Means for removal of osteal prostheses
AssigneeOrthosonics Limited
InventorMichael J. R. Young
Life of this patent
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Abstract
A relatively massive annular body is driven in radial-mode resonant oscillation by an ultrasonic driver that is fixed to the periphery of the annular body, with the axis of its ultrasonic drive oriented for intersection with the central axis of the annular body. A selected chucking device within the bore of the annular body is adapted to engage part of a prosthetic device, to which the resonant oscillation is imparted, for melting bone cement and for severing bony ingrowth into the prosthetic, thus permitting immediate retraction of the prosthetic from its pre-existing implantation in a living bone.
Claims27
A tool for use in revision arthroplasty, wherein a prosthetic member to be removed is encumbered by bone cement and exposes a head adapted for assembled joint articulation, said tool comprising a circumferentially continuous annular body having a central bore, chuck means adapted for selectively locked engagement of an exposed prosthetic head to the bore of said body, and an ultrasonic driver having a central axis of mechanically resonant oscillation, said driver being connected to said body with its oscillation axis directed generally radially inward with respect to said central bore.
A tool for use in revision arthroplasty wherein a prosthetic member to be removed is encumbered by bone cement and exposes a head that is adapted for assembled joint articulation, said tool comprising a circumferentially continuous annular body having a central bore, chuck means adapted for removably locked central positioning of an exposed prosthetic head within the bore of said body, and an ultrasonic driver connected to said body with its oscillation axis directed generally radially inward with respect to said central bore.
A tool for use in revision arthroplasty wherein a prosthetic member to be removed is encumbered by bone cement and exposes a ball-shaped head that is adapted for assembled joint articulation, said tool comprising a circumferentially continuous annular body having a central bore, chuck means adapted for removably locked central positioning of an exposed ball-shaped prosthetic head at a location within the bore of said body, and an ultrasonic driver connected to said body with its oscillation axis directed generally radially inward with respect to said location.
A radial-mode resonant device comprising a circumferentially continuous annular body having a bore on a central axis, said bore having a convergent taper adapted for removable circumferentially continuous retention of an axially inserted tool element, and an ultrasonic driver having its own central axis of mechanically resonant oscillation, said driver being connected to said annular body with its oscillation axis directed generally radially inward with respect to the central axis of said body.
A radial-mode resonant device comprising a circumferentially continuous annular body having a bore on a central axis, a tweezer tool element having elongate opposed legs extending from a connected proximal end to independent but closely adjacent distal ends, said connected proximal end being supported in radially inwardly stressed relation by confining engagement to said body within said bore, with said legs projecting axially away from said body, and an ultrasonic driver having its own axis of mechanically resonant oscillation, said driver being connected to said annular body with its oscillation axis directed generally radially inward with respect to the central axis of said bore and therefore of bore engagement to said tool element.
Dependencies are inferred from the claim text.