Abstract: Described is method for maintaining proper drug delivery rate by monitoring atmospheric effects on a drug infusion device. The device may include one or more vents that permit the passage of gas between the exterior and interior of the device's housing. The device may also include one or more pressure and/or temperature sensors, the readings from which may be used to determine malfunctions in the venting of the device and/or changes in pressure that could cause the unintended over-delivery or under-delivery of medication.

Abstract: Described is drug infusion device configure to maintain its intended drug delivery rate by monitoring atmospheric effects. The device may include one or more vents that permit the passage of gas between the exterior and interior of the device's housing. The device may also include one or more pressure and/or temperature sensors, the readings from which may be used to determine malfunctions in the venting of the device and/or changes in pressure that could cause the unintended over-delivery or under-delivery of medication.

Abstract: Described is drug infusion device with one or more check valves for inhibiting the unintentional discharge of medication from a cartridge. The device includes a chamber capable of receiving a cartridge of medication in a fluid form and one or more novel check valves for ensuring the drug is not unintentionally released due to pressure differentials between the cartridge and the ambient pressure outside of the drug infusion device.

Abstract: Described is drug infusion device. The device is intended to permit the delivery of medication over an extended period of time.