wherein the tubing is provided with optical sensors configured to be at an outflow site of {TAIL ~ the body cavity} to identify an amount of blood cells, red blood cells, haemoglobin and debris in the irrigation liquid, and to give signals to a second control unit indicating {HEAD ~ the amount} of blood cells, red blood cells, haemoglobin and debris, 
wherein the tubing is provided with optical sensors configured to be at an outflow site of { TAIL ~ the body cavity } to identify an amount of blood cells , red blood cells , haemoglobin and debris in the irrigation liquid , and to give signals to a second control unit indicating { HEAD ~ the amount } of blood cells , red blood cells , haemoglobin and debris ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH