Actuating member and medical instrument

1. An actuating member for causing a flexible elongated member for medical use to perform a predetermined curving motion, the actuating member comprising:

a push-pull member comprising a first moving part and a second moving part which are configured to be movable relative to one another in an axial direction of the elongated member, the first moving part and the second moving part being pushable and pullable so as to cause the elongated member to curve in the axial direction of the elongated member;

a curving motion restricting member which is configured to be movable in the axial direction of the elongated member, and which is configured to restrict curving of at least a portion of the elongated member; and

an operation member configured to operate movements of the first moving part, the second moving part, and the curving motion restricting member,

wherein a surface of the operation member includes:

a first guide groove configured to guide movement of the first moving part,

a second guide groove configured to guide movement of the second moving part, and

a third guide groove configured to guide movement of the curving motion restricting member.

2. The actuating member according to claim 1 , wherein the third guide groove comprises a first region configured to allow the curving motion restricting member to be immovable, and a second region configured to allow the curving motion restricting member to be movable.

3. The actuating member according to claim 2 , wherein the third guide groove is configured so as to guide the curving motion restricting member by the second region after guiding the curving motion restricting member by the first region when the operation member is operated starting from a state where the elongated member is in a rectilinear form.

4. The actuating member according to claim 1 , wherein the curving motion restricting member comprises:

a restriction member which is configured to be movable in the axial direction of the elongated member and which is configured to restrict the curving motion of at least a portion of the elongated member; and

a connection member which is configured to be movable in the axial direction of the elongated member and which is connectable to and disconnectable from the restriction member,

wherein the third guide groove is configured to guide movement of the restriction member via the connection member.

5. The actuating member according to claim 4 , wherein the connection member includes a guide projection configured to be guided by the third guide groove.

6. The actuating member according to claim 5 , wherein one of the restriction member and the connection member includes a groove portion configured to allow for disconnection of the restriction member and the connection member, and the other of the restriction member and the connection member includes an engaging projection configured to engage with the groove portion.

7. The actuating member according to claim 6 , wherein the groove portion includes an axial groove provided in the axial direction of the elongated member, and an orthogonal groove orthogonal to the axial groove, the axial groove and the orthogonal groove being configured such that the restriction member is connected to the connection member when the engaging projection engages the orthogonal groove, and such that the restriction member is disconnected from the connection member when the engaging projection engages the axial groove.

8. The actuating member according to claim 4 , further comprising a switching member which is configured to be rotatable in a circumferential direction of the elongated member, and which is configured to switch between connection and disconnection of the restriction member and the connection member to each other.

9. The actuating member according to claim 8 , wherein, upon switching to disconnect the connection between the restriction member and the connection member, the switching member is configured to fix the restriction member at a predetermined position in the axial direction of the elongated member.

10. The actuating member according to claim 1 , wherein the operation member is configured to be rotatable about an axis extending in a direction intersecting the axial direction of the elongated member, and is configured such that rotation of the operation member causes the first moving part, the second moving part, and the curving motion restricting member to be moved.

11. The actuating member according to claim 1 , wherein the push-pull member further comprises a tubular part from which the first moving part and the second moving part extend.

12. A medical instrument comprising:

an elongated member; and

an actuating member comprising:

a push-pull member comprising a first moving part and a second moving part which are configured to be movable relative to one another in an axial direction of the elongated member, the first moving part and the second moving part being pushable and pullable so as to cause the elongated member to curve in the axial direction of the elongated member;

a curving motion restricting member which is configured to be movable in the axial direction of the elongated member, and which is configured to restrict curving of at least a portion of the elongated member; and

an operation member configured to operate movements of the first moving part, the second moving part, and the curving motion restricting member,

wherein a surface of the operation member includes:

a first guide groove configured to guide movement of the first moving part,

a second guide groove configured to guide movement of the second moving part, and

a third guide groove configured to guide movement of the curving motion restricting member.

13. The medical instrument according to claim 12 , wherein the curving motion restricting member comprises:

a restriction member which is configured to be movable in the axial direction of the elongated member and which is configured to restrict the curving motion of at least a portion of the elongated member; and

a connection member which is configured to be movable in the axial direction of the elongated member and which is connectable to and disconnectable from the restriction member,

wherein the third guide groove is configured to guide movement of the restriction member via the connection member.

14. The actuating member according to claim 13 , the connection member includes a guide projection configured to be guided by the third guide groove.

15. The actuating member according to claim 14 , wherein one of the restriction member and the connection member includes a groove portion configured to allow for disconnection of the restriction member and the connection member, and the other of the restriction member and the connection member includes an engaging projection configured to engage with the groove portion.

16. The actuating member according to claim 15 , wherein the groove portion includes an axial groove provided in the axial direction of the elongated member, and an orthogonal groove orthogonal to the axial groove, the axial groove and the orthogonal groove being configured such that the restriction member is connected to the connection member when the engaging projection engages the orthogonal groove, and such that the restriction member is disconnected from the connection member when the engaging projection engages the axial groove.

17. The actuating member according to claim 13 , further comprising a switching member which is configured to be rotatable in a circumferential direction of the elongated member, and which is configured to switch between connection and disconnection of the restriction member and the connection member to each other.

18. The actuating member according to claim 17 , wherein, upon switching to disconnect the connection between the restriction member and the connection member, the switching member is configured to fix the restriction member at a predetermined position in the axial direction of the elongated member.

19. An actuating member for causing a flexible elongated member for medical use to perform a predetermined curving motion, the actuating member comprising:

a push-pull member comprising a first moving part and a second moving part which are configured to be movable relative to one another in an axial direction of the elongated member, the first moving part and the second moving part being pushable and pullable so as to cause the elongated member to curve in the axial direction of the elongated member;

a curving motion restricting member which is configured to be movable in the axial direction of the elongated member, and which is configured to restrict curving of at least a portion of the elongated member; and

an operation member configured to operate movements of the first moving part, the second moving part, and the curving motion restricting member,

wherein one of the first moving part and the operation member includes a first guide groove configured to guide movement of the first moving part,

wherein one of the second moving part and the operation member includes a second guide groove configured to guide movement of the second moving part,

wherein one of the curving motion restricting member and the operation member includes a third guide groove configured to guide movement of the curving motion restricting member,

wherein the third guide groove comprises a first region configured to allow the curving motion restricting member to be immovable, and a second region configured to allow the curving motion restricting member to be movable, and

wherein the third guide groove is configured so as to guide the curving motion restricting member by the second region after guiding the curving motion restricting member by the first region when the operation member is operated starting from a state where the elongated member is in a rectilinear form.

20. An actuating member for causing a flexible elongated member for medical use to perform a predetermined curving motion, the actuating member comprising:

a push-pull member comprising a first moving part and a second moving part which are configured to be movable relative to one another in an axial direction of the elongated member, the first moving part and the second moving part being pushable and pullable so as to cause the elongated member to curve in the axial direction of the elongated member;

a curving motion restricting member which is configured to be movable in the axial direction of the elongated member, and which is configured to restrict curving of at least a portion of the elongated member; and

an operation member configured to operate movements of the first moving part, the second moving part, and the curving motion restricting member,

wherein one of the first moving part and the operation member includes a first guide groove configured to guide movement of the first moving part,

wherein one of the second moving part and the operation member includes a second guide groove configured to guide movement of the second moving part,

wherein one of the curving motion restricting member and the operation member includes a third guide groove configured to guide movement of the curving motion restricting member,

wherein the curving motion restricting member comprises:

a restriction member which is configured to be movable in the axial direction of the elongated member and which is configured to restrict the curving motion of at least a portion of the elongated member, and

a connection member which is configured to be movable in the axial direction of the elongated member and which is connectable to and disconnectable from the restriction member, and

wherein the third guide groove is configured to guide movement of the restriction member via the connection member.