Occlusion detection for a fluid infusion device
First Claim
1. A method of detecting occlusions in a fluid path of a fluid infusion device having a drive motor assembly that actuates a fluid reservoir by applying actuation force to a piston of the fluid reservoir, the method comprising:
- initiating a fluid delivery action intended to deliver an amount of fluid from the fluid reservoir;
determining measures of fluid pressure in the fluid path for the fluid delivery action;
indicating an occlusion when a first rate of change of the measures of fluid pressure is greater than or equal to first threshold value, the first rate of change based upon a first measurement window; and
indicating an occlusion when both;
(a) a second rate of change of the measures of fluid pressure is greater than or equal to a second threshold value, the second rate of change based upon a second measurement window; and
(b) a current measure of fluid pressure is greater than or equal to a threshold force value.
1 Assignment
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Accused Products
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
17 Claims
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1. A method of detecting occlusions in a fluid path of a fluid infusion device having a drive motor assembly that actuates a fluid reservoir by applying actuation force to a piston of the fluid reservoir, the method comprising:
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initiating a fluid delivery action intended to deliver an amount of fluid from the fluid reservoir; determining measures of fluid pressure in the fluid path for the fluid delivery action; indicating an occlusion when a first rate of change of the measures of fluid pressure is greater than or equal to first threshold value, the first rate of change based upon a first measurement window; and indicating an occlusion when both;
(a) a second rate of change of the measures of fluid pressure is greater than or equal to a second threshold value, the second rate of change based upon a second measurement window; and
(b) a current measure of fluid pressure is greater than or equal to a threshold force value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of detecting occlusions in a fluid path of a fluid infusion device having a drive motor assembly that actuates a fluid reservoir by applying actuation force to a piston of the fluid reservoir, the method comprising:
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initiating a fluid delivery action intended to deliver an amount of fluid from the fluid reservoir; determining measures of fluid pressure in the fluid path for the fluid delivery action; indicating an occlusion when a first rate of change of the measures of fluid pressure is greater than or equal to first threshold value, the first rate of change based upon a first measurement window that represents a first delivered volume, relative to a reference volume; and indicating an occlusion when both;
(a) a second rate of change of the measures of fluid pressure is greater than or equal to a second threshold value, the second rate of change based upon a second measurement window that represents a second delivered volume, relative to the reference volume; and
(b) a current measure of fluid pressure is greater than or equal to a threshold force value. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification