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Simultaneous generation of two AC outputs at different frequencies from a single-phase inverter offers practical benefits and control flexibility for many industrial applications. In this paper, a dual-frequency selective harmonic elimination (DFSHE) modulation method is proposed to generate and control two individual frequencies in an H-bridge, while diminishing undesired harmonics. Two AC elements...
Electrosurgery involves the use of high-frequency (typically 100–500 kHz) alternating current (AC) to elicit a clinical response in tissue (e.g., cutting or cauterization) using a plasma arc. Standard electrosurgical generators (ESGs) are based on resonant inverters, which constrain the output frequency and waveshape. This paper describes a fast tracking ESG capable of shaping the output AC waveform...
Neuromuscular stimulation (“NMS”) is frequently caused by application of various types of energy (radiofrequency, ultrasonic, or even mechanical) during surgical procedures. Neuromuscular blocking drugs do not always provide complete paralysis, resulting in potentially dangerous muscle stimulation events. In the case of radiofrequency energy, modification of the spectral content may serve to minimize...
A new power supply circuit significantly increases the utility of Argon Plasma Coagulation by varying patient inclusion in the plasma-forming circuit, and by supporting novel bipolar plasma instruments. This technology spans a large gap in present plasma medicine market offerings, increasing controllability and producing previously-unobtainable tissue effects.
Designing instruments and power supplies for electrosurgery (a critical tool in modern surgical practice) is a difficult proposition; a large number of competing variables affect an even larger number of electrosurgical performance metrics. This paper describes the design of an apparatus used to tightly control experimental variables, record high-speed data from numerous sensors, and process the results...
A planar concentrating solar cell based on a highly transparent sol-gel concentrator, metallic mirrors, and double sided PV devices is described. Highly transparent silica glasses, synthesized by sol-gel polymerization of tetraethylorthosilicate (TEOS), accompanied with an Ag back reflector were used for concentrating sunlight. By using TEOS, hydrochloric acid, ethanol, and water as the precursors...
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