Syringe pump rapid occlusion detection system
First Claim
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1. A method of automatically detecting an occlusion in a downstream fluid line of a medical pumping system, the downstream fluid line being configured to carry fluid under pressure between a fluid source and a patient, the method comprising:
- operating the medical pumping system to carry fluid under pressure in the downstream fluid line over a series of intervals having a first interval, a last interval, and a plurality of intervals therebetween;
determining, for each of the first interval, the last interval, and at least one of the plurality of intervals therebetween (“
middle interval”
), a relationship between an instantaneous pressure indicative of force in the downstream fluid line at an end of the interval and an instantaneous pressure indicative of force in the downstream fluid line at a beginning of the interval; and
providing an indication that an occlusion exists if (a) for each of the first interval, the last interval, and the middle interval the determined relationship departs from an expected relationship and (b) for at least a second one of the plurality of intervals (“
intermediate interval”
) either (i) said relationship is not determined or (ii) said relationship is determined, but said determined relationship of the intermediate interval does not depart from the expected relationship.
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Abstract
An apparatus and method for detecting an occlusion in a downstream fluid line of a medical pump in relation to increased pressure in the downstream fluid line between the beginning and the end of each interval of a series of intervals of operation of the pump even if one or more intervals between the first and last intervals does not reflect such an increase in pressure in the downstream fluid line.
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Citations
22 Claims
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1. A method of automatically detecting an occlusion in a downstream fluid line of a medical pumping system, the downstream fluid line being configured to carry fluid under pressure between a fluid source and a patient, the method comprising:
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operating the medical pumping system to carry fluid under pressure in the downstream fluid line over a series of intervals having a first interval, a last interval, and a plurality of intervals therebetween; determining, for each of the first interval, the last interval, and at least one of the plurality of intervals therebetween (“
middle interval”
), a relationship between an instantaneous pressure indicative of force in the downstream fluid line at an end of the interval and an instantaneous pressure indicative of force in the downstream fluid line at a beginning of the interval; andproviding an indication that an occlusion exists if (a) for each of the first interval, the last interval, and the middle interval the determined relationship departs from an expected relationship and (b) for at least a second one of the plurality of intervals (“
intermediate interval”
) either (i) said relationship is not determined or (ii) said relationship is determined, but said determined relationship of the intermediate interval does not depart from the expected relationship. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of automatically detecting an occlusion in a downstream fluid line of a medical pumping system, the downstream fluid line being configured to carry fluid under pressure between a fluid source and a patient, the method comprising:
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operating the medical pumping system to carry fluid under pressure in the downstream fluid line over a series of intervals having a first interval, a last interval, and at least one interval therebetween (“
intermediate interval”
);determining, for each of the first interval and the last interval, a relationship between an instantaneous pressure indicative of force in the downstream fluid line at an end of the interval and an instantaneous pressure indicative of force in the downstream fluid line at a beginning of the interval; and providing an indication that an occlusion exists if (a) for each the first interval and the last interval the determined relationship departs from an expected relationship and (b) for the intermediate interval either (i) said relationship is not determined or (ii) said relationship is determined, but said determined relationship of the intermediate interval does not depart from the expected relationship. - View Dependent Claims (8, 9, 10, 11)
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12. A medical pumping system for pumping fluid under pressure through a downstream fluid line configured to carry fluid under pressure between a fluid source and a patient, the system comprising:
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a pump configured to force fluid from a fluid source under pressure into a downstream fluid line; a sensor for determining force values indicative of force in said downstream fluid line; and a processor in communication with the pump, the processor being configured to execute program code that operates the pump to force fluid under pressure in said downstream fluid line over a series of intervals having a first interval, a last interval, and a plurality of intervals therebetween; wherein the processor is further configured to execute program code to; determine, for each of the first interval, the last interval, and at least one of the plurality of intervals therebetween (“
middle interval”
), a relationship between an instantaneous pressure indicative of force in said downstream fluid line at an end of the interval and an instantaneous pressure indicative of force in said downstream fluid line at a beginning of the interval; andprovide an indication that an occlusion exists if (a) for each of the first interval, the last interval, and the middle interval the determined relationship departs from an expected relationship and (b) for at least a second one of the plurality of intervals (“
intermediate interval”
) either (i) said relationship is not determined or (ii) said relationship is determined, but said determined relationship of the intermediate interval does not depart from the expected relationship. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A medical pumping system for pumping fluid under pressure through a downstream fluid line configured to carry fluid under pressure between a fluid source and a patient, the system comprising:
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a pump configured to force fluid from a fluid source under pressure into a downstream fluid line; a sensor for determining force values indicative of force in said downstream fluid line; a processor in communication with the pump, the processor being configured to execute program code that operates the pump to force fluid under pressure in said downstream fluid line over a series of intervals having a first interval, a last interval, and at least one interval therebetween (“
intermediate interval”
);wherein the processor is further configured to execute program code to; determine, for each of the first interval and the last interval, a relationship between an instantaneous pressure indicative of force in said downstream fluid line at an end of the interval and an instantaneous pressure indicative of force in said downstream fluid line at a beginning of the interval; and provide an indication that an occlusion exists if (a) for each of the first interval and the last interval the determined relationship departs from an expected relationship and (b) for the intermediate interval either (i) said relationship is not determined or (ii) said relationship is determined, but said determined relationship of the intermediate interval does not depart from the expected relationship. - View Dependent Claims (19, 20, 21, 22)
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Specification