Fluid management system

• US 5,882,339 A
• Filed: 06/07/1995
• Issued: 03/16/1999
• Est. Priority Date: 08/21/1991
• Status: Expired due to Term

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Inventors: Beiser, David G., Krause, Kenneth W., Woolfson, Steven B.
• Primary Examiner(s): Buiz, Michael Powell
• Assistant Examiner(s): Woo, Julian W.
• Application Number:
  US08/486,608
• Time in Patent Office: 1,378 Days
• Field of Search: 604/66, 604/118, 604/151, 604/153, 604/131
• US Class Current: 604/153
• CPC Class Codes: A61B 1/00135 Oversleeves mounted on the endoscope prior to insertion
• CPC Class Codes: A61B 1/12 with cooling or rinsing arrangements
• CPC Class Codes: A61B 17/00234 for minimally invasive surgery A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/320016 Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes A61B10/0233, A61B17/29, A61B17/3207 take precedence
• CPC Class Codes: A61B 17/3421 Cannulas
• CPC Class Codes: A61M 1/72 Cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 1/77 Suction-irrigation systems aspiration tips supplying fluids A61M1/85; specific for negative pressure wound therapy A61M1/92; combined with tracheal tubes A61M16/0463
• 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 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 3/0201 Cassettes therefor
• CPC Class Codes: A61M 3/0202 with electronic control means or interfaces
• CPC Class Codes: A61M 3/0216 Pressure
• CPC Class Codes: A61M 3/022 Volume; Flow rate
• CPC Class Codes: A61M 3/0258 by means of electric pumps
• CPC Class Codes: Y10S 128/13 Infusion monitoring

Abstract

Apparatus for supplying liquid to a body cavity during an endoscopic procedure includes a feedback loop-controlled liquid supply device inherently capable of supplying liquid at a substantially constant pressure substantially independent of the flow rate of liquid delivered by the liquid supply device within a relatively wide range of flow rate. Also disclosed are a disposable plastic pump cassette having an inflow pump in a housing, and an operative cannula. The surgical procedure is performed with continuous control over the body cavity pressure, regardless of the outflow flow rate.

Claims

1. A disposable plastic pump cassette for use in an endoscopic surgical procedure, comprising a housing;

an inflow pump means in said housing for supplying liquid under pressure to a body cavity during the endoscopic procedure, and inlet and outlet conduit means within said housing for supplying liquid to and delivering liquid under pressure from said inflow pump means; and

a chamber in said housing having an open end, a thin, flexible diaphragm closing said open end, and channel means in said outlet conduit means for directing liquid delivered from said pump means to said chamber.

2. Apparatus according to claim 1, wherein said inflow pump means is a dynamic pump means.

3. Apparatus according to claim 2, wherein said dynamic pump means is a centrifugal pump.

4. Apparatus according to claim 3, wherein said inflow pump means comprises coupling means for non-contact coupling of said inflow pump means to a motor externally of said housing.

5. Apparatus according to claim 4, wherein said coupling means is means for magnetically coupling said inflow pump means to said motor.

6. A disposable plastic pump cassette for use in an endoscopic surgical procedure, comprising a housing;

an inflow pump means in said housing for supplying liquid under pressure to a body cavity during the endoscopic procedure, and inlet and outlet conduit means within said housing for supplying liquid to and delivering liquid under pressure from said inflow pump means; and

pressure-sensing means in said housing for sensing a pressure of a liquid, and channel means in said outlet conduit means for directing liquid delivered from said pump means to said pressure-sensing means.

7. Apparatus according to claim 6, wherein said inflow pump means is a dynamic pump means.

8. Apparatus according to claim 7, wherein said dynamic pump means is a centrifugal pump.

9. Apparatus according to claim 8, wherein said inflow pump means comprises coupling means for non-contact coupling of said inflow pump means to a motor externally of said housing.

10. Apparatus according to claim 9, wherein said coupling means is means for magnetically coupling said inflow pump means to said motor.

16. Apparatus according to claim 6, wherein:

said inflow pump means comprises an inflow pump;

said inlet and outlet conduit means respectively comprise an inlet conduit and an outlet conduit;

said pressure-sensing means comprises a pressure sensor; and

said channel means in said outlet conduit means includes a channel for directing liquid delivered from said pump to said pressure sensor.

17. Apparatus according to claim 16, wherein said inflow pump comprises a dynamic pump.

18. Apparatus according to claim 17, wherein said dynamic pump comprises a centrifugal pump.

19. Apparatus according to claim 18, wherein said inflow pump comprises a coupling providing non-contact coupling of said inflow pump to a motor externally of said housing.

20. Apparatus according to claim 19, wherein said coupling comprises a magnetic coupling.

11. A disposable plastic pump cassette for use in an endoscopic surgical procedure, comprising:

a housing;

an inflow pump in said housing for supplying liquid under pressure to a body cavity during the endoscopic procedure;

inlet and outlet conduits within said housing for respectively supplying liquid to and delivering liquid under pressure from said inflow pump; and

a chamber in said housing having an open end, a thin, flexible diaphragm closing said open end, wherein said outlet conduit includes a channel for directing liquid delivered from said pump to said chamber.

12. Apparatus according to claim 11, wherein said inflow pump comprises a dynamic pump.

13. Apparatus according to claim 12, wherein said dynamic pump comprises a centrifugal pump.

14. Apparatus according to claim 12, wherein said inflow pump comprises a coupling providing non-contact coupling of said inflow pump to a motor externally of said housing.

15. Apparatus according to claim 14, wherein said coupling comprises a magnetic coupling.