HapticV1, Main, Exploration, bibRecordById, pubmed:12106733

Loop memory of haptic materials in posterior chamber intraocular lenses

Identifieur interne : 007356 ( Main/Exploration ); précédent : 007355; suivant : 007357

Loop memory of haptic materials in posterior chamber intraocular lenses

Auteurs : Andrea M. Izak [États-Unis] ; Liliana Werner [États-Unis] ; David J. Apple [États-Unis] ; Tamer A. Macky [États-Unis] ; Rupal H. Trivedi [États-Unis] ; Suresh K. Pandey [États-Unis]

Source :

Journal of cataract and refractive surgery [ 0886-3350 ] ; 2002.

RBID : Pascal:02-0421668

Descripteurs français

Pascal (Inist)
- Lentille intraoculaire, Implantation, Chambre postérieure, Méthacrylate de méthyle polymère, Biomatériau, Intraoculaire, Equipement, Fixation, Etude comparative, Homme.
Wicri :
- topic : Biomatériau, Homme.

English descriptors

KwdEn :
- Biomaterial, Comparative study, Equipment, Fixation, Human, Implantation, Intraocular, Intraocular lens, Lenses, Intraocular, Methyl methacrylate polymer, Nylons (chemistry), Polymethyl Methacrylate (chemistry), Polypropylenes (chemistry), Polyvinyls (chemistry), Posterior chamber, Prosthesis Design, Silicone Elastomers, Stress, Mechanical.
MESH :
- chemical , chemistry : Nylons, Polymethyl Methacrylate, Polypropylenes, Polyvinyls.
- Lenses, Intraocular, Prosthesis Design, Silicone Elastomers, Stress, Mechanical.

Abstract

Purpose: To compare the shape recovery ratios after compression of haptic materials used in the manufacture of intraocular lenses (IOLs). Setting: Center for Research on Ocular Therapeutics and Biodevices, Storm Eye Institute, Medical University of South Carolina, Charleston, South Carolina, USA. Methods: The loop memory of 40 silicone-optic posterior chamber lOLs was studied. All the lOLs had modified-C haptics made of poly(methyl methacrylate) (PMMA; n = 10), polyimide (n = 10), polyvinylidene fluoride (PVDF; n = 10), and polypropylene (PP; n = 10). After the overall diameter of each lens was measured (day 0), the lenses were inserted into plastic wells (9.5 mm in diameter) and immersed in water (37°C) for 1 month. They were then placed on an open plate and allowed to reexpand for 2 months. Overall diameter measurements were performed within 5 minutes of the lOLs' removal from the wells and at subsequent time points (days 14, 28, 30, 60, 74, 88, and 95). Results: The loop memory of each lens was expressed as the difference between the initial overall diameter measurement (pretest) and the measurement at each time point; the lower the value, the higher the memory. The overall difference among the 4 groups was statistically significant at each time point (P ≤.001). From days 30 to 95, silicone-PMMA, silicone-elastimide, and silicone-PVDF lOLs had similar loop memory mean values, which were significantly lower than the mean value of silicone-PP lOLs (P <.05). The latter design tended to be deformed after removal from the wells, with increased optic-haptic angulation. Conclusion: Studying the loop memory of haptic materials (PMMA, polyimide, PVDF, and PP) used in the manufacture of posterior chamber lOLs can help surgeons choose an appropriate IOL for each patient.

Affiliations:

Le document en format XML

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<series><title level="j" type="main">Journal of cataract and refractive surgery</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Biomaterial</term>
<term>Comparative study</term>
<term>Equipment</term>
<term>Fixation</term>
<term>Human</term>
<term>Implantation</term>
<term>Intraocular</term>
<term>Intraocular lens</term>
<term>Lenses, Intraocular</term>
<term>Methyl methacrylate polymer</term>
<term>Nylons (chemistry)</term>
<term>Polymethyl Methacrylate (chemistry)</term>
<term>Polypropylenes (chemistry)</term>
<term>Polyvinyls (chemistry)</term>
<term>Posterior chamber</term>
<term>Prosthesis Design</term>
<term>Silicone Elastomers</term>
<term>Stress, Mechanical</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Nylons</term>
<term>Polymethyl Methacrylate</term>
<term>Polypropylenes</term>
<term>Polyvinyls</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Lenses, Intraocular</term>
<term>Prosthesis Design</term>
<term>Silicone Elastomers</term>
<term>Stress, Mechanical</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Lentille intraoculaire</term>
<term>Implantation</term>
<term>Chambre postérieure</term>
<term>Méthacrylate de méthyle polymère</term>
<term>Biomatériau</term>
<term>Intraoculaire</term>
<term>Equipement</term>
<term>Fixation</term>
<term>Etude comparative</term>
<term>Homme</term>
</keywords>
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<term>Homme</term>
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<front><div type="abstract" xml:lang="en">Purpose: To compare the shape recovery ratios after compression of haptic materials used in the manufacture of intraocular lenses (IOLs). Setting: Center for Research on Ocular Therapeutics and Biodevices, Storm Eye Institute, Medical University of South Carolina, Charleston, South Carolina, USA. Methods: The loop memory of 40 silicone-optic posterior chamber lOLs was studied. All the lOLs had modified-C haptics made of poly(methyl methacrylate) (PMMA; n = 10), polyimide (n = 10), polyvinylidene fluoride (PVDF; n = 10), and polypropylene (PP; n = 10). After the overall diameter of each lens was measured (day 0), the lenses were inserted into plastic wells (9.5 mm in diameter) and immersed in water (37°C) for 1 month. They were then placed on an open plate and allowed to reexpand for 2 months. Overall diameter measurements were performed within 5 minutes of the lOLs' removal from the wells and at subsequent time points (days 14, 28, 30, 60, 74, 88, and 95). Results: The loop memory of each lens was expressed as the difference between the initial overall diameter measurement (pretest) and the measurement at each time point; the lower the value, the higher the memory. The overall difference among the 4 groups was statistically significant at each time point (P ≤.001). From days 30 to 95, silicone-PMMA, silicone-elastimide, and silicone-PVDF lOLs had similar loop memory mean values, which were significantly lower than the mean value of silicone-PP lOLs (P <.05). The latter design tended to be deformed after removal from the wells, with increased optic-haptic angulation. Conclusion: Studying the loop memory of haptic materials (PMMA, polyimide, PVDF, and PP) used in the manufacture of posterior chamber lOLs can help surgeons choose an appropriate IOL for each patient.</div>
</front>
</TEI>
<affiliations><list><country><li>États-Unis</li>
</country>
<region><li>Caroline du Sud</li>
</region>
</list>
<tree><country name="États-Unis"><region name="Caroline du Sud"><name sortKey="Izak, Andrea M" sort="Izak, Andrea M" uniqKey="Izak A" first="Andrea M." last="Izak">Andrea M. Izak</name>
</region>
<name sortKey="Apple, David J" sort="Apple, David J" uniqKey="Apple D" first="David J." last="Apple">David J. Apple</name>
<name sortKey="Macky, Tamer A" sort="Macky, Tamer A" uniqKey="Macky T" first="Tamer A." last="Macky">Tamer A. Macky</name>
<name sortKey="Pandey, Suresh K" sort="Pandey, Suresh K" uniqKey="Pandey S" first="Suresh K." last="Pandey">Suresh K. Pandey</name>
<name sortKey="Trivedi, Rupal H" sort="Trivedi, Rupal H" uniqKey="Trivedi R" first="Rupal H." last="Trivedi">Rupal H. Trivedi</name>
<name sortKey="Werner, Liliana" sort="Werner, Liliana" uniqKey="Werner L" first="Liliana" last="Werner">Liliana Werner</name>
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</record>

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Serveur d'exploration sur les dispositifs haptiques

Loop memory of haptic materials in posterior chamber intraocular lenses

Loop memory of haptic materials in posterior chamber intraocular lenses

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

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