Ultrasonic surgical instrument and ultrasonic surgical system

1. An ultrasonic surgical instrument, comprising a waveguide rotatable around an axis and in threaded connection with a transducer, wherein said ultrasonic surgical instrument further comprises a force transmission mechanism and a rotatable mechanism; said force transmission mechanism is in fixed connection with said waveguide, provided with at least one stress surface thereon; said rotatable mechanism comprises a pushing mechanism and a rotatable driving mechanism having at least one applying surface thereon; said stress surface and said applying surface are not perpendicular to said axis and can be engaged with each other; said pushing mechanism provides a pushing force to press said rotatable driving mechanism towards said force transmission mechanism so as to force said stress surface being engaged with said applying surface; said pushing force is configured such that when a force between said stress surface and said applying surface is in excess of a predetermined value, said rotatable driving mechanism can overcome said pushing force so as to make said stress surface disengage with said applying surface.

2. The ultrasonic surgical instrument according to claim 1 , wherein said rotatable driving mechanism comprises a knob body and a knob core in no-rotatable connection therewith, and said knob core can slide with respect to said knob body along said axis; said stress surface is arranged on said knob core, and said pushing mechanism is configured as a compressed spring arranged between said knob core and said knob body.

3. The ultrasonic surgical instrument according to claim 2 , wherein said force transmission mechanism is a force transferring sheath covered outside said waveguide.

4. The ultrasonic surgical instrument according to claim 3 , wherein a wrist pin is disposed through said force transferring sheath and said waveguide in radial direction so as to connect said force transferring sheath and said waveguide together.

5. The ultrasonic surgical instrument according to claim 4 , wherein an inner tube and an outer tube are further arranged between said waveguide and said force transferring sheath successively, and said wrist pin is disposed therethrough.

6. The ultrasonic surgical instrument according to claim 4 , wherein a silica gel sheath is covered outside said wrist pin.

7. The ultrasonic surgical instrument according to claim 3 , wherein a flange is arranged on said force transferring sheath extending radially outwards, and said stress surface is arranged on an end of said flange.

8. The ultrasonic surgical instrument according to claim 3 , wherein said rotatable mechanism is mounted on said force transferring sheath; said knob core can axially slide with respect to said force transferring sheath, and at least one projection is arranged on an end of said force transferring sheath to block said knob body from sliding axially.

9. The ultrasonic surgical instrument according to claim 2 , wherein said knob body is provided with at least two grooves extending radially from an inner wall thereof; said knob core is provided with at least one slider accordingly, wherein, said slider is received in said grooves respectively and slidable therein.

10. The ultrasonic surgical instrument according to claim 2 , wherein a knob rubber cover is arranged on said outer surface of said knob body.

11. The ultrasonic surgical instrument according to claim 2 , wherein an I-shaped tendon or a cross tendon is arranged on said outer surface of said knob body.

12. The ultrasonic surgical instrument according to claim 2 , wherein a plurality of first oblique teeth are arranged on said rotatable driving mechanism, and said stress surface is configured as a ramp of each of said first oblique teeth; and a plurality of second oblique teeth are arranged on said force transmission mechanism, and said applying surface is configured as a ramp of each of said second oblique teeth.

13. The ultrasonic surgical instrument according to claim 1 , wherein a plurality of first oblique teeth are arranged on said rotatable driving mechanism, and said stress surface is configured as a ramp of each of said first oblique teeth; and a plurality of second oblique teeth are arranged on said force transmission mechanism, and said applying surface is configured as a ramp of each of said second oblique teeth.

14. The ultrasonic surgical instrument according to claim 1 , wherein a collar cap is further coupled with said waveguide, and a protection sheath is covered said collar cap.

15. An ultrasonic surgical system, comprising an ultrasonic surgical instrument, wherein the ultrasonic surgical instrument comprising, a waveguide rotatable around an axis and in threaded connection with a transducer, wherein said ultrasonic surgical instrument further comprises a force transmission mechanism and a rotatable mechanism; said force transmission mechanism is in fixed connection with said waveguide, provided with at least one stress surface thereon; said rotatable mechanism comprises a pushing mechanism and a rotatable driving mechanism having at least one applying surface thereon; said stress surface and said applying surface are not perpendicular to said axis and can be engaged with each other; said pushing mechanism provides a pushing force to press said rotatable driving mechanism towards said force transmission mechanism so as to force said stress surface being engaged with said applying surface; said pushing force is configured such that when a force between said stress surface and said applying surface is in excess of a predetermined value, said rotatable driving mechanism can overcome said pushing force so as to make said stress surface disengage with said applying surface, the ultrasonic surgical system further comprising a generator, and a transducer and a controlling switch, both of which are wired to said generator, wherein said ultrasonic surgical instrument is in threaded connection with said transducer.

16. The ultrasonic surgical system according to claim 15 , wherein said controlling switch is a foot switch or a hand switch.

17. The ultrasonic surgical system according to claim 15 , wherein said rotatable driving mechanism comprises a knob body and a knob core in no-rotatable connection therewith, and said knob core can slide with respect to said knob body along said axis; said stress surface is arranged on said knob core, and said pushing mechanism is configured as a compressed spring arranged between said knob core and said knob body.

18. The ultrasonic surgical system according to claim 17 , wherein said force transmission mechanism is a force transferring sheath covered outside said waveguide.

19. The ultrasonic surgical system according to claim 18 , wherein a wrist pin is disposed through said force transferring sheath and said waveguide in radial direction so as to connect said force transferring sheath and said waveguide together.

20. The ultrasonic surgical system according to claim 15 , wherein a plurality of first oblique teeth are arranged on said rotatable driving mechanism, and said stress surface is configured as a ramp of each of said first oblique teeth; and a plurality of second oblique teeth are arranged on said force transmission mechanism, and said applying surface is configured as a ramp of each of said second oblique teeth.