Surgery – Instruments – Orthopedic instrumentation
Patent
1997-07-10
1999-03-23
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 86, A61B 1756
Patent
active
058853014
ABSTRACT:
An elongate tool bit is disclosed for ultrasonic excitation to remove plastics cement around a prosthetic implant in bone, as in a hip-joint replacement procedure. The tool bit features a stem portion with a distal-end claw formation, in the nature of a proximally open cup, having a convexly rounded distal end, with longitudinal apertures that provide through-passage for proximally directed flow of melted plastic. When the claw formation is driven via longitudinal vibration of the stem, cement melts at and near the convex distal end of the claw formation, and melted plastic passes through the apertures in the proximal direction to accumulate within and proximally of the claw formation. The claw formation features a relatively sharp proximally facing lip, thereby permitting the distal end of the tool to additionally serve an ultrasonic scraper function against the imbedded outer surface of the stud part of an appliance which requires replacement; alternatively, the tool can be used to ultrasonically remove plastics cement from the embedment of a distal fragment of a prosthetic appliance which has been broken, thereby aiding a procedure to remove the embedded fragment.
REFERENCES:
patent: 2528941 (1950-11-01), Bassett et al.
patent: 5151099 (1992-09-01), Young et al.
Buiz Michael
Orthosonics Ltd.
Shai Daphna
LandOfFree
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