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Infusion pump

  • US 4,744,786 A
  • Filed: 06/17/1986
  • Issued: 05/17/1988
  • Est. Priority Date: 06/17/1986
  • Status: Expired due to Term
First Claim
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1. An infusion pump for delivering liquid to a body at an adjustably controlled rate of delivery, said pump comprising a syringe section including a syringe barrel having a nozzle at one end and an inner end of a syringe piston in said syringe barrel with an outer end of said syringe piston extending out of the other end of said barrel,a drive mechanism comprising a generally cylindrical housing having one end mounted to the other end of said syringe barrel, said outer end of said piston extending into said one end of said housing,a gas spring at the other end of said housing,dampening/timing means positioned between said gas spring and said outer end of said syringe piston, said dampening/timing means including a viscous fluid which is movable through a passageway in said housing from a space adjacent said gas spring to a space above said piston, andadjustment means for adjusting the flow rate of the viscous fluid through said passageway and between said spaces.

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