<http://webisa.webdatacommons.org/prov/337318981> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/402440802> . <http://webisa.webdatacommons.org/prov/317829096> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/402440802> . <http://webisa.webdatacommons.org/402440802> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/402440802> <http://www.w3.org/ns/prov#wasQuotedFrom> <google.es> . <http://webisa.webdatacommons.org/402440802> <http://www.w3.org/ns/prov#value> "Once the protective corneal applanator device 102 is in place, the surgeon or other physician releases the plunger 306 of the vacuum syringe 302 to produce a pressure differential that provides partial suction to hold the protective corneal applanator device 102 onto the patient's cornea 204." .