US4410322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonpulsating TV pump and disposable pump chamber
Assignee: Graseby Medical Ltd
•
Filing: 1980-09-10
•
Granted: 1983-10-18
•
Expires: 2000-09-10
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 eceive 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 fist 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
2026-10-23 01:41
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/168; A61M5/16831; A61M5/16854; A61M5/142; A61M5/14212; A61M5/14224; 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; A61M2206/00; A61M2206/10; A61M2206/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
378 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 first pumping chamber having a first cylinder, a first piston, first flexible 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 relative positions of the first cylinder and first piston; a second pumping chamber having a second cylinder, a second piston, second flexible diaphragm means between the second cylinder and the second piston, the second inlet connected to the first outlet, and a second outlet, the second pumping chamber having a variable volume depending upon the relative position of the second cylinder and second piston; a third chamber having a third inlet and a third outlet, the third inlet being connected to the second outlet and the third outlet being connected to the pump outlet, the third chamber comprising a third cylinder, a third piston, and a third flexible diaphragm means between the third cylinder and the third piston so that the third piston moves in the third cylinder as a function of fluid pressure within the third chamber; means for sensing fluid pressure within the third chamber by sensing position of the third piston; first valve means for controlling fluid flow between the pump inlet and the first inlet; second valve means for controlling fluid flow between the first outlet and the second inlet; drive means for causing relative motion of the first cylinder and first piston and relative motion of the second cylinder and second piston; 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, second and third flexible diaphragm means, the pump inlet and the pump outlet form an integral disposable unit 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 housing, the cylinders, the pistons, the valve means, the drive means, or the valve control means.
Claim 2
Dependent Claim
378 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 first pumping chamber having a first cylinder, a first piston, first flexible 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 relative positions of the first cylinder and first piston; a second pumping chamber having a second cylinder, a second piston, second flexible diaphragm means between the second cylinder and the second piston, the second inlet connected to the first outlet, and a second outlet, the second pumping chamber having a variable volume depending upon the relative position of the second cylinder and second piston; a third chamber having a third inlet and a third outlet, the third inlet being connected to the second outlet and the third outlet being connected to the pump outlet, the third chamber comprising a third cylinder, a third piston, and a third flexible diaphragm means between the third cylinder and the third piston so that the third piston moves in the third cylinder as a function of fluid pressure within the third chamber; means for sensing fluid pressure within the third chamber by sensing position of the third piston; first valve means for controlling fluid flow between the pump inlet and the first inlet; second valve means for controlling fluid flow between the first outlet and the second inlet; drive means for causing relative motion of the first cylinder and first piston and relative motion of the second cylinder and second piston; 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, second and third flexible diaphragm means, the pump inlet and the pump outlet form an integral disposable unit 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 housing, the cylinders, the pistons, the valve means, the drive means, or the valve control means.
Claim 3
Dependent Claim
72 words
The volumetric infusion pump of claim 1 wherein the means for sensing fluid pressure within the third chamber 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 chamber; 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 chamber.
Claim 4
Dependent Claim
29 words
The volumetric infusion pump of claim 2 wherein the movable electric contact breaks contact with the first fixed contact when a first pressure within the third chamber is attained.
Claim 5
Dependent Claim
45 words
The volumetric infusion pump of claim 3 and further comprising: a second fixed contact located at a fixed position with respect to the third chamber, wherein the movable electric contact engages the second fixed contact when a second pressure within the third chamber is attained.
Claim 6
Dependent Claim
24 words
The volumetric infusion pump of claim 4 and further comprising: adjusting means for adjusting the fixed positions of the first and second fixed contacts.
Claim 7
Dependent Claim
297 words
A volumetric infusion pump for pumping fluid from a source to a patient, the pump comprising: pump housing means; a sealed integral disposable unit, which is supported by the pump housing means during operation of the pump, comprising: an inlet for receiving fluid from the the source; an outlet for supplying fluid under pressure to the patient; a sealed main flow passage between the inlet and the outlet; flexible rolling diaphragm pumping chamber means connected to the main flow passage for pumping fluid from the inlet to the outlet; a flexible pressure sensing chamber connected to the main flow passage between the flexible rolling diaphragm pumping chamber means and the outlet, the flexible pressure sensing chamber having a flexible rolling diaphragm which is movable as a function of fluid pressure within the flexible rolling diaphragm pumping chamber means; piston means supported by the pump housing means for engaging the flexible rolling diaphragm means when the sealed integral disposable unit is supported by the pump housing means during operation of the pump; pump drive means supported by the pump housing means for moving the piston means to cause the rolling diaphragm pumping chamber means to pump fluid from the inlet to the outlet; valve means for controlling fluid flow through the main flow passage between the flexible rolling diaphragm pumping chamber means and the flexible pressure sensing chamber; and means supported by the pump housing means external to the flexible pressure sensing chamber and responsive to movement of the flexible diaphragm for providing an output which is a function of fluid pressure within the pressure sensing chamber, so that fluid is pumped from the inlet to the outlet without physically contacting the pump housing means, the pump drive means, or the means external to the pressure sensing chamber.
Claim 8
Dependent Claim
297 words
A volumetric infusion pump for pumping fluid from a source to a patient, the pump comprising: pump housing means; a sealed integral disposable unit, which is supported by the pump housing means during operation of the pump, comprising: an inlet for receiving fluid from the the source; an outlet for supplying fluid under pressure to the patient; a sealed main flow passage between the inlet and the outlet; flexible rolling diaphragm pumping chamber means connected to the main flow passage for pumping fluid from the inlet to the outlet; a flexible pressure sensing chamber connected to the main flow passage between the flexible rolling diaphragm pumping chamber means and the outlet, the flexible pressure sensing chamber having a flexible rolling diaphragm which is movable as a function of fluid pressure within the flexible rolling diaphragm pumping chamber means; piston means supported by the pump housing means for engaging the flexible rolling diaphragm means when the sealed integral disposable unit is supported by the pump housing means during operation of the pump; pump drive means supported by the pump housing means for moving the piston means to cause the rolling diaphragm pumping chamber means to pump fluid from the inlet to the outlet; valve means for controlling fluid flow through the main flow passage between the flexible rolling diaphragm pumping chamber means and the flexible pressure sensing chamber; and means supported by the pump housing means external to the flexible pressure sensing chamber and responsive to movement of the flexible diaphragm for providing an output which is a function of fluid pressure within the pressure sensing chamber, so that fluid is pumped from the inlet to the outlet without physically contacting the pump housing means, the pump drive means, or the means external to the pressure sensing chamber.
Claim 9
Dependent Claim
46 words
The invention of claim 6 wherein the means external to the pressure sensing chamber comprises: a cylinder for receiving the flexible rolling diaphragm pressure sensing chamber; and a piston movable within the cylinder in response to fluid pressure within the flexible rolling diaphragm pressure sensing chamber.
Claim 10
Dependent Claim
70 words
The invention of claim 7 wherein the means external to the pressure sensing chamber further comprises: a movable electric contact connected to and movable with the piston; a first fixed contact located at a fixed position with respect to the cylinder; and spring means for applying a spring force to the piston in a direction opposite the force supplied by fluid pressure within the flexible rolling diaphragm pressure sensing chamber.
Claim 11
Dependent Claim
31 words
The invention of claim 8 wherein the movable electric contact breaks contact with the first fixed contact when a first pressure within the flexible rolling diaphragm pressure sensing chamber is attained.
Claim 12
Dependent Claim
46 words
The invention of claim 9 and further comprising: a second fixed contact located at a fixed position with respect to the cylinder, wherein the movable electric contact engages the second fixed contact when a second pressure within the flexible rolling diaphragm pressure sensing chamber is attained.
Claim 13
Dependent Claim
22 words
The invention of claim 9 and further comprising: adjusting means for adjusting the fixed positions of the first and second fixed contacts.
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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) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |