Prosthetic implant support structure

Patent metadata

Field	Value
Publication number	US-10201426-B2
Application number	US-56027606-A
Country	US
Kind code	B2
Filing date	Nov 15, 2006
Priority date	Aug 27, 2001
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A prosthetic system that includes a prosthetic implant and a support structure secured to an inner surface of the cavity in the end of the bone is disclosed. The support structure defines a channel that extends through the length of the support structure. The prosthetic implant is received in the channel, and a portion of the prosthetic implant is secured to an inner surface of the channel by an adhesive. The stem of the prosthesis beyond the channel may be cemented or uncemented. The support structure may have an approximately funnel shape. The support structure may be a hollow porous cylindrical sleeve. The support structure may comprise a pair of partially hemispherical components arranged in spaced apart relationship thereby defining a channel between the pair of components. The support structure may comprise a plurality of pedestals secured to the inner surface of the cavity of the bone.

First claim

What is claimed is:

1. A prosthetic system for implantation in a cavity in an end of a bone, the prosthetic system comprising:
a prosthetic implant; and
a support structure for occupying an area in a cavity in an end of a bone, the support structure formed separately from said prosthetic implant for subsequent connection to said prosthetic implant, said support structure consisting essentially of a porous metal alloy and capable of being impacted and wedged, by itself, into the cavity in the end of the bone for obtaining a press fit of the support structure in the cavity prior to connecting said support structure to said prosthetic implant, the support structure having a support structure inner surface defining an axial channel having an axial extent that extends through the length of the support structure, wherein said porous metal alloy is a bone ingrowth-receptive material with a porous structure for encouraging bone ingrowth and attachment throughout the support structure for restoring lost bone stock in the cavity in the end of the bone in the area occupied by the support structure when the support structure is implanted in the cavity in the end of the bone,
wherein the prosthetic implant is receivable in the axial channel of the support structure such that a portion of the prosthetic implant extends through the axial channel of the support structure and is securable to the inner surface of the support structure by an adhesive disposed between the prosthetic implant and the support structure along the axial channel of the support structure.

2. The prosthetic system of claim 1 wherein:
the support structure has an end surface which surrounds the axial channel at a first end of the support structure, and
a portion of the prosthetic implant is secured to the end surface of the support structure by an adhesive.

3. The prosthetic system of claim 1 wherein:
the prosthetic implant has a body and an attached stem extending away from the body, and
at least a portion of an outer surface of the stem of the prosthetic implant is received in the axial channel of the support structure and is secured to the inner surface of the support structure by the adhesive.

4. The prosthetic system of claim 3 wherein:
at least a portion of the outer surface of the stem adjacent a distal end of the stem of the prosthetic implant is securable to an inner surface of the cavity in the end of the bone.

5. The prosthetic system of claim 1 wherein:
at least a portion of the inner surface of the support structure is textured.

6. The prosthetic system of claim 1 wherein:
at least a portion of an end surface of the support structure adjacent a first end of the support structure is textured.

7. The prosthetic system of claim 1 wherein:
a perimeter region of a bearing surface of the prosthetic implant is securable to an end surface of the bone.

8. The prosthetic system of claim 1 wherein:
the support structure is a hollow sleeve having a sloped outer surface with a first end of the hollow sleeve having a comparatively larger perimeter than an opposite second end of the hollow sleeve.

9. The prosthetic system of claim 1 wherein:
the support structure is formed from a porous metal alloy selected from the group consisting of titanium alloys, cobalt-chromium alloys, stainless steel alloys and tantalum alloys.

10. The prosthetic system of claim 1 wherein:
the support structure is formed from a porous tantalum alloy.

11. The prosthetic system of claim 1 wherein the support structure comprises:
a hollow cylindrical sleeve.

12. The prosthetic system of claim 11 wherein:
the sleeve includes two sections, one of the sections having a smaller outside diameter.

13. The prosthetic system of claim 11 wherein:
the prosthetic implant has a body and a stem extending away from the body, and at least a portion of an outer surface of the stem of the prosthetic implant is received in the axial channel of the support structure and is secured to the inner surface of the support structure by the adhesive.

14. A prosthetic system for implantation in a cavity in an end of a bone, the prosthetic system comprising:
a prosthetic implant having a body which forms part of a mechanical joint and an attached stem extending away from the body; and
a hollow sleeve for occupying an area in a cavity in an end of a bone, the hollow sleeve formed separately from said prosthetic implant for subsequent connection to said prosthetic implant, said hollow sleeve consisting essentially of a porous metal alloy and capable of being impacted and wedged, by itself, into the cavity in the end of the bone for obtaining a press fit of the hollow sleeve in the cavity prior to connecting said hollow sleeve to said prosthetic implant, said hollow sleeve having a sleeve inner surface which defines an axial channel that extends through the length of the sleeve, the sleeve being securable to an inner surface forming the cavity in the end of the bone, wherein said porous metal alloy is a bone ingrowth-receptive material with a porous structure for encouraging bone ingrowth and attachment throughout the hollow sleeve for restoring lost bone stock in the cavity in the end of the bone in the area occupied by the hollow sleeve when the hollow sleeve is implanted in the cavity in the end of the bone,
wherein at least a portion of an outer surface of the stem of the prosthetic implant is receivable in the axial channel of the sleeve and is securable to the sleeve inner surface by an adhesive.

15. The prosthetic system of claim 14 wherein:
the hollow sleeve is formed from a porous metal alloy selected from the group consisting of titanium alloys, cobalt-chromium alloys, stainless steel alloys and tantalum alloys.

16. The prosthetic system of claim 14 wherein:
the hollow sleeve includes a first longitudinal section with a comparatively smaller diameter than a second longitudinal section of the hollow sleeve.

17. The prosthetic system of claim 14 wherein:
the hollow sleeve is formed from a porous tantalum alloy.

18. The prosthetic system of claim 1 wherein:
the adhesive is bone cement.

19. The prosthetic system of claim 14 wherein:
the adhesive is bone cement.

20. A prosthetic system for implantation in a cavity in an end of a bone, the prosthetic system comprising:
a prosthetic implant having a body which forms part of a mechanical joint and an attached stem extending away from the body;
a hollow sleeve for occupying an area in a cavity in an end of a bone, the hollow sleeve formed separately from said prosthetic implant for subsequent connection to said prosthetic implant, said hollow sleeve consisting essentially of a porous metal alloy and capable of being impacted and wedged, by itself, into the cavity in the end of the bone for obtaining a press fit of the hollow sleeve in the cavity prior to connecting said hollow sleeve to said prosthetic implant, said hollow sleeve having a sleeve inner surface which defines an axial channel that extends through the length of the sleeve, the sleeve being securable to an inner surface forming the cavity in the end of the bone, wherein said porous metal alloy is a bone ingrowth-receptive material with a porous structure for encouraging bone ingrowth and attachment throughout the hollow sleeve for restoring lost bone stock in the cavity in the end of the bone in the area occupied by the hollow sleeve when the hollow sleeve is implanted in the cavity in the end of the bone, with at least a portion of an outer surface of

Assignees

• Hanssen Arlen D
• Lewallen David G
• Zimmer Inc

Inventors

• Hanssen Arlen D
• Lewallen David G

Classifications

• A61F2002/30273

  pyramidal · CPC title

• A61F2002/30593

  hollow · CPC title

• A61F2002/30245

  Partial spheres · CPC title

• A61F2002/30131

  horseshoe- or crescent- or C-shaped or U-shaped · CPC title

• A61F2002/30777

  Oblong apertures · CPC title