Fluid pump
First Claim
1. Apparatus for the administration of solution at a precisely controlled rate, which comprises a length of flexible, collapsible tubing filled with said solution and connectable at one end to a conduit communicating with the vascular system of a patient, roller means for gripping and squeezing said tubing, means for rotating said roller means to advance the tubing therethrough, to expel said solution through said one end at a rate proportional to the rate of advancement of the tubing through the roller means, said means for rotating the roller means comprising a shaft carrying a roller of the roller means, an arm extending normally of said shaft and carried thereby to rotate said shaft and roller means as the arm is moved in one direction, clutch means to prevent back rotation of said shaft as the arm is moved in a direction opposite to the one direction, a motor, and cam means rotatable by said motor and positioned to engage said arm, to movingly reciprocate said arm back and forth in said one and opposite directions.
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Accused Products
Abstract
Apparatus for the administration of solution to a patient at a precisely controlled rate. A length of flexible, collapsible tubing filled with the solution and connectable at one end to a conduit communicating with the vascular system of a patient is advanced through roller means, so that the solution expelled from the tubing is proportional to the rate of advancement of the tubing through the roller means.
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Citations
34 Claims
- 1. Apparatus for the administration of solution at a precisely controlled rate, which comprises a length of flexible, collapsible tubing filled with said solution and connectable at one end to a conduit communicating with the vascular system of a patient, roller means for gripping and squeezing said tubing, means for rotating said roller means to advance the tubing therethrough, to expel said solution through said one end at a rate proportional to the rate of advancement of the tubing through the roller means, said means for rotating the roller means comprising a shaft carrying a roller of the roller means, an arm extending normally of said shaft and carried thereby to rotate said shaft and roller means as the arm is moved in one direction, clutch means to prevent back rotation of said shaft as the arm is moved in a direction opposite to the one direction, a motor, and cam means rotatable by said motor and positioned to engage said arm, to movingly reciprocate said arm back and forth in said one and opposite directions.
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10. Apparatus for the administration of solution to a patient at a precisely controlled rate, which comprises a length of flexible, collapsible tubing filled with said solution and connectable at one end to a conduit communicating with the vascular system of a patient, a pair of rotationally interengaged rollers for gripping and squeezing the tubing therebetween, means for rotating said rollers to advance the tubing therethrough, to expel said solution through said one end at a rate proportional to the rate of advancement of the tubing through the rollers, said means for rotating the rollers comprising a shaft carrying one of the rollers, an arm extending normally of the shaft and carried thereby to rotate said shaft and rollers as the arm is moved in one direction, transmission means to prevent back rotation of said shaft as the arm is moved in a direction opposite to the one direction, a motor, and cam means rotatable by said motor and positioned to engage said arm to movingly reciprocate said arm back and forth in said one and opposite directions, said cam means defining an outer bearing surface for engaging the arm, said outer bearing surface defining in transverse cross section a uniformly outwardly extending spiral surface essentially 360°
- about the cam means and an essentially radial step surface extending between the beginning and end of said spiral surface, whereby essentially continuous solution administration can be provided, and spring means provided to bias said arm against the cam means.
- View Dependent Claims (11, 12, 13, 14, 28, 29, 30)
- 15. Apparatus for the administration of solution to a patient at a precisely controlled rate, which comprises a length of flexible, collapsible tubing filled with said solution and connectable at one end to a conduit communicating with the vascular system of a patient, roller means for gripping and squeezing said tubing, means for rotating said roller means to advance the tubing therethrough, to expel said solution through said one end at a rate proportional to the rate of advancement of said tubing through the roller means, said means for rotating the roller means comprising interengaging gear and rack means, and intermittent power means for advancing and retracting said rack means to correspondingly rotate the gear means, and transmission means to prevent back rotation of said roller means as the arm is moved in one direction while permitting rotation of the roller means while the arm moves in the other direction.
- 22. Apparatus for the administration of solution to a patient at a precisely controlled rate, which comprises a length of flexible, collapsible tubing filled with solution and connectable at one end to a conduit communicating with the vascular system of a patient, roller means for gripping and squeezing said tubing, means for rotating said roller means to advance the tubing therethrough, to expel said solution through said one end at a rate proportional to the rate of advancement of the tubing through the roller means, a cassette having a first cylindrical chamber, said tubing being coiled inside of said first cylindrical chamber of said cassette, said tubing being placed back into a second cylindrical chamber of said cassette after passing through the roller means, said first and second cylindrical chambers being separated by a disc-shaped wall.
Specification