Development of noninvasive tonometer using resonance phenomenon

M. Nakai, T. Nagaoka, I. Yoshizawa, A. Fujita, S. Takeda, K. Yanasima, A. Uchiyama

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A tonometer is used to measure ocular pressure either by shooting a short blast of compressed air onto the cornea or by applying pressure directly to the cornea. At present, the tonometer is the primary instrument available for measuring ocular pressure. However, measuring ocular pressure by such means can either frighten or injure the patient. We propose an improved method of measuring ocular pressure in which the tonometer is applied over the patient's closed eyelid for several seconds. The sensor part of the newly developed tonometer contains a bimorph type transducer and weighs only 28.7 (g). When the sensor is placed on the eyelid and the transducer is vibrated by altering the applied voltage, the current flowing through the transducer changes in relation to the ocular pressure. Ocular pressure can thus be determined based on the current flowing through the system. During measurement, patients are generally unaware of the vibrations of the sensor and report no pain.

Original languageEnglish
Pages (from-to)2055-2058
Number of pages4
JournalUnknown Journal
Volume26 III
Publication statusPublished - 2004

Fingerprint

Transducers
transducers
cornea
sensors
Sensors
compressed air
pain
Compressed air
blasts
vibration
Electric potential
electric potential

Keywords

  • Bimorph type transducer
  • Eyelid
  • Glaucoma
  • Noninvasive
  • Ocular pressure
  • Sensor
  • Tonometer
  • Vibration

ASJC Scopus subject areas

  • Bioengineering

Cite this

Nakai, M., Nagaoka, T., Yoshizawa, I., Fujita, A., Takeda, S., Yanasima, K., & Uchiyama, A. (2004). Development of noninvasive tonometer using resonance phenomenon. Unknown Journal, 26 III, 2055-2058.

Development of noninvasive tonometer using resonance phenomenon. / Nakai, M.; Nagaoka, T.; Yoshizawa, I.; Fujita, A.; Takeda, S.; Yanasima, K.; Uchiyama, A.

In: Unknown Journal, Vol. 26 III, 2004, p. 2055-2058.

Research output: Contribution to journalArticle

Nakai, M, Nagaoka, T, Yoshizawa, I, Fujita, A, Takeda, S, Yanasima, K & Uchiyama, A 2004, 'Development of noninvasive tonometer using resonance phenomenon', Unknown Journal, vol. 26 III, pp. 2055-2058.
Nakai M, Nagaoka T, Yoshizawa I, Fujita A, Takeda S, Yanasima K et al. Development of noninvasive tonometer using resonance phenomenon. Unknown Journal. 2004;26 III:2055-2058.
Nakai, M. ; Nagaoka, T. ; Yoshizawa, I. ; Fujita, A. ; Takeda, S. ; Yanasima, K. ; Uchiyama, A. / Development of noninvasive tonometer using resonance phenomenon. In: Unknown Journal. 2004 ; Vol. 26 III. pp. 2055-2058.
@article{c95449ce8cb14cb8bece1d56debfb14f,
title = "Development of noninvasive tonometer using resonance phenomenon",
abstract = "A tonometer is used to measure ocular pressure either by shooting a short blast of compressed air onto the cornea or by applying pressure directly to the cornea. At present, the tonometer is the primary instrument available for measuring ocular pressure. However, measuring ocular pressure by such means can either frighten or injure the patient. We propose an improved method of measuring ocular pressure in which the tonometer is applied over the patient's closed eyelid for several seconds. The sensor part of the newly developed tonometer contains a bimorph type transducer and weighs only 28.7 (g). When the sensor is placed on the eyelid and the transducer is vibrated by altering the applied voltage, the current flowing through the transducer changes in relation to the ocular pressure. Ocular pressure can thus be determined based on the current flowing through the system. During measurement, patients are generally unaware of the vibrations of the sensor and report no pain.",
keywords = "Bimorph type transducer, Eyelid, Glaucoma, Noninvasive, Ocular pressure, Sensor, Tonometer, Vibration",
author = "M. Nakai and T. Nagaoka and I. Yoshizawa and A. Fujita and S. Takeda and K. Yanasima and A. Uchiyama",
year = "2004",
language = "English",
volume = "26 III",
pages = "2055--2058",
journal = "Nuclear Physics A",
issn = "0375-9474",
publisher = "Elsevier",

}

TY - JOUR

T1 - Development of noninvasive tonometer using resonance phenomenon

AU - Nakai, M.

AU - Nagaoka, T.

AU - Yoshizawa, I.

AU - Fujita, A.

AU - Takeda, S.

AU - Yanasima, K.

AU - Uchiyama, A.

PY - 2004

Y1 - 2004

N2 - A tonometer is used to measure ocular pressure either by shooting a short blast of compressed air onto the cornea or by applying pressure directly to the cornea. At present, the tonometer is the primary instrument available for measuring ocular pressure. However, measuring ocular pressure by such means can either frighten or injure the patient. We propose an improved method of measuring ocular pressure in which the tonometer is applied over the patient's closed eyelid for several seconds. The sensor part of the newly developed tonometer contains a bimorph type transducer and weighs only 28.7 (g). When the sensor is placed on the eyelid and the transducer is vibrated by altering the applied voltage, the current flowing through the transducer changes in relation to the ocular pressure. Ocular pressure can thus be determined based on the current flowing through the system. During measurement, patients are generally unaware of the vibrations of the sensor and report no pain.

AB - A tonometer is used to measure ocular pressure either by shooting a short blast of compressed air onto the cornea or by applying pressure directly to the cornea. At present, the tonometer is the primary instrument available for measuring ocular pressure. However, measuring ocular pressure by such means can either frighten or injure the patient. We propose an improved method of measuring ocular pressure in which the tonometer is applied over the patient's closed eyelid for several seconds. The sensor part of the newly developed tonometer contains a bimorph type transducer and weighs only 28.7 (g). When the sensor is placed on the eyelid and the transducer is vibrated by altering the applied voltage, the current flowing through the transducer changes in relation to the ocular pressure. Ocular pressure can thus be determined based on the current flowing through the system. During measurement, patients are generally unaware of the vibrations of the sensor and report no pain.

KW - Bimorph type transducer

KW - Eyelid

KW - Glaucoma

KW - Noninvasive

KW - Ocular pressure

KW - Sensor

KW - Tonometer

KW - Vibration

UR - http://www.scopus.com/inward/record.url?scp=11144322891&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=11144322891&partnerID=8YFLogxK

M3 - Article

VL - 26 III

SP - 2055

EP - 2058

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

ER -