Endoscopic surgical device, trocar, and sleeve

An overtube comprising:

• an overtube body that passes through a body wall and is inserted into a body cavity;
• an endoscope insertion passage that is provided inside the overtube body and allows an endoscope for observing the inside of the body cavity to be inserted therethrough so as to be movable forward and backward;
• a treatment tool insertion passage that is provided inside the overtube body and allows a treatment tool for inspecting or treating an affected part within the body cavity to be inserted therethrough so as to be movable forward and backward;
• and
• an interlocking member that is configured to be movable forward and backward inside the overtube body, has an endoscope-coupled part to be coupled to the endoscope inserted through the endoscope insertion passage and a treatment tool-coupled part to be coupled to the treatment tool inserted through the treatment tool insertion passage, and has a dead zone where the forward and backward movement of either one of the endoscope and the treatment tool does not interlock with the movement of the other and a sensing zone where the forward and backward movement of either one of the endoscope and the treatment tool interlocks with the movement of the other,
• wherein a contact surface of the overtube body with a body wall includes a rotation-preventing wall surface for preventing rotation in a rotational direction with an axial direction of the overtube body as a center.

An endoscopic surgical device comprising:

• an endoscope that observes the inside of a body cavity;
• a treatment tool that inspects or treats an affected part within the body cavity;
• an overtube that guides the endoscope and the treatment tool into the body cavity;
• and
• an exterior tube that fixes the overtube to an abdominal wall,
• wherein the overtube includes
• an overtube body that passes through a body wall and is inserted into the body cavity,
• an endoscope insertion passage that is provided inside the overtube body and allows the endoscope to be inserted therethrough so as to be movable forward and backward,
• a treatment tool insertion passage that is provided inside the overtube body and allows the treatment tool to be inserted therethrough so as to be movable forward and backward, and
• an interlocking member that is configured to be movable forward and backward inside the overtube body, has an endoscope-coupled part to be coupled to the endoscope inserted through the endoscope insertion passage and a treatment tool-coupled part to be coupled to the treatment tool inserted through the treatment tool insertion passage, and has a dead zone where the forward and backward movement of either one of the endoscope and the treatment tool does not interlock with the movement of the other and a sensing zone where the forward and backward movement of either one of the endoscope and the treatment tool interlocks with the movement of the other,
• wherein the exterior tube includes
• an insertion part that covers the portion of the overtube body that passes through the body wall,
• a base end part that is provided on a base end side of the insertion part and has a larger external diameter than that of the insertion part, and
• an airtight valve that is provided at the base end part and maintains the airtightness with the overtube body, and
• wherein a plurality of transverse grooves along a circumferential direction are formed in an axial direction in an outer peripheral surface of the insertion part, the transverse grooves have a distal end-side wall surface and a base-end-side wall surface, and an inclination angle of the distal end-side wall surface with respect to a radial direction of the insertion part is made smaller than an inclination angle of the base-end-side wall surface with respect to the radial direction of the insertion part.

An exterior tube that fixes an overtube to an abdominal wall, the overtube including

• an overtube body that passes through a body wall and is inserted into the body cavity,
• an endoscope insertion passage that is provided inside the overtube body and allows an endoscope for observing the inside of the body cavity to be inserted therethrough so as to be movable forward and backward,
• a treatment tool insertion passage that is provided inside the overtube body and allows a treatment tool for inspecting or treating an affected part within the body cavity to be inserted therethrough so as to be movable forward and backward, and
• an interlocking member that is configured to be movable forward and backward inside the overtube body, has an endoscope-coupled part to be coupled to the endoscope inserted through the endoscope insertion passage and a treatment tool-coupled part to be coupled to the treatment tool inserted through the treatment tool insertion passage, and has a dead zone where the forward and backward movement of either one of the endoscope and the treatment tool does not interlock with the movement of the other and a sensing zone where the forward and backward movement of either one of the endoscope and the treatment tool interlocks with the movement of the other,
• the exterior tube comprising:
• an insertion part that covers the portion of the overtube body that passes through the body wall;
• a base end part that is provided on a base end side of the insertion part and has a larger external diameter than that of the insertion part;
• and
• an airtight valve that is provided at the base end part and maintains the airtightness with the overtube body,
• wherein a plurality of transverse grooves along a circumferential direction are formed in an axial direction in an outer peripheral surface of the insertion part, the transverse grooves have a distal end-side wall surface and a base-end-side wall surface, and an inclination angle of the distal end-side wall surface with respect to a radial direction of the insertion part is made smaller than an inclination angle of the base-end-side wall surface with respect to the radial direction of the insertion part.