A pre-filled syringe system

Abstract

The application discloses a preassembled injection system, which comprises a sleeve body, a crystal loading assembly and a multi-stage pushing assembly. The crystal loading assembly is fixed at one end of the sleeve body and is used for loading and clamping an implanted lens. The multi-stage pushing assembly comprises a pushing rod and a pushing rod fixing block. The pushing rod is slidingly connected to the sleeve body and can move along the axial direction of the sleeve body under the action of external force. The multi-stage limiting slide on the pushing rod fixing block and the pushing rod are matched to control the pushing rod, so that the pushing rod can be limited by the pushing rod fixing block to perform positioning displacement and retreat during the pushing process, and the end of the pushing rod is separated from the implanted lens. The end of the pushing rod can fill the gap space in the crystal loading assembly during the separation process, release the extrusion on the posterior haptic of the implanted lens, avoid the posterior haptic from being clamped into the gap between the introduction head and the end of the pushing rod during the injection process, and solve the problem of the clamped haptic.

Description

Technical Field

[0001] This invention belongs to the technical field of intraocular lens injectors, and specifically relates to a pre-loaded injector system. Background Technology

[0002] In existing technologies, intraocular lens (IOL) implantation is a surgical method for treating cataracts. During the IOL implantation surgery, an IOL injector is used to guide and insert the IOL into the patient's eye. However, current IOL injectors have many problems. 1. Existing non-pre-loaded intraocular lens (IOL) implantation systems require the operator to use both hands. First, the operator uses forceps to remove the IOL from the packaging and place it into the IOL implantation device. Then, the operator uses a folding device to fold the IOL. Finally, the IOL is implanted into the eye through the implantation device. The implantation process is complex and cumbersome, and there is a risk of bacterial infection during use or storage. It is very inconvenient to use and prone to various uncontrollable problems. For example, if the angle of the forceps is incorrect or the force is not properly controlled when holding the IOL, it can cause irreversible damage to the IOL. In addition, the IOL needs to be folded manually before being placed into the implantation device, making it difficult to accurately judge its implantation angle and status during the operation, which can easily lead to operator errors and increase surgical risks.

[0003] 2. The existing plunger has a silicone tip at the front end to prevent damage to the lens during injection. However, due to the softness of silicone, the silicone tip can easily press against the posterior posterior haptic of the lens during injection, causing the posterior haptic to become stuck in the gap between the plunger and the silicone tip, resulting in haptic jamming. In this situation, continued injection may pull or even break the posterior posterior haptic of the intraocular lens, ultimately leading to surgical failure.

[0004] 3. Chinese Patent Publication No. CN215779107U discloses a pre-loaded intraocular lens implantation system, including an implantation pusher, an implantation push rod that moves along the axial direction of the implantation pusher, and an intraocular lens loading cavity detachably connected to the implantation pusher. The central axes of the implantation push rod, the implantation pusher, and the intraocular lens loading cavity coincide with each other and are in the same direction as the diameter direction of the intraocular lens in the unfolded state loaded in the intraocular lens loading cavity. The implantation pusher includes a pusher body, a placement groove for the intraocular lens loading cavity, and an implantation channel that are connected sequentially along the implantation direction. The front end of the implantation pusher has a U-shaped / Y-shaped clamping fork, the length of which is at least greater than or equal to the radius of the intraocular lens. The diameter of the implantation channel, used for folding or rolling the intraocular lens, decreases along the implantation direction and its exit end is obliquely cut.

[0005] The aforementioned patent describes a process where an implantation pusher is pre-assembled with the body of an implantation pusher tube. The intraocular lens loading cavity is inserted into the placement slot of the implantation pusher tube. The implantation pusher is then advanced along the implantation direction, passing through the pusher tube body and the placement slot before entering the intraocular lens loading cavity. The intraocular lens is held in place by a clamping fork at the front end. As the implantation pusher advances, the intraocular lens is pushed to the entrance of the implantation channel. As the inner wall of the implantation channel gradually narrows, it compresses the intraocular lens, causing it to curl further. When the intraocular lens reaches the exit of the implantation channel, it is fully curled. Finally, the implantation pusher pushes the intraocular lens out of the implantation channel and into the eye, completing the implantation operation.

[0006] This structure requires a clamping fork to hold the crystal during injection. Since the clamping fork is usually made of rigid material, it can easily scratch the crystal when it comes into contact with it. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies, this invention provides a pre-loaded injector system to solve technical problems such as easy jamming during the push process of existing pre-loaded injectors, the need for manual adjustment before injection, and the easy scratching of crystals by the clamping fork.

[0008] To achieve the above objectives, the specific technical solution of the present invention is as follows: A pre-loaded injector system includes a cannula body, a lens loading assembly, and a multi-stage delivery assembly. The lens loading assembly is fixed to one end of the cannula body for loading and holding the lens to be implanted.

[0009] The multi-stage pushing assembly includes a pushing rod and a pushing rod fixing block. The pushing rod is slidably connected to the sheath body and can move along the axis of the sheath body under the action of external force. The central axis of the pushing rod is eccentrically set with respect to the lens loading assembly, so that when the pushing end of the multi-stage pushing assembly extends into the lens loading assembly, it will abut against the middle of the posterior support haptic of the lens to be implanted and push it forward.

[0010] The push rod has multiple sequentially connected limiting slides. The push rod fixing block is installed on the sleeve body, and its inner end can switch sequentially within each limiting slide. During the switching process, its pushing stroke is gradually limited and controlled, so that the push rod can be advanced in stages.

[0011] The push rod can be positioned and retracted under the limiting control of the push rod fixing block, causing the end of the push rod to separate from the lens to be implanted. The end of the push rod can fill the gap space within the lens loading assembly during the separation process, relieving the compression of the posterior support haptic of the lens to be implanted.

[0012] Furthermore, the multi-stage pushing assembly also includes a return spring and a silicone head. The return spring is sleeved on the outside of the pushing rod and is used to provide an outward elastic return force to the pushing rod fixing block. The silicone head is installed at the outer end of the pushing rod.

[0013] Furthermore, the push rod is sequentially divided into a push section, a locking adjustment section, and a push rod section along the axial direction. The push section extends into the sleeve body. The locking adjustment section has a clearance groove. An elastic retainer is provided at the top edge of the clearance groove. The top of the elastic retainer extends upward and protrudes from the opening of the clearance groove. The sleeve body has two locking slots that cooperate with the elastic retainer. The two locking slots are spaced apart along the axial direction of the sleeve body.

[0014] Furthermore, the two locking slots are divided into a first slot away from the lens pre-loading box and a second slot closer to the lens pre-loading box. The length of the first slot matches the tip of the elastic clip, enabling stable engagement of the tip of the elastic clip in the initial state. The length of the second slot is greater than the tip size of the elastic clip.

[0015] Furthermore, the limiting slide has three levels: an initial slide, a pushing slide, and an end slide. The initial slide and the end slide are respectively located at both ends of the pushing slide and are arranged side by side with it. The initial slide and the end slide have switching openings on their adjacent side edges to cooperate with the limiting hooks on the push rod fixing block.

[0016] Furthermore, a locking protrusion is provided at the bottom of the switching opening. A guide slope is provided on one side of the locking protrusion. The guide slope is inclined toward the pushing direction of the push fixing block, and is used to limit the limiting hook on the push rod fixing block during the limiting sliding switching.

[0017] Furthermore, the switching opening located between the end slide and the push slide is spaced apart from the end of the push slide, with the spacing being greater than or equal to the length of the second slot.

[0018] Furthermore, the lens loading assembly includes a lens pre-loading cassette and an insertion head. The lens pre-loading cassette has a lens slot that matches the lens to be implanted, used to define the initial position of the lens. The bottom surface of the lens slot has a push-through groove that matches the size of the push-end of the multi-stage push-through assembly. The central axis of the push-through groove is offset from the lens slot. The insertion head is mounted on the outer end of the lens loading assembly.

[0019] Furthermore, the lens pre-loading box has an open-top box structure, with an inner cavity forming a lens pre-loading chamber. The lens slot is formed on the bottom surface of the lens pre-loading chamber and has a stepped structure, which is divided into an optical zone support surface and a haptic support surface from bottom to top.

[0020] Furthermore, the lens pre-loading chamber has inwardly protruding limiting protrusions on both side walls near the inlet. These limiting protrusions are spaced apart from the haptic support surface in the lens pre-loading box, forming a posterior haptic limiting slide for accommodating the end of the posterior support haptic of the lens to be implanted. The lens pre-loading chamber also has an anterior haptic placement groove near the outlet end that mates with the end of the anterior support haptic of the lens to be implanted.

[0021] Compared with the prior art, the present invention has the following advantages: 1. This invention utilizes a push rod fixing block and a multi-stage limiting slide rail on the push rod for control. This allows the push rod to be restricted by the push rod fixing block during the pushing process, enabling positioning displacement and retraction, thus separating the end of the push rod from the lens to be implanted. The end of the push rod can fill the gap space within the lens loading assembly during separation, relieving pressure on the posterior support haptic of the lens to be implanted. This prevents the posterior haptic from getting stuck in the gap between the inlet head and the end of the push rod during injection, solving the haptic problem and avoiding pulling or even breaking the posterior haptic of the artificial lens during injection, thereby reducing the risk of surgical failure.

[0022] 2. In this invention, the central axis of the push rod is eccentrically set with respect to the lens loading assembly. This ensures that when the push end of the multi-stage push assembly is inserted into the lens loading assembly, it will abut against the middle of the posterior support haptic of the lens to be implanted. This prevents the silicone tip from pressing against the optical zone of the lens to be implanted during the initial injection process, thus avoiding damage to the optical zone. At the same time, it precisely applies force to the posterior support haptic, ensuring the stability of the injection action.

[0023] 3. This invention, by setting a stepped lens slot on the lens pre-loading box, in conjunction with the limiting protrusions on both sides, the posterior haptic limiting slide, and the anterior haptic placement groove, can directly complete the positioning and limiting of each part of the artificial lens during the pre-loading stage. During the operation, the operator does not need to readjust the position and posture of the lens, reducing the number of operation steps, reducing the difficulty of the operation and the risk of bacterial infection. At the same time, it avoids accidental damage to the lens when manually adjusting the position and posture, further reducing the surgical risk. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the multi-level push component in this invention; Figure 3 This is a schematic diagram showing the relative positions of the silicone tip and the lens to be implanted in this invention. Figure 2 (Enlarged view of part A in the middle) Figure 4 This is a schematic diagram showing the relative position of the push rod within the sleeve body in this invention; Figure 5This is a schematic diagram showing the position of the elastic clip on the push rod and the sleeve body in this invention. Figure 4 (Enlarged view of part B in the middle section) Figure 6 This is a schematic diagram of the overall structure of the push rod in this invention; Figure 7 for Figure 6 Enlarged view of part C in the middle; Figure 8 This is a schematic diagram showing the relative positions of the various levels of limiting slides in this invention; Figure 9 This is a schematic diagram showing the relative positions of the push rod fixing block and the limiting slide in this invention. Figure 8 (Cross-sectional view along the DD direction). Figure 10 This is a schematic diagram of the structure of the lens pre-loading box in this invention; Figure 11 This is a schematic diagram illustrating the changes in the lens to be implanted during the retraction of the push rod in this invention.

[0025] Reference numerals: 1. Lens to be implanted; 2. Cannula body; 2-1. First slot; 2-2. Second slot; 3. Lens loading assembly; 4. Multi-stage pushing assembly; 5. Pushing rod; 5-1. Pushing part; 5-2. Locking adjustment part; 5-3. Pushing rod part; 6. Pushing rod fixing block; 7. Limiting slide; 7-1. Initial slide; 7-2. Pushing slide; 7-3. End slide; 8. Limiting hook; 9. Reset spring; 10. Silicone head; 11. Elastic clip; 12. Locking protrusion; 13. Lens pre-loading box; 13-1. Optical zone support surface; 13-2. Loop support surface; 13-3. Limiting protrusion; 13-4. Anterior locule placement groove; 14. Introducing head. Detailed Implementation

[0026] In the description of this invention, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] like Figure 1 and Figure 2As shown, a pre-loaded injector system includes a cannula body 2, a lens loading assembly 3, and a multi-stage pushing assembly 4. The lens loading assembly 3 is fixed to one end of the cannula body 2 and is used to load and hold the lens 1 to be implanted.

[0029] The multi-stage pushing component 4 includes a pushing rod 5 and a pushing rod fixing block 6. The pushing rod 5 is slidably connected to the cannula body 2 and can move along the axis of the cannula body 2 under the action of external force, thereby pushing the loaded lens 1 to be implanted.

[0030] like Figure 3 As shown, the central axis of the push rod 5 is eccentrically positioned with respect to the lens loading assembly 3, so that when the push end of the multi-stage push assembly 4 extends into the lens loading assembly 3, it will abut against the middle of the posterior support haptic of the lens 1 to be implanted and push it forward. The posterior support haptic deforms during the push process, and the deformation amplitude of the end and the root is consistent.

[0031] The push rod 5 has multiple sequentially connected limiting slides 7. The push rod fixing block 6 is installed on the sleeve body 2, and its inner end is provided with a limiting hook 8 that is adapted to each limiting slide 7. The limiting hook 8 can engage with the corresponding limiting slide 7 when the push rod 5 moves to the corresponding position, thereby realizing step-by-step limiting and unlocking during the pushing process of the push rod 5.

[0032] In actual use, the injector has three working states with the cooperation of the push rod fixing block 6 and the upper limit slide 7 of the push rod 5: initial locking state, crystal pushing state, and crystal implantation state.

[0033] In the initial locked state, the limit hook 8 engages with the limit slide 7 of the push rod 5 closest to the push rod fixing block 6, restricting the push rod 5 from moving forward and preventing the push rod 5 from sliding before the pre-installation is completed.

[0034] When the injector switches from the initial locked state to the lens pushing state, external force pushes the push rod fixing block 6 to move towards the corresponding limiting slide 7. The limiting hook 8 of the push rod fixing block 6 undergoes slight deformation and disengages from the current limiting slide 7, entering the limiting slide 7 corresponding to the lens pushing state. The push rod 5 continues to advance forward until it reaches the end of the limiting slide. Under the action of the push rod 5, the lens to be implanted 1 is gradually pushed out of the lens loading assembly 3, and the folded lens tip gradually extends out of the injector and enters the preset position in the human eye.

[0035] When switching from the lens pushing state to the lens implantation state, the displacement is reversed, causing the end of the push rod 5 to separate from the lens 1 to be implanted. During the retraction process, the end of the push rod 5 first fills the gap space within the lens loading assembly 3 to prevent the lens 1 to be implanted from getting stuck in the gap between the end of the push rod 5 and the lens loading assembly 3, thus avoiding jamming.

[0036] After the retraction is completed, an external force is applied to the push rod fixing block 6 to make it move outward. The limiting hook 8 disengages from the current limiting slide 7 and is inserted into the limiting slide 7 corresponding to the lens implantation state. At this time, the push rod 5 moves to the foremost position and completely pushes the lens 1 to be implanted out of the injector, completing the lens implantation operation.

[0037] Furthermore, the multi-stage pushing assembly 4 also includes a return spring 9 and a silicone head 10. The return spring 9 is sleeved on the outside of the pushing rod 5 to provide an outward elastic restoring force to the pushing rod fixing block 6. The silicone head 10 is installed at the outer end of the pushing rod 5.

[0038] When the lens to be implanted 1 enters the implantation head 14, the push rod 5 is retracted by the elastic force of the return spring 9, causing both the silicone head 10 and the curled lens to be implanted 1 to elastically recover. Due to the low hysteresis rebound characteristics of the silicone material, the rebound speed is faster than that of the lens to be implanted 1, resulting in complete separation of the silicone head 10 from the lens to be implanted 1. In the narrow cavity of the implantation head, the large-sized silicone head, due to its low hysteresis rebound characteristics, preferentially fills the cavity of the implantation head, and the tip of the silicone head fully contacts the end face of the lens to be implanted, eliminating localized stress. This prevents the lens from being misaligned or damaged during implantation due to haptics, thus improving the error tolerance of the implantation operation.

[0039] like Figure 4 and 6 As shown, the push rod 5 is divided into a push part 5-1, a locking adjustment part 5-2, and a push rod part 5-3 along the axial direction. The push part 5-1 extends into the sleeve body 2. A return spring 9 is fitted onto the outer ring of the push part 5-1. A silicone head 10 is fixed to the inner end of the push part 5-1. The locking adjustment part 5-2 has a clearance groove. An elastic retainer 11 is provided at the top edge of the clearance groove. The elastic retainer 11 has a hook-shaped structure, with its top extending upwards and protruding from the opening of the clearance groove. The sleeve body 2 has two locking slots that cooperate with the elastic retainer 11. The two locking slots are spaced apart along the axial direction of the sleeve body 2.

[0040] like Figure 5As shown, in the initial state, the top of the elastic clip 11 is engaged in the locking groove on the side away from the lens pre-loading box 13, which is used to further lock the initial position of the push rod 5. When the push rod fixing block 6 is pushed into the limiting slide 7 corresponding to the lens pushing state, and the operator applies pushing pressure to the push rod 5, the top of the elastic clip 11 deforms and disengages from the locking groove, and the push rod 5 can then be pushed forward until the top of the elastic clip 11 is engaged in the locking groove on the side closer to the lens pre-loading box 13.

[0041] like Figure 7 As shown, in this embodiment, the elastic clip 11 has an inclined pushing slope on the side near the lens pre-loading box 13, and a vertical locking surface on the opposite side.

[0042] When the push rod fixing block 6 applies pressure to the push rod 5, it applies downward pressure to the elastic locking member 11 along the pushing surface, causing the top of the elastic locking member 11 to disengage from the locking groove. After the top of the elastic locking member 11 is engaged in the locking groove near the lens pre-loading box 13, the vertical locking surface abuts against the side wall of the locking groove, preventing the push rod 5 from excessively rebounding under the push of the return spring 9, so that the push rod 5 is always in the required position.

[0043] Furthermore, the two locking slots are divided into a first slot 2-1, which is farther away from the lens pre-loading box 13, and a second slot 2-2, which is closer to the lens pre-loading box 13. The length of the first slot 2-1 matches the tip of the elastic clip 11, enabling stable engagement of the tip of the elastic clip 11 in the initial state. The length of the second slot 2-2 is greater than or equal to the tip size of the elastic clip 11, providing retraction space to the push rod 5 in the event of lap entrapment of the lens 1 to be implanted.

[0044] In actual operation, the operator first pushes the push rod retainer into the limiting slide 7 corresponding to the lens pushing state, and applies pressure to the push rod 5 to push the lens 1 to be implanted forward. The elastic retainer 11 on the push rod 5 gradually disengages from the first slot 2-1 and moves towards the second slot 2-2 until it enters the second slot 2-2 or disengages from the second slot 2-2 and moves further towards the lens pre-loading box 13. When the push rod 5 pushes the lens 1 to be implanted into the inlet head 14, the operator releases the pressure applied to the push rod 5. The push rod 5 retracts under the push of the return spring 9 until the top of the elastic retainer 11 stops moving against the side wall of the second slot 2-2 away from the lens pre-loading box 13. At this time, the retraction distance of the push rod 5 is limited by the second slot 2-2, and excessive rebound will not cause the push rod 5 to return to its initial position completely. At the same time, the silicone head 10 on the push rod 5 retracts with the push rod 5 and separates from the lens 1 to be implanted.

[0045] During the retraction process, the silicone tip 10 rebounds faster than the lens 1 to be implanted. After rebounding, the silicone tip 10 first fills the space within the inlet head 14, helping to release the clasp. After releasing the clasp of the lens 1 to be implanted, the operator can apply forward pushing force to the push rod 5 again until the lens implantation is completed.

[0046] like Figure 8 As shown, in this embodiment, the limiting slide 7 has three levels, corresponding to the three working states of the injector. The three-level limiting slide 7 is divided into an initial slide 7-1, a pushing slide 7-2, and an end slide 7-3. The initial slide 7-1 and the end slide 7-3 are respectively located at both ends of the pushing slide 7-2 and are arranged side by side with it. The initial slide 7-1 and the end slide 7-3 are provided with switching openings on the adjacent side edges of the pushing slide 7-2, which cooperate with the limiting hooks 8 on the push rod fixing block 6. In the initial locked state, the limiting hooks 8 are engaged in the initial slide 7-1. When it is necessary to switch to the crystal pushing state, the operator pushes the push rod fixing block 6 towards the pushing slide 7-2. The limiting hook 8 on the push rod fixing block 6 enters the push slide 7-2 from the corresponding switching opening. At this time, the limiting hook 8 releases the axial locking of the push rod 5, and the push rod 5 can move forward along the axis of the sleeve body 2 under the push of external force, driving the push rod 5 to gradually push the lens 1 to be implanted.

[0047] like Figure 9 As shown, in this embodiment, a locking protrusion 12 is provided at the bottom of the switching opening. A guide slope is provided on one side of the locking protrusion 12. The guide slope is inclined towards the pushing direction of the push fixing block, and is used to limit the movement of the limiting hook 8 on the push rod fixing block 6 during the limiting sliding switch. In actual operation, when the operator needs to push the push rod fixing block 6 from the initial slide 7-1 to the push slide 7-2, the limiting hook 8 passes through the corresponding switching opening, and the guide slope on the locking protrusion 12 guides the movement of the limiting hook 8, causing it to be squeezed and deformed until it passes the locking protrusion 12 and enters the push slide 7-2. At this time, the locking protrusion 12 forms a reverse limit on the push rod fixing block 6, preventing the limiting hook 8 from accidentally returning to the initial slide 7-1.

[0048] Furthermore, the switching opening located between the end slide 7-3 and the push slide 7-2 is spaced apart from the end of the push slide 7-2, with the distance being greater than or equal to the length of the second slot 2-2. This ensures that when the push rod 5 rebounds to its limit position, the limiting hook 8 on the push rod fixing block 6 is aligned with the switching opening located between the end slide 7-3 and the push slide 7-2. The operator can push the push rod fixing block 6 to push the limiting hook 8 from the switching opening into the end slide 7-3, completing the state switch. At this time, the silicone head 10 and the lens 1 to be implanted are released from the latch. The lens 1 to be implanted can be completely pushed out of the injector by pushing the push rod 5 forward again, completing the implantation operation.

[0049] In this embodiment, a mounting slot is formed on the sleeve body to mate with the push rod fixing block 6. The push rod fixing block 6 is slidably connected in the mounting slot and can slide along the pushing direction perpendicular to the push rod 5. The push rod fixing block 6 includes a gripping part at the outer end and a mounting part at the inner end. The mounting part is provided with two spaced-apart limiting members. A limiting groove is formed on the side of the push rod 5 to mate with the two limiting members. The limiting members extend toward one side of the push rod 5 and into the limiting groove to limit the circumferential position of the push rod 5 during pushing, preventing the push rod 5 from circumferentially deflecting during the pushing process.

[0050] like Figure 10 As shown, the lens loading assembly 3 includes a lens pre-loading box 13 and an insertion head 14. The lens pre-loading box 13 has a lens slot matching the lens to be implanted 1, used to define the initial position of the lens 1. The bottom surface of the lens slot has a push-through groove matching the size of the push-end of the multi-stage push assembly 4. The central axis of the push-through groove is offset from the lens slot, so that after the push-end passes through the push-through groove, it can abut against the middle of the posterior support haptic of the lens 1, avoiding uneven force during push-through that could cause uneven deformation of the end and root of the posterior support haptic, affecting subsequent lens implantation. The insertion head 14 is installed at the outer end of the lens loading assembly 3, used to receive the lens 1 output from the lens loading assembly 3 and guide it to curl.

[0051] In this embodiment, the lens pre-loading box 13 has an open-top box structure, with an inner cavity forming a lens pre-loading chamber. The lens pre-loading box 13 has an inlet and an outlet at each end, respectively, communicating with the pre-loading chamber. The inlet communicates with the inner cavity of the cannula body 2. The pushing end of the multi-stage pushing assembly 4 extends into the pre-loading chamber through the inlet. The outlet communicates with the inner cavity of the inlet head 14. The front haptic is detachably fixed at the top opening of the lens pre-loading box 13.

[0052] The lens holder is located on the bottom surface of the lens pre-loading chamber and has a stepped structure, consisting of an optical zone support surface 13-1 and a haptic support surface 13-2 from bottom to top. When the lens 1 to be implanted is placed into the pre-loading chamber, the optical zone support surface 13-1 supports the optical portion of the lens, while the haptic support surface 13-2 supports the two support haptics. The stepped difference in height allows the support haptics to fold smoothly onto the surface of the optical portion and curl during the advancement of the lens 1.

[0053] Furthermore, on the two side walls of the lens pre-loading chamber near the inlet, there are inwardly protruding limiting protrusions 13-3. The limiting protrusions 13-3 are spaced apart from the haptic support surface 13-2 in the lens pre-loading box 13, forming a posterior haptic limiting slide 7 to accommodate the end of the posterior support haptic of the lens 1 to be implanted, which is used to limit the end of the posterior support haptic. The lens pre-loading chamber near the outlet has an anterior haptic placement groove 13-4 that mates with the end of the anterior support haptic of the lens 1 to be implanted, which is used to limit the end of the anterior support haptic.

[0054] Furthermore, an anterior haptic catch is detachably fixed at the opening of the lens pre-loading cassette 13. The anterior haptic catch has two spaced-apart locking protrusions. When the anterior haptic catch is installed into the lens pre-loading cassette 13, the two locking protrusions can extend into the inner cavity of the lens pre-loading cassette 13 and, through the anterior support haptic of the lens to be implanted, complete the positioning and fixation of the anterior end of the lens.

[0055] During the actual installation process, the operator first places the inverted "S"-shaped lens 1 to be implanted into the lens pre-loading chamber, so that the optical base rests on the optical zone support surface 13-1, and the two support haptics are respectively placed on the haptic support surface 13-2. Then, the lens is rotated counterclockwise, so that the ends of the two posterior support haptics are respectively engaged in the corresponding posterior haptic limiting slides 7, and the end of the anterior support haptics is engaged in the corresponding anterior haptic placement groove 13-4. Next, the anterior haptic clips are snapped into the top opening of the lens pre-loading box 13, with two snap-fit ​​protrusions extending into the chamber and engaging in the corresponding positions of the anterior support haptics. After the lens insertion and positioning are completed, the multi-stage pushing component 4 pushes the lens 1 to be implanted multiple times to achieve smooth curling and implantation of the lens 1.

[0056] The specific operating process of this invention is as follows: First, the operator places the inverted "S"-shaped lens 1 to be implanted into the lens pre-loading chamber, ensuring the optical base rests on the optical zone support surface 13-1, with the two support haptics positioned on the corresponding haptic support surfaces 13-2. Then, the lens is rotated counter-clockwise, causing the ends of the two posterior support haptics to engage with the corresponding posterior haptic limiting slides 7, and the end of the anterior support haptic to engage with the corresponding anterior haptic placement groove 13-4. Next, the anterior haptic clips are secured to the top opening of the lens pre-loading box 13, with two clip protrusions extending into the chamber and engaging with the corresponding positions of the anterior support haptics. Finally, the outer casing is closed, completing the pre-loading and positioning of the lens 1 to be implanted.

[0057] Next, the operator pushes the push rod fixing block 6, causing the limiting hook 8 on the push rod fixing block 6 to pass through the switching opening and over the locking protrusion 12 before entering the push slide 7-2. The operator applies a forward pushing force to the push rod 5, and the elastic clip 11 deforms under pressure and disengages from the first slot 2-1. The push rod 5 drives the push end to move forward, gradually pushing the lens 1 to be implanted towards the guide head 14. The folded lens is gradually pushed into the guide head 14, while the top of the elastic clip 11 engages with the second slot 2-2.

[0058] Subsequently, as Figure 11 As shown, the operator releases the pushing pressure, and the push rod 5 retracts under the action of the return spring 9 until the top of the elastic clip 11 stops against the side wall of the second clip groove 2-2. The push rod 5 drives the silicone head 10 to retract and separate. The silicone head 10 rebounds faster than the lens 1 to be implanted. After rebounding, it squeezes the lens in the clip to release the clip. After adjusting the posture, the limiting hook 8 of the push rod fixing block 6 is aligned with the switching opening of the end slide 7-3. Push the push rod fixing block 6 to push the limiting hook 8 into the end slide 7-3. Push the push rod 5 forward again to completely push the lens 1 to be implanted out of the injector.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pre-loaded injector system, characterized in that: It includes a cannula body, a lens loading assembly, and a multi-stage pushing assembly; the lens loading assembly is fixed to one end of the cannula body and is used to load and hold the lens to be implanted. The multi-stage pushing component includes a pushing rod and a pushing rod fixing block; the pushing rod is slidably connected inside the cannula body and can move along the axis of the cannula body under the action of external force; the central axis of the pushing rod is eccentrically set with the lens loading component, so that when the pushing end of the multi-stage pushing component extends into the lens loading component, it will abut against the middle of the posterior support haptic of the lens to be implanted and push it forward. The push rod has multiple levels of sequentially connected limiting slides; the push rod fixing block is installed on the sleeve body, and the inner end can switch sequentially in each level of limiting slide, and the push stroke is gradually limited and controlled during the switching process, so that the push rod can be pushed forward in stages; The push rod can be positioned and retracted under the limiting control of the push rod fixing block, so that the end of the push rod separates from the lens to be implanted; the end of the push rod can fill the gap space in the lens loading assembly during the separation process, and relieve the compression of the support haptic of the lens to be implanted. The push rod is divided into a push part, a locking adjustment part, and a push rod part along the axial direction; the push part extends into the sleeve body; the locking adjustment part is provided with a clearance groove; an elastic clip is provided at the top edge of the clearance groove; the top of the elastic clip extends upward and protrudes from the groove opening of the clearance groove; the sleeve body is provided with two locking slots that cooperate with the elastic clip; the two locking slots are spaced apart along the axial direction of the sleeve body. The two locking slots are divided into a first slot away from the lens pre-loading box and a second slot close to the lens pre-loading box; the length of the first slot matches the tip of the elastic clip, enabling stable engagement of the tip of the elastic clip in the initial state; the length of the second slot is greater than or equal to the tip size of the elastic clip. The limiting slide has three levels: an initial slide, a pushing slide, and an end slide. The initial slide and the end slide are respectively set at both ends of the pushing slide and are arranged side by side with it. The initial slide and the end slide are provided with switching openings on the side edges adjacent to the pushing slide to cooperate with the limiting hooks on the push rod fixing block. The bottom of the switching opening is provided with a locking protrusion; a guide slope is provided on one side of the locking protrusion; the guide slope is inclined toward the pushing direction of the push fixing block, and is used to limit the limit hook on the push rod fixing block when the limit sliding switch is performed.

2. The pre-loaded injector system according to claim 1, characterized in that: The multi-stage pushing assembly also includes a return spring and a silicone head; the return spring is sleeved on the outside of the pushing rod and is used to provide an outward elastic return force to the pushing rod fixing block; the silicone head is installed on the outer end of the pushing rod.

3. The pre-loaded injector system according to claim 1, characterized in that: The switching opening located between the end slide and the push slide is spaced apart from the end of the push slide, with the distance being greater than or equal to the length of the second slot.

4. The pre-loaded injector system according to claim 1, characterized in that: The lens loading assembly includes a lens pre-loading box and an implantation head; the lens pre-loading box has a lens slot that matches the lens to be implanted, which is used to define the initial position of the lens to be implanted; the bottom surface of the lens slot has a push channel that matches the size of the push end of the multi-stage push assembly; the central axis of the push channel is eccentrically set with respect to the lens slot; the implantation head is installed at the outer end of the lens loading assembly.

5. A pre-loaded injector system according to claim 4, characterized in that: The lens pre-loading box has an open top and an inner cavity forming a lens pre-loading chamber. The lens slot is located on the bottom surface of the lens pre-loading chamber and has a stepped structure, which is divided into an optical zone support surface and a haptic support surface from bottom to top.

6. A pre-loaded injector system according to claim 5, characterized in that: On the two side walls of the lens pre-loading chamber near the inlet, there are inwardly protruding limiting protrusions; the limiting protrusions are spaced apart from the haptic support surface in the lens pre-loading box, forming a posterior haptic limiting slide for accommodating the end of the posterior support haptic of the lens to be implanted; the lens pre-loading chamber near the outlet has an anterior haptic placement groove that mates with the end of the anterior support haptic of the lens to be implanted.

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