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Fluid infusion pumping apparatus

  • US 4,718,576 A
  • Filed: 12/23/1985
  • Issued: 01/12/1988
  • Est. Priority Date: 12/23/1985
  • Status: Expired due to Fees
First Claim
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1. In an infusion pumping apparatus having a motor for driving a pumping member to expel liquid, from a pumping chamber having an input from a single source of said liquid, at a rate as determined by a preset motor output rate, ramping control means for initiating the pumping of said liquid by operating the motor at a plurality of starting fractional rates for predetermined periods of time until the preset rate is obtained, each starting fractional rate being less than the preset rate and successive starting fractional rates increasing the motor rate, maintaining said preset rate for a selected period of time and means for stopping the motor after a predetermined quantity of said liquid has been delivered, said ramping control means also operating the motor at a plurality of stopping fractional rates for predetermined periods of time prior to the stopping of the motor, each stopping fractional rate being less than the preset rate and successive stopping fractional rates decreasing the motor speed.

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