GB1306695A – Tonometers
– Google Patents
GB1306695A – Tonometers
– Google Patents
Tonometers
Info
Publication number
GB1306695A
GB1306695A
GB2596570A
GB2596570A
GB1306695A
GB 1306695 A
GB1306695 A
GB 1306695A
GB 2596570 A
GB2596570 A
GB 2596570A
GB 2596570 A
GB2596570 A
GB 2596570A
GB 1306695 A
GB1306695 A
GB 1306695A
Authority
GB
United Kingdom
Prior art keywords
voltage
ramp
circuit
peak
signal
Prior art date
1969-05-28
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2596570A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American Optical Corp
Original Assignee
American Optical Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1969-05-28
Filing date
1970-05-28
Publication date
1973-02-14
1970-05-28
Application filed by American Optical Corp
filed
Critical
American Optical Corp
1973-02-14
Publication of GB1306695A
publication
Critical
patent/GB1306695A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
A—HUMAN NECESSITIES
A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
A61B5/00—Measuring for diagnostic purposes; Identification of persons
A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
A61B5/316—Modalities, i.e. specific diagnostic methods
A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
A61B5/346—Analysis of electrocardiograms
A61B5/349—Detecting specific parameters of the electrocardiograph cycle
A61B5/352—Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
A—HUMAN NECESSITIES
A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients’ perceptions or reactions
A61B3/16—Objective types, i.e. instruments for examining the eyes independent of the patients’ perceptions or reactions for measuring intraocular pressure, e.g. tonometers
A61B3/165—Non-contacting tonometers
Abstract
1306695 Tonometers AMERICAN OPTICAL CORP 28 May 1970 [28 May 1969] 25865/70 Heading A5K [Also in Division H3] A device for controlling the operation of an air puff tonometer, comprises means 50 for sensing cardiac pulse signals, a ramp voltage waveform generator 52, responsive to the ouput of sensor 50 and generating successive ramp waveforms the generation of each of which is initiated by detection of a cardiac pulse signal and terminated by the detection of the following cardiac signal, means- 54 for deriving a voltage equal to the peak ramp waveform voltage, means 48 for deriving a voltage which is a selectable percentage of said peak voltage, and means 58 for comparing said selected voltage with the instantaneous ramp waveform voltage and, when the selected voltage and ramp voltage are equal, for supplying a signal to means 60 for actuating the firing of an air puff at a point in each cardiac cycle corresponding to the percentage of said peak voltage selected. A signal from a plethysmograph, or an EKG signal, is ‘amplified and shaped by circuit 50 to produce short output pulses, the periodicity of which is that of the heart beat, which initiate discharge of a 0.5 mfd capacitor in the ramp generator 52 to terminate a ramp waveform. The output of generator 52 is passed to a peak reader 54, which derives a voltage equal to the peak value of the ramp voltage waveform, and to the coincidence detector 58. The output of peak reader 54 passes to a circuit 56, which derives a pulse rate reading which is displayed on a meter, and to a potential divider in circuit 48. An adjustable tap in circuit 48 applies a selected percentage of the peak ramp voltage to circuit 58, which, when coincidence is detected, fires a thyristor in circuit 60 controlling a solenoid, which, providing a tonometer trigger switch has previously been operated, then allows a fluid pulse to be fired at the eye for determination of the intraocular pressure. Adjustment of the tap in circuit 48 alters the time between the commencement of a cardiac cycle and the instant of intraocular pressure measurement in that cycle.
GB2596570A
1969-05-28
1970-05-28
Tonometers
Expired
GB1306695A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US82850669A
1969-05-28
1969-05-28
Publications (1)
Publication Number
Publication Date
GB1306695A
true
GB1306695A
(en)
1973-02-14
Family
ID=25252007
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB2596570A
Expired
GB1306695A
(en)
1969-05-28
1970-05-28
Tonometers
Country Status (6)
Country
Link
US
(1)
US3572100A
(en)
JP
(1)
JPS4917476B1
(en)
CH
(1)
CH518088A
(en)
DE
(1)
DE2024155C2
(en)
FR
(1)
FR2043737A1
(en)
GB
(1)
GB1306695A
(en)
Families Citing this family (15)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS5834129B2
(en)
*
1975-10-29
1983-07-25
ミノルタ株式会社
Guntei Miyakuhakei
HU172843B
(en)
*
1975-11-17
1978-12-28
Medicor Muevek
Device for ophthalmic particularly glaucoma screening test
JPS5288442A
(en)
*
1976-01-20
1977-07-23
Kinji Hiraide
Electric toothbrush
JPS5479864U
(en)
*
1977-11-14
1979-06-06
US4386611A
(en)
*
1980-06-02
1983-06-07
Warner Lambert Technologies, Inc.
Tonometer with improved fluid discharged tube
DE3332724A1
(en)
*
1983-09-10
1985-03-28
Jost Dr.med. 6200 Wiesbaden Elborg
Device for measuring the intraocular pressure
JPH0642871B2
(en)
*
1986-11-27
1994-06-08
株式会社トプコン
Tonometer
US5092334A
(en)
*
1987-06-30
1992-03-03
Tokyo Kogaku Kikai Kabushiki Kaisha
Noncontact type tonometer
US5183044A
(en)
*
1987-06-30
1993-02-02
Kabushiki Kaisha Topcon
Noncontact type tonometer
JP2642397B2
(en)
*
1988-04-21
1997-08-20
株式会社トプコン
Non-contact tonometer
US5810005A
(en)
*
1993-08-04
1998-09-22
Dublin, Jr.; Wilbur L.
Apparatus and method for monitoring intraocular and blood pressure by non-contact contour measurement
US7101335B2
(en)
*
2001-02-01
2006-09-05
Nidek Co., Ltd.
Non-contact type tonometer
US7473231B2
(en)
*
2002-06-25
2009-01-06
Francis Y. Falck
Method and apparatus for examining an eye
US6817981B2
(en)
2002-07-01
2004-11-16
Reichert, Inc.
Method for eliminating error in tonometric measurements
DE102006037767A1
(en)
*
2006-08-11
2008-02-14
Volker Dockhorn
Parameter measuring process for human eye involves presetting waiting value for period duration of second parameter and dividing it into time intervals
Family Cites Families (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE1078735B
(en)
*
1958-11-11
1960-03-31
Fritz Schwarzer G M B H
Electric tonometer for ophthalmological purposes
US3585849A
(en)
*
1968-10-09
1971-06-22
American Optical Corp
Method and apparatus for measuring intraocular pressure
1969
1969-05-28
US
US828506A
patent/US3572100A/en
not_active
Expired – Lifetime
1970
1970-05-16
DE
DE2024155A
patent/DE2024155C2/en
not_active
Expired
1970-05-22
CH
CH762170A
patent/CH518088A/en
not_active
IP Right Cessation
1970-05-27
JP
JP45044955A
patent/JPS4917476B1/ja
active
Pending
1970-05-28
GB
GB2596570A
patent/GB1306695A/en
not_active
Expired
1970-05-28
FR
FR7019461A
patent/FR2043737A1/fr
not_active
Withdrawn
Also Published As
Publication number
Publication date
DE2024155A1
(en)
1970-12-03
FR2043737A1
(en)
1971-02-19
CH518088A
(en)
1972-01-31
US3572100A
(en)
1971-03-23
JPS4917476B1
(en)
1974-05-01
DE2024155C2
(en)
1984-05-30
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Legal Events
Date
Code
Title
Description
1973-06-27
PS
Patent sealed [section 19, patents act 1949]
1982-10-20
732
Registration of transactions, instruments or events in the register (sect. 32/1977)
1988-02-24
732
Registration of transactions, instruments or events in the register (sect. 32/1977)
1990-06-27
PE20
Patent expired after termination of 20 years
