Robotic surgical system, patient-side apparatus, and control method of robotic surgical system

1. A robotic surgical system comprising:

a patient-side apparatus including a manipulator arm to which a surgical instrument is attached to a tip end side of the manipulator arm;

an operator-side apparatus including an operation unit to receive an operation on the surgical instrument; and

a controller configured or programmed to control operation of the surgical instrument based on an amount of operation corresponding to the operation; wherein

the surgical instrument includes:

an end effector;

a first support;

a second support; and

a shaft connected to the second support;

the first support supports the end effector such that the end effector is rotatable about a first axis that is orthogonal to a direction in which the shaft extends;

the second support supports the first support such that the first support is rotatable about a second axis that is spaced apart from the first axis in the direction in which the shaft extends and is orthogonal to the direction in which the shaft extends and the first axis; and

the controller is configured or programmed to change a length between the first axis and the second axis in the direction in which the shaft extends, the length serving as a control parameter, according to a rotation speed of the shaft with respect to the amount of operation to control the operation of the surgical instrument.

2. The robotic surgical system according to claim 1 , wherein the controller is configured or programmed to gradually decrease the control parameter as the rotation speed increases.

3. The robotic surgical system according to claim 2 , wherein the controller is configured or programmed to linearly decrease the control parameter as the rotation speed increases.

4. The robotic surgical system according to claim 1 , wherein

the controller is configured or programmed to:

decrease the control parameter as the rotation speed increases when the rotation speed is equal to or higher than a first rotation speed and equal to or lower than a second rotation speed that is higher than the first rotation speed; and

set the control parameter to a constant control parameter corresponding to the second rotation speed when the rotation speed exceeds the second rotation speed.

5. The robotic surgical system according to claim 4 , wherein the controller is configured or programmed to maintain the control parameter constant without decreasing the control parameter when the rotation speed is lower than the first rotation speed.

6. The robotic surgical system according to claim 4 , wherein the controller is configured or programmed to decrease the control parameter to control the operation of the surgical instrument when the rotation speed is equal to or higher than the first rotation speed while the surgical instrument is bent such that the first support rotates about the second axis and intersects with the direction in which the shaft extends.

7. The robotic surgical system according to claim 4 , wherein

the controller is configured or programmed to:

generate a command value of the rotation speed according to the rotation speed with respect to the amount of operation;

apply a low-pass filter to the command value; and

decrease the control parameter to control the operation of the surgical instrument when the command value to which the low-pass filter has been applied is equal to or greater than the first rotation speed.

8. A patient-side apparatus comprising:

a manipulator arm to which a surgical instrument is attached to a tip end side of the manipulator arm; and

a controller configured or programmed to control operation of the surgical instrument based on an amount of operation corresponding to an operation on the surgical instrument received by an operation unit; wherein

the surgical instrument includes:

an end effector;

a first support;

a second support; and

a shaft connected to the second support;

the first support supports the end effector such that the end effector is rotatable about a first axis that is orthogonal to a direction in which the shaft extends;

the second support supports the first support such that the first support is rotatable about a second axis that is spaced apart from the first axis in the direction in which the shaft extends and is orthogonal to the direction in which the shaft extends and the first axis; and

the controller is configured or programmed to change a length between the first axis and the second axis in the direction in which the shaft extends, the length serving as a control parameter, according to a rotation speed of the shaft with respect to the amount of operation to control the operation of the surgical instrument.

9. The patient-side apparatus according to claim 8 , wherein the controller is configured or programmed to gradually decrease the control parameter as the rotation speed increases.

10. The patient-side apparatus according to claim 9 , wherein the controller is configured or programmed to linearly decrease the control parameter as the rotation speed increases.

11. The patient-side apparatus according to claim 8 , wherein

the controller is configured or programmed to:

decrease the control parameter as the rotation speed increases when the rotation speed is equal to or higher than a first rotation speed and equal to or lower than a second rotation speed that is higher than the first rotation speed; and

set the control parameter to a constant control parameter corresponding to the second rotation speed when the rotation speed exceeds the second rotation speed.

12. The patient-side apparatus according to claim 11 , wherein the controller is configured or programmed to maintain the control parameter constant without decreasing the control parameter when the rotation speed is lower than the first rotation speed.

13. The patient-side apparatus according to claim 11 , wherein the controller is configured or programmed to decrease the control parameter to control the operation of the surgical instrument when the rotation speed is equal to or higher than the first rotation speed while the surgical instrument is bent such that the first support rotates about the second axis and intersects with the direction in which the shaft extends.

14. The patient-side apparatus according to claim 11 , wherein

the controller is configured or programmed to:

generate a command value of the rotation speed according to the rotation speed with respect to the amount of operation;

apply a low-pass filter to the command value; and

decrease the control parameter to control the operation of the surgical instrument when the command value to which the low-pass filter has been applied is equal to or greater than the first rotation speed.

15. A control method executed by a controller of a robotic surgical system, the robotic surgical system including a patient-side apparatus including a manipulator arm to which a surgical instrument is attached to a tip end side of the manipulator arm, an operator-side apparatus including an operation unit to receive an operation on the surgical instrument, and the controller, the surgical instrument including an end effector, a first support, a second support, and a shaft connected to the second support, the first support supporting the end effector such that the end effector is rotatable about a first axis that is orthogonal to a direction in which the shaft extends, the second support supporting the first support such that the first support is rotatable about a second axis that is spaced apart from the first axis in the direction in which the shaft extends and is orthogonal to the direction in which the shaft extends and the first axis, the control method comprising:

receiving an amount of operation corresponding to the operation on the surgical instrument received by the operation unit; and

changing a length between the first axis and the second axis in the direction in which the shaft extends, the length serving as a control parameter, according to a rotation speed of the shaft with respect to the amount of operation to control operation of the surgical instrument.

16. The control method according to claim 15 , wherein the controller is configured or programmed to gradually decrease the control parameter as the rotation speed increases.

17. The control method according to claim 16 , wherein the controller is configured or programmed to linearly decrease the control parameter as the rotation speed increases.

18. The control method according to claim 15 , wherein

the controller is configured or programmed to:

decrease the control parameter as the rotation speed increases when the rotation speed is equal to or higher than a first rotation speed and equal to or lower than a second rotation speed that is higher than the first rotation speed; and

set the control parameter to a constant control parameter corresponding to the second rotation speed when the rotation speed exceeds the second rotation speed.

19. The control method according to claim 18 , wherein the controller is configured or programmed to maintain the control parameter constant without decreasing the control parameter when the rotation speed is lower than the first rotation speed.

20. The control method according to claim 18 , wherein the controller is configured or programmed to decrease the control parameter to control the operation of the surgical instrument when the rotation speed is equal to or higher than the first rotation speed while the surgical instrument is bent such that the first support rotates about the second axis and intersects with the direction in which the shaft extends.