SYSTEM AND METHOD FOR DETECTING OCCLUSIONS IN AN INFUSION PUMP
First Claim
1. An ambulatory infusion system, comprising:
- a disposable infusion cartridge, the infusion cartridge including a collapsible reservoir for containing a fluid and a substantially rigid shell disposed over the collapsible reservoir and forming an interior volume between an outside surface of the collapsible reservoir and an inside surface of the shell;
a pump device configured to selectively receive the infusion cartridge and cooperate with the infusion cartridge to deliver fluid from the reservoir to the patient;
a pressure sensor located in one of the infusion cartridge and the pump, the pressure sensor in communication with the interior volume of the infusion cartridge; and
a processor located in one of the infusion cartridge and the pump, wherein the processor is adapted to;
obtain a first pressure reading of the pressure in the interior volume of the cartridge from the pressure sensor;
obtain a second pressure reading of the pressure in the interior volume of the cartridge from the pressure sensor following an operation configured to deliver fluid from the cartridge to a patient;
compare the first pressure reading to the second pressure reading; and
selectively generate an occlusion alarm based on the comparison of the first pressure reading to the second pressure reading.
5 Assignments
0 Petitions
Accused Products
Abstract
Occlusions in a delivery line of an infusion pump can be detected by measuring pressure differentials in the pump over short periods of time in order to minimize the effects of long term systematic sensor changes. In a delivery mode such as basal insulin delivery where a small portion of a volume of fluid is delivered, pressure readings can be obtained before and after the motor move to deliver each portion and compared. The differentials after one or more motor moves can be compared to determine whether an occlusion is present. In a delivery mode such as bolus insulin delivery in which an entire volume of fluid is delivered, pressure differentials can be obtained for consecutive deliveries at a common point in the delivery cycle of each delivery. Comparison of these pressure values can be used to determine whether an occlusion is present.
20 Citations
20 Claims
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1. An ambulatory infusion system, comprising:
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a disposable infusion cartridge, the infusion cartridge including a collapsible reservoir for containing a fluid and a substantially rigid shell disposed over the collapsible reservoir and forming an interior volume between an outside surface of the collapsible reservoir and an inside surface of the shell; a pump device configured to selectively receive the infusion cartridge and cooperate with the infusion cartridge to deliver fluid from the reservoir to the patient; a pressure sensor located in one of the infusion cartridge and the pump, the pressure sensor in communication with the interior volume of the infusion cartridge; and a processor located in one of the infusion cartridge and the pump, wherein the processor is adapted to; obtain a first pressure reading of the pressure in the interior volume of the cartridge from the pressure sensor; obtain a second pressure reading of the pressure in the interior volume of the cartridge from the pressure sensor following an operation configured to deliver fluid from the cartridge to a patient; compare the first pressure reading to the second pressure reading; and selectively generate an occlusion alarm based on the comparison of the first pressure reading to the second pressure reading. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An ambulatory infusion system, comprising:
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a disposable infusion cartridge, the infusion cartridge including a collapsible reservoir for containing a fluid and a substantially rigid shell disposed over the collapsible reservoir and forming an interior volume between an outside surface of the collapsible reservoir and in inside surface of the shell, the infusion cartridge further defining a collapsible volume for receiving fluid from the collapsible reservoir; a pump device including a motor and configured to selectively receive the infusion cartridge and cooperate with the infusion cartridge to deliver fluid from the reservoir into the collapsible volume and to the patient; a pressure sensor located in one of the infusion cartridge and the pump, the pressure sensor in communication with the interior volume of the infusion cartridge; and a processor located in one of the infusion cartridge and the pump, wherein the processor is adapted to; actuate the motor to deliver fluid contained in the collapsible volume to the patient; obtain a first pressure reading of the pressure in the interior volume of the cartridge from the pressure sensor prior to actuating the motor; cease actuation of the motor after delivering a desired amount of the fluid from the collapsible volume; obtain a second pressure reading after ceasing actuation of the motor; compare the first pressure reading to the second pressure reading; and generate an occlusion alarm if the second pressure reading is not the same as the first pressure reading. - View Dependent Claims (14, 15, 16, 17)
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18. An ambulatory infusion system, comprising:
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a disposable infusion cartridge, the infusion cartridge including; a collapsible reservoir for containing a fluid; a substantially rigid shell disposed over the collapsible reservoir and forming an interior volume between an outside surface of the collapsible reservoir and an inside surface of the shell; and a delivery mechanism having a spool slidingly disposed in a bore, the spool including a main section and a distal section axially displaceable relative to the main section with a collapsible volume formed between a seal on the main section and a seal on the distal section; a pump device configured to selectively receive the infusion cartridge, the pump device including a drive mechanism powered by a motor and selectively engageable with the spool to impart controlled axial movements of the spool to deliver fluid from the reservoir into the collapsible volume and to a patient; and a processor located in one of the infusion cartridge and the pump, wherein the processor is adapted to; actuate an operation to deliver fluid stored in the collapsible volume to the patient; determine whether the distal section of the spool moved axially at a time during the operation configured to deliver fluid from the reservoir to the patient when the distal section should have remained stationary; and generate an occlusion alarm if it is determined that the distal section moved at the time it should have remained stationary - View Dependent Claims (19, 20)
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Specification