Development of an Accurate Double-Diaphragm Sapphire Cryogenic Capacitive Pressure Transducer

1998 ◽  
pp. 789-794 ◽  
Author(s):  
F. Pavese ◽  
D. N. Astrov ◽  
P. P. M. Steur ◽  
D. Ferri ◽  
D. Giraudi
Keyword(s):  
Pressure Transducer

scholarly journals Goldmann Tonometry and Corneal Biomechanics

2021 ◽  
Vol 11 (9) ◽  
pp. 4025
Author(s):  
Dario Messenio ◽  
Marco Ferroni ◽  
Federica Boschetti
Keyword(s):  
Mechanical Properties ◽  
Anterior Chamber ◽  
Pressure Transducer ◽  
Pearson Correlation ◽  
Corneal Thickness ◽  
Applanation Tonometry ◽  
In Vitro Tests ◽  
Goldmann Tonometry ◽  
The Difference

Glaucoma is the second cause of irreversible blindness in the world. Intraocular pressure (IOP) is a recognized major risk factor for the development and progression of glaucomatous damage. Goldmann applanation tonometry (GAT) is internationally accepted as the gold standard for the measurement of IOP. The purpose of this study was to search for correlations between Goldmann tonometry and corneal mechanical properties and thickness by means of in vitro tests. IOP was measured by the Goldmann applanation tonometer (GIOP), and by a pressure transducer inserted in the anterior chamber of the eye (TIOP), at increasing pressure levels by addition of saline solution in the anterior chamber of enucleated pig eyes (n = 49). Mechanical properties were also determined by inflation tests. The GAT underestimated the real measurements made by the pressure transducer, with most common differences in the range 15–28 mmHg. The difference between the two instruments, highlighted by the Bland–Altman test, was confirmed by ANOVA, normality tests, and Mann–Whitney’s tests, both on the data arranged for infusions and for the data organized by pressure ranges. Pearson correlation tests revealed a negative correlation between (TIOP-GIOP) and both corneal stiffness and corneal thickness. In conclusion, data obtained showed a discrepancy between GIOP and TIOP more evident for softer and thinner corneas, that is very important for glaucoma detection.

Passive Pressure Transducer Utilizing Acoustic Emission

1967 ◽  
Vol 38 (8) ◽  
pp. 1145-1147 ◽  
Author(s):  
H. L. Dunegan ◽  
C. A. Tatro
Keyword(s):  
Acoustic Emission ◽  
Pressure Transducer ◽  
Passive Pressure

A Disposable Blood Pressure Transducer System

1982 ◽  
Vol 7 (3) ◽  
pp. 197-200 ◽  
Author(s):  
EDWARD L. SPOTTS ◽  
THOMAS P. FRANK
Keyword(s):  
Blood Pressure ◽  
Pressure Transducer

Solid-state pressure transducer for pressuremetric titrations

1971 ◽  
Vol 43 (10) ◽  
pp. 1338-1340
Author(s):  
D. J. Curran ◽  
S. J. Swarin
Keyword(s):  
Solid State ◽  
Pressure Transducer ◽  
State Pressure
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