A surgical
system 20 for performing a surgical procedure at a
surgical site of a spine of a patient is provided. The surgical
system 20 comprises a
retractor 22 having a proximal end 27, a distal end 26, an inner surface 23, outer surface 24, and a central axis 25 extending between the distal end 26 and the proximal end 27, in which the distal end 26 is configured to be positioned within the patient to provide a working channel 28 to the
surgical site 21 and the proximal end 27 defines an opening 29 open to ambient. The surgical
system 20 further comprises an inflow source 31 coupled to the
retractor 22 for providing a fluid 41 to the
surgical site 21 to form a volume of fluid 41 disposed in the surgical site 21 and the
retractor 22, an outflow source 32 configured to be in fluid communication with a
surgical instrument for removing a volume of fluid from the surgical site 21, a
fluid level sensor 33 coupled to the retractor 22 for providing a
fluid level sensor input
signal based on a level of fluid 41 disposed in the retractor 22, and a controller 43 in communication with the
fluid level sensor 33 and the inflow source 31, and not in communication with the outflow source 32, the controller 43 configured to control a flow rate of fluid 41 being provided by the inflow source 31 to compensate for sensed changes due to operation of the outflow source 32 such that a threshold level 48 of fluid 41 is maintained in the retractor 22.