CN103565407A - Jet-type intraocular pressure detection device - Google Patents

Abstract

An air-jet intraocular pressure detecting device having an optical detecting device and an air blowing device, wherein the optical detecting device includes: an image light path, which is provided with a hole lens and a photosensitive element, wherein the hole lens is provided with an opening, and the photosensitive element obtains an eyeball image through the opening so as to align the eyeball position of a tested person; a detection optical path, which is provided with a detection element projecting a detection signal towards the opening and obtains a reflection signal through the opening to convert an intraocular pressure value; a spectroscope located on the image light path and the detecting light path to make the light sensing and detecting elements form a first and a second path with different axial directions. The blowing device is connected with the optical detection device and provides air to be blown out from an air blowing path formed by the opening of the hole mirror. According to the invention, the second path of the detection light path and the blowing path of the blowing device are designed to be coaxial paths, so that the error influence caused by part tolerance is effectively reduced.

Description

Jet-type intraocular pressure detection device

technical field

The invention relates to a detection device for blowing air at a constant pressure on the eyes of a subject, in particular to an intraocular pressure detection device which sets the detection optical path and the blowing path to the same direction.

Background technique

There are many tools for checking intraocular pressure, the common ones are applanation tonometer, eye pressure pen and barometric tonometer. The so-called applanation tonometer is the most reliable method for measuring intraocular pressure. Anesthetics must be applied to the cornea before the test, and then the tonometer should touch the cornea to measure the intraocular pressure.

The so-called eye pressure pen is similar to the design of the applanation tonometer, and it also needs to be touched. The main reason is that it is easy to carry and can be used for quick screening, but the failure rate and error rate are relatively high.

The so-called barometric tonometer is to instantly inject a certain pressure of gas onto the cornea to flatten the cornea, and to convert the intraocular pressure value by using electronic detection of the reflected wave response change. Its main advantage is that it does not need to touch the patient's cornea, but When the intraocular pressure is as high as 30 to 40 mm Hg, there will be errors, so it is mainly used for screening.

Please refer to Fig. 1, the traditional barometric tonometer is provided with a slit plate 11 in front of the eyeball 10, and a first lens 12 and a second lens 13 are arranged in sequence behind the slit plate 11, and the second lens 13 directly behind a photosensitive element 14 to form an image optical path 15, wherein an air blowing device (not shown) is installed between the first lens 12 and the nozzle 11, and the air passes through the gap of the nozzle 11 to form an air blowing path 16 directly blows and shoots the eyeball 10.

The detection optical path 17 of the traditional barometric tonometer is projected to the eyeball 10 with an infrared light source 18 (Infrared light source) in a different direction from the blowing device, and is received by a light source receiving device 19 (Photoelectric cell) from the eyeball 10. The reflected signal is converted to the intraocular pressure value.

However, due to the fact that the detection optical path and the blowing path of the traditional air pressure tonometer are set on different paths, tolerances on parts and errors in assembly will easily cause differences in judgment results. Therefore, in order to enable the barometric tonometer to calculate the intraocular pressure more accurately, it is necessary to improve and innovate the detection light path and image light path of the traditional barometric tonometer.

Contents of the invention

The main purpose of the present invention is to provide an air-jet intraocular pressure detection device. The detection optical path and the air blowing device are designed to be on a coaxial path, which can effectively reduce the influence of errors caused by component tolerances.

Another object of the present invention is to use OCT technology to cooperate with the measurement of the position and time required for corneal applanation, so as to reduce the time required for detection to a limited extent.

To achieve the above object, the air-jet intraocular pressure detection device of the present invention is mainly composed of an optical detection device and an air blowing device, wherein the above-mentioned optical detection device includes: an image optical path, an aperture mirror and a photosensitive element, The hole mirror has an opening, and the photosensitive element obtains the eyeball image of the subject through the hole mirror opening to align the eyeball position of the subject; a detection optical path has a detection element for detecting intraocular pressure, and the detection element faces the hole The mirror opening projects the detection signal, and obtains the reflected signal of the subject's eyeball through the hole mirror opening to convert the current intraocular pressure value; and a beam splitter, located on the image optical path and the detection optical path, makes the photosensitive element and The detection elements of the detection optical path respectively form a first path and a second path with different axial directions.

The air blowing device is assembled with the optical detection device, and supplies air to the optical detection device, and an air blowing path is formed by the opening of the aperture mirror to blow out. Wherein, the air blowing path of the air blowing device and the second path of the detection optical path are located on a coaxial path, while the air blowing path of the air blowing device and the first path of the image optical path are located on a non-axial path.

In the present invention, at least one relay lens is further added inside the image optical path and the detection optical path. In a feasible embodiment, a first relay lens is provided between the above-mentioned aperture mirror and the beam splitter, and a first relay lens is provided between the above-mentioned beam splitter and the photosensitive element. Two relay lenses, and a third relay lens is arranged between the beam splitter and the detection element. Furthermore, the air blowing device is assembled between the aperture mirror and the first relay lens.

In a preferred embodiment, the above-mentioned detection element is set as an optical coherence scanning imaging (OCT, Optical Coherence Tomography) device or a photosensitive coupling device (CCD, ChargeCoupled Device); and the above-mentioned photosensitive element is set as a complementary metal Oxide semiconductor image sensor (CMOS image sensor).

The invention has the advantage that the detection optical path and the air blowing device are designed on the coaxial path, which effectively reduces the error influence caused by the tolerance of parts. At the same time, use OCT technology with CMOS or CCD to measure the position and time required for corneal applanation, and limit the time required for detection.

Description of drawings

Figure 1 is a schematic diagram of the imaging path of a traditional intraocular pressure detection device; and

Fig. 2 is a schematic diagram of the imaging path of the injector-type intraocular pressure detection device of the present invention.

Description of main component symbols:

10---eyeball

11---nozzle

12---First lens

13---Second lens

14---photosensitive element

15---Image light path

16---Blowing path

17---Detection optical path

18---infrared light source

19---Light source receiving device

20---Optical detection device

21---Image light path

210---hole mirror

211---opening

212---photosensitive element

213---First path

214---The first relay lens

215---Second relay lens

22---Detection light path

220---detection element

221---Second path

222---The third relay lens

23---beam splitter

30---Blowing device

31---Blowing path

Detailed ways

In order to further have a clearer and more detailed understanding and understanding of the structure, use and features of the present invention, preferred embodiments are given, and the details are as follows in conjunction with the drawings:

Please refer to FIG. 2 , the air jet intraocular pressure detection device of the present invention is mainly composed of a detection optical detection device 20 for measuring the pressure of the eyeball 10 and an air blowing device 30 for blowing air to the eyeball 10 .

In a preferred embodiment, the optical detection device 20 mainly includes: an image optical path 21, a detection optical path 22, and a beam splitter 23, wherein the image optical path 21 is provided with a hole with an opening 211 at one end adjacent to the eyeball 10 The mirror 210 is provided with a photosensitive element 212 at the other end. The photosensitive element 212 obtains the image of the eyeball 10 of the subject through the opening 211 of the aperture mirror 210 to align the position of the eyeball 10 of the subject.

In addition, the detection optical path 22 has a detection element 220 for detecting intraocular pressure. The detection element 220 projects a detection signal toward the opening 211 of the aperture 210, and obtains the reflected signal of the eyeball 10 of the subject through the aperture 211 of the aperture 210, so as to Calculate the current intraocular pressure value.

Furthermore, the beam splitter 23 is located on the image optical path 21 and the detection optical path 22, so that the photosensitive element 212 of the image optical path 21 and the detection element 220 of the detection optical path 22 respectively form a first path 213 and a second path 221 with different axial directions. .

The air blowing device 30 is assembled with the optical detection device 20 , and supplies air to the optical detection device 20 , and blows air out through an air blowing path 31 formed by the opening 211 of the aperture mirror 210 .

The feature of the present invention is that the air blowing path 31 of the air blowing device 30 and the second path 221 of the detection optical path 22 are located on the coaxial path, while the air blowing path 31 of the air blowing device 30 and the first path 213 of the image optical path 21 are located at different positions. on the coaxial path. In this way, the air blowing path 31 and the detection optical path 22 can be located on the same axial path, effectively reducing the influence of errors caused by component tolerances.

As shown in Figure 2, in a preferred embodiment, a relay lens is further added inside the above-mentioned image optical path 21 and detection optical path 22, and a first relay lens 214 is provided between the above-mentioned aperture mirror 210 and the beam splitter 23, A second relay lens 215 is disposed between the beam splitter 23 and the photosensitive element 212 , and a third relay lens 222 is disposed between the beam splitter 23 and the detection element 22 . In the feasible embodiment of the drawing, the air blowing device 30 is assembled between the aperture mirror 210 and the first relay lens 214 .

However, this is only for the convenience of illustration, and is not intended to limit the type and quantity of mirrors in the image optical path 21 and the detection optical path 22, that is, the above-mentioned image optical path 21 and detection optical path 22 can be added with other functions according to other functional requirements in the design. Different types and quantities of mirrors.

In a preferred embodiment, the detection element 220 is configured as an Optical Coherence Tomography (OCT, Optical Coherence Tomography) device or a Charge Coupled Device (CCD, Charge Coupled Device). The photosensitive element 212 is configured as a complementary metal oxide semiconductor image sensor (CMOS image sensor).

In the present invention, the position of the eyeball 10 is measured by the photosensitive element 212 of the above-mentioned image optical path 21, and the error correction is performed after the position is confirmed, so that the detection element 220 located on the coaxial line of the air jet path 31 can minimize the error of the components, and finally The detection element 220 directly calculates the response variation to convert the current intraocular pressure value of the eyeball 10 .

To sum up, the present invention designs the detection optical path and the air blowing device on a coaxial path, which effectively reduces the influence of errors caused by component tolerances. It takes time to limit the time required for detection.

The above-mentioned embodiments are only used to illustrate the present invention for convenience and do not limit it. Without departing from the spirit of the present invention, various simple deformations and modifications made by those of ordinary skill in the art according to the patent scope of the present invention and the description of the invention should still be implemented. Included in the scope of the following patent applications.

Claims (7)

1. A jet type intraocular pressure detection device, comprising: An optical detection device, comprising: An image light path is provided with an aperture mirror and a photosensitive element, the aperture mirror has an opening, and the above photosensitive element obtains the eyeball image of the subject through the opening of the aperture mirror, so as to align the eyeball position of the subject; A detection optical path has a detection element for detecting intraocular pressure, the detection element projects a detection signal towards the opening of the aperture, and obtains the reflected signal of the subject's eyeball through the aperture of the aperture to convert the current value of intraocular pressure; and A beam splitter, located on the image optical path and detection optical path, so that the photosensitive element of the image optical path and the detection element of the detection optical path respectively form a first path and a second path with different axial directions; and An air blowing device, which is assembled with the above-mentioned optical detection device, and provides air to the above-mentioned optical detection device, and a blowing path is formed by the opening of the above-mentioned hole mirror to blow out; Wherein, the above-mentioned air blowing path and the second path are located on a coaxial path, and the above-mentioned air blowing path and the first path are located on a non-coaxial path. 2 . The jet-type intraocular pressure detection device according to claim 1 , wherein at least one relay lens is further added inside the image optical path and the detection optical path. 3 . 3. The jet-type intraocular pressure detection device according to claim 2, wherein a first relay lens is provided between the aperture mirror and the beam splitter, and a second relay lens is provided between the beam splitter and the photosensitive element, A third relay lens is arranged between the beam splitter and the detection element. 4. The air jet intraocular pressure detection device according to claim 3, wherein the air blowing device is disposed between the aperture mirror and the first relay lens. 5. The jet-type intraocular pressure detection device according to claim 1, wherein the detection element is an optical coherent scanning imaging device. 6. The jet-type intraocular pressure detection device according to claim 1, wherein the detection element is an optical coupling element. 7. The jet-type intraocular pressure detection device as claimed in claim 1, wherein the photosensitive element is a complementary metal oxide semiconductor image sensor.

Images