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IV pump

  • US 3,985,133 A
  • Filed: 05/28/1974
  • Issued: 10/12/1976
  • Est. Priority Date: 05/28/1974
  • Status: Expired due to Term
First Claim
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1. A volumetric pump for pumping between a patient and a source a volume of fluid at a preselected controlled rate until a preselected volume of fluid has been pumped, includingan output line,volumetric means for receiving the volume of fluid from the source and providing the fluid to the output line,the volumetric means including a chamber of a predetermined volume per increment of displacement which predetermined volume is a fraction of the volume of fluid from the source and a fraction of the fluid to be pumped to the output line,a plunger movable within the chamber on an incremental basis in a first direction for filling the chamber and movable within the chamber, in a second direction opposite to the first direction, on an incremental basis for emptying the chamber,plunger means coupled to the plunger for driving the plunger on the incremental basis in the first direction to fill the chamber and for driving the plunger on an incremental basis in the second direction to empty the chamber,a stepper motor constructed to operate in increments each representative of a particular distance,control means, including the stepper motor, operatively coupled to the plunger driving means to obtain an incremental operation of the plunger driving means for driving the plunger on the incremental basis in the first direction and to obtain an incremental operation of the plunger driving means for driving the plunger on an incremental basis in the second direction,means for providing an indication representing the preselected amount of fluid to be supplied between the patient and the source,means responsive to the incremental operation of the plunger driver means in driving the plunger on an incremental basis in the second direction for counting the number of such incremental operations to obtain a determination of the amount of fluid transferred between the source and the patient, andmeans responsive to the count of the incremental operations representing the determination of the amount of fluid transferred between the patient and the source for interrupting the supply of the fluid between the patient and the source when the amount of such fluid corresponds to a preselected incremental count.

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