Tool bit for use in ultrasonic removal of plastics embedment of

Details Tool bit for use in ultrasonic removal of plastics embedment of Tool bit for use in ultrasonic removal of plastics embedment of

1995-04-17

1998-05-12

Buiz, Michael

Surgery

Instruments

Orthopedic instrumentation

606 86, 606 87, 128898, A61B 1756

Patent

active

057498776

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: 4248232 (1981-02-01), Engelbrecht et al.
patent: 5019083 (1991-05-01), Klapper et al.
patent: 5151099 (1992-09-01), Young et al.
patent: 5167619 (1992-12-01), Wuchinich
patent: 5324297 (1994-06-01), Hood et al.
patent: 5330481 (1994-07-01), Hood et al.

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