Monitoring the seating status of a fluid reservoir in a fluid infusion device
First Claim
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1. A device for delivering fluid to a user, the device comprising:
- a housing;
a reservoir cavity within the housing to accommodate fluid reservoirs;
a drive motor assembly in the housing to regulate delivery of fluid by actuating a piston of a fluid reservoir;
a force sensor associated with the drive motor assembly to generate output levels in response to force imparted thereto; and
an electronics module coupled to the force sensor to process the output levels to determine a seating status of the fluid reservoir in the reservoir cavity, wherein the electronics module;
maintains a count that is indicative of the seating status;
stores an adaptive reference force value that corresponds to a previously recorded measure of actuation force imparted to the force sensor during a previous fluid delivery pulse;
obtains a current measure of actuation force imparted to the force sensor for a current fluid delivery pulse;
changes the count when the current measure of actuation force is less than the difference between the adaptive reference force value and a threshold force value, resulting in an updated count; and
generates a seating status alert when the updated count satisfies predetermined alert criteria.
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Abstract
A device for delivering fluid to a user includes a housing, a drive motor assembly in the housing, a force sensor, and an electronics module. The drive motor assembly regulates delivery of fluid by actuating a piston of a fluid reservoir, and the force sensor generates output levels in response to force imparted thereto during, for example, fluid delivery operations. The electronics module processes the output levels of the force sensor to assess the operating health of the force sensor, to check for occlusions in the fluid delivery path, and to monitor the seating status of the fluid reservoir.
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Citations
32 Claims
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1. A device for delivering fluid to a user, the device comprising:
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a housing;
a reservoir cavity within the housing to accommodate fluid reservoirs;a drive motor assembly in the housing to regulate delivery of fluid by actuating a piston of a fluid reservoir; a force sensor associated with the drive motor assembly to generate output levels in response to force imparted thereto; and an electronics module coupled to the force sensor to process the output levels to determine a seating status of the fluid reservoir in the reservoir cavity, wherein the electronics module; maintains a count that is indicative of the seating status; stores an adaptive reference force value that corresponds to a previously recorded measure of actuation force imparted to the force sensor during a previous fluid delivery pulse; obtains a current measure of actuation force imparted to the force sensor for a current fluid delivery pulse; changes the count when the current measure of actuation force is less than the difference between the adaptive reference force value and a threshold force value, resulting in an updated count; and generates a seating status alert when the updated count satisfies predetermined alert criteria. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for delivering fluid to a user, the device comprising:
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a housing;
a reservoir cavity within the housing to accommodate fluid reservoirs;a drive motor assembly in the housing to regulate delivery of fluid by actuating a piston of a fluid reservoir; a force sensor associated with the drive motor assembly to generate output levels in response to force imparted thereto; and an electronics module coupled to the force sensor to process the output levels to determine a seating status of the fluid reservoir in the reservoir cavity, wherein the electronics module; obtains measures of actuation force imparted to the force sensor for a number of consecutive fluid delivery pulses; calculates a pulse-to-pulse difference between two consecutive fluid delivery pulses, the pulse-to-pulse difference based on respective measures of actuation force for the two consecutive fluid delivery pulses; and initiates corrective action for the fluid infusion device when the pulse-to-pulse difference is greater than a threshold amount of force. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A device for delivering fluid to a user, the device comprising:
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a housing;
a reservoir cavity within the housing to accommodate fluid reservoirs;a drive motor assembly in the housing to regulate delivery of fluid by actuating a piston of a fluid reservoir; a force sensor associated with the drive motor assembly to generate output levels in response to force imparted thereto; and an electronics module coupled to the force sensor to process the output levels to determine a seating status of the fluid reservoir in the reservoir cavity, wherein the electronics module; obtains a baseline actuation force imparted to the force sensor, after initial seating and priming of the fluid reservoir; determines a measured actuation force imparted to the force sensor, the measured actuation force corresponding to a designated delivery stroke of the drive motor assembly; and generates indicia of an unseated reservoir condition when the measured actuation force is less than the baseline actuation force by at least a predetermined amount of force. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A device for delivering fluid to a user, the device comprising:
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a housing;
a reservoir cavity within the housing to accommodate fluid reservoirs;a drive motor assembly in the housing to regulate delivery of fluid by actuating a piston of a fluid reservoir; a force sensor associated with the drive motor assembly to generate output levels in response to force imparted thereto; and an electronics module coupled to the force sensor to process the output levels to determine a seating status of the fluid reservoir in the reservoir cavity, wherein the electronics module; confirms initial seating of the fluid reservoir in the reservoir cavity; determines a measure of actuation force imparted to the force sensor during a fluid delivery action of the drive motor assembly; compares the measure of actuation force to an amount of force that is less than normally expected actuation forces of the device, the amount of force being indicative of an unseated state of the fluid reservoir; and initiates corrective action for the device when the measure of actuation force is less than the amount of force. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A device for delivering fluid to a user, the device comprising:
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a housing;
a reservoir cavity within the housing to accommodate fluid reservoirs;a drive motor assembly in the housing to regulate delivery of fluid by actuating a piston of a fluid reservoir; a force sensor associated with the drive motor assembly to generate output levels in response to force imparted thereto; and an electronics module coupled to the force sensor to process the output levels to determine a seating status of the fluid reservoir in the reservoir cavity, wherein the electronics module; obtains a baseline actuation force imparted to the force sensor, after initial seating and priming of the fluid reservoir; determines a measured actuation force imparted to the force sensor, the measured actuation force corresponding to a designated delivery stroke of the drive motor assembly; and generates indicia of an unseated reservoir condition when the measured actuation force is less than the baseline actuation force by at least a predetermined amount. - View Dependent Claims (31, 32)
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Specification