Adjustable extraocular muscle retractor for strabismus correction

Abstract

The invention discloses an adjustable extraocular muscle retractor for strabismus correction, and relates to the technical field of medical instruments.The adjustable extraocular muscle retractor comprises a shear fork frame and a shell, horizontal sliding blocks are rotationally connected to the two ends of the bottom of the shear fork frame, the outer sides of the two sliding blocks are slidably sleeved with the same fixing frame, and a driving mechanism is arranged in the shell and comprises a first inner gear ring; the sliding block is horizontally and rotatably connected to the bottom end of the inner arc wall of the shell; according to the invention, through the rotary connection design of the shear fork frame and the shell and the cooperation of the driving mechanism, a user can rotate the shear fork frame to adjust the operation angle, so that an assistant does not need to keep a fixed posture and can naturally rotate the hand to a comfortable angle, the distance between the two traction arms can be adjusted at any angle, and fatigue caused by backhand operation is avoided; the shell rotates without changing the position of the traction arm, interference of traditional hand changing operation on the visual field of a surgeon is avoided, the operation angle can be adjusted without hand changing, and the situation that an instrument mistakenly touches eyeballs is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, in particular to an adjustable extraocular muscle retractor for strabismus correction. Background Art

[0002] Strabismus correction surgery is a common ophthalmic procedure that aims to correct eye deviation (such as esotropia or exotropia) by adjusting the attachment point or muscle tension of the extraocular muscles outside the eyeball, thereby restoring binocular vision function and appearance symmetry. During the operation, the surgeon needs to expose the extraocular muscles (such as the medial rectus muscle and lateral rectus muscle), separate them from the scleral surface, and adjust the tension by suturing or folding the muscles.

[0003] The extraocular muscle retractor is a key auxiliary tool during surgery, used to retract and fix the extraocular muscles, providing doctors with a clear surgical field of view. In traditional operations, assistants need to use two retraction hooks to hook the two ends of the extraocular muscles respectively, and continuously retract with both hands to maintain muscle tension. However, it is difficult to perform hemostasis operations simultaneously during the retraction process, which prolongs the operation time. Long-term retraction with both hands can easily lead to muscle fatigue and affect the stability of retraction.

[0004] In order to solve the problem of two-handed operation, a scissor-type retractor has appeared on the market. It controls the opening and closing of the two traction ends by holding the scissor handle with one hand, and realizes one-handed adjustment of the distance. However, it was found in clinical use that: because the assistant stands on the side of the surgeon or even the opposite side, he is actually operating with his backhand when retracting the extraocular muscles. Not only is the hand easily fatigued but the operation accuracy is reduced. If the traction angle needs to be adjusted, it is still necessary to change hands or adjust the grip posture, which poses a risk of accidentally touching the eyeball, affecting the safety of the operation.

[0005] In view of this, this application is hereby filed. Summary of the Invention

[0006] The object of the present invention is to provide an adjustable extraocular muscle retractor for strabismus correction to solve the problems raised in the above background technology.

[0007] To solve the above technical problems, the present invention provides an adjustable extraocular muscle retractor for strabismus correction, comprising a scissor frame and a housing. Both ends of the bottom of the scissor frame are rotatably connected to horizontal sliders, and the outer sides of the two sliders are slidably sleeved with the same fixed frame. A driving mechanism is provided in the housing, and the driving mechanism includes:

[0008] An inner gear ring 1 is horizontally rotatably connected to the bottom end of the inner arc wall of the shell, a fixed plate 1 is fixed to the bottom of the slider, and the fixed plate 1 slides against the top of the inner gear ring 1, and a rack rod 1 is fixed to one end of the fixed plate 1 on a side wall close to the inner gear ring 1 along the width direction of the fixed plate 1, and a driving gear 1 is meshed with one side of the rack rod 1 close to the center of the fixed plate 1, and a one-way transmission mechanism is fixed to the inner wall of the bottom of the driving gear 1 along its axial direction, and a driving gear 2 is coaxially fixed to the end of the one-way transmission mechanism away from the driving gear 1, and the driving gear 2 and the inner gear ring 1 are meshed with each other, and the one-way transmission mechanism allows the driving gear 1 to drive the driving gear 2, while the driving gear 2 cannot drive the driving gear 1 to rotate in the opposite direction;

[0009] The driven gear 1 is horizontally meshed with the bottom end of the inner side of the inner gear ring 1, and the driven gear 2 is coaxially fixed to the end of the driven gear 2 which is axially away from the driving gear 2. The driven gear 2 is meshed with a horizontal rack rod 2 on one side thereof in the horizontal direction. A fixing plate 2 is fixed to a side wall of the rack rod 2 away from the driving gear 2. A vertical sliding channel 1 is provided on the inner wall of the bottom of the shell at a position corresponding to the fixing plate 2. A traction arm is fixed to the bottom of the fixing plate 2, and the traction arm slides in the sliding channel 1. Therefore, when the scissors frame drives the fixing plate 1 to move, the traction arm can also be driven to move.

[0010] Furthermore, the length directions of the fixed plate 1, the rack rod 1, the driven gear 2 and the rack rod 2 are all radially consistent with the shell body, and the shell includes a fixed ring 1 and a fixed ring 2 coaxially connected to each other, wherein the fixed ring 1 is arranged away from the traction arm compared to the fixed ring 2, the inner gear ring 1 is rotatably connected to the top end of the inner arc wall of the fixed ring 2, and the opposite sides of the inner arc wall of the fixed ring 1 are provided with sliding channels 2 penetrating along its radial direction, the fixed plate 1 and the rack rod 1 both slide in the sliding channel 2, and the opposite sides of the outer arc wall of the fixed ring 2 are provided with sliding channels 3 penetrating along its radial direction, the rack rod 2 and the fixed plate 2 both slide in the sliding channel 3, and the top end of the inner arc wall of the fixed ring 1 is provided with an annular sliding groove 1, the length direction of the fixed frame is radially consistent with the fixed ring 1, and the two ends of the fixed frame along its own length direction slide in the sliding groove 1.

[0011] Furthermore, the scissor frame includes a scissor arm 1 and a scissor arm 2 that are rotatably connected to each other, the middle parts of the scissor arm 1 and the scissor arm 2 are connected to each other by a damping shaft, the ends of the scissor arm 1 and the scissor arm 2 on the same side are rotatably connected to a fixed ear seat, the end of the fixed ear seat away from the scissor frame is fixedly connected to the slider, the end of the scissor frame away from the slider is fixed with a finger ring, and the one-way transmission mechanism arranged on a side wall where the driving gear 1 and the driving gear 2 are close to each other includes an inner gear ring 2 that is coaxially fixedly connected to a side wall of the driving gear 1 close to the driving gear 2, and an inner gear ring 3 is coaxially fixed on a side wall of the inner gear ring 2 away from the driving gear 1, and the inner gear ring 3 is rotatably abutted against the driving gear 2.

[0012] Furthermore, the driving gear one is rotatably connected to a fixed seat at the center of a side wall close to the driving gear two, the length direction of the fixed seat is consistent with the radial direction of the driving gear one, and a side wall of the fixed seat away from the driving gear one is provided with a slide groove two at both ends along the length direction of the fixed seat, and a limit block slides in the slide groove two, and an oblique slide groove is provided on the middle part of the side wall of the limit block close to the driving gear two, the oblique slide groove and the limit block are located in the same horizontal plane and the oblique slide groove passes through the limit block, and the fixed seat is coaxially fixed to the driving gear two at the center of the side wall away from the driving gear one.

[0013] Furthermore, a pawl is fixed to one end of the limit block away from the middle of the fixed seat, and ratchets are fixed on the inner arc walls of the inner gear ring 2 and the inner gear ring 3, and the ratchets on the inner arc walls of the two have opposite rotation directions, and the two pawls are symmetrically arranged about the central symmetry line in the length direction of the fixed seat, and a vertically arranged sliding column is fixed on the side wall of the driving gear 2 close to the driving gear 1 at the position corresponding to the inclined grooves on the two limit blocks, and the sliding column slides and abuts against the inner wall of the inclined groove, the cross-sectional radius of the driving gear 1 is larger than the cross-sectional radius of the driving gear 2, the cross-sectional radius of the driving gear 2 is consistent with the cross-sectional radius of the driven gear 1, and the cross-sectional radius of the driven gear 2 is smaller than the cross-sectional radius of the driven gear 1.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Through the rotating connection design between the scissor frame and the shell, combined with the drive mechanism, the user can rotate the scissor frame to adjust the operating angle. The assistant does not need to maintain a fixed posture and can naturally rotate his hands to a comfortable angle. The distance between the two traction arms can be adjusted at any angle to avoid fatigue caused by backhand operation. The rotation of the shell does not change the position of the traction arm, avoiding interference with the surgeon's field of vision caused by traditional hand-changing operations. The operating angle can be adjusted without changing hands, reducing accidental contact of the instrument with the eyeball.

[0016] 2. Through the one-way transmission mechanism, the movement of the traction arm will not be adjusted incorrectly during the rotation adjustment. Combined with the multi-stage gear transmission, the larger displacement input at one end of the scissors frame is converted into smaller displacement changes of the two traction arms, making the adjustment of the extraocular muscle tension more precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the overall structure of an adjustable extraocular muscle retractor for strabismus correction Figure 1 ;

[0018] Figure 2 A schematic diagram of the internal structure of a shell of an adjustable extraocular muscle retractor for strabismus correction;

[0019] Figure 3 This is an exploded diagram of the structure of the driving mechanism of an adjustable extraocular muscle retractor for strabismus correction;

[0020] Figure 4 This is an exploded view of the structure of a one-way transmission mechanism in an adjustable extraocular muscle retractor for strabismus correction;

[0021] Figure 5 A schematic diagram of the positional relationship between the scissor frame and the fixed frame in an adjustable extraocular muscle retractor for strabismus correction;

[0022] Figure 6 Schematic diagram of the overall structure of an adjustable extraocular muscle retractor for strabismus correction Figure 2 .

[0023] In the picture:

[0024] 10. Scissor frame; 11. Finger ring; 12. Fixed ear seat; 13. Slider; 14. Fixed frame; 15. Pulling arm;

[0025] 20. Housing; 201. Fixing ring 1; 202. Fixing ring 2; 21. Fixing plate 1;

[0026] 22. Rack rod 1; 23. Driving gear 1; 24. Driving gear 2; 25. Driven gear 1;

[0027] 26. Internal gear ring 1; 27. Driven gear 2; 28. Rack rod 2; 29. Fixed plate 2;

[0028] 30. Internal gear ring 2; 31. Internal gear ring 3; 32. Fixed seat; 33. Limit block; 34. Pawl; 35. Sliding column. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Please see the attached Figure 1 To the attached Figure 6 The present invention provides a technical solution: comprising a scissor frame 10 and a housing 20, wherein both ends of the bottom of the scissor frame 10 are rotatably connected to a horizontal slider 13, and the outer sides of the two sliders 13 are slidably sleeved with a same fixed frame 14, and a driving mechanism is provided in the housing 20, and the driving mechanism includes:

[0031] An inner gear ring 26 is horizontally rotatably connected to the bottom end of the inner arc wall of the housing 20. A fixing plate 21 is fixed to the bottom of the slider 13. The fixing plate 21 slides against the top of the inner gear ring 26. A rack rod 22 is fixed to one end of the fixing plate 21 in the width direction on one side wall of the fixing plate 21 close to the inner gear ring 26. A driving gear 23 is meshed with one side of the rack rod 22 close to the center of the fixing plate 21. A one-way transmission mechanism is fixed to the inner wall of the bottom of the driving gear 23 along its axial direction. A driving gear 24 is coaxially fixed to the end of the one-way transmission mechanism away from the driving gear 1 23. The driving gear 24 and the inner gear ring 26 are meshed with each other. The one-way transmission mechanism allows the driving gear 1 23 to drive the driving gear 24, while the driving gear 24 cannot drive the driving gear 1 23 to rotate in the opposite direction.

[0032] The driven gear 1 25 is horizontally meshed with the inner bottom end of the inner gear ring 1 26, and a driven gear 27 is coaxially fixed to the end thereof axially away from the driving gear 2 24. The driven gear 2 27 is meshed with a horizontal rack rod 28 on one side thereof in the horizontal direction. A fixing plate 29 is fixed to a side wall of the rack rod 28 away from the driving gear 2 24. A vertical sliding channel 1 is provided on the bottom inner wall of the shell 20 at a position corresponding to the fixing plate 29. A traction arm 15 is fixed to the bottom of the fixing plate 29, and the traction arm 15 slides in the sliding channel 1. Therefore, when the scissor frame 10 drives the fixing plate 1 21 to move, the traction arm 15 can also be driven to move.

[0033] It should be noted that the scissor frame 10 is a scissor structure composed of a scissor arm 1 and a scissor arm 2 overlapping at their centers and then passing through a damping shaft and then hinged together. Under normal circumstances, when a user is right-handed and uses a similar scissor structure, the thumb and index finger are respectively inserted into the finger ring 11 to control the above-mentioned scissor structure.

[0034] When the user's thumb and index finger are respectively inserted into the finger rings 11 and the two finger rings 11 are controlled to move closer to or apart from each other, the scissor arm 1 and the scissor arm 2 of the scissor frame 10 rotate relative to each other through the damping shaft, thereby driving the sliders 13 at both ends to slide along the inner side of the fixed frame 14. A fixed plate 1 21 is fixed to the bottom of the slider 13. The fixed plate 1 21 moves outward along the sliding channel 2 of the fixed ring 1 201, driving the rack rod 1 22 on its side wall to translate synchronously. As the rack rod 1 22 translates, the driving gear 1 23 rotates, thereby driving the driving gear 2 24 to rotate synchronously.

[0035] Driving gear 2 24 drives inner gear ring 1 26 to rotate, and inner gear ring 1 26 then engages driven gear 1 25 to drive driven gear 2 27 to rotate, and driven gear 2 27 engages rack rod 2 28 to drive fixed plate 2 29 to drive traction arm 15 to move radially along housing 20, adjust the spacing and thus control the tension of the pulled extraocular muscles.

[0036] Please see the attached Figure 1 To the attached Figure 6 The present invention provides a technical solution: the length directions of the fixed plate 21, the rack rod 22, the driven gear 27 and the rack rod 28 are all radially consistent with the housing 20, and the housing 20 includes a fixed ring 201 and a fixed ring 202 that are coaxially connected to each other for rotation, wherein the fixed ring 201 is arranged farther away from the traction arm 15 than the fixed ring 202, and the inner gear ring 26 is rotatably connected to the top of the inner arc wall of the fixed ring 202. The inner arc wall of the fixed ring 201 is provided with a sliding channel 2 extending radially therethrough on opposite sides thereof, and the fixed plate 21 and the rack rod 22 both slide in the sliding channel 2;

[0037] The outer arc wall of the second fixing ring 202 is provided with sliding channels 3 extending radially therethrough on opposite sides thereof. The second rack rod 28 and the second fixing plate 29 both slide in the sliding channels 3. The top of the inner arc wall of the first fixing ring 201 is provided with an annular sliding groove 1. The length direction of the fixing frame 14 is consistent with the radial direction of the first fixing ring 201. Both ends of the fixing frame 14 along its own length direction slide in the sliding groove 1.

[0038] The scissor frame 10 includes a scissor arm 1 and a scissor arm 2 that are rotatably connected to each other. The middle parts of the scissor arm 1 and the scissor arm 2 are connected to each other through a damping shaft. The ends of the scissor arm 1 and the scissor arm 2 on the same side are rotatably connected to a fixed ear seat 12. The end of the fixed ear seat 12 away from the scissor frame 10 is fixedly connected to a slider 13, and the end of the scissor frame 10 away from the slider 13 is fixed with a finger ring 11.

[0039] It should be noted that if the user controls the scissor frame 10 to rotate axially along the housing 20, that is, drives the fixed plate 1 21 and the rack rod 1 22 to rotate circumferentially along the fixed ring 1 201, at this time, due to the large friction resistance between the inner gear ring 1 26 and the inner arc wall of the fixed ring 2 202, the driving gear 2 24 will be reversely engaged. However, the one-way transmission mechanism ensures that the rotation of the driving gear 2 24 will not drive the rotation of the driving gear 1 23, and thus will not reversely change the state of the scissor frame 10.

[0040] Sliding channel 2 and sliding channel 3 are both used to accommodate the extension of fixed plate 1 21, rack rod 1 22, rack rod 28, and fixed plate 2 29. The bottom of fixed ring 202 is closed. The inner wall of the bottom of fixed ring 202 is provided with sliding channel 1 that vertically penetrates and extends radially thereof. The traction arm 15 slides in sliding channel 1.

[0041] The fixed frame 14 is used to provide guidance and track restriction for the sliding of the slider 13 , and the housing 20 provides support for the sliding of the fixed frame 14 .

[0042] Please see the attached Figure 1 To the attached Figure 6The present invention provides a technical solution: a one-way transmission mechanism provided on a side wall of the driving gear 1 23 and the driving gear 2 24 near each other includes an inner gear ring 2 30 coaxially fixedly connected to a side wall of the driving gear 1 23 near the driving gear 2 24, and an inner gear ring 3 31 coaxially fixed to a side wall of the inner gear ring 2 30 away from the driving gear 1 23, and the inner gear ring 3 31 is in rotational contact with the driving gear 2 24;

[0043] The driving gear 1 23 is rotatably connected to a fixed seat 32 at the center of a side wall close to the driving gear 2 24. The length direction of the fixed seat 32 is consistent with the radial direction of the driving gear 1 23. A sliding groove 2 is provided at both ends of the side wall of the fixed seat 32 away from the driving gear 1 23 along the length direction of the fixed seat 32. A limit block 33 slides in the sliding groove 2. An oblique sliding groove is provided in the middle of the side wall of the limit block 33 close to the driving gear 2 24. The oblique sliding groove and the limit block 33 are located in the same horizontal plane and the oblique sliding groove passes through the limit block 33. The fixed seat 32 is coaxially fixed to the driving gear 2 24 at the center of the side wall away from the driving gear 1 23.

[0044] A pawl 34 is fixed to one end of the limit block 33 away from the middle of the fixed seat 32. Ratchets are fixed on the inner arc walls of the inner gear ring 2 30 and the inner gear ring 31, and the ratchet teeth on the inner arc walls of the two are rotated in opposite directions. The two pawls 34 are symmetrically arranged about the central symmetry line in the longitudinal direction of the fixed seat 32. On the side wall of the driving gear 2 24 close to the driving gear 1 23, vertically arranged sliding posts 35 are fixed at the positions corresponding to the inclined grooves on the two limit blocks 33, respectively. The sliding posts 35 slide and abut against the inner walls of the inclined grooves.

[0045] The cross-sectional radius of the driving gear 1 23 is larger than that of the driving gear 2 24 . The cross-sectional radius of the driving gear 2 24 is consistent with that of the driven gear 1 25 . The cross-sectional radius of the driven gear 2 27 is smaller than that of the driven gear 1 25 .

[0046] It should be noted that the inclined slot is provided through the limit block 33, and the slide post 35 slides against the inner wall of the inclined slot. When the driving gear 1 23 is actively used as the power input, regardless of whether the driving gear 1 23 is rotated clockwise or counterclockwise, the pawl 34 will inevitably interfere with the corresponding inner gear ring 2 30 or inner gear ring 31, thereby driving the fixed seat 32 and the components therein to rotate.

[0047] For example, when the driving gear 1 23 rotates in one direction, one of the ratchet pawls 34 will not block the inner gear ring 2 30, but will block the inner gear ring 3 31. However, if the user controls the scissor frame 10 to rotate along the axial direction of the housing 20, that is, drives the fixed plate 1 21 and the rack rod 1 22 to rotate circumferentially along the fixed ring 1 201, the fixed ring 1 201 will be driven by the fixed plate 1 21 and the rack rod 1 22 to rotate synchronously. At this time, the driving gear 2 24 is driven by the inner gear ring 1 26 to engage, that is, the input end becomes the driving gear 2 24.

[0048] Since the rotation of the second driving gear 24 synchronously drives the slide post 35 to rotate about the axis, the slide post 35 will abut against the inner side wall of the inclined groove on the limit block 33, thereby forcing the limit block 33 on this side to slide toward the center of the fixed seat 32. At this time, the pawl 34 at the end of the limit block 33 on this side will not engage with the inner gear ring 31 to cause any obstruction. Furthermore, since the fixed seat 32 and the first driving gear 23 are rotationally connected to each other, the first driving gear 23 will not be driven in the opposite direction at this time.

[0049] Furthermore, a return spring is fixed on one side wall of the two limit blocks 33 that are close to each other. The return spring is fixed on the inner wall of the second slide groove and is used to drive the limit blocks 33 to return to their original position.

[0050] Working principle:

[0051] The user controls the extension and retraction of the scissor frame 10 through the finger ring 11, and the scissor arm 1 and the scissor arm 2 rotate around the damping shaft, driving the sliders 13 at both ends to slide along the fixed frame 14, and the fixed plate 1 21 at the bottom of the slider 13 translates along the sliding channel 2 of the fixed ring 1 201, driving the rack rod 1 22 to engage the driving gear 1 23 to rotate, and the driving gear 1 23 drives the driving gear 2 24 through the one-way transmission mechanism. The driving gear 2 24 engages the inner gear ring 1 26, driving the driven gear 1 25 and the coaxial driven gear 2 27 to rotate, and the driven gear 2 27 engages the rack rod 2 28, pushing the fixed plate 2 29 to translate along the sliding channel 3 of the fixed ring 2 202, and finally driving the traction arm 15 to move radially along the sliding channel 1 to adjust the tension of the extraocular muscles. The fixed ring 1 201 and the fixed ring 2 202 of the shell 20 can rotate relative to each other to adjust the operating angle, and the one-way transmission mechanism ensures that the scissor frame 10 is locked during rotation.

Claims

1. A strabismus correction adjustable extraocular muscle retractor, comprising a scissor frame (10) and a housing (20), wherein both ends of the bottom of the scissor frame (10) are rotatably connected to a horizontal slider (13), and the outer sides of the two sliders (13) are slidably sleeved with a same fixed frame (14), characterized in that: A driving mechanism is provided in the housing (20), and the driving mechanism comprises: An inner gear ring (26) is horizontally rotatably connected to the bottom end of the inner arc wall of the housing (20). A fixed plate (21) is fixed to the bottom of the slider (13). The fixed plate (21) slides against the top of the inner gear ring (26). A rack rod (22) is fixed on one end of the fixed plate (21) along the width direction of the fixed plate (21) on a side wall of the fixed plate (21) close to the inner gear ring (26). A driving gear (23) is meshed on one side of the rack rod (22) close to the center of the fixed plate (21). A one-way transmission mechanism is fixed on the inner wall of the bottom of the driving gear (23) along its axial direction. A driving gear (24) is coaxially fixed on the end of the one-way transmission mechanism away from the driving gear (23). The driving gear (24) and the inner gear ring (26) are meshed with each other. The one-way transmission mechanism allows the driving gear (23) to drive the driving gear (24) while the driving gear (24) cannot drive the driving gear (23) to rotate in the opposite direction. The driven gear 1 (25) is horizontally meshed with the bottom end of the inner gear ring 1 (26), and is coaxially fixed with the driven gear 2 (27) at one end thereof axially away from the driving gear 2 (24). The driven gear 2 (27) is meshed with a horizontal rack rod 2 (28) on one side thereof in the horizontal direction. A fixing plate 2 (29) is fixed on a side wall of the rack rod 2 (28) away from the driving gear 2 (24). A vertically penetrating sliding channel 1 is provided on the inner wall of the bottom of the housing (20) at a position corresponding to the fixing plate 2 (29). A traction arm (15) is fixed at the bottom of the fixing plate 2 (29). The traction arm (15) slides in the sliding channel 1. Therefore, when the scissor frame (10) drives the fixing plate 1 (21) to move, it can drive the traction arm (15) to move.

2. The adjustable extraocular muscle retractor for strabismus correction according to claim 1, characterized in that: The length directions of the fixed plate 1 (21), the rack rod 1 (22), the driven gear 2 (27) and the rack rod 2 (28) are all radially consistent with the housing (20). The housing (20) includes a fixed ring 1 (201) and a fixed ring 2 (202) that are coaxially connected to each other for rotation, wherein the fixed ring 1 (201) is arranged farther away from the traction arm (15) than the fixed ring 2 (202), and the inner gear ring 1 (26) is rotatably connected to the top of the inner arc wall of the fixed ring 2 (202). The inner arc wall of the fixed ring 1 (201) is provided with a sliding channel 2 that penetrates along its radial direction on both opposite sides, and the fixed plate 1 (21) and the rack rod 1 (22) both slide in the sliding channel 2.

3. The adjustable extraocular muscle retractor for strabismus correction according to claim 2, characterized in that: The two opposite sides of the outer arc wall of the fixing ring 2 (202) are provided with sliding channels 3 running through the fixing ring 2 (202) along its radial direction. The rack rod 2 (28) and the fixing plate 2 (29) both slide in the sliding channel 3. The top of the inner arc wall of the fixing ring 1 (201) is provided with an annular sliding groove 1. The length direction of the fixing frame (14) is consistent with the radial direction of the fixing ring 1 (201). Both ends of the fixing frame (14) along its own length direction slide in the sliding groove 1.

4. The adjustable extraocular muscle retractor for strabismus correction according to claim 1, characterized in that: The scissor frame (10) comprises a scissor arm 1 and a scissor arm 2 which are rotatably connected to each other. The middle parts of the scissor arm 1 and the scissor arm 2 are connected to each other via a damping shaft. The ends of the scissor arm 1 and the scissor arm 2 on the same side are both rotatably connected to a fixed ear seat (12). One end of the fixed ear seat (12) away from the scissor frame (10) is fixedly connected to a slider (13). The end of the scissor frame (10) away from the slider (13) is fixed to a finger ring (11).

5. The adjustable extraocular muscle retractor for strabismus correction according to claim 1, characterized in that: The one-way transmission mechanism provided on a side wall where the driving gear 1 (23) and the driving gear 2 (24) are close to each other comprises an inner gear ring 2 (30) coaxially fixedly connected to a side wall of the driving gear 1 (23) close to the driving gear 2 (24), an inner gear ring 3 (31) coaxially fixed to a side wall of the inner gear ring 2 (30) away from the driving gear 1 (23), and the inner gear ring 3 (31) is in rotational contact with the driving gear 2 (24).

6. The adjustable extraocular muscle retractor for strabismus correction according to claim 5, characterized in that: The driving gear 1 (23) is rotatably connected to a fixed seat (32) at the center of a side wall close to the driving gear 2 (24). The length direction of the fixed seat (32) is consistent with the radial direction of the driving gear 1 (23). The fixed seat (32) is provided with a second slide groove at both ends of the side wall away from the driving gear 1 (23) along the length direction of the fixed seat (32). A limit block (33) is slidably provided in the second slide groove. The limit block (33) is provided with an inclined slide groove at the middle part of the side wall close to the driving gear 2 (24). The inclined slide groove and the limit block (33) are located in the same horizontal plane and the inclined slide groove passes through the limit block (33). The fixed seat (32) is coaxially fixed to the driving gear 2 (24) at the center of the side wall away from the driving gear 1 (23).

7. The adjustable extraocular muscle retractor for strabismus correction according to claim 6, characterized in that: A ratchet (34) is fixed to one end of the limit block (33) away from the middle of the fixed seat (32), ratchets are fixed on the inner arc walls of the inner gear ring 2 (30) and the inner gear ring 3 (31), and the ratchets on the inner arc walls of the two are rotated in opposite directions. The two ratchets (34) are symmetrically arranged about the central symmetry line of the length direction of the fixed seat (32), and a vertically arranged sliding column (35) is fixed on a side wall of the driving gear 2 (24) close to the driving gear 1 (23) at the position corresponding to the inclined slots on the two limit blocks (33), and the sliding column (35) is in sliding contact with the inner wall of the inclined slot.

8. The adjustable extraocular muscle retractor for strabismus correction according to claim 1, characterized in that: The cross-sectional radius of the driving gear 1 (23) is greater than the cross-sectional radius of the driving gear 2 (24), the cross-sectional radius of the driving gear 2 (24) is consistent with the cross-sectional radius of the driven gear 1 (25), and the cross-sectional radius of the driven gear 2 (27) is smaller than the cross-sectional radius of the driven gear 1 (25).

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