JP2000325372A - Ceramic caput sphere and artificial caput using the same - Google Patents
Ceramic caput sphere and artificial caput using the sameInfo
- Publication number
- JP2000325372A JP2000325372A JP11141692A JP14169299A JP2000325372A JP 2000325372 A JP2000325372 A JP 2000325372A JP 11141692 A JP11141692 A JP 11141692A JP 14169299 A JP14169299 A JP 14169299A JP 2000325372 A JP2000325372 A JP 2000325372A
- Authority
- JP
- Japan
- Prior art keywords
- head
- ceramic
- caput
- artificial
- stem
- 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
- A61F2/32—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
Landscapes
- 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)
- Materials For Medical Uses (AREA)
- Prostheses (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、セラミック製骨頭
球及びこれを用いた人工骨頭に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic head ball and an artificial head using the same.
【０００２】[0002]
【従来の技術】図５は、従来の人工股関節１００を模式
的に示したものである。この人工股関節１００は人工骨
頭１とソケット５１から構成され、人体への置換後は人
工骨頭１をなす骨頭球３がソケット５１の凹球面内で摺
動するように構成されている。そして、この人工骨頭１
は、略球状に形成された骨頭球３と金属製ステム３１と
から構成され、骨頭球３の中央に向けて奥細状に凹設さ
れた円錐台形状のテーパ孔５に、ステム３１のテーパ部
３２を嵌合（挿入）して一体化されてなるものである。
このような人工骨頭１は、ステム３１の角状部３４が大
腿骨Ｆの骨切りによって形成された孔内に骨セメントＳ
を介して挿入され、固定される。また人工骨頭１を摺動
自在に受座するソケット５１は、多くはポリエチレン製
であり、臼蓋骨Ｍ側に骨セメントＳを介して固定され
る。2. Description of the Related Art FIG. 5 schematically shows a conventional hip joint 100. As shown in FIG. The artificial hip joint 100 includes an artificial head 1 and a socket 51. After replacement with a human body, the head 3 forming the artificial head 1 slides within the concave spherical surface of the socket 51. And this artificial head 1
Is formed of a substantially spherical head 3 and a metal stem 31, and the tapered hole 5 of the stem 31 is formed in a truncated conical tapered hole 5 that is recessed toward the center of the head 3. The part 32 is fitted (inserted) and integrated.
Such an artificial bone head 1 has a bone cement S in which a horn portion 34 of the stem 31 is formed in the hole formed by the osteotomy of the femur F.
Is inserted and fixed. The socket 51 for slidably receiving the artificial head 1 is mostly made of polyethylene, and is fixed to the acetabular bone M via the bone cement S.
【０００３】このような人工骨頭１を構成する骨頭球３
は、従来、ステンレス鋼やＣｏ−Ｃｒ鋼、チタン合金等
の生体親和性及び耐久性の高い金属製のものが多く使用
されていた。しかし、こうした金属製のものはポリエチ
レン製のソケット５１を摩耗し、その摩耗粉がステム３
１の角状部３４と大腿骨Ｆ体との隙間に入り込み、骨Ｆ
を溶かしてしまうといった問題があった。そこで近年で
はそのような摩耗を生じさせにくいアルミナやジルコニ
ア等のセラミック製骨頭球３が多く使用されるようにな
っている。ところが、セラミック製骨頭球３といえど
も、ポリエチレン製のソケット５１の摩耗を皆無とする
ことはできない。しかし、セラミック製骨頭球３はその
ような摩耗粉の発生量の低減に効果があり、とくにその
外径（直径）を小さくするのが摺動（摩擦）面積も小さ
くなり有効とされている。[0003] The head ball 3 constituting such an artificial head 1
Heretofore, those made of metal having high biocompatibility and durability such as stainless steel, Co-Cr steel, and titanium alloy have been used in many cases. However, such a metal thing wears the polyethylene socket 51, and the abrasion powder forms the stem 3.
1 enters the gap between the horn portion 34 and the femur F body, and the bone F
There was a problem that it melted. Therefore, in recent years, ceramic head balls 3 made of alumina, zirconia, or the like, which hardly cause such abrasion, have been used in many cases. However, even with the ceramic head ball 3, the wear of the polyethylene socket 51 cannot be completely eliminated. However, the ceramic head ball 3 is effective in reducing the generation amount of such wear powder, and it is particularly effective to reduce the outer diameter (diameter) because the sliding (friction) area is also reduced.
【０００４】また、人工股関節１００を必要とする患者
の多くは統計上、中高年の女性である。そして、このよ
うな患者のうち日本人は比較的小柄なため、臼蓋骨Ｍの
大きさも小さく、したがってこれに固定されるソケット
５１もあまり大きくできない。このため、従来の比較的
大径のセラミック製骨頭球３に代えて、その直径を２６
ｍｍ以下とする試みがある。[0004] Also, most patients who need the hip prosthesis 100 are statistically middle-aged women. In addition, among such patients, Japanese are relatively small, so that the size of the acetabular bone M is small, and therefore, the socket 51 fixed thereto is not so large. For this reason, instead of the conventional relatively large-diameter ceramic head ball 3, the diameter is 26
mm or less.
【０００５】一方、このような人工股関節１００には普
通の日常生活においても体重の数倍の荷重が作用するこ
とがあるなどより、高度の耐久性や強度が要求されてい
る。例えばＦＤＡ(U.S. Food and Drug Administratio
n) ガイドラインでは、セラミック製骨頭球について、
その圧縮破壊荷重を最低２０００ｋｇｆとし、かつ試料
数５個の平均で４７００ｋｇｆ以上あることを要求して
いる。On the other hand, such artificial hip joints 100 are required to have a high degree of durability and strength because a load several times the weight may be applied even in ordinary daily life. For example, FDA (US Food and Drug Administratio
n) The guidelines state that for ceramic heads,
It is required that the compression breaking load be at least 2000 kgf and that the average number of the five samples be 4700 kgf or more.
【０００６】[0006]
【発明が解決しようとする課題】ところが、従来外径が
２６ｍｍ以下のセラミック製骨頭球（以下、骨頭球とも
いう）では、こうした強度を確保できないばかりか、こ
れを大きく下回るものもあるといった問題があった。ま
た従来は骨頭球の強度アップのためにはその肉厚を重視
していたが、本願発明者は、そのテーパ孔５におけるス
テム３１のテーパ部３２との接触面積を大きくし、テー
パ孔５の内周面が受圧する単位荷重を分散して小さくし
た方が、むしろ強度アップが図られると考えた。However, in the case of a conventional ceramic head ball having an outer diameter of 26 mm or less (hereinafter also referred to as a head head ball), not only such strength cannot be ensured, but also there is a problem that there is a case where the strength is much lower than this. there were. Further, conventionally, the thickness of the head cap has been emphasized in order to increase the strength of the head cap, but the present inventor has increased the contact area of the tapered hole 5 with the tapered portion 32 of the stem 31 to increase the tapered hole 5. We thought that it would be possible to increase the strength by dispersing and reducing the unit load received by the inner peripheral surface.
【０００７】そこで、本願発明者は骨頭球３のテーパ孔
５の深さや径を種々変更した骨頭球試料を作り、それぞ
れに合うステム（代用品）をテーパ嵌合して組み立て、
その各試料について圧壊試験をしたところ、テーパ孔５
の深さをある程度確保しかつテーパ孔５における内周面
の面積つまりステム３１のテーパ部３２との接触面積を
ある程度確保したものでは、骨頭球３の肉厚が従来の基
準よりも多少薄めになるとしても、むしろ強度アップが
図られることを知るに至った。本発明はかかる知見に基
いてなされたもので、その目的とするところは、小径の
セラミック製骨頭球においてその強度アップを図ること
にある。Therefore, the inventor of the present invention makes head head sphere samples in which the depth and diameter of the tapered hole 5 of the head head ball 3 are variously changed, and assembles them by taper fitting stems (substitutes) corresponding to each.
When a crush test was performed on each sample, a taper hole 5
Of the inner surface of the tapered hole 5, that is, the contact area with the tapered portion 32 of the stem 31, the thickness of the head 3 is somewhat thinner than the conventional standard. Even so, I came to know that strength could be improved. The present invention has been made based on such findings, and an object of the present invention is to increase the strength of a ceramic head ball having a small diameter.
【０００８】[0008]
【課題を解決するための手段】前記課題を解決するため
請求項１に記載の発明は、ステムをテーパ嵌合するため
のテーパ孔を有するセラミック製骨頭球であって外径が
２６ｍｍ以下のものにおいて、該テーパ孔の中心軸に沿
う深さが７ｍｍ以上で、該テーパ孔の内周面の面積が９
０ｍｍ２以上となるように形成したことを特徴とする。According to the first aspect of the present invention, there is provided a ceramic head ball having a tapered hole into which a stem is tapered and having an outer diameter of 26 mm or less. In the above, the depth along the central axis of the tapered hole is 7 mm or more, and the area of the inner peripheral surface of the tapered hole is 9 mm.
It is characterized by being formed so as to be 0 mm 2 or more.
【０００９】この場合において、前記テーパ孔の中心軸
と内周面の母線とのなすテーパ角は１〜４度とするとよ
い。この程度のテーパ角とすると、嵌合時におけるテー
パ孔の中心軸方向の寸法精度上の問題もなく、結合力の
強いテーパ嵌合が得られるためである。In this case, the taper angle between the center axis of the tapered hole and the generatrix of the inner peripheral surface is preferably 1 to 4 degrees. This is because if the taper angle is set to such a degree, there is no problem in the dimensional accuracy of the tapered hole in the central axis direction at the time of fitting, and a tapered fitting with a strong coupling force can be obtained.
【００１０】本発明のセラミック製骨頭球に、ステムを
テーパ嵌合して人工骨頭が得られるが、このものにおい
ては、骨頭球とステムとは嵌合前（自由状態）におい
て、前記テーパ孔のテーパ角度θ１と、前記ステムのテ
ーパ部のテーパ角度θ２とを次のようにするとよい。す
なわち、前記骨頭球のテーパ孔における中心軸と内周面
の母線とのなすテーパ角度をθ１とし、前記ステムにお
けるテーパ部の中心軸と外周面の母線とのなすテーパ角
度をθ２としたとき、θ１をθ２より大とし、かつ、θ
１とθ２との差を１度以下とするのが好ましい。An artificial head can be obtained by tapering the stem into the ceramic head ball of the present invention. In this case, before the head head ball and the stem are fitted to each other (in a free state), the artificial head is fitted into the tapered hole. The taper angle θ1 and the taper angle θ2 of the tapered portion of the stem may be as follows. That is, when the taper angle between the center axis of the tapered hole of the head cap and the generating line of the inner peripheral surface is θ1, and the taper angle between the center axis of the tapered portion of the stem and the generating line of the outer peripheral surface is θ2, θ1 is larger than θ2, and θ
It is preferable that the difference between 1 and θ2 be 1 degree or less.
【００１１】[0011]
【発明の実施の形態】以下、図１〜図３に基づいて本発
明に係るセラミック製骨頭球及びこれを用いた人工骨頭
について説明する。図１は本発明のセラミック製骨頭球
の実施形態の正面中央断面図、図２は図１の骨頭球に嵌
合する金属製ステムの正面図、図３は図１の骨頭球と図
２の金属製ステムで組み立てた人工骨頭の部分断面正面
図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ceramic head according to the present invention and an artificial head using the same will be described below with reference to FIGS. FIG. 1 is a front center sectional view of an embodiment of the ceramic head ball of the present invention, FIG. 2 is a front view of a metal stem fitted to the head head ball of FIG. 1, and FIG. FIG. 3 is a partial cross-sectional front view of an artificial bone head assembled with a metal stem.
【００１２】図１中３は、セラミック製骨頭球であり、
略球状をなし、その略中心に向かってステム３１の嵌合
のため奥細で円錐台形状に凹設されたテーパ孔５を備え
ている。このテーパ孔５はその中心軸Ｊ１と内周面５ａ
の母線とのなすテーパ角度θ１が１〜４度で、同中心軸
Ｊ１に沿う深さＨが７ｍｍ以上とされている。このテー
パ孔５の最小径部より奥所には拡径された大径部７が形
成され、ステム３１との確実なテーパ嵌合が確保される
ように形成されている。なお、テーパ孔５の開口端部の
外周縁には一定の幅で円環状をなす平坦部８を備えてい
る。In FIG. 1, reference numeral 3 denotes a ceramic head ball.
It has a substantially spherical shape, and is provided with a tapered hole 5 recessed in a deep and frustoconical shape for fitting the stem 31 toward the substantially center thereof. The tapered hole 5 has a central axis J1 and an inner peripheral surface 5a.
Is 1 to 4 degrees, and the depth H along the central axis J1 is 7 mm or more. A large-diameter portion 7 whose diameter is expanded behind the minimum-diameter portion of the tapered hole 5 is formed so as to ensure a reliable taper fitting with the stem 31. The outer peripheral edge of the open end of the tapered hole 5 is provided with an annular flat portion 8 having a constant width.
【００１３】このような骨頭球３は、そのテーパ孔５に
対し、図２に示したように、大腿骨（図示せず）へ嵌入
される角状部３４と骨頭球３のテーパ孔５へ嵌合される
先細り状のテーパ部３２を備えた金属製ステム３１が、
そのテーパ部３２を骨頭球３のテーパ孔５へ圧入され、
図３に示したような人工骨頭１となる。As shown in FIG. 2, such a head 3 is inserted into a horn 34 inserted into a femur (not shown) and a tapered hole 5 of the head 3. The metal stem 31 provided with the tapered tapered portion 32 to be fitted is
The tapered portion 32 is pressed into the tapered hole 5 of the head ball 3,
The artificial head 1 is as shown in FIG.
【００１４】次にこのような骨頭球３の実施形態につい
てそのテーパ孔５の中心軸Ｊ１に沿う深さＨを代えてテ
ーパ孔５の内周面積の異なる試料をつくり、これに図４
に示したように、ステム３１のテーパ部３２と同一のテ
ーパ部３２をもち同素材（ステンレス合金）からなるテ
ーパ体３０を同テーパ孔５に圧入した試料を作成して強
度試験をした。ただし、セラミック製骨頭球３はＺｒＯ
２を主成分とするセラミック焼結体であり、ＺｒＯ２粉
体に燒結助剤を添加してなる原料粉体をプレス成形した
後、焼成して表面を研磨してなるものである。Next, with respect to the embodiment of such a head 3, samples having different inner peripheral areas of the tapered hole 5 were prepared by changing the depth H along the center axis J 1 of the tapered hole 5, and FIG.
As shown in (1), a sample having the same tapered portion 32 as that of the stem 31 and having a tapered body 30 made of the same material (stainless alloy) pressed into the tapered hole 5 was prepared and subjected to a strength test. However, the ceramic head 3 is made of ZrO
2 is a ceramic sintered body mainly composed of ZrO 2 , which is obtained by press-forming a raw material powder obtained by adding a sintering aid to ZrO 2 powder, and then firing and polishing the surface.
【００１５】強度試験は図４に示したように、ステム３
１と同様に形成されたテーパ体３０のテーパ部３２を人
工骨頭１のテーパ孔５に圧入してなる試料を、円錐形状
の受面（凹部）ＵのあるブロックＶの同受面Ｕに銅製の
リングＲを介し、テーパ体３０が上部に位置するように
載置し、テーパ体３０に鉛直に圧縮荷重Ｐをかけ、セラ
ミック製骨頭球３に亀裂が入るまで（破壊開始まで）徐
々に荷重を増大し、破壊開始時の荷重を測定した。結果
は表１「テーパ孔の深さ（Ｈ）及び内周面積（Ａ）と破
壊荷重の関係」に示した通りである。なお試料数は各５
であり、結果はその平均値である（以下同様）。In the strength test, as shown in FIG.
A sample formed by press-fitting the tapered portion 32 of the tapered body 30 formed in the same manner as in Example 1 into the tapered hole 5 of the artificial head 1 is placed on the receiving surface U of the block V having the conical receiving surface (recess) U by copper. Is placed on the tapered body 30 via the ring R, and a compressive load P is applied vertically to the tapered body 30 until the ceramic head ball 3 is cracked (until the fracture starts). And the load at the start of fracture was measured. The results are as shown in Table 1 "Relationship between Breakdown Load and Depth (H) and Inner Perimeter Area (A) of Tapered Hole". The number of samples was 5 for each.
And the result is the average value (the same applies hereinafter).
【００１６】ただし、表１では骨頭球３が外径２２ｍｍ
であり、そのテーパ孔５へのテーパ体３０のテーパ部３
２の圧入においては、テーパ部３２の外周面がテーパ孔
５の内周面５ａの全体に接触するようにした。However, in Table 1, the head ball 3 has an outer diameter of 22 mm.
And the tapered portion 3 of the tapered body 30 into the tapered hole 5
In the press-fitting of No. 2, the outer peripheral surface of the tapered portion 32 was in contact with the entire inner peripheral surface 5a of the tapered hole 5.
【００１７】[0017]
【表１】 [Table 1]
【００１８】この結果から分かるように骨頭球３の外径
が２２ｍｍのものにおいて、テーパ孔５の中心軸Ｊ１に
沿う深さＨが７ｍｍ以上で、テーパ孔５の内周面５ａの
面積(ステム３１との接触面積)Ａが９０ｍｍ２以上とな
るように形成した本発明範囲のもの（試料Ｎｏ．２）で
は、破壊荷重が比較例（試料Ｎｏ．１、３）より５５０
ｋｇ以上も大きい。これは、嵌合時におけるテーパ孔５
の内周面５ａとテーパ部３２との接触面積が適切に確保
され、荷重時において骨頭球３のテーパ孔５の内周面５
ａがステムのテーパ部の外周面から受ける単位荷重が適
度に分散されて小さくなったためと考えられる。しかも
比較例ではＦＤＡガイドラインの基準平均値４７００ｋ
ｇｆ以下であったのに対し、本発明範囲のものでは同基
準値を上まわっていることからも、その効果が実証され
ている。As can be seen from this result, in the case where the outer diameter of the head 3 is 22 mm, the depth H along the central axis J1 of the tapered hole 5 is 7 mm or more, and the area of the inner peripheral surface 5a of the tapered hole 5 (stem) In the case of the present invention (sample No. 2) formed so that A (contact area with 31) is 90 mm 2 or more, the breaking load is 550 compared to the comparative example (samples No. 1 and 3).
Larger than kg. This is because the tapered hole 5 at the time of fitting is
The contact area between the inner peripheral surface 5a and the tapered portion 32 is appropriately secured, and the inner peripheral surface 5 of the tapered hole 5 of the
It is considered that the unit load received by a from the outer peripheral surface of the tapered portion of the stem was appropriately dispersed and reduced. Moreover, in the comparative example, the standard average value of the FDA guideline of 4700k
gf or less, whereas those in the range of the present invention exceeded the reference value, thus demonstrating the effect.
【００１９】次にセラミック製骨頭球３の外径が２６ｍ
ｍのものについて同様の試験をした。結果は表２「テー
パ孔の深さ（Ｈ）及び内周面積（Ａ）と破壊荷重の関
係」に示した通りである。Next, the outer diameter of the ceramic head ball 3 is 26 m.
A similar test was conducted for m. The results are as shown in Table 2 "Relationship between breaking depth (H) and inner peripheral area (A) of tapered hole and breaking load".
【００２０】[0020]
【表２】 [Table 2]
【００２１】表２より比較例（試料Ｎｏ．４、６）では
ＦＤＡガイドラインの基準平均値４７００ｋｇｆ以下で
あったのに対し、テーパ孔５の中心軸Ｊ１に沿う深さＨ
が７ｍｍ以上で、テーパ孔５の内周面５ａの面積が９０
ｍｍ２以上となるように形成した本発明範囲のもの（試
料Ｎｏ．５）では同基準値を大きく上回った。According to Table 2, the comparative example (samples Nos. 4 and 6) had a FDA guideline average value of 4700 kgf or less, whereas the tapered hole 5 had a depth H along the central axis J1.
Is 7 mm or more, and the area of the inner peripheral surface 5a of the tapered hole 5 is 90 mm.
In the range of the present invention (sample No. 5) formed so as to be not less than mm 2 , the reference value was greatly exceeded.
【００２２】前記においてセラミック製骨頭球３は、Ｚ
ｒＯ２を主成分とするセラミック焼結体において具体化
したが、本発明の小径の骨頭球はこれに限定されるもの
ではない。セラミック製骨頭球には、この他、Ａｌ２Ｏ
３、Ｓｉ３Ｎ４、或いはＳｉＣを主成分とするセラミッ
ク焼成体から形成されたものがあり、それぞれの材質に
よって若干の強度差はあるものの、上記の結果からして
同様に強度アップが図られることが期待される。また、
上記においては人工股関節において説明したが、本発明
はこれに限定されることなく広く人工関節において適用
できる。In the above, the ceramic head ball 3 is made of Z
Although embodied in a ceramic sintered body containing rO 2 as a main component, the small-diameter head cap of the present invention is not limited to this. In addition to the ceramic head ball, Al 2 O
3. There is a ceramic fired body containing Si 3 N 4 or SiC as a main component, and although there is a slight difference in strength depending on each material, the strength is similarly increased from the above results. It is expected. Also,
Although the above description has been made with respect to an artificial hip joint, the present invention is not limited to this and can be widely applied to an artificial joint.
【００２３】[0023]
【発明の効果】以上説明したように本発明のセラミック
製骨頭球によれば次のような効果がある。すなわち、外
径が２６ｍｍ以下のものにおいてテーパ孔の中心軸に沿
う深さが７ｍｍ以上で、該テーパ孔の内周面５ａの面積
が９０ｍｍ２以上となるように形成したため、外径が２
６ｍｍ以下といった小径のセラミック製骨頭球でありな
がら、ステムを嵌合、圧入して人工骨頭としたときでも
その強度アップが図られる。このため、骨頭球の破損防
止に極めて有効であり、安全で耐久性の高い人工関節用
の人工骨頭をなすことができる。As explained above, the ceramic head ball of the present invention has the following effects. That is, in the case where the outer diameter is 26 mm or less, the depth along the central axis of the tapered hole is 7 mm or more, and the area of the inner peripheral surface 5a of the tapered hole is 90 mm 2 or more.
Even though the head is made of a ceramic head with a small diameter of 6 mm or less, the strength is increased even when the stem is fitted and pressed into an artificial head. For this reason, it is extremely effective in preventing damage to the head cap, and a safe and durable artificial head cap for an artificial joint can be formed.
【００２４】そしてこのように小径のセラミック製骨頭
球は、ポリエチレン製のソケットの摩耗粉の発生の低減
に有効であるため、骨を溶かす問題の解消にも寄与す
る。さらに、このようなセラミック製骨頭球を用いた人
工骨頭によればとくに大荷重のかかりやすい人工股関節
に適用する場合でも、同セラミック製骨頭球が破損しに
くくなるため、とくに比較的小柄な患者にとって福音と
なる。Since the ceramic head ball having such a small diameter is effective in reducing the generation of abrasion powder of the polyethylene socket, it also contributes to solving the problem of dissolving bone. Further, according to the artificial head using such a ceramic head, even when applied to an artificial hip joint where a large load is likely to be applied, the ceramic head is unlikely to be damaged. Gospel.
【図１】本発明のセラミック製骨頭球の実施形態の正面
中央断面図。FIG. 1 is a front center sectional view of an embodiment of a ceramic head ball of the present invention.
【図２】図１の骨頭球に嵌合する金属製ステムの正面
図。FIG. 2 is a front view of a metal stem fitted to the head of FIG. 1;
【図３】図１の骨頭球と図２の金属製ステムで組み立て
た人工骨頭の部分断面正面図。3 is a partial cross-sectional front view of an artificial head assembled with the head ball of FIG. 1 and the metal stem of FIG. 2;
【図４】本発明のセラミック製骨頭球の強度試験の説明
用断面図。FIG. 4 is a sectional view for explaining a strength test of the ceramic head ball of the present invention.
【図５】従来の人工股関節を説明する模式図。FIG. 5 is a schematic diagram illustrating a conventional artificial hip joint.
１ 人工骨頭 ３ セラミック製骨頭球 ５ テーパ孔 ５ａ テーパ孔の内周面 ３１ ステム Ｈ テーパ孔の中心軸に沿う深さ Ｊ１ テーパ孔の中心軸 Reference Signs List 1 artificial head 3 ceramic head 5 ball taper hole 5a inner peripheral surface of taper hole 31 stem H depth along center axis of taper hole J1 center axis of taper hole
Claims (3)
を有するセラミック製骨頭球であって外径が２６ｍｍ以
下のものにおいて、 該テーパ孔の中心軸に沿う深さが７ｍｍ以上で、該テー
パ孔の内周面の面積が９０ｍｍ２以上となるように形成
したことを特徴とするセラミック製骨頭球。1. A ceramic head ball having a tapered hole for taper-fitting a stem and having an outer diameter of 26 mm or less, wherein a depth along a central axis of the tapered hole is 7 mm or more, and A ceramic head ball formed such that the area of the inner peripheral surface of the hole is 90 mm 2 or more.
軸と内周面の母線とのなすテーパ角度を１〜４度とした
ことを特徴とするセラミック製骨頭球。2. The ceramic head ball according to claim 1, wherein the taper angle between the center axis of the tapered hole and the generatrix of the inner peripheral surface is 1 to 4 degrees.
球に、ステムをテーパ嵌合してなる人工骨頭。3. An artificial head having a stem taperedly fitted to the ceramic head of claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11141692A JP2000325372A (en) | 1999-05-21 | 1999-05-21 | Ceramic caput sphere and artificial caput using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11141692A JP2000325372A (en) | 1999-05-21 | 1999-05-21 | Ceramic caput sphere and artificial caput using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000325372A true JP2000325372A (en) | 2000-11-28 |
Family
ID=15298004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11141692A Pending JP2000325372A (en) | 1999-05-21 | 1999-05-21 | Ceramic caput sphere and artificial caput using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000325372A (en) |
-
1999
- 1999-05-21 JP JP11141692A patent/JP2000325372A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7393362B2 (en) | Hip prosthesis | |
| USRE37964E1 (en) | Femoral prosthesis employing a small ceramic ball | |
| US5362311A (en) | Artificial hip joint | |
| CA1061951A (en) | Artificial head assembly for an articulated joint between two bones | |
| AU1123897A (en) | Acetabular cup body prosthesis | |
| CN101039636A (en) | Metallic bearings for joint replacement | |
| Piconi et al. | On the fracture of a zirconia ball head | |
| JP3857784B2 (en) | Ceramic head bones and bone head system for artificial joints | |
| WO2005032429A1 (en) | Implant bore insert | |
| JP2000514342A (en) | Zirconia femoral head kit for hip prosthesis | |
| CN102488573B (en) | Artificial acetabulum made of discrete ceramic cylinders | |
| JPH10216162A (en) | Artificial joint corrector | |
| JP2000325372A (en) | Ceramic caput sphere and artificial caput using the same | |
| EP0578322A2 (en) | Acetabulum for an artificial hip joint | |
| JP2000225132A (en) | Artificial prosthesis for femur | |
| JP4426702B2 (en) | Artificial hip joint | |
| JP3838720B2 (en) | Artificial hip joint | |
| JPH0628676B2 (en) | Artificial hip joint | |
| Swanson | Engineering considerations in the design of double-cup hip replacement prostheses | |
| JP2579218B2 (en) | Manufacturing method of artificial head | |
| JP5848537B2 (en) | Hip prosthesis cup and prosthetic hip joint using the same | |
| WO2007069250A2 (en) | Faceted long bone head prosthesis | |
| JPH10165429A (en) | Ceramic caput ball and caput ball stem of artificial articulation | |
| Richter¹ et al. | > IMPROVING THE RELIABILITY OF THE CERAMIC-ON-CERAMIC WEAR COUPLE IN THR | |
| JP3786532B2 (en) | Artificial joint |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20040811 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20040921 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20050208 |