Fixing device for assisting fundus image scanning

Abstract

The invention relates to the technical field of medical examination, in particular to a fixing device for assisting fundus image scanning. According to the fixing device for assisting fundus image scanning, head-mounted installation can be achieved, and interference caused by head shaking is avoided; meanwhile, the central position of the eyeball can be tracked in real time according to the real-time condition of the eyeball, a certain correction effect on eyeball rotation, eyeball tremor and the like is achieved, the examination accuracy is improved, meanwhile, infrared marker lamps, an infrared camera and a control unit are arranged at the front end of the shell, the infrared marker lamps distributed in a cross shape are used for generating marks, and the infrared camera is used for controlling the infrared marker lamps to generate the marks. By means of the temperature difference marking mode, damage to eyeballs can be avoided while effective marks are formed, the acceptability is high, the infrared camera can capture the temperature difference marking line image on the cornea, and the temperature difference marking line image captured for the first time is taken as the initial temperature difference marking line image.

Description

Technical Field

[0001] The invention relates to the technical field of medical examination, in particular to a fixing device for assisting fundus image scanning. Background Art

[0002] OCT, also known as optical coherence tomography, is a fast, non-invasive, high-resolution imaging technology. It uses the principle of weak coherent light interference to detect the back reflection or scattering signals of incident light at different depths of biological tissues. By scanning, the structural image of biological tissues can be obtained. The latest OCT technology is the third generation of OCT, called swept source OCT. In recent years, with the rapid development and popularization of OCT technology, it has become an important means to assist doctors in diagnosis in fundus imaging, such as macular examination, retinal examination, etc.

[0003] The existing OCT equipment is usually a desktop structure. When using it, the user rests his head on the head support, stares at the positioning cursor in the center of the mirror to form a position, and then performs OCT examination on the fundus through the mirror. However, this traditional OCT equipment has the following defects: once the center of the eye deviates from the positioning cursor, the detected image will be seriously distorted, which requires a high degree of cooperation from the patient. For children or people with diseases such as nystagmus, due to low compliance and cooperation, the detected fundus images are seriously distorted and even have no reference value. Therefore, how to solve the above problems is an urgent problem to be solved in fundus OCT examination. Summary of the invention

[0004] The purpose of the present invention is to provide a fixing device for assisting fundus image scanning, so as to solve the problem mentioned in the above background technology that the currently available OCT equipment is usually a desktop structure. When in use, the user rests his head on the head support, stares at the positioning cursor in the center of the mirror with his glasses to form a positioning, and then performs an OCT examination on the fundus through the mirror. However, this traditional OCT equipment has the following defects: once the center of the eye deviates from the positioning cursor, the detected image will be seriously distorted, which requires a high degree of cooperation from the patient. For children or people with diseases such as nystagmus, due to low compliance and cooperation, the detected fundus images are seriously distorted and even have no reference value. Therefore, how to solve the above problems is an urgent problem to be solved in fundus OCT examination. To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fixing device for assisting fundus image scanning, comprising a glasses-shaped mounting frame and a detection head arranged on the mounting frame, the mounting frame comprising two frames and a connecting portion arranged between the frames, a tracking mechanism is arranged on the front side of one of the frames, the tracking mechanism comprises a mounting plate, the detection head is arranged on the tracking mechanism and connected to the light source of the OCT host through an optical fiber, the detection head comprises a shell, a reference arm assembly and a sample arm assembly are arranged in the shell, the optical fiber is divided into a reference beam entering the reference arm assembly and a sample beam entering the sample arm assembly by a beam splitter, an ophthalmoscope is arranged at the center of the front end of the shell, The optical path of the sample arm assembly is opposite to and connected to the ophthalmoscope. An infrared marker lamp, an infrared camera and a control unit are arranged at the front end of the shell. There are four infrared marker lamps, and the four infrared marker lamps are distributed in a cross shape with the ophthalmoscope as the center. The four infrared marker lamps can emit cross-shaped infrared marker light toward the user's cornea and form a temperature difference marker line on the cornea. The infrared camera can capture the initial temperature difference marker line image and the real-time temperature difference marker line image on the cornea and transmit them back to the control unit. The control unit controls the movement of the tracking mechanism according to the difference between the real-time temperature difference marker line image and the initial temperature difference marker line image, so as to drive the detection head to track the temperature difference marker line on the cornea.

[0005] Further preferably, a square movable hole is provided in the middle portion of the mounting plate, and arc-shaped guide rails extending laterally are provided on the hole walls at the upper and lower edges of the movable hole, and a mounting frame is provided in the movable hole, and the mounting frame is composed of two mutually parallel beams and a guide rod arranged between the two ends of the beams, the beam is clamped on the arc-shaped guide rail and forms a sliding fit with the arc-shaped guide rail, a horizontal drive push rod is horizontally arranged on the mounting plate, and the telescopic end of the horizontal drive push rod is connected to the beam, and the tracking mechanism also includes a shell sleeve arranged between the two guide rods, and the shell of the detection head is installed in the shell sleeve, and sliding sleeves matching the guide rods are provided at both ends of the shell sleeve, and sliding fit with the guide rods is formed through the sliding sleeves, and a vertical drive push rod is vertically arranged on the beam, and the telescopic end of the vertical drive push rod is connected to the shell sleeve, and the vertical drive push rod and the horizontal drive push rod are both electrically connected to the control unit and controlled by the control unit.

[0006] Further preferably, a central axis is provided on the connecting portion, a rotating sleeve is provided outside the central axis and is rotatably matched with the central axis, the mounting plate is fixedly provided on one side of the rotating sleeve, the mounting plate can change direction on both sides of the central axis following the rotation of the rotating sleeve, a retaining ring is provided on the circumferential surface of the middle part of the rotating sleeve, and a mounting sleeve matched with the rotating sleeve is provided at one end of the mounting plate close to the connecting portion, the mounting sleeve is provided outside the rotating sleeve and is pressed on the retaining ring by a fixing nut, the fixing nut is threadably matched with the rotating sleeve, a positioning protrusion is provided on the retaining ring, and a positioning recess matched with the positioning protrusion is provided on the mounting sleeve.

[0007] Further preferably, the central shaft is a hollow shaft, a commutation motor is arranged inside the central shaft, the rotating end of the commutation motor faces upward, and a drive cap is provided, the lower edge of the drive cap is opposite to the upper edge of the rotating sleeve, and is meshed through key teeth.

[0008] Further preferably, a shielding cover is provided on the side of the rotating sleeve opposite to the mounting plate, and when the detection head is rotated to be opposite to one frame, the shielding cover can shield the other frame, the control unit is a single-chip microcomputer, the mounting frame also includes a headband, and the mounting frame can be fixed to the user's head through the headband, a nose bridge is provided at the connecting portion, and a layer of infrared absorbing film is provided outside the infrared camera.

[0009] Further preferably, an inner groove is opened inside the headband, a first spring is movably connected to one side of the inner groove, a second spring is movably connected to one side of the inner groove, and one end of the first spring and the second spring is fixedly connected to a rubber pad.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] In the present invention, the device is mainly composed of a glasses-shaped mounting frame and a detection head. There are two frames on the mounting frame, and there is a connecting part between them. A tracking mechanism is also installed on the front side of one of the frames. There is a detection head on this tracking mechanism. The detection head is connected to the light source of the OCT host through an optical fiber. There are a reference arm assembly and a sample arm assembly. The light of the optical fiber is divided into two beams by a spectrometer, one beam goes to the reference arm assembly, and the other beam goes to the sample arm assembly. At the front end of the detection head, there are four infrared marking lights, which form a cross around the ophthalmoscope. These four lights will emit cross-shaped infrared marking light toward the user's cornea to form temperature difference marking lines, which can capture these marking line images on the cornea and transmit them back to the control unit.

[0012] In the present invention, the mounting frame can also be fixed to the user's head through a headband. The design of the nose bridge is more considerate, which can make the user wear it more comfortable and prevent infrared interference with the camera. The first spring and the second spring inside the headband can be better fitted to the user's head to improve wearing comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional main structure of the present invention;

[0014] Figure 2 It is a side view structural schematic diagram of the present invention;

[0015] Figure 3 The cross-sectional structure of the present invention is shown in FIG. Figure 1 ;

[0016] Figure 4 The cross-sectional structure of the present invention is shown in FIG. Figure 2 ;

[0017] Figure 5 The cross-sectional structure of the present invention is shown in FIG. Figure 3 ;

[0018] Figure 6 The cross-sectional structure of the present invention is shown in FIG. Figure 4 .

[0019] In the figure: 1. detection head; 2. frame; 3. connection part; 4. optical fiber; 5. shell; 6. ophthalmoscope; 7. infrared marking light; 8. infrared camera; 9. mounting plate; 10. movable hole; 11. arc guide rail; 12. crossbeam; 13. guide rod; 14. horizontal drive push rod; 15. shell; 16. sliding sleeve; 17. vertical drive push rod; 18. central axis; 19. rotating sleeve; 20. retaining ring; 21. mounting sleeve; 22. nut; 23. positioning protrusion; 24. reversing motor; 25. drive cap; 26. shielding cover; 27. headband; 28. nose bridge; 30. inner groove; 31. first spring; 32. rubber cushion; 35. second spring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 - Figure 6 The present invention provides a technical solution: comprising a glasses-shaped mounting frame and a detection head 1 arranged on the mounting frame, the mounting frame comprising two lens frames 2 and a connecting portion 3 arranged between the lens frames 2, a tracking mechanism is arranged on the front side of one lens frame 2, the tracking mechanism comprises a mounting plate 9, the detection head 1 is arranged on the tracking mechanism and connected to the light source of the OCT host through an optical fiber 4, the detection head 1 comprises a shell 5, a reference arm assembly and a sample arm assembly are arranged in the shell 5, the optical fiber 4 is divided into a reference beam entering the reference arm assembly and a sample beam entering the sample arm assembly by a beam splitter, an ophthalmoscope 6 is arranged at the center of the front end of the shell 5, and the optical path of the sample arm assembly is connected to the ophthalmoscope 6 Relative to and conductive, an infrared marking lamp 7, an infrared camera 8 and a control unit are arranged at the front end of the shell 5. There are four infrared marking lamps 7, and the four infrared marking lamps 7 are distributed in a cross shape with the ophthalmoscope 6 as the center. The four infrared marking lamps 7 can emit cross-shaped infrared marking light toward the user's cornea and form a temperature difference marking line on the cornea. The infrared camera 8 can capture the initial temperature difference marking line image and the real-time temperature difference marking line image on the cornea, and transmit them back to the control unit. The control unit controls the action of the tracking mechanism according to the difference between the real-time temperature difference marking line image and the initial temperature difference marking line image, so as to drive the detection head 1 to track the temperature difference marking line on the cornea.

[0022] In this embodiment, Figure 1 and Figure 2As shown, a square movable hole 10 is provided in the middle of the mounting plate 9, and arc-shaped guide rails 11 extending in the transverse direction are provided on the hole walls at the upper and lower edges of the movable hole 10. A mounting frame is provided in the movable hole 10, and the mounting frame is composed of two mutually parallel cross beams 12 and a guide rod 13 provided between the two ends of the cross beam 12. The cross beam 12 is clamped on the arc-shaped guide rail 11 and forms a sliding fit with the arc-shaped guide rail 11. A transverse driving push rod 14 is transversely provided on the mounting plate 9, and the telescopic end of the transverse driving push rod 14 is connected to the cross beam 12. The tracking mechanism further comprises a shell 15 arranged between the two guide rods 13. The housing 5 of the detection head 1 is installed in the shell 15. Slide sleeves 16 cooperating with the guide rods 13 are arranged at both ends of the shell 15, and a sliding fit is formed with the guide rods 13 through the slide sleeves 16. A vertical drive push rod 17 is vertically arranged on the cross beam 12. The telescopic end of the vertical drive push rod 17 is connected to the shell 15. The vertical drive push rod 17 and the horizontal drive push rod 14 are both electrically connected to the control unit and controlled by the control unit.

[0023] In this embodiment, Figure 1 , Figure 3 , Figure 4 and Figure 6 As shown, a central axis 18 is provided on the connecting portion 3, and a rotating sleeve 19 which is rotatably matched with the central axis 18 is provided on the outer sleeve of the central axis 18. The mounting plate 9 is fixedly arranged on one side of the rotating sleeve 19, and the mounting plate 9 can change direction on both sides of the central axis 18 following the rotation of the rotating sleeve 19. A retaining ring 20 is arranged on the circumferential surface of the middle part of the rotating sleeve 19, and a mounting sleeve 21 which is adapted to the rotating sleeve 19 is arranged at one end of the mounting plate 9 close to the connecting portion 3. The mounting sleeve 21 is sleeved outside the rotating sleeve 19 and is pressed on the retaining ring 20 by a fixing nut 22. The fixing nut 22 is threadedly matched with the rotating sleeve 19. A positioning protrusion 23 is arranged on the retaining ring 20, and a positioning groove which matches the positioning protrusion 23 is arranged on the mounting sleeve 21.

[0024] In this embodiment, Figure 1 , Figure 3 and Figure 4 As shown, the central shaft 18 is a hollow shaft, and a reversing motor 24 is arranged inside the central shaft 18. The rotating end of the reversing motor 24 faces upward, and a driving cap 25 is arranged. The lower edge of the driving cap 25 is opposite to the upper edge of the rotating sleeve 19 and is meshed with key teeth.

[0025] In this embodiment, Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a shielding cover 26 is provided on the side of the rotating sleeve 19 opposite to the mounting plate 9. When the detection head 1 is rotated to be opposite to one frame 2, the shielding cover 26 can shield the other frame 2. The control unit is a single-chip microcomputer. The mounting frame also includes a headband 27. The mounting frame can be fixed to the user's head through the headband 27. A nose bridge 28 is provided at the connecting part 3, and a layer of infrared absorption film is provided outside the infrared camera 8.

[0026] In this embodiment, Figure 1 and Figure 2 As shown, an inner groove 30 is opened inside the headband 27, a first spring 31 is movably connected to one side of the inner groove 30, a second spring 35 is movably connected to one side of the inner groove 30, and a rubber cushion 32 is fixedly connected to one end of the first spring 31 and the second spring 35.

[0027] The use method and advantages of the present invention: When the fixing device for assisting fundus image scanning is used, the working process is as follows:

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, first of all, different from the desktop structure of the existing OCT equipment, the present invention generally adopts a head-mounted design, which includes a glasses-shaped mounting frame and a detection head 1 arranged on the mounting frame. The mounting frame includes two frames 2 and a connecting portion 3 arranged between the frames 2. The mounting frame adopts a glasses-like design and can be worn directly on the user's head. The whole frame can rotate with the head, which can effectively avoid interference caused by head movements. The shape design and movement design of the frame 2 should be as ergonomic as possible. A tracking mechanism is provided on the front side of the frame 2. The tracking mechanism is used to carry the detection head 1 and drive the detection head 1 to move to achieve tracking. The detection head 1 is set on the tracking mechanism and is connected to the light source of the OCT host through an optical fiber 4. The detection head 1 of the present invention includes a housing 5. Referring to the traditional OCT equipment, the similarities are that the optical path of the sample arm assembly is opposite to and conductive to the ophthalmoscope 6, and then the four infrared marker lights 7 are distributed in a cross shape with the ophthalmoscope 6 as the center. The cross-shaped infrared marker lamp 7 is used to generate a mark. Specifically, the infrared marker lamp 7 can emit a cross-shaped infrared marker light toward the user's cornea. Through the cornea's absorption of the infrared marker light, the temperature of the irradiated part can rise (without damaging the human body. In theory, the more obvious the temperature rise, the better), thereby forming a temperature difference mark line on the cornea. This temperature difference marking method can avoid damage to the eyeball while forming an effective mark, and has strong acceptability. The infrared camera 8 can capture the temperature difference mark line image on the cornea, and the first capture is the initial temperature difference mark line image, and the subsequent is the real-time temperature difference mark line image, and is transmitted back to the control unit; the control unit can calculate the real-time deviation position of the eyeball based on the difference between the real-time temperature difference mark line image and the initial temperature difference mark line image, and control the tracking mechanism to drive the detection head to track the temperature difference mark line on the cornea, and finally form a tracking of the initial position of the eyeball. This method can correct the position error caused by eyeball rotation and nystagmus to a certain extent, greatly improving the accuracy of detection. In order to achieve better lightweight, the control unit can be a single-chip microcomputer. Of course, due to safety considerations, the temperature difference of the temperature difference marking line should not be too large, and should be within the acceptable intensity of the human eye. Therefore, in order to amplify the temperature difference and enhance the sensitivity to the temperature difference marking line, the present invention can also provide a layer of infrared absorption film outside the infrared camera 8. In this case, the infrared absorption film can act as a signal amplification film.For example: when the infrared intensity is digitized, the infrared intensity of the temperature difference mark line is 35, while the infrared intensity of the cornea in the non-infrared mark line area is 30. At this time, the difference between the two is 5 / 30=16.7%. If an infrared absorption film with an infrared absorption value of 25 is used for absorption, the infrared intensity of the temperature difference mark line is 10, while the infrared intensity of the cornea in the non-infrared mark line area is 5. At this time, the difference rate between the two is 5 / 10=50%. In this way, the temperature difference can be judged more sensitively, thereby ensuring accuracy. The tracking mechanism of the present invention is used to drive the detection head 1 to move according to the temperature difference mark line. Due to the head-mounted installation, it should have lightweight characteristics in material selection. The tracking mechanism of the present invention includes a mounting plate 9, and a square active hole 10 is set in the middle of the mounting plate 9. The active hole 10 serves as the activity space of the detection head 1 when tracking. The vertical drive push rod 17 and the horizontal drive push rod 14 are both electrically connected to the control unit and controlled by the control unit. By controlling the vertical drive push rod 17 and the horizontal drive push rod 14, the present invention can drive the detection head 1 to adjust its position in the movable hole 10 to meet the tracking requirements. For the sake of clarity and simplicity, the arc guide rail 11 and the guide rod 13 shown in the figure are arc-shaped. The connecting part 3 of the present invention is provided with a central axis 18, and the central axis 18 is provided with a rotating sleeve 19 that forms a rotational match with the central axis 18. The mounting plate 9 is fixedly arranged on one side of the rotating sleeve 19. The mounting plate 9 can change direction on both sides of the central axis 18 following the rotation of the rotating sleeve 19. Since the present invention generally belongs to a precision optical component, it requires more maintenance in the later stage. In order to facilitate the maintenance of the detection head 1, the mounting plate 9 is preferably selected to be detachably arranged on the mounting frame. Its specific structure can be that a retaining ring 20 is arranged on the peripheral surface of the middle part of the rotating sleeve 19, and a mounting sleeve 21 adapted to the rotating sleeve 19 is arranged on the end of the mounting plate 9 close to the connecting part 3, and the mounting sleeve 21 is sleeved outside the rotating sleeve 19 and pressed on the retaining ring 20 through a fixing nut 22. The locking nut 22 is threadedly matched with the rotating sleeve 19. Of course, in order to form a good positioning, a positioning protrusion 23 is provided on the retaining ring 20, and a positioning recess matched with the positioning protrusion 23 is provided on the mounting sleeve 21. When performing circumferential operation, the present invention can adopt manual reversing or electric reversing. Here, the latter is taken as an example. The central shaft 18 of the present invention can be designed as a hollow shaft, and a reversing motor 24 is provided inside the central shaft 18. The rotating end of the reversing motor 24 faces upward and is provided with a driving cap 25. The lower edge of the driving cap 25 is opposite to the upper edge of the rotating sleeve 19 and is meshed by key teeth. When in use, the reversing motor 24 drives the starting cap 25 to rotate, and the driving cap 25 drives the rotating sleeve 19 to rotate, thereby driving the mounting sleeve 21 and the mounting plate 9 to rotate.To realize the reversing operation of the detection head 1, since the present invention can only perform monocular inspection at the same time, in order to prevent visual interference of the other eye and improve comfort, a shielding cover 26 is provided on the side of the rotating sleeve 19 opposite to the mounting plate 9. When the detection head 1 is rotated to be opposite to one frame 2, the shielding cover 26 can block the other frame 2. The first spring 31, the second spring 35 and the rubber pad connected in the inner groove 30 opened inside the headband 27 can well fix different head shapes.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A fixing device for assisting fundus image scanning, characterized in that: The invention comprises a glasses-shaped mounting frame and a detection head (1) arranged on the mounting frame, wherein the mounting frame comprises two lens frames (2) and a connecting portion (3) arranged between the lens frames (2), a tracking mechanism is arranged on the front side of one of the lens frames (2), the tracking mechanism comprises a mounting plate (9), the detection head (1) is arranged on the tracking mechanism and is connected to a light source of an OCT host through an optical fiber (4), the detection head (1) comprises a housing (5), a reference arm assembly and a sample arm assembly are arranged in the housing (5), the optical fiber (4) is divided into a reference light beam entering the reference arm assembly and a sample light beam entering the sample arm assembly through a beam splitter, an ophthalmoscope (6) is arranged at the center of the front end of the housing (5), and the optical path of the sample arm assembly is connected to the ophthalmoscope. The housing (5) is provided with an infrared marking lamp (7), an infrared camera (8) and a control unit at the front end thereof. The housing (5) is provided with four infrared marking lamps (7), and the four infrared marking lamps (7) are distributed in a cross shape with the ophthalmoscope (6) as the center. The four infrared marking lamps (7) can emit cross-shaped infrared marking light rays toward the cornea of ​​the user and form a temperature difference marking line on the cornea. The infrared camera (8) can capture an initial temperature difference marking line image and a real-time temperature difference marking line image on the cornea and transmit them back to the control unit. The control unit controls the movement of the tracking mechanism according to the difference between the real-time temperature difference marking line image and the initial temperature difference marking line image, so as to drive the detection head (1) to track the temperature difference marking line on the cornea.

2. A fixing device for assisting fundus image scanning according to claim 1, characterized in that: A square movable hole (10) is arranged in the middle of the mounting plate (9), and arc-shaped guide rails (11) extending in the transverse direction are arranged on the hole walls at the upper and lower edges of the movable hole (10). A mounting frame is arranged in the movable hole (10), and the mounting frame is composed of two mutually parallel cross beams (12) and a guide rod (13) arranged between the two ends of the cross beam (12). The cross beam (12) is clamped on the arc-shaped guide rail (11) and forms a sliding fit with the arc-shaped guide rail (11). A transverse driving push rod (14) is arranged in the transverse direction on the mounting plate (9), and the telescopic end of the transverse driving push rod (14) is in contact with the cross beam (12). ), the tracking mechanism also includes a shell (15) arranged between the two guide rods (13), the housing (5) of the detection head (1) is installed in the shell (15), both ends of the shell (15) are provided with sliding sleeves (16) matched with the guide rods (13), and the sliding sleeves (16) and the guide rods (13) are formed into a sliding fit, a vertical drive push rod (17) is vertically arranged on the crossbeam (12), the telescopic end of the vertical drive push rod (17) is connected to the shell (15), and the vertical drive push rod (17) and the horizontal drive push rod (14) are both electrically connected to the control unit and controlled by the control unit.

3. The fixing device for assisting fundus image scanning according to claim 2, characterized in that: The connecting portion (3) is provided with a central axis (18), and the central axis (18) is provided with a rotating sleeve (19) which is rotatably matched with the central axis (18). The mounting plate (9) is fixedly arranged on one side of the rotating sleeve (19), and the mounting plate (9) can change direction on both sides of the central axis (18) following the rotation of the rotating sleeve (19). A retaining ring (20) is arranged on the peripheral surface of the middle part of the rotating sleeve (19). An mounting sleeve (21) which is matched with the rotating sleeve (19) is arranged at one end of the mounting plate (9) close to the connecting portion (3). The mounting sleeve (21) is sleeved outside the rotating sleeve (19) and is pressed on the retaining ring (20) through a fixing nut (22). The fixing nut (22) is threadedly matched with the rotating sleeve (19). A positioning protrusion (23) is arranged on the retaining ring (20), and a positioning recess which matches with the positioning protrusion (23) is arranged on the mounting sleeve (21).

4. The fixing device for assisting fundus image scanning according to claim 3, characterized in that: The central shaft (18) is a hollow shaft. A reversing motor (24) is arranged inside the central shaft (18). The rotating end of the reversing motor (24) faces upward and is provided with a driving cap (25). The lower edge of the driving cap (25) is opposite to the upper edge of the rotating sleeve (19) and is meshed with key teeth.

5. The fixing device for assisting fundus image scanning according to claim 4, characterized in that: A shielding cover (26) is arranged on the side of the rotating sleeve (19) opposite to the mounting plate (9); when the detection head (1) rotates to face one of the frames (2), the shielding cover (26) can shield the other frame (2); the control unit is a single-chip microcomputer; the mounting frame also includes a headband (27); the mounting frame can be fixed to the user's head by the headband (27); a nose bridge (28) is arranged at the connecting portion (3); and a layer of infrared absorbing film is arranged outside the infrared camera (8).

6. The fixing device for assisting fundus image scanning according to claim 5, characterized in that: The headband (27) has an inner groove (30) formed inside, and one side of the inner groove (30) is movable. A first spring (31) is movably connected to the inner groove (30), and a second spring (35) is movably connected to one side of the inner groove (30). One end of the first spring (31) and the second spring (35) is fixedly connected to a rubber cushion (32).

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