US Patent 7976505 Disposable infusion device negative pressure filling apparatus and method

An infusion system comprises a disposable wearable infusion device having a body arranged to be adhered to a patient's skin and a reservoir for holding a liquid medicament to be infused into the patient and a filler assembly arranged to be detachably received by the infusion device. The filler assembly is configured to receive a source of liquid medicament and provides a negative pressure to pull liquid medicament from the source of medicament to the infusion device reservoir.