Electroconvergent cautery.
A new cautery system known as the electroconvergent cautery system is described. This cautery system uses a radiofrequency current of 13.56 MHz. The current is passed through an amplifier, an impedance matching system, and a loading and tuning coil into a probe. After the probe tip is touched to the tissue, the mismatch of impedance between the probe tip and the generator is minimized to almost zero, resulting in high-current density at the probe tip, which causes pinpoint heating of the tissue at the point where it is touched by the probe without spread of heat to the surrounding tissue. This heat can cut and vaporize tissue and coagulate vessels. The probe can also be used to coagulate vessels with standard surgical forceps. Because convergence of energy is used for tissue heating, a grounding pad is not needed. The system can also be used under cerebrospinal fluid or saline.
Patil
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Division of Neurosurgery, University of Nebraska Medical Center, Omaha.
Yamanashi
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D001254:Astrocytoma / Q000601:surgery; D001932:Brain Neoplasms / Q000556:secondary / Q000601:surgery*; D018795:Device Approval; D004564:Electrocoagulation / Q000295:instrumentation*; D004867:Equipment Design; D005625:Frontal Lobe / Q000601:surgery; D005910:Glioma / Q000601:surgery; D006488:Hemostasis, Surgical / Q000295:instrumentation; D006801:Humans; D008279:Magnetic Resonance Imaging; D010871:Pinealoma / Q000601:surgery; D013724:Teratoma / Q000601:surgery