US Patent 7815609 Disposable infusion device positive 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. The infusion system further comprises a filler device arranged to be detachably received by the infusion device and to provide a positive pressure directly to the liquid medicament to transfer a volume of the liquid medicament to the infusion device reservoir.