Medical system and method of controlling medical treatment tools

1. A medical system, comprising:

a slave medical treatment tool to be controlled, the slave medical treatment tool including a first shaft coupled to a first grip grasped by a user, a first end effector located at a distal end of the first shaft, a moving joint for adjusting an angle of the first end effector relative to the first shaft, and a driver for driving the moving joint;

a master medical instrument serving as a master control instrument, the master medical instrument including a second shaft coupled to a second grip grasped by the user and a second end effector located at a distal end of the second shaft;

a first trocar having an insertion opening through which the slave medical treatment tool is inserted;

a second trocar having an insertion opening through which the master medical instrument is inserted;

a sensor for producing out a sensor signal including at least an angle of the second effector; and

a controller that sets a follow-up criterion based on the sensor signal produced out of the sensor and enables follow-up processing for driving the driver such that the angle of the first end effector follows the follow-up criterion.

2. A medical system as recited in claim 1 , wherein the sensor comprises a tilt angle detection sensor located at the second trocar or the master medical instrument.

3. A medical system as recited in claim 1 , wherein the sensor comprises an amount-of-movement detection sensor for detecting an amount of rectilinear movement of the master medical instrument relative to the second trocar.

4. A medical system as recited in claim 1 , wherein the sensor comprises an amount-of-rotation detection sensor for detecting an amount of rotation of the master medical instrument relative to the second trocar.

5. A medical system as recited in claim 1 , further comprising a direction input portion of producing an operational signal based on operation, wherein the controller enables operation processing that drives the driver based on an operational signal from the direction input portion to adjust an angle of the first end effector.

6. A medical system as recited in claim 5 , further comprising a mode input portion of producing a changeover signal based on operation, wherein the controller enables changeover processing that implements a changeover between the follow-up processing and the operation processing based on a mode signal from the mode input portion.

7. A medical system as recited in claim 1 , wherein the master medical instrument includes a moving joint for adjusting an angle of the first end effector relative the first shaft.

8. A medical system as recited in claim 7 , wherein the follow-up processing sets a follow-up criterion based on a sensor signal produced out of the sensor and a state of the moving joint of the master medical instrument.

9. A medical system as recited in claim 7 , further comprising a master/slave changeover input portion that produces a changeover signal based on operation, wherein the controller enables changeover processing between the master medical instrument and the slave medical treatment tool based on a changeover signal from the master/slave changeover input portion.

10. A method of controlling a medical system, the medical system comprising:

a slave medical instrument configured to be inserted through a hole of a first trocar,

a master medical instrument configured to be inserted through a hole of a second trocar,

a second end effector located at a distal end of the slave medical instrument,

a sensor for producing out a sensor signal including at least an angle of the first end effector,

and

a driver for adjusting an angle of the second end effector, the method comprising:

detecting the sensor signal;

setting a follow-up criterion on the basis of the sensor signal; and

driving the driver on the basis of the follow-up criterion.