Multipiece implants formed of bone material

Abstract

The present invention relates to an implant comprising two or more bone fragments that are combined to form a single unit. Cancellous bone or cortical bone is removed from a source and fashioned into bone components with desirable shapes and sizes. The bone components may be integrated to form implants for implantation in the body. Bone stock may be formed by combining sections of various bones of the body, and the bone stock may be further fashioned for use as implants with particular geometries.

1 . An implant comprising a body having two outer annular members and at least one inner annular member, wherein at least one of the annular members is formed from bone and the annular members are coupled together to define a central chamber.  
   
   
       2 . The implant of  claim 1 , wherein each annular member has at least one surface that is press-fit with the surface of another annular member.  
   
   
       3 . The implant of  claim 2 , wherein the outside diameter of the outer annular members is smaller than the outside diameter of the at least one inner annular member.  
   
   
       4 . The implant of  claim 2 , wherein the implant is symmetrical about an innermost annular member, the diameter of the implant progressively decreasing from the innermost annular member to each outer annular member.  
   
   
       5 . The implant of  claim 2 , wherein the central chamber is packed with at least one of bone material and bone inducing substances.  
   
   
       6 . The implant of  claim 2 , wherein at least one annular member is formed of cancellous bone and at least one annular member is formed of cortical bone.  
   
   
       7 . The implant of  claim 2 , wherein the annular member bones comprise at least one of autograft, allograft, and xenograft bone tissue.  
   
   
       8 . The implant of  claim 7 , wherein the bone tissue of at least one bone is partially demineralized or demineralized.  
   
   
       9 . The implant of  claim 2 , wherein a plurality of annular members are coupled together with at least one fastener.  
   
   
       10 . The implant of  claim 9 , wherein the at least one fastener is selected from a screw, key, pin, peg, rivet, cotter, nail, spike, bolt, stud, staple, boss, clamp, clip, dowel, stake, hook, anchor, tie, band, crimp, and wedge.  
   
   
       11 . The implant of  claim 2 , wherein a plurality of annular members are bonded together with a bonding agent.  
   
   
       12 . The implant of  claim 2 , wherein at least one of the annular members is at least partially dehydrated to fit against a surrounding mating surface.  
   
   
       13 . The implant of  claim 2 , wherein at least one of the annular members is at least partially dehydrated to mate with another annular member.  
   
   
       14 . The implant of  claim 1 , wherein contacting surfaces of adjacent annular members are machined surfaces so that the contour of the contacting surfaces is about the same.  
   
   
       15 . The implant of  claim 14 , wherein the machined surfaces permit press-fitting of one sheath into another sheath.  
   
   
       16 . The implant of  claim 1 , wherein the annular member bones are selected from a femur, tibia, humerus, fibula, ulna, and radius.  
   
   
       17 . The implant of  claim 1 , wherein the annular members are noncircular.  
   
   
       18 . The implant of  claim 17 , wherein the annular members are generally oblong.  
   
   
       19 . The implant of  claim 1 , further comprising at least one supplemental annular member coupled to at least one of the annular members formed from bone, wherein the at least one supplemental annular member is formed of a material selected from metals, alloys, ceramics, polymers, and composites.  
   
   
       20 . The implant of  claim 1 , wherein at least one annular member further comprises alignment indicia.  
   
   
       21 - 24 . (canceled)