Implant coated with net-shaped or island-shaped low-crystallized hydroxyapatite and method for coating same

Abstract

The present disclosure relates to a method for coating a surface of a titanium implant with low crystalline hydroxyapatite having network- or island-like morphology and to an implant coated by such method.

1 . A titanium or titanium alloy implant coated with hydroxyapatite thin film having a double surface with co-exposure of a network- or island-like coating layer and the implant surface. 
     
     
         2 . The implant according to  claim 1 , wherein the hydroxyapatite has bioabsorbability. 
     
     
         3 . The implant according to  claim 1  wherein the thin film of hydroxyapatite has a thickness of 10 nm or less. 
     
     
         4 . A titanium or titanium alloy implant coated with hydroxyapatite in form of a thin film prepared by:
 pretreating a surface of a titanium or titanium alloy implant;   adding each of a phosphate ion solution and a calcium ion solution to the pretreated titanium or titanium alloy implant; and   dipping and storing the titanium or titanium alloy implant in the calcium phosphate solution for 1 hour or more.   
     
     
         5 . A coated implant comprising:
 a titanium or titanium alloy implant having a surface; and   a thin film coating of nonstoichiometric hydroxyapatite on at least a portion of the surface.   
     
     
         6 . The coated implant of  claim 5  wherein the nonstoichiometric hydroxyapatite is represented by: Ca 10-x (HPO 4 ) x (PO 4 ) 6-x (OH) 2-x .nH 2 O, wherein x=0 to 1, n=0 to 2. 
     
     
         7 . The coated implant of  claim 5  wherein the thin film coating is 10 nm or less. 
     
     
         8 . The coated implant of  claim 5  wherein the thin film coating has a network or island-like morphology.