Importance

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Abstract

A portable, patient-controlled medication delivery system includes an infusion pump, a catheter assembly and an extension tubing set. The infusion pump retains a treatment fluid and provides a drive mechanism for delivering the treatment fluid to a patient. The catheter assembly has a medicine catheter which penetrates directly into the treatment site of the patient and the extension tubing set has an extension tube which connects the medicine catheter and infusion pump. The infusion pump includes a fluid reservoir, a dosage chamber, and a displacement piston displacable within the dosage chamber. An elastic member is also positioned in the infusion pump to exert a displacement force on the displacement piston. The elastic member is alternately transitionable between a more stressed position and a less stressed position. The elastic member elastically displaces the displacement piston in a first direction to expand the dosage chamber and draw the treatment fluid from the fluid reservoir into the dosage chamber when the elastic member transitions from the more stressed position to the less stressed position. The displacement piston is manually displaced in a second direction to contract the dosage chamber and discharge the treatment fluid from the dosage chamber to the treatment site when the elastic member transitions from the less stressed position to the more stressed position.

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First Claim