An intraocular lens injector with adjustable pushing amplitude

Abstract

The present invention relates to the technical field of intraocular lens injectors, and specifically to an intraocular lens injector with adjustable pushing amplitude, which includes an injector body. A cavity is provided inside the injector body, and an injector crystal loading part and an injector connection part are respectively arranged at both ends of the injector body. An advancing amplitude adjusting mechanism is adopted to adjust the advancing amplitude of the piston rod, accurately control the advancing stroke of the piston rod. Through the structural optimization of the piston rod, the central pull rod is accommodated, and in cooperation with the setting of the inclined groove rack, self-locking during the advancing process of the piston rod and the pushing rod is ensured, effectively preventing the accidental retraction of the intraocular lens and the extrusion of the lens caused by mis-pushing; thus, while meeting the precise implantation of the intraocular lens, it not only improves the accuracy and safety of the surgery, but also may reduce the pain of the patient and the operation time, making the surgery safer and more effective.

Description

Technical Field

[0001] The invention relates to the technical field of intraocular lens injectors, in particular to an intraocular lens injector with adjustable advancement amplitude. Background Art

[0002] Intraocular lens implantation is an effective method for treating eye diseases such as cataracts. During the operation, the doctor needs to accurately implant the intraocular lens into the patient's eye. The traditional injector needs to first inject viscoelastic at the tube mouth of the folding clamp until the viscoelastic flows back into the loading chamber, and then inject the viscoelastic into the loading chamber, place the intraocular lens, and finally press the foldable intraocular lens symmetrically into the guide groove of the folding clamp, close the folding clamp, and then insert the folding clamp into the front end of the injector, insert the shark fin of the folding clamp into the notched long end of the injector, and make sure that the folding clamp is pushed to the bottom, push the push rod repeatedly 1-2 times to ensure that the lens support loop is not stuck, and after the pusher pushes out the lens, the intraocular lens automatically rebounds and unfolds.

[0003] In the prior art, such as an injection device with publication number CN211243909U, a baffle plate is provided at the upper end of the injection cavity, a screw hole penetrating the baffle plate and the plug-in block is provided on the upper surface of the baffle plate, a guide rod is provided at the upper end of the injection rod, a screw rod is provided at the upper end of the guide rod, a baffle plate is provided at the upper end of the screw, and a knob head is provided at the upper end of the baffle plate. The injection rod is connected to the screw hole on the plug-in block in the injection cavity through the screw rod at the upper end; the injection operation of the artificial lens is realized by the screw-type threaded injection method, which effectively avoids the situation where the artificial lens injection is unstable due to uneven force in the traditional pressing and injection process.

[0004] Although the above document adopts a screw thread push method to solve the problem of the instability of traditional intraocular lens push;

[0005] However, in actual use, if the doctor or the nursing staff releases the injection rod of the injector, the injection rod will retract under the action of negative pressure and the spring, causing the support loop of the artificial lens to be easily stuck, and if it retracts accidentally, it may cause discomfort to the eye. Once the silicone head of the injection rod is pushed out of the tube mouth of the folding clamp, it is easy to stir the eye incision when it is retracted. For this reason, the doctor needs to always keep the injection rod of the injector still. The holding action of the doctor or the nursing staff brings inconvenience to the doctor or the nursing staff, and it is not easy to control the advancement amplitude.

[0006] Therefore, the present invention proposes an artificial lens injector with adjustable advancement amplitude to solve the problem that the existing artificial lens advancement amplitude is inconvenient to adjust and the advancement stroke is difficult to accurately control. The advancement amplitude of the artificial lens can be accurately adjusted to ensure that the injection rod accurately pushes the lens out to complete the implantation, ensures that the injection rod will not retract at will, and will not cause the incision to be stirred by excessive advancement of the injection rod. Summary of the invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an intraocular lens injector with adjustable advancement amplitude to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an intraocular lens pusher with adjustable advancement amplitude, comprising a pusher body, the inner cavity of the pusher body is provided with a pusher cavity, the two ends of the pusher body are respectively provided with a pusher crystal loading part and a pusher connecting part, a lens folding clip is movably mounted on the pusher crystal loading part, the lens folding clip is used for placing the intraocular lens, a piston rod is movably mounted inside the pusher body, a pusher plate is fixedly mounted on the upper end of the piston rod, and a movable pusher is fixedly connected to the lower end of the piston rod. A plug plate, the lower end of the piston plate is fixedly connected with an injection rod for injecting an artificial lens, an abutment spring is arranged on the outside of the injection rod, an advancement amplitude adjustment mechanism is arranged between the piston rod and the injection device connection part, the advancement amplitude adjustment mechanism includes a rotating rod and a threaded sleeve rod, the outer surface of the piston rod is movably connected with the upper part of the rotating rod and the lower inner wall of the threaded sleeve rod, a central reserved groove is opened on the central inner surface of the piston rod, a piston rod self-locking assembly is arranged on the inner side of the injection device cavity, and the piston rod self-locking assembly includes a central pull rod and a bevel gear rod.

[0009] Preferably, expansion grooves are respectively provided on the inner walls on both sides of the injection device cavity, and the beveled groove gear rods are fixedly installed on the inner surfaces of the expansion grooves. The beveled groove gear rods are provided in two groups and are mirror-distributed about the central axis of the piston rod.

[0010] Preferably, the rotating rod is an integrally formed structure of a knob and a column, the outer surface of the rotating rod is movably connected to the inner side of the injector connecting part and the upper inner wall of the injector body, and the inner wall of the columnar body of the rotating rod is threadedly connected to the upper outer surface of the threaded sleeve.

[0011] Preferably, avoidance grooves are provided on the inner walls on both sides of the threaded sleeve, and a propulsion limit ring is fixedly connected to the lower outer surface of the threaded sleeve, the outer surface of the propulsion limit ring is slidably connected to the inner wall of the injection cavity, and the upper surface of the propulsion limit ring is movably abutted against the lower end of the rotating rod.

[0012] Preferably, through grooves are provided on the inner walls on both sides of the piston rod, and thrust amplitude limiting plates are provided on the outer sides of the through grooves. The thrust amplitude limiting plates are provided in two groups and are fixedly installed on both sides of the injection plate.

[0013] Preferably, the outer surface of the advancement amplitude limiting plate is slidably connected to the inner wall of the avoidance groove, and a connecting block is fixedly mounted on the outer surface of the advancement amplitude limiting plate.

[0014] Preferably, an elastic card is fixedly connected to a side of the connecting block away from the advancement amplitude limit plate, and the elastic card is in a sheet-like structure inclined outward, and the outer surface of the elastic card is movably engaged with the inner surface of the bevel groove gear rod.

[0015] Preferably, a side groove is formed on the inner wall of one end of the central pull rod away from the symmetrical protrusions, a movable arm is movably connected to the inner surface of the side groove, and the other end of the movable arm is movably connected to the surface of the elastic card.

[0016] Preferably, a central groove is provided on the upper surface of the ejector plate, and the central groove is a stepped inwardly recessed groove body, and the inner surface of the central groove is movably connected to the upper end of the central pull rod.

[0017] Preferably, a symmetrical protrusion is provided at the upper end of the central pull rod, one end of the central pull rod away from the symmetrical protrusion is fixedly connected to a stretch elastic wire, and the other end of the stretch elastic wire is fixedly connected to the bottom surface of the inner cavity of the central reserved groove.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention proposes an intraocular lens pusher with adjustable advancement amplitude. The intraocular lens pusher adopts an advancement amplitude adjustment mechanism to adjust the advancement amplitude of the piston rod, accurately grasps the advancement stroke of the piston rod, and accommodates the center pull rod through structural optimization of the piston rod. In conjunction with the setting of the beveled groove gear rod, the self-locking of the piston rod and the pusher rod during the advancement process is ensured, effectively preventing accidental retraction of the intraocular lens and crystal extrusion caused by mis-pushing. In this way, while meeting the precise implantation of the intraocular lens, it not only improves the accuracy and safety of the operation, but also may reduce the patient's pain and operation time, making the operation safer and more effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the assembly structure of the lens folding clamp and the injector body of the present invention;

[0021] Figure 2 It is a schematic diagram of the disassembly structure of the lens folding clamp and the injector body of the present invention;

[0022] Figure 3 It is a schematic diagram of the disassembled structure of the push syringe body of the present invention;

[0023] Figure 4 It is a schematic diagram of a half-section structure of the present invention;

[0024] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at point A;

[0025] Figure 6 For the present invention Figure 4 A schematic diagram of the enlarged structure at B;

[0026] Figure 7 For the present invention Figure 4 A schematic diagram of the enlarged structure at C;

[0027] Figure 8 It is a schematic diagram of a half-section structure of the push injector body of the present invention;

[0028] Fig. 9 For the present invention Figure 8 A schematic diagram of the structure at D of FIG.

[0029] Fig.10 It is a schematic diagram of the distribution cross-sectional structure of the piston rod and the central pull rod of the present invention;

[0030] Fig.11 For the present invention Fig.10 A schematic diagram of the structure at E of FIG.

[0031] Fig.12 For the present invention Fig.10 A schematic diagram of the structure at F of FIG.

[0032] Fig.13 It is a schematic diagram of the connection structure between the propulsion amplitude adjustment mechanism and the anti-rotation assembly of the present invention;

[0033] Fig.14 It is a schematic diagram of the disassembled cross-sectional structure of the propulsion amplitude adjustment mechanism and the anti-rotation assembly of the present invention;

[0034] Fig.15 For the present invention Fig.14 Schematic diagram of the enlarged structure at G.

[0035] In the figure: 1. injector body; 11. injector crystal loading part; 12. lens folding clamp; 13. injector connecting part; 130. mounting groove; 131. anti-rotation ring plate; 1310. circular ring groove; 132. arc elastic abutment block; 2. piston rod; 23. rotating rod; 231. threaded sleeve rod; 2310. avoidance groove; 232. push limit ring; 20. center reserved groove; 200. through groove; 24. center pull rod; 240. side groove; 241. movable arm rod; 242. elastic card; 243. connecting block; 244. stretch elastic wire; 25. inclined groove gear rod; 21. injector plate; 211. push amplitude limit plate; 210. center groove; 22. piston plate; 221. injector rod; 222. abutment spring; 10. injector cavity; 100. expansion groove. DETAILED DESCRIPTION

[0036] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] For example, see Figure 1-15The present invention provides a technical solution: an intraocular lens pusher with adjustable advancement amplitude, comprising a pusher body 1, an inner cavity of the pusher body 1 is provided with a pusher cavity 10, two ends of the pusher body 1 are respectively provided with a pusher crystal loading part 11 and a pusher connecting part 13, a lens folding clamp 12 is movably installed on the pusher crystal loading part 11, and the lens folding clamp 12 is used for placing the intraocular lens, a piston rod 2 is movably installed inside the pusher body 1, a pusher plate 21 is fixedly installed on the upper end of the piston rod 2, a piston plate 22 is fixedly connected to the lower end of the piston rod 2, a pusher rod 221 for pushing the intraocular lens is fixedly connected to the lower end of the piston plate 22, an abutment spring 222 is provided on the outside of the pusher rod 221, an advancement amplitude adjustment mechanism is provided between the piston rod 2 and the pusher connecting part 13, and the advancement amplitude adjustment mechanism includes a rotating rod 23 and a threaded sleeve rod 231 The outer surface of the piston rod 2 is movably connected with the upper part of the rotating rod 23 and the lower inner wall of the threaded sleeve rod 231. A central reserved groove 20 is opened on the central inner surface of the piston rod 2. A piston rod self-locking assembly is arranged on the inner side of the injector cavity 10. The piston rod self-locking assembly includes a central pull rod 24 and a beveled groove gear rod 25. The intraocular lens injector adopts an advancement amplitude adjustment mechanism to adjust the advancement amplitude of the piston rod 2, accurately grasps the advancement stroke of the piston rod 2, and through the structural optimization of the piston rod 2, the central pull rod 24 is accommodated, and the beveled groove gear rod 25 is set to ensure the self-locking of the piston rod 2 and the injection rod 221 during the advancement process, effectively preventing the accidental retraction of the intraocular lens and the crystal extrusion caused by the wrong push. In this way, while meeting the precise implantation of the intraocular lens, it not only improves the accuracy and safety of the operation, but also may reduce the patient's pain and operation time, making the operation safer and more effective.

[0038] Embodiment 2, refer to the attached Figure 1-15 On the basis of the first embodiment, the present embodiment adds an anti-rotation component: a mounting groove 130 is provided on the central inner wall of the pusher connecting portion 13, an anti-rotation component is provided on the inner side of the mounting groove 130, and the anti-rotation component includes an anti-rotation ring plate 131, the anti-rotation ring plate 131 is fixedly installed on the inner side of the mounting groove 130, a scale plate is provided on the upper outer surface of the anti-rotation ring plate 131, a circular ring groove 1310 is provided in the central inner cavity of the anti-rotation ring plate 131, an arc-shaped elastic abutment block 132 is fixedly installed on the inner ring surface of the circular ring groove 1310, the arc-shaped elastic abutment block 132 is in a "U"-shaped block structure, and the arc-shaped elastic abutment block 132 is made of elastic rubber material throughout, and the curved surface of the arc-shaped elastic abutment block 132 is movably abutted against the outer surface of the rotating rod 23;

[0039] In this embodiment, refer to Figure 5 and Figure 14-15As shown, when the rotating rod 23 rotates to adjust the advancement amplitude of the piston rod 2, the curved surface of the arc-shaped elastic abutment block 132 always contacts the outer annular surface of the rotating rod 23, providing a certain degree of resistance for the surface of the rotating rod 23, ensuring that after the rotating rod 23 rotates to the specified position, it will not rotate without external force, further improving the accuracy of the advancement amplitude adjustment, making the intraocular lens implantation surgery safer and more effective.

[0040] Embodiment 3, refer to the attached Figure 1-15 On the basis of the second embodiment, in order to achieve the adjustment of the overall advancement amplitude of the piston rod 2, the present embodiment proposes that: the rotating rod 23 is an integrally formed structure of a knob and a columnar body, the outer surface of the rotating rod 23 is movably connected to the inner side of the pusher connecting part 13 and the inner wall of the upper end of the pusher body 1, and the inner wall of the columnar body of the rotating rod 23 is threadedly connected to the upper outer surface of the threaded sleeve 231; avoidance grooves 2310 are provided on the inner walls of both sides of the threaded sleeve 231, and a promotion limit ring 232 is fixedly connected to the lower outer surface of the threaded sleeve 231, the outer surface of the promotion limit ring 232 is slidably connected to the inner wall of the pusher cavity 10, and the upper surface of the promotion limit ring 232 is movably abutted against the lower end of the rotating rod 23; through grooves 200 are provided on the inner walls of both sides of the piston rod 2, and a promotion amplitude limit plate 211 is provided on the outer side of the through groove 200, and the promotion amplitude limit plate 211 is provided with two groups and fixedly installed on both sides of the push plate 21;

[0041] In this embodiment, the rotating rod 23 is installed on the inner side of the center of the pusher connection part 13, and the whole is formed by the knob and the columnar body. When the advancement stroke of the advancement amplitude limit plate 211 needs to be adjusted, the knob is first manually rotated to make the columnar body rotate on the inner side of the pusher connection part 13. At this time, the upper part of the threaded sleeve 231 is threadedly adapted to the inner wall of the columnar body at the lower part of the rotating rod 23. Then, the threaded sleeve 231 is longitudinally movable under the rotation of the rotating rod 23. It should be noted that here The push-in limiting ring 232 connected to the lower end of the threaded sleeve 231 can ensure that the threaded sleeve 231 slides on the inner wall of the injection device cavity 10 when the threaded sleeve 231 is threadedly adapted, thereby achieving a guiding and limiting effect on the threaded sleeve 231; on the other hand, when the rotating rod 23 rotates as a whole, the threaded sleeve 231 rises, and the push-in limiting ring 232 can serve as a limiting piece between the threaded sleeve 231 and the rotating rod 23, thereby preventing the threaded sleeve 231 from being completely recovered into the interior of the rotating rod 23;

[0042] It should be noted that a pointer is provided on the surface of the knob of the rotating rod 23. The operator can observe the pointer on the knob of the rotating rod 23 and the dial on the upper part of the anti-rotation ring plate 131. Then, when the threaded sleeve 231 is threaded and adapted to move down to the lowest position by the double limit of the injection cavity 10, the operator pushes the injection plate 21 to make the piston rod 2 move down as a whole. Here, the limit is performed by the advancement amplitude limit plates 211 connected on both sides of the injection plate 21; specifically, refer to Figure 6 As shown, when the advancement amplitude limit plate 211 reaches the lowest position of the avoidance groove 2310, the piston rod 2 as a whole no longer moves downward, so that the longitudinal position of the threaded sleeve 231 is adjusted by adjusting the screwing amplitude of the rotating rod 23, thereby controlling the advancement amplitude of the advancement amplitude limit plate 211, thereby preventing medical staff from accidentally pushing the lens and causing eye discomfort, reducing surgical risks, and improving surgical safety. It further solves the problem that the existing artificial lens injection amplitude is inconvenient to adjust and the injection stroke is difficult to accurately control, and the advancement amplitude of the artificial lens can be accurately adjusted to ensure that the injection rod accurately pushes out the lens to complete the implantation.

[0043] Embodiment 4, refer to the attached Figure 1-15 On the basis of the third embodiment, in order to avoid the accidental retraction of the piston rod 2 during the advancement process, the present embodiment further proposes that: expansion grooves 100 are respectively opened on the inner walls of the two sides of the injection cavity 10, and the inclined groove gear rods 25 are fixedly installed on the inner surface of the expansion groove 100. The inclined groove gear rods 25 are provided with two groups and are mirror-distributed with respect to the central axis of the piston rod 2; the outer surface of the advancement amplitude limit plate 211 is slidably connected to the inner wall of the avoidance groove 2310, and the outer surface of the advancement amplitude limit plate 211 is fixedly installed A connecting block 243 is provided; an elastic card 242 is fixedly connected to the side of the connecting block 243 away from the advancement amplitude limit plate 211, and the elastic card 242 is a sheet-like structure inclined outward, and the outer surface of the elastic card 242 is movably engaged with the inner surface of the inclined groove gear rod 25; a side groove 240 is provided on the inner wall of the end of the central pull rod 24 away from the symmetrical protrusion, and a movable arm rod 241 is movably connected to the inner surface of the side groove 240, and the other end of the movable arm rod 241 is movably connected to the surface of the elastic card 242;

[0044] In this embodiment, expansion slots 100 are provided on the inner walls on both sides of the injection device cavity 10, and the beveled slot gear rod 25 is relatively installed on the inner side of the expansion slot 100. When the piston rod 2 is pushed downward, the advancement amplitude limit plates 211 connected on both sides of the piston rod 2 connect the two groups of connection blocks 243 and the elastic card 242. It is worth noting that the elastic card 242 is an elastic structure and fits with the beveled slot of the beveled slot gear rod 25. As the piston rod 2 moves downward, the elastic card 242 continuously contacts the beveled slot on the beveled slot gear rod 25 and quickly enters the next beveled slot. The matching elastic card 242 and the beveled slot gear rod 25 will not cause the piston rod 2 to move upward accidentally, that is, the piston rod 2 can only make a downward push at this time. The action will not cause the thrust amplitude limit plate 211 to retract; and it should be noted that the center pull rod 24 is slidably installed in the center reserved groove 20 of the piston rod 2. When the piston rod 2 moves downward, the upper end of the center pull rod 24 is always blocked by the thumb of the operator, and at this time the center pull rod 24 as a whole only exists and moves inside the center reserved groove 20. Then, at this time, the stretch elastic wire 244 at the bottom of the center pull rod 24 will not be completely compressed, and there is a certain range of movement. When the piston rod 2 moves downward, the elastic card 242 cooperates with the bevel groove gear rod 25 to continuously deform. Without pulling the center pull rod 24, the elastic card 242 always locks the bevel groove gear rod 25 in one direction, thereby avoiding the retreat of the thrust amplitude limit plate 211.

[0045] Embodiment 5, refer to the attached Figure 1-15 On the basis of the fourth embodiment, in order to realize the unlocking of the piston rod 2 as a whole, the present embodiment further proposes: a central groove 210 is provided on the upper surface of the injection plate 21, the central groove 210 is a stepped inward groove body, and the inner surface of the central groove 210 is movably connected to the upper end of the central pull rod 24; a symmetrical protrusion is provided on the upper end of the central pull rod 24, and a stretching elastic wire 244 is fixedly connected to one end of the central pull rod 24 away from the symmetrical protrusion, and the other end of the stretching elastic wire 244 is fixedly connected to the bottom surface of the inner cavity of the central reserved groove 20;

[0046] In this embodiment, a stepped center groove 210 is provided at the center position of the injection plate 21. When the operator presses the injection plate 21 to push the piston rod 2 to perform the injection action, the upper end of the center pull rod 24 is always kept under the thumb of the operator. When the advancement amplitude limit plate 211 completely implants the artificial lens into the patient's eye, the injector body 1 is removed and the thumb pressing the injection plate 21 is released. At this time, the piston rod 2 will not retract due to the one-way locking of the elastic card 242 and the bevel gear rod 25. However, the symmetrical protrusions at the top position of the center pull rod 24 are affected by the stretching elastic wire 244 at the bottom of the center pull rod 24 and pop up a certain stroke. At this time, the operator hooks the symmetrical protrusions and drives the center pull rod 24 to pull upward as a whole. At this time, the upward force applied to the center pull rod 24 is greater than the force of the stretching elastic wire 244, and the center pull rod 24 is pulled upward. The movable arm rods 241 on both sides of the lower end of the rod 24 are tilted due to the pulling effect, and the two groups of elastic cards 242 are pulled up. At this time, the elastic cards 242 are relatively retracted inward and disengaged from the inclined grooves on the inclined groove gear rod 25, so that the restriction on the injection plate 21 can be released. At this time, the injection plate 21 can be pulled upward to complete the unlocking and realize the recovery of the advancement range limit plate 211; it is worth noting that the through grooves 200 on both sides of the piston rod 2 that pass through the central reserved groove 20 play a role in avoiding the movable arm rods 241; and it should be noted that when the advancement range limit plate 211 is recovered to the inside of the injection device body 1, it is only necessary to loosen the central pull rod 24 to realize the automatic resetting of the elastic card 242. At this time, the elastic card 242 cooperates with the upper side inclined groove of the inclined groove gear rod 25 again, thereby ensuring that the injection device will not cause the piston rod 2 to be pushed accidentally when it is idle.

[0047] Embodiment 6, refer to the attached Figure 1-15 On the basis of the fifth embodiment, the present invention further provides an operation method of an intraocular lens injector with adjustable advancement amplitude:

[0048] Step 1: First, inject viscoelastic into the tube mouth of the lens folding clip 12, and the viscoelastic will flow back to the loading chamber. Use tweezers to place the folded intraocular lens, and then buckle the lens folding clip 12. Insert the shark fin on the buckled lens folding clip 12 into the end of the lens loading part 11 of the injector to ensure that the lens folding clip 12 is installed in place.

[0049] Step 2: According to the required advancement amplitude of the advancement amplitude limit plate 211, manually rotate the knob to make the columnar body rotate inside the pusher connection part 13, and at this time, the upper part of the threaded sleeve 231 is threadedly adapted to the inner wall of the columnar body at the lower part of the rotating rod 23, so that the threaded sleeve 231 moves longitudinally under the rotation of the rotating rod 23, and the advancement limit ring 232 slides on the inner wall of the pusher cavity 10, thereby achieving the guiding and limiting effect on the threaded sleeve 231;

[0050] Step 3: The operator can observe the pointer on the knob of the rotating rod 23 and the dial on the upper part of the anti-rotation ring plate 131. When the threaded sleeve 231 is threaded and adapted to the double limit of the injection device cavity 10 and moves down to the lowest position, the operator pushes the injection plate 21 to make the piston rod 2 move down as a whole. When the advancement amplitude limit plate 211 reaches the lowest position of the avoidance groove 2310, the piston rod 2 will no longer move down as a whole. In this way, by adjusting the screwing amplitude of the rotating rod 23, the longitudinal position of the threaded sleeve 231 is adjusted, and then the advancement amplitude of the advancement amplitude limit plate 211 is controlled, so as to prevent medical staff from accidentally pushing the needle and causing eye discomfort, thereby reducing surgical risks.

[0051] Step 4: When the piston rod 2 is pushed downward, the elastic card 242 fits with the oblique groove of the oblique groove gear rod 25. As the piston rod 2 moves downward, the elastic card 242 continuously contacts the oblique groove on the oblique groove gear rod 25 and quickly enters the next oblique groove. The matching elastic card 242 and the oblique groove gear rod 25 will not cause the piston rod 2 to move up accidentally, that is, the piston rod 2 can only make a downward push at this time, and will not cause the push range limit plate 211 to retract;

[0052] Step 5. After the advancement amplitude limit plate 211 completely implants the artificial lens into the patient's eye, the pusher body 1 is removed and the thumb pressing the pusher plate 21 is released. At this time, the piston rod 2 is still locked by the elastic card 242 and the bevel gear rod 25 and will not retract. However, the symmetrical protrusions at the top of the center pull rod 24 are affected by the stretching elastic wire 244 at the bottom of the center pull rod 24 and pop up a certain stroke. At this time, the operator hooks the symmetrical protrusions and drives the center pull rod 24 to pull upward as a whole. At this time, the upward force applied to the center pull rod 24 is greater than the force of the stretching elastic wire 244, and at this time, the movable arm rods 241 on both sides of the lower end of the center pull rod 24 are tilted due to the pulling effect, and the two groups of elastic cards 242 are pulled. At this time, the elastic cards 242 are relatively retracted inward and disengaged from the bevel grooves on the bevel gear rod 25, so that the restriction on the pusher plate 21 can be released;

[0053] Step 6. Finally, when the advancement amplitude limit plate 211 is recovered into the inside of the injector body 1, it is only necessary to loosen the center pull rod 24 to achieve the automatic reset of the elastic card 242. At this time, the elastic card 242 cooperates with the upper side bevel groove of the bevel groove gear rod 25 again, thereby ensuring that the injector will not cause the piston rod 2 to be pushed accidentally when it is idle.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intraocular lens pusher with adjustable advancement amplitude, comprising a pusher body (1), the inner cavity of the pusher body (1) being provided with a pusher cavity (10), the two ends of the pusher body (1) being provided with a pusher lens loading part (11) and a pusher connecting part (13), respectively, a lens folding clamp (12) being movably mounted on the pusher lens loading part (11), the lens folding clamp (12) being used for placing an intraocular lens, characterized in that: A piston rod (2) is movably mounted inside the pusher body (1); a pusher plate (21) is fixedly mounted on the upper end of the piston rod (2); a piston plate (22) is fixedly connected to the lower end of the piston rod (2); a pusher rod (221) for pushing an intraocular lens is fixedly connected to the lower end of the piston plate (22); an abutment spring (222) is arranged outside the pusher rod (221); and a thrust spring (221) is arranged between the piston rod (2) and the pusher connection portion (13). The thrust amplitude adjustment mechanism comprises a rotating rod (23) and a threaded sleeve rod (231); the outer surface of the piston rod (2) is movably connected to the upper part of the rotating rod (23) and the lower inner wall of the threaded sleeve rod (231); a central reserved groove (20) is provided on the central inner surface of the piston rod (2); a piston rod self-locking assembly is provided on the inner side of the pusher cavity (10); the piston rod self-locking assembly comprises a central pull rod (24) and a beveled toothed rod (25); Expansion grooves (100) are respectively provided on the inner walls of both sides of the injection device cavity (10), and the inclined groove gear rods (25) are fixedly mounted on the inner surfaces of the expansion grooves (100). The inclined groove gear rods (25) are provided in two groups and are distributed in a mirror image with respect to the central axis of the piston rod (2); The rotating rod (23) is an integrally formed structure of a knob and a columnar body, the outer surface of the rotating rod (23) is movably connected to the inner side of the pusher connecting portion (13) and the upper inner wall of the pusher body (1), and the inner wall of the columnar body of the rotating rod (23) is threadedly connected to the upper outer surface of the threaded sleeve rod (231); Avoidance grooves (2310) are provided on the inner walls on both sides of the threaded sleeve (231), and a push-stop ring (232) is fixedly connected to the outer surface of the lower side of the threaded sleeve (231), the outer surface of the push-stop ring (232) is slidably connected to the inner wall of the injection device cavity (10), and the upper surface of the push-stop ring (232) is movably abutted against the lower end of the rotating rod (23).

2. The intraocular lens pusher with adjustable advancement amplitude according to claim 1, characterized in that: Through grooves (200) are provided on the inner walls on both sides of the piston rod (2), and thrust amplitude limiting plates (211) are provided on the outer sides of the through grooves (200). Two groups of thrust amplitude limiting plates (211) are provided and fixedly mounted on both sides of the injection push plate (21).

3. The intraocular lens pusher with adjustable advancement amplitude according to claim 2, characterized in that: The outer surface of the advancement amplitude limiting plate (211) is slidably connected to the inner wall of the avoidance groove (2310), and a connecting block (243) is fixedly mounted on the outer surface of the advancement amplitude limiting plate (211).

4. The intraocular lens pusher with adjustable advancement amplitude according to claim 3, characterized in that: An elastic card (242) is fixedly connected to a side of the connection block (243) away from the advancement amplitude limit plate (211); the elastic card (242) is in a sheet-like structure inclined outward, and the outer surface of the elastic card (242) is movably engaged with the inner surface of the inclined groove gear rod (25).

5. The intraocular lens pusher with adjustable advancement amplitude according to claim 1, characterized in that: A side groove (240) is formed on the inner wall of one end of the central pull rod (24) away from the symmetrical protrusions. A movable arm (241) is movably connected to the inner surface of the side groove (240). The other end of the movable arm (241) is movably connected to the surface of an elastic card (242).

6. The intraocular lens pusher with adjustable advancement amplitude according to claim 2, characterized in that: The upper surface of the injection push plate (21) is provided with a central groove (210), the central groove (210) is a stepped inwardly recessed groove body, and the inner surface of the central groove (210) is movably connected to the upper end of the central pull rod (24).

7. The intraocular lens pusher with adjustable advancement amplitude according to claim 6, characterized in that: A symmetrical protrusion is provided at the upper end of the central pull rod (24), one end of the central pull rod (24) away from the symmetrical protrusion is fixedly connected to a stretch elastic wire (244), and the other end of the stretch elastic wire (244) is fixedly connected to the bottom surface of the inner cavity of the central reserved groove (20).

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