CN204839442U - Look net film positioning device based on eye ground imaging system - Google Patents

Abstract

The utility model relates to a retina positioning device based on a fundus imaging system, comprising a laser, a laser linkage component, a light coupling component and an optotype component. The laser is installed on the laser linkage component, and the laser linkage component includes a horizontal rotation Structure and up and down rotation structure or up and down rotation structure and left and right rotation structure are installed at a certain distance from the imaging system; the optical coupling component includes a coupler and a mechanical mounting bracket, installed on the imaging system eyepiece or the front section of the pupil, coupled The device forms a certain angle with the imaging light, and couples the positioning light and the imaging light into the human eye; the sight part includes a reflective plate with a scale and an installation structure, and is installed at a certain distance from the imaging system. . The utility model has ingenious and unique design, simple structure, can realize precise positioning of any retinal region, has the characteristics of convenient and flexible operation, high precision, and is suitable for large-scale popularization and application.

Description

A retina positioning device based on fundus imaging system

technical field

The utility model relates to the technical field of fundus imaging system, in particular to the technical field of retinal high-resolution imaging, specifically a retinal positioning device and its positioning method based on the fundus imaging system, which are used for clinical scientific research experiments and disease diagnosis in any area of the retina accurate locating.

Background technique

The retina of the human eye is a human tissue with a complex structure. It is a microstructure organization. Many diseases of the human eye itself and systemic diseases of the whole body (such as glaucoma, diabetes, high blood pressure, etc.) can be reflected on the retina of the fundus. At the same time, With the widespread occurrence of retinal diseases such as age-related macular degeneration, loss of retinal visual cells, and diabetic retinopathy, fundus imaging systems have become a hot spot in current research. Among them, the judgment of the retinal image acquisition area is a key link in the diagnosis and review of fundus diseases, which directly affects the positioning of the disease area, especially for high-resolution retinal imaging systems, the field of view is very small, about 2-3°, and any area of the retina Positioning is very important. Therefore, it is necessary to study a device that can accurately locate any area of the retina, and can quantitatively determine the position of the collected image in the retina area.

The existing retinal positioning methods are basically qualitative positioning and local specific area quantitative positioning. External fixation lights, internal fixation lights and image processing methods are used for positioning. External fixation lights generally refer to positioning at the headrest of the system Connect a bendable LED light, change the position manually, and fix the light with the other eye to achieve the effect of qualitative positioning; its disadvantage is manual operation and low positioning accuracy. Internal fixation lamp positioning generally refers to introducing an optotype into the system and changing the light source through software control to achieve positioning. The disadvantages are that the system structure is complex, the operation is not flexible enough, and the positioning is not comprehensive. In addition, there are also image processing methods for precise positioning of specific areas of the retina. This method is only applicable to large fields of view and certain special areas (optic disc, macula, blood vessels, etc.) for precise positioning.

In the Chinese utility model patent CN103971369, the method of image processing is adopted to realize the final positioning of the retinal optic disc, and the specific content can be found in the patent CN103971369. Similar patents include CN201010157031.X. There are basically few patents on the precise positioning of any area of the retina, and they have basically never been seen in China.

Therefore, there is an urgent need for a new type of retinal positioning device, which can accurately locate any area of the retina, and has the characteristics of simple structure, convenient and flexible operation, easy implementation, and high precision.

Utility model content

The purpose of this utility model is to overcome the above-mentioned shortcomings in the prior art, and provide a retinal positioning device based on the fundus imaging system. Positioning, and has the characteristics of convenient and flexible operation, high precision, etc., suitable for large-scale promotion and application.

In order to achieve the above purpose, the utility model provides a retina positioning device based on a fundus imaging system.

The technical solution adopted by the utility model is: a retinal positioning device based on the fundus imaging system, including an imaging system, the imaging system includes an eyepiece end and an objective lens end, and also includes an angle-adjustable laser, a light coupling component and a visual The target component, the light coupling component is located at the eyepiece end of the imaging system, the light coupling component forms an angle with the imaging light projected by the imaging system, the target component includes a reflector, and the target component is located at The objective end of the imaging system.

A laser linkage component is also provided, and the laser is installed on the laser linkage component.

The laser linkage components may include a horizontal rotation structure and a pitch structure, the horizontal rotation structure includes a horizontal rotation shaft, a horizontal rotation seat and a stepping motor, and the horizontal rotation shaft is connected by transmission and controls the horizontal rotation seat Rotate horizontally around the horizontal rotation axis. The pitch structure includes a pitch axis, a pitch seat and a stepping motor. The pitch shaft is connected to drive and controls the pitch seat to rotate up and down around the pitch axis. The laser installation on the pitch structure as described.

The laser linkage components may include a rolling structure, a pitching structure and a base, the rolling structure includes a rolling shaft, a rolling seat and a stepping motor, and the pitching structure includes a pitching shaft, a pitching seat and a stepping motor The motor, the laser linkage parts from top to bottom are the pitch seat, the roll seat and the base, the pitch axis is located between the pitch seat and the roll seat, and the roll axis is located between the roll seat and the base Among them, the laser is installed on the pitch structure, the rolling shaft is connected to and controls the rolling seat to rotate up and down around the rolling shaft, and the pitching shaft is connected to and controls the The pitch base rotates left and right around the pitch axis.

The rolling axis is perpendicular to the line connecting the center of the visual mark and the center of the laser linkage component.

The optical coupling component includes a coupler and a mounting frame, and the coupler is installed on the mounting frame.

The light coupling component includes a coupler and a lens barrel with a small hole, the lens barrel is installed at the light outlet of the imaging system, and the coupler is installed in the lens barrel.

The coupler is a mid-hole reflector or a beam splitter.

The angle formed between the coupler and the imaging light projected by the imaging system is 45 degrees.

The optotype component also includes a fixed bracket, and the reflector is mounted on the fixed bracket.

The reflector is perpendicular to the line connecting the center of the reflector to the center of the coupler.

It also includes a control component and a computer, one end of the control component is connected to the laser linkage component, and the other end is connected to the computer.

The beneficial effects of the utility model are: the utility model provides a retinal positioning device based on the fundus imaging system, and the retinal positioning device based on the fundus imaging system of the utility model includes a laser, a laser linkage component, a light coupling component and an optotype component The laser is installed on the laser linkage component, the laser linkage component is controlled by a stepping motor, input any retinal coordinates, calculated by software, and the two-dimensional rotation is controlled by the stepping motor, so that the laser points to the correct visual target position , the human eye looks at the laser spot on the optic mark through the coupler to achieve precise positioning of the retinal area. Ingenious and unique design, simple structure, automatic positioning, can realize precise positioning of any area of the retina, and has the characteristics of convenient and flexible operation, high precision, etc., suitable for large-scale promotion and application.

Description of drawings

Fig. 1 is a schematic structural view of a specific embodiment of the present invention.

FIG. 2 is a structural schematic diagram of one of the possible structures of the laser linkage component of the specific embodiment shown in FIG. 1 .

FIG. 3 is a schematic structural diagram of a second possible structure of the laser linkage component of the specific embodiment shown in FIG. 1 .

FIG. 4 is a schematic structural diagram of one of the structures that can be adopted by the light coupling component of the specific embodiment shown in FIG. 1 .

FIG. 5 is a schematic structural diagram of a second possible structure of the optical coupling component of the specific embodiment shown in FIG. 1 .

Fig. 6 is a schematic structural view of the visual target part of the specific embodiment shown in Fig. 1 .

FIG. 7 is a schematic diagram of the principle of the relationship between the position of the laser spot and the positioning angle of the specific embodiment shown in FIG. 1 .

FIG. 8 is a schematic diagram of the calculation principle of retinal positioning in the specific embodiment shown in FIG. 1 .

Detailed ways

In order to understand the technical content of the present utility model more clearly, the following examples are given in detail. In this case, the same components are provided with the same reference numerals.

Please refer to Fig. 1, the retina positioning device based on the fundus imaging system of the present invention includes a laser 1, a laser linkage component 2, a light coupling component 3 and an optotype component 4; the laser 1 is installed on the laser linkage component 2 , the laser linkage part 2 is installed at a certain distance from the imaging system 5; At a certain angle, the positioning optotype light 8 and the imaging light 7 are coupled together to enter the human eye 6; the optotype component 4 is installed at a certain distance from the imaging system 5 .

The laser linkage part 2 can adopt any suitable structure. In a specific embodiment of the present invention, as shown in FIG. The rotating structure 21 includes a horizontal rotating shaft 211, a horizontal rotating base 212 and a stepping motor 213. The horizontal rotating shaft 211 is connected in transmission and controls the horizontal rotating base 212 to rotate horizontally around the horizontal rotating shaft. The pitching structure 22 includes a pitch shaft 221, a pitch seat 222 and a stepping motor 213. The pitch shaft 221 is connected by transmission and controls the pitch seat 222 to rotate up and down around the pitch shaft. The laser 1 is installed on the pitch structure 22 on.

In another specific embodiment of the laser linkage component 2, as shown in FIG. , a rolling seat 232 and a stepping motor 213, the rolling shaft 231 is transmission-connected and controls the rolling seat 232 to rotate up and down around the rolling shaft, and the pitching structure 22 includes a pitching shaft 221, a pitching seat 222 and The stepper motor 213 is connected to the pitch shaft 221 in transmission and controls the pitch base 222 to rotate left and right around the pitch shaft, and the laser 1 is installed on the pitch structure 24 .

In a preferred embodiment of the laser linkage component 2 , as shown in FIGS. 1 and 3 , the roll axis 231 is perpendicular to the line connecting the center of the optotype 4 and the center of the laser linkage component 2 .

The optical coupling component 3 can adopt any suitable structure. In a specific embodiment of the present utility model, as shown in FIG. 4 , the optical coupling component 3 includes a coupler 31 and a mounting bracket 32. The coupler 31 is a mid-hole reflector or beam splitter, and the mounting bracket 32 is installed on the entire imaging system platform. In another specific embodiment, as shown in FIG. 5, the light coupling component 3 includes a coupler 31 and a lens barrel 33 with a small hole, and the coupler 31 is a mid-hole reflector or a beam splitter. , the lens barrel 33 is installed at the light outlet of the imaging system 5 .

In a preferred embodiment of the light coupling component 3 , the angle formed between the coupler 31 and the imaging light 7 is 45 degrees.

Described visual target part 4 can adopt any suitable structure, and in the specific embodiment of the present utility model, as shown in Figure 6, described visual target part comprises reflective plate 41 and fixed support 42 with scale, described The fixed bracket 42 is connected to the reflecting plate 41, and the bracket is fixed on the ground, and the scale is a radial polar coordinate scale or a Cartesian coordinate scale. In a more preferred embodiment, the reflective plate 41 can be directly pasted on the wall or ceiling.

In order to realize a certain degree or all of automation, please refer to Fig. 1, in a specific embodiment of the present invention, the described retinal positioning device based on the fundus imaging system also includes a control part 0, and one end of the control part 0 is connected to Stepper motor 213, the other end is connected to the computer, the laser linkage part 2 is controlled by the stepper motor 213, input any retinal coordinates, through the analysis of the control part 0, calculate the two-dimensional rotation angle in the laser linkage part 2, and control the two-dimensional Rotate to make the laser 1 point to the correct position of the optotype, and the human eye 6 watches the laser spot 9 on the optotype through the coupler 31 to realize precise positioning of the retinal region.

The specific positioning calculation process is as follows:

First of all, it is necessary to analyze the relationship between the position of the laser spot and the positioning angle. For the sake of simplicity, the analysis is performed from a one-dimensional schematic diagram, as shown in FIG. The line connecting the center is vertical, and when the laser spot 9 on the visual mark moves the distance H, the human eye can observe the laser spot by slightly turning the angle θ _x to realize positioning. In the figure, imaging optical path 7 and optical path 8 for positioning visual target. The positioning angle α can be obtained by calculating the moving distance H of the laser spot 9 and the distance L between the visual target reflector 41 and the pupil plane of the human eye, namely

$\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; t</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Next, the relationship between the position of the two-dimensional laser spot and the positioning angle, and the relationship between the rotation angle of the laser linkage components are analyzed. As shown in Figure 8, the reflector 41 is perpendicular to the line connecting the center of the reflector 41 and the center of the coupler 31, and the laser linkage component 2 is a horizontal rotation structure 21 and a pitch structure 22. For simplicity, establish A Cartesian coordinate system (rectangular coordinate system), with the face of the reflector 41 as the XOY plane, the direction of the line connecting the center of the coupler 31 to the center of the pupil of the human eye 6 is the positive direction of the X axis, and the center of the coupler 31 to the reflector The connection direction of the center of the plate 41 is the positive direction of the Z-axis, and the center of the coupler 31 is the origin. Let the retinal positioning angle be (θ _x , θ _y ), that is, the coordinates of the laser point of the visual mark in the XOY plane, where θ _x is the projection angle of the X-axis direction angle on the ZOX plane, and θ _y is the Y-axis direction angle on the ZOY plane The projection angle of the surface; the coordinates of the center of the laser 1 is L (x _L , y _L , z _L ), the coordinates of the center of the pupil of the human eye 6 are E (x _E , 0, 0), and the coordinates of the center of the reflector 41 are S (0, 0, z _S ), the attitude angle of the laser linkage part 2 is set to the azimuth (horizontal rotation angle) α1 and the pitch angle α2, according to the geometric relationship, the position of the laser spot 9 at the reflector 41 is:

x _S ＝(z _S +x _E )tan(θ _x )(2)

y _S ＝(z _S +x _E )tan(θ _y )(3)

Then the azimuth and elevation angles are:

$\left\{\begin{array}{c}\mathrm{<span\; class="notranslate">\; \&alpha;</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; t</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; no</span>}\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}{{\mathrm{<span\; class="notranslate">\; z</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; z</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; t</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; no</span>}\frac{\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}{{\mathrm{<span\; class="notranslate">\; z</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; z</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}\\ \mathrm{<span\; class="notranslate">\; \&alpha;</span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}\frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}}{\sqrt{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; z</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; z</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

When the laser is placed at the center of the reflector, define α2 as 0°. When the laser rotates towards the reflector, define α2 as positive at this time. When the laser faces the reflector and is parallel to the reflector, define α2 as π/2; When the laser turns back to the reflector, define α2 as negative. When the laser points to the center of the reflector, define α1 as 0°, and when viewed from top to bottom, counterclockwise is positive.

Finally, the calculated rotation angle of the laser linkage part 2 is sent to the stepping motor to achieve precise positioning of the retinal area. It is fully automatic, easy to operate, and easy to implement, and can perform arbitrary retinal area positioning.

To sum up, the retinal positioning device based on the fundus imaging system of the present invention is ingeniously and uniquely designed, simple in structure, can realize precise positioning of any area of the retina, and has the characteristics of convenient and flexible operation, high precision, etc., and is suitable for large-scale popularization and application.

In this specification, the invention has been described with reference to specific embodiments thereof. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the present invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.

The above descriptions are only preferred implementations of the present utility model, and the protection scope of the present utility model is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present utility model all belong to the protection scope of the present utility model. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims (12)

1. the retina positioner based on eyeground imaging system, comprise imaging system (5), described imaging system (5) comprises eyepiece end and objective end, it is characterized in that, also comprise the laser instrument (1) of adjustable angle, coupling light parts (3) and sighting target parts (4), described coupling light parts (3) are positioned at the eyepiece end of imaging system (5), the imaging line that described coupling light parts (3) and imaging system (5) project forms angle, described sighting target parts (4) comprise reflecting plate (41), described sighting target parts (4) are positioned at the objective end of imaging system (5).

2. a kind of retina positioner based on eyeground imaging system according to claim 1, it is characterized in that, also be provided with laser instrument linkage part (2), described laser instrument (1) is arranged on laser instrument linkage part (2).

3. a kind of retina positioner based on eyeground imaging system according to claim 2, it is characterized in that, described laser instrument linkage part (2) can comprise horizontal rotation structure (21) and luffing structure (22), described horizontal rotation structure (21) comprises feathering axis (211), horizontal rotary swivel base (212) and motor (213), described feathering axis (211) is in transmission connection and horizontal rotary swivel base (212) described in controlling horizontally rotates around this feathering axis (211), described luffing structure (22) comprises pitch axis (221), pitching seat (222) and motor (213), described pitch axis (221) is in transmission connection and pitching seat (222) described in controlling rotates up and down around this pitch axis (221), described laser instrument (1) is arranged on described luffing structure (22).

4. a kind of retina positioner based on eyeground imaging system according to claim 2, it is characterized in that, described laser instrument linkage part (2) can comprise rolling structure (23), luffing structure (22) and pedestal, described rolling structure (23) comprises wobble shaft (231), rolling seat (232) and motor (213), described luffing structure (22) comprises pitch axis (221), pitching seat (222) and motor (213), described laser instrument linkage part (2) is pitching seat (222) from top to bottom, rolling seat (232) and pedestal, described pitch axis (221) is positioned between pitching seat (222) and rolling seat (232), described wobble shaft (231) is positioned between rolling seat (232) and pedestal, described laser instrument (1) is arranged on described luffing structure (22), described wobble shaft (231) is in transmission connection and rolling seat (232) described in controlling rotates up and down around this wobble shaft (231), described pitch axis (221) be in transmission connection and pitching seat (222) described in controlling around this pitch axis (221) left rotation and right rotation.

5. a kind of retina positioner based on eyeground imaging system according to claim 4, is characterized in that, described wobble shaft (231) is vertical with laser instrument linkage part (2) line of centres with described sighting target center.

6. a kind of retina positioner based on eyeground imaging system according to claim 1, it is characterized in that, described coupling light parts (3) comprise bonder (31) and installing rack (32), and described bonder (31) is arranged on installing rack (32).

7. a kind of retina positioner based on eyeground imaging system according to claim 1, it is characterized in that, described coupling light parts (3) comprise bonder (31) and open foraminate lens barrel (33), described lens barrel (33) is arranged on imaging system (5) light-emitting window place, and described bonder (31) is arranged in lens barrel (33).

8. a kind of retina positioner based on eyeground imaging system according to claim 6 or 7, is characterized in that, described bonder (31) is mesopore reflecting mirror or spectroscope.

9. a kind of retina positioner based on eyeground imaging system according to claim 6 or 7, is characterized in that, the imaging light angulation that described bonder (31) and imaging system (5) project is 45 degree.

10. a kind of retina positioner based on eyeground imaging system according to claim 1, it is characterized in that, described sighting target parts (4) also comprise fixed support (42), and described reflecting plate (41) is arranged on fixed support (42).

11. a kind of retina positioners based on eyeground imaging system according to claim 6, it is characterized in that, described reflecting plate (41) is vertical to bonder (31) line of centres with described reflecting plate (41) center.

12. a kind of retina positioners based on eyeground imaging system according to claim 2, it is characterized in that, also comprise control assembly (0) and computer, described control assembly (0) one end connecting laser linkage part (2), the other end connects computer.