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US 6,958,063 B1Granted
Plasma generator for radio frequency surgery
AssigneeSoring GmbH Medizintechnik
InventorsJoachim Soll, Klaus Zobawa, Buu Son Trinh, Holger Soring
Life of this patent
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Abstract
The present invention furnishes a plasma generator for generating a cold plasma jet beam in the application field of medicine and in particular of surgery as well as other fields of science. The plasma generator is furnished with a separate, frequency tunable oscillator, wherein the frequency tunable oscillator controls the power end stage through a driver stage. The radio frequency of the outpout of the generator is determined by a resonance frequency of a resonance transformer. The plasma current is limited by a capacitor disposed in the hand piece.
Claims41
A plasma generator for generating a cold plasma jet beam comprising a frequency tunable oscillator;
- a power end stage connected to the frequency tunable oscillator, wherein the oscillator controls a power end stage;
- a resonance transformer connected directly to the power end stage for delivering a high voltage radio frequency;
- a phase comparison stage having a first input and a second input, an automatic frequency control circuit connected to the phase comparison stage;
- an oscillator connected to the automatic frequency control circuit, and connected to the first input of the phase comparison stage, wherein the power end stage operates as a switch and is connected to the second input of the phase comparison stage;
- wherein the automatic frequency control circuit (9) tunes the frequency of the rectangular pulse voltage (4), wherein the secondary winding of the resonance transformer (6) delivers a high sinusoidal radio frequency voltage with values of from about 2000 to 4000 volts.
2 more elements
A plasma generator for generating a cold plasma jet beam comprising a frequency tunable oscillator;
- a power end stage connected to the frequency tunable oscillator, wherein the oscillator controls a power end stage;
- a resonance transformer connected directly to the power end stage for delivering a high voltage radio frequency;
- a hand piece having a first end;
- a radio frequency connection cable including a gas hose connected to the power end stage and to the first end to the hand piece;
- wherein the hand piece comprises:
- an insulated gas tube connected to the gas hose;
- a first capacitor part including a gas tube, wherein the insulated gas tube extends into the first capacitor part including a gas tube and wherein the first capacitor part is disposed centrally in the elongated cylindrical hand piece;
- a metal tube connected to the insulated gas tube is disposed centrally in the elongated cylindrical hand piece and forms the second capacitor part;
- an electrode having a tip disposed at a second end of the hand piece disposed opposite to the first end and connected to the metal tube;
- a capacitor disposed in the hand piece wherein the capacitor is connected to the tip of the electrode and to the radio frequency connection cable.
7 more elements
A plasma generator for generating a cold plasma jet beam comprising a frequency tunable oscillator;
- a power end stage connected to the frequency tunable oscillator, wherein the oscillator controls a power end stage;
- a resonance transformer connected directly to the power end stage for delivering a high voltage radio frequency;
- a hand piece having a first end;
- a radio frequency connection cable including a gas hose connected to the power end stage and to the first end to the hand piece;
- wherein the hand piece comprises:
- an insulated gas tube connected to the radio frequency connection cable;
- a first capacitor part including a gas tube, wherein the insulated gas tube extends into the first capacitor part including a gas tube and wherein the first capacitor part is disposed centrally in the elongated cylindrical hand piece;
- a metal tube connected to the insulated gas tube is disposed centrally in the elongated cylindrical hand piece and forms the second capacitor part;
- an electrode having a tip disposed at a second end of the hand piece disposed opposite to the first end and connected to the metal tube;
- a capacitor disposed in the hand piece wherein the capacitor is connected to the tip of the electrode and to the radio frequency connection cable.
7 more elements
A plasma generator for generating a cold plasma jet beam comprising
- a frequency tunable oscillator;
- a power end stage connected to the frequency tunable oscillator, wherein the oscillator controls the power end stage;
- a resonance transformer connected directly to the power end stage for delivering a high voltage radio frequency;
- wherein the power end stage operates as a switch, and wherein the resonance transformer has a primary winding and has a secondary winding, wherein an output signal of the power end stage is delivered to the primary winding of the resonance transformer;
- and
- a hand piece, wherein a radio frequency generator is connected to the hand piece by a cable, and wherein the resonance transformer is part of the radio frequency generator.
3 more elements
A plasma generator for generating a cold plasma jet beam comprising
- a frequency tunable oscillator,
- a power end stage connected to the frequency tunable oscillator, wherein the oscillator controls the power end stage;
- a resonance transformer connected directly to the power end stage for delivering a high voltage radio frequency;
- means for changing the operating voltage, wherein a control of the delivered RF-power is performed by changing the operating voltage;
- and a power capture stage connected to the power end stage for capturing the power of the power end stage by multiplying an input current with an input voltage entering at the power end stage,
- wherein the frequency of the delivered RF-power is about 350 kHz.
3 more elements
A plasma generator for generating a cold plasma jet beam comprising a frequency tunable oscillator;
- a power end stage connected to the frequency tunable oscillator, wherein the oscillator controls a power end stage;
- a hand piece having a first end;
- a radio frequency connection cable including a gas hose connected to the power end stage and to the first end of the hand piece;
- wherein the hand piece comprises:
- an insulated gas tube connected to the radio frequency connection cable;
- a first capacitor part including a gas tube, wherein the insulated gas tube extends into the first capacitor part including a gas tube and wherein the first capacitor part is disposed centrally in the elongated cylindrical hand piece;
- an electrode having a tip disposed at a second end of the hand piece disposed opposite to the first end;
- a capacitor disposed in the hand piece wherein the capacitor is connected to the tip of the electrode and to the radio frequency connection cable;
- a gas orifice disposed at the second end of the hand piece, wherein the hand piece is tapered conically at its second end;
- an ignition needle disposed in the gas orifice, wherein the first capacitor part extends to the ignition needle;
- a second capacitor part disposed opposed to the first capacitor part.
8 more elements
A plasma generator for generating of a cold plasma jet beam wherein a plasma generator is furnished with a separate frequency tunable oscillator, wherein the separate frequency tunable oscillator controls a power end stage and wherein a resonance transformer is directly connected to the power end stage and wherein the plasma generator includes the power end stage and the resonance transformer;
- wherein a phase comparison stage (10) measures a phase difference between a rectangular pulse signal and the output signal of the power end stage (5), wherein the output of the phase comparison stage is connected to an input of an automatic frequency control circuit (9);
- wherein the automatic frequency control circuit (9) tunes the frequency of the rectangular pulse voltage (4), wherein the secondary winding of the resonance transformer (6) delivers a high sinusoidal radio frequency voltage with values of from about 2000 to 4000 volts.
A plasma generator for generating a cold plasma jet beam comprising
- a casing;
- a radio frequency generator for delivering a radio frequency capacitive displacement current;
- a gas supply apparatus for delivering a noble gas wherein the radio frequency generator and the gas supply apparatus are placed in the casing;
- a hand piece cable connected to the radio frequency generator and to the gas supply apparatus;
- a hand piece connected to the hand piece cable for operating a plasma;
- wherein the radio frequency generator comprises
- a phase comparison stage having a first input and a second input and an automatic frequency control circuit (9) connected to the phase comparison stage;
- an oscillator connected to the automatic frequency control circuit, and connected to the first input of the phase comparison stage;
- a power end stage connected to the oscillator and operating as a switch, wherein the power end stage is controlled by the oscillator and connected to the second input of the phase comparison stage;
- a power capture/power limiter connected to the power end stage, wherein the power capture/power limiter limits the consumption of the power and current by the power end stage;
- an automatically controllable voltage source, wherein an automatically controllable voltage source delivers the voltage to the power end stage and is controlled by the capture/power limiter,
- a resonance transformer having a primary winding and having a secondary winding, wherein the primary winding is connected to the second input of the phase comparison stage and to the power end stage, and wherein the primary winding is grounded:
- wherein the phase comparison stage (10) measures a phase difference between the rectangular pulse signal and the output signal of the power end stage (5), wherein the output of the phase comparison stage is connected to an input of the automatic frequency control circuit (9);
- wherein the automatic frequency control circuit (9) tunes the frequency of the rectangular pulse voltage (4), wherein the secondary winding of the resonance transformer (6) delivers a high sinusoidal radio frequency voltage with values of from about 2000 to 4000 volts.
11 more elements
A plasma generator for generating a cold plasma jet beam comprising
- a casing:
- a radio frequency generator for delivering a radio frequency capacitive displacement current;
- a gas supply apparatus for delivering a noble gas wherein the radio frequency generator and the gas supply apparatus are placed in the casing;
- a hand piece cable connected to the radio frequency generator and to the gas supply apparatus;
- a hand piece connected to the hand piece cable for operating a plasma;
- wherein the hand piece exhibits the shape of an elongated cylinder and comprises:
- a metal tube (20), wherein the metal tube is disposed centrally in the hand piece, and wherein the metal tube is a second layer of a capacitance (18);
- an electrode having a tip disposed at a second end of the hand piece and connected to the metal tube;
- an insulated gas line (19) slidable onto the metal tube (20) and supplying a noble gas;
- a conducting layer (18a) disposed onto the gas line (19), wherein the conducting layer is a first part of a capacitance (18);
- a gas orifice disposed at the second end of the hand piece, wherein the hand piece is tapered conically at its second end.
8 more elements
A hand piece for delivering a radio frequency power and a gas flow from a plasma generator to an object comprising
- a capacitor disposed between a first and a second end of the hand piece, wherein the capacitor limits the radio frequency power;
- a flow gas tube connected to the first end of the hand piece for delivering the gas to the hand piece;
- a gas orifice disposed at the second end of the hand piece;
- a metal tube connected to the flow gas tube and to the gas orifice;
- a coaxial line, wherein the coaxial line connected to the first end of the hand piece and to a first pole of the capacitor,
- an ignition needle disposed in the gas orifice, wherein the ignition needle is connected to a second pole of the capacitor.
3 more elements
Dependencies are inferred from the claim text.