Q-switched CTE:YAG laser sclerostomies on human autopsy eyes.
Identifieur interne : 000C37 ( Ncbi/Merge ); précédent : 000C36; suivant : 000C38Q-switched CTE:YAG laser sclerostomies on human autopsy eyes.
Auteurs : O. Kermani [Allemagne] ; H. Lubatschowski ; W. Ertmer ; G K KrieglsteinSource :
- German journal of ophthalmology [ 0941-2921 ] ; 1993.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- methods : Sclerostomy.
- ultrastructure : Eye, Sclera, Trabecular Meshwork.
- Humans, Laser Therapy, Microscopy, Electron, Scanning, Ophthalmologic Surgical Procedures.
Abstract
Experimental laser sclerostomies were performed on human eye-bank eyes with a new mid-infrared solid-state laser that is characterized by adequate optic-fiber transmission and low-thermal tissue interaction. The laser presented herein works with a chromium thulium erbium-doped (CTE): YAG crystal as the active medium, emitting radiation at a wavelength of 2.69 microns. In the Q-switch mode, the pulse duration is tunable from 0.5 to 2.5 microseconds. The maximal energy is 50 mJ/pulse (1-10 Hz). Attenuation of energy transmission in quartz (0.3 ppm) optic fibers is < 8 dB/m (diameter, 200 microns). Absorption depths of 2.69 microns radiation in water is 12.5 microns. In vitro procedures performed were ab-interno and ab-externo full-thickness sclerostomies. Histological and micro-morphological examination was performed by light microscopy and scanning electron microscopy. Collateral tissue damage in processed sclerostomies did not exceed 50(+/- 10) microns at typical fluences (10 J/cm2). In contact guidance, 10-15 laser pulses were required in the full-thickness ab-externo procedure, whereas up to 50 pulses were required in the ab-interno procedure. The number of laser pulses applied corresponded to the length of the filtration canals created. The canal was significantly longer (2.5 +/- 1 mm) in the ab-interno approach than in the ab-externo approach (1 +/- 0.2 mm). The intraocular ostium of the filtration canal in the ab-externo procedure showed enhanced signs of mechanical deterioration. It is concluded that both the wavelength (2.69 microns) and the pulse duration (0.5-2.5 microseconds) of the CTE: YAG laser are appropriate for laser sclerostomy.(ABSTRACT TRUNCATED AT 250 WORDS)
PubMed: 8485435
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Ertmer</name></author><author><name sortKey="Krieglstein, G K" sort="Krieglstein, G K" uniqKey="Krieglstein G" first="G K" last="Krieglstein">G K Krieglstein</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="1993">1993</date><idno type="RBID">pubmed:8485435</idno><idno type="pmid">8485435</idno><idno type="wicri:Area/PubMed/Corpus">000787</idno><idno type="wicri:explorRef" wicri:stream="PubMed" wicri:step="Corpus" wicri:corpus="PubMed">000787</idno><idno type="wicri:Area/PubMed/Curation">000787</idno><idno type="wicri:explorRef" wicri:stream="PubMed" wicri:step="Curation">000787</idno><idno type="wicri:Area/PubMed/Checkpoint">000787</idno><idno type="wicri:explorRef" wicri:stream="Checkpoint" wicri:step="PubMed">000787</idno><idno type="wicri:Area/Ncbi/Merge">000C37</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Q-switched CTE:YAG laser sclerostomies on human autopsy eyes.</title><author><name sortKey="Kermani, O" sort="Kermani, O" uniqKey="Kermani O" first="O" last="Kermani">O. Kermani</name><affiliation wicri:level="1"><nlm:affiliation>University Eye Hospital of Cologne, Germany.</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>University Eye Hospital of Cologne</wicri:regionArea></affiliation></author><author><name sortKey="Lubatschowski, H" sort="Lubatschowski, H" uniqKey="Lubatschowski H" first="H" last="Lubatschowski">H. Lubatschowski</name></author><author><name sortKey="Ertmer, W" sort="Ertmer, W" uniqKey="Ertmer W" first="W" last="Ertmer">W. Ertmer</name></author><author><name sortKey="Krieglstein, G K" sort="Krieglstein, G K" uniqKey="Krieglstein G" first="G K" last="Krieglstein">G K Krieglstein</name></author></analytic><series><title level="j">German journal of ophthalmology</title><idno type="ISSN">0941-2921</idno><imprint><date when="1993" type="published">1993</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Eye (ultrastructure)</term><term>Humans</term><term>Laser Therapy</term><term>Microscopy, Electron, Scanning</term><term>Ophthalmologic Surgical Procedures</term><term>Sclera (ultrastructure)</term><term>Sclerostomy (methods)</term><term>Trabecular Meshwork (ultrastructure)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Humains</term><term>Microscopie électronique à balayage</term><term>Oeil (ultrastructure)</term><term>Procédures de chirurgie ophtalmologique</term><term>Réseau trabéculaire de la sclère (ultrastructure)</term><term>Sclère (ultrastructure)</term><term>Sclérostomie ()</term><term>Thérapie laser</term></keywords><keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Sclerostomy</term></keywords><keywords scheme="MESH" qualifier="ultrastructure" xml:lang="en"><term>Eye</term><term>Sclera</term><term>Trabecular Meshwork</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Humans</term><term>Laser Therapy</term><term>Microscopy, Electron, Scanning</term><term>Ophthalmologic Surgical Procedures</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Humains</term><term>Microscopie électronique à balayage</term><term>Oeil</term><term>Procédures de chirurgie ophtalmologique</term><term>Réseau trabéculaire de la sclère</term><term>Sclère</term><term>Sclérostomie</term><term>Thérapie laser</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Experimental laser sclerostomies were performed on human eye-bank eyes with a new mid-infrared solid-state laser that is characterized by adequate optic-fiber transmission and low-thermal tissue interaction. The laser presented herein works with a chromium thulium erbium-doped (CTE): YAG crystal as the active medium, emitting radiation at a wavelength of 2.69 microns. In the Q-switch mode, the pulse duration is tunable from 0.5 to 2.5 microseconds. The maximal energy is 50 mJ/pulse (1-10 Hz). Attenuation of energy transmission in quartz (0.3 ppm) optic fibers is < 8 dB/m (diameter, 200 microns). Absorption depths of 2.69 microns radiation in water is 12.5 microns. In vitro procedures performed were ab-interno and ab-externo full-thickness sclerostomies. Histological and micro-morphological examination was performed by light microscopy and scanning electron microscopy. Collateral tissue damage in processed sclerostomies did not exceed 50(+/- 10) microns at typical fluences (10 J/cm2). In contact guidance, 10-15 laser pulses were required in the full-thickness ab-externo procedure, whereas up to 50 pulses were required in the ab-interno procedure. The number of laser pulses applied corresponded to the length of the filtration canals created. The canal was significantly longer (2.5 +/- 1 mm) in the ab-interno approach than in the ab-externo approach (1 +/- 0.2 mm). The intraocular ostium of the filtration canal in the ab-externo procedure showed enhanced signs of mechanical deterioration. It is concluded that both the wavelength (2.69 microns) and the pulse duration (0.5-2.5 microseconds) of the CTE: YAG laser are appropriate for laser sclerostomy.(ABSTRACT TRUNCATED AT 250 WORDS)</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="MEDLINE"><PMID Version="1">8485435</PMID><DateCreated><Year>1993</Year><Month>06</Month><Day>08</Day></DateCreated><DateCompleted><Year>1993</Year><Month>06</Month><Day>08</Day></DateCompleted><DateRevised><Year>2007</Year><Month>11</Month><Day>15</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0941-2921</ISSN><JournalIssue CitedMedium="Print"><Volume>2</Volume><Issue>2</Issue><PubDate><Year>1993</Year><Month>Apr</Month></PubDate></JournalIssue><Title>German journal of ophthalmology</Title><ISOAbbreviation>Ger J Ophthalmol</ISOAbbreviation></Journal><ArticleTitle>Q-switched CTE:YAG laser sclerostomies on human autopsy eyes.</ArticleTitle><Pagination><MedlinePgn>100-6</MedlinePgn></Pagination><Abstract><AbstractText>Experimental laser sclerostomies were performed on human eye-bank eyes with a new mid-infrared solid-state laser that is characterized by adequate optic-fiber transmission and low-thermal tissue interaction. The laser presented herein works with a chromium thulium erbium-doped (CTE): YAG crystal as the active medium, emitting radiation at a wavelength of 2.69 microns. In the Q-switch mode, the pulse duration is tunable from 0.5 to 2.5 microseconds. The maximal energy is 50 mJ/pulse (1-10 Hz). Attenuation of energy transmission in quartz (0.3 ppm) optic fibers is < 8 dB/m (diameter, 200 microns). Absorption depths of 2.69 microns radiation in water is 12.5 microns. In vitro procedures performed were ab-interno and ab-externo full-thickness sclerostomies. Histological and micro-morphological examination was performed by light microscopy and scanning electron microscopy. Collateral tissue damage in processed sclerostomies did not exceed 50(+/- 10) microns at typical fluences (10 J/cm2). In contact guidance, 10-15 laser pulses were required in the full-thickness ab-externo procedure, whereas up to 50 pulses were required in the ab-interno procedure. The number of laser pulses applied corresponded to the length of the filtration canals created. The canal was significantly longer (2.5 +/- 1 mm) in the ab-interno approach than in the ab-externo approach (1 +/- 0.2 mm). The intraocular ostium of the filtration canal in the ab-externo procedure showed enhanced signs of mechanical deterioration. It is concluded that both the wavelength (2.69 microns) and the pulse duration (0.5-2.5 microseconds) of the CTE: YAG laser are appropriate for laser sclerostomy.(ABSTRACT TRUNCATED AT 250 WORDS)</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Kermani</LastName><ForeName>O</ForeName><Initials>O</Initials><AffiliationInfo><Affiliation>University Eye Hospital of Cologne, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Lubatschowski</LastName><ForeName>H</ForeName><Initials>H</Initials></Author><Author ValidYN="Y"><LastName>Ertmer</LastName><ForeName>W</ForeName><Initials>W</Initials></Author><Author ValidYN="Y"><LastName>Krieglstein</LastName><ForeName>G K</ForeName><Initials>GK</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D003160">Comparative Study</PublicationType><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>GERMANY</Country><MedlineTA>Ger J Ophthalmol</MedlineTA><NlmUniqueID>9206441</NlmUniqueID><ISSNLinking>0941-2921</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName MajorTopicYN="N" UI="D005123">Eye</DescriptorName><QualifierName MajorTopicYN="N" UI="Q000648">ultrastructure</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D006801">Humans</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y" UI="D053685">Laser Therapy</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D008855">Microscopy, Electron, Scanning</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y" UI="D013508">Ophthalmologic Surgical Procedures</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D012590">Sclera</DescriptorName><QualifierName MajorTopicYN="N" UI="Q000648">ultrastructure</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D012599">Sclerostomy</DescriptorName><QualifierName MajorTopicYN="Y" UI="Q000379">methods</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D014129">Trabecular Meshwork</DescriptorName><QualifierName MajorTopicYN="N" UI="Q000648">ultrastructure</QualifierName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>1993</Year><Month>4</Month><Day>1</Day></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>1993</Year><Month>4</Month><Day>1</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>1993</Year><Month>4</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">8485435</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Allemagne</li></country></list><tree><noCountry><name sortKey="Ertmer, W" sort="Ertmer, W" uniqKey="Ertmer W" first="W" last="Ertmer">W. Ertmer</name><name sortKey="Krieglstein, G K" sort="Krieglstein, G K" uniqKey="Krieglstein G" first="G K" last="Krieglstein">G K Krieglstein</name><name sortKey="Lubatschowski, H" sort="Lubatschowski, H" uniqKey="Lubatschowski H" first="H" last="Lubatschowski">H. Lubatschowski</name></noCountry><country name="Allemagne"><noRegion><name sortKey="Kermani, O" sort="Kermani, O" uniqKey="Kermani O" first="O" last="Kermani">O. Kermani</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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