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Implantable fluid imbibing pump with improved closure

  • US 4,929,233 A
  • Filed: 08/26/1988
  • Issued: 05/29/1990
  • Est. Priority Date: 08/26/1988
  • Status: Expired due to Term
First Claim
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1. In an osmotically driven agent dispenser including an inner flexible bag adapted to contain the agent and having an open end, an intermediate layer of an osmotically effective solute composition at least partly encapsulating the bag, an outer shape-retaining membrane encapsulating the layer of osmotically effective solute composition, said membrane being at least in part permeable to water, and a port that extends from the interior of the bag to the exterior of the dispenser through which the agent may be charged into the bag and dispensed from the bag, the improvement comprising a locking snap-on closure for closing the open end of the bag, the closure having a biasing member for sealingly engaging the open end of the bag and a locking means preventing removal of the closure when the closure is in sealing engagement with the open end of the bag.

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