Importance

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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. In yet another aspect of the present inventions the push member may have a single diameter cylindrical shape and the push member guide track similarly may have a single diameter cylindrical shape which is sized to slidingly receive the push member. It is believed that one or more of these features can increase the actuation force provided by the motor yet maintain a compact size.

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First Claim