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Acrylic copolymer membranes for biosensors

  • US 5,284,140 A
  • Filed: 02/11/1992
  • Issued: 02/08/1994
  • Est. Priority Date: 02/11/1992
  • Status: Expired due to Term
First Claim
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1. In an implatable device for determining the level of an anlyte in a body, said device comprising a biosensor having sensor elements for evaluating the presence of the analyte and including a membrane enclosing the sensor elements, said membrane providing biocompatibility, protection of the sensor elements from the surrounding biological environment, and control of diffusion of materials to the sensor elements, the improvement comprising forming said membrane from an acrylic copolymer comprising first monomer units consisting of an acrylic ester having methoxy poly(ethylene oxide) methacrylate as part of the alcohol moiety, and second monomer units selected from methacrylates, acrylates and combinations thereof, said membrane absorbing water in an amount of about 10% to about 50% of the dry weight of said membrane.

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