Head fixing device for ophthalmic examination

Abstract

The utility model discloses a head fixing device for ophthalmic examination, which relates to the technical field of medical instruments and comprises a head support frame and a U-shaped frame. The adjusting unit comprises a sliding sleeve rod arranged at the bottom of the head supporting frame in a penetrating mode, an extrusion sleeve rod arranged on the inner side of the sliding sleeve rod in a sleeving mode, a reset piece arranged between the lower jaw bracket and the sliding sleeve rod, and a ball penetrating through the side wall of the sliding sleeve rod. And the telescopic unit comprises a screw rod and a threaded sleeve matched with the screw rod, a V-shaped groove is formed in the screw rod, and the end of the sliding sleeve rod extends to the inner side of the screw rod. When the head of the patient leaves the lower jaw bracket, the reset piece releases elastic potential energy to push the conical head to move in the direction away from the ball, so that the ball can move towards the inner wall of the sliding sleeve rod when being extruded by the inner wall of the V-shaped groove; and then the sliding sleeve rod moves downwards under the influence of self weight, so that the lower jaw bracket is moved to a lower position.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field especially a head fixing device for ophthalmic examination. BACKGROUND

[0002] In the field of ophthalmic medical diagnosis, automatic computer optometry instrument has become one of the important equipment for checking the diopter of eyes. The automatic computer optometry instrument realizes the measurement of the diopter of eyes by relying on the precise optical sensing system. In order to ensure the measurement accuracy, the vertex of the cornea of the patient is usually placed at a specific working distance and a specified height of the optical path of the equipment, so that the visual axis of the patient and the optical axis of the instrument can be as coincident as possible.

[0003] At present, in order to realize the requirement of the positioning height of the eyes of the patient, the mechanical adjustment mode is usually adopted to change the position of the eyes of the patient by adjusting the height of the mandibular bracket. The doctor can manually adjust the height of the mandibular bracket according to the difference of the head shape and the length of the face of each patient. Specifically, in order to facilitate the new patient to place the head on the bracket, the doctor usually first lowers the mandibular bracket to a lower initial position. After the patient is in position and places the chin on the bracket, the bracket is slowly adjusted upward, and at the same time, the doctor visually judges whether the outer corner of the eye of the patient is flush with the alignment mark line on the side of the equipment. If the outer corner of the eye of the patient is flush with the alignment mark line, it indicates that the eyes of the patient are at the appropriate height.

[0004] However, in the continuous diagnosis and treatment process, the doctor usually needs to repeatedly perform the mandibular bracket adjustment process of "first lowering and then raising" for each new patient. Since a single doctor needs to interface with multiple patients, such repeated operation not only increases the labor burden of the doctor, but also reduces the work efficiency of the doctor in the vision detection of the patient. CONTENT OF THE UTILITY MODEL

[0005] Therefore, the technical problem to be solved by the utility model lies in that the existing head fixing device needs to be repeatedly adjusted to complete the support of the head of the patient, which leads to a large labor intensity of the doctor and affects the work efficiency of the vision detection.

[0006] The above technical problem is solved by the following technical scheme. The utility model provides a head fixing device for ophthalmic examination, which comprises a head support frame, a U-shaped frame, a mandibular bracket, an adjusting unit and a telescopic unit.

[0007] The mandibular bracket is arranged on the inner side of the contour of the head support frame.

[0008] The adjusting unit comprises a sliding sleeve rod arranged through the bottom of the head support frame, an extrusion sleeve rod arranged in the inner side of the sliding sleeve rod, a reset member arranged between the mandibular bracket and the sliding sleeve rod, and a ball arranged through the side wall of the sliding sleeve rod.

[0009] The telescopic unit comprises a screw rod and a threaded sleeve matched with the screw rod, the screw rod is internally provided with a V-shaped groove, and the end of the sliding sleeve rod away from the head support frame extends to the inside of the V-shaped groove.

[0010] In a preferred embodiment of the head fixing device for ophthalmic examination, the head support frame and the U-shaped frame are fixedly connected with the optometry platform.

[0011] The extrusion sleeve rod is fixedly connected with the mandibular bracket.

[0012] The inner wall of the sliding sleeve rod is fixedly connected with a sliding rail, and the outer wall of the extrusion sleeve rod is provided with a sliding groove matched with the sliding rail of the sliding sleeve rod.

[0013] In a preferred embodiment of the head fixing device for ophthalmic examination, the sliding sleeve rod is provided with a through hole communicated with the inside of the V-shaped groove, and the diameter of the ball is slightly larger than the inner diameter of the through hole.

[0014] The outer wall of the tapered head extrudes the ball, and the ball is locally pushed to penetrate the through hole and extend to the outside of the sliding sleeve rod.

[0015] In a preferred embodiment of the head fixing device for ophthalmic examination, the end of the sliding sleeve rod close to the mandibular bracket is provided with an extension plate.

[0016] The reset member is a spring, one end of the reset member abuts against the mandibular bracket, and the other end of the reset member away from the mandibular bracket abuts against the sliding sleeve rod.

[0017] The sliding sleeve rod reciprocates linearly along the axial direction thereof.

[0018] In a preferred embodiment of the head fixing device for ophthalmic examination, the bottom of the U-shaped frame is provided with a bearing seat.

[0019] The threaded sleeve is in interference fit with the bearing seat, the screw rod penetrates the threaded sleeve and extends to the outside of the threaded sleeve.

[0020] The threaded sleeve can drive the screw rod to move in the vertical direction.

[0021] In a preferred embodiment of the head fixing device for ophthalmic examination, the reset member can push the mandibular bracket to move away from the sliding sleeve rod.

[0022] When the tapered head is away from the ball, the sliding sleeve rod can move towards the screw rod under the action of gravity.

[0023] The rolling ball is extruded by the inner wall of the V-shaped groove and moves to the inner wall of the sliding sleeve rod.

[0024] In a preferred embodiment of the head fixing device for ophthalmic examination, when the mandibular bracket bears the weight of the patient's head, it can drive the extrusion sleeve rod to move downward.

[0025] The tapered head extrudes the rolling ball, the rolling ball moves from the inner wall to the outer wall of the sliding sleeve rod, and the rolling ball abuts against the inner wall of the V-shaped groove.

[0026] In a preferred embodiment of the head fixing device for ophthalmic examination, a connecting sleeve is installed at the bottom of the threaded sleeve.

[0027] The outer side of the connecting sleeve is connected with a transmission member.

[0028] In a preferred embodiment of the head fixing device for ophthalmic examination, a soft pad is arranged at the top of the inner side of the head support frame.

[0029] In a preferred embodiment of the head fixing device for ophthalmic examination, a sliding plane is arranged on the side wall of the sliding sleeve rod.

[0030] The head fixing device for ophthalmic examination has the following beneficial effects: when the patient's head moves away from the mandibular bracket, the elastic potential energy released by the reset member can push the tapered head to move away from the rolling ball, so that the rolling ball can move to the inner wall of the sliding sleeve rod when it is extruded by the inner wall of the V-shaped groove; then the sliding sleeve rod moves downward under the influence of its own weight, thereby realizing the automatic movement of the mandibular bracket to a lower position, avoiding manual adjustment of the mandibular bracket by the doctor, and relieving the labor intensity of the doctor. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments of the present application will be briefly introduced below; obviously, the drawings described below only relate to some embodiments of the present application, and are not a limitation on the present application.

[0032] Figure 1 A perspective structural schematic view of the head fixing device is shown;

[0033] Figure 2 A top view of the head fixing device is shown;

[0034] Figure 3 A sectional view of A-A of Figure 2 is shown;

[0035] Figure 4 A partial structure enlarged view of B of Figure 3 is shown;

[0036] Figure 5 An exploded structural schematic diagram of the head fixing device is shown.

[0037] In the figure: 1, head support frame; 2, U-shaped frame; 3, mandibular bracket; 4, adjusting unit; 41, sliding sleeve rod; 411, through hole; 42, extrusion sleeve rod; 421, taper head; 43, reset member; 44, ball; 5, telescopic unit; 51, screw rod; 511, V-shaped groove; 52, threaded sleeve; 53, connecting sleeve; 6, bearing seat. DETAILED DESCRIPTION

[0038] In order to make the person skilled in the art better understand the utility model, the utility model will be further described in detail in combination with specific embodiments and drawings.

[0039] The terms used in the utility model are those general terms currently widely used in the art in consideration of the functions regarding the utility model, but the terms can be changed according to the intention, precedent or new technology of the person skilled in the art in the art. In addition, specific terms can be selected by the applicant, and in this case, the detailed meaning thereof will be described in the detailed description of the utility model. Therefore, the terms used in the specification should not be understood as simple names, but based on the meaning of the terms and the overall description of the utility model.

[0040] Referring to Figures 1-5 , the embodiment provides a head fixing device for ophthalmic examination, which comprises a head support frame 1, a U-shaped frame 2, a mandibular bracket 3, an adjusting unit 4 and a telescopic unit 5.

[0041] The mandibular bracket 3 is arranged on the inner side of the contour of the head support frame 1.

[0042] It should be noted that the head support frame 1 is a ring-shaped rectangular structure, and the side wall at the top of the head support frame 1 is folded into a vertical state to ensure that the forehead of the patient can be closely attached to the side wall of the head support frame 1. The mandibular bracket 3 is arranged on the inner side of the head support frame 1, and the height of the mandibular bracket 3 is adjustable. When the vision of the patient needs to be detected, the chin of the patient is placed on the mandibular bracket 3, and the forehead of the patient is in contact with the side wall at the top of the head support frame 1, so that the comfort of supporting the head of the patient is improved, and the stability of the position of the head of the patient is ensured.

[0043] Further, the adjusting unit 4 comprises a sliding sleeve rod 41 arranged through the bottom of the head support frame 1, an extrusion sleeve rod 42 sleeved on the inner side of the sliding sleeve rod 41, a reset member 43 arranged between the mandibular bracket 3 and the sliding sleeve rod 41, and a ball 44 arranged through the side wall of the sliding sleeve rod 41; the telescopic unit 5 comprises a screw rod 51 and a threaded sleeve 52 matched with the screw rod 51, and a V-shaped groove 511 is formed in the inner side of the screw rod 51, and the end of the sliding sleeve rod 41 away from the head support frame 1 extends to the inner side of the V-shaped groove 511.

[0044] It should be noted that the inner side of the sliding sleeve rod 41 is hollow, the sliding sleeve rod 41 is coaxially arranged with the extrusion sleeve rod 42, the sliding sleeve rod 41 and the extrusion sleeve rod 42 are in sliding fit, and the extrusion sleeve rod 42 can move along the vertical direction of the sliding sleeve rod 41.

[0045] Specifically, the sliding sleeve rod 41 extends through the bottom of the head support frame 1 and extends to the outer side of the head support frame 1, and one end of the extrusion sleeve rod 42 is connected with the mandibular bracket 3, and the mandibular bracket 3 can be driven to move upward synchronously while the extrusion sleeve rod 42 moves upward.

[0046] The end of the sliding sleeve rod 41 away from the head support frame 1 extends to the inner side of the V-shaped groove 511, and when the extrusion sleeve rod 42 extrudes the ball 44 and makes the ball 44 extend to the outer side of the sliding sleeve rod 41, the outer wall of the ball 44 can abut against the inner wall of the V-shaped groove 511; at this time, since the size of the V-shaped groove 511 in the downward direction is reduced, the ball 44 abuts against the inner wall of the V-shaped groove 511, and the sliding sleeve rod 41 is limited from moving downward by the cooperation of the ball 44 and the V-shaped groove 511, and the screw rod 51 moves upward while driving the sliding sleeve rod 41 to move upward synchronously.

[0047] In use, when the head of the patient moves away from the mandibular bracket 3, the reset member 43 releases the elastic potential energy and drives the mandibular bracket 3 to move away from the sliding sleeve rod 41, and the mandibular bracket 3 moves to drive the end of the extrusion sleeve rod 42 abutting against the outer wall of the ball 44 to move away from the ball 44; at this time, the sliding sleeve rod 41 and the extrusion sleeve rod 42 move downward under the influence of their own weight, and since the extrusion sleeve rod 42 no longer abuts against the ball 44, the ball 44 moves to the inner wall of the sliding sleeve rod 41 under the extrusion of the inner wall of the V-shaped groove 511 during the downward movement of the sliding sleeve rod 41, so as to release the limitation of the ball 44 on the downward movement of the sliding sleeve rod 41; the downward movement of the sliding sleeve rod 41 drives the mandibular bracket 3 connected with the extrusion sleeve rod 42 to move downward synchronously, so that the mandibular bracket 3 moves downward to the initial position; after the head of the patient moves away from the mandibular bracket 3, the device can automatically adjust the position of the mandibular bracket 3, so that the mandibular bracket 3 returns to the initial position, and the doctor does not need to manually lower the height of the mandibular bracket 3, thereby reducing the operation burden of the staff.

[0048] Reference Figures 1-5In one embodiment of the utility model, including, head support frame 1 and U-shaped frame 2 are all fixedly connected with optometry platform;Extrusion sleeve rod 42 is fixedly connected with lower jaw bracket 3;The inner wall of sliding sleeve rod 41 is fixedly connected with slide rail, and the outer wall of extrusion sleeve rod 42 is provided with the sliding slot matched with the slide rail of sliding sleeve rod 41.

[0049] It should be noted that the head support frame 1 and the U-shaped frame 2 are fixedly connected with the optometry platform by bolts;The inside of the extrusion sleeve rod 42 is a hollow structure, the bottom of the lower jaw bracket 3 is provided with a connecting shaft, and the connecting shaft is sleeved on the inside of the extrusion sleeve rod 42, and the connecting shaft and the extrusion sleeve rod 42 are connected and fixed by the screw penetrating through the side wall of the sleeve rod 42.

[0050] Specifically, in order to ensure that the extrusion sleeve rod 42 and the sliding sleeve rod 41 can slide relative to each other, the inner wall of the sliding sleeve rod 41 is fixedly connected with a guide rail by bolts, and the outer wall of the extrusion sleeve rod 42 is provided with a sliding groove, and the sliding groove is matched with the guide rail to further limit the axial movement direction of the extrusion sleeve rod 42, so that the extrusion sleeve rod 42 can move vertically relative to the sliding sleeve rod 41.

[0051] And the vertical direction of the embodiment is parallel to the axis direction of the sliding sleeve rod 41.

[0052] Further, the end of the extrusion sleeve rod 42 away from the lower jaw bracket 3 is provided with a tapered head 421;The side wall of the sliding sleeve rod 41 is provided with a through hole 411, the ball 44 is matched with the through hole 411;The outer wall of the tapered head 421 extrudes the ball 44, so that the ball 44 can penetrate the through hole 411 and extend to the outer wall of the sliding sleeve rod 41.

[0053] It should be noted that the tapered head 421 and the extrusion sleeve rod 42 are fixedly connected by screws, and the bottom side wall of the sliding sleeve rod 41 away from the lower jaw bracket 3 is provided with a through hole 411, and the diameter of the ball 44 is slightly larger than the inner diameter of the through hole 411;The ball 44 can further move to penetrate the through hole 411 and extend to the outside of the sliding sleeve rod 41 under the extrusion of the tapered head 421;When the tapered head 421 no longer extrudes the ball 44, the movement limit of the ball 44 to the inside of the sliding sleeve rod 41 is released, and the ball 44 moves to the inner wall of the sliding sleeve rod 41 under the extrusion of the V-shaped groove 511;When the ball 44 is not extruded by the tapered head 421, the limit of the sliding sleeve rod 41 is released, and the sliding sleeve rod 41 can further move downward under the influence of its own gravity.

[0054] Further, the end of the sliding sleeve rod 41 close to the lower jaw bracket 3 is provided with an extension plate;The reset member 43 is a spring, one end of the reset member 43 abuts against the lower jaw bracket 3, and the other end abuts against the sliding sleeve rod 41;The sliding sleeve rod 41 reciprocates linearly along its axis direction.

[0055] It should be noted that the sliding sleeve rod 41 is provided with an extension plate at one end close to the mandibular bracket 3, and the extension plate can further limit the trajectory of the downward movement of the sliding sleeve rod 41, so as to avoid the sliding sleeve rod 41 from being separated from the head support frame 1 during the downward movement.

[0056] Specifically, the sliding sleeve rod 41 penetrates the bottom surface of the head support frame 1 and extends to the inner side of the head support frame 1, the outer wall of the sliding sleeve rod 41 is provided with a sliding rail, and the sliding rail cooperates with the inner sliding groove of the head support frame 1, which can further limit the movement trajectory of the sliding sleeve rod 41, and ensure that the sliding sleeve rod 41 can only move in a vertical direction.

[0057] Further, the bottom of the U-shaped frame 2 is provided with a bearing seat 6; the threaded sleeve 52 cooperates with the bearing seat 6, the screw rod 51 penetrates the threaded sleeve 52 and extends to the outer side thereof; the threaded sleeve 52 rotates and can drive the screw rod 51 to move in a vertical direction.

[0058] It should be noted that the bearing seat 6 is fixed with the U-shaped frame 2 by bolts, and the bottom of the U-shaped frame 2 is provided with a through hole, the outer wall of the threaded sleeve 52 is in interference fit with the inner diameter of the bearing seat 6, so as to realize that the rotation of the threaded sleeve 52 synchronously drives the screw rod 51 to move in a vertical direction.

[0059] In use, the patient's head is placed above the mandibular bracket 3, the mandibular bracket 3 is moved downward under the influence of the gravity of the patient's head, and the mandibular bracket 3 drives the extrusion sleeve rod 42 to move downward, the downward movement of the extrusion sleeve rod 42 can extrude the ball 44 to make the ball 44 penetrate the outer side of the sliding sleeve rod 41; at this time, the ball 44 abuts against the inner wall of the V-shaped groove 511, and since the size of the tapered opening of the V-shaped groove 511 increases from bottom to top, the ball 44 will limit the further downward movement of the sliding sleeve rod 41 after abutting against the inner wall of the V-shaped groove 511; then the threaded sleeve 52 is driven to rotate to synchronously drive the screw rod 51 to move upward, the upward movement of the screw rod 51 can drive the sliding sleeve rod 41 to synchronously move upward, and the upward movement of the sliding sleeve rod 41 can drive the extrusion sleeve rod 42 to synchronously move upward, and the upward movement of the extrusion sleeve rod 42 can drive the mandibular bracket 3 to move upward, so as to facilitate the doctor to adjust the patient's eyes to a suitable height.

[0060] When the height of the patient's eyes is adjusted too high, the threaded sleeve 52 can be reversely driven to rotate to drive the screw rod 51 to move downward, at this time, the screw rod 51 does not drive the sliding sleeve rod 41 to synchronously move downward, and the load received by the doctor during the downward movement of the screw rod 51 is small, and the operation is easier; during the downward movement of the screw rod 51, the sliding sleeve rod 41 will synchronously move downward with the screw rod 51 due to the influence of the gravity of the patient's head which is always placed above the mandibular bracket 3, so as to realize the adjustment of the height position of the patient's head.

[0061] Reference Figures 1-5 Figures 1-5In some embodiments, the reset member 43 can push the mandibular bracket 3 to move away from the sliding sleeve rod 41; the conical head 421 moves away from the ball 44, and the sliding sleeve rod 41 moves towards the screw rod 51 under the action of gravity; the ball 44 is extruded by the inner wall of the V-shaped groove 511 to move towards the inner wall of the sliding sleeve rod 41.

[0062] It should be noted that under normal circumstances, the reset member 43 can push the mandibular bracket 3 to move the extrusion sleeve rod 42 away from the sliding sleeve rod 41, so that the conical head 421 no longer abuts against the ball 44, and the ball 44 is no longer limited by the conical head 421; due to the extrusion of the ball 44 by the inner wall of the V-shaped groove 511, the ball 44 moves towards the inner wall of the sliding sleeve rod 41; at this time, the sliding sleeve rod 41 can move towards the screw rod 51 under the action of gravity.

[0063] Further, the mandibular bracket 3 carrying the weight of the patient's head can drive the extrusion sleeve rod 42 to move downwards; the conical head 421 moves towards and extrudes the ball 44 to move towards the outer wall of the sliding sleeve rod 41, and the ball 44 abuts against the inner wall of the V-shaped groove 511.

[0064] Specifically, the V-shaped groove 511 is arranged along the vertical direction with a relatively long depth, which can ensure that the ball 44 always abuts against the inner wall of the V-shaped groove 511 when the conical head 421 abuts against the ball 44 to move the ball 44 to penetrate to the outside of the sliding sleeve rod 41; when the ball 44 is located at the top position of the V-shaped groove 511, the inner opening diameter of the V-shaped groove 511 is relatively large at this time, and the distance that the ball 44 moves to penetrate to the outer wall of the sliding sleeve rod 41 under the extrusion of the conical head 421 is relatively long; when the ball 44 is located at the bottom position of the V-shaped groove 511, the distance that the ball 44 moves to penetrate to the outer wall of the sliding sleeve rod 41 under the extrusion of the conical head 421 is relatively short; when the sliding sleeve rod 41 is located inside the V-shaped groove 511, the ball 44 abuts against the inner wall of the V-shaped groove 511 at any height position, and the sliding sleeve rod 41 can be limited to move upwards synchronously with the screw rod 51.

[0065] Further, the bottom of the threaded sleeve 52 is provided with a connecting sleeve 53, and the outer side of the connecting sleeve 53 is connected with a transmission member.

[0066] It should be noted that the connecting sleeve 53 is provided with a connecting key on the outer side, and the connecting sleeve 53 and the transmission member can rotate synchronously through the key groove cooperation.

[0067] Further, the inner side of the head support frame 1 is provided with a soft pad at the top.

[0068] It should be noted that the support of the soft pad can effectively prevent the patient's forehead from being scratched, and ensure the comfort of the patient during the examination.

[0069] Further, the side wall of the sliding sleeve rod 41 is provided with a sliding plane; the side wall of the sliding sleeve rod 41 is provided with the sliding plane, so that the movement of the sliding sleeve rod 41 in the vertical direction is further limited.

[0070] In use, after the head of the patient is away from the mandibular support 3, the reset member 43 releases the elastic potential energy to push the mandibular support 3 and drive the extrusion sleeve rod 42 to move away from the sliding sleeve rod 41, and the conical head 421 moves upward synchronously with the extrusion sleeve rod 42, and the conical head 421 no longer interferes with the ball 44 after moving upward; at this time, the ball 44 is no longer limited, and the ball 44 moves to the direction close to the inner wall of the sliding sleeve rod 41 due to the extrusion of the inner wall of the V-shaped groove 511; after the sliding sleeve rod 41 is no longer limited by the ball 44, the sliding sleeve rod 41 moves downward under the influence of its own gravity, and as the sliding sleeve rod 41 continuously moves to the bottom of the V-shaped groove 511, the ball 44 gradually moves closer to the inner wall of the sliding sleeve rod 41; when the extension plate of the sliding sleeve rod 41 abuts against the bottom surface of the head support frame 1, the sliding sleeve rod 41 will no longer continue to move downward, and the sliding sleeve rod 41 will extrude the sleeve rod 42 while moving downward, and the mandibular support 3 is also driven to move downward synchronously, so as to ensure that the mandibular support 3 returns to the initial lower position.

[0071] Finally, it should be pointed out that the methods and devices described in detail above are only embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present application.

[0072] Importantly, the above embodiments are only used to illustrate the technical solutions of the present application and not to limit it, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A head fixation device for ophthalmic examinations, characterized in that: Head support frame (1), U-shaped frame (2), mandibular bracket (3), adjusting unit (4) and telescopic unit (5) are included. The mandibular bracket (3) is arranged on the inner side of the profile of the head support frame (1). The adjusting unit (4) includes a sliding sleeve rod (41) arranged through the bottom of the head support frame (1), an extrusion sleeve rod (42) arranged in the inner side of the sliding sleeve rod (41), a reset member (43) arranged between the mandibular bracket (3) and the sliding sleeve rod (41), and a ball (44) arranged through the side wall of the sliding sleeve rod (41). The telescopic unit (5) includes a screw rod (51) and a threaded sleeve (52) matched with the screw rod (51), and the screw rod (51) is internally provided with a V-shaped groove (511), and the end of the sliding sleeve rod (41) away from the head support frame (1) extends to the inner side of the V-shaped groove (511).

2. The head fixing device for ophthalmic examination according to claim 1, wherein: The head support frame (1) and the U-shaped frame (2) are fixedly connected with the optometry platform; The extrusion sleeve rod (42) is fixedly connected with the mandibular bracket (3); The inner wall of the sliding sleeve rod (41) is fixedly connected with a sliding rail, and the outer wall of the extrusion sleeve rod (42) is provided with a sliding groove matched with the sliding rail of the sliding sleeve rod (41).

3. The head fixing device for ophthalmic examination according to claim 2, wherein: The end of the extrusion sleeve rod (42) away from the mandibular bracket (3) is provided with a tapered head (421); The side wall of the sliding sleeve rod (41) is provided with a through hole (411) in communication with the inside of the V-shaped groove (511), and the diameter of the ball (44) is slightly larger than the inner diameter of the through hole (411); The tapered head (421) extrudes the ball (44), which can push the ball (44) to partially penetrate the through hole (411) and extend to the outside of the sliding sleeve rod (41).

4. The head fixing device for ophthalmic examination according to claim 3, wherein: The end of the sliding sleeve rod (41) close to the mandibular bracket (3) is provided with an extension plate; The reset member (43) is a spring, one end of the reset member (43) abuts against the mandibular bracket (3), and the other end of the reset member (43) away from the mandibular bracket (3) abuts against the sliding sleeve rod (41); The sliding sleeve rod (41) reciprocates linearly along its axial direction.

5. The head fixing device for ophthalmic examination according to claim 4, wherein: The bottom of the U-shaped frame (2) is provided with a bearing seat (6); The threaded sleeve (52) is in interference fit with the bearing seat (6), the screw rod (51) penetrates through the threaded sleeve (52) and extends to the outside of the threaded sleeve (52); The threaded sleeve (52) rotates to drive the screw rod (51) to move in the vertical direction.

6. The head fixing device for ophthalmic examination according to claim 5, wherein: The reset member (43) can push the lower jaw bracket (3) to move away from the sliding sleeve rod (41); When the taper head (421) is away from the ball (44), the sliding sleeve rod (41) can move to the direction of the screw rod (51) under the action of gravity; The ball (44) is extruded by the inner wall of the V-shaped groove (511) and moves to the inner wall of the sliding sleeve rod (41).

7. The head fixation device for ophthalmic examination according to claim 5, wherein: When the lower jaw bracket (3) bears the weight of the patient's head, it can drive the extrusion sleeve rod (42) to move downward; The taper head (421) is close to and extrudes the ball (44), the ball (44) moves from the inner wall to the outer wall of the sliding sleeve rod (41), and the ball (44) abuts against the inner wall of the V-shaped groove (511).

8. The head fixation device for ophthalmic examination according to claim 7, wherein: The bottom of the threaded sleeve (52) is provided with a connecting sleeve (53); The outer side of the connecting sleeve (53) is connected with a transmission member.

9. The head fixation device for ophthalmic examination according to claim 8, wherein: The inner side of the head support frame (1) is provided with a soft pad at the top.

10. The head fixation device for ophthalmic examination according to claim 9, wherein: The side wall of the sliding sleeve rod (41) is provided with a sliding plane.

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