Nonpulsating IV pump and disposable pump chamber
First Claim
1. A volumetric infusion pump for pumping fluid from a source to a patient comprising:
- a pump inlet for receiving fluid from the source;
a pump outlet for supplying fluid under pressure to the patient;
a pump housing having first and second cylinders therein;
a first pumping chamber including the first cylinder, a first piston movable in the first cylinder, first flexible rolling diaphragm means between the first cylinder and the first piston, a first inlet, and a first outlet, the first pumping chamber having a variable volume depending upon the position of the first piston in the first cylinder;
a second pumping chamber including the second cylinder, a second piston movable in the second cylinder, second flexible rolling diaphragm means between the second cylinder and the second piston, a second inlet connected to the first outlet, and a second outlet connected to the pump outlet, the second pumping chamber having a variable volume depending upon the position of the second piston in the second cylinder;
first valve means supported by the pump housing for controlling fluid flow between the pump inlet and the first inlet;
second valve means supported by the pump housing for controlling the fluid flow between the first outlet and the second inlet;
drive means for causing motion of the first piston in the first cylinder and motion of the second piston in the second cylinder;
valve control means for controlling the first and second valve means such that one of the first and second valve means is closed at all times; and
wherein the first and second flexible diaphragm means, the pump inlet, and the pump outlet form an integral disposable pump chamber having a sealed main fluid flow passage between the pump inlet and the pump outlet, so that fluid is pumped from the pump inlet to the pump outlet without physically contacting the pump housing, the first and second cylinders, the first and second pistons, the first and second valve means, the drive means or the valve control means.
4 Assignments
0 Petitions
Accused Products
Abstract
A small, accurate, reliable and economical pump which is particularly useful in intravenous (IV) feeding includes a disposable pump chamber and a pump housing. The disposable pump chamber has an inlet, an outlet, and first and second flexible rolling diaphragm pumping chambers. First and second cylinders in the pump housing are positioned to receive the first and second flexible rolling diaphragms of the disposable pump chamber. First and second pistons are movable in the first and second cylinders, respectively. In addition, first and second valves are provided in the pump housing. The first valve controls fluid flow between the inlet and the first flexible rolling diaphragm pump chamber, while the second valve controls fluid flow between the first flexible rolling diaphragm pumping chamber and the second flexible rolling diaphragm pumping chamber. A motor and cam shaft drive the first and second pistons and the first and second valves. The first and second valves are controlled so that one valve is closed at all times, thereby providing fail safe operation of the pump.
208 Citations
6 Claims
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1. A volumetric infusion pump for pumping fluid from a source to a patient comprising:
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a pump inlet for receiving fluid from the source; a pump outlet for supplying fluid under pressure to the patient; a pump housing having first and second cylinders therein; a first pumping chamber including the first cylinder, a first piston movable in the first cylinder, first flexible rolling diaphragm means between the first cylinder and the first piston, a first inlet, and a first outlet, the first pumping chamber having a variable volume depending upon the position of the first piston in the first cylinder; a second pumping chamber including the second cylinder, a second piston movable in the second cylinder, second flexible rolling diaphragm means between the second cylinder and the second piston, a second inlet connected to the first outlet, and a second outlet connected to the pump outlet, the second pumping chamber having a variable volume depending upon the position of the second piston in the second cylinder; first valve means supported by the pump housing for controlling fluid flow between the pump inlet and the first inlet; second valve means supported by the pump housing for controlling the fluid flow between the first outlet and the second inlet; drive means for causing motion of the first piston in the first cylinder and motion of the second piston in the second cylinder; valve control means for controlling the first and second valve means such that one of the first and second valve means is closed at all times; and wherein the first and second flexible diaphragm means, the pump inlet, and the pump outlet form an integral disposable pump chamber having a sealed main fluid flow passage between the pump inlet and the pump outlet, so that fluid is pumped from the pump inlet to the pump outlet without physically contacting the pump housing, the first and second cylinders, the first and second pistons, the first and second valve means, the drive means or the valve control means. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification