Antibiotic bone cement spacer
AssigneeHowmedica Osteonics Corp.
InventorRobert W. Klein
Life of this patent
Estimating the term…
Abstract
A temporary femoral implant system has a porous mold and a femoral component. The system fits at least partially in a femoral cavity. The mold has a wall with an interior surface and an exterior surface forming an interior space for receiving an antibiotic bone cement. The mold allows the antibiotic to diffuse through the wall to the exterior surface. The femoral component has a stem portion received within the mold. A method of using the implant system includes providing an implant system comprising a mold and a femoral component, inserting the mold into the femoral cavity with the exterior surface facing the femoral cavity, inserting the stem portion of a femoral component into the interior space of the mold and filling the interior space of the mold with an antibiotic bone cement.
Claims26
A femoral component implant system for use with antibiotic bone cement comprising:
- a flexible mold adapted to fit at least partially in a femoral cavity, the mold having a porous wall with an interior surface and exterior surface, wherein the wall forms an interior space for receiving a bone cement composition comprising uncured bone cement and an antibiotic, wherein the porous wall allows the antibiotic to diffuse from the interior surface and to the exterior surface;
- a femoral component having a stem portion to fit at least partially within the interior space of the mold and a head portion coupled to the stem portion including a portion for contacting and sealing a proximal end of the mold, wherein the femoral component further comprises a head portion with at least a partially spherical shape adapted to fit into an acetabular cavity, and wherein the head portion includes an injection port with an opening extending through the head portion adapted to allow the bone cement composition to be injected into the interior space of the mold.
A method of treating a bone infection in a bone cavity, the method comprising:
- providing a bone implant system comprising a flexible porous mold and a bone implant component, the bone implant component includes a stem portion adapted to fit at least partially in an interior space in the mold and a head portion coupled to the stem portion, the head portion including a distal area for contacting and sealing a proximal end of the mold;
- inserting at least a portion of the implant system into the bone cavity with an exterior surface of the mold contacting a femoral cavity;
- sealing the proximal end of the mold to the distal area of the head portion;
- filling at least a portion of the interior space of the mold with an uncured antibiotic bone cement composition through a passageway in the head portion;
- and
- allowing the antibiotic to diffuse through the porous mold to treat the infection.
A femoral component implant system for use with antibiotic bone cement comprising:
- a flexible mold adapted to fit at least partially in a femoral cavity, the mold having a porous wall with an interior surface and exterior surface, wherein the wall forms an interior space for receiving a bone cement composition comprising uncured bone cement and an antibiotic, wherein the porous wall is adapted to allow the antibiotic to diffuse from the interior surface and to the exterior surface;
- and
- a femoral component having a stem portion to fit at least partially within the interior space of the mold and seal a proximal end of the mold wherein the femoral component further comprises a head portion with at least a partially spherical shape adapted to fit into an acetabular cavity wherein the head portion includes an injection port with an opening extending through the head portion adapted to allow the bone cement composition to be injected into the interior space of the mold.
A femoral component implant system for use with antibiotic bone cement comprising:
- a flexible mold adapted to fit at least partially in a femoral cavity, the mold having a porous wall with an interior surface and exterior surface, wherein the wall forms an interior space for receiving a bone cement composition comprising uncured bone cement and an antibiotic, wherein the porous wall allows the antibiotic to diffuse from the interior surface and to the exterior surface;
- a femoral component having a stem portion to fit at least partially within the interior space of the mold and a head portion coupled to the stem portion including a portion for contacting and sealing a proximal end of the mold, wherein the femoral component further comprises a head portion with at least a partially spherical shape adapted to fit into an acetabular cavity, and wherein the head portion includes an injection port with an opening extending through the head portion adapted to allow the bone cement composition to be injected into the interior space of the mold;
- wherein the femoral component further comprises a head portion with at least a partially spherical shape adapted to fit into an acetabular cavity;
- wherein the head portion includes an attachment mechanism adapted to detachably couple an open end of the mold to the head;
- and
- wherein the attachment mechanism includes an adjustment mechanism adapted to allow axial adjustment of a neck length of the femoral component.
Dependencies are inferred from the claim text.