Occlusion detection system and method

A computer program product residing on a non-transitory computer readable medium in an infusion pump assembly having a plurality of instructions stored thereon which, when executed by a processing logic, cause the processing logic to perform operations comprising:

• storing an infusible fluid in a reservoir assembly;
• displacing a plunger assembly that is operably connected to the reservoir assembly in response to signals received by a motor assembly from the processing logic;
• dispensing the infusible fluid from the reservoir assembly through a cannula assembly
• determining a first initial reading prior to dispensing a first dose of an infusible fluid;
• dispensing the first dose of the infusible fluid;
• monitoring a volume of the infusible fluid dispensed in the first dose;
• determining a second initial reading prior to dispensing a second dose of the infusible fluid;
• setting a first final reading value as being equal to the second initial reading;
• dispensing the second dose of the infusible fluid;
• monitoring a volume of the infusible fluid dispensed in the second dose;
• determining a second final reading subsequent to dispensing the second dose of the infusible fluid;
• determining a first rate-of-change reading that corresponds to the delivery of the first dose of the infusible fluid via an infusion pump assembly by subtracting the first initial reading from the first final reading value;
• determining at least a second rate-of-change reading that corresponds to the delivery of the second dose of the infusible fluid via the infusion pump assembly by subtracting the second initial reading from the second final reading;
• normalizing the first rate-of-change reading and the second rate-of-change reading to be indicative of the rates-of-change sensed for an equivalent quantity of infusible fluid;
• and
• determining an average rate-of-change reading based, at least in part upon the normalized first rate-of-change reading and the normalized at least a second rate-of-change reading.

An infusion pump assembly configured to perform operations comprising:

• storing an infusible fluid in a reservoir assembly;
• displacing a plunger assembly that is operably connected to the reservoir assembly in response to signals received by a motor assembly from a processing logic;
• dispensing the infusible fluid from the reservoir assembly through a cannula assembly
• determining a first initial reading prior to dispensing a first dose of an infusible fluid;
• dispensing the first dose of the infusible fluid;
• monitoring a volume of the infusible fluid dispensed in the first dose;
• determining a second initial reading prior to dispensing a second dose of the infusible fluid;
• setting a first final reading value as being equal to the second initial reading;
• dispensing the second dose of the infusible fluid;
• monitoring a volume of the infusible fluid dispensed in the second dose;
• determining a second final reading subsequent to dispensing the second dose of the infusible fluid;
• determining a first rate-of-change reading that corresponds to the delivery of the first dose of the infusible fluid via an infusion pump assembly by subtracting the first initial reading from the first final reading value;
• determining at least a second rate-of-change reading that corresponds to the delivery of the second dose of the infusible fluid via the infusion pump assembly by subtracting the second initial reading from the second final reading;
• normalizing the first rate-of-change reading and the second rate-of-change reading to be indicative of the rates-of-change sensed for an equivalent quantity of infusible fluid;
• and
• determining an average rate-of-change reading based, at least in part upon the normalized first rate-of-change reading and the normalized at least a second rate-of-change reading.