Abstract: A drive motor for an infusion pump system includes a novel outer housing which includes a unitary member which defines a cavity adapted to receive a winding wherein the housing cavity has a length at least as long as length of the winding. In one embodiment, the housing unitary member has an opening at one end and is adapted to receive a housing end member which has a guide track for an armature. Such an arrangement facilitates assembly and disassembly of the motor for fabrication, inspection and repair purposes yet also facilitates proper alignment of the components when assembled. In another aspect, a push member positioned to be engaged by the armature has an engagement face which is at least 40% of the width of the armature engagement face. In still another aspect of the present inventions, the armature head portion is wider than the armature stem portion and has a length at least 10% of the winding length.

Abstract: An external infusion device system for infusing a fluid into a patient, the system including a reusable infusion device housing, a gas power source and disposable reservoir. The disposable reservoir is insertable into the reusable infusion device housing to infuse the fluid into the patient. The gas power source is for generating a gas to expel the fluid from the fluid reservoir. The disposable reservoir includes a reservoir housing, a fluid reservoir, an outlet, a gas power source, an expansion chamber and a regulating valve assembly. The fluid reservoir is within the reservoir housing for containing the fluid to be infused into the patient. The outlet is in the reservoir housing and provides a path through which the fluid is expelled to be infused into the patient. The expansion chamber is disposed between the gas power source and the fluid reservoir to receive the gas from the gas power source. The expansion member expands into the fluid reservoir to expel the fluid from the fluid reservoir.