Nitinol-Teflon Stapes Prosthesis Improves Low-Frequency Hearing Results After Stapedotomy

2010 ◽  
Vol 31 (7) ◽  
pp. 1022-1026 ◽  
Author(s):  
Charles A. Mangham
Keyword(s):  
Low Frequency ◽  
Hearing Results ◽  
Stapes Prosthesis

Long-Term Experience with Biocompatible Ossicular Implants

1986 ◽  
Vol 94 (6) ◽  
pp. 611-616 ◽  
Author(s):  
John R. Emmett ◽  
John J. Shea ◽  
William H. Moretz
Keyword(s):  
Chronic Otitis Media ◽  
Hearing Results ◽  
Common Causes ◽  
Ossicular Replacement ◽  
Stapes Prosthesis ◽  
Short And Long Term ◽  
Conductive Hearing ◽  
Long Term Experience

The senior author's 8-year personal experience with biocompatible ossicular implants is reviewed. Four hundred sixty-one consecutive operations, in which high-density polyethylene sponge ossicular replacement prostheses were used, are grouped according to the Bellucci classification of chronic otitis media. The prostheses used were the drum-to-footplate prosthesis (TORP, total) and the drum-to-stapes prosthesis (PORP, partial)*. Each group's short- and long-term hearing results are compared. Prosthesis extrusion and persistent or recurrent conductive hearing loss are the most common causes of operation failure. Failures within each group are analyzed, and techniques to prevent these complications are outlined.

Task Performance in Stapedotomy: Comparison Between Surgeons of Different Experience Levels

2003 ◽  
Vol 128 (1) ◽  
pp. 71-77 ◽  
Author(s):  
Daniel L. Rothbaum ◽  
Jaydeep Roy ◽  
Gregory D. Hager ◽  
Russell H. Taylor ◽  
Louis L. Whitcomb ◽  
...  
Keyword(s):  
Task Performance ◽  
Clinical Significance ◽  
Hearing Results ◽  
Surgical Model ◽  
Experience Levels ◽  
Stapes Footplate ◽  
Stapes Prosthesis ◽  
Quality Movement ◽  
Novice Surgeons

OBJECTIVES: Two steps in stapedotomy are particularly challenging: (1) micropick fenestration of the stapes footplate (SF) and (2) crimping of the stapes prosthesis (SP) to the incus. We conducted trials to determine if experience correlates with differences in performance for these tasks. METHODS: In a surgical model of stapedotomy, performance was measured for 3 experienced and 3 novice surgeons. For fenestration, we measured ability to target the fenestration and force applied to the SF. For crimping, we measured crimp quality, movement of the SP during crimping, and force applied to the SF. RESULTS: Experienced surgeons demonstrated significantly better ability to target the fenestration and, during crimping, caused less SP movement and a significantly lower rate of SP dislodgment. CONCLUSIONS: Clear differences in task performance are measurable between more and less experienced surgeons during critical steps of stapedotomy. CLINICAL SIGNIFICANCE: The observed differences in task performance may contribute to an understanding of maneuvers that increase the risk of inadequate prosthesis placement and cochlear trauma—factors likely responsible for variable hearing results with strapedotomy.

Retrospective Analysis of Outcomes after Stapedotomy with Implantation of a Self-Crimping Nitinol Stapes Prosthesis

2007 ◽  
Vol 137 (1) ◽  
pp. 65-69 ◽  
Author(s):  
Abraham J. Sorom ◽  
Colin L.W. Driscoll ◽  
Charles W. Beatty ◽  
Larry Lundy
Keyword(s):  
Bone Conduction ◽  
The Self ◽  
Short Term ◽  
Hearing Results ◽  
Intermediate Group ◽  
Stapes Fixation ◽  
Academic Hospitals ◽  
Stapes Prosthesis ◽  
The Mean

OBJECTIVE: To review hearing results after implantation of a self-crimping stapes prosthesis. STUDY DESIGN AND SETTING: Analysis of hearing results in patients implanted with a self-crimping stapes prosthesis at two academic hospitals from 2000 to 2004. RESULTS: Seventy-nine ears were divided into short-term and intermediate follow-up groups. The mean postoperative air-bone gap (ABG), preoperative minus postoperative ABG, and preoperative minus postoperative bone conduction values were 5.7, 21.4, and 4.1 dB, respectively, for the short-term group, and 6.3, 22.3, and 4.7dB, respectively, for the intermediate group. The ABG was <10 dB in 88 percent of the short-term group and in 79 percent of the intermediate group. CONCLUSIONS: The self-crimping Nitinol stapes prosthesis provides excellent short-term and intermediate postoperative hearing results, and may overcome the limitations of stapes prostheses requiring manual crimping. SIGNIFICANCE: This paper provides evidence for the use of a self-crimping Nitinol stapes prosthesis, which may simplify hearing restoration surgery for stapes fixation.

Five-year hearing results with the shape memory nitinol stapes prosthesis

2014 ◽  
Vol 124 (11) ◽  
pp. 2591-2593 ◽  
Author(s):  
Jeremy Lavy ◽  
Sherif Khalil
Keyword(s):  
Shape Memory ◽  
Hearing Results ◽  
Stapes Prosthesis

Long-Term Experience with Biocompatible Ossicular Implants

1986 ◽  
Vol 94 (5) ◽  
pp. 611-616 ◽  
Author(s):  
John R. Emmett ◽  
John J. Shea ◽  
William H. Moretz
Keyword(s):  
Chronic Otitis Media ◽  
Hearing Results ◽  
Common Causes ◽  
Ossicular Replacement ◽  
Stapes Prosthesis ◽  
Short And Long Term ◽  
Conductive Hearing ◽  
Long Term Experience

The senior author's 8-year personal experience with biocompatible ossicular implants is reviewed. Four hundred sixty-one consecutive operations, in which high-density polyethylene sponge ossicular replacement prostheses were used, are grouped according to the Bellucci classification of chronic otitis media. The prostheses used were the drum-to-footplate prosthesis (TORP, total) and the drum-to-stapes prosthesis (PORP, partial) * . Each group's short- and long-term hearing results are compared. Prosthesis extrusion and persistent or recurrent conductive hearing loss are the most common causes of operation failure. Failures within each group are analyzed, and techniques to prevent these complications are outlined.

A Study on the Fine Structure of the Lateral Line Organ of the Sea Eel

1973 ◽  
Vol 31 ◽  
pp. 648-649
Author(s):  
K. Hama
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Lateral Line ◽  
Low Frequency ◽  
Sensory Cells ◽  
Apical Surface ◽  
Voltage Electron ◽  
Sensory Epithelia ◽  
Low Frequency Vibration ◽  
Transmission Electron

The lateral line organs of the sea eel consist of canal and pit organs which are different in function. The former is a low frequency vibration detector whereas the latter functions as an ion receptor as well as a mechano receptor.The fine structure of the sensory epithelia of both organs were studied by means of ordinary transmission electron microscope, high voltage electron microscope and of surface scanning electron microscope.The sensory cells of the canal organ are polarized in front-caudal direction and those of the pit organ are polarized in dorso-ventral direction. The sensory epithelia of both organs have thinner surface coats compared to the surrounding ordinary epithelial cells, which have very thick fuzzy coatings on the apical surface.

Lectin Binding to Human Breast Tumor Cells

1976 ◽  
Vol 34 ◽  
pp. 34-35
Author(s):  
Robert E. Nordquist ◽  
J. Hill Anglin ◽  
Michael P. Lerner
Keyword(s):  
Carcinoma Cell ◽  
Ricinus Communis ◽  
Lectin Binding ◽  
Low Frequency ◽  
Breast Carcinoma Cell Line ◽  
Human Breast ◽  
Human Breast Tumor ◽  
Duct Carcinoma ◽  
Specific Antigens ◽  
Ricin Agglutinin

A human breast carcinoma cell line (BOT-2) was derived from an infiltrating duct carcinoma (1). These cells were shown to have antigens that selectively bound antibodies from breast cancer patient sera (2). Furthermore, these tumor specific antigens could be removed from the living cells by low frequency sonication and have been partially characterized (3). These proteins have been shown to be around 100,000 MW and contain approximately 6% hexose and hexosamines. However, only the hexosamines appear to be available for lectin binding. This study was designed to use Concanavalin A (Con A) and Ricinus Communis (Ricin) agglutinin for the topagraphical localization of D-mannopyranosyl or glucopyranosyl and D-galactopyranosyl or DN- acetyl glactopyranosyl configurations on BOT-2 cell surfaces.

Practical High Resolution Microscopy

1968 ◽  
Vol 26 ◽  
pp. 302-303
Author(s):  
P. A. Marsh ◽  
T. Mullens ◽  
D. Price
Keyword(s):  
High Resolution ◽  
Magnetic Fields ◽  
Low Frequency ◽  
Resolving Power ◽  
Careful Attention ◽  
Electron Microscopes ◽  
The Relationship ◽  
High Resolution Microscopy ◽  
New Facilities

It is possible to exceed the guaranteed resolution on most electron microscopes by careful attention to microscope parameters essential for high resolution work. While our experience is related to a Philips EM-200, we hope that some of these comments will apply to all electron microscopes.The first considerations are vibration and magnetic fields. These are usually measured at the pre-installation survey and must be within specifications. It has been our experience, however, that these factors can be greatly influenced by the new facilities and therefore must be rechecked after the installation is completed. The relationship between the resolving power of an EM-200 and the maximum tolerable low frequency interference fields in milli-Oerstedt is 10 Å - 1.9, 8 Å - 1.4, 6 Å - 0.8.

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