EP 1109485 A1 20010627 - NON-CONTACT TONOMETER HAVING NON-LINEAR PRESSURE INCREASE
Title (en)
NON-CONTACT TONOMETER HAVING NON-LINEAR PRESSURE INCREASE
Title (de)
BERÜHRUNGSLOSES TONOMETER MIT NICHTLINEARER DRUCKZUNAHME
Title (fr)
TONOMETRE SANS CONTACT A AUGMENTATION DE PRESSION NON LINEAIRE
Publication
Application
Priority
- US 9914734 W 19990629
- US 11469898 A 19980713
Abstract (en)
[origin: WO0002481A1] A non-contact tonometer (10) having a fluid pulse generating system (12) for causing corneal applanation is improved by changing the pressure versus time characteristics of the fluid pulse from a linearly increasing relationship of the prior art to a non-linearly increasing relationship which reduces the impulse energy delivered to the eye during testing for purposes of patient comfort. In a preferred embodiment, an automatically driven piston (16) for producing an air pulse is provided with a linearly increasing current source (30) for driving the piston mechanism, whereby the pressure of the air pulse increases as a squared function of time to reduce impulse energy delivered to the eye.
IPC 1-7
IPC 8 full level
A61B 3/16 (2006.01)
CPC (source: EP)
A61B 3/165 (2013.01)
Citation (search report)
See references of WO 0002481A1
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 0002481 A1 20000120; CA 2335084 A1 20000120; EP 1109485 A1 20010627; JP 2002520078 A 20020709
DOCDB simple family (application)
US 9914734 W 19990629; CA 2335084 A 19990629; EP 99930818 A 19990629; JP 2000558749 A 19990629