Patent ID: 9180243
Filing Date: 2015-11-10
Classification: A61M

Abstract:
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.