HF SURGICAL GENERATOR

• US 20110170321A1
• Filed: 08/10/2009
• Published: 07/14/2011
• Est. Priority Date: 09/08/2008
• Status: Active Grant

• Current Assignee: Erbe Elektromedizin GmbH (C. Erbe GmbH)
• Original Assignee: Erbe Elektromedizin GmbH (C. Erbe GmbH)
• Inventors: Eisele, Florian, Schall, Heiko
• Granted Patent: US 9,168,083 B2
• Time in Patent Office: Days
• US Class Current: 363/37
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00601 Cutting
• CPC Class Codes: A61B 2018/00642 with feedback, i.e. closed loop control
• CPC Class Codes: A61B 2018/00767 Voltage
• CPC Class Codes: A61B 2018/00892 Voltage
• CPC Class Codes: H03L 5/00 Automatic control of voltage, current, or power

Abstract

A high-frequency surgical generator including a power supply for supplying rectified electrical energy, a power oscillator for supplying a potential-free, DC current-free and DC voltage-free high frequency voltage and a control device for controlling the high frequency voltage wherein the power supply is configured as a current source for supplying a load-independent output current, such that the load-independent output current of the power supply serves as the control variable for controlling the high-frequency voltage. The target value of the load-independent output current is pre-determined by the control device. The high-frequency surgical generators configured as such achieve improved modulation capability.

Claims

1-13. -13. (canceled)

14. A high-frequency surgical generator, comprising:

a power supply for supplying rectified electrical energy;

a power oscillator for supplying a high-frequency voltage, the high-frequency voltage being potential-free, DC current-free and DC voltage-free; and

a control device for controlling the high-frequency voltage,

wherein the power supply is configured as a current source for supplying a load-independent output current, the target value of which is pre-determined by the control device such that the load-independent output current of the power supply serves as the control variable for controlling the high-frequency voltage.

15. The high-frequency surgical generator according to claim 14, wherein the power supply comprises a main rectifier device for converting a main alternating voltage into a substantially constant DC voltage, and an intermediate circuit for supplying adjustable, rectified energy.

16. The high-frequency surgical generator according to claim 14, wherein the power supply comprises a step-down converter.

17. The high-frequency surgical generator according to claim 16, wherein the power supply does not comprise an output capacitor.

18. The high-frequency surgical generator according to claim 14, wherein the power supply comprises a potential-separating forward converter.

19. The high-frequency surgical generator according to claim 18, wherein the power supply does not comprise an output capacitor.

20. The high-frequency surgical generator according to claim 14, wherein the control device comprises a control system with a finite adjustment time.

21. The high-frequency surgical generator according to claim 20, wherein the control system is a dead beat controller.

22. The high-frequency surgical generator according to claim 14, wherein the power oscillator comprises a power electronics driving circuit configured as an H-bridge of semiconductor circuit elements.

23. The high-frequency surgical generator according to claim 22, further comprising diodes provided in series with the semiconductor circuit elements.

24. The high-frequency surgical generator according to claim 22, wherein the driving circuit is configured such that in an energy-recovery operation, energy stored in reactive components is fed back to the power supply.

25. The high-frequency surgical generator according to claim 22, wherein the driving circuit is configured such that the semiconductor circuit elements are controlled in pairs, in phase-synchronized resonance.

26. A method for generating a high-frequency voltage in a high-frequency surgical generator, comprising:

generating a rectified electrical energy in a power supply; and

generating a potential-free, DC current-free and DC voltage-free regulated high-frequency voltage,

wherein the power supply supplies a load-independent output current with a pre-determined target value, such that the load-independent output current of the power supply regulates the high-frequency voltage as the control variable.

27. The method according to claim 26, wherein the power supply is regulated by means of a control system having a finite adjustment time.

28. The method according the claim 27, wherein the control system is a dead beat controller.

29. The method according to claim 26, wherein, in an energy-recovery operation, energy stored in reactive components is fed back to the power supply.