Auxiliary device for injection in vitreous cavity

Abstract

The invention discloses an intravitreal injection auxiliary device which comprises a head cover, a first connecting plate connected with the head cover, a second connecting plate, a first adjusting mechanism arranged on one side of each connecting plate and a second adjusting mechanism arranged on the other side of the first connecting plate. The first adjusting mechanism comprises limiting blocks which are adjustably connected to the connecting plates and abut against the lower jaw for limiting so that the head cover and the connecting plates can be fixed to the head. The second adjusting mechanism comprises a guide rail movably connected with the first connecting plate and an injection block adjustably arranged on the guide rail, and an injection needle is placed on the injection block so that the injection position can be rapidly positioned and injection can be carried out. The first adjusting mechanism is arranged to limit and fix the head cover and the connecting plate on the head through the fixing of the limiting block; and the second adjusting mechanism is combined with the guide rail, so that the position of the injection block is conveniently adjusted, the injection efficiency is improved through quick positioning, and eye bleeding is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an intravitreal injection auxiliary device. Background Art

[0002] At present, for the treatment of macular edema, high myopia and retinal vascular diseases, a preparatory operation for intravitreal injection of medicine is required before the operation. Although the wound at the injection site is small, especially for patients with diabetic fundus diseases, more attention should be paid to reducing bleeding during the operation. Currently, the injection operation is mostly performed by the surgeon holding the injection needle in his hand, which requires extremely high stability of the hand operation and the stability of the surgical effect is not high. Summary of the invention

[0003] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide an intravitreal injection auxiliary device which can accurately position the needle and reduce the operation period, thereby reducing surgical bleeding.

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a vitreous cavity injection assisting device, including a head cover, a first connecting plate connected to the head cover, a second connecting plate, a first adjusting mechanism arranged on one side of each of the connecting plates, and a second adjusting mechanism arranged on the other side of the first connecting plate, the first adjusting mechanism including a limit block adjustably connected to each connecting plate and abutting against the lower jaw to limit the position so as to fix the head cover and the connecting plate to the head; the second adjusting mechanism includes a guide rail movably connected to the first connecting plate and an injection block adjustably arranged on the guide rail, and an injection needle is placed on the injection block to quickly locate the injection position and implement the injection.

[0005] By adopting the above structure, a head cover is set as a reference position connected and fixed to the head, and then two connecting plates and a first adjustment mechanism are set, and the head cover and the connecting plates are fixed to the head by the limit block; the second adjustment mechanism is set in combination with the guide rail to facilitate the adjustment of the position of the injection block, and quickly position it to improve the injection efficiency.

[0006] In order to facilitate operation and simplify the structure, preferably, the first adjustment mechanism also includes a support plate connected to the limit block and a placement groove arranged at the position of each connecting plate corresponding to the support plate, and the support plate at the corresponding end extends into the placement groove; a first threaded hole is connected at the position corresponding to the placement groove on each connecting plate, and a first locking bolt is threaded in the first threaded hole, and the first locking bolt extends into the placement groove to abut against the support plate and fix the support plate to limit the position.

[0007] In order to avoid discomfort to the patient, preferably, the limit block and the support plate are arranged perpendicular to each other, and the inner side wall of the limit block is a concave arc structure.

[0008] In order to facilitate the installation of the guide rail and avoid interference, it is preferred that a guide groove is provided on the first connecting plate, a slider is provided in the guide groove, a guide plate is connected to the slider and the first connecting plate is passed through the bottom of the guide groove, and a connecting rod is hingedly provided at the protruding end of the guide plate, the connecting rod is connected to one side of the guide rail, and the other side of the guide rail is detachably connected to the second connecting plate.

[0009] To facilitate positioning, preferably, a clearance groove is provided on the first connecting plate at a position corresponding to the guide plate, the guide plate passes through the clearance groove, and a second threaded hole is provided on the first connecting plate at a position corresponding to the clearance groove, a second locking bolt is threaded in the second threaded hole, and the second locking bolt extends into the clearance groove, abuts against the guide plate and fixes the slider to limit the position.

[0010] To facilitate disassembly and assembly, preferably, a limit pin is longitudinally inserted on the other side of the guide rail, and an elastic sleeve with an upward opening is provided at the position corresponding to the limit pin on the second connecting plate, and the limit pin is inserted into the elastic sleeve to fix the guide rail at a position between the first connecting plate and the second connecting plate.

[0011] In order to facilitate the injection operation at multiple positions, preferably, a through hole is provided at a position corresponding to the guide rail on the injection block, and the guide rail is provided with the through hole so that the injection block can be slidably mounted on the guide rail. A third threaded hole is connected at a position corresponding to the through hole on one side of the injection block, and a third locking bolt is threaded in the third threaded hole. The third locking bolt extends into the through hole, abuts against the guide rail and fixes the injection block to limit the position; two through holes are symmetrically provided on the injection block, a guide light is provided at a position between the two through holes on the lower end surface of the injection block, a connecting pin is provided on the upper end surface of the injection block, a marking line is provided on one side of the needle placement block, and a needle placement assembly is provided at a position corresponding to the through hole on the other side of the needle placement block.

[0012] In order to facilitate positioning, it is preferred that a mounting hole is provided at a position corresponding to the connecting pin on the needle placement block, and the mounting hole is sleeved on the outside of the connecting pin so that the needle placement block can be rotatably sleeved on the injection block; a positioning hole is provided on the injection block, and a connecting hole is provided at a position corresponding to the positioning hole on the needle placement block, a positioning pin is inserted into the connecting hole, and the insertion end of the positioning pin extends into the positioning hole, so that the needle placement block and the injection block are positioned and connected.

[0013] In order to avoid interference during use and ensure the accuracy of the injection needle depth, preferably, the needle placement assembly includes placement holes arranged at positions corresponding to the two through holes on the needle placement block and at least one needle placement sleeve arranged in each placement hole, and the lower end of each needle placement sleeve is provided with a baffle connected by an elastic band and fit with the lower end surface of the needle placement sleeve, and a clearance hole for the needle tip to pass through is provided on one side of the baffle; a limit plate is provided at a position corresponding to the baffle in the through hole on one side. When in use, the syringe is pushed to synchronously drive the baffle to move downward and abut against the limit plate to limit the position, so as to control the depth of the injection.

[0014] In order to better ensure the stability and accuracy of needle insertion, preferably, a guide sleeve for the needle tip to pass through is provided at the position corresponding to the needle sleeve in the through hole on one side, and the distance between the center of each guide sleeve and the projection direction of the marking position determines the needle insertion position to ensure the stability of the needle insertion position.

[0015] Beneficial effects: The present invention provides a first adjustment mechanism to fix the head cover and the connecting plate of the limit block on the head; the second adjustment mechanism is combined with the guide rail to facilitate the adjustment of the position of the injection block, and quickly position it to improve the injection efficiency and thereby reduce eye bleeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 for Figure 1 Enlarged view of point A in .

[0019] Figure 3 Schematic diagram of the installation structure of the guide sleeve.

[0020] Figure 4 for Figure 1 Bottom view of .

[0021] Figure 5 yes Figure 4 Enlarged view of point B in .

[0022] The meanings of the symbols in the accompanying drawings are:

[0023] Head cover-1; guide groove-10; first connecting plate-101; second connecting plate-102; clearance groove-103; slider-11; guide plate-12; connecting rod-13; guide rail-14; second threaded hole-15; second locking bolt-16; limit pin-17; elastic sleeve-18;

[0024] Support plate-2; limit block-20; placement slot-21; first threaded hole-22; first locking bolt-23;

[0025] Guide light-3; injection block-30; through hole-301; connecting pin-31; needle placement block-32; positioning hole-33; connecting hole-34; positioning pin-35; mounting hole-36; third threaded hole-37; third locking bolt-38; placement hole-39;

[0026] Needle placement sleeve-4; elastic band-41; baffle-42; clearance hole-421; limit plate-43; guide sleeve-44; marking line-5. DETAILED DESCRIPTION

[0027] Depend on Figures 1 to 5 As shown, the present invention includes a head cover 1, a first connecting plate 101 connected to the head cover 1, a second connecting plate 102, a first adjusting mechanism arranged on one side of each connecting plate, and a second adjusting mechanism arranged on the other side of the first connecting plate 101, the first adjusting mechanism includes a limit block 20 which is adjustably connected to each connecting plate and abuts against the lower jaw to limit the position so as to fix the head cover 1 and the connecting plate on the head; the second adjusting mechanism includes a guide rail 14 movably connected to the first connecting plate 101 and an injection block 30 adjustably arranged on the guide rail 14, and an injection needle is placed on the injection block 30 to quickly locate the injection position and implement the injection.

[0028] Specifically, the first adjustment mechanism also includes a support plate 2 connected to the limit block 20 and a placement groove 21 provided at a position on each connecting plate corresponding to the support plate 2, and the support plate 2 at the corresponding end extends into the placement groove 21; a first threaded hole 22 is connected at a position on each connecting plate corresponding to the placement groove 21, and a first locking bolt 23 is threadedly connected in the first threaded hole 22, and the first locking bolt 23 extends into the placement groove 21 and abuts against the support plate 2 to fix the support plate 2 to limit the position; the limit block 20 and the support plate 2 are arranged perpendicular to each other, and the inner side wall of the limit block 20 is a concave arc structure.

[0029] A guide groove 10 is provided on the first connecting plate 101, a slider 11 is provided in the guide groove 10, a guide plate 12 is connected to the slider 11, and the guide plate 12 passes through the bottom of the guide groove 10 to extend the first connecting plate 101. A connecting rod 13 is hingedly provided at the extending end of the guide plate 12, and the connecting rod 13 is connected to one side of a guide rail 14, and the other side of the guide rail 14 is connected to the second connecting plate 102; a limit pin 17 is longitudinally inserted on the other side of the guide rail 14, and an elastic sleeve 18 with an upward opening is provided at the position of the second connecting plate 102 corresponding to the limit pin 17, and the limit pin 17 is inserted into the elastic sleeve 18, so that the guide rail 14 is fixedly connected to the position between the first connecting plate 101 and the second connecting plate 102.

[0030] A clearance groove 103 is provided at a position on the first connecting plate 101 corresponding to the guide plate 12, and the guide plate 12 passes through the clearance groove 103. A second threaded hole 15 is provided at a position on the first connecting plate 101 corresponding to the clearance groove 103, and a second locking bolt 16 is threaded in the second threaded hole 15. The second locking bolt 16 extends into the clearance groove 103, abuts against the guide plate 12, and fixes the slider 11 to limit the position.

[0031] A through hole is provided on the injection block 30 at a position corresponding to the guide rail 14, and the guide rail 14 is provided with the through hole so that the injection block 30 can be slidably sleeved on the guide rail 14. A third threaded hole 37 is connected at a position corresponding to the through hole on one side of the injection block 30, and a third locking bolt 38 is threadedly connected in the third threaded hole 37. The third locking bolt 38 extends into the through hole to abut against the guide rail 14 and fix the injection block 30 to limit the position; two through holes 301 are symmetrically provided on the injection block 30, and a guide light 3 is provided at a position between the two through holes 301 at the lower end surface of the injection block 30, and a connecting pin 31 is provided on the upper end surface of the injection block 30, and a needle placement block 32 is detachably provided on the connecting pin 31, and a marking line 5 is provided on one side of the needle placement block 32, and a needle placement assembly is provided at a position corresponding to the through hole 301 on the other side of the needle placement block 32.

[0032] The needle placement assembly includes placement holes 39 arranged at positions corresponding to two through holes 301 on the needle placement block 32 and at least one needle placement sleeve 4 arranged in each placement hole 39, and the lower end of each of the needle placement sleeves 4 is provided with a baffle 42 connected by an elastic band 41 and fitted with the lower end surface of the needle placement sleeve 4, and a clearance hole 421 for the needle tip to pass through is provided on one side of the baffle 42; a limit plate 43 is provided at a position corresponding to the baffle 42 in the through hole 301 on one side, and when in use, the syringe is pushed to synchronously drive the baffle 42 to move downward and abut against the limit plate 43 to limit the position, so as to control the depth of the needle; a guide sleeve 44 is provided at a position corresponding to the needle placement sleeve 4 in the through hole 301 on one side, and the needle tip is passed through, and the distance between the center of each guide sleeve 44 and the projection direction of the mark line 5 position determines the needle position to ensure the stability of the needle position.

[0033] A mounting hole 36 is provided on the needle placement block 32 at a position corresponding to the connecting pin 31, and the mounting hole 36 is sleeved on the outside of the connecting pin 31 so that the needle placement block 32 can be rotatably sleeved on the injection block 30; a positioning hole 33 is provided on the injection block 30, and a connecting hole 34 is provided on the needle placement block 32 at a position corresponding to the positioning hole 33, and a positioning pin 35 is inserted into the connecting hole 34, and the insertion end of the positioning pin 35 extends into the positioning hole 33, so that the needle placement block 32 is positioned and connected with the injection block 30.

[0034] The use principle of the present invention is as follows:

[0035] like Figure 1 As shown, two guide rails 14 are provided and are arranged parallel to each other, and a limiting pin 17 is provided on each guide rail 14 to achieve stability of connection and fixation.

[0036] When in use, the head cover 1 is first placed on the front end of the patient's brain, and the first connecting plate 101 and the second connecting plate 102 are naturally located on the left and right sides of the patient's head. In order to avoid the patient's mouth movement during the operation that affects the accuracy of the needle insertion, and to ensure the installation stability of the guide rail 14 used, the patient is required to close his lower jaw and close his lips at this time; then, the support plate 2 is moved axially along the placement groove 21, and the inner wall of the limit block 20 is made close to the patient's lower jaw, and then, the first locking bolt 23 is riveted, and the first locking bolt 23 is extended into the placement groove 21 to abut against the support plate 2 and fix the support plate 2 to limit the position. In this way, under the limiting action of the head cover 1 and the limit block 20, the two connecting plates are installed and positioned; wherein, since the inner wall of the limit block 20 is a concave arc structure, it can reduce and alleviate the patient's feeling of discomfort when using it.

[0037] Then, if Figure 1 and Figure 4 As shown, the guide rail 14 is flipped to a horizontal position, and the limit pin 17 is first inserted into the elastic sleeve 18 to fix the guide rail 14 in a position between the first connecting plate 101 and the second connecting plate 102. At this time, the injection block 30 is quickly pushed to move horizontally to above the patient's surgical eye position. After it is in place, the third locking bolt 38 is first inserted into the through hole to abut against the guide rail 14 and fix the injection block 30 to limit the position; then, the limit pin 17 is removed from the elastic sleeve 18. At this time, the slider 11 is pushed to synchronously drive the guide rail 14 hinged thereto to move along the axial direction of the connecting plate, that is, move along the longitudinal direction of the guide rail 14, so that the injection block 30 is located directly above the patient's surgical eye position. After moving into place, the limit pin 17 is again inserted into the elastic sleeve 18 to fix the limit guide rail 14.

[0038] like Figures 2 to 5 As shown, since the vitreous injection position is mostly 3 to 4 mm behind the limbus of the cornea and sclera, when setting the needle sleeve 4, three positions with distances of 3 mm, 3.5 mm and 4 mm are selected as examples. Specifically, the needle sleeves 4 with distances of 3 mm and 4 mm are set in the placement hole 39 on the left, and the needle sleeve 4 with a distance of 3.5 mm is set in the placement hole 39 on the right. In this way, it is convenient to set the needle sleeves 4 at intervals to avoid processing interference; correspondingly, guide sleeves 44 corresponding to the three distance positions are set in the left through hole 301 of the injection block 30. On the one hand, installation interference of the needle sleeve 4 is avoided, and on the other hand, the needle sleeve 4 with a corresponding distance can be adapted to the needle sleeve 4 by rotating the needle block 32 according to the needs of the needle insertion position.

[0039] At the same time, a limit plate 43 is provided at the position corresponding to the through hole 301 between the needle sleeve 4 and the guide sleeve 44 at the corresponding position, so as to effectively control the depth of the needle insertion. Specifically, according to the eye protrusion error of a normal person (about 1 mm) and the injection needle insertion depth (4-6 mm), the spacing between the upper end surface of the limit plate 43 and the lower end surface of the baffle 42 is set to 5 mm; at the same time, the elasticity requirement of the rubber band 41 is that the upper end surface of the baffle 42 is still kept in contact with the lower end surface of the needle sleeve 4 when the injection needle is inserted, so as to reduce the overlap of the use error; since the injection needle used is small and the amount of medicine is small, the gravity generated should be able to be overcome by the elastic force of the rubber band 41, that is, when a syringe filled with liquid medicine is placed in the needle sleeve 4 without applying external force, the baffle 42 will not be displaced, so as to ensure the safe application range of the needle insertion depth.

[0040] On the basis of this setting, taking the left placement hole 39 as an example, then, turn on the guide light 3, and let the patient's eyes look towards the guide light, that is, turn the eyeball over and expose the position of the corneoscleral limbus (commonly known as the white of the eye on the side of the eyeball). At this time, according to the position where the injection is to be implemented (3mm or 4mm), put the syringe in the corresponding needle sleeve 4, and make the needle tip pass through the clearance hole 421, and the needle tip passes through the guide sleeve 44 at the corresponding position to complete the preparation before the operation. At this time, the needle tip position and the eyeball position are about 1mm (the specific setting is based on the smaller exophthalmos value). In this way, plus the reserved spacing of 5mm between the limit plate 43 and the baffle 42, when the limit plate 43 and the baffle 42 are abutted against the limit, the insertion depth of the needle tip is about 4mm, which is the minimum value required for the operation. Combined with the 1mm error of the exophthalmos, for patients with large exophthalmos values, the needle insertion depth can also be achieved at about 5mm, not exceeding 6mm, fully ensuring the accuracy and stability of the needle insertion depth.

[0041] If a distance of 3.5 mm is to be used, first remove the positioning pin 35, rotate the needle placement block 32 on the injection block 30 with the connecting pin 31 as the center, and move the placement hole 39 on the right side to be directly above the through hole 301 on the left side (the left and right directions involved in the text are based on the directions shown in the figure), and then insert the positioning pin 35 into the connecting hole 34 and the positioning hole 33 in turn to achieve re-positioning and connection of the needle placement block 32 and the injection block 30, and then operate in real time according to the aforementioned related steps.

[0042] Since the terminal ends of the three distance dimensions are not in a straight line nor are they concentrically arranged, as long as they can be implemented within the range of the eyeball, the external dimensions can be reasonably designed during installation to avoid interference; the guide sleeve 44 with a distance of 3.5 mm can also be separately set in the position of the through hole 301 on the right and used, and correspondingly, the second marking line 5 should also be adapted and arranged. In this way, there is no need to rotate the needle placement block 32, and the injection block 30 can continue to be moved and adjusted on the guide rail 14, which is flexible in setting and use.

[0043] During the entire use process, since the only movable mandible in the head is fixed and the eyes are anesthetized during the operation, as long as the patient keeps looking at the light in a fixed direction, it will not cause discomfort to the patient. The installation of the two connecting plates is also stable. On this basis, combined with the small amount of medicine, the operation time is not long, and the needle position has been preset, it can greatly reduce surgical bleeding, which is especially beneficial for diabetic patients.

[0044] It should be pointed out that for the setting of the needle length distance of 3-4mm, it is also necessary to set a marking line 5 on the needle placement block 32. When the patient turns his eyes to look at the guide light 3, loosen the second locking bolt 16, fine-tune and move the injection block 30, and drive the needle placement block 32 to move synchronously, and align the marking line 5 with the edge of the corneal scleral margin of the patient's rotated eyeball (commonly known as the edge of the black eyeball) in the projection direction, and then tighten the second locking bolt 1 to fix the injection block 30 on the guide rail 14; therefore, the needle length distance, that is, the straight-line distance between the center of the guide sleeve 44 and the position of the marking line 5 in the projection direction, fully guarantees the accuracy of the needle position.

[0045] The above adjustment has little effect on the displacement of the guide light 3. Considering that the turning angle has a limit position, the position of the guide light 3 can be reasonably set accordingly.

[0046] After use, take out the syringe, remove the limit pin 17 from the elastic sleeve 18, loosen the first locking bolt 23, loosen the limit block 20, pull the support plate 2, and directly remove the head cover 1; in this regard, since the limit pin 17 is longitudinally inserted on the guide rail 14, it plays a limiting role in the axial direction of the guide rail 14, even if the second locking bolt 16 is loosened, the injection block 30 will not fall off the guide rail 14.

[0047] Other surgical contents involved in this embodiment (such as disinfection and anesthesia treatment) are consistent with the prior art and will not be repeated here.

Claims

1. An intravitreal injection assisting device, characterized in that: The invention comprises a head cover (1), a first connecting plate (101) connected to the head cover (1), a second connecting plate (102), a first adjusting mechanism arranged on one side of each connecting plate, and a second adjusting mechanism arranged on the other side of the first connecting plate (101), wherein the first adjusting mechanism comprises a limit block (20) which is adjustably connected to each connecting plate and abuts against the lower jaw to limit the position so as to fix the head cover (1) and the connecting plate on the head; and the second adjusting mechanism comprises a guide rail (14) movably connected to the first connecting plate (101) and an injection block (30) adjustably arranged on the guide rail (14), and an injection needle is placed on the injection block (30) so as to quickly locate the injection position and implement the injection.

2. The intravitreal injection assisting device according to claim 1, characterized in that: The first adjustment mechanism further comprises a support plate (2) connected to the limit block (20) and a placement groove (21) provided at a position on each connecting plate corresponding to the support plate (2), the support plate (2) at the corresponding end extending into the placement groove (21); a first threaded hole (22) is provided at a position on each connecting plate corresponding to the placement groove (21), a first locking bolt (23) is threadedly connected in the first threaded hole (22), and the first locking bolt (23) extends into the placement groove (21) to abut against the support plate (2) and fix the support plate (2) to limit the position.

3. The intravitreal injection assisting device according to claim 2, characterized in that: The limit block (20) and the support plate (2) are arranged perpendicular to each other, and the inner side wall of the limit block (20) is a concave arc structure.

4. The intravitreal injection assisting device according to claim 1, characterized in that: A guide groove (10) is provided on the first connecting plate (101), a slider (11) is provided in the guide groove (10), a guide plate (12) is connected to the slider (11) and passes through the bottom of the guide groove (10) to form the first connecting plate (101), a connecting rod (13) is hingedly provided at the passing end of the guide plate (12), the connecting rod (13) is connected to one side of a guide rail (14), and the other side of the guide rail (14) is detachably connected to the second connecting plate (102).

5. The intravitreal injection assisting device according to claim 4, characterized in that: A clearance groove (103) is provided on the first connecting plate (101) at a position corresponding to the guide plate (12), the guide plate (12) passes through the clearance groove (103), a second threaded hole (15) is provided on the first connecting plate (101) at a position corresponding to the clearance groove (103), a second locking bolt (16) is threadedly connected in the second threaded hole (15), the second locking bolt (16) extends into the clearance groove (103) to abut against the guide plate (12) and fix the slider (11) to limit position.

6. The intravitreal injection assisting device according to claim 4, characterized in that: A limit pin (17) is longitudinally inserted on the other side of the guide rail (14), and an elastic sleeve (18) with an opening facing upward is provided at a position corresponding to the limit pin (17) on the second connecting plate (102), and the limit pin (17) is inserted into the elastic sleeve (18) so that the guide rail (14) is fixedly connected at a position between the first connecting plate (101) and the second connecting plate (102).

7. The intravitreal injection assisting device according to claim 4, characterized in that: A through hole is provided at a position corresponding to the guide rail (14) on the injection block (30), the guide rail (14) is provided with the through hole so that the injection block (30) is slidably sleeved on the guide rail (14), a third threaded hole (37) is provided at a position corresponding to the through hole on one side of the injection block (30), a third locking bolt (38) is threadedly connected in the third threaded hole (37), and the third locking bolt (38) extends into the through hole to abut against the guide rail (14) and fix the injection block (30) to limit position; Two through holes (301) are symmetrically arranged on the injection block (30), a guide light (3) is arranged at a position between the two through holes (301) on the lower end surface of the injection block (30), a connecting pin (31) is arranged on the upper end surface of the injection block (30), a needle placement block (32) is detachably arranged on the connecting pin (31), a marking line (5) is arranged on one side of the needle placement block (32), and a needle placement assembly is arranged at a position corresponding to the through hole (301) on the other side of the needle placement block (32).

8. The intravitreal injection assisting device according to claim 7, characterized in that: A mounting hole (36) is provided on the needle placement block (32) at a position corresponding to the connecting pin (31), and the mounting hole (36) is sleeved on the outer side of the connecting pin (31) so that the needle placement block (32) can be rotatably sleeved on the injection block (30); a positioning hole (33) is provided on the injection block (30), and a connecting hole (34) is provided on the needle placement block (32) at a position corresponding to the positioning hole (33), and a positioning pin (35) is inserted into the connecting hole (34), and the insertion end of the positioning pin (35) extends into the positioning hole (33) so that the needle placement block (32) and the injection block (30) are positioned and connected.

9. The intravitreal injection assisting device according to claim 8, characterized in that: The needle placement assembly comprises placement holes (39) arranged at positions corresponding to two through holes (301) on the needle placement block (32) and at least one needle placement sleeve (4) arranged in each placement hole (39); the lower end of each needle placement sleeve (4) is provided with a baffle (42) connected by an elastic band (41) and fitted with the lower end surface of the needle placement sleeve (4); a clearance hole (421) for the needle tip to pass through is provided on one side of the baffle (42); a limit plate (43) is provided in the through hole (301) on one side at a position corresponding to the baffle (42); when in use, the syringe is pushed to synchronously drive the baffle (42) to move downward and abut against the limit plate (43) to limit the position, so as to control the depth of the needle.

10. The intravitreal injection assisting device according to claim 9, characterized in that: A guide sleeve (44) for the needle tip to pass through is provided at a position corresponding to the needle sleeve (4) in the through hole (301) on one side, and the distance between the center of each guide sleeve (44) and the projection direction of the marking line (5) determines the needle insertion position to ensure the stability of the needle insertion position.

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