A collection system for collecting outflow from a hysteroscopic surgical procedure, the collection system comprising: a surgical drape configured to collect liquid; a collection vessel; a vacuum source; characterized in that the system further comprises: a drape line connected between the surgical drape and the collection vessel, wherein a liquid flow path is defined from the surgical drape, through the drape line, and to the collection vessel; a vacuum line connected between the vacuum source and the collection vessel, the vacuum source configured to establish suction to draw liquid from the surgical drape along the liquid flow path; and - a filter assembly disposed along the liquid flow path, the filter assembly including a hydrophilic membrane configured to permit passage of liquid along the liquid flow path and impede passage of air along the along the liquid flow path, or - a valve assembly disposed along the liquid flow path, the valve assembly including a chamber defining an input configured to receive liquid flowing along the liquid flow path and an output configured to output fluid along the liquid flow path, the valve assembly including a buoyant float ball disposed within the chamber and configured to selectively open and close the output based upon a level of liquid the chamber, thereby inhibiting air from flowing out the output. a surgical drape configured to collect liquid; a collection vessel; a vacuum source; characterized in that the system further comprises: a drape line connected between the surgical drape and the collection vessel, wherein a liquid flow path is defined from the surgical drape, through the drape line, and to the collection vessel; a vacuum line connected between the vacuum source and the collection vessel, the vacuum source configured to establish suction to draw liquid from the surgical drape along the liquid flow path; and - a filter assembly disposed along the liquid flow path, the filter assembly including a hydrophilic membrane configured to permit passage of liquid along the liquid flow path and impede passage of air along the along the liquid flow path, or - a valve assembly disposed along the liquid flow path, the valve assembly including a chamber defining an input configured to receive liquid flowing along the liquid flow path and an output configured to output fluid along the liquid flow path, the valve assembly including a buoyant float ball disposed within the chamber and configured to selectively open and close the output based upon a level of liquid the chamber, thereby inhibiting air from flowing out the output. a drape line connected between the surgical drape and the collection vessel, wherein a liquid flow path is defined from the surgical drape, through the drape line, and to the collection vessel; a vacuum line connected between the vacuum source and the collection vessel, the vacuum source configured to establish suction to draw liquid from the surgical drape along the liquid flow path; and - a filter assembly disposed along the liquid flow path, the filter assembly including a hydrophilic membrane configured to permit passage of liquid along the liquid flow path and impede passage of air along the along the liquid flow path, or - a valve assembly disposed along the liquid flow path, the valve assembly including a chamber defining an input configured to receive liquid flowing along the liquid flow path and an output configured to output fluid along the liquid flow path, the valve assembly including a buoyant float ball disposed within the chamber and configured to selectively open and close the output based upon a level of liquid the chamber, thereby inhibiting air from flowing out the output. - a filter assembly disposed along the liquid flow path, the filter assembly including a hydrophilic membrane configured to permit passage of liquid along the liquid flow path and impede passage of air along the along the liquid flow path, or - a valve assembly disposed along the liquid flow path, the valve assembly including a chamber defining an input configured to receive liquid flowing along the liquid flow path and an output configured to output fluid along the liquid flow path, the valve assembly including a buoyant float ball disposed within the chamber and configured to selectively open and close the output based upon a level of liquid the chamber, thereby inhibiting air from flowing out the output.