Endoscopic instrument and endoscopic instrument system

An endoscopic instrument system comprising:

• an endoscopic instrument which includes:
• an elongate tube having an axially continuous and substantially cylindrical main lumen configured to receive a shaft of an endoscope lens system, and
• a tool, which is arranged at a distal end of the tube and is connected to a distal end region of the tube, the tool having at least one movable tool element, and
• an elongate transmission element, the tool being controllable via the transmission element from a proximal end of the tube, the transmission element being a pull rod or pull wire, the tool element being movable about a transverse stub by the pull rod or pull wire, the transverse stub being connected to the distal end region of the tube by a holder,
• the tube having an axially continuous secondary lumen, which is joined next to the main lumen in a direction transverse to a longitudinal axis of the tube, opens into the main lumen via a narrowed transition area, and receives the transmission element, the secondary lumen having a smaller cross-sectional area than the main lumen,
• the narrowed transition area being narrower than a corresponding transverse dimension of the pull rod or pull wire,
• the transition area providing passage between the main lumen and the secondary lumen,
• the pull rod or pull wire is disposed in the secondary lumen;
• and
• a rigid endoscope lens system configured to be inserted into the main lumen of the tube of the endoscopic instrument.

An endoscopic instrument comprising:

• a proximal end and a distal end;
• a handle at the proximal end;
• an elongate tube extending from the distal end to the handle, the tube having a cavity which extends along a longitudinal axis of the tube, the cavity being formed by a main lumen, a secondary lumen, and a transition area between the main lumen and the secondary lumen, the transition area comprising a constriction in a wall of the tube and providing passage between the main lumen and the secondary lumen, the secondary lumen having a smaller cross-sectional area than the main lumen, the tube being designed with a substantially uniform wall thickness;
• a tool arranged at a distal end of the tube and connected to a distal end region of the tube, the tool having at least one movable tool element;
• an elongate transmission element connected to the tool, wherein the tool is controlled by the handle via the transmission element, the transmission element being a pull rod or pull wire, the tool element being movable about a transverse stub by the pull rod or pull wire, the transverse stub being connected to the distal end region of the tube by a holder, the pull rod or pull wire being disposed in the secondary lumen;
• a latch disposed at a proximal end region of the tube, the latch being configured to lock an endoscope lens system to the tube when a shaft of the endoscope lens system is received in the main lumen;
• wherein the transition area is narrower than a corresponding transverse dimension of the pull rod or pull wire;
• wherein the latch includes an irrigation attachment piece which provide fluids connection to an irrigation machine to introduce a liquid into the main lumen and the secondary lumen.