Detection of infusion pump conditions
First Claim
1. An ambulatory infusion system, comprising:
- an 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 programmed with an algorithm to perform the following;
actuating the pressure sensor to take pressure measurements at regular time intervals;
periodically assessing a preselected number of the pressure measurements with statistical analysis to identify statistical measures associated with the pressure measurements including determining a standard deviation for the preselected number of the pressure measurements;
using the standard deviation to assess the status of the flexible reservoir and the pump device including identifying occasions wherein the standard deviation varies substantially from an expected standard deviation; and
associating the occasions wherein the standard deviation varies substantially from an expected standard deviation with the flexible reservoir being filled to or near its maximum level or capacity.
5 Assignments
0 Petitions
Accused Products
Abstract
An ambulatory infusion system and a method of operating including a disposable infusion cartridge having a collapsible reservoir and a substantially rigid shell disposed over the collapsible reservoir having an interior volume, a pump device, a pressure sensor in communication with the interior volume and a processor. The method includes actuating the pressure sensor to take pressure measurements at regular time intervals; periodically assessing a preselected number of the pressure measurements with statistical analysis to identify statistical measures associated with the pressure measurements; and using the statistical measures to assess the status of the flexible reservoir and the pump device.
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Citations
7 Claims
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1. An ambulatory infusion system, comprising:
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an 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 programmed with an algorithm to perform the following; actuating the pressure sensor to take pressure measurements at regular time intervals; periodically assessing a preselected number of the pressure measurements with statistical analysis to identify statistical measures associated with the pressure measurements including determining a standard deviation for the preselected number of the pressure measurements; using the standard deviation to assess the status of the flexible reservoir and the pump device including identifying occasions wherein the standard deviation varies substantially from an expected standard deviation; and associating the occasions wherein the standard deviation varies substantially from an expected standard deviation with the flexible reservoir being filled to or near its maximum level or capacity. - View Dependent Claims (2, 3, 4)
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5. An ambulatory infusion system, comprising:
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an 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 programmed with an algorithm to perform the following; actuating the pressure sensor to take pressure measurements at regular time intervals; periodically assessing a preselected number of the pressure measurements with statistical analysis to identify statistical measures associated with the pressure measurements including determining a standard deviation for the preselected number of the pressure measurements; using the standard deviation to assess the status of the flexible reservoir and the pump device including identifying occasions wherein the standard deviation varies substantially from an expected standard deviation; and associating the occasions wherein the standard deviation varies substantially from the expected value as being indicative of external factors including transient temperature changes and mechanical pressure being applied to the disposable infusion cartridge. - View Dependent Claims (6, 7)
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Specification