Minimally-invasive surgery equipment

1. A minimally invasive surgical device ( 1 ) that is facilitated to be inserted into a body cavity through a patient's skin incision to perform a specific surgical procedure characterized by comprising:

a manipulable handle ( 2 ) manipulated by a user outside the body cavity, a treatment part ( 3 ) that holds a specific swappable surgical instrument that is inserted into the body cavity and manipulated using the manipulable handle ( 2 ), and a linking part ( 4 ), provided between the manipulable handle ( 2 ) and the treatment part ( 3 ), for disposing the surgical instrument ( 5 ) held by the treatment part ( 3 ) in a desired orientation at a desired position within the body cavity;

the linking part ( 4 ) comprising:

two or more connecting parts ( 7 , 8 ) that are connected in series in the longitudinal direction of the linking part ( 4 ) and held movable in a direction close to or apart from each other in a direction along a central axis with their central axes coinciding with each other,

wherein the two or more connecting parts ( 7 , 8 ) constitute a joint that permits rotation around the central axis or around an axis orthogonal to the central axis by combining the two or more connecting parts ( 7 , 8 ) with each other; and

a linking part control mechanism ( 13 , 14 ) that constricts the angle of the joint around the central axis and/or the angle thereof around an axis orthogonal to the central axis by driving the two or more connecting parts ( 7 , 8 ) in the direction of coming closer together from a position where they are separated from each other and engaging the connecting parts ( 7 , 8 ), thereby disposing the treatment part ( 3 ) at the desired position and in the desired orientation within the body cavity

wherein, when the two or more connecting parts ( 7 , 8 ) are separated from each other, the desired position and orientation of the treatment part are defined by displacement by the user holding an angle around the central axis of the joint or/and an angle around an axis orthogonal to the central axis and the position and orientation of the defined treatment part ( 3 ) is fixed by moving the connecting parts ( 7 , 8 ) from the position where they are separated from each other to the direction where they are close together by the linking part control mechanism ( 13 , 14 ).

2. The minimally invasive surgical device according to claim 1 , wherein:

the linking part control mechanism comprises:

a linking part control slider that is capable of sliding in the longitudinal direction of the manipulable handle, and the movement of which can be locked at a specific position; and

a flexible shaft member that is passed through the interior of the entirety of the linking part along its central axis, and is affixed at one end to the treatment part and at another end to the linking part manipulation slider; and

the linking part control slider is slid in the longitudinal direction of the manipulable handle to open or constrict the angle of the joint.

3. The minimally invasive surgical device according to claim 2 , wherein:

the linking part control slider is attached to a slide guider provided on the manipulable handle.

4. The minimally invasive surgical device according to claim 3 , wherein:

the shaft member is a tension-transmitting rod or wire; and

the linking part control slider is a tension slider for adjusting the tension of the tension-transmitting rod.

5. The minimally invasive surgical device according to claim 4 , wherein:

the tension of the tension-transmitting rod or wire is adjusted by operating the linking part control slider parallel to the longitudinal direction of the handle.

6. The minimally invasive surgical device according to claim 2 , wherein:

further comprising:

a surgical-treatment-part-controlling flexible shaft member that is connected at one end to the surgical treatment part, and the other end of which passed through the insides of the connecting parts and extends toward the handle; and

a surgical treatment part actuation slider that is attached to the handle in a state of connection to the other end of the surgical-treatment-part-controlling flexible shaft member.

7. The minimally invasive surgical device according to claim 6 , wherein:

the surgical treatment part actuation slider is attached to the linking part control slider, and is movable with respect to the linking part control slider.

8. The minimally invasive surgical device according to claim 1 , wherein:

the linking part comprises a first joint that permits rotation around the longitudinal axis and/or a second joint that permits rotation around an axis orthogonal to the longitudinal axis.

9. The minimally invasive surgical device according to claim 8 , wherein:

the connecting parts comprise recessed parts and projecting parts that face and are capable of engaging with each other, and the recessed parts and the projecting parts are disengaged when released by the angle control part, and engaged at a fixed angle when constricted thereby.

10. The minimally invasive surgical device according to claim 8 , wherein:

the connecting parts have a stopper mechanism that restricts the angle of rotation thereof around the axis orthogonal to the longitudinal axis.

11. The minimally invasive surgical device according to claim 10 , wherein:

the restricted angle of rotation is ±30°.

12. The minimally invasive surgical device according to claim 11 , wherein:

the linking part comprises a number of joints such that a 90°-180° bent shape can be maintained by a plurality of joints.