High frequency power source

• US 20070255271A1
• Filed: 02/08/2007
• Published: 11/01/2007
• Est. Priority Date: 12/28/2000
• Status: Active Grant

• Current Assignee: Senorx Incorporated (Becton, Dickinson & Co)
• Original Assignee: Senorx Incorporated (Becton, Dickinson & Co)
• Inventors: Quick, Richard, Lubock, Paul, Sawicz, Conrad, Dabney, James, Kussman, Dan
• Granted Patent: US 9,750,557 B2
• Time in Patent Office: Days
• US Class Current: 606/39
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/1233 with circuits for assuring patient safety
• CPC Class Codes: A61B 18/16 Indifferent or passive electrodes for grounding
• CPC Class Codes: A61B 2018/00601 Cutting
• CPC Class Codes: A61B 2018/00607 Coagulation and cutting with the same instrument
• CPC Class Codes: A61B 2018/00666 using a threshold value
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00726 Duty cycle
• CPC Class Codes: A61B 2018/00827 Current
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2018/00892 Voltage
• CPC Class Codes: A61B 2018/00898 Alarms or notifications created in response to an abnormal condition
• CPC Class Codes: A61B 2018/0094 Types of switches or controllers
• CPC Class Codes: A61B 2018/1213 creating an arc
• CPC Class Codes: A61B 2018/1266 with DC current output
• CPC Class Codes: A61B 2018/1286 having a specific transformer
• CPC Class Codes: A61B 2018/162 located on the probe body

Abstract

A high frequency electrosurgical power generator configured to produce electrical power at a frequency of about 1 to about 14 MHz and preferably having an essentially sinusoidal waveform with a voltage level up to 1,000 Vrms, and a current level up to 5 Amps. The output of the high frequency electrosurgical power generator is connected to an electrosurgical tool configured to receive the voltage and current produced by the electrosurgical power generator and deliver the voltage and current to an electrosurgical site. The output of the electrosurgical generator preferably is an essentially sinusoid waveform with a frequency between about 3 MHz and about 8 MHz, up to about 700 volts rms, up to about 2 amps, with a total power of up to 1,000 watts.

Claims

1-31. -31. (canceled)

32. A method of electrosurgically cutting tissue, comprising:

generating a high frequency, essentially sinusoidal waveform having a frequency of about 1 to about 14 MHz and a total harmonic distortion of less than 5%;

directing the waveform to an electrosurgical tool having an electrosurgical cutting element; and

applying the electrosurgical cutting element to heterogenous tissue to electrosurgically cut the tissue.

33. A method as defined in claim 32, wherein the essentially sinusoidal waveform has a frequency between about 1 MHz and about 10 MHz.

34. A method as defined in claim 32, wherein the essentially sinusoidal waveform has a frequency of about 3 MHz to about 8 MHz.

35. A method as defined in claim 32, wherein the essentially sinusoidal waveform has a frequency of about 3.4 MHz to about 5 MHz.

36. A method as defined in claim 32, wherein the essentially sinusoidal waveform has a power level of up to 1,000 watts.

37. A method as defined in claim 32, wherein the essentially sinusoidal waveform has a power level of about 500 watts to about 1,000 watts.

38. A method as defined in claim 32, wherein the essentially sinusoidal waveform has a voltage level of up to 700 volts rms.

39. A method as defined in claim 32 wherein the essentially sinusoidal waveform has a voltage level of about 300 volts to about 600 volts.

40. A method as defined in claim 32, wherein the essentially sinusoidal waveform has a current capacity of up to 5 amps.

41. A method of generating a high frequency signal for use in an electrosurgical system, the method comprising:

generating a high frequency control signal;

applying the control signal to at least one power delivery unit of a power generator configured to produce a high power waveform in response to the control signal having a frequency between 1 and 14 MHz;

filtering the high power waveform to produce an essentially sinusoidal output waveform; and

adjusting the control signal in response to sensing of desired waveform parameters at an electrosurgical tool.

42. A method as defined in claim 41, wherein the output waveform is a sinusoidal waveform with a frequency between about 3 MHz to and about 10 MHz.

43. A method as defined in claim 41, wherein the output waveform is a sinusoidal waveform with a frequency of about 3.4 MHz to about 8 MHz.

44. A method as defined in claim 41, wherein the output waveform is a sinusoidal waveform with a frequency of about 3.4 MHz to about 5 MHz.

45. A method as defined in claim 41, wherein the output waveform is a sinusoidal waveform with a power level of up to 1,000 watts.

46. A method as defined in claim 41, wherein the output waveform has a power level of about 500 watts to about 1,000 watts.

47. A method as defined in claim 41, wherein the output waveform is a sinusoidal waveform with a voltage level of up to 700 volts rms.

48. A method as defined in claim 41 wherein the output waveform has a voltage level of about 300 volts to about 600 volts

49. A method as defined in claim 41, wherein the output waveform is a sinusoidal waveform with a current capacity of up to 5 amps.

50. A method as defined in claim 41, wherein the output waveform has any out of band frequencies attenuated at least 6 dB.

51-78. -78. (canceled)

79. A method for controlling an electrosurgical tissue cutting electrode of a medical device comprising:

a. providing an RF generator;

b. delivering RF energy from the RF generator to the electrosurgical tissue cutting electrode;

c. monitoring DC voltage between the electrosurgical tissue cutting electrode and tissue; and

d. moving the electrosurgical tissue cutting electrode when the DC voltage is detected to be at a level to cut tissue.

80. The method of claim 79 wherein the electrosurgical generator has a start mode when the DC voltage is less than the level to cut tissue.

81. The method of claim 80 wherein the electrosurgical generator has a run mode when the DC voltage is at or exceeds the level to cut tissue.

82. The Method of claim 81 wherein the electrosurgical tissue cutting electrode is moved during the run mode to cut tissue.

83. The method of claim 79 wherein the DC voltage level is selected to ensure that a conductive plasma has formed on the tissue cutting electrode.

84. The method of claim 79 wherein the tissue cutting electrode has an arcuate shape.

85. The method of claim 84 wherein the arcuate shaped tissue cutting electrode is moved to cut tissue by rotation.