PUMPING SYSTEM

• US 20140363313A1
• Filed: 12/13/2013
• Published: 12/11/2014
• Est. Priority Date: 06/11/2013
• Status: Active Grant

• Current Assignee: Altra Inc.
• Original Assignee: Matthew G. Morris Jr
• Inventors: MORRIS, Matthew G. Jr.
• Granted Patent: US 9,714,650 B2
• Time in Patent Office: Days
• US Class Current: 417/63
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/128 with incorporated valves
• CPC Class Codes: A61M 5/14224 Diaphragm type
• CPC Class Codes: A61M 5/14228 with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member
• CPC Class Codes: F04B 43/0054 particularities of the flexible members
• CPC Class Codes: F04B 43/025 two or more plate-like pumping members in parallel
• CPC Class Codes: F04B 43/026 each plate-like pumping flexible member working in its own pumping chamber
• CPC Class Codes: F04B 43/028 with in- or outlet valve arranged in the plate-like flexible member valve arranged in the piston F04B53/12

Abstract

Provided is a pumping system that includes a parallel dual chamber pumping mechanism and an attachable disposable cassette. The disposable cassette includes a multi-laminate membrane which facilitates efficient, accurate and uniform delivery of fluids. The multi-laminate membrane is held in intimate contact with the pumping fingers of the pumping mechanism by electrostatic or magnetic attraction, thereby allowing the pump to pull a vacuum without the need for a preloaded elastomeric pumping segment.

Claims

1. A pumping system comprising:

(a) a disposable cassette comprising;

(i) a body having a sealed top side, an open bottom side, an inlet port disposed on a first end and an outlet port disposed on a second end;

(ii) a first pumping chamber disposed within the open bottom side between a first inlet valve and a first outlet valve;

(iii) a second pumping chamber disposed within the open bottom side between a second inlet valve and a second outlet valve, wherein the first and second pumping chambers are positioned in parallel with each other; and

(iv) a multi-laminate membrane adhered to and sealing the open bottom side defining a fluid path between the inlet port and the outlet port; and

(b) a pumping mechanism comprising;

(i) a chassis configured for removable attachment to the disposable cassette;

(ii) a motor disposed within a length of the chassis and positioned in parallel to the flow path;

(iii) a camshaft disposed adjacent to and in mechanical communication with the motor, wherein the camshaft comprises a plurality of lobes disposed along a length thereof;

(iv) a first finger drive arm hingedly attached to the chassis and positioned parallel to the motor, wherein a bottom portion of the first finger drive arm is in mechanical communication with the camshaft;

(v) a second finger drive arm hingedly attached to the chassis and positioned opposing the first finger drive arm, wherein a bottom portion of the second finger drive arm is in mechanical communication with the camshaft, and wherein the first and second finger drive arms are 180°

out of phase with each other;

(vi) an array of permanent magnets fixedly attached to a top portion of the first and second finger drive arms, wherein the permanent magnets are configured for magnetic attachment to the multi-laminate membrane; and

(v) a plurality of valve arms hingedly attached to the chassis, wherein a lower portion of each valve arm is in mechanical communication with one of the plurality of lobes on the camshaft and an upper portion of each valve arm is configured to respectively actuate each of the first and second inlet valves and the first and second outlet valves.

2. The pumping system of claim 1, wherein the camshaft comprises an inlet valve lobe and an outlet valve lobe, each disposed at opposite ends of the camshaft and 180°

out of phase from each other.

3. The pumping system of claim 1, wherein the plurality of valve arms comprises a first and second inlet valve arm, and a first and second outlet valve arm, wherein the first inlet valve and second outlet valve arms are configured to actuate the respective valves simultaneously, and wherein the second inlet valve and first outlet valve arms are configured to actuate the respective valves simultaneously.

4. The pumping system of claim 1, wherein plurality of lobes comprises a main lobe configured to actuate each of the first and second finger drive arms, a first valve lobe, and a second valve lobe, wherein the first valve lobe is configured to actuate the valve arms corresponding to the first and second inlet valves, and the second valve lobe is configured to actuate the valve arms corresponding to the first and second outlet valves.

5. The pumping system of claim 1, wherein an inner surface of the first and second pumping chambers is angled in accordance with a range of motion of each of the first and second pumping finger face plates.

6. The pumping system of claim 1, wherein the multi-laminate membrane is a thin film paramagnetic membrane or a conductive membrane.

7. The pumping system of claim 6, wherein the thin film multi-laminate membrane comprises a first layer configured to adhere to the open bottom side of the body, a second layer configured to be paramagnetic and electrically conductive, and a third layer configured to resist abrasion, wherein the first, second, and third layers are laminated as a single membrane.

8. The pumping system of claim 1, further comprising a plurality of strain gauges disposed on the pumping mechanism and configured to monitor fluid pressure within the first and second pumping chambers.

9. The pumping system of claim 8, wherein the plurality of strain gauges comprises a first and a second strain gauge, each disposed on one of the first and second finger drive arms.

10. The pumping system of claim 8, wherein the plurality of strain gauges comprises a first and a second strain gauge, each disposed on a surface of one of the first and second pumping finger drive arms in contact with the multi-laminate membrane.

11. The pumping system of claim 10, wherein the first and second strain gauges are disposed on the surface opposite to the magnetic attachment to the multi-laminate membrane.

12. The pumping system of claim 1, wherein the inlet port is configured for fluid communication with a fluid reservoir and the outlet port is configured for attachment to downstream supply tubing for intravenous administration of the fluid to a subject.

13. A disposable cassette for use in a pumping system comprising:

(a) a body having a sealed top side, an open bottom side, an inlet port disposed on a first end and an outlet port disposed on a second end;

(b) a first pumping chamber disposed within the open bottom side between a first inlet valve and a first outlet valve;

(c) a second pumping chamber disposed within the open bottom side between a second inlet valve and a second outlet valve, wherein the first and second pumping chambers are positioned in parallel with each other; and

(d) a multi-laminate membrane adhered to and sealing the open bottom side defining a fluid path between the inlet port and the outlet port.

14. The disposable cassette of claim 13, wherein an inner surface of the first and second pumping chambers is angled in accordance with a range of motion of pumping finger face plates of a pumping mechanism.

15. The disposable cassette of claim 13, wherein the multi-laminate membrane is a thin film paramagnetic membrane.

16. The disposable cassette of claim 15, wherein the thin film multi-laminate membrane comprises a first layer configured to adhere to the open bottom side of the body, a second layer configured to hold a static charge and be attracted by a magnetic field, and a third layer configured to resist abrasion, wherein the first, second, and third layers are laminated as a single membrane.

17. The disposable cassette of claim 13, wherein the multi-laminate membrane is ultrasonically welded, heat-sealed, or solvent-bonded to the open end of the body.

18. The disposable cassette of claim 13, wherein each of the first inlet valve, second inlet valve, first outlet valve, and second outlet valve are independently operable.

19. The disposable cassette of claim 13, wherein the inlet port is configured for fluid communication with a fluid reservoir and the outlet port is configured for attachment to downstream supply tubing for intravenous administration of the fluid to a subject.

20. A pumping mechanism comprising:

(a) a chassis configured for removable attachment to the disposable cassette;

(b) a motor disposed within a length of the chassis and positioned in parallel to the flow path;

(c) a camshaft disposed adjacent to and in mechanical communication with the motor, wherein the camshaft comprises a plurality of lobes disposed along a length thereof;

(d) a first finger drive arm hingedly attached to the chassis and positioned parallel to the motor, wherein a bottom portion of the first finger drive arm is in mechanical communication with the camshaft;

(e) a second finger drive arm hingedly attached to the chassis and positioned opposing the first finger drive arm, wherein a bottom portion of the second finger drive arm is in mechanical communication with the camshaft, and wherein the first and second finger drive arms are 180°

out of phase with each other;

(f) an array of permanent magnets fixedly attached to a top portion of the first and second finger drive arms, wherein the permanent magnets are configured for magnetic attachment to the multi-laminate membrane of a disposable cassette when attached thereto;

(g) a plurality of strain gauges disposed on a surface of each of the first and second pumping finger drive arms in contact with the multi-laminate membrane and configured to monitor fluid pressure within first and second pumping chambers of the disposable cassette when attached thereto; and

(h) a plurality of valve arms hingedly attached to the chassis, wherein a lower portion of each valve arm is in mechanical communication with one of the plurality of lobes on the camshaft and an upper portion of each valve arm is configured to respectively actuate each of the first and second inlet valves and the first and second outlet valves.

21. The pumping mechanism of claim 20, wherein the plurality of strain gauges comprises a first and a second strain gauge, each disposed on the surface of a respective pumping finger.

22. The pumping mechanism of claim 21, wherein the first and second strain gauges are disposed on the surface opposite to the attachment to the multi-laminate membrane of the disposable cassette when attached thereto.