JPH11225974A - Tonometer and calibration unit used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a calibration function of a tonometer. SOLUTION: A calibration unit consisting of a cylindrical member 12 on which a reflection member 14 is attached through a plate spring 13 is inserted until it comes into contact with a front face of a measuring part and is fixed by a screw 15. When an air stream is blown from a nozzle, the reflection member 14 is pressed, the plate spring 13 is deformed from its original position to change its angle, and the reflection member 14 moves to a tip side of the cylindrical member 12. When a face of the reflection member 14 becomes vertical in the direction of air stream, a cornea deformation detection signal of a tonometer becomes the maximum, a pressure of air stream at this time is measured by a pressure sensor and is converted into an eye pressure value, and it is judged that the tonometer is normal if this value is the same as a numerical value N of the calibration unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intraocular pressure measuring device used in an ophthalmic hospital and the like, and a calibration unit used in the device.

[0002]

2. Description of the Related Art Conventionally, a tonometer for measuring an intraocular pressure by blowing an airflow onto a cornea and detecting the amount of the deformation photoelectrically,
For example, this device is disclosed in U.S. Pat. No. 4220038, and this apparatus performs calibration of a measurement system by attaching a rubber model eye to a face support. There is also known a tonometer provided with a separate means for checking a pressurizing system that generates an airflow.

[0003]

However, in the above-mentioned conventional example, the method of calibrating using a model eye requires an alignment means, has a complicated structure, and is applied to an apparatus without a face support or a hand-held type. There is a problem that can not be. Further, in a device having a function of checking the pressurizing system, since the corneal deformation detecting system cannot be checked, calibration based on the corneal deformation amount to be measured is impossible.

An object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide an intraocular pressure measurement apparatus which can easily calibrate a measurement system with a simple structure and measure an accurate intraocular pressure value.

It is another object of the present invention to provide a calibration unit capable of performing calibration including a corneal deformation detection system in a tonometer.

[0006]

According to the present invention, there is provided an intraocular pressure measuring apparatus for measuring an intraocular pressure by blowing an air flow to deform a cornea and photoelectrically detecting an amount of the deformation. The pressure gauge is characterized in that it has a calibration unit including a reflecting member held by a spring member and changing the inclination by the air flow, and a mounting member that can be mounted on a blowing portion of the air flow.

Further, the calibration unit according to the present invention is provided with a spring member for calibrating a tonometer for measuring an intraocular pressure by blowing a stream of air to deform the cornea and photoelectrically detecting the amount of the deformation to measure the intraocular pressure. A reflecting member that changes the inclination by airflow,
And a mounting member that can be mounted on the airflow blowing section.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 shows a side view of the tonometer,
A slide table 2 whose position can be adjusted is placed on the top, and a face receiver 3 is fixed to the subject side. A measurement unit 5 having a built-in measurement optical system and a CRT display unit 4 is mounted on the slide table 2, and an operation rod 6 is provided on the examiner side.

FIG. 2 is an enlarged cross-sectional view of the tip of the measuring section 5. A cylindrical member 8 is mounted on the front surface 7 of the measuring section 5, and a nozzle 9 is disposed at substantially the center of the cylindrical member 8. The front end surface of the member 8 is a window member 10 that transmits light. In the vicinity of the cylindrical member 8 on the front surface 7 of the measuring unit, a projection 11 for positioning is provided.

FIG. 3 is a perspective view of the calibration unit, and FIG. 4 is a side view thereof. The calibration unit comprises a cylindrical member 12 which can be attached to the cylindrical member 8, and the cylindrical member 12 has a leaf spring made of stainless steel or the like. 13 is joined to one end of the leaf spring 1.
A reflecting member 14 made of glass or the like having a mirror reflectance close to that of the cornea is attached to the other end of 3.
The leaf spring 13 is arranged such that the reflecting member 14 is located at the center of the opening of the cylindrical member 12 and, when the axis of the cylindrical member 12 is also horizontal, the cylindrical member 12 is inclined several degrees inward from the tip 12a. 12 is fixed to the upper part.

A rear end portion 12b of the cylindrical member 12 serves as a mounting portion for the tonometer.
5 is attached, and a notch 16 for positioning is provided at the rear end portion 12 b of the cylindrical member 12 in accordance with the projection 11.

At the time of calibration, the other end 12b of the cylindrical member 12 is inserted into the cylindrical member 8 of the measuring section 5 until it comes into contact with the front surface 7 of the measuring section 5. In this case, the notch 1 of the cylindrical member 12
Since the rotation angle of the calibration unit becomes constant by inserting 6 into alignment with the protrusion 11 on the front surface 7 of the measuring unit, the calibration unit is fixed with the screw 15.

As a result, the positional relationship between the reflecting member 14 and the nozzle 9 is determined to be three-dimensionally constant. In this state, when an air current is blown from the inside through the nozzle 9 to the reflecting member 14, the leaf spring 13 returns to the original state. The reflecting member 14 is deformed from the position and the angle is changed, and the reflecting member 14 moves toward the distal end portion 12a of the cylindrical member 12. Then, the reflecting member 14 becomes further perpendicular to the airflow and then tilts outward.

The position when the surface of the reflecting member 14 is perpendicular to the airflow direction corresponds to the position of the cornea at the time of measurement of the human eye. At this time, the corneal deformation detection signal of the tonometer becomes maximum, and at this time, The airflow pressure is measured by a built-in pressure sensor, converted into an intraocular pressure value, and displayed on the CRT display unit 4. If this value is the same as the numerical value N displayed on the calibration unit, the tonometer can be determined to be normal. The value N of the calibration unit can be prepared in various sizes depending on the strength and inclination of the leaf spring 13.

FIG. 5 is a side view of a spring member of a calibration unit according to another embodiment which is used by being attached to the cylindrical member 14, and FIG. 6 is a partial side view as viewed from the opposite side. Can be varied. The bar 20 is configured to be rotatable on a bearing with respect to a rotation shaft 20 a perpendicular to the paper surface, and a reflection member 21 is attached to a tip of the bar 20. One end of a winding spring 22 is fixed to the rotating shaft 20a, and the other end of the winding spring 22 is attached to a pointing member 23 rotatable about the rotating shaft 20a.
On the surface of the display panel 3, a display panel 24 having a numerical scale serving as a calibration value on the circumference is provided.

The bar 20 is pressed against a stop member 25 by a winding spring 22. By rotating the indicating member 23 as shown by an arrow, the winding spring 22 is wound or released to change the rotation torque of the bar 20. Then, the calibration value is changed. Also in this calibration unit, the bearing of the rotating shaft 20a, the display panel 24, and the stopper member 25 are fixed to the cylindrical member 12 similar to FIGS.

At the time of calibration, the user rotates the indicating member 23 to adjust the mark M on the display panel 24 to an appropriate numerical scale. For example, when the measurement value is displayed at 15 when the measurement is performed by the calibration unit in accordance with the numerical value 15, the tonometer can be determined to be normal. If the mark M is set to an arbitrary numerical scale and calibrated, the tonometer can be calibrated over a wide range.

In the above description, the attachment unit of the calibration unit to the tonometer is of a cap type, but may be of a power plug type. In this case, a receiving insertion hole is provided on the tonometer side. In this case, the reflection members 14 and 21 may have a fixed positional relationship with respect to the nozzle 9.

[0019]

As described above, the intraocular pressure measuring apparatus according to the present invention comprises a calibration unit comprising a reflecting member held by a spring member and changing the inclination by an air flow, and a mounting member attachable to a blowing portion of the air flow. With this, the calibration of the detection system can be performed easily, so that there is no need to mount an alignment means, and the configuration can be simplified.

Further, the calibration unit according to the present invention includes a reflecting member which is held by a spring member and changes its inclination by an air current, and an attachment member which can be attached to a blowing part of the air current, thereby facilitating the calibration of the detection system. This can be effectively applied to a hand-held device without a face rest, a device for self-alignment, and the like.

[Brief description of the drawings]

FIG. 1 is a side view of a tonometer.

FIG. 2 is an enlarged cross-sectional view of a tip of a measurement unit.

FIG. 3 is a perspective view of a calibration unit of the embodiment.

FIG. 4 is a side view.

FIG. 5 is a side view of a spring member according to another embodiment.

FIG. 6 is a front view of the display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 4 CRT display part 5 Measurement part 9 Nozzle 12 Cylindrical member 13 Leaf spring 14, 21 Reflection member 20 Bar 22 Winding spring 23 Pointing member 24 Display panel

Claims (3)

[Claims] 1. A tonometer for measuring an intraocular pressure by blowing an air flow to deform a cornea and photoelectrically detecting an amount of the deformation,
An intraocular pressure measurement apparatus, comprising: a calibration unit including a reflection member held by a spring member and changing a tilt by the airflow, and a mounting member that can be mounted on a blowing part of the airflow. A reflecting member which is held by a spring member and changes the inclination by said air flow, in order to calibrate a tonometer which blows an air flow to deform the cornea and photoelectrically detects an amount of the deformation to measure an intraocular pressure. And a mounting member that can be mounted to the airflow blowing section. 3. The calibration unit according to claim 2, wherein the spring member is a leaf spring.