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WO2008006903A1 - Dispositif et procédé de détermination d'une pression interne sans contact - Google Patents

Dispositif et procédé de détermination d'une pression interne sans contact Download PDF

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Publication number
WO2008006903A1
WO2008006903A1 PCT/EP2007/057253 EP2007057253W WO2008006903A1 WO 2008006903 A1 WO2008006903 A1 WO 2008006903A1 EP 2007057253 W EP2007057253 W EP 2007057253W WO 2008006903 A1 WO2008006903 A1 WO 2008006903A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
controller
internal pressure
eye
vibration
Prior art date
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.)
Ceased
Application number
PCT/EP2007/057253
Other languages
German (de)
English (en)
Inventor
Michael Sorg
Axel Freiherr Von Freyberg
Gert Goch
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.)
Universitaet Bremen
Original Assignee
Universitaet Bremen
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.)
Filing date
Publication date
Application filed by Universitaet Bremen filed Critical Universitaet Bremen
Publication of WO2008006903A1 publication Critical patent/WO2008006903A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention relates to a device for non-contact determination of the deformability of a deformable body, in particular the internal pressure of an eye, with a sound conductor having an open first end and a remote from this second end, and with a transducer facing the first end is arranged at the second end.
  • the invention relates to a method for the contactless determination of the internal pressure of a deformable body, in particular the internal pressure of an eye, in which with a sound transducer by means of a sound conductor, the body can be acted upon by a pressure wave.
  • non-contact tonometer which applanate the cornea instead of a stamp, for example, with an air pulse.
  • non-contact tonometers sometimes provide unreliable results even with low corneal irregularities. They are therefore mainly used for screening because they are only suitable for accurate and reliable measurements.
  • a large force on the eye for applanation is required. Likewise, the risk of spreading infection by sprayed tear fluid can not be ruled out.
  • the corneal rigidity is not sufficiently considered.
  • the form the cornea is influenced only by the intraocular pressure and has no inherent rigidity. Even compensations in today's recognized measuring methods do not provide sufficient accuracy.
  • the consideration of the influence of the cornea is becoming increasingly important, because more and more people can be removed within the scope of a refractive surgery parts of the cornea.
  • the problem underlying the invention is to provide an apparatus and a method for contactless determination of the internal pressure of a deformable body, with which can be determined reliably and with high accuracy of intraocular pressure, with damage to the cornea, as well as a spread of Infectious diseases are avoided by the measurement as possible and the device and the method of a patient is not perceived as unpleasant as possible.
  • a sensor for detecting the vibration of the body is provided in a device of the type mentioned.
  • the problem is solved in that in a method of the type mentioned by means of a sensor, the vibration of the body is detected to determine the internal pressure.
  • the eye With the invention of the body to be measured, for example, the eye, arranged at the first end of the sound conductor and acted upon by means of the transducer with a pressure wave.
  • a pressure wave This can be, for example, a rectangular pulse, a sine wave or another suitable sound signal.
  • the senor is a microphone.
  • the vibration behavior of the body can be easily detected.
  • the transducer is used as a sensor. In this case, for example, a so-called microphone speaker can be used.
  • the structure is particularly simple.
  • the sensor is a linear pressure sensor. With this, the temporal pressure behavior in the sound conductor can be easily recorded.
  • the sensor is an optical sensor. Also by means of such an optical sensor, the vibration behavior of the eyeball can be reliably detected. By using a combination of several of the aforementioned sensors, the accuracy can be improved.
  • the sound conductor is a tube whose first end is formed for airtight placement on the tissue surrounding an eye.
  • a tube is used reliably to conduct the sound or a pressure wave in general, with incorrect operations are recognized by leaks simple and significant in the measurement result. In this way, a misuse can be largely avoided.
  • a development of the invention is characterized by a control for driving the sound transducer and for evaluating the Sensor signal.
  • the internal pressure of the body can be determined automatically.
  • the controller may have a list of measurement results, each associated with an internal pressure.
  • the controller is configured to determine the acoustic impedance of the body. This acoustic impedance provides a good relationship to the internal pressure of the body. But it is also possible that the controller is designed to determine the amplitude and / or the phase. This makes the detection of the vibration of the body particularly easy.
  • the controller may also be designed to determine the damping of the body. The damping of the body is also a characteristic measure of intraocular pressure.
  • Another embodiment is characterized in that the control is designed to determine the vibration response and / or the impulse response.
  • This vibration response and / or impulse response of the body provides characteristic information about the internal pressure.
  • means for detecting the voltage profile and / or the current profile can also be arranged on the sound transducer and / or on the sensor. This voltage curve or this current profile can be detected and evaluated particularly easily electronically.
  • Another embodiment of the invention is characterized by a laser for optically determining the vibration of the body.
  • the white area of the eyeball can be illuminated and this area can be detected by means of an optical sensor.
  • the oscillation of the eyeball can also be detected reliably and with little error.
  • Another embodiment of the invention is characterized by an additional microphone.
  • an additional microphone On the one hand, incorrect operation can be reliably detected by means of such an additional microphone.
  • This additional microphone allows This additional microphone to include higher frequencies of the vibration of the body in the evaluation.
  • a development of the invention is characterized by a Peil bride.
  • a direction finding aid which can be for example an optical display or a cross, it is possible to achieve an optimal positioning of the eyeball in the measuring system for the measurement.
  • the aiming aid can be fluorescent or excitable.
  • a display can be used inside the device as a sighting aid. In an attempt to read the display and recognize the detected values, the patient then automatically positions his eye.
  • a development of the method according to the invention is characterized in that by means of a controller, the amplitude and / or the phase of the vibrations is detected. These values allow an accurate and reliable determination of the internal pressure of the body.
  • the control By means of the control, however, the oscillation response and / or the impulse response of the body can also be evaluated.
  • the processing of the acquired data becomes particularly simple when induced voltages detected by the controller are evaluated by the sensor.
  • the induced voltages can be converted into pressure values. In this case, in each case associated pressure values can be associated, in particular by means of lists of individual induced voltages. It is also possible that the control determines the damping by the body.
  • a large damping is assigned to a low internal pressure and a low damping to a high internal pressure.
  • the determination of the internal pressure is preferably carried out by means of a model-based evaluation.
  • the eye is regarded as a sound or pressure transducer, which is coupled via an air column with another sound or pressure transducer.
  • Fig. 1 is a schematic representation of a tonometer with the
  • FIG. 2 is a schematic circuit diagram of the tonometer of FIG. 1;
  • FIG. 2 is a schematic circuit diagram of the tonometer of FIG. 1;
  • Fig. 3 is a schematic representation of a rectangular pulse, a
  • Fig. 4 is a schematic circuit arrangement of another
  • Fig. 5 is a schematic representation of a tonometer with optical vibration detection.
  • Fig. 1 shows a schematic representation of a tonometer 10 with the features of the invention.
  • the tonometer 10 is used to measure the intraocular pressure of an eye 11.
  • the tonometer 10 has a sound conductor 12, which is formed in the embodiment shown as a tube 12 with a closed wall. An open end of the tube 12 is airtight pressed against the surrounding the eye 11 tissue.
  • a sound transducer 13 At the end facing away from the eye 11 of the tube 12, a sound transducer 13, namely a speaker 13 is arranged.
  • the loudspeaker 13 is connected to a controller 14, by means of which the loudspeaker 13 can be activated to generate a sound wave.
  • the controller 14 is used at the same time to read the signal detected by the speaker 13.
  • Fig. 2 shows schematically the switching arrangement of the tonometer 10 of Fig. 1.
  • the speaker 13 is electrically energized by means of a voltage source 15.
  • the voltage source 15 is either part of the controller 14 or controlled by this.
  • a voltage measuring device 16 the voltage profile is measured at the coil of the speaker 13.
  • a measuring resistor 17 is also arranged.
  • Another voltage device 18 measures the voltage drop across the measuring resistor 17. From this voltage drop, the current profile can be determined via the voice coil of the speaker 13.
  • Fig. 3 shows in Figure a a sound pulse generated by the loudspeaker 13.
  • the sound pulse is in the embodiment shown as Rectangular pulse formed.
  • Figure b shows the measured waveform of an eye with low internal pressure. As can be seen from the figure, a low internal pressure leads to overshoot with high amplitude but also great damping.
  • the internal pressure of the eye can thus be determined precisely and reliably.
  • Fig. 4 shows a further embodiment of a circuit arrangement of a tonometer in a schematic representation.
  • a sound transducer 19 is connected to a power source 20 similar to the power source 15.
  • the microphone transducer 19 is connected to a resistor 22, the voltage drop across the resistor 22 being measured by means of a voltage measuring device 23. In this way, the current profile of the microphone coil 21 can be determined from the voltage drop across the measuring resistor 22.
  • Fig. 5 shows a schematic representation of a tonometer 24 as a further embodiment with the features of the invention.
  • the tonometer 24 has a similar structure to the tonometer 10. The same elements bear the same reference numbers.
  • the tonometer 24 has a sound conductor 25, which is similar to the sound conductor 12 is formed as a tube 25 with a closed wall.
  • the tonometer 24 has a laser 26 and an optical sensor 27. By means of the laser 26, a white area of the eye 24 is irradiated. The oscillation of the eye 11 after excitation by a sound pulse of The speaker 13 is then detected by means of the optical sensor 27 and evaluated by the controller 14.
  • the intraocular pressure is determined on the basis of a model-based evaluation.
  • the eye is regarded as a sound or pressure transducer, which is coupled via an air column with another sound or pressure transducer.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

L'invention concerne un dispositif de détermination, sans contact, de la pression interne d'un corps déformable (11), en particulier de la pression interne d'un oeil (11), dispositif comprenant un conducteur acoustique (12) présentant une première extrémité ouverte, et une seconde extrémité opposée à la première, et un transducteur à ultrasons (13) qui est disposé à la seconde extrémité, orientée vers la première extrémité. En vue de déterminer la pression interne de l'oeil (11) avec une précision élevée et de façon que l'oeil (11) ne soit soumis qu'à une faible charge, l'invention est caractérisée en ce qu'on utilise un capteur destiné à détecter les vibrations de l'oeil (11). De plus, ce dispositif permet d'empêcher efficacement toute extension d'infection.
PCT/EP2007/057253 2006-07-14 2007-07-13 Dispositif et procédé de détermination d'une pression interne sans contact Ceased WO2008006903A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006033035.8A DE102006033035B4 (de) 2006-07-14 2006-07-14 Vorrichtung und Verfahren zur berührungslosen Innendruckbestimmung
DE102006033035.8 2006-07-14

Publications (1)

Publication Number Publication Date
WO2008006903A1 true WO2008006903A1 (fr) 2008-01-17

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Application Number Title Priority Date Filing Date
PCT/EP2007/057253 Ceased WO2008006903A1 (fr) 2006-07-14 2007-07-13 Dispositif et procédé de détermination d'une pression interne sans contact

Country Status (2)

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DE (1) DE102006033035B4 (fr)
WO (1) WO2008006903A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010284223A (ja) * 2009-06-09 2010-12-24 Nidek Co Ltd 非接触式超音波測定装置
CN114727757A (zh) * 2019-11-29 2022-07-08 伊卡尔芬兰有限公司 用于测量眼部的至少一个参数的系统和方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5478230B2 (ja) * 2009-03-31 2014-04-23 株式会社ニデック 非接触式超音波眼圧計

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690158A (en) * 1970-05-06 1972-09-12 Bernard Lichtenstein Means and method for detection of glaucoma
US4930507A (en) * 1988-09-23 1990-06-05 Welch Allyn, Inc. Double chamber acoustical tonometer
US5251627A (en) * 1991-06-27 1993-10-12 Morris Donald E Non-invasive measurement of eyeball pressure using vibration
DE10039896A1 (de) 2000-08-16 2002-03-07 Inst Technik Der Informationsv Tonometer zur berührungslosen Messung des Augeninnendrucks
GB2377763A (en) * 2001-06-21 2003-01-22 Pbx Ltd Acoustic intraocular pressure sensor
WO2003082087A1 (fr) * 2002-03-28 2003-10-09 Eric Technologies Corp. Tonometre sans contact
EP1374759A1 (fr) * 2001-03-30 2004-01-02 Waseda University Procede et dispositif de mesure de la tension intraoculaire
US20040193033A1 (en) * 2002-10-04 2004-09-30 Badehi Avner Pierre Noninvasive methods and apparatuses for measuring the intraocular pressure of a mammal eye

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4583801B2 (ja) * 2004-04-23 2010-11-17 学校法人早稲田大学 圧力測定方法および圧力測定装置ならびに眼圧計

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690158A (en) * 1970-05-06 1972-09-12 Bernard Lichtenstein Means and method for detection of glaucoma
US4930507A (en) * 1988-09-23 1990-06-05 Welch Allyn, Inc. Double chamber acoustical tonometer
US5251627A (en) * 1991-06-27 1993-10-12 Morris Donald E Non-invasive measurement of eyeball pressure using vibration
DE10039896A1 (de) 2000-08-16 2002-03-07 Inst Technik Der Informationsv Tonometer zur berührungslosen Messung des Augeninnendrucks
EP1374759A1 (fr) * 2001-03-30 2004-01-02 Waseda University Procede et dispositif de mesure de la tension intraoculaire
GB2377763A (en) * 2001-06-21 2003-01-22 Pbx Ltd Acoustic intraocular pressure sensor
WO2003082087A1 (fr) * 2002-03-28 2003-10-09 Eric Technologies Corp. Tonometre sans contact
US20040193033A1 (en) * 2002-10-04 2004-09-30 Badehi Avner Pierre Noninvasive methods and apparatuses for measuring the intraocular pressure of a mammal eye

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010284223A (ja) * 2009-06-09 2010-12-24 Nidek Co Ltd 非接触式超音波測定装置
CN114727757A (zh) * 2019-11-29 2022-07-08 伊卡尔芬兰有限公司 用于测量眼部的至少一个参数的系统和方法

Also Published As

Publication number Publication date
DE102006033035A1 (de) 2008-01-17
DE102006033035B4 (de) 2015-06-03

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