Process for the protection of metallic surfaces

• US 5,562,944 A
• Filed: 08/28/1995
• Issued: 10/08/1996
• Est. Priority Date: 08/28/1995
• Status: Expired due to Term

• Current Assignee: Johnson & Johnson Professional Company Incorporated (Johnson & Johnson)
• Original Assignee: Johnson & Johnson Professional Company Incorporated (Johnson & Johnson)
• Inventors: Kafrawy, Adel
• Primary Examiner(s): DUDASH, DIANA L
• Application Number:
  US08/520,193
• Time in Patent Office: 407 Days
• Field of Search: 427/2.24, 427/2.26, 427/156
• US Class Current: 427/156
• CPC Class Codes: A61L 27/06 Titanium or titanium alloys
• CPC Class Codes: A61L 27/34 Macromolecular materials
• CPC Class Codes: B05D 5/00 Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
• CPC Class Codes: B05D 7/14 to metal, e.g. car bodies involving a chemical reaction between the metal and the coating C23
• CPC Class Codes: C08L 89/00 Compositions of proteins; Compositions of derivatives thereof foodstuff preparations A23J3/00

Abstract

A method for the protection of porous metallic surfaces, such as titanium tibial tray components, titanium hip stems, and cobalt chrome cup shells of various sizes, during machining, sandblasting, and inspection of orthopaedic implants is disclosed. The process includes the application, cross-linking, and removal of a liquid gelatin coating which provides excellent protection against dirt, dust, lint and other materials from entering the porous surfaces of the prosthetic devices during manufacturing.

Claims

1. A method of protecting a surface of an implantable metal prosthesis during the manufacturing process comprising;

a) applying a liquid gelatin to the surfaces of the prosthesis to be protected,

b) cross-linking the gelatin to form a hard protective coating on the surfaces

c) further mechanically processing the prosthesis,

d) contacting the coating with an aqueous solution of a base to remove the protective coating from the prosthesis.

2. The method of claim 1 in which the gelatin is derived from cod fish skins.

3. The process of claim 2 in which the gelatin is cross-linked by contacting the gelatin on the surface of the prosthesis with a solution of chrome alum at a temperature of between 70°

and 90°

C. for a period of between 10 and 20 seconds.

4. The process of claim 1 in which the base is a mixture of sodium hydroxide and potassium hydroxide.