US4236880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonpulsating IV pump and disposable pump chamber
Assignee: Graseby Medical Ltd
•
Filing: 1979-03-09
•
Granted: 1980-12-02
•
Expires: 1999-03-09
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
2026-10-22 21:03
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/36; A61M5/365; A61M5/14; A61M5/142; A61M5/14212; A61M5/14224; A61M5/168; A61M5/16831; A61M5/16854; F; F04; F04B; F04B43/00; F04B43/0009; F04B43/0054; 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; A61M2206/00; A61M2206/10; A61M2206/22
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
160 words
A pump comprising: a disposable pump chamber having an inlet, an outlet, and first and second flexible rolling diaphragm pumping chambers connected between the inlet and outlet; a pump housing for receiving the disposable pump chamber; a first cylinder in the housing positioned to receive the first flexible rolling diaphragm; a second cylinder in the pump housing positioned to receive the second flexible rolling diaphragm; a first piston movable in the first cylinder; a second piston movable in the second cylinder; first valve means for controlling fluid flow between the inlet and the first flexible rolling diaphragm pumping chamber; second valve means for controlling the fluid flow between the first flexible rolling diaphragm pumping chamber and the second flexible rolling diaphragm chamber; and drive means for causing relative motion of the first cylinder and first piston and relative motion of the second cylinder and second piston to vary the volumes of the first and second flexible rolling diaphragm pumping chambers.
Claim 2
Dependent Claim
160 words
A pump comprising: a disposable pump chamber having an inlet, an outlet, and first and second flexible rolling diaphragm pumping chambers connected between the inlet and outlet; a pump housing for receiving the disposable pump chamber; a first cylinder in the housing positioned to receive the first flexible rolling diaphragm; a second cylinder in the pump housing positioned to receive the second flexible rolling diaphragm; a first piston movable in the first cylinder; a second piston movable in the second cylinder; first valve means for controlling fluid flow between the inlet and the first flexible rolling diaphragm pumping chamber; second valve means for controlling the fluid flow between the first flexible rolling diaphragm pumping chamber and the second flexible rolling diaphragm chamber; and drive means for causing relative motion of the first cylinder and first piston and relative motion of the second cylinder and second piston to vary the volumes of the first and second flexible rolling diaphragm pumping chambers.
Claim 3
Dependent Claim
49 words
The pump claimed in claim 1 wherein the disposable pump chamber has a first flexible section connecting the inlet and the first flexible rolling diaphragm pumping chamber and has a second flexible section connecting the first flexible rolling diaphragm pumping chamber and the second flexible rolling diaphragm pumping chamber.
Claim 4
Dependent Claim
25 words
The pump of claim 1 wherein the first and second valve means control fluid flow by controllably constricting the first and second flexible sections, respectively.
Claim 5
Dependent Claim
82 words
The 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 flexible rolling diaphragm pumping chamber is increasing the volume of the second flexible rolling diaphragm pumping chamber is decreasing and when the volume of the first flexible rolling diaphragm pumping chamber is decreasing the volume of the second flexible rolling diaphragm pumping chamber is increasing.
Claim 6
Dependent Claim
77 words
The pump of claim 4 wherein the first valve means permits fluid flow into the first flexible rolling diaphragm pumping chamber when the volume of the first flexible rolling diaphragm pumping chamber is increasing, and wherein the second valve means permits fluid flow from the first flexible rolling diaphragm pumping chamber to the second flexible rolling diaphragm pumping chamber when the volume of the first chamber is decreasing and the volume of the second chamber is increasing.
Claim 7
Dependent Claim
30 words
The 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 8
Dependent Claim
20 words
The pump of claim 6 wherein the cam shaft also has cams for driving the first and second valve means.
Claim 9
Dependent Claim
12 words
The pump of claim 7 wherein the motor is a stepper motor.
Claim 10
Dependent Claim
35 words
The pump of claim 1 and further comprising: back pressure sensing means for sensing fluid pressure within the disposable pump chamber at a potsition between the second flexible rolling diaphragm pumping chamber and the outlet.
Claim 11
Dependent Claim
29 words
The pump of claim 9 wherein the disposable pump chamber further comprises: a third flexible rolling diaphragm chamber between the second flexible rolling diaphragm pumping chamber and the outlet.
Claim 12
Dependent Claim
24 words
The pump of claim 10 wherein the back pressure sensing means comprises: means for sensing fluid pressure within the third flexible rolling diaphragm chamber.
Claim 13
Dependent Claim
37 words
The pump of claim 11 wherein the means for sensing fluid pressure comprises: a third cylinder; and a third piston movable within the third cylinder in response to fluid pressure within the third flexible rolling diaphragm chamber.
Claim 14
Dependent Claim
70 words
The pump of claim 12 wherein the means for sensing fluid pressure further comprises: a movable electric contact connected to and movable with the third piston; a first fixed contact located at a fixed position with respect to the third cylinder; and spring means for applying a spring force to the third piston in a direction opposite to force supplied by fluid pressure within the third flexible rolling diaphragm chamber.
Claim 15
Dependent Claim
30 words
The pump of claim 13 wherein the movable electric contact breaks contact with the first fixed contact when a first pressure within the third flexible rolling diaphragm chamber is attained.
Claim 16
Dependent Claim
46 words
The pump of claim 14 and further comprising: a second fixed contact located at a fixed position with respect to the third cylinder, wherein the movable electric contact engages the second fixed contact when a second pressure within the third flexible rolling diaphragm chamber is attained.
Claim 17
Dependent Claim
22 words
The pump of claim 15 and further comprising: adjusting means for adjusting the fixed positions of the first and second fixed contacts.
Claim 18
Dependent Claim
27 words
The pump of claim 1 and further comprising: bubble sensor means for sensing the presence of an air bubble in the fluid within the disposable pump chamber.
Claim 19
Dependent Claim
17 words
The pump of claim 17 wherein the bubble sensor means is external to the disposable pump chamber.
Claim 20
Dependent Claim
32 words
The pump of claim 18 wherein the bubble sensor means comprises: first and second capacitive sensor means for sensing capacitance of the disposable pump chamber and fluid therein at two different positions.
Claim 21
Dependent Claim
46 words
The pump of claim 19 wherein the first and second capacitive sensor means comprise a common electrode positioned on one side of the disposable pump chamber, and first and second spaced electrodes positioned on an opposite side of the disposable pump chamber, opposite the common electrode.
Claim 22
Dependent Claim
30 words
The pump of claim 20 wherein the bubble sensor means further comprises: means for sensing differences in capacitance between the first capacitive sensor means, and the second capacitive sensor means.
Claim 23
Dependent Claim
43 words
The pump of claim 1 wherein the pump housing comprises: diaphragm enclosure means having the first and second cylinders formed therein; and cover means for covering the disposable pump chamber when the disposable pump chamber is in position on the diaphragm enclosure means.
Claim 24
Dependent Claim
15 words
The pump of claim 22 wherein the diaphragm cover means is formed of transparent material.
Claim 25
Dependent Claim
20 words
The pump of claim 22 and further comprising: hinge means for connecting the cover means and the diaphragm enclosure means.
Claim 26
Dependent Claim
24 words
The pump of claim 22 and further comprising latch means for latching the cover means and the diaphragm enclosure means in a closed position.
Claim 27
Dependent Claim
18 words
The pump of claim 25 and further comprising: means for sensing whether the cover means is latched closed.
Claim 28
Dependent Claim
30 words
The pump of claim 22 and further comprising: registration means on the pump housing for ensuring proper registration of the disposable pump chamber with respect to the diaphragm enclosure means.
Claim 29
Dependent Claim
52 words
The pump of claim 27 wherein the registration means comprises: a registration pin on a top surface of the diaphragm enclosure means; and a registration hole in the disposable pump chamber for receiving the registration pin when the disposable pump chamber is in proper registration with respect to the diaphragm enclosure means.
Claim 30
Dependent Claim
18 words
The pump of claim 22 wherein the first and second valve means extend through the diaphragm enclosure means.
Claim 31
Dependent Claim
52 words
The pump of claim 29 wherein the drive means comprises: a motor; a cam shaft driven by the motor and having cams for driving the first and second pistons and the first and second valve means; and cam housing means connected to the diaphragm enclosure means for rotatably supporting the cam shaft.
Claim 32
Dependent Claim
37 words
The pump of claim 30 wherein the cam housing means and the diaphragm enclosure means are movably connected and wherein spring means apply a force tending to separate the cam housing means and the diaphragm enclosure means.
Claim 33
Dependent Claim
63 words
The pump of claim 31 and further comprising: hinge means for connecting the cover means and the diaphragm enclosure means; first latching means for latching the cover means and the diaphragm enclosure means in a closed position; and second latching means for holding the diaphragm enclosure means against the force applied by the spring means in a position proximate the cam housing means.
Claim 34
Dependent Claim
16 words
The pump of claim 30 and further comprising: means for sensing rotation of the cam shaft.
Claim 35
Dependent Claim
30 words
The pump of claim 22 wherein the diaphragm enclosure means has depressions in its top surface for draining fluid in the event of a leak in the disposable pump chamber.
Claim 36
Dependent Claim
30 words
The pump of claim 1 wherein the disposable pump chamber further comprises inlet tubing connected to the inlet and outlet tubing connected at the outlet of the disposable pump chamber.
Claim 37
Dependent Claim
155 words
For use in a pump having a pump housing, first and second cylinders in the housing, first and second pistons movable in the first and second cylinders, respectively, first and second valve means for controlling fluid flow, and drive means for causing relative motion of the first cylinder and the first piston and relative motion of the second cylinder and the second piston, a disposable pump chamber comprising: an inlet, an outlet, first and second flexible rolling diaphragm pumping chambers, a first connecting section for connecting the inlet and the first flexible rolling diaphragm pumping chamber, a second connecting section connecting the first and second flexible rolling diaphragm pumping chambers, and a third connecting section connecting the second flexible rolling diaphragm pumping chamber and the outlet, the first and second flexible rolling diaphragm pumping chambers being positioned in the first and second cylinders, respectively, when the disposable pump chamber is positioned in the pump housing.
Claim 38
Dependent Claim
155 words
For use in a pump having a pump housing, first and second cylinders in the housing, first and second pistons movable in the first and second cylinders, respectively, first and second valve means for controlling fluid flow, and drive means for causing relative motion of the first cylinder and the first piston and relative motion of the second cylinder and the second piston, a disposable pump chamber comprising: an inlet, an outlet, first and second flexible rolling diaphragm pumping chambers, a first connecting section for connecting the inlet and the first flexible rolling diaphragm pumping chamber, a second connecting section connecting the first and second flexible rolling diaphragm pumping chambers, and a third connecting section connecting the second flexible rolling diaphragm pumping chamber and the outlet, the first and second flexible rolling diaphragm pumping chambers being positioned in the first and second cylinders, respectively, when the disposable pump chamber is positioned in the pump housing.
Claim 39
Dependent Claim
19 words
The disposable pump chamber of claim 36 wherein the third connecting section includes a third flexible rolling diaphragm chamber.
Claim 40
Dependent Claim
23 words
The disposable pump chamber of claim 36 and further comprising: inlet tubing connected at the inlet; and outlet tubing connected at the outlet.
Claim 41
Dependent Claim
39 words
The disposable pump chamber of claim 38 and further comprising: a first tapered transition section between the inlet tubing and the first connecting section; and a second tapered transition section between the third connecting section and the outlet tubing.
Claim 42
Dependent Claim
21 words
The disposable pump chamber of claim 36 wherein the disposable pump chamber has top and bottom parts which are joined together.
Claim 43
Dependent Claim
16 words
The disposable pump chamber of claim 40 wherein the top and bottom parts are heat-sealed together.
Claim 44
Dependent Claim
28 words
The disposable pump chamber of claim 40 and further comprising: inlet tubing and outlet tubing bonded between the top and bottom parts at the inlet and outlet, respectively.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |