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Programmable valve pump

  • US 4,838,887 A
  • Filed: 12/15/1987
  • Issued: 06/13/1989
  • Est. Priority Date: 12/15/1987
  • Status: Expired due to Term
First Claim
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1. An implantable infusion apparatus comprising:

  • a housing containing,a rechargeable positive pressure infusate reservoir,an electronically controlled metering assembly receiving infusate from said reservoir, said metering assembly comprising a pair of normally closed valves and an accumulator positioned in fluid communication with each of said valves,electronic means for controlling the operation of said valves, andan outlet in fluid communication with said metering assembly to dispense infusate to a site in a living body, wherein when a first of said valves is open, infusate flows from said reservoir into said accumulator and when the other valve is open and the first closes, infusate flows from said accumulator into said outlet, said accumulator storing and discharging predetermined volume spikes of infusate at a frequency determined by the cycling rate of said pair of valves.

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