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Failsafe apparatus and method for effecting syringe drive

  • US 4,908,017 A
  • Filed: 07/31/1987
  • Issued: 03/13/1990
  • Est. Priority Date: 05/14/1985
  • Status: Expired due to Fees
First Claim
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1. A compact device for controlling delivery of fluid from a syringe having a piston the movement of which in a predetermined direction causes said fluid to be expelled from said syringe, said device comprising:

  • a stepper motor having a rotatable motor shaft;

    pulse generating means including first and second state machines operating in parallel with respect to one another and connected in common with said stepper motor to provide pulses thereto, when said first and second state machines provide like outputs, for causing rotation of said motor shaft by increments, said first and second state machines including error monitoring means for monitoring said device to determine error in delivery of fluid from said syringe and precluding application of pulses to said stepper motor when said error is determined by said error monitoring means to thereby enhance safe delivery of fluid from said syringe; and

    motion translation means connected with said motor shaft and adapted to be connected with said piston for causing movement of said piston in said predetermined direction in response to said incremental rotation of said motor shaft.

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