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Peristaltic pump

a pump and peristaltic technology, applied in the direction of pump control, positive displacement liquid engine, machine/engine, etc., can solve the problems of increasing the cost and complexity of the pumping mechanism, affecting the performance of the pump, and reducing so as to reduce the pulsation rate of the pump

Inactive Publication Date: 2007-09-20
ALCON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] Another objective of the present invention is to provide a peristaltic pump that reduces pump pulsations.

Problems solved by technology

Increasing the number of rollers and / or the use of variable radius pumps increases the cost and complexity of the pumping mechanism.
Compliance or capacitance chamber negatively affect the performance (such as vacuum rise time) of the pump.

Method used

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  • Peristaltic pump
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Examples

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Embodiment Construction

[0015] As best seen in FIG. 2, in one embodiment of the present invention, pump 10 of the present invention generally includes pump motor 12, roller head 14, containing one or more rollers 16. Pump 10 is used in combination with cassette 18 having elastomeric sheet 20 applied to the exterior of relatively rigid body or substrate 22. Pump motor 12 preferably is a stepper or D.C. servo motor. Roller head 14 is attached to shaft 24 of motor 12 so that motor 12 rotates roller head 14 in a plane generally normal to the axis of shaft 24, and the longitudinal axes of rollers 16 are generally radial to the axis of shaft 24. Shaft 24 may contain shaft position encoder 25.

[0016] With respect to cassette 18, sheet 20 contains molded fluid channel 26 that is generally planar, arcuate in shape (within the plane) and having a radius approximating that of rollers 16 about shaft 24. Sheet 20 may be made of any suitably flexible, easily molded material such as silicone rubber or thermoplastic elast...

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PUM

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Abstract

A peristaltic pump having an adaptive pulsation profile.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates generally to peristaltic pumps and more specifically to peristaltic pumps used in ophthalmic surgical equipment. [0002] Peristaltic pumps work by compressing or squeezing a length of flexible tubing (sometimes between a fixed race) using a rotating roller head. As the roller head rotates, the rollers stretch and pinch off a portion of the tubing and push any fluid trapped in the tubing between the roller in the direction of rotation. Peristaltic pumps are widely used in medical applications because of their predictable flow properties. [0003] Many factors influence the efficiency of peristaltic pumps, for example, pump motor torque, pump speed and pump tube flexibility. The efficiency of a peristaltic pump is also dependent on how tightly the pump rollers crush the tubing against the pump race. If the tubing is not collapsed completely by the rollers, not all of the fluid will be pushed further down the tube. One chara...

Claims

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Application Information

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IPC IPC(8): F04B49/06
CPCF04B43/12F04B43/1238F04B49/20F04B43/1269F04B43/1253
Inventor GORDON, RAPHAELLEUKANECH, KURT D.MORGAN, MICHAEL D.SORENSEN, GARY P.
Owner ALCON INC