In vivo joint space measurement device and method
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United States of America Patent
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Mar 27, 2007
Grant Date -
Jan 13, 2005
app pub date -
Jul 9, 2004
filing date -
Jul 11, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A joint endoprosthesis system has first and second prosthetic components. The second prosthetic component has a bearing surface. The interface of the bearing surface and the first prosthetic component defines the joint articulation. A signal source and sensor are affixed on opposite sides of the joint articulation. The signal source generates a first signal that is received by the sensor. The sensor generates a second signal that has a characteristic that varies depending on the distance between the sensor and the signal source. A transmitter transmits a signal. The signal has a characteristic that varies depending on the characteristic of the second signal. This system can be used to measure a dimension of the joint space and to determine whether a dimension of the joint space has changed over time. The system may alternatively use magnets and magnetic sensors.
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