US4391600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonpulsating IV pump and disposable pump chamber
Assignee: Graseby Medical Ltd
•
Filing: 1980-09-15
•
Granted: 1983-07-05
•
Expires: 2000-09-15
Abstract
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.
Inventors
- 👤 G. Kent Archibald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:30
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/14212; A61M5/14224; A61M5/168; A61M5/16831; A61M5/16854; A61M5/36; A61M5/365; F; F04; F04B; F04B43/00; F04B43/02; F04B43/021; F04B43/08; F04B43/082; F04B7/00; F04B9/00; F04B9/02; F04B9/04; F04B9/042; A61M2205/00; A61M2205/33; A61M2205/3331; A61M2205/3355; Y; Y10; Y10S; Y10S128/00; Y10S128/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
335 words
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.
Claim 2
Dependent Claim
335 words
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.
Claim 3
Dependent Claim
68 words
The volumetric infusion pump of claim 1 wherein the drive means causes relative motion of the first cylinder and first piston and relative motion of the second cylinder and second piston such that when the volume of the first chamber is increasing the volume of the second chamber is decreasing and when the volume of the first chamber is decreasing the volume of the second chamber is increasing.
Claim 4
Dependent Claim
77 words
The volumetric infusion pump of claim 2 wherein the valve control means causes the first valve means to permit fluid flow into the first pumping chamber when the volume of the first pumping chamber is increasing, and wherein the valve control means causes the second valve means to permit fluid flow from the first chamber to the second chamber when the volume of the first chamber is decreasing and the volume of the second chamber is increasing.
Claim 5
Dependent Claim
32 words
The volumetric infusion pump of claim 1 wherein the drive means comprises: a motor; and a cam shaft driven by the motor and having cams for driving the first and second pistons.
Claim 6
Dependent Claim
35 words
The volumetric infusion pump of claim 4 wherein the valve control means also comprises the motor and the cam shaft, and wherein the cam shaft has cams for driving the first and second valve means.
Claim 7
Dependent Claim
14 words
The volumetric infusion pump of claim 5 wherein the motor is a stepper motor.
References Cited (Backward Citations)
US1085818A
Cited
US1615140A
Cited
US1676114A
Cited
US2017974A
Cited
US2328406A
Cited
US2703084A
Cited
US2925814A
Cited
US3044655A
Cited
US3091239A
Cited
US3114257A
Cited
US3051530A
Cited
US3199511A
Cited
US3198385A
Cited
US3180235A
Cited
US3314594A
Cited
US3227092A
Cited
US3339464A
Cited
US3335724A
Cited
US3428042A
Cited
US3295458A
Cited
US3384080A
Cited
US3372624A
Cited
US3410779A
Cited
US3359910A
Cited
US3391644A
Cited
US3451393A
Cited
US3375759A
Cited
US3423939A
Cited
US3464359A
Cited
US3559644A
Cited
US3488763A
Cited
US3648694A
Cited
US3640277A
Cited
US3670926A
Cited
US3640276A
Cited
US3690318A
Cited
US3704080A
Cited
US3730650A
Cited
US3731679A
Cited
US3810719A
Cited
US3737251A
Cited
US3730495A
Cited
US3895741A
Cited
US3731680A
Cited
US3769879A
Cited
US3762280A
Cited
US3809507A
Cited
US3811800A
Cited
US3934480A
Cited
US3894538A
Cited
US3948589A
Cited
US3990444A
Cited
US3874826A
Cited
US3993069A
Cited
US3798982A
Cited
US3886938A
Cited
US3895631A
Cited
US3901231A
Cited
US3884228A
Cited
US3923060A
Cited
US3985133A
Cited
US3888239A
Cited
US4037598A
Cited
US4079737A
Cited
US4065230A
Cited
US4137913A
Cited
US3993061A
Cited
US4067332A
Cited
US3994294A
Cited
US3969991A
Cited
US4029094A
Cited
US3963024A
Cited
US3993065A
Cited
US4056043A
Cited
US4137940A
Cited
US4030495A
Cited
US4048474A
Cited
US4039269A
Cited
US4012173A
Cited
US4136692A
Cited
US4063551A
Cited
US4070946A
Cited
US4094318A
Cited
US4105028A
Cited
US4121584A
Cited
US4067334A
Cited
US4101057A
Cited
US4136693A
Cited
US4142524A
Cited
US4137915A
Cited
US4117727A
Cited
US4236880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |