Endoscopic suction-irrigation instrument with insertable probe lockable in partially withdraw position

An endoscopic instrument comprising:

• a) a fluid chamber having proximal and distal ends;
• b) a hollow cannula coupled to the distal end of said fluid chamber, said hollow cannula having a distal end;
• c) a port means at said proximal end of said fluid chamber;
• d) a probe means having a first locking means on an outer surface thereof, said probe means extending through said port means, said fluid chamber, and said hollow cannula in a first fully inserted position, with a distal end of said probe means extending past said distal end of said cannula;
• e) a shell housing said fluid chamber and said port means;
• and
• f) a second automatic locking means housed by said shell, said second automatic locking means for automatically engaging said first locking means of said probe means when said probe means is partially withdrawn to a second position of said probe means where said distal end of said probe means is within said cannula, said second automatic locking means being releasable to allow said probe means to be fully withdrawn from said cannula.