[특허]Apparatus for, and method of, detecting dislocations and material wear in hip replacements

[미국특허] Apparatus for, and method of, detecting dislocations and material wear in hip replacements 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61F-002/30 A61F-002/32 A61F-002/76
출원번호	US-0971706 (1997-11-17)
발명자 / 주소	Schneider John E. Walker Richard H. Norris Elwood G.
출원인 / 주소	Norris Elwood G.
대리인 / 주소	Roston
인용정보	피인용 횟수 : 51 인용 특허 : 9

초록 ▼

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.

대표청구항 ▼

[ We claim:] [1.] In combination for determining in a patient's hip replacement the positional interrelationship between a ball at the top of a stem in the patient's thigh and a socket in the patient's pelvis, the socket including a cup and a liner near the bottom of the cup,a coil at the bottom of the liner;a member disposed on the patient's body near the patient's thigh and in magnetizably coupled relationship to the coil for producing a signal having characteristics dependent upon the positioning of the ball in the socket, andfirst means operatively coupled to the member for producing a signal having characteristics dependent at each instant upon the magnetically coupled relationship at that instant between the coil and the member.

이 특허에 인용된 특허 (9) 인용/피인용 타임라인 분석

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Glassman Edward (New York NY) Hanson William A. (Mountain View CA) Kazanides Peter (Davis CA) Mittelstadt Brent D. (Placerville CA) Musits Bela L. (Hopewell Junction NY) Paul Howard A. (Loomis CA) Ta, Image-directed robotic system for precise robotic surgery including redundant consistency checking.
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Bisek Joseph P. (Madison WI) Hanson James A. (Madison WI) Mazess Richard B. (Madison WI), Method for periprosthetic bone mineral density measurement.
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Ypma Johannes F. A. M. (Oudkerk NLX) Huiskes Hendrik W. J. (Wijchen NLX) Jaspers Pierre J. T. M. (Utrecht NLX), Method of shaping an endo-prosthesis, a femoral head prosthesis, an acetabulum prosthesis and a method of fixing a femor.
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Laurent Michel P. ; Parcell Jerry ; McDonald Kent, Orthopaedic implant having a metallic bearing surface.
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Scarborough Nelson L. (Ocean NJ), Surgical implant containing a resorbable radiopaque marker and method of locating such within a body.
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Waggener Herbert A., Wear resistant ball and socket joint.
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이 특허를 인용한 특허 (51) 인용/피인용 타임라인 분석

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Baym, Michael H.; Hyde, Roderick A.; Sweeney, Elizabeth A.; Wood, Jr., Lowell L., Apparatus, system, and method for controlling movement of an orthopedic joint prosthesis in a mammalian subject.
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A	생활필수품
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Apparatus for, and method of, detecting dislocations and material wear in hip replacements 원문보기