Multi-bendable medical device

A medical device for multiple bends, the medical device comprising:

• an insertion portion which is configured to be inserted into a body and which includes a central axis and is configured to extend in an axial direction of the central axis,
• wherein:
• the insertion portion includes:
• a distal-side bending portion configured to bend in a first bending direction and a second bending direction, the first bending direction including a first bending orientation and a third bending orientation which are substantially orthogonal to the central axis and which are opposite to each other, the second bending direction including a second bending orientation and a fourth bending orientation which are substantially orthogonal to the central axis and the first bending direction and which are opposite to each other,
• a proximal-side bending portion which is disposed closer to a proximal side than the distal-side bending portion in the axial direction and which is configured to bend in the first bending orientation,
• a first distal-side traction member which is inserted through the distal-side bending portion and the proximal-side bending portion and which is disposed on the side of the first bending orientation, the first distal-side traction member including a first distal-side fixing portion fixed to the distal end of the distal-side bending portion in the axial direction, the first distal-side traction member being pulled toward the proximal end in the axial direction to allow the distal-side bending portion to bend in the first bending orientation,
• a second distal-side traction member which is inserted through the distal-side bending portion and the proximal-side bending portion and which is disposed on the side of the second bending orientation, the second distal-side traction member including a second distal-side fixing portion fixed to the distal end of the distal-side bending portion in the axial direction, the second distal-side traction member being pulled toward the proximal end in the axial direction to allow the distal-side bending portion to bend in the second bending orientation,
• a proximal-side traction member which is inserted through the proximal-side bending portion and which is disposed on the side of the bending orientation, the proximal-side traction member including a proximal-side fixing portion fixed to the distal end of the proximal-side bending portion in the axial direction, the proximal-side traction member being pulled toward the proximal end in the axial direction to allow the proximal-side bending portion to bend in the first bending orientation, and
• a holding portion which is provided at the distal end of the proximal-side bending portion in the axial direction and which is disposed on the side of the bending orientation and which holds the distal-side traction member movably back and forth in the axial direction,
• the proximal-side fixing portion is disposed at substantially the same position as the first distal-side fixing portion in a circumferential direction of the central axis,
• the holding portion is disposed on the side of the fourth bending orientation with respect to the proximal-side fixing portion in the circumferential direction,
• the distal-side bending portion includes three or more substantially cylindrical bending members which are substantially coaxially arranged in the axial direction and which are rotatably connected to each other, the three or more bending members including at least two bending members which are connected to each other rotatably in the first bending direction around a first rotation axis extending in the second bending direction, and at least two bending members which are connected to each other rotatably in the second bending direction around a second rotation axis extending in the first bending direction,
• the three or more bending members include at least one through bending member,
• the through bending member includes a through portion which is disposed on the side of the first bending orientation and which is extending in the axial direction, the first distal-side traction member being inserted through the through portion movably back and forth in the axial direction, and the through bending member supporting the first distal-side traction member,
• the through portion extends fully between the position of the first distal-side fixing portion and the position of the holding portion in the circumferential direction,
• the three or more bending members include at least one regulation bending member,
• the regulation bending member includes a regulation through portion which is disposed on the side of the first bending orientation and which is extending in the axial direction, the first distal-side traction member being inserted through the regulation through portion movably back and forth in the axial direction, and the regulation through portion supporting the first distal-side traction member, and
• the regulation through portion is disposed closer to the side of the fourth bending orientation than the second rotation axis in the second bending direction, and when the second distal-side traction member is pulled toward the proximal end in the axial direction to bend the distal-side bending portion in the second bending orientation, the regulation through portion regulates the movement of the first distal-side traction member to or beyond the second rotation axis in the through portion in the second bending orientation.

A medical device for multiple bends, the medical device comprising:

• an insertion portion which is configured to be inserted into a body and which includes a central axis and is configured to extend in an axial direction of the central axis,
• wherein:
• the insertion portion includes:
• a distal-side bending portion configured to bend in a bending orientation which is substantially orthogonal to the central axis,
• a proximal-side bending portion which is disposed closer to a proximal side than the distal-side bending portion in the axial direction and which is configured to bend in the bending orientation,
• a distal-side traction member which is inserted through the distal-side bending portion and the proximal-side bending portion and which is disposed on the side of the bending orientation, the distal-side traction member including a distal-side fixing portion fixed to the distal end of the distal-side bending portion in the axial direction, the distal-side traction member being pulled toward the proximal end in the axial direction to allow the distal-side bending portion to bend in the bending orientation,
• a proximal-side traction member which is inserted through the proximal-side bending portion and which is disposed on the side of the bending orientation, the proximal-side traction member including a proximal-side fixing portion fixed to the distal end of the proximal-side bending portion in the axial direction, the proximal-side traction member being pulled toward the proximal end in the axial direction to allow the proximal-side bending portion to bend in the bending orientation, and
• a holding portion which is provided at the distal end of the proximal-side bending portion in the axial direction and which is disposed on the side of the bending orientation and which is configured to hold the distal-side traction member movably back and forth in the axial direction,
• the proximal-side fixing portion is disposed at substantially the same position as the distal-side fixing portion in a circumferential direction of the central axis,
• the holding portion is disposed at a position different from the proximal-side fixing portion in the circumferential direction,
• the distal-side bending portion includes two or more substantially cylindrical bending members which are substantially coaxially arranged in the axial direction and which are rotationally connected to each other,
• the two or more bending members includes at least one guide bending member,
• the guide bending member includes a guide through portion which is disposed on the side of the bending orientation, which is respectively arranged at the bending members adjacent to each other, which is configured to be inserted through the one bending member disposed on the proximal end side out of the bending members in the axial direction along a reference line, and configured to be inserted through the other bending member displaced in the circumferential direction with respect to the one bending member along the reference line, the reference line connecting between the position of the distal-side fixing portion and the position of the holding portion and extending in the axial direction in such a manner as to be displaced in the circumferential direction, and
• the distal-side traction member is configured to be inserted through the guide through portion movably back and forth along the reference line.