Patient-controlled medication delivery system
First Claim
1. An infusion pump for delivering a medical treatment fluid to a patient comprising:
- a flexible fluid reservoir for storing a medical treatment fluid, said fluid reservoir having a medical treatment fluid inlet port and an inlet valve with an open position and a closed position;
a rigid dosage chamber having a fluid outlet for the medical treatment fluid;
a displacement piston displacable within said dosage chamber, a flowpath providing fluid communication between said fluid reservoir and said dosage chamber, and an elastic member connected to said displacement piston, said elastic member transitionable from a more stressed position to a less stressed position to charge said dosage chamber with said medical treatment fluid from said fluid reservoir while said inlet valve remains in said closed position blocking said medical treatment fluid inlet port and transitionable from said less stressed position to said more stressed position to discharge said medical treatment fluid from said dosage chamber via said fluid outlet, wherein said elastic member displaces said displacement piston in a first direction away from said fluid outlet to expand said dosage chamber when said elastic member transitions from said more stressed position to said less stressed position, and wherein said displacement piston is displaced in a second direction toward said fluid outlet to contract said dosage chamber when said elastic member transitions from said less stressed position to said more stressed position.
6 Assignments
0 Petitions
Accused Products
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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Citations
18 Claims
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1. An infusion pump for delivering a medical treatment fluid to a patient comprising:
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a flexible fluid reservoir for storing a medical treatment fluid, said fluid reservoir having a medical treatment fluid inlet port and an inlet valve with an open position and a closed position;
a rigid dosage chamber having a fluid outlet for the medical treatment fluid;
a displacement piston displacable within said dosage chamber, a flowpath providing fluid communication between said fluid reservoir and said dosage chamber, and an elastic member connected to said displacement piston, said elastic member transitionable from a more stressed position to a less stressed position to charge said dosage chamber with said medical treatment fluid from said fluid reservoir while said inlet valve remains in said closed position blocking said medical treatment fluid inlet port and transitionable from said less stressed position to said more stressed position to discharge said medical treatment fluid from said dosage chamber via said fluid outlet, wherein said elastic member displaces said displacement piston in a first direction away from said fluid outlet to expand said dosage chamber when said elastic member transitions from said more stressed position to said less stressed position, and wherein said displacement piston is displaced in a second direction toward said fluid outlet to contract said dosage chamber when said elastic member transitions from said less stressed position to said more stressed position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A medication delivery system comprising:
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an infusion pump including, a flexible fluid reservoir for storing a treatment fluid, said fluid reservoir having a treatment fluid inlet port and an inlet valve with an open position and a closed position, a rigid dosage chamber having a fluid outlet for the treatment fluid, a displacement piston slidably displacable within said dosage chamber, a flowpath providing fluid communication between said fluid reservoir and said dosage chamber, and an elastic member connected to said displacement piston, said elastic member transitionable from a more stressed position to a less stressed position to charge said dosage chamber with said treatment fluid from said fluid reservoir while said inlet valve remains in said closed position blocking said treatment fluid inlet port and transitionable from said less stressed position to said more stressed position to discharge said treatment fluid from said dosage chamber via said fluid outlet, wherein said elastic member displaces said displacement piston in a first direction away from said fluid outlet to expand said dosage chamber when said elastic member transitions from said more stressed position to said less stressed position, and wherein said displacement piston is displaced in a second direction toward said fluid outlet to contract said dosage chamber when said elastic member transitions from said less stressed position to said more stressed position; and
a medicine catheter having first and second ends and a flow cross-section, wherein said medicine catheter is in fluid communication with said fluid outlet of said dosage chamber, and wherein said first end of said medicine catheter is positionable in a treatment site of a patient to deliver the treatment fluid to the treatment site. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification