Distal shaft with fast and slow screw threads
OwnerRonald Sekelinventor
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Abstract
A femoral prosthesis adapted for insertion into the medullary cavity of a femur. The prosthesis including a distal shaft, a neck portion detachable from the distal shaft and a joint head detachable from the neck portion. The distal shaft having two spaced tapered threaded portion thereabout with differing pitch to prevent undesired counter rotation of the prosthesis thereby preventing axial withdrawal of the distal shaft from the femur.
Claims10
A distal shaft for use with a hip prosthesis which includes a detachable elbow component and a detachable head component, the shaft being insertable wholly within and in axial alignment with a medullary cavity of a femur, the shaft having a flared proximal end provided with a tapered recess in axial alignment with the shaft for receiving the elbow component and also having a tapered distal end, the shaft being provided with a first helical thread and a second helical thread spaced apart from one another.
Dependencies are inferred from the claim text.