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Fluid dispensing device

  • US 4,874,386 A
  • Filed: 05/15/1987
  • Issued: 10/17/1989
  • Est. Priority Date: 12/05/1986
  • Status: Expired due to Fees
First Claim
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1. An ambulatory fluid drug dispensing device comprising a reservoir for a liquid to be administered parenterally to a patient, means for introducing liquid in the reservoir, means for placing the liquid in the reservoir under constant pressure for dispensing the liquid from the device, said means for placing including a spring for applying a constant force to the liquid in the reservoir and means for tensioning said spring to initially apply the constant force on the liquid in the reservoir after the liquid has been introduced in the reservoir and flow control means for adjustably controlling the flow rate of the liquid dispensed from the device, said flow control means comprising means defining a elongated passage through which liquid from said reservoir can be flowed to an outlet of said device and means for changing the length of said elongated passage through which the liquid is flowed to thereby change the flow rate of the liquid through the passage.

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