Endoscopic surgical instrument

An endoscopic surgical instrument comprising:

• a) a single access conduit having one end configured as a probe connector for attaching a surgical probe thereto, and having a port for insertion of surgical instrumentation at an opposite end;
• and
• b) a pistol grip extending from said single access conduit, said pistol grip including
• i) an irrigation input means for receiving irrigation fluid,
• ii) an evacuation output means for expelling fluid and body tissue,
• iii) a central conduit for passage of fluids to said single access conduit from said pistol grip, and for passing fluids and body tissue from said single access conduit to said pistol grip,
• iv) valve means for operator selectable connection of said irrigation input means to said central conduit, and for operator selectable connection of said evacuation output means to said central conduit, and
• wherein said valve means includes first and second valve bores extending into said pistol grip from an exterior surface, each said valve bore having a bore diameter and a bore depth, said bore diameter of said first valve bore having a first opening in said bore diameter at a first depth in said first bore from said exterior surface for providing fluid access to said central conduit, and a second opening diametrically opposite said first opening leading to a first conduit, and a third opening located at a second depth in said first bore, leading to a second fluid conduit, and said second bore having a first opening at said first depth, leading to a third fluid conduit, and having a second opening in said bore diameter located at said second depth leading to said first fluid conduit making fluid interconnection with said second opening of said first bore, and said valve means further having first and second valve assemblies for insertion in said first and second bores, each of said valve assemblies having a cylindrical body having a valve diameter dimensioned for a sliding fit in said bore diameter, and having an opening on one end of said body to an elongated chamber within said cylindrical body, said body having first and second diametrically opposed openings into said chamber at said first depth from said opening, and having third and fourth diametrically opposed openings at said second depth, and said valve assembly having a spring loaded plunger activated valve means located between said first depth and said second depth inside said chamber for selectably sealing or connecting a lower first chamber portion accessed by said first and second openings, from a second chamber portion accessed by said third and fourth openings, and said plunger activated valve means having a plunger rod extending from outside said body, having an O-ring seal means sealing said opening around said plunger rod, and said assembly having O-ring seal means for sealing said valve diameter to said bore diameter, said O-rings located before said second depth and between said second depth and said first depth, and after said first depth.