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Results for “Ear Protective Devices”

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At least 19 recordsLinked to original sources
PubMed1978

[Effectiveness of ear protective devices].

Efficiency of 9 types of hearing protectors was investigated. A subjective method of an absolute hearing threshold shift in free sound field in 20 well-hearing-persons was applied. The results obtained are presented in figures. It was found that the maximum efficiency of most hearing protectors usually fell toon the frequency of 4000 Hz and amounted to 20--41 dB. The minimum efficiency usually fell to the frequency of 125 Hz and amounted to 8--21 dB. Attenuation efficiency of broad-band noise was 18-40 dB and approximated the maximum efficiency of pure sounds, sometimes even surpassing it. The results of determinations differed from the values given by manufacturers, which accounts for the need of undertaking such investigations.

Ear Protective Devices↗
PubMedDate not supplied

A pressure prevention device for burned ears.

Full-thickness burns to the external ear can produce loss of skin and cartilage and can result in severe cosmetic deformity. Even partial-thickness burns render the ear vulnerable to tissue loss if the helix is subjected to pressure from pillows, dressings, or straps that are used to secure endotracheal tubes. Because of the incidence of burned ear deformities and the difficulty in reconstructing the external ear, an ear protection device has been designed. The bilateral ear protection device, referred to as "headgear", is fitted to all patients in the burn center who require intubation for an inhalation injury; it is worn continuously until extubation. During a 15-month period 39 consecutive critically burned patients were fitted with the headgear because of the need for ventilator support and/or for protection of the burned ear(s). Pressure necrosis of ear tissue was prevented in all 33 survivors.

Burns↗
PubMed1977

Tympanostomy tube protection with ear plugs.

Protection by ear plugs from water-borne infection was evaluated in 35 patients with "tympanostomy" tubes, tympanic membrane perforations, or mastoid bowls. Stock and custom-made ear plugs were found to be equally effective up to four months during a period of frequent swimming and bathing activities. Infections were only noted to occur in those patients who did not follow instructions on appropriate use of the plugs.

Adolescent↗
PubMed1975

Neurogenic concept of bell's palsy. Medical decompression of facial nerve.

According to the author it is the 'transmyringal' portion of the chorda tympani nerve which in practice remains exposed to the cold atmospheric air and triggers the pathologic process involved in Bell's palsy, affecting the facial nerve secondarily, rather than a primary condition of the facial nerve. This theory was proved by creating a Bell's palsy (paralysis a frigore) with cold-air-stimuli to the tympanic membrane in experimental animals (two monkeys). On the basis of this observation the author recommend's 'medical decompression' of the facial nerve by means of infra-red fomentation of the drum, and eustachian insufflation of hydrocortisone, in cases of Bell's palsy before retrograde extension of oedema from the chorda tympani to the facial nerve can cause irreversible damage. Subsequently, the author has successfully managed fourteen cases (93-4 per cent) of Bell's palsy with a definite history of exposure to cold (paralysis a frigore). It is suggested that the ear canal be plugged with cotton as a preventive measure; and that chorda tympani neurectomy be performed to eliminate the chances of recurrence of the disease in cases of recurrent Bell's palsy.

Animals↗
PubMed1991

Blast criteria for open spaces and enclosures.

A review of the history of blast research is presented from before World War II to the present time. The mechanisms of blast injury and the nature of the injuries are described. Casualty criteria applicable to man's exposure to single blasts in open terrain as a function of overpressure duration and orientation are given. Damage-risk criteria for man exposed to repeated blasts of low and high intensity are described. The hazards from blast waves entering open structures are described with criteria for personnel located in a standard two-man open foxhole. Methods of establishing the air blast dose in a variety of exposure conditions are illustrated. The present state-of-the-art on personnel protection afforded by rigid and soft protective garments is given. Information on animal response to blast waves generated inside enclosures from the firing of recoilless weapons and the detonation of high-explosive charges is discussed along with the problem of defining the extent of performance decrement in relation to the air blast dose.

Acoustic Stimulation↗
PubMed1977

Traumatic thermal injuries of the middle ear.

Eleven cases of thermal otic injury are reviewed. The final outcome of therapy, whether medical or surgical is poor--only two of 11 patients were restored to normal. The possible pathogenesis of failure is discussed. Most cases could have been prevented by wearing ear plugs.

Accidents, Occupational↗
PubMed1990

Swimming and ear infection.

Surface swimming in fresh or ocean water is not contraindicated in children with otitis media or in children with tympanostomy tubes. Diving should be prohibited in children with acute or chronic otitis media or in children with tympanostomy tubes. Hot tub water, bath water, chlorinated water, or water from stagnant ponds may pose a risk for either otitis media or otitis externa.

Child↗
PubMedDate not supplied

A direct method of earplug fabrication.

Otitis media is one of the most common diseases of childhood, accounting for a large percentage of office visits during the first five years of life. Eight specific signs and symptoms are associated with otitis media and its complications and sequelae. Ear plugs in a variety of sizes are often used to prevent water from entering the middle ear when tympanotomy tubes are in place. A fabrication technique is described.

Child↗