ABSTRACT
The samples of hydroxyapatite and carbonate substituted hydroxyapatite (CHA) were obtained under the influence of physical factors, namely ultrasound (US) and microwave (MW) radiations. The results of Fourier transform infrared spectroscopy and X-ray diffraction analysis have proved the formation of the calcium deficient hydroxyapatite and B-type CHA with the Ca/P ratio in the ranges 1.62-1.87. In vitro studies have showed the increased bioactivity of the samples, synthesized under the influence of physical factors as compared to the standard ones. The samples of both groups, synthesized under the influence of 600â¯Wâ¯MW, have shown the greatest stability in biological environment. In vivo tests confirm that obtained under US and MW radiations hydroxyapatite-based biomaterials are biocompatible, non-toxic and exhibit osteoconductive properties. The usage of US and MW radiations can significantly shorten the time (up to 5-20â¯min) of obtaining of calcium deficient hydroxyapatite and B-type CHA in nanopowder form, close in structure and composition to the biological hydroxyapatite.
Subject(s)
Apatites/chemistry , Durapatite/chemistry , Microwaves , Nanostructures/chemistry , Ultrasonic WavesABSTRACT
In 116 patients with renal colic, caused by stones of ureters, conservative treatment with application of hyperbaric oxygenation (HBO) was conducted. Under the influence of oxygenotherapy during 3 days obstruction of the urinary tracts in all patients had disappeared as well as acute urostasis, clinic symptoms of the renal colic, progress of an acute infectious-inflammatory process stopped, complications were eliminated. Echo-positive subjects had disappeared from kidneys, in one patient renal calculus had dissolved, in 5--calculi had reduced in size and fragmentated, in 9--had not changed. In 108 patients the ureters had freed from calculi, in 8--calculi had reduced in size and migrated in distal direction.
