| Nitinol-teflon stapes prosthesis improves low-frequency hearing results after stapedotomy. | |
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MedLine Citation:
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PMID: 20657332 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To determine if nitinol-Teflon shape-memory stapes prostheses offer a hearing result advantage compared with platinum-Teflon pistons that must be manually crimped. STUDY DESIGN: Retrospective chart review. PATIENTS: One hundred eighty-eight consecutive ears with either a platinum or a nitinol piston and primary stapes surgery between 1998 and 2009. SETTING: Subspecialty private practice. INTERVENTION: One hundred forty-four ears received a platinum 0.6-mm-diameter piston, and 44 ears received a nitinol 0.6-mm-diameter piston. MAIN OUTCOME MEASURES: American Academy of Otolaryngology-Head and Neck Surgery guidelines, including 4-frequency pure-tone average air-bone (AB) gap, and success (gap <or= 10 dB) rate. RESULTS: Success at closing the AB gap was comparable for both groups (platinum, 96%; nitinol, 92%; p = not significant). The nitinol group had significantly smaller mean AB gaps in the lower frequencies (at 250 Hz, 9.3 versus 15.4 dB and at 500 Hz, 1.9 versus 5.0 dB; p's < 0.01), but not at 1, 2 or 4 kHz. The highly malleable platinum loop was adaptable to various incus diameters and was easy to crimp. The 360-degree circumferential version of the nitinol prosthesis may adapt to various incus diameters better than the original version (minimum heat-crimped diameter, 0.70 versus 0.76 mm). In some cases, both nitinol versions were difficult to crimp using only a laser, and a manual crimp was also required. CONCLUSION: The nitinol stapes prostheses failed to live up to claims of consistent ease of crimping; however, the significantly better low-frequency hearing results justify an effort to make the devices more user friendly. |
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Authors:
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Charles A Mangham |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology Volume: 31 ISSN: 1537-4505 ISO Abbreviation: Otol. Neurotol. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-25 Completed Date: 2010-12-16 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100961504 Medline TA: Otol Neurotol Country: United States |
Other Details:
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Languages: eng Pagination: 1022-6 Citation Subset: IM |
Affiliation:
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Seattle Ear Clinic, Seattle, Washington 98122-4328, U.S.A. chasmangham21@msn.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Alloys Biocompatible Materials Bone Conduction / physiology Cochlear Implantation Cochlear Implants* Follow-Up Studies Hearing / physiology* Humans Platinum Polytetrafluoroethylene Retrospective Studies Stapes Surgery* Treatment Outcome |
| Chemical | |
Reg. No./Substance:
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0/Alloys; 0/Biocompatible Materials; 52013-44-2/nitinol; 7440-06-4/Platinum; 9002-84-0/Polytetrafluoroethylene |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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