Infusion pump with integrated permanent magnet
First Claim
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1. A device for pumping fluid from an upstream fluid source to a downstream patient, comprising:
- a tubing disposed between said fluid source and said patient;
a pumping element which uncompresses the tubing to draw fluid from the fluid source using a first predetermined force and compresses the tubing using a second predetermined force to pump fluid to the patient, wherein the motion of said pumping element changes in response to pressure changes in the tubing; and
a sensor configured to sense occlusions both upstream and downstream from said device by sensing changes in the position of said pumping element.
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Abstract
Described herein is an infusion pump with an integrated permanent magnet. The permanent magnet is positioned to provide an attractive force that moves an armature to compress a fluid-filled infusion tube. An electromagnet can be activated to overcome the attractive force of the permanent magnet and move the armature away from the infusion tubing. The force required to overcome the permanent magnet is much less than the force required to compress the tubing. For this reason the infusion pump has very low power consumption since much of the pumping work is provided by the permanent magnet.
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Citations
18 Claims
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1. A device for pumping fluid from an upstream fluid source to a downstream patient, comprising:
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a tubing disposed between said fluid source and said patient; a pumping element which uncompresses the tubing to draw fluid from the fluid source using a first predetermined force and compresses the tubing using a second predetermined force to pump fluid to the patient, wherein the motion of said pumping element changes in response to pressure changes in the tubing; and a sensor configured to sense occlusions both upstream and downstream from said device by sensing changes in the position of said pumping element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of pumping fluid with a pumping element from an upstream fluid source to a downstream patient, wherein a tubing is disposed between said fluid source and said patient, the method comprising:
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uncompressing said tubing with said pumping element using a first predetermined force to draw fluid from said fluid source; compressing said tubing with said pumping element using a second predetermined force to pump fluid to said patient; and sensing occlusions in said tubing by measuring the position of the pumping element in response to the first and second predetermined forces. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification