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US 5,964,759 AGranted
Electroconvergent cautery system
AssigneeOrtho Development Corporation
InventorsWilliam S. Yamanashi, Arun Angelo Patil
Life of this patent
Estimating the term…
Abstract
A method for surgically treating tissue in a patient. The steps comprise touching a surgical tool to tissue that is to be surgically treated; heating the surgical tool by converging current to the tip of the surgical tool to create a high current density at the tip of the surgical tool so as to instantaneously vaporize the tissue being touched; and restricting the heat to the contact point on the tissue. The method eliminates the need for a solenoid coil and a grounding component.
Claims26
A method for surgically treating tissue in a patient comprising the steps of:
- a) selecting a surgical tool for contacting tissue that is to be surgically treated;
- b) generating alternating current of a pre-selected frequency with a radio frequency generator;
- c) electrically coupling an impedance matching power source and control means with a power amplifier for matching the impedance of the surgical tool with the radio frequency generator;
- d) placing the surgical tool in close proximity to tissue that is to be surgically treated;
- e) identifying an impedance difference between the surgical tool and the impedance of the radio frequency generator;
- and
- f) heating the surgical tool by nullifying the impedance difference and converging current from the power source and control means to the surgical tool so that current flow in the tissue is avoided and a high current density at a tip of the surgical tool is created so as to instantaneously vaporize the tissue being touched.
4 more elements
A method for vaporizing, cutting and/or cauterizing tissue comprising the steps of:
- obtaining a probe tip for treating tissue in a surgical procedure;
- placing the probe tip in close proximity to the tissue to be treated in the surgical procedure;
- generating an alternating current waveform having a pre-selected frequency, the alternating current waveform being generated by a power generator;
- measuring a difference in impedance between the probe tip and an output of the power generator;
- and
- nullifying any impedance difference between the probe tip and the output of the power generator by touching the tissue with the probe tip and converging current from power generator to the probe tip, thereby heating the probe tip.
3 more elements
Apparatus for vaporizing, cutting and/or cauterizing tissue, comprising:
- a probe tip for treating tissue in a surgical procedure;
- a loading and tuning coil connected in series with the probe tip;
- a watts/ampere meter connected in series with the loading and tuning coil;
- an impedance matching device connected in series with the watts/ampere meter and including means for nullifying detected impedance differences;
- and
- a power generator connected in series with the impedance matching device for generating an alternating current of a preselected frequency;
- said loading and tuning coil being operable as a triggering means for sensing the presence of tissue to be cauterized without use of a grounding component or a solenoid coil and for heating the probe tip by nullifying an impedance difference between the probe tip and the power generator.
4 more elements
A method for surgically treating tissue in a patient comprising the steps of:
- a) selecting a surgical tool for contacting tissue that is to be surgically treated;
- b) generating alternating current of a pre-selected frequency with a radio frequency generator;
- c) electrically coupling an impedance matching sower source and control means with a sower amplifier for matching the impedance of the surgical tool with the radio frequency generator;
- d) placing the surgical tool in close proximity to tissue that is to be surgically treated;
- e) identifying an impedance difference between the surgical tool and the impedance of the radio frequency generator;
- f) heating the surgical tool by nullifying the impedance difference and converging current from the Power source and control means to the surgical tool so that current flow in the tissue is avoided and a high current density at a tip of the surgical tool is created so as to instantaneously vaporize the tissue being touched;
- and
- a) wherein the step of selecting a surgical tool comprises selecting a laparoscope forceps having blades and main stems, wherein the blades are short and the main stems thereof are long.
5 more elements
A method for surgically treating tissue in a patient comprising the stems of:
- a) selecting a surgical tool for contacting tissue that is to be surgically treated;
- b) generating alternating current of a pre-selected frequency with a radio frequency generator;
- c) electrically coupling an impedance matching sower source and control means with a sower amplifier for matching the impedance of the surgical tool with the radio frequency generator;
- d) placing the surgical tool in close proximity to tissue that is to be surgically treated;
- e) identifying an impedance difference between the surgical tool and the impedance of the radio frequency generator;
- f) heating the surgical tool by nullifying the impedance difference and converging current from the power source and control means to the surgical tool so that current flow in the tissue is avoided and a high current density at a tip of the surgical tool is created so as to instantaneously vaporize the tissue being touched;
- and
- g) wherein the step of selecting a surgical tool comprises selecting an endoscopic probe, the probe being rigid and having a tip, the probe having means to bend the probe tip at a right angle.
5 more elements
A method for surgically treating tissue in a patient comprising the steps of:
- a) selecting a surgical tool for contacting tissue that is to be surgically treated;
- b) generating alternating current of a pre-selected frequency with a radio frequency generator;
- c) electrically coupling an impedance matching power source and control means with a power amplifier for matching the impedance of the surgical tool with the radio frequency generator;
- d) placing the surgical tool in close proximity to tissue that is to be surgically treated;
- e) identifying an impedance difference between the surgical tool and the impedance of the radio frequency generator;
- f) heating the surgical tool by nullifying the impedance difference and converging current from the power source and control means to the surgical tool so that current flow in the tissue is avoided and a high current density at a tin of the surgical tool is created so as to instantaneously vaporize the tissue being touched;
- and
- g) wherein the step of selecting a surgical tool comprises selecting a lesion generating probe for ablation of various accessory pathways in the heart for arythmic patients.
5 more elements
Dependencies are inferred from the claim text.