Method for depositing bioactive coatings on conductive substrates
AssigneeQueen's University at Kingston
InventorMorteza Shirkanzadeh
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Abstract
A process for electro depositing bioactive coatings, such as calcium phosphate or aluminum oxide, onto conductive substrates, such as prosthetic implant devices, is described. An electrolyte bath containing an aqueous solution of the desired oxide or phosphate is prepared with an inert anode such as a platinum anode. A porous or non porous substrate, such as a stainless steel or titanium implant is used as the cathode and a D.C. potential is applied so as to raise the interfacial pH at the cathode sufficient to precipitate the desired oxide or phosphate thereon as a dense adherent film.
Claims14
A process for electodepositing an adherent ceramic phosphate coating on a conducting substrate comprising:
- (a) providing an electrolytic cell having an inert anode and containing an electrolyte comprising an aqueous solution containing ions of said ceramic and having a pH of less than 8;
- (b) activating said conducting substrate;
- (c) immersing said conducting substrate in said electrolyte;
- (d) applying a DC potential between said anode and said activated conducting substrate so as to raise the pH of said electrolyte at an interface between said electrolyte and said activated conducting substrate sufficient to precipitate said ceramic from said electrolyte and onto said activated conducting substrate.
A process as claimed in claim 3 when said phosphate coating is selected from the group consisting of .alpha. and .beta. tricalcium phosphate and components having a formula Ca.sub.5 (PO.sub.4).sub.3-x (CO.sub.3).sub.x (OH).sub.1+x where x is 0.2 or less.
Dependencies are inferred from the claim text.