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WO2006047801A1 - Dispositif servant a determiner la tension intraoculaire - Google Patents

Dispositif servant a determiner la tension intraoculaire Download PDF

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Publication number
WO2006047801A1
WO2006047801A1 PCT/AT2005/000434 AT2005000434W WO2006047801A1 WO 2006047801 A1 WO2006047801 A1 WO 2006047801A1 AT 2005000434 W AT2005000434 W AT 2005000434W WO 2006047801 A1 WO2006047801 A1 WO 2006047801A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring
data
force
sensor
pressure
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/AT2005/000434
Other languages
German (de)
English (en)
Inventor
Albert Daxer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2006047801A1 publication Critical patent/WO2006047801A1/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

Definitions

  • the invention relates to a device for determining the intraocular pressure with an attachable to the eye support surface for pressurizing the cornea of the eye, with a measuring device, the at least one sensor for measuring force or pressure data on the support surface and at least one device for measuring at Having the support surface adjacent Horn ⁇ skin thickness, and with a data-connected to the measuring device arithmetic unit for determining the intraocular pressure in dependence of Da ⁇ th the measuring device.
  • the sensors for measuring force or pressure data are always in a frictional connection with the velvet bearing surface, wherein the support surface is partially or completely in contact with the cornea of the eye.
  • the contact surface between the cornea and support surface must be known.
  • the contact surface must be brought into a predefined size, wo ⁇ call for various devices such adjustment mechanisms or complex optical devices their own.
  • a appointmentssvor ⁇ gang has been found to be particularly time-consuming, and is therefore not only uncomfortable for a patient but also costly, since for such activities qualified and thus relatively expensive operating personnel is needed.
  • the invention has therefore set itself the task, starting from the above-described prior art to provide a device with which Ein ⁇ times and fast way the intraocular pressure can be measured.
  • the device should be cost-effective and particularly safe against application errors.
  • the invention solves this problem by the fact that the sensor for measuring force or pressure data with a portion of the support surface non-positively and / or that the measuring device is connected to the arithmetic unit for data transmission of additional surface-related data.
  • the invention makes use of the notorious application of the device in order to determine the inner pressure of the eye and it does not have to be as in the prior art Technique neces sary, a certain contact surface between eye and bearing surface ein ⁇ be made. It has been surprisingly found that during ei ⁇ ner measurement of the dependent of a part of the support surface force or pressure data on the size of a known by the construction Kunststoffflä ⁇ surface can be deduced.
  • the support part frictionally connected to the sensor is not yet completely within the contact surface. If the force or pressure data subsequently no longer change significantly, a transition point for a defined contact surface can be recognized, since in this case the contact surface includes that bearing part which is frictionally connected to the sensor. It can thus be concluded according to the invention exclusively via measurement of force or pressure data on a known contact surface, which then also allows Be ⁇ mood of the intraocular pressure.
  • the invention is characterized by its simplicity and reliability. The same can also be ensured if the measuring device is connected to the computing unit for data transmission of additional surface-related data.
  • surface-related data relating to the contact surface can be assigned to the measured force or pressure data, which also makes it possible to determine the intraocular pressure without having to set up a specific contact surface for this purpose. It can thus be achieved in both cases or in their combination, a device with which the intraocular pressure can be measured in a simple and fast way, and since no setting up of the device is necessary, this Vorrich ⁇ device against application errors is particularly safe , In addition, no means for setting up the contact surface need to be provided, which makes the device inexpensive and thus accessible to a wide range of applications.
  • the device for measuring the corneal thickness applied to the support surface acts essentially over a central part of the support surface, high measurement accuracy can be ensured by measuring in the plane region of the cornea since measurement inaccuracies result from warping of the cornea, in particular in the edge region the contact surface, can be excluded. With this particularly accurate thickness measurement, the intraocular pressure can then be determined exactly as a result.
  • the measuring device for measuring the force or pressure data as well as area-related data is assigned a location-resolving sensor which at least partially forms the bearing surface.
  • a location-resolving sensor which at least partially forms the bearing surface.
  • measured force or pressure data can be assigned a Kon ⁇ contact surface between the cornea and support surface, which in turn, without having to set a specific contact surface, the intraocular pressure can be deduced.
  • the area-related data is limited to that part of the support surface which adjoins the part of the support surface for measuring the corneal thickness.
  • area-related data are determined only after the important for the thickness measurement part of the support surface, so that it can be ruled out that in the thickness measurement possible Verwöl ⁇ exercises or curvatures of the cornea in the edge region of the contact surface be ⁇ be considered.
  • the intraocular pressure can only be determined if the contact surface is larger than the important for the thickness measurement part of the Support surface is, so that the arithmetic unit always Exact measurement data available avail ⁇ .
  • the force sensor is non-positively connected to a substantially central part of the support surface.
  • the arithmetic unit has a memory for recording sampled force or pressure data, the arithmetic unit determining the internal pressure of the eye as a function of a data value determined from the stored force data, it is possible to compensate for measuring tolerances. In addition, it can be used to improve the ease of use, since the measurement data recorded in the case of improper handling can be filtered or discarded, and the intraocular pressure nevertheless remains determinable.
  • a measuring head establishes the force connection between a part of the support surface and the sensor for measuring force or pressure data, the measuring head being at least partially connected to a supply part of the ultrasonic head having a liquid, then a particularly effective coupling of the sensor can be achieved Ultrasonic head are made possible to the measuring head.
  • the buoyancy of the floating body can be used to compensate for the dead weight of the measuring head, which improves the measuring accuracy.
  • the subject invention is beispiels ⁇ shown. Show it 1 shows a cross-sectionally illustrated first embodiment with a punch having a force or pressure sensor, wherein the punch pressurizes the cornea of an eye,
  • FIG. 2 is a cross-sectional view of a second embodiment with a spatially resolving pressure sensor
  • FIG. 5 is a bottom view of Fig. 3 and Fig. 4,
  • FIG. 6 shows a cross-section illustrated fifth embodiment with a sensor for force or pressure measurement over the entire support surface
  • FIG. 7 shows a sixth exemplary embodiment, shown in cross-section, with a supply part having a liquid for an ultrasonic head
  • Fig. 8 is a cross-sectionally illustrated seventh embodiment with a float
  • Fig. 9 is a schematic representation of the electronic processing of measurement data for determining the intraocular pressure.
  • a device with a punch 1 which forms a support surface 2 for applying pressure to the cornea 3 of an eye 4.
  • the support surface 2 is divided into two, namely in a support part 6 frictionally connected to a sensor 5 and another support part 7 coaxially surrounding this support part 6.
  • the sensor 5 belongs to a measuring device, the force absorbed by the sensor 5 or print data of a data-connected computing unit.
  • the arithmetic unit has been omitted for reasons of clarity. Simple construction conditions result from the fact that the support part 6, which is frictionally connected to the sensor 5, is formed by a device for measuring corneal thickness, designed as an ultrasonic measuring head 8.
  • the Ul Traschall measuring head 8 on a flow part and an ultrasonic head with a Ul ⁇ traschallempf briefly and transmitter which has not been shown in detail for clarity reasons.
  • the intraocular pressure can be determined without, as necessary in the prior art, a specific contact surface 9 between support surface 2 and cornea 3 must be set.
  • the deformed or applanated cornea 3 steadily increases, as long as the deformed cornea 1 is smaller than the part 6 of the support surface 2, which part 6 is frictionally connected to the sensor 5 Measured values ensures. If the applanated cornea or the contact surface 9 exceeds this support part 6, then a change in the valency of the measured data can be detected.
  • a turning point for a defined applanation of the cornea 3 or defined contact surface 9 can be detected.
  • the intraocular pressure results from the data measured on the sensor 5 and the contact surface 9, which is the same as the part 6 of the support surface 2, which is non-positively connected to the sensor 5.
  • an increasing load on the cornea 2 of the eye 4 is initially unknown in any increase in valence of the measurement data of the sensor 5, but that this situation changes measurably at a contact surface 9 equal to the support surface 2.
  • a time range with measured force or pressure data is formed, or certain force or pressure data are established, which can be used to determine the intraocular pressure using the surface of the part 6 of the support surface 2.
  • the intraocular pressure can be determined in a simple manner from the force or pressure data of the sensor 5, taking account of the part 6 of the support surface 2, with a correction on the basis of the corneal thickness measured by the ultrasound measuring head 8 allowing a particularly accurate determination of the internal pressure of the eye is.
  • the arithmetic unit (17) is assigned a memory for recording the sampled force or pressure data, wherein the arithmetic unit (17) determines a data value from these stored force or pressure data, eg via the Determination of an average value from the force or pressure data, from which the eye nendruck can be determined more precisely, which can be better taken from Fig. 9.
  • the second embodiment according to FIG. 2 has, instead of a centrally arranged sensor 5, a spatially resolving sensor 10 which at least partially forms the support surface 2.
  • the spatial resolution can be less than 0.5 mm, so that a sensor 5 for force or pressure measurement is distributed at least every 0.5 mm over the area of extent of the spatially resolving sensor 10.
  • the ultrasonic measuring head 8 for measuring the callous thickness applied to the support surface is arranged centrally in the die 1 and is coaxially enclosed by the spatially resolving sensor 8, but it is conceivable that the device for measuring the corneal thickness applied to the contact surface passes through the spatially resolving sensor 10 receives measurement data.
  • the ultrasonic measuring head 8 therefore contributes in these embodiments to the deformation of the cornea 3.
  • an optical sensor 11 is assigned to the device for measuring area-related data.
  • the device for measuring the thickness of the cornea 3 - designed as an ultrasonic measuring head 8 - is again arranged centrally in the die 1 and is coaxially enclosed by the optical sensor 11, the optical sensor 11 partially forming the contact surface 2.
  • the current applanation or contact area 9 of the cornea 3 can be determined via image recognition.
  • the visibility of the edge of the contact surface 9 can be improved by known contrast methods, such as by Lichtpolarisations-, reflection, illumination, refraction, fluorescence or dyeing.
  • the surface measurement is carried out when the contact surface exceeds the support part 6, via wel ⁇ Chen pad part 6 of the ultrasonic measuring head 8 acts on the cornea 3.
  • the non-positive bond between the support part 6 and the sensor 5 is detected by the ultrasonic measuring head 8. provides.
  • the force or pressure data of the sensor 5 and the data on the corneal thickness of the ultrasonic measuring head 8 a particularly accurate and rapid determination of the internal pressure of the eye can be achieved.
  • an application-friendly device can thus be created because, without paying attention to the contact surfaces 8, the intraocular pressure can be determined.
  • the fourth embodiment differs from the above-mentioned in that the optical sensor 11 is arranged on the stamping surface 2 penetratelie ⁇ ing stamp page, for which purpose the stamp 1 lichtssens ⁇ sig is formed. Also in this case, the contact surface can be determined in a simple manner.
  • the force or pressure data of the sensor 5 are measured over the entire contact surface 2.
  • the sensors 5 are seen vor ⁇ between the punch 1 and the holder 13.
  • the punch 1 has an ultrasonic measuring head in the form of a lead-in part 12, via which the ultrasonic head
  • the ultrasound probe 13 acts on the cornea 3.
  • optical sensors 11 for measuring the contact surface 9. It is thus always possible to determine the inner pressure of the eye to the measured force or pressure data of the sensors 5 on the basis of surface-related data from the optical sensors 11, without a specific contact surface 9 having to be set.
  • the intraocular pressure is likewise corrected with the measurement data for the corneal thickness of the ultrasound head 13, as is known in the other embodiments.
  • the measuring head 14 is partially connected to a liquid 15 having Vorlauf ⁇ part 12 of the ultrasonic head 13.
  • the liquid 15 of the flow part 12 can be limited for example by a flexible film in the edge region, which film with the ultrasonic head 13 and the measuring head 14th connected to the creation of a tight degree.
  • a power connection is made via the measuring head 14, which also partially forms the support surface 2.
  • the force or pressure measurement of the sensors 5 again takes place via a part 6 of the support surface 2, wherein the contact surface 9 can be determined in the same way both via additional surface-related data or, as mentioned in the exemplary embodiment 1.
  • the ultrasonic head 13 for measuring the thickness of the cornea 3 acts in this case on the liquid 15 and the measuring head 14 on the adjacent eye. 4
  • the weight of the measuring head 14, which partially forms the bearing surface 2 can be reduced by assigning at least one floating body 16 to the part of the measuring head 14 projecting into the liquid 15.
  • the weight of the measuring head 14 can be decoupled from the measuring method, which also creates a position-independent force or pressure measurement.
  • the floating body 16 instead of the floating body 16 to use a spring device to achieve the same effect, which has not been shown in detail. What is needed is a sealing between the measuring head 14 and the adjacent end faces of the two support parts 6 and 7 of the punch 1.
  • a computing unit 17 ent which with a sensor 5 for the measurement of force or pressure data as well as with a device, in particular an ultrasonic measuring head 8, for measuring the at the Support surface 2 adjacent corneal thickness is data-connected. Depending on the received measurement data, the Augeninnen ⁇ pressure is then determined.
  • the measurement data of the sensor 5 for measuring force or pressure data can also be stored in a memory 18.
  • surface-related data can be transmitted to the arithmetic unit 17 via the sensor 5, which is designed as a spatially resolving pressure sensor 10, or these data are made available via optical sensors 11.

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  • 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)
  • Ultra Sonic Daignosis Equipment (AREA)

Abstract

L'invention concerne un dispositif servant à déterminer la tension intraoculaire, lequel dispositif présente une surface d'appui (2), destinée à être placée sur l'oeil (4) et prévue pour appliquer une pression sur la cornée (3) de l'oeil (4), un dispositif de mesure, comportant au moins un capteur (5) destiné à mesurer des données de force ou de pression sur la surface d'appui (2) et au moins un dispositif destiné à mesurer l'épaisseur de la cornée adjacente à la surface d'appui (2), ainsi qu'une unité de calcul (17) en liaison de données avec l'unité de mesure, laquelle unité de calcul est prévue pour déterminer la tension intraoculaire en fonction des données du dispositif de mesure. L'objectif de cette invention est de créer des conditions de mesure avantageuses. A cet effet, le capteur (5) destiné à mesurer des données de force ou de pression est relié à une partie (6) de la surface d'appui (2) par liaison de force et/ou le dispositif de mesure est relié à l'unité de calcul pour la transmission de données supplémentaires relatives à la surface.
PCT/AT2005/000434 2004-11-04 2005-11-04 Dispositif servant a determiner la tension intraoculaire Ceased WO2006047801A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AT18372004 2004-11-04
ATA1837/2004 2004-11-04
ATA143/2005 2005-01-31
AT1432005 2005-01-31

Publications (1)

Publication Number Publication Date
WO2006047801A1 true WO2006047801A1 (fr) 2006-05-11

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PCT/AT2005/000434 Ceased WO2006047801A1 (fr) 2004-11-04 2005-11-04 Dispositif servant a determiner la tension intraoculaire

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011015178B3 (de) * 2011-03-21 2012-05-03 Epsa Gmbh Vorrichtung und Verfahren zur automatisierten Bestimmung des Intraokulardruckes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355884A (en) * 1992-10-30 1994-10-18 Bennett Emeric S Applanation tonometer for measuring intraocular pressure
US6113542A (en) * 1998-12-15 2000-09-05 Hyman; George F. Diagnostic apparatus and method to provide effective intraocular pressure based on measured thickness of the cornea
US20010051770A1 (en) * 1997-12-22 2001-12-13 Falck Francis Y. Replaceable prism for applanation tonometer
US20020193675A1 (en) * 2001-06-13 2002-12-19 Sis Ag Surgical Instrument Systems Devices and methods for determining the inner pressure of an eye
US20040044278A1 (en) * 2002-09-03 2004-03-04 O'donnell Francis E. Apparatus and method for more accurate intraocular pressure determination
WO2004089198A2 (fr) * 2003-04-11 2004-10-21 Portable Ophthalmic Devices, Inc. Pachymetre

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355884A (en) * 1992-10-30 1994-10-18 Bennett Emeric S Applanation tonometer for measuring intraocular pressure
US20010051770A1 (en) * 1997-12-22 2001-12-13 Falck Francis Y. Replaceable prism for applanation tonometer
US6113542A (en) * 1998-12-15 2000-09-05 Hyman; George F. Diagnostic apparatus and method to provide effective intraocular pressure based on measured thickness of the cornea
US20020193675A1 (en) * 2001-06-13 2002-12-19 Sis Ag Surgical Instrument Systems Devices and methods for determining the inner pressure of an eye
US20040044278A1 (en) * 2002-09-03 2004-03-04 O'donnell Francis E. Apparatus and method for more accurate intraocular pressure determination
WO2004089198A2 (fr) * 2003-04-11 2004-10-21 Portable Ophthalmic Devices, Inc. Pachymetre

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011015178B3 (de) * 2011-03-21 2012-05-03 Epsa Gmbh Vorrichtung und Verfahren zur automatisierten Bestimmung des Intraokulardruckes
DE102011015178B8 (de) * 2011-03-21 2012-07-05 Epsa Gmbh Vorrichtung und Verfahren zur automatisierten Bestimmung des Intraokulardruckes

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