Container-side occlusion detection system for a medication infusion system
First Claim
1. A container-side occlusion detection system for use in a medication infusion system having a disposable cassette mounted onto a main pump unit, comprising:
- a reciprocating piston pump located in a disposable cassette, said pump having a fill stroke and a deliver stroke;
a motor location in a main pump unit, said motor for driving said pump;
means for monitoring motor current during said fill stroke of said pump, said motor current being indicative of the presence or absence of a container-side occlusion in a fluid line, said monitoring means comprising an integrator for taking the first integral of motor current and providing as an output a CSOD value characteristic of said motor current;
means for providing an alarm; and
means for comparing said CSOD value to a preselected alarm threshold value, said comparing means causing said means for providing an alarm to initiate an alarm when said CSOD value exceeds said preselected alarm threshold value.
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Accused Products
Abstract
A system for detecting an occlusion in a fluid line is disclosed which can detect occlusions in the upstream or container side of a disposable cassette containing a fluid pump therein. The cassette includes a piston-type pump with inlet and outlet valves, and is for installation onto and use with a main pump unit including motors for driving the pump and valves contained in each cassette. The system utilizes control circuitry to monitor the intake stroke of the pump in the cassette, to detect an upstream occlusion in the fluid line leading to the pump, and to provide an alarm in the event of a container-side occlusion.
203 Citations
23 Claims
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1. A container-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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a reciprocating piston pump located in a disposable cassette, said pump having a fill stroke and a deliver stroke; a motor location in a main pump unit, said motor for driving said pump; means for monitoring motor current during said fill stroke of said pump, said motor current being indicative of the presence or absence of a container-side occlusion in a fluid line, said monitoring means comprising an integrator for taking the first integral of motor current and providing as an output a CSOD value characteristic of said motor current; means for providing an alarm; and means for comparing said CSOD value to a preselected alarm threshold value, said comparing means causing said means for providing an alarm to initiate an alarm when said CSOD value exceeds said preselected alarm threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A container-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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a reciprocating piston pump located in a disposable cassette, said pump having a fill stroke and a deliver stroke; a motor located in a main pump unit, said motor for driving said pump; means for monitoring motor current during said fill stroke of said pump, motor current being indicative of the presence or absence of a container-side occlusion in a fluid line, said monitoring means providing as an output a CSOD value characteristic of said motor current; an integrator for taking the first integral of motor current to produce said CSOD value; means for providing an alarm; and means for comparing the output of said integrator to a preselected alarm threshold value, said comparing means causing said means for providing an alarm to initiate an alarm when said CSOD value exceeds said preselected alarm threshold value.
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22. A container-side occlusion detection system for use in a medication infusion system comprising a disposable cassette including a reciprocating piston pump mounted onto a main pump unit including a motor for driving the pump, said container-side occlusion detection system comprising:
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means for monitoring motor current during a fill stroke of said pump, said motor current being indicative of the present or absence of a container-side occlusion in a fluid line, said monitoring means comprising an integrator for taking the first integral of motor current and providing as an output a CSOD value characteristic of said motor current; means for providing an alarm; and means for comparing said CSOD value to a preselected alarm threshold value, said comparing means causing said means for providing an alarm to initiate an alarm when said CSOD value exceeds said preselected alarm threshold value.
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23. A method of detecting a container-side occlusion in a medication infusion system having a disposable cassette mounted onto a main pump unit, comprising:
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providing a reciprocating piston pump in said disposable cassette, said pump having a fill stroke and a deliver stroke; driving said pump with a motor located in said main pump unit; monitoring motor current during said fill stroke of said pump, said motor current being indicative of the presence or absence of a container-side occlusion in a fluid line, said monitoring means comprising an integrator for taking the first integral of motor current and providing as an output a CSOD value characteristic of said motor current; and comparing said CSOD value to a preselected alarm threshold value, said comparing means initiating an alarm when said CSOD value exceeds said preselected alarm threshold value.
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Specification