Medical manipulator, treatment system, and treatment method

1. A medical manipulator comprising:

a plurality of arms formed in a cylindrical shape each with a distal end portion of which is made of a rigid member having a bending portion capable of bending,

an insertion portion made of a rigid member having a plurality of channels in which base ends of the plurality of arms are connected to a distal end of the insertion portion so as to connect lumens of the arms to the plurality of channels,

a photographic device provided at the distal end of the insertion portion,

a plurality of operating portions that operates each of the bending portions, and

a plurality of transmission members that are connected to each of the bending portions,

a plurality of operating portion links that connect each of the transmission members and each of the operating portions, wherein

each of the bending portions has:

a first bending portion that is capable of bending in a predetermined direction by an operation of the operating portion, and

a second bending portion provided in a base end than the first bending portion that is capable of fixing the plurality of arms in a bent state so as to mutually separate,

each of the transmission members has:

a first region which is flexible, and

a second region which is rigid and connected to a base end portion of the first region,

each of the operating portions is configured to be capable of being in a straight state along an axial line of the insertion portion and able to be maintained in a state of forming a predetermined angle with respect to the axial line of the insertion portion, and

with a maximum swing angle of the operating portions during operation being set to be at most the predetermined angle, and

the second region of the transmission members has:

a first transmission member for bending the bending portion upward,

a second transmission member for bending the bending portion downward,

a third transmission member for bending the bending portion leftward, and

a fourth transmission member for bending the bending portion downward,

the operating portion links has:

a first operating portion link that is connected to a base end of the first transmission member,

a second operating portion link that is connected to a base end of the second transmission member,

a third operating portion link that is connected to a base end of the third transmission member,

a fourth operating portion link that is connected to a base end of the fourth transmission member,

the distal ends of the first operating portion link and the second operating portion link that serve as turning support points when the operating portion and the insertion portion are made to form the predetermined angle are disposed on a bisectional line of distal end support points of the third operating portion link and the fourth operating portion link when the bending portion is in a linear state.

2. The medical manipulator according to claim 1 , wherein

the operation portion and the transmission members are connected via a plurality of operating portion links,

distances between base ends of the plurality of operating portion links are longer than distances between the second regions of a plurality of the transmission members to which the operating portion links are connected, and

the plurality of transmission members further comprising an adjustment portion capable of absorbing a difference of travel amounts of the transmission members in an axial line direction by being bent.

3. The medical manipulator according to claim 2 , wherein

the adjustment portion is provided in the first region so that the difference of the travel amount is absorbed by a portion with flexibility being bent.

4. The medical manipulator according to claim 1 , wherein

at least one of the operating portions is provided with a second bending operating portion connected to the second bending portion via the transmission member, and

the second bending operating portion is provided with a lock mechanism capable of holding the transmission member so that the second bending portion is fixed in a bent state.

5. A treatment system comprising:

the medical manipulator according to claim 1 ;

a treatment instrument which is capable of being inserted to the channel and the arms of the medical manipulator, wherein

the treatment instrument comprises:

a rigid portion that is provided at the distal end of the treatment instrument that performs treatments, and

a flexible portion that is connected to a base end of the rigid portion,

when the treatment instrument is inserted to the medical manipulator to a limit, only the rigid portion is projected from the distal ends of the arms and only the flexible portion is located in a lumen of the bending portion.

6. The treatment system according to claim 5 , wherein

the treatment instrument is configured such that a diameter of the flexible portion is larger than a diameter of the rigid portion, and the arms are configured such that a diameter at least part of each lumen located closer to the distal end than the bending portion are set so that the rigid portion can enter but the flexible portion cannot enter.

7. The medical manipulator according to claim 1 , wherein

the operating portion is able to swing about an axial swing center, and

the swing center of the operating portion during the operation is away from the axial line of the insertion portion.