CN1845713B - 活动支承件膝盖假体 - Google Patents
活动支承件膝盖假体 Download PDFInfo
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- CN1845713B CN1845713B CN2004800250158A CN200480025015A CN1845713B CN 1845713 B CN1845713 B CN 1845713B CN 2004800250158 A CN2004800250158 A CN 2004800250158A CN 200480025015 A CN200480025015 A CN 200480025015A CN 1845713 B CN1845713 B CN 1845713B
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- tibial
- tibial tray
- knee prosthesis
- mobile bearing
- tibial insert
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- 0 *C=*1CC(C2)C2CC1 Chemical compound *C=*1CC(C2)C2CC1 0.000 description 3
- XDTMQSROBMDMFD-UHFFFAOYSA-N C1CCCCC1 Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Physical Education & Sports Medicine (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)
- Prostheses (AREA)
- Materials For Medical Uses (AREA)
Abstract
一种活动件膝盖假体,它包括由胫骨盘(102)上的上凹面和胫骨嵌入物(104)上的下凸面组成的带有一定球面半径的分界面。该膝盖假体也可以包括由胫骨盘的上凸面和胫骨嵌入物的下凹面组成的带有一定球面半径的分界面。所述活动支承件膝盖假体还可以包括双凹面的分界面(如类似于“波浪”形的表面几何图形)。
Description
技术领域
在本发明的一实施方案中,一活动支承件膝盖假体(mobilebearing knee prosthesis)可以包括由胫骨盘上的上凹面和胫骨嵌入物上的下凸面组成的分界面(如带有一定球面半径的分界面)。
在本发明的另一实施方案中,一活动支承件膝盖假体可以包括由胫骨盘上的上凸面和胫骨嵌入物上的下凹面组成的分界面(如带有一定球面半径的分界面。
在本发明的另一实施方案中,一活动支承件膝盖假体可以包括双凹形分界面(如具有“波浪”形的表面几何图形)。这一“波浪”形的表面几何图形可位于第二支承件上(即位于活动支撑膝盖的胫骨嵌入物和胫骨盘之间的分界面上,其中该分界面与胫骨嵌入物和股骨部件之间的分界面相对)。此外,这一“波浪”形的表面几何图形使得可通过第二支承件提供出“事实上的”旋转轴。
在一实施例中(该实施例是例证性的而非限制性的),胫骨嵌入物可包括聚乙烯的关节连接面。在另一实施例中(该实施例是例证性的而非限制性的),胫骨盘可包括金属的关节连接面(如高度磨光的金属面)。在又一实施例中(该实施例是例证性的而非限制性的),一个或两个关节连接面可包含有金刚石(如用以改善一个或多个配合面的磨损特性)。
对本申请来说,术语“转动约束”是指在指定的位置处使一个物体基本停止转动。
此外,对本申请来说,术语“转动控制”是指对使物体转动所需的力的大小进行控制。
此外,对本申请来说,术语“上表面”与“顶面”的含义相同。
此外,对本申请来说,术语“下表面”与“底面”的含义相同。
背景技术
美国专利US6319283涉及一种活动支承件胫骨膝盖部件。特别地,该申请涉及一种用于植入到胫骨近侧的矫形膝盖部件。该矫形膝盖部件包括带有近侧胫骨平台的胫骨盘以及基本沿垂直于胫骨平台方向延伸的凸起。该胫骨盘还包括向远侧延伸的杆。一支承件与胫骨平台连接,并且具有与股骨部件接合的关节支承面。该支承件可围绕沿基本垂直于胫骨平台延伸的轴在第一旋转界限和第二旋转界限之间旋转运动。该支承件具有与胫骨平台接合的背面,其中所述胫骨平台的尺寸和形状可以使背面在第一旋转界限和第二旋转界限之间进行旋转运动的过程中在任何位置处都能够充分完全地被胫骨平台支承。
美国专利US5683468涉及一种活动支承式全关节置换。特别地,该申请涉及一种用于髁关节的假体部件。该假体部件包括带有一支承面和一对侧壁的平台。侧壁包括一对彼此面对着的凹面,并且形成了相同直圆柱体上的弧。该假体部件还包括带有支承面的塑性支承件,其中该支承面能够与平台的支承面滑动地接合。支承件包括可限定出两直圆柱体的弧的推力面,其中所述直圆柱体的半径小于平台侧壁表面的半径。所述推力面彼此具有一定间隔,从而仅允许支承件在中间至外侧方向上有限的滑动,但其在从前至后的方向上具有较大的滑动。
美国专利US5556432涉及一种人工关节。特别是,该专利涉及一种用于人类膝关节的内置假体,它由至少两个可彼此相对运动的关节部件组成,带有环形关节面的关节头和关节底部,它们在相互垂直的平面上-纵向面和横向面-具有带着不同的圆形相交轮廓的功能面,从而该功能面的曲率在每个平面上被限定为凸-凸曲面、凸-凹曲面或凹-凹曲面,并且在两个平面的每一平面中相互之间的功能区域的几何形状由带有两个链轴的链条(由两部分组成的环链)限定,这些链轴穿过了功能区域的旋转中心,其中所述旋转中心分别具有附属相交轮廓的半径。
美国专利US5358530涉及一种活动支承式膝盖。特别地,该专利涉及一种活动支承件膝盖假体,它包括带有骨节部分的股骨植入件,其中该骨节部分被缚在股骨上,还包括带有平台的胫骨盘植入件,其中该平台被缚在胫骨上。胫骨盘植入件具有一对彼此间隔、凹入的弯曲平台支承面,该支承面用于与胫骨支承件上凸出的曲面配合,并与其滑动。胫骨盘平台支承面被成形为产生能够逐渐增加对胫骨支承件的滑动和旋转运动产生的阻力。装配在股骨和胫骨盘植入体之间的胫骨支承件可由一个或两个部件构造而成。
美国专利US4224696涉及一种膝盖假体。特别地,该专利涉及的膝盖假体带有股骨植入件、胫骨植入件以及安置在上述植入件之间的半月板。通过股骨植入件的组合弯曲骨节表面可使膝盖弯曲和牵伸,其中所述的这些表面类似于真正膝盖的相应的表面,并且还与半月板中凸起的支承面的相应形状类似。膝盖假体在半月板与胫骨植入件之间的分界面上还可产生其他的运动。该分界面是由连续的凹入的球形表面以及相对应的、连续的凸起的半月板球形表面限定而成,其中所述凹入的球形表面向上面向着胫骨植入件的平台。这些部件在围绕在膝盖假体周围的人体自身韧带的作用下,沿着相互配合的凹面和凸面被偏压成相互接合。膝盖假体的相互配合的凸面和凹面所形成的这种连续偏压接合能够使稳定性得到保证。
发明内容
本发明提供一种活动支承件膝盖假体,其包括:用于连接患者胫骨的胫骨盘;以及设置在胫骨盘邻近的胫骨嵌入物;与胫骨嵌入物底面相关联的第一配合件和与胫骨盘顶面相关联的第二配合件;其中,胫骨嵌入物能够相对于胫骨盘运动,并且胫骨嵌入物相对于胫骨盘的运动至少包括枢转运动;该枢转运动是围绕一旋转轴进行的,所述旋转轴由在胫骨盘顶面上的一基本呈圆形的凸起位置限定;所述基本呈圆形的凸起位置沿着胫骨盘的中间-侧向轴线和前-后侧轴线朝着远离第二配合件的方向向下弯曲;当向胫骨盘的中间边缘靠近时,中间边缘的至少一部分向上弯曲,当向胫骨盘的侧向边缘靠近时,侧向边缘的至少一部分向上弯曲;以及当胫骨嵌入物和胫骨盘在中间-侧向轴线和前-后侧轴线的方向上都对准时,胫骨嵌入物的底面被设置成与胫骨盘的顶面基本互补;所述第二配合件被设置在所述胫骨盘顶面上的所述基本呈圆形的凸起位置上;所述第一配合件包括从胫骨嵌入物底面延伸的柱件,并且所述第二配合件包括设置在胫骨盘顶面上的孔。
其中,胫骨嵌入物的上表面被构造成容纳连接患者股骨的股骨部件。
所述活动支承件膝盖假体还包括一机构,该机构对胫骨嵌入物相对于胫骨盘的运动提供旋转控制和旋转约束的至少其中之一。
其中,所述对胫骨嵌入物相对于胫骨盘的运动提供旋转控制和旋转约束的至少其中之一的机构包括设置在所述孔内的十字销和设置在所述柱件上的凹槽,其中,该十字销被容纳在凹槽内。
其中,所述对胫骨嵌入物相对于胫骨盘的运动提供旋转控制和旋转约束的至少其中之一的机构包括至少一个沿着胫骨盘的中间边缘设置的第一突出部,以及至少一个沿着胫骨盘侧向边缘设置的第二突出部,其中,在沿第一方向转动的过程中,第一突出部与胫骨嵌入物接触以提供旋转控制和旋转约束的至少其中之一,在沿第二方向转动的过程中,第二突出部与胫骨嵌入物接触以提供旋转控制和旋转约束的至少其中之一。其中,第一突出部包括用以容纳胫骨嵌入物第一边缘的第一底切,第二突出部包括用以容纳胫骨嵌入物第二边缘的第二底切。
所述活动支承件膝盖假体还包括基本防止胫骨嵌入物从胫骨盘上翘起的机构。
其中,基本防止胫骨嵌入物从胫骨盘上翘起的机构包括柱件上的凸起部分,该凸起部分与胫骨盘上限定孔的部分中的凹部相配合。
其中,基本防止胫骨嵌入物从胫骨盘上翘起的机构包括至少一个沿着胫骨盘的中间边缘设置的第一突出部,以及至少一个沿着胫骨盘侧向边缘设置的第二突出部,其中,第一突出部包括用以容纳胫骨嵌入物第一边缘的第一底切,第二突出部包括用以容纳胫骨嵌入物第二边缘的第二底切。
其中所述孔和柱件中的至少其中之一基本呈圆形。
其中,所述孔和凸起位置沿着胫骨盘中间-侧向轴的大体中央位置设置。
其中,所述孔和凸起位置沿着胫骨盘前-后侧轴的大体中央位置设置。
其中,胫骨盘的上表面由金属构成,胫骨嵌入物的下表面由聚乙烯构成。胫骨盘由金属构成,胫骨嵌入物由聚乙烯构成。
附图说明
图1A示出了按照本发明一实施方案的活动支承件膝盖假体的透视图;
图1B示出了图1A中活动支承件膝盖假体的俯视图;
图1C示出了图1A中活动支承件膝盖假体的侧视图;
图1D示出了图1A中活动支承件膝盖假体的另一俯视图;
图1E示出了沿图1D中A-A线剖开的截面图;
图2A示出了按照本发明另一实施方案的活动支承件膝盖假体的俯视图;
图2B示出了沿图2A中H-H线剖开的截面图;
图2C示出了图2A中活动支承件膝盖假体的透视图;
图3示出了按照本发明又一实施方案的活动支承件膝盖假体的透视图;
图4A示出了按照本发明又一实施方案的活动支承件膝盖假体中胫骨盘部件的平面图;
图4B示出了图4A中胫骨盘部件的侧视图;
图4C示出了按照本发明又一实施方案的活动支承件膝盖假体中胫骨嵌入物部件的平面图;
图4D示出了图4C中胫骨嵌入物部件的侧视图;
图5A示出了按照本发明又一实施方案的活动支承件膝盖假体中胫骨盘部件的平面图;
图5B示出了图5A中胫骨盘部件的侧视图;
图6A示出了按照本发明又一实施方案的活动支承件膝盖假体中胫骨盘部件的平面图;
图6B示出了图6A中胫骨盘部件的侧视图;
图7A示出了按照本发明又一实施方案的活动支承件膝盖假体的平面图;
图7B示出了图7A中活动支承件膝盖假体的截面图;
图7C示出了图7A中活动支承件膝盖假体的胫骨盘的侧视图;
图8A示出了按照本发明又一实施方案的活动支承件膝盖假体的透视图;
图8B示出了图8A中活动支承件膝盖假体的透视图(从局部切开);
图8C示出了图8A中活动支承件膝盖假体的透视图(从局部切开);
图9A示出了按照本发明又一实施方案的活动支承件膝盖假体的俯视图(其中示出了胫骨嵌入物可被旋转和锁定在胫骨盘上的适当位置处);
图9B示出了图9A中活动支承件膝盖假体的截面图;
图9C示出了与图9A中活动支承件膝盖假体相关的某些细节;
图9D也示出了与图9A中活动支承件膝盖假体相关的某些细节;
图10A示出了按照本发明又一实施方案的胫骨盘的平面图;
图10B示出了图10A中胫骨盘的截面图;
图10C示出了使用图10A中所示胫骨盘的胫骨嵌入物的平面图;
图10D示出了图10A-10C中胫骨盘和胫骨嵌入物的平面图;
图10E示出了沿图10D中B-B线剖开的某些细节;
图10F示出了沿图10D中B-B线剖开的某些细节;
图11示出了按照本发明又一实施方案的活动支承件膝盖假体的侧视图;
图12A示出了按照本发明又一实施方案的活动支承件膝盖假体的平面图;
图12B示出了图12A中活动支承件膝盖假体的侧视图;
图13A示出了按照本发明又一实施方案的活动支承件膝盖假体的正视图(在该视图中,胫骨嵌入物和胫骨盘接合在一起,并且在相匹配的部件之间可看到一致的曲率);
图13B示出了按照图13A所示实施方案的活动支承件膝盖假体的正视图(在该视图中,胫骨嵌入物和胫骨盘局部接合,并且在相匹配的部件之间可看到一致的曲率);
图13C示出了按照图13A所示实施方案的活动支承件膝盖假体的侧视图(在该视图中,胫骨嵌入物和胫骨盘接合在一起,并且在相匹配的部件之间可看到一致的曲率);
图13D示出了按照图13A所示实施方案的活动支承件膝盖假体的侧视图(在该视图中,胫骨嵌入物和胫骨盘局部接合,并且在相匹配的部件之间可看到一致的曲率);
图13E示出了按照图13A所示实施方案的活动支承件膝盖假体的另一正视图(在该视图中,胫骨嵌入物和胫骨盘接合在一起,胫骨嵌入物相对于胫骨盘旋转了10°,并且在相匹配的部件之间可看到一致的曲率);
图13F示出了按照图13A所示实施方案的活动支承件膝盖假体的透视图(其中胫骨嵌入物和胫骨盘接合在一起,并且在相匹配的部件之间可看到一致的曲率);
图14A示出了按照图13A所示实施方案的活动支承件膝盖假体的又一正视图(其中该附图包括了贯穿活动支承件膝盖假体中心的截面线指示部);
图14B示出了沿图14A中截面线指示部的截面图(其中可以看到胫骨嵌入物上“波浪形”几何图形与轴向杆的关系);
图14C示出了按照图13A所示实施方案的活动支承件膝盖的又一正视图(其中该附图包括了贯穿活动支承件膝盖中心的截面线指示部,并且胫骨嵌入物相对于胫骨盘旋转了10°);
图14D示出了沿图14C中截面线指示部的截面图(其中可以看到胫骨嵌入物上“波浪形”几何图形与轴向杆的关系,并且胫骨嵌入物相对于胫骨盘旋转了10°);
图15A-15C示出了按照本发明一实施方案的活动支承件膝盖假体中胫骨嵌入物下表面的透视图(不同的角度);
图16A和16B示出了按照本发明一实施方案的活动支承件膝盖假体中胫骨盘上表面的透视图(不同的角度);
图17A-17C示意性地示出了按照本发明一实施方案的活动支承件膝盖的截面图;
图18A和18B示意性地示出了按照本发明一实施方案的活动支承件膝盖的截面图;
图19A和19B示意性地示出了按照本发明实施方案的中心枢转特征(图19A)和偏心(或偏置)枢转特征(图19B);以及
图20A-20E示意性地示出了按照本发明实施方案的偏置枢转机构的平面图。
在这些已经公开的益处和改进中,本发明其他的目的和优点将在下面结合附图的描述中变得更加清楚。这些附图构成了说明书的一部分,包含本发明中的示意性实施方案,并且由此示出了各种目的和特征。
具体实施方式
这里将对本发明的具体实施方案进行说明;但是,应当理解的是这里描述的实施方案仅仅是例证性的,可表现出各种形式。此外,本发明所给定的各个实施例都是示例性的,而非限制性的。而且,附图无需按比例绘制,一些特征可以被放大以便于示出特定的部件的细节。因此,这里公开的特定结构和功能上的细节不是作为限定而说明,而仅仅是作为具有代表性的基准,以用于教导本领域的技术人员对本发明进行多方面的应用。
在一实施方案中,一活动支承件膝盖假体可以包括由胫骨盘上的上凹面和胫骨嵌入物上的下凸面组成的分界面(如带有一定球面半径的分界面)。在另一实施方案中,一活动支承件膝盖假体可以包括由胫骨盘上的上凸面和胫骨嵌入物上的下凹面组成的分界面(如带有一定球面半径的分界面)。值得注意的是,这种球面半径具有自动调整的固有倾向。
在一实施方案中(该实施方案是例证性的而非限制性的),胫骨嵌入物包括一聚乙烯的关节连接面。在另一实施方案中(该实施方案也是例证性的而非限制性的),胫骨盘包括一金属的关节连接面(如高度磨光的金属关节接合面)。在又一实施方案中(该实施方案也是例证性的而非限制性的),其中的一个或两个关节面可包括金刚石(如可用来改善一个或多个配合面的磨损特性)。
在活动支承件膝盖假体的另一个实施方案中,分界面具有枢转位置。在一实施方案中(该实施方案是例证性的而非限制性的),所述枢转位置是通过凹形元件(如圆柱件、锥形件或它们的组合)限定而成,凹形元件与凸形元件(如柱件)相配合。这一枢转位置可位于分界面的中心或沿着中间、侧向、前向和/或后向中的一个或多个方向偏离分界面的中心。
在活动支承件膝盖假体的另一实施方案中,可设置一锁定件,这有助于防止胫骨嵌入物翘起(lift-off)。在一实施方案中(该实施方案是例证性的而非限制性的),可通过凸形元件(如柱件)与凹形元件(如圆柱件、锥形件或它们的组合)的配合作用形成锁定件,从而有助于防止关节接合面的翘起。
在活动支承件膝盖假体的另一实施方案中,可通过利用被扩大从而允许在一个或多个所期望的平面产生额外运动的凹形部件(例如圆柱件、锥形件或它们的组合)来形成前向/后向平移和/或中间/侧向平移。
在活动支承件膝盖假体的另一实施方案中,可通过中间和/或横向杆来提供旋转约束和/或控制,其中该中间和/或横向杆在胫骨嵌入物旋转了特定的角位移时,会干涉和/或楔入到胫骨嵌入物(可在一个或两个杆上产生干涉和/楔入)。此外,为了有助于容纳胫骨嵌入物,可以在一个或两个杆上设置凹槽,并且在胫骨嵌入物上设置与凹槽相匹配的部件。
在活动支承件膝盖假体的又一实施方案中,可通过把凸形部件(如柱件)用作弹簧(如扭簧)来提供旋转约束和/或控制,以便能够将约束件(如十字销)***到凸形部件的接收件(如V形槽)中。
在活动支承件膝盖假体的又一实施方案中,可利用旋转分界面上的椭圆面来提供旋转约束和/或控制。
现在参考图1A-1E,活动支承件膝盖假体100包括胫骨盘102,胫骨嵌入物104以及与胫骨嵌入物104相连的股骨组件(未示出)。
在一实施例中(该实施例是例证性的而非限制性的),活动支承件膝盖假体100包括由胫骨盘102上的上凹面和胫骨嵌入物104上的下凸面组成的分界面(如带有一定球面半径的分界面)(需要注意的是,这种球面半径可具有自动调整的固有趋势)。
在另一实施例中(该实施例是例证性的而非限制性的),胫骨嵌入物104包括聚乙烯的关节连接面。在又一实施例中(该实施例是例证性的而非限制性的),胫骨嵌入物102包括金属的关节连接面(如高度磨光的金属关节连接面)。
活动支承件膝盖假体可具有枢转位置。在一实施例中(该实施例是例证性的而非限制性的),枢转位置可由与柱件108配合的空腔106形成。柱件108可以使活动支承件膝盖假体100变得稳固以抵抗剪切力(如在横向平面上中间/侧向上的作用力),并且还可用作旋转轴。
活动支承件膝盖假体100还可包括锁定件,以便能够有助于防止胫骨嵌入物104的翘起。在一实施例中(该实施例是例证性的而非限制性的),该锁定件可由和凸起部分112(被设置在柱件108上)共同作用的凹部110(被设置在空腔106内)形成(例如见图1E)。此外,活动支承件膝盖假体100可以产生前向/后向平移以及/或者中间/侧向平移(如通过利用被增大从而允许在一个或多个所期望的平面内产生额外运动的空腔106来实现)。在一实施例中(该实施例是例证性的而非限制性的),A/P(前/后)平移大约为4.5mm。
现在参考图2A-2C,可以看到枢转位置被设置在所期望的地方。例如(该实施例是例证性的而非限制性的)枢转位置可被设置在活动支承件膝盖假体200(它包括胫骨盘202和胫骨嵌入物204)的中心(由虚线所示的圆“A”表示)、前部(由虚线所示的圆“B”表示)或后部(由虚线所示的圆“C”表示)。应当注意的是,图2A-2C所示的活动支承件膝盖假体类似于图1A-1E中所示的,只是不带有凹部/凸起部分这种防翘起机构。还需注意的是,通常认为向后移动枢转位置将会趋向于使柱件208的力矩最小化。在一实施例中(该实施例是例证性的而非限制性的),旋转极限可以在50-53度的范围内。
现在参考图3,活动支承件膝盖假体300包括胫骨盘302,胫骨嵌入物304以及与胫骨嵌入物304相连的股骨组件(未示出)。活动支承件膝盖假体300还可以包括一个或多个金刚石支承面310,这些支承面位于胫骨盘302的关节连接面上、胫骨嵌入物304的关节连接面上、空腔306内以及/或者柱件308上。从这点上讲,利用高耐磨的金刚石支承面310,胫骨嵌入物304的关节连接面(如聚乙烯表面)与胫骨盘302的关节连接面形成的隔离,这有助于避免传统的活动支承件膝盖假体所固有的后部磨损问题。
现在参考图4A-4D,活动支承件膝盖假体包括胫骨盘402,胫骨嵌入物404,以及与胫骨嵌入物404相连的股骨部件(未示出)。活动支承件膝盖假体还可以包括金刚石支承面410,这些支承面位于胫骨盘402的关节连接面上、胫骨嵌入物404的关节连接面上、空腔406内以及/或者柱件408上。在一实施例中(该实施例是例证性的而非限制性的),与金刚石支承面410的三点接触形成了一个平面。在另一实施例中(该实施例是例证性的而非限制性的),一个或多个金刚石支承面410(如胫骨嵌入物404上的金刚石支承面410)呈球形或半球形(如用以避免或减少边缘载荷)。在又一实施例中(该实施例是例证性的而非限制性的),一个或多个金刚石支承面410可以是压配合。
在另一实施例中,可设置一旋转停止机构,这有助于确保金刚石支承面(如后部、中间和侧向上的金刚石支承面)总是保持接合状态。在另一实施例中(该实施例是例证性的而非限制性的),旋转停止机构可以是金刚石倚靠着金刚石的模式。从这一点讲,例如参考图5A和5B,胫骨盘502上最前部的金刚石支承件被提升(使得胫骨嵌入物(未示出)底面上中部和旁边的金刚石支承面邻接,并约束了旋转运动)。
现在参考图6A和6B,用于活动支承件膝盖假体的胫骨盘602具有大直径的表面,如球面(胫骨嵌入物(未示出)在其后部也具有相匹配的大直径表面,如球面)。胫骨盘602还可以具有平面602a(该平面602a基本是平坦的)。在一实施例中(该实施例是例证性的而非限制性的),平面602a可以是一聚乙烯部件(如模制的“圆盘”)。在另一实施例中(该实施例是例证性的而非限制性的),图6A中由“A”标识的面积可以维持着一个较大的接触面积。
现在参考图7A-7C,活动支承件膝盖假体700包括胫骨盘702,胫骨嵌入物704以及与胫骨嵌入物704相连的股骨部件(未示出)。在一实施例中(该实施例是例证性的而非限制性的),胫骨盘702具有一凹入的关节连接面,而胫骨嵌入物704具有一凸起的关节连接面。上述关节连接面可具有较大的半径球面(如旋转/活动假体的后部关节)。
在另一实施例中(该实施例是例证性的而非限制性的),在图7B所示的区域“A”中形成了比区域“B”中更为紧密的间隙。
现在参考图8A-8C,图中示出了一有助于旋转约束和/或控制的实施方案。
特别地,活动支承件膝盖假体800包括胫骨盘802,胫骨嵌入物804,以及与胫骨嵌入物704相连的股骨部件(未示出)。活动支承件膝盖假体800还可以具有由与柱件808配合的空腔806形成的枢转位置。此外,十字销806A可以与凹槽808a配合,从而在胫骨嵌入物804旋转的过程中,十字销806a可用作转动停止件,并且柱件808可用作弹簧(即对旋转产生阻力的扭簧)。
在一实施例中(该实施例是例证性的而非限制性的),可以改变十字销806a的直径和/或凹槽808a的尺寸,以形成不同程度的旋转约束和/或控制。
在另一实施例中(该实施例是例证性的而非限制性的),可以在植入胫骨盘802之前安装十字销806a(借此,凹槽808a能够将胫骨嵌入物804与胫骨盘802一起安装在体内适当的位置上,如胶合在适当的位置上)。
现在参考图9A-9D以及10A-10E,图中示出了有助于旋转约束和/或控制以及/或者有助于防止胫骨嵌入物翘起的各种其它实施例。
特别地,如图9A-9C所示,当胫骨嵌入物904旋转时,它可以接触到胫骨盘902的旋转限制突出部902a(rotation limiting tabs)(借此可以将胫骨嵌入物904楔入到适当的位置,而且能够进一步抑制旋转)。
此外,每个旋转限制突出部902a都包括底切902b,当达到旋转的极限值时,所述底切有助于防止翘起(从这一点讲,胫骨嵌入物904可以包括一个或多个唇部904a,用以接合旋转限制突出部902a和/或底切902b)。
此外,胫骨嵌入物904还可以包括位于胫骨盘902中空腔910内的柱件908,从而空腔910就具有凹部912以用来容纳柱件908的凸起部分914。凹部912和凸起部分914相互配合,这样有助于防止胫骨嵌入物904的翘起。在一实施例中(该实施例是例证性的而非限制性的),柱件908和空腔910之间的运转间隙大约为0.005至0.010英寸。
图10A和10B示出了在胫骨盘1002外壁部分内侧的一段距离“A”;图10C示出了与胫骨嵌入物1004相关联的距离B1,B2和C(其中距离B1和B2大于距离A,距离C小于距离A);图10D示出了当胫骨嵌入物1004旋转(在这一实施例中是顺时针方向旋转)时,胫骨盘1002和胫骨嵌入物1004之间的接触点。
此外,图10E示出了在图10D所示的一接触点处胫骨盘1002和胫骨嵌入物1004之间干涉的细节,图10F示出了在胫骨嵌入物1004没有旋转过某一点(例如,在“中性位置”)时,在图10E所示的接触点处没有形成干涉。需要注意的是,图10E和10F中也示出了凹槽1002a,这一凹槽例如可用于使聚乙烯流动以及/或者有助于防止翘起。
现在参考图11,可以看到按照本发明实施方案的活动支承件膝盖假体1100包括胫骨盘1102和胫骨嵌入物1104,其中活动支承件膝盖1100的旋转轴线A可被设置成与膝盖本身的轴线成一直线。
现在参考图12A和12B,可以看到按照本发明实施方案的活动支承件膝盖1200包括胫骨盘1202和胫骨嵌入物1204。需要注意的是,图12A和12B中的这些设计能够通过用于后十字韧带(PCL)的间隙保持住后十字韧带(这里不需要利用PS脊柱(例如,一些其他的实施方案中可能需要)提供的后部稳定性)。
在另一实施方案中,胫骨嵌入物可由超高分子量的聚乙烯(“UHMWPE”)制成。在一实施例中(该实施例是例证性的而非限制性的),UHMWPE可以是模制成的UHMWPE(据认为,这种模制成的UHMWPE具有比机加工成的UHMWPE低的磨损率)。
现在参考图13A-13F,14A-14D,15A-15C,16A,16B以及17A-17C,需要注意的是在本发明的这些实施方案中,活动支承件膝盖假体可包括双凹面的分界面。
从这一点讲,需要注意的是这种双凹面分界面有助于提供一种最佳的膝盖解剖学构造,同时还可提供出足够厚(如根据耐磨性)的胫骨嵌入物关节连接结构(如聚乙烯关节连接结构)。在一实施例中(该实施例是示例性的而非限制性的),这种关节连接结构大约为6.5mm厚。
接下来参考图17A,可以看到胫骨嵌入物关节连接结构具有均匀的或恒定的厚度(即图17A中的厚度“X”),参考图17B,可以看到胫骨嵌入物关节连接结构还具有不均匀的或非恒定的厚度(如图17B中“A”区域和“B”区域处的厚度“Y”)。
此外,这种双凹面分界面有助于克服患者运动过程中由于翘起而引起的潜在剪切应力(参见图17C,示出了本发明所涉及的防止翘起以进行自动定心,以及减少或消除对枢转部件(如轴向的柱件)的剪切应力)。
还需要注意的是,图13A-13F,14A-14D,15A-15C,16A,16B以及17A-17C所示的这些实施方案可以包括上述各种枢转、平移、锁定、旋转约束和/或控制部件中的部分或全部。
现在参考图18A和18B,按照本发明实施方案的活动支承件膝盖假体包括由胫骨盘上的上凸面和胫骨嵌入物上的下凹面组成的分界面(如具有一定球面半径的分界面)(需要注意的是,这种球面半径具有自动调整的内在倾向)。
值得注意的是,上述结构通过从分界面中产生出磨料(如由分界面处的相对运动产生的聚乙烯颗粒),能够有助于减少胫骨嵌入物和胫骨盘之间的分界面的磨损(参见图18A)。
当然还需注意的是,正如图18B中所看到的,根据需要(如为了获得最优的耐磨性能并便于运动)可以改变形成胫骨嵌入物的材料厚度。在一实施例中(该实施例是例证性的而非限制性的),标记“A”和“B”的区域要比标记“C”的区域厚。
还需注意的是,图18A和18B所示的实施方案包括上述的各种枢转、平移、锁定、旋转约束和/或控制部件中的部分或全部。
现在参考图19A和19B,再次注意的是按照本发明的活动支承件膝盖假体可以与偏心(或偏置)枢转部件(如轴向的柱件)结合。特别地,在一实施方案中,这种偏心枢转部件可用于(如在患者运动的过程中)减少与内髁(medial condolyte)相关联的向前移动,并且增加与外髁(lateral condolyte)相关联的返回(向后移动)。从这一点讲,如图19A和19B所看到的,图19A示出了与中间枢轴(如相对于胫骨使股骨向外旋转70°)相关联的大幅度向前移动,图19B示出了与中间的偏心枢轴(如相对于胫骨使股骨向外旋转70°)相关联的小幅度向前移动。特别地,图19A和19B示出了偏心枢轴引起的与内髁相关联的小幅度向前移动和与外髁相关联的大幅度向后移动。
此外,需要注意的是,图19A和19B所示的实施方案包括上述的各种枢转、平移、锁定、旋转约束和/或控制部件中的部分或全部。
最后,参考图20A-20E,应该注意,本发明的该特定实施方案涉及与其他部件相结合的偏心枢轴部件的使用(如使用偏心的轴向柱件),其中这些部件也可以被构造成与非偏置枢轴部件一起使用。
例如(该实施例是例证性的而非限制性的),可采用一不对称的部件(如偏心轴向柱件)与对称的胫骨盘和对称的支承件(如聚乙烯支承件)相联以“凸轮”原理运行。图20A示出了按照这一实施方案的聚乙烯支撑件(在不旋转的条件下)的平面图,图20B示出了按照这一实施方案的胫骨盘(在不旋转的条件下)的平面图。此外,图20C示出了与向外旋转(右膝)相关联的偏心的旋转中心(点A),图20D示出了与向外旋转(左膝)相关联的偏心的旋转中心(点B)。
此外,图20E示出了采用“梁”形的平面图。
而且,需要说明的是图20A-20E所示的这些实施方案可以包括一个或多个内部停止机构(如用于旋转约束和/或控制的机构)。此外,图20A-20E所示的这些实施方案可用在与胫骨嵌入物和/或胫骨盘相关的方面,其中该胫骨盘具有包括平面部分、凹入部分和/或凸起部分的分界面。
此外,还需要注意的是图20A-20E所示的这些实施方案当然也可以包括上述的各种枢转、平移、锁定、旋转约束和/或控制部件中的部分或全部。
应注意的是,对于同样尺寸的膝盖假体来说(如3号尺寸),用于“波形”设计中的胫骨嵌入物和胫骨盘之间的接触面积比用于平面设计中的大(如高出10%的接触面积)。在一定的情形下,期望能够使这一接触面积最小化。因此,在一实施方案中,通过减少第二支承件(即在活动支承件膝盖中,胫骨嵌入物与胫骨盘之间的分界面,该分界面与胫骨嵌入物和股骨部件之间的分界面相对)的同余因子(congruencefactor)来使胫骨嵌入物和胫骨盘之间的接触面积最小化。还应当注意到是,这一解决方案不能用于平面设计,因为平面设计中的同余因子总是等于一。还要注意的是当接触仅仅发生在负载区域上时,这种同余因子方法具有优势。
在另一实施方案中,可以减小由柱件和孔之间的接触所引起的磨损,这是因为剪切应力能够被胫骨盘吸收(如受到“波形”内侧部的缓冲)。
尽管已经对本发明的多个实施方案进行了说明,应当理解的是这些实施方案仅仅是实例性的,而非限制性的,因此许多改进对本领域的普通技术人员来说变得更加直观。例如,可以采用一个或多个适当的紧固件来装配本发明的活动支承件膝盖假体(如采用螺钉或螺栓使胫骨嵌入物相对于胫骨盘保持正确的定位)。此外,本发明的活动支承件膝盖假体可带有能够预测位置、自动调整以及/或者能够自动定心的支承件。而且,可采用任意所期望的技术(如带有抛光剂的钻机)对金属进行抛光。而且,胫骨嵌入物可以比胫骨盘小(至少在某一尺寸上),从而可防止旋转过程中出现悬垂现象(例如,通过减小胫骨嵌入物中间/侧向的尺寸来实现)。可采用聚乙烯、金属、金刚石、陶瓷、聚醚醚酮(“PEEK”)以及/或者任何其他所需要的低摩擦关节用材料形成一个或多个彼此相配合的关节连接面。例如,胫骨盘、胫骨嵌入物和/或股骨部件可采用模制金属的构造(如UHMWP的模制金属)。胫骨盘、胫骨嵌入物和/或股骨部件可包括钴、铬和/或钛。可采用任何所需要的机械装置(如接合剂、一个或多个底切以及与其相匹配的凸起、机械紧固件(如螺钉)等)将股骨部件连接(如缚)到患者的股骨上。还可采用任何所期望的机械装置(如接合剂、一个或多个底切以及与其相匹配的凸起、机械紧固件(如螺钉)等)将胫骨盘连接(如缚)到患者的胫骨上。另外,按照本发明的活动支承件膝盖假体中的一个或多个部件可用来“更新”现有的假体/部件。此外,术语“活动支承件膝盖假体”还包括(但不限于)“旋转平台”式机构和“mensicalbearing”式机构。
Claims (14)
1.一种活动支承件膝盖假体,其包括:
用于连接患者胫骨的胫骨盘;以及
设置在胫骨盘邻近的胫骨嵌入物;
与胫骨嵌入物底面相关联的第一配合件和与胫骨盘顶面相关联的第二配合件;
其中,胫骨嵌入物能够相对于胫骨盘运动,并且胫骨嵌入物相对于胫骨盘的运动至少包括枢转运动;
该枢转运动是围绕一旋转轴进行的,所述旋转轴由在胫骨盘顶面上的一呈圆形的凸起位置限定;
所述呈圆形的凸起位置沿着胫骨盘的中间-侧向轴线和前-后侧轴线朝着远离第二配合件的方向向下弯曲;
当向胫骨盘的中间边缘靠近时,中间边缘的至少一部分向上弯曲,当向胫骨盘的侧向边缘靠近时,侧向边缘的至少一部分向上弯曲;以及
当胫骨嵌入物和胫骨盘在中间-侧向轴线和前-后侧轴线的方向上都对准时,胫骨嵌入物的底面被设置成与胫骨盘的顶面互补;
所述第二配合件被设置在所述胫骨盘顶面上的所述呈圆形的凸起位置上;
所述第一配合件包括从胫骨嵌入物底面延伸的柱件,并且所述第二配合件包括设置在胫骨盘顶面上的孔。
2.如权利要求1所述的活动支承件膝盖假体,其中,胫骨嵌入物的上表面被构造成容纳连接患者股骨的股骨部件。
3.如权利要求1所述的活动支承件膝盖假体,还包括一机构,该机构对胫骨嵌入物相对于胫骨盘的运动提供旋转控制和旋转约束的至少其中之一。
4.如权利要求3所述的活动支承件膝盖假体,其中,所述对胫骨嵌入物相对于胫骨盘的运动提供旋转控制和旋转约束的至少其中之一的机构包括设置在所述孔内的十字销和设置在所述柱件上的凹槽,其中,该十字销被容纳在凹槽内。
5.如权利要求3所述的活动支承件膝盖假体,其中,所述对胫骨嵌入物相对于胫骨盘的运动提供旋转控制和旋转约束的至少其中之一的机构包括至少一个沿着胫骨盘的中间边缘设置的第一突出部,以及至少一个沿着胫骨盘侧向边缘设置的第二突出部,其中,在沿第一方向转动的过程中,第一突出部与胫骨嵌入物接触以提供旋转控制和旋转约束的至少其中之一,在沿第二方向转动的过程中,第二突出部与胫骨嵌入物接触以提供旋转控制和旋转约束的至少其中之一。
6.如权利要求5所述的活动支承件膝盖假体,其中,第一突出部包括用以容纳胫骨嵌入物第一边缘的第一底切,第二突出部包括用以容纳胫骨嵌入物第二边缘的第二底切。
7.如权利要求1所述的活动支承件膝盖假体,还包括防止胫骨嵌入物从胫骨盘上翘起的机构。
8.如权利要求7所述的活动支承件膝盖假体,其中,防止胫骨嵌入物从胫骨盘上翘起的机构包括柱件上的凸起部分,该凸起部分与胫骨盘上限定孔的部分中的凹部相配合。
9.如权利要求7所述的活动支承件膝盖假体,其中,防止胫骨嵌入物从胫骨盘上翘起的机构包括至少一个沿着胫骨盘的中间边缘设置的第一突出部,以及至少一个沿着胫骨盘侧向边缘设置的第二突出部,其中,第一突出部包括用以容纳胫骨嵌入物第一边缘的第一底切,第二突出部包括用以容纳胫骨嵌入物第二边缘的第二底切。
10.如权利要求1所述的活动支承件膝盖假体,其中所述孔和柱件中的至少其中之一呈圆形。
11.如权利要求1所述的活动支承件膝盖假体,其中,所述孔和凸起位置沿着胫骨盘中间-侧向轴的中央位置设置。
12.如权利要求1所述的活动支承件膝盖假体,其中,所述孔和凸起位置沿着胫骨盘前-后侧轴的中央位置设置。
13.如权利要求1所述的活动支承件膝盖假体,其中,胫骨盘的上表面由金属构成,胫骨嵌入物的下表面由聚乙烯构成。
14.如权利要求13所述的活动支承件膝盖假体,其中,胫骨盘由金属构成,胫骨嵌入物由聚乙烯构成。
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- 2004-07-19 ES ES04757128T patent/ES2343007T3/es active Active
- 2004-07-19 CA CA2532877A patent/CA2532877C/en not_active Expired - Fee Related
- 2004-07-19 US US10/894,146 patent/US7422605B2/en active Active
- 2004-07-19 AT AT04757128T patent/ATE461679T1/de not_active IP Right Cessation
- 2004-07-19 DE DE602004026190T patent/DE602004026190D1/de active Active
- 2004-07-19 AU AU2004258934A patent/AU2004258934B2/en not_active Ceased
- 2004-07-19 CN CN2004800250158A patent/CN1845713B/zh not_active Expired - Fee Related
- 2004-07-19 WO PCT/US2004/023189 patent/WO2005009298A1/en active Application Filing
- 2004-07-19 EP EP04757128A patent/EP1646335B1/en not_active Not-in-force
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2008
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Also Published As
Publication number | Publication date |
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ES2343007T3 (es) | 2010-07-21 |
CA2532877A1 (en) | 2005-02-03 |
EP1646335A4 (en) | 2008-01-09 |
US20050027365A1 (en) | 2005-02-03 |
JP2007531550A (ja) | 2007-11-08 |
CN1845713A (zh) | 2006-10-11 |
WO2005009298A1 (en) | 2005-02-03 |
US20080300690A1 (en) | 2008-12-04 |
EP1646335A1 (en) | 2006-04-19 |
DE602004026190D1 (de) | 2010-05-06 |
US7422605B2 (en) | 2008-09-09 |
ATE461679T1 (de) | 2010-04-15 |
JP4451881B2 (ja) | 2010-04-14 |
CA2532877C (en) | 2012-10-09 |
AU2004258934B2 (en) | 2010-06-03 |
AU2004258934A1 (en) | 2005-02-03 |
EP1646335B1 (en) | 2010-03-24 |
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