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1. 发明授权

US5935171A Apparatus for, and method of, detecting dislocations and material wear in hip replacements 失效
标题翻译：检测髋关节置换术中脱位和磨损的装置及方法
公开(公告)号：US5935171A
公开(公告)日：1999-08-10
申请号：US971706
申请日：1997-11-17
申请人： John E. Schneider , Richard H. Walker , Elwood G. Norris
发明人： John E. Schneider , Richard H. Walker , Elwood G. Norris
IPC分类号： A61B5/06 , A61B5/11 , A61F2/00 , A61F2/32 , A61F2/34 , A61F2/36 , A61F2/46 , A61F2/48 , A61F2/30 , A61F2/76
CPC分类号： A61B5/4528 , A61B5/06 , A61B5/1126 , A61F2/32 , A61F2/36 , A61F2/3662 , A61F2/468 , A61F2002/30448 , A61F2002/30698 , A61F2002/3233 , A61F2002/3493 , A61F2002/3611 , A61F2002/3625 , A61F2002/4631 , A61F2002/48 , A61F2002/488 , A61F2220/005 , A61F2250/008 , A61F2310/00011 , A61F2310/00023 , A61F2310/00029 , A61F2310/00179
摘要： In a total hip replacement, a stem of a femoral component is disposed in a patient's thigh bone with a ball extending in such femoral component above the stem. The ball is disposed in a hemispherical cup positioned in the patient's pelvis and enveloping the ball for frontal movement of the ball relative to the cup. A low-friction liner (e.g., plastic or ceramic) is disposed at the bottom of the cup. To determine whether the ball is properly positioned in the cup, a first member (e.g., a coil) is disposed on the bottom of the liner. A second member (e.g., a patch defining a loop) is disposed on the patient's thigh in operatively coupled (e.g. magnetic) relationship to the first member. The operative coupling between the members is variable in accordance with variations in the disposition of the ball in the cup. When the first and second members are respectively a coil and a patch, the coil and a capacitance may be fixed in the patient's body in a circuit resonant at a particular frequency. The patch may be included in electrical circuity disposed externally on the patient's body and energizable by a source (e.g., a battery) disposed externally on the patient's body. This circuity may be resonant at a frequency variable in accordance with variations in the magnetic coupling between the coil and the patch. A sensory indication may be provided when the resonant frequency of the circuity varies outside of particular limits. This indicates that the hip replacement may not be functioning properly in regard to subluxation, dislocation, or excessive material wear.
摘要翻译：在全髋关节置换中，将股骨部件的茎部设置在患者的大腿骨中，并且在杆上方的股骨部件中延伸有球。球设置在位于患者骨盆中的半球形杯中，并且包围球以使球相对于杯的正面运动。低摩擦衬垫（例如，塑料或陶瓷）设置在杯的底部。为了确定球是否适当地定位在杯中，第一构件（例如，线圈）设置在衬套的底部上。与第一构件可操作地耦合（例如磁性）的关系，将第二构件（例如，限定环的修补件）设置在患者的大腿上。根据杯中的球的配置的变化，构件之间的操作联接是可变的。当第一和第二构件分别是线圈和贴片时，线圈和电容可以以特定频率谐振的电路固定在患者身体中。补片可以被包括在设置在患者身体外部的电气电路中，并且可由设置在患者身体外部的源（例如，电池）激励。该电路可以根据线圈和贴片之间的磁耦合的变化在可变频率下谐振。当电路的谐振频率在特定极限之外变化时，可以提供感觉指示。这表明髋关节置换可能在半脱位，脱位或过多的材料磨损方面不能正常工作。

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