Press fit stem
AssigneeHowmedica Osteonics Corp.
InventorDamon J. Servidio
Life of this patent
Estimating the term…
Abstract
A method of implanting a medical implant includes resecting a long bone along a shaft of the bone so as to form a resected surface and remove a metaphysis of the bone. A tapered bore is reamed through the resected surface of the long bone and into an intramedullary canal thereof. A tapered portion of a stem of a medical implant is fully seated within the tapered bore so as to form a press-fit between the tapered portion of the stem and the long bone and so that a collar disposed at an end of the stem is offset from the resected surface so as to form a gap between the resected surface and the collar.
Claims21
A method of implanting a medical implant comprising the steps of:
- reaming a tapered bore through an end surface of a long bone and into an intramedullary canal of the long bone to a first depth, the tapered bore having a first diameter at an entry point at the surface of the bone;
- reaming a counter bore through the end surface to form a proximally-facing surface at a bottom of the counter bore inside the long bone at a second depth disposed between the end surface and the first depth, the counter bore having a third diameter that is greater than the first diameter;
- and
- fully seating a tapered portion of a stem of a medical implant into the tapered bore so as to form a press-fit between the tapered portion of the stem and the long bone, the medical implant further comprising a collar disposed about at least a portion of the stem, the collar having a first end and a second end, the first end having a second diameter greater than the first diameter and less than the third diameter and having an end surface defining a first extent of the collar, and
- wherein, once the tapered portion of the stem is fully seated within the tapered bore, a gap is formed within the counter bore between the end surface of the collar and the proximally-facing surface of the counter bore.
A method of implanting a medical implant comprising the steps of:
- resecting a long bone along a diaphysis thereof so as to form a resected surface and to remove a metaphysis, an epiphysis, and a portion of the diaphysis of the long bone;
- reaming a tapered bore through the resected surface of the long bone and into an intramedullary canal thereof;
- reaming a counter bore through the resected surface of the long bone to form a proximally-facing surface at a bottom of the counter bore, wherein the counter bore is coaxial to the tapered bore;
- and
- fully seating a tapered portion of a stem of a medical implant into the tapered bore so as to form a press-fit between the tapered portion of the stem and the long bone and so that a collar disposed at an end of the stem is offset from the proximally-facing surface so as to form a gap within the counter bore between the proximally-facing surface and the collar.
Dependencies are inferred from the claim text.