;REEL/FRAME:004610/0412, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LIEBEL-FLARSHEIM COMPANY, A CORP. OF DE. Examples of monopolar devices include snares used for polypectomy and EMR, knives used for endoscopic submucosal dissection (ESD), sphincterotomes used for sphincterotomy during endoscopic retrograde cholangiopancreatography, and coagulation graspers/forceps used for hemostasis. 1, an electrosurgical unit having an oscillator generates RF signals at hectowatt power levels. © Copyright 2020 CONMED Corporation.
high-frequency current, Generators therefor with circuits for assuring patient safety, Indifferent or passive electrodes for grounding, Detecting, measuring or recording for diagnostic purposes; Identification of persons, Measuring bioelectric signals of the body or parts thereof, GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS, TECHNICAL SUBJECTS COVERED BY FORMER USPC, TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS, Electricity: power supply or regulation systems, ASSIGNMENT OF ASSIGNORS INTEREST. A control circuit defined in claim 1, wherein said saturable reactor is comprised of: two cup cores; at least one variable reactance winding wound abou each of said cup cores; and at least one DC control bias winding wound about each of said cup cores, whereas said variable reactance windings are connected in series so as to nullify the effect on said DC control coils winding.
0000085443 00000 n
About the two outer legs 22, 24 of the core 20 are wound variable reactance windings 26, 28 having substantially equal number of turns. The leads of the control winding 32 are connected to the DC terminals of a high frequency bridge rectifier 34.
165 0 obj <> endobj 176 0 obj <>/Filter/FlateDecode/ID[<183EEE2448AB9D1A25798A45EF1A69AB><0582E004F9FF4DBE8F0C0FA1298AEE57>]/Index[165 21]/Info 164 0 R/Length 69/Prev 853837/Root 166 0 R/Size 186/Type/XRef/W[1 2 1]>>stream 0000016616 00000 n It is the object of this invention to provide a new and improved control circuit for electrosurgical units to monitor the impedance of a patient plate interface and connecting cable.
FIG. Popular Electrosurgical Generator Unit Manufacturers and Models Available.
Erbe Erbotom T 400 C patent and that said Letters Patent are hereby corrected as shown below: r. Column 1, line 6A "exists" should be --exits--. I claim: i 1. In the case of low power coagulators, capacitive coupling between patient and ground is satisfactory.
2 is an alternative embodiment of the control circuit of the invention . 7. You hereby consent to our cookies if you continue to use our website.
0000000716 00000 n
This is in direct contrast to electrocautery whereby an electrode applies heat when it comes in contact with tissue. trailer the diagram (see Figure 10).The vertical lines at the outer edges of the diagram represent the source of electric power. Electrosurgical unit 1.
5. FIG. 0000012380 00000 n 8�$�ן^� Erbe Erbotom T 400 C Circuit diagram (1984) 600 KB Download prohibited by ERBE.
1 is a diagram of an electrosurgical unit which includes the control circuit of the invention. It would be, therefore, highly desirable to provide a simpler control circuit,- either to be used alone or to supplement one of the prior types of patient plate monitoring systems to additionally determine whether the patient plate electrode is contacting the patient. 90 0 obj <>stream 0000259189 00000 n The higher the amplitude of the RF current, the higher will be the rectified DC current passing through the control winding 32. Voltage (V, measured in volts) represents the electrical force required to push current through varying levels of tissue resistance in the circuit. ESUs, now with advanced microprocessors that facilitate the creation of multiple waveforms, use endoscopic accessories to deliver electrical current through a circuit to a specified target.
The AC terminals of the high frequency bridge rectifier are connected in series from the patient plate 17 to electrical ground through a first capacitor 36.
The monopolar mode (single electrode) is used for cutting and coagulation, the bipolar mode (forceps like electrode) is used mainly for destroying tissue. Figure 6-8. The alternating RF current flows from the active probe 16 through the patient to the patient plate 17, through the high frequency rectifier 34 across the capacitor 36 to ground.
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The contact area of such an extraneous ground connection is likely to be too small for the magnitude of current present and a burn at this site is almost a certainty. ), Table 12-1. 0000085139 00000 n
During an operation the active probe is placed in contact with the patient.
The invention described herein is a safety circuit for preventing burns to a patient during an electrosurgical operation.
The reactor 18 includes a three-legged magnetic core 20 substantially symmetrical.
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