Fluid reservoir and associated fluid circulation system and method

A fluid circulation system for supplying working fluid to and returning working fluid from a fluid management device, the fluid circulation system comprising:

• a supply reservoir comprising a supply membrane separating a supply working fluid chamber, containing a portion of working fluid, and a supply gas chamber, containing a pressurized gas at a first pressure, wherein the supply reservoir further comprises a supply-bleed port and a supply-bleed channel, the supply-bleed port being fluidically coupled with the supply-bleed channel, which is in fluidic communication with the supply working fluid chamber;
• a return reservoir comprising a return membrane separating a return working fluid chamber, containing a portion of working fluid, and a return gas chamber, containing a pressurized gas at a second pressure, wherein the return reservoir further comprises a return-bleed port and a return-bleed channel, the return-bleed port being fluidically coupled with the return-bleed channel, which is in fluidic communication with the return working fluid chamber;
• and
• a bulk reservoir comprising a bulk working fluid chamber with a free surface;
• wherein:
• the supply-bleed channel is configured to bleed gas within the supply working fluid chamber to the bulk reservoir;
• the return-bleed channel is configured to bleed gas within the return working fluid chamber indirectly to the bulk reservoir, via the supply working fluid chamber;
• the supply reservoir and the return reservoir are independently and selectively rotatable into any one of various rotational orientations, relative to the bulk reservoir;
• the supply reservoir is configured to receive a portion of working fluid to the supply working fluid chamber from the return working fluid chamber and further configured to supply a portion of working fluid from the supply working fluid chamber to the fluid management device;
• and
• the return reservoir is configured to receive a portion of working fluid from the fluid management device into the return working fluid chamber and further configured to supply a portion of working fluid from the return working fluid chamber to the supply working fluid chamber.

A method for removing gas from working fluid within a reservoir, the method comprising:

• pressurizing a portion of working fluid within a working fluid chamber of the reservoir by pressurizing a pressurized gas within a gas chamber of the reservoir at a constant pressure, wherein the working fluid chamber and the gas chamber are separated by a membrane;
• receiving a portion of working fluid into the working fluid chamber and removing a portion of working fluid from the working fluid chamber;
• selectively rotating the reservoir, relative to a bulk reservoir, wherein the bulk reservoir is in fluidic communication with the working fluid chamber of the reservoir;
• and
• when the reservoir is selectively rotating, bleeding gas within the working fluid chamber to the bulk reservoir, through a bleed port fluidically coupled to a bleed channel that is in fluidic communication with the working fluid chamber of the reservoir.