Surgical apparatus

1. A surgical apparatus comprising:

a steerable member that is bendable and comprises a plurality of bending segments with channels therein, the steerable member comprising at least one lumen;

a plurality of bending actuation wires that are arranged to pass through the at least one lumen of the steerable member and cause the steerable member to bend;

a flexible member comprising a flexible material that is provided at a proximal end of the steerable member;

an end effector provided at a distal end of the steerable member;

an effector actuation wire that is arranged to pass through the steerable member and the flexible member and connected to the end effector to actuate the end effector; and

at least one sleeve forming a path of travel of the effector actuation wire passing through the steerable member or the flexible member, both ends of the sleeve being fixed to an inside of the steerable member or the flexible member;

wherein a body of the sleeve is longer than a distance of the steerable member or the flexible member between two points at which both opposite ends of the sleeve are fixed; and

wherein the sleeve comprises an elastic material.

2. A surgical apparatus comprising:

a steerable member that is bendable and comprises a plurality of bending segments with channels therein, the steerable member comprising at least one lumen;

a plurality of bending actuation wires that are arranged to pass through the at least one lumen of the steerable member and cause the steerable member to bend;

a flexible member comprising a flexible material that is provided at a proximal end of the steerable member;

an end effector provided at a distal end of the steerable member;

an effector actuation wire that is arranged to pass through the steerable member and the flexible member and connected to the end effector to actuate the end effector; and

at least one sleeve forming a path of travel of the effector actuation wire passing through the steerable member or the flexible member, both ends of the sleeve being fixed to an inside of the steerable member or the flexible member;

wherein a body of the sleeve is longer than the longest possible path of the effector actuation wire that is formed between two points at which both opposite ends of the sleeve are fixed when the steerable member or the flexible member is bent; and

wherein the sleeve comprises an elastic material.

3. The surgical apparatus of claim 1 or 2 , wherein the steerable member and the flexible member have a hollow space for the sleeve to be placed therein.

4. The surgical apparatus of any one of claims 1 - 3 , wherein both opposite ends of the at least one sleeve are fixed at the distal end of the steerable member and the proximal end of the flexible member.

5. A surgical apparatus comprising:

a steerable member that is bendable and comprises a plurality of bending segments with channels therein, the steerable member comprising at least one lumen;

a plurality of bending actuation wires that are arranged to pass through the at least one lumen of the steerable member and cause the steerable member to bend; and

a flexible member comprising a flexible material that is provided at a proximal end of the steerable member;

wherein the steerable member comprises a distal end steerable portion and a proximal end steerable portion, which bend separately, wherein the distal end steerable portion is configured to bend with a distal end bending actuation wire provided along the at least one lumen in the distal end steerable portion, and the proximal end steerable portion is configured to bend with a proximal end bending actuation wire provided along the at least one lumen in the proximal end steerable portion; and

wherein the surgical apparatus further comprises:

at least one sleeve forming a path for the distal end bending actuation wire and/or a path for the proximal end bending actuation wire, passing through the steerable member or the flexible member, both ends of the sleeve being fixed to an inside of the steerable member or the flexible member;

wherein a body of the sleeve is longer than a distance of the steerable member or the flexible member between two points at which both opposite ends of the sleeve are fixed; and

wherein the sleeve comprises an elastic material.

6. A surgical apparatus comprising:

a steerable member that is bendable and comprises a plurality of bending segments with channels therein, the steerable member comprising at least one lumen;

a plurality of bending actuation wires that are arranged to pass through the at least one lumen of the steerable member and cause the steerable member to bend; and

a flexible member comprising a flexible material that is provided at a proximal end of the steerable member;

wherein the steerable member comprises a distal end steerable portion and a proximal end steerable portion, which bend separately, wherein the distal end steerable portion is configured to bend with a distal end bending actuation wire provided along the at least one lumen in the distal end steerable portion, and the proximal end steerable portion is configured to bend with a proximal end bending actuation wire provided along the at least one lumen in the proximal end steerable portion; and

wherein the surgical apparatus further comprises:

at least one sleeve forming a path for the distal end bending actuation wire and/or a path for the proximal end bending actuation wire, passing through the steerable member or the flexible member, both ends of the sleeve being fixed to an inside of the steerable member or the flexible member;

wherein a body of the sleeve is longer than the longest possible path of the distal end bending actuation wire and/or the proximal end bending actuation wire that is formed between two points at which both opposite ends of the sleeve are fixed when the steerable member or the flexible member is bent; and

wherein the sleeve comprises an elastic material.

7. The surgical apparatus of claim 5 or 6 , wherein the at least one sleeve includes at least a sleeve forming a path for the distal end bending actuation wire, one end of the sleeve forming a path for the distal end bending actuation wire being fixed at a proximal end of the distal end steerable portion or a distal end of the proximal end steerable portion and the other end being fixed at a proximal end of the flexible member.

8. The surgical apparatus of claim 7 , wherein the distal end bending actuation wire is located along a curved path when the distal end steerable portion is bent.

9. The surgical apparatus of claim 5 or 6 , wherein the at least one sleeve includes at least a sleeve forming a path for the proximal end bending actuation wire, one end of the sleeve forming a path for the proximal end bending actuation wire being fixed at a proximal end of the proximal end steerable portion or a distal end of the flexible member and the other end being fixed at a proximal end of the flexible member.

10. The surgical apparatus of claim 9 wherein the proximal end bending actuation wire is located along a curved path when the proximal end steerable portion is bent.