A JP6504294 A JP 6504294A JP 6504294 A JP6504294 A JP 6504294A JP H07265341 A JPH07265341 A JP H07265341A
- Authority
- JP
- Japan
- Prior art keywords
- stem
- medullary cavity
- outer cylinder
- space
- artificial 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.)
- Pending
Links
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
- A61F2/38—Joints for elbows or knees
-
- 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
-
- 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
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2002/4631—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、人工関節を骨に固定
する場合に、髄腔内に差し込まれる人工関節固定用ステ
ムに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial joint fixing stem that is inserted into a medullary cavity when fixing an artificial joint to bone.
【０００２】[0002]
【従来の技術とその課題】人工関節は、例えば、大腿骨
頭に虚血性懐死が起こったり、リューマチ性関節炎ある
いは変形性関節症が起こったりした場合の治療に使用さ
れている。2. Description of the Related Art Artificial joints are used for the treatment of, for example, ischemic necrosis of the femoral head, rheumatoid arthritis or osteoarthritis.
【０００３】例えば、股関節を人工関節に置き換える場
合、図４に示すように、人工の骨臼カップ１を骨盤Ａに
ネジ固定し、上端に骨臼カップ１に嵌まる人工の骨頭２
を設けたステム３を、大腿骨Ｂの髄腔に挿し込んで固定
するという手術が行われる。For example, when replacing the hip joint with an artificial joint, as shown in FIG. 4, the artificial acetabular cup 1 is screwed to the pelvis A, and the artificial head 2 is fitted to the acetabular cup 1 at the upper end.
An operation is performed in which the stem 3 provided with is inserted and fixed in the medullary cavity of the femur B.
【０００４】ところで、髄腔内に挿し込まれたステム３
が手術後に緩んだりすると、激しい痛みが発生するた
め、従来、この髄腔内に挿し込まれたステム３が緩まな
いように次のような手段が講じられている。By the way, the stem 3 inserted into the medullary cavity
If it is loosened after surgery, severe pain will occur. Therefore, conventionally, the following measures have been taken to prevent the stem 3 inserted into the medullary cavity from loosening.
【０００５】まず、その一つは骨セメントを使用しない
セメントレス法と呼ばれる方法であり、髄腔内に挿し込
むステム３をできるだけ太くして、髄腔内とステム３と
の間にできるだけ隙間が生じないようにして、ステム３
の緩みを防止するという方法である。First, one is a method called a cementless method that does not use bone cement. The stem 3 to be inserted into the medullary cavity is made as thick as possible so that the space between the medullary cavity and the stem 3 is as small as possible. Stem 3
It is a method to prevent the loosening of.
【０００６】しかしながら、太いステム３を髄腔内に無
理に押し込むと、骨が割れやすいという問題と、骨を強
く圧迫するために、骨の虚血性懐死を招くという問題が
ある。However, if the thick stem 3 is forced into the medullary cavity, there are problems that the bone is easily broken and that the bone is strongly pressed, resulting in ischemic necrosis of the bone.
【０００７】また、上記のように、ステム３を髄腔内に
隙間なく挿し込もうとしても、骨の形状には個体差があ
るため、どうしてもステム３と骨の内壁との間には隙間
が発生する。このステム３と骨の内壁との間の隙間を埋
めるために、従来、ＰＭＭＡ（メチルメタクリレート）
セメント、いわゆる骨セメントを髄腔内に注入した後に
ステム３を挿入するという方法もとられている。Further, as described above, even if the stem 3 is inserted into the medullary cavity without any gap, there is a gap between the stem 3 and the inner wall of the bone due to individual differences in the shape of the bone. Occur. In order to fill the gap between the stem 3 and the inner wall of the bone, PMMA (methyl methacrylate) is conventionally used.
A method of injecting cement, so-called bone cement, into the medullary cavity and then inserting the stem 3 is also used.
【０００８】しかしながら、ステムとセメントと骨の三
者は永久に結合することがないから、経時的には緩みが
生じる。However, since the three components of the stem, cement and bone are not permanently bonded, loosening occurs over time.
【０００９】さらに、ＰＭＭＡセメントを粉末と液体か
ら製作する際には、高温を発生するので、この熱によっ
て細胞が破壊され、骨内壁の懐死が起こるという問題が
ある。ＰＭＭＡセメントは、混合後冷めると固形化して
注入不可能となるため、混合直後の熱いセメントを流し
込まざるを得ず、上記のように、骨髄内壁の懐死という
問題が生じ、骨内壁の懐死が起こると、内壁のサイズが
変化するので、これが緩みの一因となる。また、熱傷に
よって懐死した細胞の存在下では感染による骨髄炎を起
こしやすい。Further, when the PMMA cement is produced from powder and liquid, a high temperature is generated, and this heat causes a problem that cells are destroyed and necrosis of the inner wall of the bone occurs. Since PMMA cement solidifies when cooled after mixing and cannot be injected, there is no choice but to pour in hot cement immediately after mixing, resulting in the problem of necrosis of the inner wall of the bone marrow as described above, resulting in necrosis of the inner wall of the bone. When this occurs, the size of the inner wall changes, which contributes to the loosening. In addition, osteomyelitis due to infection is likely to occur in the presence of cells necrotized by the burn.
【００１０】このような問題は、注入固化の際に、熱を
発生しないセメントを使用すると解決できることであ
る。Such a problem can be solved by using a cement that does not generate heat during the injection and solidification.
【００１１】ところで、熱を発生しないセメントとし
て、歯科領域で使用されている生体活性型骨セメントが
ある。By the way, as a cement that does not generate heat, there is a bioactive bone cement used in the dental field.
【００１２】したがって、この生体活性型骨セメントを
ステム３の固定に使用すると、上記の問題点を解決する
ことが可能となると共に、骨内の骨芽細胞が生体活性型
骨セメント内に進入し、セメントを骨化するので、生体
活性型骨セメントと髄腔の内壁面との結合が完全に行わ
れる。Therefore, when this bioactive bone cement is used for fixing the stem 3, it becomes possible to solve the above-mentioned problems and at the same time, osteoblasts in the bone enter into the bioactive bone cement. Since the cement is ossified, the bioactive bone cement and the inner wall surface of the medullary cavity are completely bonded.
【００１３】ところが、生体活性型骨セメントと髄腔の
内壁面との結合が完全に行われても、生体活性型骨セメ
ントとステム３の外壁面とは結合しないので、生体活性
型骨セメントがステム３の外壁面から剥離して、ステム
３がやはり緩むという問題が起こる。However, even if the bioactive bone cement is completely bonded to the inner wall surface of the medullary cavity, the bioactive bone cement and the outer wall surface of the stem 3 are not bonded to each other. There is a problem that the stem 3 is peeled from the outer wall surface of the stem 3 and the stem 3 is also loosened.
【００１４】このステム３の外壁面と生体活性型骨セメ
ントとの剥離を防止する手段としては、ステム３の外壁
面に、溝を形成したり、チタンの小粒を付着したり、あ
るいはハイドロオキシアパタイトの超薄膜コーティング
を施して、生体活性型骨セメントとステム３の外壁面と
の接合力を高めることも考えられるが、このような方法
では剥離を完全に防止できず、ステム３の緩みの問題を
完全に解決できない。As a means for preventing the outer wall surface of the stem 3 from peeling off from the bioactive bone cement, a groove is formed on the outer wall surface of the stem 3, small particles of titanium are attached, or hydroxyapatite is used. It may be possible to increase the bonding strength between the bioactive bone cement and the outer wall surface of the stem 3 by applying the ultra-thin coating of No. 3, but such a method cannot completely prevent peeling and causes a problem of loosening of the stem 3. Can not be solved completely.
【００１５】そこで、この発明は、ステムと髄腔の内壁
面との間の間隙を埋めるために注入された生体活性型骨
セメントが、機械的に剥がれない構造とすることによ
り、手術後のステムの緩みを完全に防止しようとするも
のである。Therefore, according to the present invention, the bioactive bone cement injected to fill the gap between the stem and the inner wall surface of the medullary cavity is structured so as not to be mechanically peeled off. It is intended to completely prevent the loosening of.
【００１６】[0016]
【課題を解決するための手段】この発明は、上記の課題
を解決するために、ステムの髄腔挿入部を、互いの間に
空間部を有する内筒と外筒の二重壁構造とし、上記外筒
全面に、内筒と外筒の間の空間部に連通する貫通孔を多
数形成したものである。In order to solve the above-mentioned problems, the present invention has a medullary cavity insertion portion of a stem having a double wall structure of an inner cylinder and an outer cylinder having a space between them. A large number of through holes communicating with the space between the inner cylinder and the outer cylinder are formed on the entire surface of the outer cylinder.
【００１７】[0017]
【作用】ステムの髄腔挿入部を、髄腔に挿し込んだ状態
で、内筒と外筒の間の空間部に、生体活性型骨セメント
を注入すると、ステムの髄腔挿入部を髄腔の内壁面との
間の隙間に、空間部に注入された生体活性型骨セメント
が外筒の貫通孔を通じて充填される。[Function] When the biomedical bone cement is injected into the space between the inner cylinder and the outer cylinder with the medullary cavity insertion part of the stem inserted in the medullary cavity, the medullary cavity insertion part of the stem is medullary The bioactive bone cement injected into the space is filled in the gap between the inner wall surface of the outer cylinder and the inner wall surface of the outer cylinder through the through hole of the outer cylinder.
【００１８】そして、ステムの髄腔挿入部と髄腔の内壁
面との間の隙間に充填された生体活性型骨セメントが骨
化し、さらに外筒の貫通孔を通じて内筒と外筒の間の空
間部に注入された生体活性型骨セメントが骨化し、この
骨化した新生骨が外筒を包み込むように挾み、新生骨と
外筒とが機械的に結合されるので、ステムに緩みが生じ
ない。Then, the bioactive bone cement filled in the gap between the medullary cavity insertion portion of the stem and the inner wall surface of the medullary cavity is ossified, and further, through the through hole of the outer cylinder, the space between the inner cylinder and the outer cylinder is formed. The bioactive bone cement injected into the space becomes ossified, and the ossified new bone sandwiches the outer cylinder, and the new bone and the outer cylinder are mechanically connected to each other. Does not happen.
【００１９】[0019]
【実施例】以下、この発明の実施例について説明する。Embodiments of the present invention will be described below.
【００２０】図１及び図４は、この発明に係る人工関節
固定用ステムを、人工股関節に使用する例を示してい
る。1 and 4 show an example in which the artificial joint fixing stem according to the present invention is used in an artificial hip joint.
【００２１】この例に示す人工関節固定用ステム３は、
上端に人工股関節の骨頭２が取付けられ、大腿骨Ｂに設
置されるものであり、大腿骨Ｂの髄腔にぴったりと挿し
込まれる形状の髄腔挿入部４と、人工の骨頭２を装着す
る骨頭装着部５とからなる。The stem 3 for fixing the artificial joint shown in this example is
The femoral head 2 of the artificial hip joint is attached to the upper end and is installed in the femur B, and the medullary cavity insertion portion 4 having a shape to be inserted exactly into the medullary cavity of the femur B and the artificial head 2 are attached. It consists of the bone head mounting part 5.
【００２２】上記髄腔挿入部４は、互いの間に空間部６
を有する内筒７と外筒８の二重壁構造に形成され、上記
外筒８の全面には、内筒７と外筒８の間の空間部６に連
通する貫通孔９が多数形成されている。また、上記髄腔
挿入部４の上端部分には、上記空間部６に、生体活性型
骨セメントを注入するための注入口１０が形成されてい
る。上記内筒７の内部は、中空構造でもよいし、中身が
詰まった中実構造でもよい。The medullary cavity insertion portion 4 has a space 6 between them.
Is formed in a double-wall structure of an inner cylinder 7 and an outer cylinder 8, and a large number of through holes 9 communicating with the space 6 between the inner cylinder 7 and the outer cylinder 8 are formed on the entire surface of the outer cylinder 8. ing. An injection port 10 for injecting the bioactive bone cement is formed in the space 6 at the upper end of the medullary cavity insertion portion 4. The inside of the inner cylinder 7 may have a hollow structure or a solid structure filled with contents.
【００２３】上記髄腔挿入部４の空間部６には、内筒７
と外筒８の間隔を保持する支柱１１が部分的に設けられ
ている。An inner cylinder 7 is provided in the space 6 of the medullary cavity insertion portion 4.
A column 11 that holds the space between the outer cylinder 8 and the outer cylinder 8 is partially provided.
【００２４】また、上記ステム３には、生体活性型骨セ
メントが骨化するまでの初期固定をスクリューを挿し込
んで行えるように、スクリューを挿し込む横孔１４を１
〜２個形成しておくことが望ましい。なお、この横孔に
は、タップを切っておく。In addition, the stem 3 is provided with a lateral hole 14 into which the screw is inserted so that the screw can be initially fixed until the bioactive bone cement is ossified.
It is desirable to form ~ 2 pieces. A tap is cut in this lateral hole.
【００２５】上記髄腔挿入部４と骨頭装着部５とからな
るステム３は、ステンレス又はチタン合金など生体に無
害な物質によって形成される。The stem 3 consisting of the medullary cavity insertion portion 4 and the bone head mounting portion 5 is formed of a substance harmless to the living body such as stainless steel or titanium alloy.
【００２６】また、上記の内筒７の外面には、空間部６
に注入した生体活性型骨セメントの保持力をさらに高め
るために、ズレを起こさないように、図５の拡大断面図
に示すように、衝立状の凸部１２を形成しておくことが
望ましい。A space 6 is formed on the outer surface of the inner cylinder 7.
In order to further increase the holding force of the bioactive bone cement injected into the container, it is desirable to form a partition-shaped convex portion 12 as shown in the enlarged sectional view of FIG.
【００２７】上記構造のステム３は、次のようにして、
大腿骨Ｂの髄腔に挿し込んで固定される。The stem 3 having the above structure is as follows.
It is inserted and fixed in the medullary cavity of the femur B.
【００２８】まず、髄腔挿入部４の外面にカバーを被せ
て、上端の注入口１０から生体活性型骨セメントを注入
して、内筒７と外筒８の間の空間部６に生体活性型骨セ
メントを予め密に充填する。この際、ステム３を上下逆
にして、注入口１０が下方に位置するようにして生体活
性型骨セメントを注入すると、隙間なく密に充填するこ
とができる。First, the outer surface of the medullary cavity insertion portion 4 is covered with a cover, and bioactive bone cement is injected through the injection port 10 at the upper end, so that the space 6 between the inner cylinder 7 and the outer cylinder 8 is bioactive. Pre-fill closely with type bone cement. At this time, when the stem 3 is turned upside down and the bioactive bone cement is injected so that the injection port 10 is located below, it is possible to fill densely without a gap.
【００２９】次いで、カバーを外し、髄腔挿入部４を大
腿骨Ｂの髄腔内に挿し込んだ後、上端の注入口１０から
生体活性型骨セメントをさらに注入すると、外筒８の貫
通孔９から生体活性型骨セメントがはみ出し、髄腔挿入
部４の外面、即ち、外筒８の外面と髄腔の内壁面との間
の隙間に生体活性型骨セメントが埋まる。Then, the cover is removed, the medullary cavity insertion portion 4 is inserted into the medullary cavity of the femur B, and bioactive bone cement is further injected from the injection port 10 at the upper end. The bioactive bone cement protrudes from 9 and is embedded in the outer surface of the medullary cavity insertion portion 4, that is, the gap between the outer surface of the outer cylinder 8 and the inner wall surface of the medullary cavity.
【００３０】これにより、髄腔挿入部４と髄腔の内壁面
（骨内膜）との間に充填された生体活性型骨セメントが
骨化し、さらに外筒８の貫通孔９を通じて骨形成細胞が
空間部６に進入し、空間部６内の生体活性型骨セメント
も骨化して、骨化した新生骨によって髄腔挿入部４の外
筒８が包み込まれる。即ち、この結合状態は、図５の拡
大断面図のようになり大腿骨Ｂの骨内膜が温存された状
態で、骨内膜から数ミクロン〜約１ｍｍの範囲内に位置
する外筒８との間の生体活性型骨セメントが骨化し、さ
らに厚みが数ｍｍの外筒８の貫通孔９内と、間隔が数ｍ
ｍの外筒８、内筒７間の空間部６と、内筒７の外面の衝
立状の凸部１２間とにそれぞれ生体活性型骨セメント６
が詰まって、それが骨化するので、大腿骨Ｂに挿し込ま
れたステム３がズレを起こさない。なお、図５におい
て、符号１３は生体活性型骨セメントである。As a result, the bioactive bone cement filled between the medullary cavity insertion portion 4 and the inner wall surface (endosteum) of the medullary cavity is ossified, and the osteogenic cells are further passed through the through hole 9 of the outer cylinder 8. Enter the space 6, the bioactive bone cement in the space 6 is also ossified, and the outer cylinder 8 of the medullary cavity insertion part 4 is wrapped by the ossified new bone. That is, this combined state is as shown in the enlarged cross-sectional view of FIG. The bioactive bone cement between the two is ossified, and the space is several meters within the through hole 9 of the outer cylinder 8 having a thickness of several mm
The space 6 between the outer cylinder 8 and the inner cylinder 7 of m, and the partition 12 on the outer surface of the inner cylinder 7 between the bioactive bone cements 6 respectively.
Is clogged and ossified, the stem 3 inserted into the femur B does not shift. In FIG. 5, reference numeral 13 is a bioactive bone cement.
【００３１】次に、図６及び図７は、この発明に係る人
工関節固定用ステムを人工膝関節に使用する例を示して
いる。Next, FIGS. 6 and 7 show an example in which the artificial joint fixing stem according to the present invention is used in an artificial knee joint.
【００３２】この例に示す人工関節固定用ステム３’
は、膝関節となる屈曲自在なヒンジ部１５の両側に設け
られており、構造は図１乃至図４に示す人工股関節用の
ステム３と基本的に同一であり、同一構成部材について
は同一符号を符している。なお、符号１６は、初期固定
用のスクリューを示している。The artificial joint fixing stem 3'shown in this example
Are provided on both sides of a bendable hinge portion 15 that serves as a knee joint, and the structure thereof is basically the same as that of the stem 3 for artificial hip joints shown in FIGS. 1 to 4, and the same components are designated by the same reference numerals. Is marked. In addition, the code | symbol 16 has shown the screw for initial fixation.
【００３３】[0033]
【発明の効果】以上のように、この発明のステムは、骨
と完全に一体化して結合するので、手術後、長期間を経
過しても、骨との結合が緩まないという効果がある。As described above, since the stem of the present invention is completely integrated and connected with the bone, there is an effect that the connection with the bone does not loosen even after a long period of time after the operation.
【図１】この発明に係るステムの一例を示す斜視図FIG. 1 is a perspective view showing an example of a stem according to the present invention.
【図２】同上の部分縦断面図FIG. 2 is a partial vertical sectional view of the above.
【図３】図２のIII −III 線の断面図FIG. 3 is a sectional view taken along line III-III in FIG.
【図４】ステムの使用状態を示す図FIG. 4 is a diagram showing a usage state of the stem.
【図５】ステムの使用状態を示す拡大縦断面図FIG. 5 is an enlarged vertical sectional view showing a usage state of the stem.
【図６】この発明に係るステムを使用した人口膝関節の
側面図FIG. 6 is a side view of an artificial knee joint using the stem according to the present invention.
【図７】図６の正面図FIG. 7 is a front view of FIG.
３ ステム ４ 髄腔挿入部 ５ 骨頭装着部 ６ 空間部 ７ 内筒 ８ 外筒 ９ 貫通孔 １０ 注入口 １１ 支柱 １２ 凸部 １３ 生体活性型骨セメント １４ 横孔 １５ ヒンジ部 １６ スクリュー 3 Stem 4 Spinal Cavity Insertion Part 5 Bone Head Attachment Part 6 Space Part 7 Inner Cylinder 8 Outer Cylinder 9 Through Hole 10 Injection Port 11 Strut 12 Convex 13 Bioactive Bone Cement 14 Side Hole 15 Hinge Part 16 Screw
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成６年４月５日[Submission date] April 5, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項４[Name of item to be corrected] Claim 4
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項５[Name of item to be corrected] Claim 5
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】図６[Name of item to be corrected] Figure 6
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図６】この発明に係るステムを使用した人工膝関節の
側面図FIG. 6 is a side view of the artificial knee joint using a stem according to the present invention
【手続補正４】[Procedure amendment 4]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図６[Name of item to be corrected] Figure 6
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図６】 [Figure 6]
Claims (5)
の間に空間部を有する内筒と外筒の二重壁構造とし、上
記外筒全面に、内筒と外筒の間の空間部に連通する貫通
孔を多数形成したことを特徴とする人工関節固定用ステ
ム。1. A medullary cavity insertion part to be inserted into a medullary cavity has a double wall structure of an inner cylinder and an outer cylinder having a space portion between each other, and a space between the inner cylinder and the outer cylinder is provided on the entire surface of the outer cylinder. A stem for fixing an artificial joint, characterized in that a large number of through holes communicating with the space portion of the stem are formed.
人工関節固定用ステム。2. The artificial joint fixing stem according to claim 1, wherein the material is a titanium alloy.
間の空間部に、生体活性型骨セメントを注入するための
注入口を形成したことを特徴とする請求項１又は２記載
の人工関節固定用ステム。3. The injection port for injecting bioactive bone cement is formed in the space between the inner cylinder and the outer cylinder at the upper end of the medullary cavity insertion portion. The artificial joint fixing stem according to 2.
む横孔を形成したことを特徴とする請求項１〜３のいず
れかの項に記載の人口関節固定用ステム。4. The artificial joint fixing stem according to claim 1, wherein a transverse hole into which a screw is inserted is formed in the medullary cavity insertion portion.
口関節固定用ステムを、屈曲自在なヒンジ部の両側に設
けたことを特徴とする人口膝関節。5. An artificial knee joint, wherein the artificial joint fixing stem according to any one of claims 1 to 4 is provided on both sides of a bendable hinge portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6504294A JPH07265341A (en) | 1994-04-01 | 1994-04-01 | Stem for fixing artificial joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6504294A JPH07265341A (en) | 1994-04-01 | 1994-04-01 | Stem for fixing artificial joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07265341A true JPH07265341A (en) | 1995-10-17 |
Family
ID=13275516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6504294A Pending JPH07265341A (en) | 1994-04-01 | 1994-04-01 | Stem for fixing artificial joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07265341A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009545413A (en) * | 2006-08-04 | 2009-12-24 | セラムテック アクチエンゲゼルシャフト | Asymmetric construction of artificial compensator components for manipulation and suppression of natural frequencies |
| JP2013501581A (en) * | 2009-08-10 | 2013-01-17 | ロールス−ロイス・コーポレーション | Prosthetic implant and method for forming a prosthetic implant |
-
1994
- 1994-04-01 JP JP6504294A patent/JPH07265341A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009545413A (en) * | 2006-08-04 | 2009-12-24 | セラムテック アクチエンゲゼルシャフト | Asymmetric construction of artificial compensator components for manipulation and suppression of natural frequencies |
| JP2013501581A (en) * | 2009-08-10 | 2013-01-17 | ロールス−ロイス・コーポレーション | Prosthetic implant and method for forming a prosthetic implant |
| US9249055B2 (en) | 2009-08-10 | 2016-02-02 | Rolls-Royce Corporation | Prosthetic implant and method for forming a prosthetic implant |
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