The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 1998
Filed:
Apr. 17, 1995
Michael John Young, Ashburton, GB;
Orthosonics Ltd., Ashburton, GB;
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.