Medical device and surface modification method for medical device

Abstract

The invention provides a medical device in which a metallic porous body is joined to at least a part of a surface of the main body of a medical device, and a surface modification method for the medical device. The metallic porous body is formed in multilayers.

1 . A medical device comprising:
 a main body that is an artificial prosthetic member;   a metallic porous thin plate deformed to follow at least a part of a surface shape of the main body and joined thereto, wherein,   the metallic porous thin plate is prepared by: molding a slurry containing a metal powder, a foaming agent, a water-soluble resin binder, and water into a sheet shape; subjecting the slurry to a foaming process; drying the slurry; and defatting and sintering the resulting compact,   an average grain diameter of the metal powder is in the range of 0.5 to 50 μm,   a content of the metal powder in the slurry is in the range of 30 to 80 mass %,   an average pore diameter of the metallic porous thin plate is in the range of 20 to 800 μm,   the metallic porous thin plate has a three-dimensional net-like cell structure, in which a skeleton of the metallic porous thin plate is formed from the metal powder, and   a surface shape of a rear surface between the metallic porous thin plate and the main body is asymmetric with respect to a surface shape of a front surface between the metallic porous thin plate and the living tissue, three-dimensionally swollen foamed pores and flatly formed pores being formed on the front surface and rear surface, respectively.   
     
     
         2 - 7 . (canceled) 
     
     
         8 . The medical device according to  claim 1 ,
 wherein the main body is made of a metal including any one of: stainless steel, a cobalt chrome alloy, tantalum, and a titanium alloy; or ceramics.   
     
     
         9 - 23 . (canceled) 
     
     
         24 . The medical device according to  claim 1 , wherein a specific surface area of the metallic porous thin plate is in the range of 0.01 to 0.5 m 2 /g. 
     
     
         25 . The medical device according to  claim 8 , wherein a specific surface area of the metallic porous thin plate is in the range of 0.01 to 0.5 m 2 /g. 
     
     
         26 . The medical device according to  claim 1 , wherein a porosity of the metallic porous thin plate is in the range of 40 to 97%. 
     
     
         27 . The medical device according to  claim 8 , wherein a porosity of the metallic porous thin plate is in the range of 40 to 97%. 
     
     
         28 . The medical device according to  claim 24 , wherein a porosity of the metallic porous thin plate is in the range of 40 to 97%.