Precoated polymeric prosthesis and process for making same
First Claim
1. An implant product for implantation into the body comprising:
- a prosthetic member having a shape configured to be implanted into a prepared area of the body, said prosthetic member defining a polymer surface adapted to be attached to an adjoining bone with a bone cement composition;
a coating covering said polymer surface of said prosthetic member, said coating being made from a bone cement compatible polymer comprising an activated mixture of UHMWPE and polymethyl methacrylate; and
an interfacial layer between said surface of said prosthetic member and said coating, said coating being bonded to said surface across said interfacial layer, said interfacial layer being made from a mixture of cross-linked polyethylene, virgin polyethylene, and polyethylene fibers.
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Abstract
The present invention is directed to a polymeric prosthesis precoated with a bone cement compatible polymer. The bone cement compatible polymer coating, is provided by an activated powder mixture of polymethyl methacrylate and ultra high molecular weight polyethylene which is bonded to the outer surface of the prosthesis by sintering. Once bonded to a polymeric prosthesis in accordance with the present invention, the precoat strengthens the interface between a bone cement and a prosthesis when the prosthesis is later implanted. The inner layer of the prosthesis may be provided of cross-linked UHMWPE powder sintered with virgin UHMWPE powder or fibers to provide a intermediate layer(s) of the coating present on the prosthesis. The precoat also decreases the likelihood that the prosthesis will loosen and break away from the cement over time. The polymeric implant product of the present invention is particularly well suited for use as an acetabular cup or a tibia plateau in replacing hip joints and knee joints respectively.
241 Citations
16 Claims
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1. An implant product for implantation into the body comprising:
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a prosthetic member having a shape configured to be implanted into a prepared area of the body, said prosthetic member defining a polymer surface adapted to be attached to an adjoining bone with a bone cement composition;
a coating covering said polymer surface of said prosthetic member, said coating being made from a bone cement compatible polymer comprising an activated mixture of UHMWPE and polymethyl methacrylate; and
an interfacial layer between said surface of said prosthetic member and said coating, said coating being bonded to said surface across said interfacial layer, said interfacial layer being made from a mixture of cross-linked polyethylene, virgin polyethylene, and polyethylene fibers. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of orthopedic implantation of a polymeric prosthesis with a bone cement composition comprising the steps of:
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providing a polymeric prosthesis to be implanted;
contacting said prosthesis with an activated powder mixture of UHMWPE and PMMA;
sintering said activated powder mixture to said prosthesis, thereby providing a precoated prosthesis;
preparing an area within a patient to receive the precoated polymeric prosthesis;
inserting a quantity of a bone cement composition into the prepared area;
immediately positioning said precoated polymeric prosthesis in the prepared area; and
permitting said bone cement composition to cure for bonding said precoated polymeric prosthesis with said prepared area. - View Dependent Claims (8, 9)
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10. A coating composition for a polymeric member comprising:
a sinterable mixture of an adhesive polymer and a structural polymer. - View Dependent Claims (11, 12, 13, 14, 15, 16)
Specification