Patent ID: 7981073

Claim:
A pressure regulation method of an irrigation liquid at a surgical site in a body cavity ( 1 ), in which method an inflow liquid pump ( 2 ) pressurizes the irrigation liquid in a feed line ( 13 ) and in which an outflow device ( 3 ) drains the irrigation liquid from the body cavity ( 1 ) through a tubing ( 16 ) and in which a control unit ( 4 ) controls both the inflow liquid pump ( 2 ) and the outflow device ( 3 ) depending on an inflow irrigation liquid pressure from a pressure sensor ( 5 ), characterized in that the control unit ( 4 ) compares the inflow irrigation liquid pressure and flow values with pressures calculated to correspond to pressures in the body cavity for the respective flow, and that alignment between the pressure values is made by altering the effect of the inflow liquid pump ( 2 ) and/or the outflow liquid device ( 3 ), the method further characterized in that the inflow irrigation liquid pressure depends on detected and registered signals from optical sensors ( 21 , 22 ) provided at the tubing ( 16 ) on the outflow site of the body cavity ( 1 ), the optical sensors comprising a first optical sensor and a second optical sensor, the method further utilizing a debris identification module ( 25 ) for registering the amount of debris in the liquid coming out from the surgical site and a separate blood identification module ( 26 ) for registering the amount of blood cells, red blood cells, and/or haemoglobin, wherein each of the identification modules is provided for cooperation with one or both of the sensors ( 21 , 22 ), and wherein the method further comprises utilizing a second control unit ( 24 ) that increases the effect of the inflow and/or outflow liquid pump ( 3 a ) to rinse the surgical site until a level of clear vision in the module is reached so that the control unit ( 4 ) automatically increases the flow of the inflow irrigation liquid when the amount of debris is increased in the irrigation liquid in, or coming out of, the surgical site or regulates the pump so that the pressure of the irrigation liquid is increased when the amount of blood or haemoglobin is increased in or coming out of the surgical site.