Oscar Söderberg

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The rat eustachian tube (ET), from the nasopharyngeal orifice to the tympanal orifice, is about 4.5 mm long, of which the naso-medial membranous part (the nasopharyngeal orifice) measures about 1.5 mm and the occipito-lateral bony portion about 3 mm. The nasopharyngeal orifice is surrounded by two soft, lip-like, mucosal swellings--one ventral and one(More)
In order to examine whether a myringotomy made with a CO2-laser might be alternative to a ventilation tube, a perforation was made in the upper rear quadrant bilaterally, of 22 rats. The laser-made perforations showed a delayed healing pattern, about twice the closing time of a similar-sized perforation made with a myringotomy lancet. Serous effusion was(More)
In 1996 a telemedicine link was established between two primary-care centres of Västerbotten county and the University Hospital. Specialties involved at the University Hospital were otoloaryngology, orthopaedics and dermatology. Videoconferencing used ISDN at 384 kbit/s. The primary-care centres were equipped with video-endoscopes. During the first 21(More)
Topical application of hyaluronic acid (Healon) onto the borders of rat tympanic membrane perforations accelerated the rate of wound healing. The closure time was roughly 60% of that of the untreated perforations. Epithelial cells fused with opposing cells slightly in advance of supporting connective tissue and thus bridged the remaining gap. It seems as if(More)
A controlled randomized study was performed in 60 patients with 64 chronic, dry tympanic membrane (TM) perforations. The perforations were randomly allocated to either resection of the perforation rim and instillation of 1% hyaluronan (Healon; HYA) in the perforation gap once daily for 7 days (33 ears) or resection of the perforation margin and application(More)
Stapedectomy and stapedotomy are the techniques currently used in the surgical treatment of otosclerosis. During the period 1977-81, a total of 60 consecutive patients were subjected to surgery for otosclerosis according to the method of Schuknecht (Gelfoam and wire prosthesis). Another 55 consecutive otosclerotic patients were operated on during(More)
In adult Sprague-Dawley rats a dysfunction or a total blockade of the Eustachian tube was established by various experimental procedures. The appearance of effusion material in the attic was subsequently considered to be evidence of incomplete ventilation of the middle ear cavity. Though the salpingopharyngeus muscle (SPM) seemed to be the muscle which(More)
In an animal model (rat) a polyethylene tympanostomy tube was repeatedly inserted (four periods lasting 2 weeks) into the upper rear quadrant of the right tympanic membrane (TM). The intervals between the different tubulation periods (TPs) lasted 3 weeks. The corresponding quadrant of the left TM was subjected to repeated myringotomies (four times). The(More)