Patent ID: 8591464

Claim:
A system for distending body tissue cavities of subjects by continuous flow irrigation during endoscopic procedures, the system comprising: a fluid source reservoir containing a non viscous physiologic fluid; a fluid supply conduit tube connecting the fluid source reservoir to an inlet end of a positive displacement inflow pump and an outlet end of the inflow pump being connectable to an inflow tube for pumping the fluid at a controlled flow rate into the cavity, the flow rate at which the fluid enters into the cavity via the inflow tube being termed as the cavity inflow rate; an inflow pressure pulsation dampening means connected to the inflow tube for dampening the pressure pulsations inside the cavity created by the positive displacement inflow pump; an outflow tube connectable to an inlet end of a positive displacement outflow pump for removing the fluid from the cavity at a controlled flow rate, the flow rate of the outflow pump being termed as the cavity outflow rate; an outflow pressure pulsation dampening means connected to the outflow tube for dampening the pressure pulsations inside the cavity created by the positive displacement outflow pump; an outlet end of the outflow pump connected to a waste fluid collecting container; and a tube having a fixed constriction site provided between the fluid source reservoir and the inflow tube such that the same by-passes the inflow pump, the constriction site having fixed diameter, wherein tube provides a route for any excess fluid being pumped by the inflow pump to bypass the inflow pump.