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At least 919 records · Page 51Linked to original sources
PubMed1993

Impedance transfer: acoustic impedance of the annular ligament and stapedial tendon reconstruction in otosclerosis surgery.

The resistance rebuilt around the lower tip of the piston must be the same as that created by the annular ligament of the stapes footplate. Otherwise, the threshold at which an acoustic or barotrauma is able to damage the membranes and hair cells of the inner ear will be lowered. The elasticity reestablished around the lower tip of the piston plays a part in the quality and quantity of hearing for the low frequencies up to 3 kHz. To protect the ear against acoustic traumas, an attempt to rebuild the stapedial reflex is proposed.

Acoustic Impedance Tests↗
PubMed1998

A personal history of stapedectomy.

Aristotle has said the essential ingredient of tragedy is first hubris. Fame leads to the hubris that offends the gods, who send great punishment. This is so true in the history of stapedectomy. The three distinct eras of surgery for otosclerosis teach us a lot about what happens in science and in life. The first stapes era began in Europe, ahead of its time, and in those halcyon days before the turn of the century, the Belle Epoch, proceeded, uncorrected to its tragic extreme, and then was stopped suddenly, quite rightly, by the establishment. The fenestration era proceeded to an extreme, when its technical master Julius Lempert would allow no criticism or improvement in "his" one-stage endaural technique, however good, nor would he accept the new mobilization and stapedectomy operations, and he and it ended badly. The fact that Jenkins and Holmgren would make an opening in the lateral semicircular canal and then close it in the epitympanum, not open to the ear canal, to expect to improve hearing is amazing. Until Sourdille went to Stockholm and saw one closed fenestration operation performed by Holmgren and devised his "open to the ear canal technique," the closed fenestration operation was not reasonable. Then Sourdille came to New York City, and Lempert heard him speak and read and reread his publication and greatly improved on his operation. It was Lempert's one-stage endaural open operation that gave the fenestration operation the worldwide acceptance it gained. The second stapedectomy era began before the fenestration era ended with the accidental and originally unrecognized mobilization of the stapes by Rosen and my resurrection of stapedectomy. I realized in reading the literature of the past that stapedectomy was not necessarily fatal to the ear or the patient as was generally believed, and what was needed was to seal the oval window with a living elastic membrane and reconstruct the sound-conducting mechanism of the middle ear with a biocompatible implant prosthesis to make it successful. But for me, in 1955-1956, the "Zeitgeist" was finally right. I realized the stapes could be removed and covered the oval window with a vein graft, and Harry Treace made me a biocompatible implant prosthesis out of the newly discovered Teflon. For a new technology to be accepted, it must be much better than what it replaces, and stapedectomy was much better than fenestration. In the new microsurgical era of otology that began, improvements in the stapedectomy operation came from everywhere and were readily accepted. Stapedectomy has now become so successful, like many treatments in medicine, the problem has now largely disappeared. If the measles virus is the cause of the growth of the otosclerotic focus, as it seems to be, then vaccination against measles eventually will eliminate the hearing loss of otosclerosis completely. What the history of stapedectomy reveals is the truth of the quotation from Ecclesiastes, "There is nothing new under the sun." Progress is only made when the Zeitgeist is right, by someone who puts together the truths of the past with the new discoveries of the present.

Ear Diseases↗
PubMed1990

Argon laser stapedectomy using an endo-otoprobe system.

In summary, we believe that the endo-otoprobe system offers several advantages to the otologist. The system is safe and relatively inexpensive. The probes are designed to provide tactile feedback similar to that of standard otologic instruments and avoid the use of a cumbersome micromanipulator. There are currently shapes that are similar to a Rosen needle, Shea pick, and bayonet. We hope most otologists will find that one of the endo-otoprobes fits their particular style of surgery.

Humans↗
PubMed1979

Hypermobility of the incudostapedial joint: a clinical entity.

During exploratory tympanotomy for conductive deafness, the surgeon is occasionally perplexed to find no apparent cause for the air-bone gap. This unexplained deafness has been called "inner ear conductive hearing less" because of the apparent absence of pathology in the middle ear. The incudostapedial joint was studied in 68 vertically sectioned temporal bones and the anatomy is presented. Varying amounts of laxity is observed in the normal joint capsule at the time of surgery. A theory is suggested in which an elongated capsule allows incus motion without energy transmission to the stapes. It is proposed that hypermobility of the incudostapedial joint may exist and explain conductive hearing loss of undetermined etiology.

Audiometry↗
PubMed2004

The potential of robotic technology applied to meet requirements for tools to support microsurgery and cellular surgery.

Microsurgery and processes involving cell manipulation or cell surgery are clinical practices where the operator works at or beyond the threshold of human dexterity. Current tools available are conventional in their design, and this limits consistency and the level of reliability and achievement. Surgical robotic devices have been explored to improve precision in minimal access surgical procedures to augment control of tool points in tissues, and have enabled feedback of sensory data from which the operator is able to deduce information on the tool at the working site. In this paper, relevant technologies are described that can be harnessed to improve perception of tool point interaction with tissues at the working site and to improve tool control at the small scale required in clinical practice for microsurgery and for cell surgery.

Humans↗