Electrosurgical unit
First Claim
1. An electrosurgical unit comprising:
- vacuum tube oscillator means for providing an ungrounded output of a given frequency;
power supply means including a transformer for supplying said oscillator means with a high voltage;
coagulation output means for coupling to said oscillator means, and providing a coagulation signal for use in coagulation procedures;
cutting output means for coupling to said oscillator means, and providing a cutting signal for use in cutting procedures;
switching circuit means for selectively connecting said coagulation output means or said cutting output means to said oscillator means;
intensity control means for coupling to said power supply means, and varying the voltage supplied to said oscillator means, said intensity control means including a variable coil in parallel with said transformer for controlling the output voltage across said transformer;
modulation means for coupling to said oscillator means, and providing intermittent operation of said oscillator means, said modulation means including a multivibrator means, and coagulation level control means for varying the duty cycle of said multivibrator means;
and operation control means in said switching circuit means for interconnecting said intensity control means to said power supply means when said cutting output means is connected to said oscillator means, for interconnecting said modulation means to said oscillator means when said coagulation output means is connected to said oscillator means, and for disconnecting from said oscillator means one of said modulation means or said intensity control means when the other is connected thereto.
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Accused Products
Abstract
An electrosurgical unit for use in tissue cutting or coagulation procedur A vacuum tube oscillator operating in push-pull relationship generates RF oscillations which are extracted across a balanced coil transformer, the secondary of which is ungrounded. Forceps are provided to be connected across the output of the transformer for producing an isolated voltage for use in sealing off bleeding blood vessels. A handpiece is also provided for connection across the transformer output for selectively producing a cutting voltage or a coagulation voltage. An intensity control circuit is capable of connection in the power supply to control the output voltage. A pulse modulation unit is capable of being connected at the input of the oscillator to control the "on" time of the oscillator. A switching circuit operates to interconnect the intensity control to the power supply when the cutting probe is being utilized for cutting procedures, and connects the pulse modulation unit to the oscillator when the coagulation signal is being provided across either the forceps or the handpiece. An indifferent plate, also known as a dispersion electrode, is utilized together with the handpiece for cutting procedures. The indifferent plate is completely isolated from ground to prevent shocks and burns occurring on the patient at inadvertent ground points.
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Citations
22 Claims
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1. An electrosurgical unit comprising:
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vacuum tube oscillator means for providing an ungrounded output of a given frequency; power supply means including a transformer for supplying said oscillator means with a high voltage; coagulation output means for coupling to said oscillator means, and providing a coagulation signal for use in coagulation procedures; cutting output means for coupling to said oscillator means, and providing a cutting signal for use in cutting procedures; switching circuit means for selectively connecting said coagulation output means or said cutting output means to said oscillator means; intensity control means for coupling to said power supply means, and varying the voltage supplied to said oscillator means, said intensity control means including a variable coil in parallel with said transformer for controlling the output voltage across said transformer; modulation means for coupling to said oscillator means, and providing intermittent operation of said oscillator means, said modulation means including a multivibrator means, and coagulation level control means for varying the duty cycle of said multivibrator means; and operation control means in said switching circuit means for interconnecting said intensity control means to said power supply means when said cutting output means is connected to said oscillator means, for interconnecting said modulation means to said oscillator means when said coagulation output means is connected to said oscillator means, and for disconnecting from said oscillator means one of said modulation means or said intensity control means when the other is connected thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification