INFUSION DEVICE OCCLUSION DETECTION SYSTEM

摘要

Device and method embodiments are described which are capable of detecting and alerting a user of an infusion device to a hindrance in the ability to deliver measured quantities of fluids. In some cases, the devices and method embodiments for such occlusion detection do not require significant modification of an infusion device and can be carried out with a minimum of additional components.

主权项

1. A method for detecting occlusions during use of an infusion device, comprising:
generating a plurality of residual sum values from a plurality of respective variable volumes dispensed from the infusion device, each variable volume being dispensed by—
performing a plurality of dispense cycles with the infusion device, each dispense cycle comprising—
providing power to a motor of the infusion device to generate a motive force;translating a spool slidably disposed within a bore with the motive force from the motor;transferring a sub-variable volume of fluid from a variable volume cavity of the spool into an output port which is in fluid communication with the bore as a volume of the variable volume cavity is decreased by the motion of the spool;terminating the power to the motor; andmeasuring a residual displacement datum of the spool while no power is provided to the motor with a position measurement device by measuring the difference in a position of the spool at the termination of the power to the motor and a position of the spool at a cessation of motion of the spool; andsumming the residual displacement data from each dispense cycle performed while dispensing the respective volume of fluid in order to generate a respective residual sum value; individually loading a plurality of successive residual sum values into a filter with each residual sum value generating a respective filter output, the filter output being a running weighted average of residual sum values which have been loaded into the filter to generate a nominal filter output value; comparing a plurality of residual sum values generated subsequent to the generation of the nominal filter output value to the nominal filter output value in order to determine if each residual sum value exceeds the nominal filter output value by a threshold difference value; and alerting a user of the infusion device to an occlusion if a plurality of successive residual sum values surpass the nominal filter output value by the threshold difference value.