Electrosurgical medical system and method
First Claim
1. A method for delivering RF power from an electrosurgical generator to an electrosurgical electrode being used on a patient, said method comprising:
- providing an RF electrosurgical generator in a generator housing and a patient box in a patient box housing, said patient box housing disposed in close proximity to said patient and said generator housing disposed further from said patient than said patient box housing;
delivering an RF signal with a first RF power from said electrosurgical generator to said patient box;
increasing RF power of said RF signal in said patient box; and
delivering said RF signal with an increased RF power to said electrosurgical electrode as an RF output, wherein said patient box is coupled to said electrosurgical electrode by a cable not greater than 2 meters long.
1 Assignment
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Accused Products
Abstract
A medical device system and method provide an RF electrosurgical generator coupled to an electrosurgical electrode via a patient box disposed in close proximity to the patient. An RF signal is delivered from the generator to the patient box where signal power is increased and the RF signal delivered to the electrosurgical electrode. The patient box is coupled to the electrosurgical electrode by a short cable capable of carrying an HV, high frequency 5 MHz signal without leakage. An electrical characteristic associated with the electrosurgical electrode is monitored and a desired RF power output and duty cycle maintained by adjusting DC input voltage applied to an RF amplifier, responsive to the monitoring. The system determines when the electrosurgical cutting electrode has started cutting and switches from a start mode to a run mode having a different RF duty cycle and a reduced RF power output controlled by a servo system.
262 Citations
47 Claims
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1. A method for delivering RF power from an electrosurgical generator to an electrosurgical electrode being used on a patient, said method comprising:
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providing an RF electrosurgical generator in a generator housing and a patient box in a patient box housing, said patient box housing disposed in close proximity to said patient and said generator housing disposed further from said patient than said patient box housing;
delivering an RF signal with a first RF power from said electrosurgical generator to said patient box;
increasing RF power of said RF signal in said patient box; and
delivering said RF signal with an increased RF power to said electrosurgical electrode as an RF output, wherein said patient box is coupled to said electrosurgical electrode by a cable not greater than 2 meters long. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling an electrosurgical electrode of a medical device comprising:
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delivering energy from an RF generator to an electrosurgical electrode, said RF generator including an RF amplifier;
monitoring an electrical characteristic associated with said electrosurgical electrode; and
maintaining a desired RF power output and a desired RF duty cycle by adjusting DC input voltage applied to an output stage of said RF amplifier based on said monitoring. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for controlling an electrosurgical cutting electrode of a medical device comprising:
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delivering energy from an RF generator to an electrosurgical cutting electrode;
determining when said electrosurgical cutting electrode has started cutting tissue; and
switching said delivering energy from a start mode that provides a relatively high RF power output and a first RF duty cycle, to a run mode having a second RF duty cycle and a reduced RF power output controlled by a control servo system, responsive to said determining. - View Dependent Claims (34, 35, 36, 37)
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38. A method for mitigating leakage in an RF electrosurgical generator, comprising:
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delivering an RF signal from an RF electrosurgical generator to an electrosurgical electrode by way of a patient box, said RF electrosurgical generator including an RF amplifier;
providing a balanced and symmetrical shielded transmission line coupling said electrosurgical generator disposed in a first housing to said patient box disposed in a second, different housing;
providing a common mode choke in said patient box, said common mode choke including an output winding and a return winding, each winding wound about a ferrite core, said output winding and said return winding spaced apart and in parallel to maintain a desired impedance, said output winding comprising a wire carrying said RF signal as an output signal and said return winding comprising a duality of intertwined wires carrying a return signal from a return electrode, each winding having adjacent ribs spaced apart; and
directing a common mode signal from said RF signal to said common mode choke thereby blocking said common mode signal. - View Dependent Claims (39, 40, 41, 42)
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43. A medical device comprising:
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an electrosurgical generator in a generator housing;
a patient box in a patient box housing, said patient box housing disposed in close proximity to a patient and said generator housing disposed further from said patient than said patient box housing;
an electrosurgical electrode coupled to said patient box by a cable not greater than 2 meters long, said electrosurgical electrode for operating on a patient;
means for delivering an RF signal with a first RF power from said electrosurgical generator to said patient box;
means for increasing RF power of said RF signal in said patient box; and
means for delivering said RF signal with an increased RF power to said electrosurgical electrode as an RF output.
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44. A system for controlling an electrosurgical electrode of a medical device comprising:
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an RF generator coupled to an electrosurgical electrode, said RF generator including an RF amplifier;
means for delivering energy from said RF generator to said electrosurgical electrode;
means for monitoring an electrical characteristic associated with said electrosurgical electrode; and
means for maintaining a desired RF power output and a desired RF duty cycle by adjusting DC input voltage applied to an output stage of said RF amplifier based on said monitoring. - View Dependent Claims (45)
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46. A medical device comprising:
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an electrosurgical cutting electrode and an RF generator;
means for delivering energy from said RF generator to said electrosurgical cutting electrode;
means for determining when said electrosurgical cutting electrode has started cutting tissue; and
switching means for switching said delivering energy from a start mode to a run mode responsive to said determining, said start mode controlled by a matching unit and including a relatively high RF power output and a first RF duty cycle, and said run mode controlled by a servo system and having a second RF duty cycle and a reduced RF power output.
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47. A system for mitigating leakage in an RF electrosurgical generator, comprising:
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an RF electrosurgical generator coupled to a patient box coupled to an electrosurgical electrode;
a return electrode coupled to said patient box;
a balanced and symmetrical shielded transmission line coupling said RF electrosurgical generator disposed in a first housing to said patient box disposed in a second, different housing;
a common mode choke disposed in said patient box, said common mode choke including an output winding and a return winding, each winding wound about a ferrite core, said output winding and said return winding spaced apart and in parallel to maintain a desired impedance, said output winding comprising a wire carrying an RF output signal and said return winding comprising a duality of intertwined wires carrying a return signal from said return electrode, each winding having adjacent ribs spaced apart and said windings wound in opposite directions;
means for delivering an RF signal from said RF electrosurgical generator to said electrosurgical electrode by way of said patient box; and
means for directing a common mode signal from said RF signal to said common mode choke thereby blocking said common mode signal.
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Specification