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Medical devices using electrosensitive gels

  • US 6,287,294 B1
  • Filed: 04/06/2000
  • Issued: 09/11/2001
  • Est. Priority Date: 06/12/1996
  • Status: Expired due to Term
First Claim
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1. A self-propelled drug delivery device responsive to an applied voltage and having a drug delivery container comprising:

  • a. an aliquot of a drug;

    b. a closed, flexible sack surrounding said drug;

    c. a layer of expandable copolymer gel surrounding said flexible sack;

    d. a permeable membrane surrounding said layer of expandable copolymer gel;

    e. drug delivery electrode means operably coupled to said expandable copolymer gel to cause controllable contraction of said expandable copolymer gel when a voltage is applied to said electrode means; and

    a flexible propulsion container attached to said drug delivery container;

    said propulsion container including;

    f. a two-compartment container having a first and a second compartment separated by a septum;

    g. a flexible, inert filler in said first compartment;

    h. an expandable copolymer gel in said second compartment;

    i. a permeable membrane surrounding said expandable copolymer gel in said second compartment;

    j . propulsion electrode means operably coupled to said expandable copolymer gel in said second compartment to cause controllable contraction of said expandable copolymer gel in said response to a voltage applied to said electrode means, resulting in flexing of said container and motion of said container through a surrounding fluid medium.

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