Apparatus for irrigating a body cavity with a liquid
An apparatus for irrigating a body cavity with a liquid comprises an irrigation pump and, associated therewith, an irrigation conduit leading to the body cavity for feeding the liquid into the body cavity, and at least one suction conduit leading away from the body cavity and, associated therewith, a suction pump for drawing off the liquid from the body cavity, and a control circuit, which controls the irrigation pump and the suction pump such that the liquid passes through the body cavity substantially with a predetermined nominal pressure and a predetermined nominal flow rate. The control circuit controls the irrigation pump as a function of the nominal flow rate, while it controls the suction pump as a function of the nominal pressure.
1. An apparatus for irrigating a body cavity with a liquid, comprising an irrigation pump and, associated therewith, an irrigation conduit leading to the body cavity for feeding the liquid into the body cavity, and at least one suction conduit leading away from the body cavity and, associated therewith, a suction pump for drawing off the liquid from the body cavity, and a control circuit, which controls the irrigation pump and the suction pump such that the liquid passes through the body cavity substantially with a nominal pressure and a nominal flow rate, where the control circuit controls the irrigation pump as a function of the nominal flow rate, while it controls the suction pump as a function of the nominal pressure; and
wherein the control circuit controls the irrigation pump as a function of the suction power of the suction pump such that the power of the irrigation pump is reduced when the suction power of the suction pump is increased, at least when the suction power of the suction pump exceeds a predetermined threshold value.
2. The apparatus of claim 1 , characterized in that a pressure sensor is associated with the irrigation conduit for determining the actual pressure, and the control circuit controls the suction pump as a function of the actual pressure determined by the pressure sensor for maintaining the nominal pressure.
3. The apparatus of claim 1 , characterized in that the irrigation pump and the suction pump are displacement pumps.
4. The apparatus of claim 3 , characterized in that the irrigation pump is a roller pump or a gear pump.
5. The apparatus of claim 3 , characterized in that the suction pump is a roller pump.
6. The apparatus of anyone of claim 1 , characterized in that the irrigation pump is a centrifugal pump.
7. The apparatus of claim 1 , characterized in that at least two parallel suction conduits lead away from the body cavity, wherein the suction pump is associated with both suction conduits, wherein further one suction conduit is connected with a working instrument, and wherein it can be switched over between both suction conduits as a function of the operating condition of the working instrument.
8. An apparatus for irrigating a body cavity with a liquid, comprising an irrigation pump and, associated therewith, an irrigation conduit leading to the body cavity for feeding the liquid into the body cavity, and at least one suction conduit leading away from the body cavity and, associated therewith, a suction pump for drawing off the liquid from the body cavity, and a control circuit, which controls the irrigation pump and the suction pump such that the liquid passes through the body cavity substantially with a nominal pressure and a nominal flow rate, where the control circuit controls the irrigation pump as a function of the nominal flow rate, while it controls the suction pump as a function of the nominal pressure; and
wherein the control circuit uses the speed of the suction pump as a control signal and controls the irrigation pump as a function of said control signal.
9. The apparatus of claim 8 , characterized in that the control circuit controls the irrigation pump as a function of the speed of the suction pump, at least when a flow rate threshold value is exceeded, such that the speed of the irrigation pump is reduced when the speed of the suction pump increases.
10. An apparatus for irrigating a body cavity with a liquid, comprising an irrigation pump and, associated therewith, an irrigation conduit leading to the body cavity for feeding the liquid into the body cavity, and at least one suction conduit leading away from the body cavity and, associated therewith, a suction pump for drawing off the liquid from the body cavity, and a control circuit, which controls the irrigation pump and the suction pump such that the liquid passes through the body cavity substantially with a nominal pressure and a nominal flow rate, where the control circuit controls the irrigation pump as a function of the nominal flow rate, while it controls the suction pump as a function of the nominal pressure; and
wherein the control circuit controls the irrigation pump as a function of the difference between the speeds of the irrigation pump and the suction pump.
11. The apparatus of claim 10 , wherein the irrigation pump and the suction pump are displacement pumps.
12. An apparatus for irrigating a body cavity with a liquid, comprising an irrigation pump and, associated therewith, an irrigation conduit leading to the body cavity for feeding the liquid into the body cavity, and at least one suction conduit leading away from the body cavity and, associated therewith, a suction pump for drawing off the liquid from the body cavity, and a control circuit, which controls the irrigation pump and the suction pump such that the liquid passes through the body cavity substantially with a nominal pressure and a nominal flow rate, where the control circuit controls the irrigation pump as a function of the nominal flow rate, while it controls the suction pump as a function of the nominal pressure; and
wherein the control circuit controls the irrigation pump as a function of at least two different nominal flow rates (Q 1 , Q 2 ).
13. The apparatus of claim 12 , characterized in that the control circuit switches over the irrigation pump between the at least two nominal flow rates (Q 1 , Q 2 ) as a function of the operating condition of a working instrument connected with the control circuit.
14. The apparatus of claim 12 , wherein the irrigation pump and the suction pump are displacement pumps.
15. An apparatus for irrigating a body cavity with a liquid, comprising an irrigation pump and, associated therewith, an irrigation conduit leading to the body cavity for feeding the liquid into the body cavity, and at least one suction conduit leading away from the body cavity and, associated therewith, a suction pump for drawing off the liquid from the body cavity, and a control circuit, which controls the irrigation pump and the suction pump such that the liquid passes through the body cavity substantially with a nominal pressure and a nominal flow rate, where the control circuit controls the irrigation pump as a function of the nominal flow rate, while it controls the suction pump as a function of the nominal pressure; and
wherein the control circuit determines the difference between the speeds of the suction pump and the irrigation pump.
16. The apparatus of claim 15 , wherein the irrigation pump and the suction pump are displacement pumps.