TISSUE INJURY BY HIGH FREQUENCY ELECTRIC CURRENT: OBSERVATIONS WITH THE SANDISON-CLARK EAR-CHAMBER

1960 ◽  
Vol 38 (3) ◽  
pp. 195-210 ◽  
Author(s):  
Ian K Buckley
Keyword(s):  
Electric Current ◽  
High Frequency ◽  
Tissue Injury

scholarly journals STUDIES IN HYPERTHERMIA INDUCED BY THE HIGH FREQUENCY ELECTRIC CURRENT

1930 ◽  
Vol 85 (3) ◽  
pp. 675-686
Author(s):  
Fritz Bischoff ◽  
H.J. Ullmann ◽  
Elsie Hill ◽  
M. Louisa Long
Keyword(s):  
Electric Current ◽  
High Frequency

scholarly journals Endoscopic Ultrasound-Guided Radiofrequency Ablation (EUS-RFA) of the Pancreas in a Porcine Model

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Monica Gaidhane ◽  
Ioana Smith ◽  
Kristi Ellen ◽  
Jeremy Gatesman ◽  
Nagy Habib ◽  
...  
Keyword(s):  
Radiofrequency Ablation ◽  
High Frequency ◽  
Porcine Model ◽  
Tissue Injury ◽  
Pancreatic Head ◽  
Minimal Amount ◽  
Coagulative Necrosis ◽  
Ultrasound Guided ◽  
Distal Pancreas ◽  
Minimal Evidence

Backgrounds. Limited effective palliative treatments exist for pancreatic cancer which includes surgery or chemotherapy. Radiofrequency ablation (RFA) uses high frequency alternating current to ablate diseased tissue and has been used to treat various tumors. In this study, we evaluated a prototype probe adjusted to the EUS-needle to perform EUS-RFA to permit coagulative necrosis in the pancreas.Methods. Five Yucatan pigs underwent EUS-guided radiofrequency ablation of the head of their pancreas. Using an EUS-needle, RFA was applied with 6 mm and then 10 mm of the probe exposed at specific wattage for preset durations.Results. Only one pig showed moderate levels of pancreatitis (20% proximal pancreatitis). The other animals showed much lower areas of tissue damage. In 3 of the 5 pigs, the proximal pancreas showed greater levels of tissue injury than the distal pancreas, consistent with the proximity of the tissue to the procedure site. In 1 pig, both proximal and distal pancreas showed minimal pancreatitis (1%). There was minimal evidence of fat necrosis in intra-pancreatic and/or extra-pancreatic adipose tissue.Conclusion. EUS-guided RFA of the pancreatic head with the monopolar probe through a 19-gauge needle was well tolerated in 5 Yucatan pigs and with minimal amount of pancreatitis.

Vulcanization or Other Heat Treatment by Electrical Conduction

1944 ◽  
Vol 17 (1) ◽  
pp. 188-191
Author(s):  
Felix L. Yerzley
Keyword(s):  
Heat Treatment ◽  
Electric Current ◽  
High Frequency ◽  
Direct Consequence ◽  
Electrical Energy ◽  
Internal Resistance ◽  
Appreciable Amount ◽  
Rubber Belt ◽  
High Dielectric ◽  
Electrical Conductors

Abstract This communication relates to the heating of plastic materials of. a semiconducting nature by passing electricity through them. In particular, it relates to the vulcanization of rubber and rubberlike materials, including Neoprene, with heat generated by the conduction of an electric current and, similarly, it relates to the heat treatment of thermosetting plastics by conduction of an electric current. It is well known that all electrical conductors are heated to some extent by the passage of an electric current. This heating is a direct consequence of internal resistance. The effect so obtained is proportional to the electrical energy absorbed, and is expressed by the equation: power=I2R, in which I is the current in amperes between two points and R is the corresponding resistance in ohms. The unit of power is the watt. Others have used electrical means of heating unvulcanized rubber, but the disclosures differ fundamentally from this proposal. For example, Neerlye coils a steel ribbon and an uncured rubber belt in a spiral and heats the coil by passing electricity through the steel. Newton claims vulcanization by abeam of electrons from a cathode ray tube. The most significant disclosure is by Dufour. This claims the “process for the vulcanization of rubber characterized by the feature that the rubber to be heat-treated is arranged as a dielectric between the electrodes of an electric condenser to which there is applied a high frequency alternating current of a periodicity of several million cycles per second”. This patent is characterized by utilization of high-frequency fields of the order of several megacycles per second. Further, it is not required in induction curing with high-frequency current that the electrodes be in actual mechanical contact with the rubber. Induction curing is facilitated when the material to be heated has both a high power factor and a high dielectric constant, but high electrical conductivity of appreciable amount is not essential to the application of the method.

scholarly journals A Study of Possible Reasons of the Damage by Electric Current of Traction Induction Motors Bearings of Electric Trains Lastochka and the Ways to Prevent This

2021 ◽  
Vol 2096 (1) ◽  
pp. 012001
Author(s):  
M Pustovetov
Keyword(s):  
Electric Current ◽  
High Frequency ◽  
Induction Motors ◽  
Electrical Breakdown ◽  
The Other ◽  
Technical Solution ◽  
Insulation Coating ◽  
Rolling Elements ◽  
Current Flows ◽  
Frequency Current

Abstract There is a problem of damage of bearings of traction induction motors of electric trains Lastochka by electric current. Based on the fact that the bearings have a ceramic insulation coating, and the cases of its electrical breakdown is not fixed, the authors put forward a version that a high-frequency current flows through the bearing as through an electric capacitance. The analysis show that the cause of the current can be a radio standard GSM-R. The proposed technical solution against the damage of bearings: the use of grounding shaft rings, replace the bearings on the other with ceramic rolling elements, arrangement of separate high-frequency grounding for the GSM-R antenna.

Effect of different modes of high-frequency electric current on structural changes in the optic nerve in rabbits

2018 ◽  
Vol 71 (1) ◽  
pp. 60-66
Author(s):  
N. Bobrova ◽  
◽  
V. Vit ◽  
T. Sorochinskaya ◽  
N. Molchanyuk ◽  
...  
Keyword(s):  
Optic Nerve ◽  
Electric Current ◽  
High Frequency ◽  
Structural Changes
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