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Diathermy is electrically induced heat or the use of high-frequency electromagnetic currents as a form of physical therapy and in surgical procedures. The earliest observations on the reactions of the human organism to high-frequency electromagnetic currents were made by Jacques Arsene d'Arsonval .
Induction welding of plastics, and some types of diathermy machines commonly operate in this range. These devices centered on 27.12 MHz with a tolerance of ±163 kHz, that is, 26.957 to 27.283 MHz. These devices centered on 27.12 MHz with a tolerance of ±163 kHz, that is, 26.957 to 27.283 MHz.
Examples of applications for the use of radio frequency (RF) energy in these bands include RF heating, microwave ovens, and medical diathermy machines. The powerful emissions of these devices can create electromagnetic interference and disrupt radio communication using the same frequency , so these devices are limited to certain bands of ...
These were limited to frequencies of 0.1 – 2 MHz, called "longwave" diathermy. The current was applied directly to the body with contact electrodes, which could cause skin burns. In the 1920s the development of vacuum tube machines allowed frequencies to be increased to 10 – 300 MHz, called "shortwave" diathermy. The energy was applied to ...
The company expanded into making its own plastic bodies for radio sets, with EKCO Plastics later becoming a manufacturer of domestic wares. The company merged in 1960 with Pye to become British Electronic Industries Ltd, which was purchased by Dutch firm Philips in 1967, with the EKCO brand disappearing from brown goods during the 1970s.
Medical applications of radio frequency (RF) energy, in the form of electromagnetic waves (radio waves) or electrical currents, have existed for over 125 years, [9] and now include diathermy, hyperthermy treatment of cancer, electrosurgery scalpels used to cut and cauterize in operations, and radiofrequency ablation. [10]
The FCC has restricted the frequencies allowed for medical treatment, and most machines in the US use 27.12 MHz. [26] Shortwave diathermy can be applied in either continuous or pulsed mode. The latter came to prominence because the continuous mode produced too much heating too rapidly, making patients uncomfortable.
The company was established in 2001, originally as a spin-off of Fraunhofer USA's Center for Laser Technology (CLT), Plymouth, Michigan. [2] [3] Today, it is a privately held, woman-owned business that works together with its research and development partner, Fraunhofer USA, on various projects to create new laser applications and laser sources for direct materials processing, research ...
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