Electrosurgical medical device with power modulation
AssigneeCovidien LP
InventorsArthur W. Zikorus, Michael S. Mirizzi
Life of this patent
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Abstract
An electrosurgical ablation device provides pulse width modulated DC power to a heating segment in a catheter for use in providing treatment. In some embodiments the DC power to be modulated is sourced from an AC/DC power converter coupled to a source of AC power. In some embodiments the DC power to be modulated is sourced from a battery. In some embodiments the device switchably selects for modulation DC power sourced from either the AC/DC power converter or the battery, for example based on availability of power from the AC/DC power converter.
Claims21
1-19. (canceled)
A medical system comprising:
- a heating element configured to ablate tissue;
- a power converter configured to convert a high direct current (DC) power to a low DC power lower than the high DC power;
- a pulse width modulator configured to modulate the second DC power and deliver DC power pulses to the heating element;
- and
- a pulse width modulation (PWM) driver configured to provide signals that control the pulse width modulator to turn on and off power to generate the DC power pulses.
A method comprising:
- converting, by a power converter of a medical system, a high direct current (DC) power to a low DC power lower than the high DC power;
- modulating, by a pulse width modulator of the medical system, the low DC power;
- delivering, by the pulse width modulator, DC power pulses to a heating element;
- and
- providing, by a pulse width modulation (PWM) driver of the medical system, signals controlling the pulse width modulator to turn on and off power to generate the DC power pulses.
A medical system comprising:
- a heating element configured to ablate tissue;
- an AC/DC power converter;
- a battery;
- a power converter configured to convert a high direct current (DC) power to a low DC power lower than the high DC power;
- a pulse width modulator configured to modulate the second DC power and deliver DC power pulses to the heating element;
- a switch configured to switchably provide power from either the AC/DC converter or the battery to the pulse width modulator;
- and
- a pulse width modulation (PWM) driver configured to provide signals that control the pulse width modulator to turn on and off power to generate the DC power pulses, wherein the PWM driver is configured to control the pulse width modulator to decrease a duty cycle of the DC power pulses in response to a sensed temperature from a temperature sensor being greater than a desired temperature plus a first offset value, and wherein the PWM driver is configured to control the pulse width modulator to increase the duty cycle of the DC power pulses in response to the sensed temperature from the temperature sensor being less than the desired temperature minus a second offset value.
Dependencies are inferred from the claim text.