title: [Clotting induction in the mesenterium and erosive stomach mucosa in wistar rats as the result of a catenoidal ultrasonic transducer].
abstract: The ultrasonic transducers and instruments used in surgery operate in the range of 1-10 MHz and release significant heat in the surroundings. They need additional cooling system which significantly raises the cost and impedes the equipment operation. Hemostasis can be successfully achieved by employing ultrasonic transducers that operate in the kilohertz range, avoiding the occurrence of inadmissible tissue overheat outside the area of the transducer performance. The paper presents results of the approbation of the effect of a periodical acoustic signal with frequency of 60 kHz over the erosive stomach mucosa and mesenterium of 28 rats, "Wistar" breed, and the period of tissue exposure is 1-10 min. A transducer-catenoidal semi-wave concentrator that provides maximum emitted power of the ultrasonic wave is used and thermal effects are avoided. It is proved that the use of a powerful and localized ultrasonic signal results in erythrocyte diapedesis and forms microhaemorrhagies together with an out-vessel coagulation in the rat stomach mucosa The tissue damages are strictly limited within the area of the emitter contact and they are subject to control during the ultrasonic performance.
authors.forename: E
authors.initials: E
authors.lastname: Lakova
authors.forename: G
authors.initials: G
authors.lastname: Georgiev
authors.forename: M
authors.initials: M
authors.lastname: Nikolova
authors.forename: R
authors.initials: R
authors.lastname: Nachev
authors.forename: A
authors.initials: A
authors.lastname: Stoianova
authors.forename: A
authors.initials: A
authors.lastname: Dimitrova
authors.forename: D
authors.initials: D
authors.lastname: Strashimirov
authors.forename: A
authors.initials: A
authors.lastname: Aleksiev
authors.forename: M
authors.initials: M
authors.lastname: Mikhovski
mesh_terms: D000818:Animals; D001777:Blood Coagulation / Q000528:radiation effects*; D006470:Hemorrhage / Q000097:blood / Q000628:therapy*; D008643:Mesentery / Q000098:blood supply / Q000528:radiation effects*; D051381:Rats; D017208:Rats, Wistar; D013272:Stomach Diseases / Q000097:blood / Q000628:therapy*; D013997:Time Factors; D014159:Transducers; D014464:Ultrasonic Therapy / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods