CN104203164B - 用于对陶瓷的用于髋关节假体的球头进行检验的方法 - Google Patents

用于对陶瓷的用于髋关节假体的球头进行检验的方法 Download PDF

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CN104203164B
CN104203164B CN201380009825.3A CN201380009825A CN104203164B CN 104203164 B CN104203164 B CN 104203164B CN 201380009825 A CN201380009825 A CN 201380009825A CN 104203164 B CN104203164 B CN 104203164B
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M·弗洛尔
C·乌普曼
H·贝特马林
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    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
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Abstract

本发明涉及用于对陶瓷的用于髋关节假体的球头(3)进行检验的方法，所述球头有一带有夹锥角为γ的锥形侧面的接纳空间(8)和一锥入口(7)可供使用且为了进行检验而向接纳空间(8)的区域施加压力。为了使所有被检验的球头(3)即使处在活体内重大的倾斜负载状态下仍旧不受损伤地保持功能就绪状态，建议，仅锥入口(7)的区域被施授垂直于球头(3)的纵轴线走向的径向力。

Description

用于对陶瓷的用于髋关节假体的球头进行检验的方法
技术领域
本发明涉及用于对陶瓷的用于髋关节假体的球头进行检验的方法，所述球头有一带有夹锥角为γ的锥形侧面的接纳空间和一锥入口可供使用并且为了进行检验而向接纳空间的区域施加压力。
背景技术
模块化的陶瓷的球头的所要求的最低强度通过所谓复核试验（100%检验）来加以保证。就此而言球头的锥形的区域得到液压负载。DE4411508C2对此有所描述。
对于模块化的球头的专用的几何尺寸而言在活体内重大的倾斜负载状态下会在锥入口的范围内出现过高的受力。
按照目前的认知状态，仍旧没有一种检验模块化球头的锥入口并在针对该区域的100%检验的范围内确保必要的最低强度的方法（复核试验）。100%检验意味着在复核试验中带有误差的球头被毁，从而只有无瑕疵的球头才能通过复核试验。
发明内容
本发明的任务在于，改善用于对陶瓷的用于髋关节假体的球头进行检验的方法，使得所有被检验的球头即使处在活体内重大的倾斜负载状态下仍旧不受损伤地保持功能就绪状态。
按照本发明这个任务如下解决：球头有一带有夹锥角为γ的锥形侧面的接纳空间和一锥入口可供使用且为了进行检验而向所述接纳空间的区域施加压力，其特征在于，仅所述锥入口的区域被施授垂直于所述球头的纵轴线走向的径向力。
按本发明的用于对陶瓷的用于髋关节假体的球头进行检验的方法，所述球头有一带有夹锥角为γ的锥形侧面的接纳空间和一锥入口可供使用且为了进行检验而向所述接纳空间的区域施加压力，其特征在于，仅所述锥入口的区域被施授垂直于所述球头的纵轴线走向的径向力。所有被检验的球头由此即使处在活体内重大的倾斜负载状态下也不受损伤地功能就绪。
为了进行检验优选把一锥角为α的锥形的套管压入到接纳空间中，其中锥角α大于夹锥角γ。以此只是锥入口承受负荷。
在一个实施方式中，锥角α在7°至30°优选18°的范围内选择且夹锥角γ和锥角α之间的差在最小2°和最大25°之间选择。
已经表明，优选该套管在其周面上封闭且优选由铜合金优选黄铜形成。
优选把带有一与套管共同的锥角α的锥形的压模沿轴向以力F压入到该套管中。
在一个实施方式中保证，套管和压模之间的摩擦小于套管和球头之间的摩擦。
该压模优选用钢制造并优选被表面硬化。
在一个实施方式中为了进行检验而向该套管的内表面施加液压压力。
一种用于实施根据本发明的方法的装置的特征在于，该装置具有支座、锥形的套管和压模，其中全都布置在一个共同的纵轴线上且该套管和该压模能够在纵轴线上移动，其中套管布置在压模和支座之间而且锥角α大于被检验的球头的夹锥角γ。
该套管优选具有与压模的锥角相同的锥角α。
附图说明
图1示出髋关节假体的植入到上股骨中的杆；
图2示出包括复核试验的机械的加载单元的髋关节假体。
具体实施方式
下将参照附图进一步阐述本发明。
本发明描述针对锥入口7（见图1）的区域的复核试验，其中通过沿径向作用的力在锥入口7的区域内产生高的受力。这可以以液压或机械方式进行。图1示出髋关节假体的植入到上股骨中的杆9。在杆9的杆头上套置了间隔套管10，间隔套管以其外表面啮合到球头3的接纳空间8中并通过夹锥角为γ的锥形的夹紧结构锚定。球头3能够转动地插入到陶瓷的滑壳11中。
复核试验的机械的加载单元包括至少两个组件1、2（见图2），它们能够实现彼此相对移动。组件1是一闭合的锥形的套管并且组件2是一插入到组件2中的锥形的压模并在检验时沿轴向以力F（见图2）被压入到组件1中，从而锥入口7沿径向被施加了力。
轴向力F向着径向的方向的转换通过这两个组件1和2的相对移动而强化。这两个组件1、2以理想方式在其外表面上设计成锥形。锥角α应该大于球头的夹锥角γ。对于5°42'30"的夹锥角γ，压模的锥应该在7°至30°的范围内选择，以理想方式采用18°的角度。对于所有角度变量一般建议在夹锥角γ和压模的角度α之间的差从最小2°至最大25°。
锥形的套管（组件1）的材料应该有足够的可延展性，以便保证套管与球头的适配。附带地套管的材料必须具有足够的强度，以便耐受剪切负荷。作为可能的材料考虑铜合金。理想地该套管（组件1）由黄铜形成。
锥形的压模（组件2）必须明显地比套管硬。因此建议使用能被硬化的钢。理想地该压模得到表面硬化。为了保证在压模和套管之间的相对移动，锥形的压模的表面必须光滑。理想地锥形的压模的表面被抛光（Ra<0.2）。就此而言起决定作用的是，组件1和组件2之间的摩擦明显地小于组件1和球头之间的摩擦。作为组件1总表示套管且反之亦然。作为组件2总表示压模且反之亦然。
为了通过液压系统引入载荷，套管的内表面代替锥形的压模被施加液压压力。为此可以通过O环进行密封。套管1可以不仅在内部而且在外部呈锥形或柱筒形。
为了实施复核试验，球头3以其外表面3a置于具有锥形的凹槽6支座4上。锥形的凹槽6的角度用β表征。就此而言球头3有利地通过环5安置于支座4的锥形的凹槽6上。
为复核试验的目的，组件1亦即套管连同所置入的组件2亦即压模被靠置在球头3的锥入口7上。组件1的外部的锥角α大于球头3中接纳空间8的夹锥角γ，从而组件1将力仅施加到锥入口7上。
为检验的目的，将组件2沿轴向以力F压向球头。因为组件1只靠置在球头3的锥入口7上，所以只检查在该区域上的力作用的效果。
通过组件2相对组件1的相对运动，该力在锥入口7上强化。
组件1亦即套管优选在整个圆周上封闭地构造并且例如不开槽。相当令人称奇地表明，与套管不开槽的情况相比，对于开槽的套管而言即便在较小的力导入的情况下就已经会导致球头破碎。

Claims (13)

1.用于对陶瓷的用于髋关节假体的球头（3）进行检验的方法，所述球头有一带有夹锥角为γ的锥形侧面的接纳空间（8）和一锥入口（7）可供使用且为了进行检验而向所述接纳空间（8）的区域施加压力，其特征在于，仅所述锥入口（7）的区域被施授垂直于所述球头（3）的纵轴线走向的径向力。
2.根据权利要求1所述的方法，其特征在于，为了进行检验而将锥形的、锥角为α的套管（1）压入到所述接纳空间（8）中，其中所述锥角α大于所述夹锥角γ。
3.根据权利要求2所述的方法，其特征在于，所述锥角α在7°至30°的范围内选择且所述夹锥角γ和所述锥角α之间的差在最小2°和最大25°之间选择。
4.根据权利要求3所述的方法，其特征在于，所述锥角α在7°至18°的范围内选择。
5.根据权利要求2至4中任一项所述的方法，其特征在于，所述套管（1）在其周面上是封闭的且由铜合金形成。
6.根据权利要求2至4中任一项所述的方法，其特征在于，所述套管（1）在其周面上是封闭的且由黄铜形成。
7.根据权利要求2至4中任一项所述的方法，其特征在于，将锥形的带有与所述套管（1）共同的锥角α的压模（2）沿轴向以力F压入到所述套管（1）中。
8.根据权利要求7所述的方法，其特征在于，所述套管（1）和所述压模（2）之间的摩擦小于所述套管（1）和所述球头（3）之间的摩擦。
9.根据权利要求7所述的方法，其特征在于，所述压模（2）由钢形成。
10.根据权利要求9所述的方法，其特征在于，所述压模（2）由得到过表面硬化的钢形成。
11.根据权利要求2至4中任一项所述的方法，其特征在于，为了进行检验而向所述套管（1）的内表面施加液压压力。
12.用于实施根据权利要求2至11中任一项所述的方法的装置，其特征在于，该装置具有支座（4）、锥形的套管（1）和压模（2），其中全都设置在一个共同的纵轴线（12）上并且所述套管（1）和所述压模（2）能够在纵轴线（12）上推移，其中所述套管（1）布置在所述压模（2）和所述支座（4）之间并且所述锥角α大于要检验的球头（3）的夹锥角γ。
13.根据权利要求12所述的装置，其特征在于，所述套管（1）有与所述压模（2）的锥角一致的锥角α。
CN201380009825.3A 2012-02-16 2013-02-13 用于对陶瓷的用于髋关节假体的球头进行检验的方法 Active CN104203164B (zh)

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CN104203164A (zh) 2014-12-10
JP2015506795A (ja) 2015-03-05
CA2864759A1 (en) 2013-08-22
EP2814430B1 (de) 2017-12-13
US20150013469A1 (en) 2015-01-15
AU2013220395A1 (en) 2014-09-25
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US10028846B2 (en) 2018-07-24
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