Patient-side occlusion detection system for a medication infusion system
First Claim
1. A patient-side occlusion detection system for use in a medication infusion system having a disposable cassette including a pump mounted onto a main pump unit, comprising:
- means for providing an electrical patient-side pressure signal indicative of patient-side fluid pressure;
a differentiator for taking the first difference of said patient-side pressure signal to produce a pressure change rate signal;
a one-step ahead predictor having as inputs said patient-side pressure signal and said pressure change rate signal, said one-step ahead predictor having as an output a predicted future pressure signal;
first means for monitoring said one-step ahead predictor whenever said pressure change rate signal equals or exceeds a first preselected value, said first monitoring means initiating an alarm when said predicted future pressure signal exceeds a second preselected value; and
second means for monitoring said patient-side pressure signal whenever said pressure change rate signal is less than said first preselected value, said second monitoring means initiating an alarm when said patient-side pressure signal exceeds a third preselected value.
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Abstract
A system for detecting an occlusion in a fluid line is disclosed which can detect occlusions in the downstream or patient side of a disposable cassette containing a fluid pump thereon. The cassette includes a pressure diaphragm and is for installation onto and use with a main pump unit including a pressure transducer therein for monitoring fluid pressure downstream of the pump. The system utilizes control circuitry to provide an alarm in the event of a patient-side occlusion, and the occlusion detection system works when the system is configured as any of a number of difference device types, including both a flow controller emulation and several different infusion pump configurations.
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Citations
22 Claims
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1. A patient-side occlusion detection system for use in a medication infusion system having a disposable cassette including a pump mounted onto a main pump unit, comprising:
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means for providing an electrical patient-side pressure signal indicative of patient-side fluid pressure; a differentiator for taking the first difference of said patient-side pressure signal to produce a pressure change rate signal; a one-step ahead predictor having as inputs said patient-side pressure signal and said pressure change rate signal, said one-step ahead predictor having as an output a predicted future pressure signal; first means for monitoring said one-step ahead predictor whenever said pressure change rate signal equals or exceeds a first preselected value, said first monitoring means initiating an alarm when said predicted future pressure signal exceeds a second preselected value; and second means for monitoring said patient-side pressure signal whenever said pressure change rate signal is less than said first preselected value, said second monitoring means initiating an alarm when said patient-side pressure signal exceeds a third preselected value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A patient-side occlusion detection system for use in a medication infusion system having a disposable cassette mounted onto a main pump unit, comprising:
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means for providing an analog electrical pressure signal indicative of patient-side fluid pressure; an analog-to-digital converter for converting said analog pressure signal into a digital pressure signal; a differentiator for taking the first difference of said digital pressure signal to produce a digital pressure change rate signal having a sampling period T; a one-step ahead predictor having as inputs said digital pressure signal and said digital pressure change rate signal, said one-step ahead predictor having as an output a predicted pressure signal for one sampling period T in the future; first means for monitoring said one-step ahead predictor whenever said digital pressure change rate signal equals or exceeds a first preselected value, said first monitoring means initiating an alarm when said predicted pressure signal exceeds a second preselected value; and second means for monitoring said digital pressure signal whenever said digital pressure change rate signal is less than said first preselected value, said second monitoring means initiating an alarm when said digital pressure signal exceeds a third preselected value.
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21. A patient-side occlusion detection system for use in a medication infusion system having a disposable cassette mounted onto a main pump unit, comprising:
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means for providing a digital electrical pressure signal indicative of patient-side fluid pressure; means for taking the first difference of said digital pressure signal to produce a digital pressure change rate signal having a sampling period T; a one-step ahead predictor having as inputs said digital pressure signal and said digital pressure change rate signal, said one-step ahead predictor having as an output a predicted pressure signal for one sampling period T in the future; first means for monitoring said one-step ahead predictor whenever said digital pressure change rate signal equals or exceeds a first preselected value, said first monitoring means initiating an alarm when said predicted pressure signal exceeds a second preselected value; and second means for monitoring said digital pressure signal whenever said digital pressure change rate signal is less than said first preselected value, said second monitoring means calculating a baseline pressure shortly after infusion is begun, said second monitoring means initiating an alarm when said digital pressure signal exceeds the sum of said baseline pressure plus a third preselected value.
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22. A method of detecting a patient-side occlusion in a medication infusion system having a disposable cassette mounted onto a main pump unit, comprising:
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providing an electrical patient-side pressure signal indicative of patient-side fluid pressure; taking the first difference of said patient-side pressure signal to produce a pressure change rate signal having a sampling period T; using a one-step ahead predictor to calculate a predicted pressure signal for one sampling period T in the future, said one-step ahead predictor having as inputs said patient-side pressure signal and said pressure change rate signal; monitoring said one-step ahead predictor whenever said pressure change rate signal equals or exceeds a first preselected value, said first monitoring means initiating an alarm when said predicted pressure signal exceeds a second preselected value; and monitoring said patient-side pressure signal whenever said pressure change rate signal is less than said first preselected value, said second monitoring means initiating an alarm when said patient-side pressure signal exceeds a third preselected value.
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Specification