Vertebral body spacer

Abstract

A vertebral body spacer of the present invention is used by being inserted between a vertebral body and a vertebral body (intervertebral space). The vertebral body spacer has a block body constituted of titanium or a titanium alloy as a main component thereof, and provided with a pair of contact surfaces to be made contact with the vertebral body and the vertebral body. The block body includes needle parts formed into a needle shape having both end portions and a porous part having through holes passing through the porous part in a thickness direction thereof, and a porosity of at least a surface of the porous part is larger than a porosity of each of the needle parts. The needle parts are inserted into the through holes so that the both end portions are projected from the contact surfaces.

What is claimed is: 
     
         1 - 9 . (canceled) 
     
     
         10 . A vertebral body spacer configured for insertion between two vertebral bodies, the vertebral body spacer comprising:
 at least one block body including a porous part and a pair of contact surfaces on opposite sides thereof configured to contact the vertebral bodies, the block body defining a hole from one of the pair of contact surfaces to the other of the pair of contact surfaces; and   a needle part having a first end and a second end configured for fixing the block body between the vertebral bodies, the needle part extending between the contact surfaces through the hole with the first end projecting outward from one of the pair of contact surfaces and the second end projecting outward from the other of the pair of contact surfaces.   
     
     
         11 . The vertebral body spacer as claimed in  claim 10 , wherein each of the contact surfaces is substantially planar. 
     
     
         12 . The vertebral body spacer as claimed in  claim 10 , wherein the needle part extending through the hole is substantially perpendicular to the contact surfaces. 
     
     
         13 . The vertebral body spacer as claimed in  claim 10 , wherein the first and second ends of the needle part extend substantially perpendicular to the contact surfaces in opposite directions. 
     
     
         14 . A vertebral body spacer configured for insertion between two vertebral bodies, the vertebral body spacer comprising:
 at least one block body including a porous part and a pair of contact surfaces configured to contact the vertebral bodies, the block body defining a plurality of holes from one of the pair of contact surfaces to the other of the pair of contact surfaces; and   a plurality of needle parts extending through the plurality of holes, each needle part having a first end and a second end configured for fixing the block body between the vertebral bodies, the first end projecting outward from one of the pair of contact surfaces and the second end projecting outward from the other of the pair of contact surfaces,   wherein the plurality of needle parts extend in substantially the same direction.   
     
     
         15 . The vertebral body spacer as claimed in  claim 14 , wherein the porous part has a thickness, and the plurality of needle parts extend in a thickness direction of the porous part. 
     
     
         16 . The vertebral body spacer as claimed in  claim 14 , wherein the pair of contact surfaces are planar and configured to face the vertebral bodies. 
     
     
         17 . The vertebral body spacer as claimed in  claim 14 , wherein the contact surfaces are substantially perpendicular to the plurality of needle parts.