Method of measuring an occlusion in an infusion device with disposable elements
First Claim
1. A method of detecting when an occlusion is present in an infusion apparatus having a delivery tube, and at least one actuator adjacent said delivery tube, said method comprising:
- contacting said delivery tube with a first portion of said actuator to squeeze closed a portion of said delivery tube;
contacting said delivery tube with a second portion of said actuator while said first portion of said actuator is closing said delivery tube;
measuring the force exerted between said second portion of said actuator and said tube to sense for an occlusion.
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Accused Products
Abstract
An infusion device with a disposable administration set which is inexpensive to manufacture. In the preferred embodiment of the present invention the disposable administration set has a plurality of elongated cam followers connected to a plate assembly, wherein the cam followers are displaced in a predetermined sequence and forced against a delivery tube by cam means driven by rotary drive means. The disposable administration set is injection molded as a single integral piece. The disposable administration set includes adjustment spacers disposed between the plate assembly and the cam followers which adjust the distance between them to keep the device accurate. In the preferred embodiment of the present invention the cam means are configured to provide fluid delivery at a consistent and uniform rate. The device may also incude a pressure sensing pin positioned on the cam assembly which contacts the tubing during the pumping cycle. The drive current is sampled and processed at predetermined phases during the cam rotation cycle to detect the presence of an occlusion in the tubing.
248 Citations
10 Claims
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1. A method of detecting when an occlusion is present in an infusion apparatus having a delivery tube, and at least one actuator adjacent said delivery tube, said method comprising:
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contacting said delivery tube with a first portion of said actuator to squeeze closed a portion of said delivery tube; contacting said delivery tube with a second portion of said actuator while said first portion of said actuator is closing said delivery tube; measuring the force exerted between said second portion of said actuator and said tube to sense for an occlusion. - View Dependent Claims (2, 3, 4, 5)
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6. A method of detecting when an occlusion is present in an infusion apparatus having plural followers, a delivery tube adjacent said followers, a rotatable cam shaft having an actuator adjacent each of said followers and a detection pin mounted on and rotatable with said rotatable cam shaft, said method comprising:
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rotating said cam shaft such that each of said actuators contacts a respective follower and said detection pin contacts said delivery tube; squeezing a portion of said delivery tube closed with at least one of said followers; contacting said delivery tube with said detection pin while said delivery tube is squeezed close; and determining a relative amount of force exerted between said detection pin and said delivery tube. - View Dependent Claims (7, 8, 9, 10)
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Specification