Bone rasp apparatus and method

Patent metadata

Field	Value
Publication number	US-9775628-B2
Application number	US-201314104249-A
Country	US
Kind code	B2
Filing date	Dec 12, 2013
Priority date	Dec 17, 2012
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

In some examples, an apparatus includes a working surface including at least one material removal member. The material removal member is configured to remove at least some of a first portion of a first material. A protrusion extends outwardly from the working surface. The protrusion extends beyond the at least one material removal member by a first distance. The protrusion is configured to inhibit the at least one material removal member from removing at least a second portion of the first material. The second portion has a thickness substantially equal to the first distance.

First claim

The claimed invention is:

1. An apparatus used to remove a first material comprising at least one of a spongy bone material and a bone marrow material from within a femur, in order to prepare and size a channel within the femur for placement of a stem portion of an artificial hip joint within the channel, wherein the femur comprises the first material and a second material comprising a hardened outer layer of compact bone, the apparatus comprising:
a femoral stem body having a distal most end and a proximal most end, wherein the femoral stem body gradually tapers from the proximal most end toward the distal most end and has a shape similar to the stem portion of the artificial hip joint for placement within the channel;
a working surface located on the femoral stem body including at least one material removal member, the material removal member being configured to remove at least some of a first portion of the first material; and
a protrusion extending outwardly from the working surface, the protrusion extending beyond the at least one material removal member by a first distance, the protrusion configured to inhibit the at least one material removal member from removing at least a second portion of the first material, the second portion having a thickness substantially equal to the first distance.

2. The apparatus of claim 1 , wherein the protrusion is configured to move within or through the first material and abut the second material, the first and second materials including adjacent layers, wherein the protrusion is configured to space the material removal member from the second material by the first distance to inhibit the at least one material removal member from removing the second portion of the first material.

3. The apparatus of claim 1 , wherein the working surface includes a plurality of material removal members.

4. The apparatus of claim 1 , wherein the at least one material removal member includes a tooth extending from the working surface.

5. The apparatus of claim 1 , wherein the protrusion extends along a length of the working surface.

6. The apparatus of claim 1 , wherein the working surface includes more than one face, the faces oriented differently from one another.

7. The apparatus of claim 6 , wherein each face of the more than one face of the working surface includes at least one protrusion.

8. The apparatus of claim 1 , wherein the working surface includes two or more protrusions extending outwardly from the working surface, the two or more protrusions being spaced from one another.

9. The apparatus of claim 8 , wherein the working surface includes the at least one material removal member disposed between the two or more protrusions.

10. The apparatus of claim 1 , wherein the at least one material removal member is configured such that movement of the apparatus into the femur allows removal of at least some of the first portion of the first material.

11. The apparatus of claim 10 , wherein movement of the apparatus out of the femur does not result in removal of the first portion of the first bone material.

12. The apparatus of claim 1 , wherein the protrusion is removable from the working surface on the femoral stem body and comprises one of a plurality of differently-sized interchangeable protrusions.

13. An apparatus used to remove a first bone material comprising at least one of a spongy bone material and a bone marrow material from within a femur, in order to prepare and size a channel within the femur for placement of a stem portion of an artificial hip joint within the channel, wherein the femur comprises the first bone material and a second bone material comprising a hardened outer layer of compact bone, the apparatus comprising:
a femoral stem body having a distal most end and a proximal most end, wherein the femoral stem body gradually tapers from the proximal most end toward the distal most end and has a shape similar to the stem portion of the artificial hip joint for placement within the channel;
a working surface located on the femoral stem body including a plurality of teeth, the teeth being configured to remove at least some of a first portion of the first bone material; and
a protrusion extending outwardly from the working surface, the protrusion extending beyond the teeth by a first distance, the protrusion configured to inhibit the teeth from removing at least a second portion of the first bone material, the second portion having a thickness substantially equal to the first distance, wherein the protrusion is configured to move within or through the first bone material and abut the second bone material, the first and second bone materials including adjacent layers, wherein the protrusion is configured to space the teeth from the second bone material by the first distance to inhibit the teeth from removing the second portion of the first bone material.

14. The apparatus of claim 13 , wherein the working surface includes more than one face, the faces oriented differently from one another.

15. The apparatus of claim 14 , wherein each face of the more than one face of the working surface includes at least one protrusion.

16. The apparatus of claim 14 , wherein each face of the working surface includes two or more protrusions extending outwardly from the face of the working surface, the two or more protrusions being spaced from one another.

17. The apparatus of claim 13 , wherein the protrusion includes an elongate rib extending along a length of the working surface substantially parallel to a longitudinal axis of the apparatus.

18. The apparatus of claim 13 , wherein the teeth are configured such that movement of the apparatus into the femur allows removal of at least some of the first portion of the first bone material.

19. The apparatus of claim 18 , wherein movement of the apparatus out of the femur does not result in removal of the first portion of the first bone material.

20. The apparatus of claim 13 , wherein the protrusion is removable from the working surface on the femoral stem body and comprises one of a plurality of differently-sized interchangeable protrusions.

Assignees

• Zimmer Inc

Inventors

• Monaghan Matthew E

Classifications

• A61B17/1668

  for the upper femur (A61B17/164 takes precedence) · CPC title

• A61B17/1659 Primary

  Surgical rasps, files, planes, or scrapers · CPC title