The invention enables {HEAD ~ achievement} of control over the pressure in, and flow through, the surgical site, the detection of blood cells, red blood cells, haemoglobin and debris from the surgical site, the detection of blood lost from the surgical site, and control of the flow and pressure through the surgical site by use of signals from detectors detecting blood cells, red blood cells, {TAIL ~ haemoglobin} and debris from the surgical site 
The invention enables { HEAD ~ achievement } of control over the pressure in , and flow through , the surgical site , the detection of blood cells , red blood cells , haemoglobin and debris from the surgical site , the detection of blood lost from the surgical site , and control of the flow and pressure through the surgical site by use of signals from detectors detecting blood cells , red blood cells , { TAIL ~ haemoglobin } and debris from the surgical site
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD 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 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 OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH