US 7,141,067 B2Granted

Intercalary implant

AssigneeDePuy Products, Inc.

InventorsMichael C. Jones, Natalie S. Heck

Life of this patent

Estimating the term…

Loading patent…

Abstract

An intercalary implant has two stem members and a collar. One stem member includes a stem portion to be received in the intramedullary canal of a native end portion of a long bone and a threaded male portion to be outside of the intramedullary canal. The second stem member also includes a stem portion to be received in the intramedullary canal of the opposite native end portion of the long bone. The second stem member has a spacer portion and a shoulder to be outside of the intramedullary canal. The collar has an annular base portion with an opening and a cylindrical female threaded portion. When assembled, collar connects the first and second stem members and the implant spans a gap in the shaft of the long bone. The parts can be assembled without distracting the native end bone portions in the proximal-distal direction to prevent damage to soft tissue around the native end bone portions.

Claims16

Dependent claims

An intercalary implant for use in replacing a missing portion of the shaft of a long bone, wherein the long bone includes native proximal and distal portions having intramedullary canals, the implant comprising:

a first stem member including a stem portion to be received in the intramedullary canal of one of the native portions of the long bone, the first stem member including a threaded male portion to be positioned outside of the intramedullary canal;
a second stem member including a stem portion to be received in the intramedullary canal of the other of the native portions of the long bone, the second stem member further including a spacer portion to be positioned outside of the intramedullary canal and a shoulder to be positioned outside of the intramedullary canal, the spacer portion being between the stem portion and the shoulder;
and
a collar including an annular base portion with an opening and a cylindrical portion open at one end, the cylindrical portion having a threaded interior surface to receive and mate with the threaded male portion of the first stem member;
wherein the collar receives part of the second stem member through the opening in the base portion of the collar, and the collar is movable in a proximal-distal direction along at least part of the length of the spacer portion of the second stem member between an extended position and a retracted position;
wherein in the extended position the annular base portion of the collar is spaced from the stem portion of the second stem member and abuts the shoulder of the second stem member and the cylindrical portion of the collar extends over and beyond the shoulder of the second stem member;
wherein in the retracted position the collar is positioned so that at least part of the shoulder is exposed;
and
wherein the shoulder and the opening of the annular base portion of the collar are sized and shaped so that when the collar is threaded onto the threaded male portion of the first stem member the position of the first stem member is fixed with respect to the position of the second stem member.

6 more elements

A surgical kit for use in treating a long bone of a patient wherein a portion of the shaft of the long bone is missing or resected and native proximal and distal portions of the long bone remain, the kit comprising:

a first stem member including a stem portion and a threaded male portion;
a second stem member having an overall axial dimension and including a stem portion, a spacer portion having an axial dimension and a radial dimension, and a shoulder having an axial dimension and a radial dimension, the spacer portion being between the stem portion and the shoulder, the radial dimension of the shoulder being greater than the radial dimension of the spacer portion;
and
a collar member including an annular base portion with an opening and a cylindrical portion open at one end, the cylindrical portion having a threaded interior surface to receive and mate with the threaded male portion of the first stem member, the cylindrical portion having an interior radial dimension and an axial dimension, the annular base portion having a radial dimension and the opening of the annular base portion having a radial dimension;
wherein the radial dimension of the shoulder of the second stem member is greater than the radial dimension of the opening in the annular base portion of the collar;
wherein the interior radial dimension of the cylindrical portion of the collar is greater than the radial dimension of the spacer of the second stem member and greater than the radial dimension of the shoulder of the second stem member;
wherein the axial dimension of the cylindrical portion of the collar is greater than the axial dimension of the shoulder of the second stem member.

4 more elements

Dependencies are inferred from the claim text.