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Apparatus and method for delivering a biologically active compound into a biological environment

  • US 5,651,979 A
  • Filed: 06/07/1995
  • Issued: 07/29/1997
  • Est. Priority Date: 03/30/1995
  • Status: Expired due to Fees
First Claim
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1. Apparatus for controlled delivery of a biologically active compound to a biological environment comprising:

  • first and second compartments separated by a moveable partition;

    the first compartment including a screen or membrane forming at least a portion of a side of the first compartment, the first compartment containing a polymer gel network which undergoes a volume change in response to an environmental condition which varies in the biological environment;

    the second compartment containing an effective amount of the biologically active compound and including an orifice communicating with the biological environment;

    whereupon volume change of the polymer gel network moves the partition and causes the biologically active compound to be discharged into the biological environment through the orifice.

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