JPH0450022Y2 - - Google Patents
Info
- Publication number
- JPH0450022Y2 JPH0450022Y2 JP1985000776U JP77685U JPH0450022Y2 JP H0450022 Y2 JPH0450022 Y2 JP H0450022Y2 JP 1985000776 U JP1985000776 U JP 1985000776U JP 77685 U JP77685 U JP 77685U JP H0450022 Y2 JPH0450022 Y2 JP H0450022Y2
- Authority
- JP
- Japan
- Prior art keywords
- phalanx
- shaped
- bone
- fixed
- compressive stress
- 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
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- Prostheses (AREA)
Description
【考案の詳細な説明】
「産業上の利用分野」
本考案は、リユーマチ、骨腫瘍等の病気により
骨機能を果たさなくなつた指関節部を固定する代
替骨として好適に利用される人工固定指骨に関す
るものである。[Detailed description of the invention] "Industrial application field" This invention is an artificial fixed phalanx that is suitably used as a substitute bone for fixing finger joints that have lost their bone function due to diseases such as rheumatoid arthritis and bone tumors. It is related to.
「従来の技術」
従来、この種代替骨は、第２図Ａ及び第２図Ｂ
にそれぞれ平面図及び同図Ｃ−C′線断面図で示す
ように、断面くの字形状もしくは図示しない円孤
形状のものをセラミツクスで製造し、これを生体
の指関節部に生体骨の代わりに挿入して同部を固
定するために使用されていた。``Prior art'' Conventionally, this type of bone substitute
As shown in the plan view and cross-sectional view taken along the line C-C' in the figure, a dogleg-shaped cross section or an arc-shaped one (not shown) is manufactured from ceramics, and this is attached to the finger joint of a living body in place of the living bone. It was used to insert and fix the same part.
「考案が解決しようとする問題点」
上記従来構造は、代替骨の周囲に新たな骨が形
成されにくく、そのため生体との密着性が悪く不
安定であつた。"Problems to be Solved by the Invention" The above-mentioned conventional structure had difficulty in forming new bone around the substitute bone, and therefore had poor adhesion to the living body and was unstable.
本考案はこの問題点を解決し、生体との密着性
が良く安定性の高い人工固定指骨を提供すること
を目的とする。 The purpose of the present invention is to solve this problem and provide an artificially fixed phalange that has good adhesion to the living body and is highly stable.
「問題点を解決するための手段」
側面に長手方向略中央を境として逆方向に複数
切り込まれてなる角錐形の係止用切欠部を、圧縮
応力に対抗する面を有するように形成したところ
にある。``Means for solving the problem'' A plurality of pyramid-shaped locking notches are formed on the side surface in opposite directions with approximately the center in the longitudinal direction as the boundary, and are formed to have a surface that resists compressive stress. It's there.
本考案の手段を図面にもとづいて説明する。 The means of the present invention will be explained based on the drawings.
第１図Ａ及びＢはそれぞれ本考案人工固定指骨
の一実施例に係る平面図及び正面図を示し、１は
少なくとも表面がセラミツクスよりなる縦断正面
くの字形状の人工固定指骨、２，２……２は該人
工固定指骨１の正背両面に平面方向断面のこ歯形
状に復数切り込まれてなる係止用切欠部である。
而して該係止用切欠部２，２……２は人工固定指
骨１の長手方向略中央の折曲部を境として左右逆
方向に切り込まれることを必要とする。 FIGS. 1A and 1B show a plan view and a front view, respectively, of an embodiment of the artificially fixed phalanx of the present invention, in which 1 is an artificially fixed phalange with at least a surface made of ceramics and has a dogleg-shaped longitudinal section; 2, 2... . . 2 is a locking notch formed by making multiple cuts in the dorsal and dorsal surfaces of the artificially fixed phalanx 1 in a sawtooth shape in cross section in the planar direction.
The locking notches 2, 2, . . . 2 need to be cut in left and right directions opposite to each other with the bent portion at approximately the center in the longitudinal direction of the artificially fixed phalanx 1 serving as a boundary.
「作用」
本考案人工固定指骨１を生体の指関節部に装着
すると、略中央の折曲部を境とし指先と指のつけ
根の両側から圧縮応力が加わるが、上記係止用切
欠部２，２……２が折曲部を境として逆方向に切
り込まれていることから、いずれの側からの圧縮
応力にも対抗して骨内に安定的に係止される。而
して係止用切欠部２，２……２と周囲の骨との間
には、装着当初は角錐形の空間が形成されるが、
時間が経過するにつれて新たな骨が形成されて人
工固定指骨１を生体と密着させる。上記の安定係
止作用とこの密着作用とは係止用切欠部２，２…
…２に形成される面のうち上記圧縮応力に対抗す
る面と圧縮応力方向とで角錐形空間においてなす
角度が90度以下である場合に顕著である。また、
本考案人工固定指骨１は表面材質がセラミツクス
である限り生体為害性は無く、全体がセラミツク
ス製である場合はもとより、金属体の表面にセラ
ミツクス製である場合はもとより、金属体の表面
にセラミツクスの被覆膜を施したものでも良い
が、靱性、機械的強度及び生体との密着性の点で
ジルコニア焼結体、ジルコニア・アルミナ複合焼
結体又は特開昭55−140756号公報記載の高強度リ
ン酸カルシウム焼結体が望ましい。"Operation" When the artificially fixed phalanx 1 of the present invention is attached to the finger joint of a living body, compressive stress is applied from both sides of the fingertip and the base of the finger, bordering the bent part at the approximate center. 2...2 is cut in the opposite direction with the bend as a boundary, so it is stably locked in the bone against compressive stress from either side. Therefore, a pyramid-shaped space is formed between the locking notches 2, 2...2 and the surrounding bone at the time of installation, but
As time passes, new bones are formed and the artificially fixed phalanx 1 is brought into close contact with the living body. The above-mentioned stable locking action and this close contact action are the locking notches 2, 2...
This is noticeable when the angle formed in the pyramidal space between the surface opposing the compressive stress and the direction of the compressive stress among the surfaces formed in 2 is 90 degrees or less. Also,
The artificially fixed phalanx 1 of the present invention is not harmful to living organisms as long as the surface material is made of ceramics. A coating film may be applied, but in terms of toughness, mechanical strength, and adhesion to living bodies, zirconia sintered bodies, zirconia-alumina composite sintered bodies, or high strength materials described in JP-A-55-140756 are preferred. Calcium phosphate sintered bodies are preferred.
「実施例」
平均粒径0.1μmのZrO2粉末96モル％及びY2O3
粉末４モル％を混合しラバープレス成形後、温度
1550℃、保持時間１時間の条件で焼成することに
よつて、第１図Ａ及びＢに示す形状の正方晶ジル
コニア80％及び立方晶ジルコニア20％よりなる人
工固定指骨１を製造した。別途、形状が直方体で
あることを除くほか人工固定指骨１と同一条件で
強度測定用試料を製造し、抗折強度を測定したと
ころ、130Kg／mm2であつた。人工固定指骨１を生
体内の指関節部に装着すると、指先と指のつけ根
の両側から加わる圧縮応力により安定的に係止さ
れ、また時間が経過するにつれて係止用切欠部
２，２……２のくぼみに新たな骨が形成され、生
体に対し為害性無く良好に密着した。"Example" 96 mol% ZrO 2 powder with an average particle size of 0.1 μm and Y 2 O 3
After mixing 4 mol% powder and molding with rubber press, the temperature
By firing under the conditions of 1550° C. and holding time for 1 hour, an artificial fixed phalange 1 made of 80% tetragonal zirconia and 20% cubic zirconia and having the shape shown in FIGS. 1A and B was manufactured. Separately, a sample for strength measurement was manufactured under the same conditions as artificially fixed phalanx 1 except that the shape was a rectangular parallelepiped, and the bending strength was measured, and it was 130 Kg/mm 2 . When the artificial fixed phalanx 1 is attached to the finger joint in a living body, it is stably locked due to the compressive stress applied from both sides of the fingertip and the base of the finger, and as time passes, the locking notches 2, 2... New bone was formed in the hollow of No. 2, and it adhered well to the living body without causing any harm.
「考案の効果」
以上のように本考案人工固定指骨は生体の指関
節に為害性無く安定的に係止されるものである。``Effects of the Invention'' As described above, the artificially fixed phalanx of the present invention is stably anchored to the finger joint of a living body without causing any harm.
第１図Ａは本考案の一実施例に係る人工固定指
骨の平面図、同図Ｂは同じく正面図、第２図Ａは
従来の人工固定指骨の平面図、同図Ｂは同じく縦
断正面図である。
１……人工固定指骨、２，２……２……係止用
切欠部。
Figure 1A is a plan view of an artificially fixed phalanx according to an embodiment of the present invention, Figure B is a front view, Figure 2A is a plan view of a conventional artificially fixed phalanx, and Figure B is a longitudinal front view. It is. 1... Artificial fixed phalanx, 2, 2... 2... Locking notch.
Claims (1)
くの字形状もしくは円弧形状の、指関節部を固定
するものにおいて、側面に長手方向略中央を境と
して逆方向に複数切り込まれてなる角錐形の係止
用切欠部を、圧縮応力に対抗する面を有するよう
に形成したことを特徴とする人工固定指骨。 For fixing finger joints with at least a surface made of ceramics and a dogleg-shaped or arc-shaped cross section, the pyramid-shaped locking device has multiple incisions in opposite directions on the side surface approximately at the center in the longitudinal direction. An artificial fixed phalange, characterized in that the notch is formed to have a surface that resists compressive stress.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985000776U JPH0450022Y2 (en) | 1985-01-08 | 1985-01-08 | |
| US07/316,526 US5007932A (en) | 1985-01-08 | 1989-02-27 | Artificial bone joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985000776U JPH0450022Y2 (en) | 1985-01-08 | 1985-01-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61118317U JPS61118317U (en) | 1986-07-25 |
| JPH0450022Y2 true JPH0450022Y2 (en) | 1992-11-25 |
Family
ID=30472928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985000776U Expired JPH0450022Y2 (en) | 1985-01-08 | 1985-01-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0450022Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6115867Y2 (en) * | 1980-03-31 | 1986-05-16 |
-
1985
- 1985-01-08 JP JP1985000776U patent/JPH0450022Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61118317U (en) | 1986-07-25 |
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