Surgical apparatus

Surgical apparatus comprising:

• an elongated cannula including at least one lumen extending therein between distal and proximal ends;
• a housing attached to the cannula near the proximal end thereof including a passage therethrough for receiving therein an endoscope disposed within the one lumen to extend out of the housing, the housing including a hook-shaped clamping segment disposed to engage a lateral member of an endoscope at a location thereon extended out of the proximal end of the cannula, the clamping segment being formed of flexible, resilient material in said hook shape that angularly traverses less than π radians to facilitate deflection thereof out of clamping engagement about a lateral member of an endoscope in response to rotational movement of the housing relative to the lateral member of an endoscope disposed to extend from the housing.

Surgical apparatus comprising:

• an elongated cannula including at least one lumen extending between distal and proximal ends in eccentric orientation within the cannula for receiving an endoscope therein;
• and
• a tissue-dissecting blunt tip having a cylindrical segment for attachment to the distal end of the cannula, the tip having a forward conical segment axially aligned with the eccentric orientation of the one lumen, and having an intermediate segment having exterior walls tapering between the cylindrical segment and the forward conical segment, at least the forward conical segment including transparent exterior walls that permit visualization therethrough by an endoscope within the one lumen.

Surgical apparatus comprising:

• an elongated cannula including a lumen extending between distal and proximal ends within the cannula for receiving an endoscopic therein;
• and
• a tissue-dissecting blunt tip disposed at the distal end of the cannula having transparent walls tapering toward a distal blunt tip for permitting visualization therethrough by an endoscope within the lumen of tissue in contact with the exterior walls, the walls of the tip including coloration within the yellow to green spectral range for enhancing visual distinctions between types of tissues that contact the exterior walls of the tip.