Stopcock Valve

• US 20070085049A1
• Filed: 11/14/2006
• Published: 04/19/2007
• Est. Priority Date: 08/22/1997
• Status: Abandoned Application

• Current Assignee: DEKA Research & Development
• Original Assignee: DEKA Research & Development
• Inventors: Larkins, William, Houle, Philip
• Application Number:
  US11/559,792
• Publication Number:
  US 20070085049A1
• Time in Patent Office: Days
• US Class Current: 251/309
• CPC Class Codes: A61M 2005/1402 Priming
• CPC Class Codes: A61M 2005/1403 Flushing or purging
• CPC Class Codes: A61M 2005/14208 with a programmable infusion control system, characterised by the infusion program
• CPC Class Codes: A61M 2205/123 with incorporated reservoirs
• CPC Class Codes: A61M 2205/128 with incorporated valves
• CPC Class Codes: A61M 2205/35 Communication
• CPC Class Codes: A61M 2205/8206 battery-operated
• CPC Class Codes: A61M 2206/22 eliminating pulsatile flows, e.g. by the provision of a dampening chamber
• CPC Class Codes: A61M 39/24 Check- or non-return valves
• CPC Class Codes: A61M 5/1409 in series, e.g. first substance passing through container holding second substance, e.g. reconstitution systems needle sets A61M5/162
• CPC Class Codes: A61M 5/1413 Modular systems comprising interconnecting elements
• CPC Class Codes: A61M 5/142 Pressure infusion, e.g. using pumps
• CPC Class Codes: A61M 5/14224 Diaphragm type
• CPC Class Codes: A61M 5/16809 by repeated filling and emptying of an intermediate volume pressure infusion using positive displacement pumps A61M5/142
• CPC Class Codes: A61M 5/16827 controlling delivery of multiple fluids, e.g. sequencing, mixing or via separate flow-paths infusion of multiple fluids without using a controller A61M5/1407
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066
• CPC Class Codes: A61M 5/16854 by monitoring line pressure
• CPC Class Codes: A61M 5/16877 Adjusting flow; Devices for setting a flow rate
• CPC Class Codes: A61M 5/365 Air detectors A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626
• CPC Class Codes: A61M 5/5086 for indicating if defective, used, tampered with or unsterile
• CPC Class Codes: F16K 5/0414 : Plug channel at 90 degrees to the inlet
• CPC Class Codes: F16K 5/0478 : on the plug

Abstract

A cassette for controlling the flow of IV fluid from a patient to a source. The cassette preferably includes, along the fluid passage through the cassette, first and second membrane-based valves on either side of a pressure-conduction chamber, and a stopcock-type valve. The stopcock valve is preferably located downstream of the second membrane-based valve, which is preferably located downstream of the pressure-conduction chamber. The stopcock control valve preferably has two rigid cylindrical members with complementary surfaces, wherein one member includes a tapered groove defined on its complementary surface. The two complementary surfaces define a space therebetween, instead of having an interference fit, and a resilient sealing member is disposed in this space. When the first and second rigid members are in an open position with respect to each other, the sealing member defines an aperture through which fluid communication is provided between the fluid-path portions defined respectively by the two rigid members. When the first and second rigid members are in the closed position with respect to each other, the sealing member provides a seal preventing flow between the fluid-path portions. The membrane defining the valving chamber of the second membrane-based valve is preferably large and resilient, so that the valving chamber may provide a supply of pressurized intravenous fluid to the patient, when the valve is closed and the stopcock valve provides a restriction downstream of the valve. The pressure-conduction chamber preferably has a membrane that is stable in the empty-chamber position but relatively unstable in the filled-chamber position.

Claims

1. A stopcock control valve comprising:

a first rigid member having a first surface, the first rigid member defining a first fluid-path portion with a first terminus at the first surface;

a second rigid member having a second surface, the second rigid member defining a second fluid-path portion with a second terminus at the second surface,

wherein the first terminus includes a groove defined on the first surface, the groove tapering from a large cross-sectional area to a small cross-sectional area,

wherein the first and second rigid members are capable of being rotated with respect to each other from a fully open position continuously through partially open positions to a closed position, and

wherein the first and second surfaces define a space therebetween;

an aperture in the second rigid member through which fluid communication is provided between the first and second fluid-path portions when the first and second rigid members are in the fully open position or in one of the partially open positions with respect to each other, wherein fluid flowing between the first and second fluid-path portions flows through the groove as well as the aperture; and

a sealing means disposed between the first and second surfaces to provide a seal between the first and second rigid members for preventing fluid from leaking out of the space.

2. A valve according to claim 1, wherein the groove, when the first and second members are in one of the partially open positions with respect to each other, extends beyond a diameter of the aperture.

3. A valve according to claim 1, wherein the first and second surfaces are circumferential cylindrical surfaces which may be rotated with respect to each other.

4. A valve according to claim 3, wherein the first rigid member is a cylinder and the first surface is an outer circumferential surface of the cylinder, the second rigid member defines a cylindrical hollow area for receiving the first rigid member and the second surface is an inner circumferential surface of the second rigid member.

5. A valve according to claim 4, wherein the sealing means includes an O-ring made of resilient material.

6. A valve according to claim 5, further comprising a second sealing means, wherein the second sealing means includes an O-ring made of resilient material disposed around an outer circumference of the second rigid member.

7. A valve according to claim 1, wherein the first member is connected to a control knob for rotating the first rigid member.

8. A valve according to claim 1, wherein the sealing means includes an O-ring made of resilient material.

9. A valve according to claim 1, wherein the second rigid member includes a third surface, the valve further comprising a second sealing means disposed on the third surface of the second rigid member.

10. A stopcock control valve comprising:

a first rigid member having a first surface, the first rigid member defining a first fluid-path portion with a first terminus at the first surface;

a second rigid member having a second surface, the second rigid member defining a second fluid-path portion with a second terminus at the second surface,

wherein the first terminus includes a groove defined on the first surface, the groove tapering from a large cross-sectional area to a small cross-sectional area,

wherein the first and second rigid members are capable of being rotated with respect to each other from a fully open position continuously through partially open positions to a closed position, and

wherein the first and second surfaces define a space therebetween;

an aperture in the second rigid member through which fluid communication is provided between the first and second fluid-path portions when the first and second rigid members are in the fully open position or in one of the partially open positions with respect to each other, wherein fluid flowing between the first and second fluid-path portions flows through the groove as well as the aperture; and

a seal disposed between the first and second surfaces for preventing fluid from leaking out of the space between the first and second rigid members.

11. A valve according to claim 10, wherein the groove, when the first and second members are in one of the partially open positions with respect to each other, extends beyond a diameter of the aperture.

12. A valve according to claim 10, wherein the first and second surfaces are circumferential cylindrical surfaces which may be rotated with respect to each other.

13. A valve according to claim 12, wherein the first rigid member is a cylinder and the first surface is an outer circumferential surface of the cylinder, the second rigid member defines a cylindrical hollow area for receiving the first rigid member and the second surface is an inner circumferential surface of the second rigid member.

14. A valve according to claim 13, wherein the seal includes an O-ring made of resilient material.

15. A valve according to claim 14, further comprising a second seal, wherein the second seal includes an O-ring made of resilient material disposed around an outer circumference of the second rigid member.

16. A valve according to claim 10, wherein the first member is connected to a control knob for rotating the first rigid member.

17. A valve according to claim 10, wherein the seal includes an O-ring made of resilient material.

18. A valve according to claim 10, wherein the second rigid member includes a third surface, the valve further comprising a second seal disposed on the third surface of the second rigid member.

19. A stopcock control valve comprising:

a valve seat member defining a hollow area, said valve seat member having an aperture;

a rigid member having an outer circumferential surface, wherein said outer circumferential surface having a groove defined thereon, said groove tapering from a large volume to a small volume, wherein said rigid member rotatably fits within said hollow area of said valve seat member; and

two o-rings on said valve seat member.

20. A valve according to claim 19, wherein said o-rings comprising molded-over resilient material.