Method and system for upstream occlusion detection
First Claim
1. A method for detecting an occlusion in a fluid line upstream of a pump adapted to cause fluid to flow from an upstream portion to a downstream portion of said fluid line, said pump having a duty cycle including a transition period in which fluid pressure is communicated from said upstream portion to said downstream portion of said fluid line, the steps of said method comprising:
- monitoring fluid pressure in said fluid line downstream of said pump during said transition period to detect the occurrence of a negative-going pressure waveform;
determining the power content of said detected negative-going pressure waveform over a range of frequencies;
comparing said power content with a predetermined power threshold; and
generating an occlusion signal when said waveform power content exceeds said predetermined power threshold.
13 Assignments
0 Petitions
Accused Products
Abstract
The method and system for detecting occlusion in a fluid line upstream of a pump concerns a fluid pump with a pump cycle in which the upstream pressure of the fluid line is communicated to the downstream portion of the fluid line. A pressure sensor located downstream of the pump is capable of measuring a relatively large negative-going pressure in the fluid line. A signal is generated to indicate occlusion based upon detection of negative-going pressure.
271 Citations
34 Claims
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1. A method for detecting an occlusion in a fluid line upstream of a pump adapted to cause fluid to flow from an upstream portion to a downstream portion of said fluid line, said pump having a duty cycle including a transition period in which fluid pressure is communicated from said upstream portion to said downstream portion of said fluid line, the steps of said method comprising:
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monitoring fluid pressure in said fluid line downstream of said pump during said transition period to detect the occurrence of a negative-going pressure waveform; determining the power content of said detected negative-going pressure waveform over a range of frequencies;
comparing said power content with a predetermined power threshold; andgenerating an occlusion signal when said waveform power content exceeds said predetermined power threshold. - View Dependent Claims (2, 3, 4)
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5. A method for detecting an occlusion in a fluid line upstream of a pump adapted to cause fluid to flow from an upstream portion to a downstream portion of said fluid line, said pump having a cycle with a period during which fluid pressure is communicated from said upstream portion to said downstream portion of said fluid line, the steps of said method comprising:
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monitoring fluid pressure in said fluid line downstream of said pump during the period of said pump cycle during which fluid pressure is communicated from said upstream portion to said downstream portion to detect the occurrence of negative-going pressure in said fluid line; and generating a signal indicating an occlusion when negative-going pressure is detected. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for detecting an occlusion in a portion of a fluid line upstream of a pump, the pump being adapted to cause fluid to flow from the upstream portion to a downstream portion of said fluid line, said pump having a cycle with a period during which fluid pressure is communicated from said upstream to said downstream portion of said fluid line, the system comprising:
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means for monitoring fluid pressure in said fluid line downstream of said pump during the period of said pump cycle during which fluid is communicated from said upstream portion to said downstream portion to detect the occurrence of negative-going pressure in said fluid line; and means for generating a signal indicating an occlusion in said upstream portion of the fluid line when negative-going pressure is detected by said means for monitoring. - View Dependent Claims (22, 23, 24, 25, 26)
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27. In an intravenous fluid administration system including a fluid line, and a pump adapted to cause fluid to flow from an upstream portion to a downstream portion of said fluid line, said pump having a duty cycle with a cyclical flow transition period during which fluid pressure is communicated downstream to induce a negative pressure transient downstream of said pump when an occlusion exists in said fluid line upstream of said pump, an upstream occlusion detection system comprising the combination of:
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a pressure detector for measuring fluid pressure in said fluid line at a location downstream of said pump; means for monitoring said fluid pressure in said fluid line downstream of said pump during said flow transition period to detect the occurrence of each negative pressure transient; and means for generating an occlusion signal indicating an occlusion condition upstream of said pump when a said negative pressure transient is detected. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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34. In a system for detecting an occlusion in a fluid line upstream of a pump wherein the pump operates on said fluid line to cause fluid to flow from an upstream portion to a downstream portion of said fluid line, said pump having a cycle with a non-flow transition period during which fluid pressure is communicated from said upstream portion to said downstream portion of said fluid line, the combination comprising:
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means for monitoring fluid pressure in said fluid line downstream of said pump during said non-flow transition period to detect the occurrence of a negative-going pressure transient; and means for determining power content over a range of frequencies of each said negative-going pressure transient detected by said means for monitoring, comparing said power content with a power threshold, and generating an occlusion signal when said power content exceeds said power threshold.
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Specification