Fastening system for prostheses
OwnerAlastair Youngerinventor
Life of this patent
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Abstract
A system for fastening prosthetic implants such as ankle prostheses is provided. The ankle prosthesis includes: a talar implant having a body for mounting to a top of a talus and with at least one talar fastening hole; a tibial implant having a plate for mounting to a bottom of a tibia, a flange extending from the plate for bearing against an anterior surface of the tibia, the flange comprising at least one tibial fastening hole; a mobile bearing for positioning between the talar implant and the tibial implant; and a plurality of fasteners for locking engagement with the at least one talar fastening hole and the at least one tibial fastening hole, each of the fasteners comprising locking means and an elongated unthreaded body.
Claims34
An ankle prosthesis comprising:
- a talar implant comprising a body for mounting to a top of a talus, the body comprising at least one talar fastening hole;
- a tibial implant comprising a plate for mounting to a bottom of a tibia;
- a flange extending from the plate for bearing against an anterior surface of the tibia, the flange comprising at least one tibial fastening hole;
- a mobile bearing for positioning between the talar implant and the tibial implant;
- and
- a plurality of fasteners for locking engagement with the at least one talar fastening hole and the at least one tibial fastening hole for fastening the talar implant and the tibial implant to the talus and the tibia respectively, each of the fasteners comprising locking means and an elongated unthreaded body.
A system for fastening a prosthesis to bone, the system comprising:
- a plurality of fastening holes, each fastening hole comprising
- a threaded arc section comprising internal threads;
- and
- an unthreaded arc section;
- a plurality of fasteners for locking engagement with the fastening holes, each of the fasteners comprising
- a head having external threads;
- and
- an elongated unthreaded body.
An ankle prosthesis for revision surgery or bone loss surgery comprising:
- a talar implant comprising
- a dome-shaped body having an upper anterior surface and a substantially flat bottom surface;
- at least one talar fastening hole extending in a downward and posterior direction from the upper anterior surface to the flat bottom surface;
- a tibial implant;
- a mobile bearing for positioning between the talar implant and the tibial implant;
- and
- at least one fastener for locking engagement with the at least one talar fastening hole, the at least one fastener comprising locking means and an elongated unthreaded body.
A jig for drilling holes for prosthesis fasteners with a cannulated drill, the jig comprising:
- a prosthetic implant comprising a threaded fastener hole;
- a guide comprising a longitudinal bore and an externally threaded distal end for threadingly engaging the fastener hole;
- a cannula for insertion in the longitudinal bore of the guide, the cannula comprising an longitudinal bore;
- and
- a guidewire for insertion in the longitudinal bore of the cannula, the guidewire for guiding the cannulated drill.
A method of fastening a prosthesis to a bone, the method comprising:
- (a) precutting the bone to provide a bone surface complementary to a bone-contacting surface of the prosthesis;
- (b) positioning the prosthesis on the bone surface;
- (c) implanting a threaded guidewire into a location of bone through a fastening hole of the prosthesis positioned on the bone;
- (d) drilling a drill hole in the bone through the fastening hole using a cannulated drill guided by the threaded guidewire;
- (e) inserting through the fastening hole and into the drill hole a fastener comprising a locking head and an unthreaded elongated body;
- and
- (f) locking the head of the fastener in the fastening hole to fasten the prosthesis to the bone.
Dependencies are inferred from the claim text.