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Medical devices using electrosensitive gels

  • US 5,800,421 A
  • Filed: 06/12/1996
  • Issued: 09/01/1998
  • Est. Priority Date: 06/12/1996
  • Status: Expired due to Term
First Claim
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1. A drug delivery device comprising an aliquot of a drug;

  • a closed, flexible sack surrounding said drug;

    a layer of expandable copolymer gel surrounding said flexible sack;

    a permeable membrane surrounding said layer of expandable copolymer gel; and

    electrode means operably coupled to said expandable copolymer gel to cause controllable contraction of said expandable copolymer gel in response to a voltage applied to said electrode means.

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