Surgery system

1. A surgery system comprising:

an overtube that has a distal end, a proximal end, and a longitudinal axis and holds a treatment tool and an endoscope so as to be movable forward and backward in a direction of the longitudinal axis, the overtube having

an endoscope holding part that has an endoscope holding surface for holding the endoscope and allowing circumferential rotation of the endoscope about a central axis of the endoscope, and

a treatment tool holding part that has a treatment tool holding surface for holding the treatment tool; and

the endoscope that is inserted into the overtube and has a held surface held by the endoscope holding surface, the endoscope having a biasing member that maintains the circumferential orientation of the endoscope even in a case where the overtube rotates around the longitudinal axis, wherein the biasing member has an outer surface,

wherein the biasing member generates a rotational moment around the central axis of the endoscope in a case where the overtube has rotated around the longitudinal axis, and maintains the circumferential orientation of the endoscope using the rotational moment generated in the biasing member,

wherein the overtube has a movable body that is movable in a direction of the longitudinal axis, and the endoscope holding part and the treatment tool holding part are provided at the movable body,

wherein the movable body has a distal-end-side restricting part that restricts movement of the endoscope holding part on a distal end side of the movable body, and a proximal-end-side restricting part that restricts movement of the endoscope holding part on a proximal end side of the movable body, and the endoscope holding part is movable between the distal-end-side restricting part and the proximal-end-side restricting part.

2. The surgery system according to claim 1 ,

wherein the biasing member biases a circumferential position of the endoscope to a fixed position.

3. The surgery system according to claim 2 ,

wherein the biasing member has a gravity center position at a position eccentric from the central axis of the endoscope.

4. The surgery system according to claim 2 ,

wherein the endoscope has a rigid insertion part inserted into the overtube, a flexible cord part provided on a proximal end side of the insertion part, a connecting part connecting the insertion part and the cord part to each other, and at least a portion of the connecting part is provided obliquely with respect to a central axis of the insertion part of the endoscope, and

wherein the biasing member has the connecting part and the cord part, and generates the rotational moment around the central axis of the endoscope with the connecting part and the cord part in a case where the overtube has rotated around the longitudinal axis.

5. The surgery system according to claim 2 ,

wherein the biasing member is provided inside the endoscope, and biases the circumferential position of the endoscope to a fixed position using a weight of the biasing member.

6. The surgery system according to claim 1 ,

wherein the endoscope has a gravity center position at a position eccentric from the central axis of the endoscope, and

wherein the biasing member generates the rotational moment, resulting from gravity, about the central axis at the gravity center position of the endoscope.

7. The surgery system according to claim 1 ,

wherein the movable body has a region where the forward and backward movement of either the endoscope or the treatment tool does not interlock with the forward and backward movement of the other and a region where the forward and backward movement of either the endoscope or the treatment tool interlocks with the forward and backward movement of the other.

8. The surgery system according to claim 1 ,

wherein the movable body is movable inside the overtube, and

wherein the movable body has an endoscope locking part to which the endoscope holding part is locked, and a treatment tool locking part to which the treatment tool holding part is locked.

9. The surgery system according to claim 1 , further comprising:

an outer sheath that has a distal end opening and a proximal end opening and has an insertion passage through which the overtube is inserted from the proximal end opening so as to be rotatable around the longitudinal axis.

10. A surgery system comprising:

an overtube that has a distal end, a proximal end, and a longitudinal axis and holds a treatment tool and an endoscope so as to be movable forward and backward in a direction of the longitudinal axis, the overtube having

an endoscope holding part that has an endoscope holding surface for holding the endoscope, and

a treatment tool holding part that has a treatment tool holding surface for holding the treatment tool; and

the endoscope that is inserted into the overtube and has a held surface held by the endoscope holding surface, the endoscope having a biasing member that generates a rotational moment around a central axis of the endoscope in a case where the overtube has rotated around the longitudinal axis, wherein the biasing member has an outer surface,

wherein the rotational moment generated in the biasing member is greater than a friction moment, about the central axis of the endoscope, resulting from a frictional force between the endoscope holding surface and the held surface,

wherein the overtube has a movable body that is movable in a direction of the longitudinal axis, and the endoscope holding part and the treatment tool holding part are provided at the movable body,

wherein the movable body has a distal-end-side restricting part that restricts movement of the endoscope holding part on a distal end side of the movable body, and a proximal-end-side restricting part that restricts movement of the endoscope holding part on a proximal end side of the movable body, and the endoscope holding part is movable between the distal-end-side restricting part and the proximal-end-side restricting part.

11. The surgery system according to claim 10 ,

wherein the biasing member biases a circumferential position of the endoscope about the central axis of the endoscope to a fixed position.

12. The surgery system according to claim 10 ,

wherein the movable body is movable inside the overtube, and

wherein the movable body has an endoscope locking part to which the endoscope holding part is locked, and a treatment tool locking part to which the treatment tool holding part is locked.

13. The surgery system according to claim 12 ,

wherein the movable body has a region where the forward and backward movement of either the endoscope or the treatment tool does not interlock with the forward and backward movement of the other and a region where the forward and backward movement of either the endoscope or the treatment tool interlocks with the forward and backward movement of the other.

14. A surgery system comprising:

an overtube that has a distal end, a proximal end, and a longitudinal axis and holds a treatment tool and an endoscope so as to be movable forward and backward in a direction of the longitudinal axis, the overtube having

an endoscope holding part that has an endoscope holding surface for holding the endoscope, and

a treatment tool holding part that has a treatment tool holding surface for holding the treatment tool; and

the endoscope that is inserted into the overtube and has a held surface held by the endoscope holding surface, the endoscope having a gravity center position at a position deviating from a central axis of the endoscope,

wherein a rotational moment, resulting from gravity, about the central axis in the gravity center position of the endoscope is greater than a friction moment, about the central axis, resulting from a frictional force between the endoscope holding surface and the held surface,

wherein the overtube has a movable body that is movable in a direction of the longitudinal axis, and the endoscope holding part and the treatment tool holding part are provided at the movable body,

wherein the movable body has a distal-end-side restricting part that restricts movement of the endoscope holding part on a distal end side of the movable body, and a proximal-end-side restricting part that restricts movement of the endoscope holding part on a proximal end side of the movable body, and the endoscope holding part is movable between the distal-end-side restricting part and the proximal-end-side restricting part.

15. The surgery system according to claim 14 ,

wherein the movable body is movable inside the overtube, and

wherein the movable body has an endoscope locking part to which the endoscope holding part is locked, and a treatment tool locking part to which the treatment tool holding part is locked.

16. The surgery system according to claim 15 ,

wherein the movable body has a region where the forward and backward movement of either the endoscope or the treatment tool does not interlock with the forward and backward movement of the other and a region where the forward and backward movement of either the endoscope or the treatment tool interlocks with the forward and backward movement of the other.

17. The surgery system according to claim 14 , further comprising:

an outer sheath that has a distal end opening and a proximal end opening and has an insertion passage through which the overtube is inserted from the proximal end opening so as to be rotatable around the longitudinal axis.

18. A surgery system comprising:

an overtube that has a distal end, a proximal end, and a longitudinal axis and holds a treatment tool and an endoscope so as to be movable forward and backward in a direction of the longitudinal axis, the overtube having

an endoscope holding part that has an endoscope holding surface for holding the endoscope and allowing circumferential rotation of the endoscope about a central axis of the endoscope, and

a treatment tool holding part that has a treatment tool holding surface for holding the treatment tool; and

the endoscope that is inserted into the overtube, the endoscope having an insertion part that has a distal end, a proximal end, and a central axis in a direction of the longitudinal axis, a cord part provided on a proximal end side of the insertion part, a connecting part that connects the insertion part and the cord part to each other, an image pick-up element provided on a distal end side of the insertion part, a held surface provided at the insertion part and held by the endoscope holding surface, a biasing member that applies a rotational moment around the central axis of the insertion part to the image pick-up element, wherein the biasing member has an outer surface and is disposed inside the insertion part,

wherein a center of gravity of the biasing member is at a position eccentric from the central axis of the insertion part,

wherein the overtube has a movable body that is movable in a direction of the longitudinal axis, and the endoscope holding part and the treatment tool holding part are provided at the movable body,

wherein the movable body has a distal-end-side restricting part that restricts movement of the endoscope holding part on a distal end side of the movable body, and a proximal-end-side restricting part that restricts movement of the endoscope holding part on a proximal end side of the movable body, and the endoscope holding part is movable between the distal-end-side restricting part and the proximal-end-side restricting part.