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Variable rate syringe pump for insulin delivery

  • US 4,435,173 A
  • Filed: 03/05/1982
  • Issued: 03/06/1984
  • Est. Priority Date: 03/05/1982
  • Status: Expired due to Fees
First Claim
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1. A variable rate pump for insulin delivery comprising:

  • a piston pump having an output for connection for delivery of medication to a patient, said piston pump having a piston therein;

    electrical motor drive means connected to said piston to move said piston in said pump to dispense medication from said pump, said electric motor means comprising a pulse-driven electric motor having an output shaft, said output shaft being connected to a lead screw, a nut on said lead screw to move axially of said lead screw when said lead screw rotates, said nut being in engagement with said plunger to move said plunger as said motor rotates, a wheel connected to rotate with said lead screw, a plurality of magnetic poles on said wheel, said motor drive means including a pulse switch, said pulse switch being a magnetically controlled switch mounted directly adjacent said wheel and controlled by said wheel to produce signal pulses as said motor moves said plunger;

    control means for controlling said motor, said control means having pulse interval selection means for producing a base command pulse rate which is proportional to the desired medication dispensing command rate, said pulse switch being connected to said motor control means so that the pulses produced as said motor moves said piston are counted by said control means and are compared to the command pulses delivered for controlling said motor, said base rate selection means being manually selectable, said control means also including a bolus control means connected to deliver a preselected number of bolus command pulses to said motor drive means for the delivery of a preselected amount of medication.

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