Occupational Diseases / / May 12, 2016
Ultrasound - mechanical vibrations of an elastic medium, the frequency of which is greater than 16-20 kHz, not perceived by the human ear.
Ultrasound is widely used in industry and agriculture (cutting, drilling, welding of different metals, the surface cleaning products from impurities, ultrasonic inspection methods and others.), And in medicine (for diagnosis and therapy of some diseases).In addition, ultrasound is generated by the high-power industrial installations (turbine jet engines and al.).
most characteristic ultrasonic frequency encountered in industrial environments, are in a range from 20 to 70 kHz.
occurs and high frequency noise, with the result that clinical data is generally interpreted as a consequence of the combined effects on the body both of these factors when the ultrasound equipment.Ultrasound has an impact on the body work by contact in contact with the working fluid hand tools or parts.Some authors suggest the possibility of the influence of ultrasonic vibrations on the bo
for action of ultrasound is most characteristic of damage to the nervous system.Those long serving ultrasound equipment, complain of headache, general weakness, sleep disorders, irritability, memory loss, increased sensitivity to sounds, feeling of fullness in the ears, sometimes cold extremities, seizures, pallor, or, conversely, facial flushing, fainting.Frequent complaints of dyspeptic character.In a clinical study notes or asthenovegetative asthenic syndrome.Sometimes there diencephalic disorders (weight loss, low-grade fever, paroxysmal attacks of the type of visceral crises, hallucinations).It occurs scattered organic mikrosimptomatika, detected cases of thyroid dysfunction and sexual glands, the adrenal cortex.
observed decrease in the perception of high and sometimes low tone, inhibition of vestibular excitability.Ultrasound causes autonomic or vegetative-sensitive polyneuritis (cyanosis, pasty, hyperkeratosis, reducing surface sensitivity in the distal parts of the hand).
observed phenomenon neuro dystonia (complaints of pain in the heart, the tendency to bradycardia and hypotension, with electrocardiography - bradysystole, violation intraatrial and intraventricular conduction).In the blood - monocytosis, eosinophilia, in the future - hypoeosinophilia.Often - decrease in blood sugar, sugar-type two-humped curve, reduced vitamin saturation.The symptoms are mostly unstable character.
There are 3 stages of the changes caused by the influence of ultrasound:
initial (functional changes in the nervous system, endocrine changes, vestibular disorders, vegetative polyneuritis - all changes expressed mild);
moderate severity (the same changes in a more pronounced form, diencephalic violations unsharp degree);
Expressed (diencephalic crises, light scattered symptoms of an organic lesion of the central nervous system).
Treatment Treatment is symptomatic and restorative.
disability If you have a mild expressed phenomena of asthenia and vegetative-vascular changes disabled preserved.It should be dynamic observation and outpatient treatment;direction in the dispensary, night sanatorium, rest home, health resort.In some cases - temporary (1-2 months) on translation work, excluding the impact of ultrasound.With the development of persistent and pronounced neurocirculatory and neurodynamic disorders, hearing and vestibular apparatus, along with appropriate treatment on an outpatient or inpatient setting, it is recommended constant rational employment.
ultrasound equipment as much as possible should be located in isolated areas.It is necessary to drastically reduce (if possible to completely eliminate) the contact of hands with detergent liquid in ultrasonic baths, with the tool at the time of passage of ultrasonic vibrations on it.Loading and unloading of parts must be carried out when the generator is switched off ultrasound.When working on machines and machine parts must be secured with the help of special tools.Working hands must be protected by two-layer gloves: external - rubber and internal - cotton.
09 Jun, 2016