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Biomedical subjects

A G Schuring

Publications and source records attributed to A G Schuring.

50 records · Page 3Linked to original sources
PubMed1983

Stapedectomy revision of the wire-Gelfoam prosthesis.

Revision procedures in which a vein graft with a Robinson stapes prosthesis was used are reviewed in 100 patients. In all cases a wire-Gelfoam stapes prosthesis had been used initially. The surgical findings were prosthesis malfunction, 48%; eroded incus, 16%; negative findings, 14%; footplate not removed, 11%; oval window fistula, 7%; and incus problems, 4%. Postoperatively, hearing in 70.5% of the patients with conductive hearing loss was within 10 dB and 84.5% within 20 dB. The high success rate is affected by the fact that patients with conductive hearing loss were separated from those with sensorineural hearing loss, a piston prosthesis on tissue was used in the revision surgical procedure, and patients with otosclerosis regrowth did not undergo revision. Surgical directives to minimize hearing loss included use of a tissue seal over the oval window; not reopening the oval window; monitoring the patient for dizziness; performing audiometric tests during surgery; leaving the wire in place in certain cases; and not revising the prosthesis in patients with otosclerosis regrowth.

Adolescent↗
PubMed1983

Solving ossicular problems in stapedectomy.

Three unusual ossicular problems encountered in stapedectomy are: floating stapes footplate, partial absence of the incus long process, and otosclerosis combined with a fixed malleus. The surgical techniques advocated in solving these problems are: placing a Robinson prosthesis on the floating footplate, utilizing the Lippy modification of the Robinson prosthesis for the problem incus, and performing only a stapedectomy for malleus fixation and otosclerosis. The hearing results in 242 cases were quite satisfactory and no patient had a further sensorineural loss.

Ear Ossicles↗
PubMed1983

Solving ossicular problems in tympanoplasty.

Four troublesome problems encountered in ossicular reconstruction are: low profile stapes, lateral tympanic membrane, remaining stapes crura, and absent stapes capitulum. The design advantages and modifications of the semibiological ossicle cup and ossicle columella prostheses are given to solve these problems. The hearing results are completely satisfactory.

Ear Ossicles↗
PubMed1978

Stapedectomy for otosclerosis with malleus fixation.

Malleus fixation, in addition to stapes fixation, presents a perplexing surgical problem. Should the incus replacement prosthesis procedure be performed or only a stapedectomy? The hearing results of a stapedectomy alone in 45 cases with both stapes and malleus fixation are 70% within 10 dB and 84% within 20 dB of the preoperative bone conduction hearing level.

Bone Conduction↗
PubMed1978

An incus replacement prosthesis. The ossicle cup.

To achieve better hearing after incus replacement surgery, the ossicle-cup prosthesis is introduced. This prosthesis incorporates part of a Teflon Robinson's stapes prosthesis into the body of an incus. The ossicle-cup prosthesis has a dynamic joint with the stapes capitulum, as well as a variable height above the stapes. Preliminary hearing results of 45 cases show air-bone gap closure of 67% within 10 dB and 98% within 20 dB.

Ear Ossicles↗
PubMed1975

Incus window in transposition.

In aiding the positioning of the incus in incus transposition, a hole, the incus window, is drilled completely through the body of the incus. Through the window the surgeon has a visual as well as a tactile reference to the head of the stapes. At one year results show that 182 of 201 patients closed the air-bone gap to within 20 dB of the preoperative bone level.

Bone Transplantation↗
PubMedDate not supplied

Semibiologic middle ear prostheses: ossicle cup and ossicle columella.

As a natural step in ossicular reconstruction technique, two semibiologic prostheses are introduced. The prosthesis designed for incus replacement is called the "ossicle cup." A hole is drilled in the body of an incus or head of the malleus, and the synthetic shaft of the ossicle cup is placed into the hole. The synthetic cup fits over the stapes capitulum, forming a joint. The ossicle keeps the synthetic portion from touching the tympanic membrane. The prosthesis designed for total ossicular replacement is called the "ossicle columella." In like manner, the shaft is inserted into a shaped ossicle and placed on the remaining footplate. The ossicle columella has a synthetic footplate that rests on the remaining footplate and provides stability and safety. The adaptability of the semibiologic prostheses solves the problems of a laterally healed tympanic membrane, absent stapes capitulum, remaining footplate crura, low-lying stapes, and retracted malleus. The hearing results of the ossicle cup prosthesis indicate 87% of cases with successful hearing at one year. The ossicle columella results in 71% of cases with successful hearing at one year. To date, the extrusion rate is less than 1%.

Bioprosthesis↗