Apparatus for repeated loading and fixing
By designing a reloading fixation device, the operational complexity of biological patch fixation devices when repeatedly loading implants was solved, achieving efficient multiple fixation and a simplified surgical procedure, thus improving surgical efficiency and safety.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- HANGZHOU REJOIN MASTIN MEDICAL INSTR CO LTD
- Filing Date
- 2025-12-15
- Publication Date
- 2026-07-02
Smart Images
Figure CN2025142433_02072026_PF_FP_ABST
Abstract
Description
Repeated loading fixing device
[0001] Related applications
[0002] This application claims priority to Chinese patent application No. 202411959643.9, filed on December 27, 2024, entitled "Repeated Loading Fixing Device", the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of medical device technology, and in particular to a reloadable fixation device. Background Technology
[0004] Biological patches are widely used in surgery, especially in tendons, ligaments, and other connective tissues that link bones and muscles. With advancements in medical technology, biological patches not only provide immediate structural support but also promote tissue regeneration within the body, thus accelerating the healing process. For torn or severely damaged soft tissues, biological patches offer an effective alternative, strengthening local tissues and creating favorable conditions for new tissue growth by fixing the patch to the damaged area. However, to ensure stable attachment of the biological patch to the soft tissue being repaired, specially designed fixation devices are necessary. Traditional fixation methods typically rely on sutures or metal staples, but these methods can cause additional trauma and, in some cases, are difficult to guarantee long-term stability. In contrast, modern fixation devices employ a more advanced design concept; they can directly penetrate the biological patch and integrate tightly with the soft tissue by ejecting the fixation implant, forming a stable point. Therefore, in practical clinical applications, physicians face the dual challenge of pursuing both high efficiency and ensuring safety.
[0005] Biological patches typically require six or more fixation implants to secure them to the soft tissue being repaired. Therefore, the operator often needs to repeatedly insert and remove fixation implants and tendon fixation devices during a single repair surgery, making the procedure complex and time-consuming.
[0006] To address this, related technologies have developed fixation devices capable of continuously activating the fixation of implants. For example, US Patent 9498211B2 discloses an application instrument for deploying surgical fasteners. This instrument can activate the fasteners multiple times during a single surgical procedure to fix biological patches and tendons to be repaired. However, it cannot reload the fasteners onto the application instrument; if the patient requires fixation beyond the portion already installed by the fixation device, multiple instruments are needed. Summary of the Invention
[0007] Therefore, it is necessary to provide a reusable loading and fixing device.
[0008] This application provides a reloadable fixation device, including a handle, a cannula, an implant, a firing assembly, a drive assembly, and an unlocking mechanism: the handle has a proximal end and a distal end; the cannula is disposed at the distal end of the handle; the implant is disposed within the cannula; the firing assembly includes a firing rod and a push rod, the firing rod and the push rod extending from the handle into the cannula, the push rod pushing the implant distally, and the firing rod firing the implant located at the distal end; the drive assembly is used to drive the push rod to move distally and has a limiting mechanism that restricts the push rod from moving towards the proximal end of the handle; the unlocking mechanism is used to release the limiting mechanism to allow the push rod to move towards the proximal end of the handle.
[0009] In one embodiment, the drive assembly includes a drive member capable of reciprocating between the proximal and distal ends of the handle, the drive member being provided with an elastic arm, and the push rod being provided with at least one guide portion along its length; when the elastic arm moves distally with the drive member, the elastic arm abuts against the guide portion to drive the push rod distally, and when the elastic arm moves proximally with the drive member, the elastic arm avoids the guide portion by moving away from the drive member.
[0010] In one embodiment, the elastic arm is specifically a first slider, which is capable of elastic deformation, and the guide portion is a first guide groove that meshes with the first slider.
[0011] In one embodiment, the drive assembly further includes a locking member having at least one abutment portion along the length of the push rod; the locking member abuts the abutment portion to restrict the push rod from moving proximally, and the locking member avoids the abutment portion by moving away from the handle when the push rod moves toward the distal end of the sleeve.
[0012] In one embodiment, the locking element is specifically a second slider capable of elastic deformation, and the abutting portion is a second guide groove that engages with the second slider.
[0013] In one embodiment, the unlocking mechanism includes a pusher disposed on the handle, the pusher abutting against the drive assembly and used to push the drive assembly apart from the push rod to release the restriction mechanism.
[0014] In one embodiment, the handle includes a housing and a cover plate detachably disposed on the housing, the cover plate being switchable between an initial position and a push position relative to the housing in a detached state; the push member is disposed between the drive assembly and the cover plate, the push member being driven by the cover plate during the movement of the cover plate from the initial position to the push position, thereby pushing the drive assembly to separate from the push rod.
[0015] In one embodiment, the firing assembly further includes a lever extending from the handle into the cannula, the proximal end of the lever being connected to the drive assembly, and the distal end of the lever being provided with a paddle that is tilted distally to guide the distal implant into the distal end of the cannula during firing.
[0016] In one embodiment, the actuating lever and the firing lever are spaced apart, the implant is disposed between the actuating lever and the firing lever, and the distal end of the pusher extends between the actuating lever and the firing lever and abuts against the implant.
[0017] In one embodiment, the cannula includes a body and an end cap, the end cap being detachably connected to the distal end of the body, the distal end of the body having a loading port for loading the implant into the body.
[0018] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features, objects, and advantages of this application will become apparent from the specification, drawings, and claims. Attached Figure Description
[0019] To better describe and illustrate embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more accompanying drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed inventions, the currently described embodiments and / or examples, or the best mode of these inventions as currently understood.
[0020] Figure 1 is a schematic diagram of the structure of the repetitive loading and fixing device provided in the embodiment of this application.
[0021] Figure 2 is an exploded view of the reloading and fixing device.
[0022] Figure 3 is a schematic diagram of the connection between the connecting block and the firing assembly.
[0023] Figure 4 is a cross-sectional view of the connecting block, connecting frame, push rod, and push bracket.
[0024] Figure 5 is an exploded view of the reloaded fixed device.
[0025] Figure 6 is a cross-sectional view of the cannula, firing lever, trigger lever, and implant after the implant is loaded.
[0026] Figure 7 is a cross-sectional view of the cannula, firing lever, trigger lever, and implant during the first firing operation.
[0027] Figure 8 is a cross-sectional view of the cannula, firing lever, trigger lever, and implant after firing.
[0028] Figure 9 is a cross-sectional view of the cannula, firing lever, trigger lever, and implant during the firing operation when the implant is present at the distal end of the firing cannula.
[0029] Figure 10 is an exploded view of the reloaded fixed device.
[0030] Reference numerals: 1. Handle; 10. Outer shell; 100. First half-shell; 101. Second half-shell; 103. Opening; 105. Locking block; 11. Cover plate; 110. First locking screw; 111. Observation window; 112. First elastic element; 12. Tightening sleeve; 2. Sleeve; 20. Tube body; 200. Loading hole; 202. Slot; 21. End; 212. Implant observation hole; 213. Second locking screw; 3. Firing assembly; 30. Firing lever; 31. Push lever; 310. First guide groove; 311. Second guide groove; 32. Actuating lever; 320. Paddle; 321. Spring; 4. Drive assembly; 40. Drive component; 400. First slider; 401. First pin; 41. Connecting block; 410. Second slider; 411. First limiting slide; 412. Second limiting slide; 413. Rotating shaft; 5. Pushing component; 50. First pushing part; 51. Second pushing part; 6. Drive mechanism; 60. Gear; 61. Rack; 610. Second pin; 62. Connecting component; 620. First opening; 621. Second opening; 63. Operating handle; 630. Second elastic element; 7. Implant. Detailed Implementation
[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0032] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not 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 application. The term "proximal end" refers to the end of the repetitive loading and fixing device that is relatively close to the operator during use, and the term "distal end" refers to the end of the repetitive loading and fixing device that is relatively far from the operator during use.
[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0037] This embodiment provides a reusable fixation device, as shown in Figures 1, 2, 3, 4, and 6. The reusable fixation device includes a handle 1, a cannula 2, an implant 7, a firing assembly 3, a drive assembly 4, and an unlocking mechanism. The handle 1 has a proximal end and a distal end. As shown in Figure 1, arrow S points towards the proximal end, and arrow P points towards the distal end. The cannula 2 is located at the distal end of the handle 1, and the implant 7 is disposed within the cannula 2. In this embodiment, the implant 7 can be used to fix a biological patch to soft tissue. The firing assembly 3 includes a firing rod 30 and a push rod 31, which extend from the handle 1 into the cannula 2. The push rod 31 pushes the implant 7 distally, and the firing rod 30 fires the implant 7. The drive assembly 4 drives the push rod 31 distally and has a limiting mechanism that restricts the push rod 31 from moving proximally to the handle 1. The unlocking mechanism releases the limiting mechanism to allow the push rod 31 to move proximally to the handle 1.
[0038] The reloading and fixing device provided in this embodiment, by setting a drive assembly 4, can drive the push rod 31 to move distally in a single direction. Thus, in successive firing operations, the push rod 31 can be driven to move distally one by one to push the implants 7 one by one to the distal end of the cannula 2, and the firing rod 30 then fires the implants 7 located distally at the cannula 2. The unlocking mechanism can remove the restriction of the drive assembly 4 on the proximal movement of the push rod 31. Thus, after all the implants 7 placed in the cannula 2 have been fired, the unlocking mechanism can release the restriction, allowing the push rod 31 to move proximally to the handle 1. Therefore, the push rod 31 can eliminate the occupation of the internal space of the cannula 2 during firing by moving proximally, allowing the operator to reload the implants 7 into the cannula 2.
[0039] Referring to Figures 3 and 4, the drive assembly 4 includes a drive member 40 capable of reciprocating between the proximal and distal ends of the handle 1. The drive member 40 is provided with an elastic arm, and the push rod 31 is provided with a plurality of guide portions spaced apart along its length. When the elastic arm moves distally with the drive member 40, it abuts against the guide portions, driving the push rod 31 distally. When the elastic arm moves proximally with the drive member 40, it avoids the guide portions by moving relative to the drive member 40. Through the interaction between the elastic arm on the drive member 40 and the guide portions on the push rod 31, the drive member 40 can drive the push rod 31 distally during its movement distally, and the drive member 40 can avoid the guide portions during its movement proximally to prevent the push rod 31 from moving proximally. It is readily understood that in other alternative embodiments, the number of guide portions may also be one.
[0040] Specifically, in this embodiment, the elastic arm is a first slider 400, which is capable of elastic deformation, and the guide portion is a first guide groove 310 that meshes with the first slider 400. By setting the first slider 400 and the first guide groove 310 as the elastic arm and guide portion, respectively, the required function can be achieved, while also facilitating manufacturing and assembly. The meshing mentioned here means that the opening direction of the first guide groove 310 faces the proximal end, and the first guide groove 310 has a pressure-receiving surface facing the proximal end and a guide slope inclined relative to the pressure-receiving surface. After the first slider 400 is inserted into the first guide groove 310, the side surface of the end of the first slider 400 facing the distal end abuts against the pressure-receiving surface, while the side surface of the end of the first slider 400 fits against the guide slope. When the driving member 40 is subjected to external pressure and moves towards the distal end, the end of the first slider 400 presses against the pressure-receiving surface of the first guide groove 310, which can drive the push rod 31 to move towards the distal end. When the driving member 40 is subjected to external pressure and moves towards the proximal end, the end of the first slider 400 disengages from the pressure-bearing surface of the first guide groove 310. Simultaneously, due to the interaction between the end of the first slider 400 and the guide slope of the first guide groove 310, the first slider 400 deforms relative to the driving member 40 under the action of the guide slope, thereby separating the first slider 400 from the first guide groove 310. Afterwards, the driving member 40 continues to move towards the proximal end, and the first slider 400 follows the driving member 40 towards the proximal end until it is engaged in the next first guide groove 310.
[0041] Referring to Figures 3 and 4, the drive assembly 4 in this embodiment further includes a locking member, with multiple spaced-apart abutments arranged along the length of the push rod 31. The locking member abuts against the abutments to restrict the movement of the push rod 31 towards the proximal end of the handle 1, and the locking member avoids the abutments by moving away from the handle 1 when the push rod 31 moves towards the distal end of the sleeve 2. By cooperating with the abutments on the push rod 31, the locking member can restrict the movement of the push rod 31 towards the proximal end, while simultaneously avoiding the abutments during the movement of the push rod 31 towards the distal end to prevent obstruction of the push rod 31's movement towards the distal end. It is readily understood that in other alternative embodiments, the number of abutments may also be set to one.
[0042] Specifically, in this embodiment, the locking element is a second slider 410 capable of elastic deformation, and the abutment part is a second guide groove 311 that engages with the second slider 410. By setting the second slider 410 and the second guide groove 311 as the locking element and the abutment part respectively, the required function can be achieved, while also facilitating manufacturing and assembly. The engagement described here means that the opening direction of the second guide groove 311 faces the proximal end, and the second guide groove 311 has a pressure-bearing surface facing the proximal end and a guide slope inclined relative to the pressure-bearing surface. After the second slider 410 is inserted into the second guide groove 311, the distal end surface of the second slider 410 abuts against the pressure-bearing surface, while the side surface of the end of the second slider 410 fits against the guide slope. When the push rod 31 moves toward the distal end under the drive of the drive member 40, the side of the second slider 410 interacts with the guide slope of the second guide groove 311. Under the pressure of the guide slope, the second slider 410 deforms relative to the handle 1, and then the second slider 410 disengages from the second guide groove 311 until the push rod 31 moves forward so that the next second guide groove 311 aligns with the second slider 410, and the second slider 410 is engaged in the next second guide groove 311. When the drive member 40 moves toward the proximal end, the first slider 400 interacts with the push rod 31, but the end of the second slider 410 abuts against the pressure surface of the second guide groove 311, preventing the push rod 31 from moving toward the proximal end.
[0043] Along the length of the push rod 31, the first guide groove 310 and the second guide groove 311 in this embodiment are located on both sides of the push rod 31, respectively. The distance between two adjacent first guide grooves 310 is not less than the length of the implant 7, and similarly, the distance between two adjacent second guide grooves 311 is not less than the length of the implant 7.
[0044] In this embodiment, the engagement between the first guide groove 310 and the first slider 400, and the engagement between the second guide groove 311 and the second slider 410, also have the following effects: During operation, after each firing operation, the first guide groove 310 and the first slider 400 can generate a prompt sound through the deformation of the first slider 400. Similarly, the second guide groove 311 and the second slider 410 can also generate a prompt sound through the deformation of the second slider 410. The prompt sound can remind the operator that the firing operation was successful and can ensure that the second slider 410 is engaged in the second guide groove 311, ensuring that the push rod 31 cannot retract.
[0045] Furthermore, referring to Figures 4 and 5, the unlocking mechanism in this embodiment includes a pusher 5 disposed on the handle 1. The pusher 5 abuts against the drive assembly 4 and is used to push the drive assembly 4 away from the push rod 31 to release the restriction mechanism. By providing the pusher 5, the drive assembly 4 can be pushed to separate from the push rod 31, so that the push rod 31 can move proximally. Specifically, the pusher 5 has a first push part 50 and a second push part 51. The first push part 50 is used to push the first slider 400, and the second push part 51 is used to push the second slider 410. An external force applied to the pusher 5 can drive the pusher 5 to move distally. During the movement, the pusher 5 can apply pressure to the first slider 400 and the second slider 410 through the first push part 50 and the second push part 51, respectively. The first slider 400 and the second slider 410 deform under the pressure of the pusher 5 and disengage from the first guide groove 310 and the second guide groove 311 through deformation. In this way, the push rod 31 can move proximally, making it easier to reload the implant 7 into the cannula 2.
[0046] Furthermore, in this embodiment, the handle 1 includes a housing 10 and a cover plate 11 detachably disposed on the housing 10. In the detached state, the cover plate 11 can switch between an initial position and a pushing position relative to the housing 10. A pushing member 5 is disposed between the driving assembly 4 and the cover plate 11. During the sliding process of the cover plate 11 from the initial position to the pushing position, the pushing member 5 is driven by the cover plate 11 to push the driving assembly 4 away from the push rod 31. The detachable cover plate 11 facilitates operation from outside the handle 1 by the operator. Pushing the cover plate 11 drives the pushing member 5 to push the driving assembly 4 away from the push rod 31. In this embodiment, a first elastic member 112 is also provided between the cover plate 11 and the housing 10. Specifically, the first elastic member 112 is a compression spring, one end of which abuts against the cover plate 11, applying pressure to the cover plate 11 to give it a tendency to move towards the initial position. Thus, after the implant 7 is loaded, the operator can release the pressure on the cover plate 11. Under the elastic force of the first elastic member 112, the cover plate 11 can drive the pusher 5 to move proximally back to its original position. At the same time, after the pressure of the pusher 5 is removed, the first slider 400 and the second slider 410 respectively deform and engage in the first guide groove 310 and the second guide groove 311.
[0047] More specifically, referring to Figures 2, 5, and 10, the outer shell 10 in this embodiment includes a first half-shell 100 and a second half-shell 101, which are locked together. The outer shell 10 has an opening 103, which has a slide rail that slides with the cover plate 11. The cover plate 11 is detachably connected to the opening 103, and the pusher is snapped into position on the cover plate 11. In this embodiment, the cover plate 11 is locked to the first half-shell 100 by a first locking screw 110. After releasing the lock between the cover plate 11 and the first half-shell 100, the cover plate 11 can be pushed from the outside along the slide rail, thereby driving the pusher 5 to move and push the first slider 400 and the second slider 410 respectively through the first pusher part 50 and the second pusher part 51, causing the first slider 400 and the second slider 410 to deform and disengage from the first guide groove 310 and the second guide groove 311.
[0048] Exemplarily, this embodiment also includes an observation window 111 on the cover plate 11 for observing the advancing position of the push rod 31. The observation window 111 facilitates the operator's observation of the advancing position of the push rod 31, thereby helping the operator determine the number of remaining implants 7. Specifically, this embodiment also includes an indicator on the push rod 31 that represents the remaining implants 7 within the cannula 2. After each firing operation, one implant 7 is ejected, and correspondingly, the push rod 31 advances once by a distance L. The aforementioned indicators are arranged at intervals of L. Thus, after one firing operation, the number of remaining implants 7 can be viewed through the observation window 111.
[0049] Referring to Figures 2 and 6, the firing assembly 3 in this embodiment also includes a lever 32 extending from the handle 1 into the cannula 2. The proximal end of the lever 32 is connected to the drive assembly 4, and the distal end of the lever 32 is provided with a paddle 320. The paddle 320 is tilted forward toward the distal end of the firing lever 30 and is used to guide the implant 7 located at the distal end into the distal end of the cannula 2 during firing. By providing the lever 32, the paddle 320 on the lever 32 can guide the implant 7 into the distal end of the cannula 2, which can improve the accuracy of switching the position of the implant 7 to the distal end of the cannula 2 and avoid jamming during firing.
[0050] Specifically, in this embodiment, the toggle lever 32 is fixedly connected to the drive member 40 through its proximal end, thereby the toggle lever 32 can move synchronously with the drive member 40.
[0051] Furthermore, in this embodiment, the actuating lever 32 and the firing lever 30 are spaced apart, the implant 7 is disposed between the actuating lever 32 and the firing lever 30, and the distal end of the pusher 31 extends between the actuating lever 32 and the firing lever 30 and abuts against the implant 7. By setting the relative positions of the actuating lever 32 and the firing lever 30, the assembly operation of the firing assembly 3 and the drive assembly 4 can be facilitated. In this embodiment, a spring piece 321 is also provided on the surface of the actuating lever 32 opposite to the firing lever 30. The spring piece 321 extends from the actuating lever 32 toward the inner wall of the sleeve 2 and abuts against the inner wall of the sleeve 2. By setting a spring piece 321 that abuts against the inner wall of the sleeve 2, a certain clamping force can be applied to the actuating rod 32, the push rod 31 and the firing rod 30, thereby increasing the stability of the movement of the actuating rod 32, the push rod 31 and the firing rod 30 during firing and preventing the actuating rod 32, the push rod 31 and the firing rod 30 from shaking during movement.
[0052] In this embodiment, the cannula 2 includes a tube body 20 and an end 21. The end 21 is detachably connected to the distal end of the tube body 20. The distal end of the tube body 20 has a loading hole 200 for loading the implant 7 into the tube body 20. With the above structural design, when it is necessary to load the implant 7, the end 21 can be detached from the tube body 20 for assembly. Specifically, as shown in FIG10, in this embodiment, the end 21 is sleeved on the distal end of the tube body 20, and then a second locking screw 213 is used to lock and fix the end 21 to the tube body 20. In addition, a slot 202 is provided at the proximal end of the tube body 20, and the outer shell 10 has a tubular connecting section that cooperates with the tube body 20. During the process of the first half shell 100 and the second half shell 101 being fastened together, the connecting section can be sleeved on the outside of the tube body 20. Simultaneously, a locking block 105 is provided inside the connecting section to cooperate with the locking slot 202. The locking block 105 is inserted into the locking slot 202 to install the tube body 20 onto the handle 1. In this embodiment, a screw-on sleeve 12 is also used to tighten the thread to the outside of the connecting section to further fix the tube body 20 to the handle 1. In other optional embodiments, threaded connection, screw fastening connection, snap-fit, etc., can also be used to fix and install the tube body 20 to the end 21 and the handle 1.
[0053] For example, in this embodiment, an implant observation hole 212 is also provided at the end 21, through which it can be seen whether there is an implant 7 to be fired at the distal end of the tube.
[0054] It is readily understood that the repetitive loading and fixing device provided in this embodiment also includes a drive mechanism 6 for driving the drive member 40 and the firing lever 30. Referring to Figures 2, 5, 6, and 10, the drive mechanism 6 includes a trigger, a gear 60, a rack 61, a connecting member 62, and a second elastic member 630. The trigger is an operating handle 63 that swings relative to the housing 10, having an initial position and a firing position. During the movement of the operating handle 63 from the initial position to the firing position, the operating handle 63 drives the gear 60, which is fixedly connected to the operating handle 63, to rotate. The gear 60 then drives the rack 61, which meshes with the gear 60, to move. The proximal end of the firing lever 30 is fixedly connected to the rack 61. In this embodiment, a connecting block 41 is also connected inside the handle 1. The aforementioned second slider 410 is provided with the connecting block 41, which also forms a first limiting slide 411 and a second limiting slide 412. Connector 62 rotatably mounts connecting block 41 via pivot 413. Connector 62 has a first opening 620 and a second opening 621. Rack 61 is fixedly mounted with a first pin 401 inserted into the first opening 620. Driver 40 is mounted with a second pin 610 inserted into the second opening 621. The first pin 401 is rotatable and movable relative to the first opening 620, and the second pin 610 is rotatable and movable relative to the second opening 621. That is, the size of the first opening 620 is larger than the outer diameter of the first pin 401, and the size of the second opening 621 is larger than the outer diameter of the second pin 610. In this embodiment, both the first pin 401 and the second pin 610 are round shafts, and both the first opening 620 and the second opening 621 are oblong holes. Driver 40 is slidably mounted in the first limiting slide 411, and the firing lever 30, the actuating lever 32, the pushing lever 31, and the rack 61 are all slidably mounted in the second limiting slide 412.
[0055] The second elastic element 630 is disposed between the operating handle 63 and the housing 10, and the second elastic element 630 applies pressure to the operating handle 63 such that the operating handle 63 tends to move back to its initial position. Thus, after the firing operation is completed, the operator releases the force on the operating handle 63, and the operating handle 63 can swing back to its initial position under the pressure of the second elastic element 630, while simultaneously driving the gear 60 and rack 61 to move, and causing the firing lever 30 and the trigger lever 32 in the firing assembly 3 to move proximally to reset.
[0056] With the above structural design, the operator can drive the rack 61 to reciprocate between the proximal and distal ends of the handle 1 by operating the handle 63. The rack 61 can directly drive the firing lever 30 to move synchronously. In addition, the rack 61 can drive the drive member 40 to move through the connector 62. The drive member 40 can drive the lever 32 fixed to it to move synchronously. At the same time, the drive member 40 can drive the pusher lever 31 to move to the distal end through the first slider 400.
[0057] Furthermore, the first pin 401, the second pin 610, and the rotating shaft 413 are arranged parallel and spaced apart, and the distance between the first pin 401 and the rotating shaft 413 is greater than the distance between the second pin 610 and the rotating shaft 413. This allows the movement speed of the actuating lever 32 to be slower than that of the firing lever 30. In this embodiment, by designing the firing lever 30 and the actuating lever 32 to move at a differential speed, the implant 7 can more accurately switch positions (from the firing lever 30 and the actuating lever 32 to the distal end of the cannula 2).
[0058] It is readily understood that, in other alternative embodiments, the operating handle 63 may also be designed to switch between a first position and a second position via a linear motion. Alternatively, other structural forms of the drive mechanism 6 may be used to drive the firing assembly 3, referring to existing technologies.
[0059] The firing operation process of the repetitive loading fixing device is described below with reference to Figures 6, 7, 8, 9 and 10:
[0060] This embodiment uses the simultaneous loading of ten implants 7 as an example. As shown in Figure 6, immediately after loading the implants 7, all ten implants 7 are located inside the cannula 2 and between the firing lever 30 and the actuating lever 32. As shown in Figure 7, the operator performs the firing operation, pulling the operating handle 63 to move the firing lever 30, the push lever 31, and the actuating lever 32 distally. During this process, the push lever 31 pushes all ten implants 7 forward. After the firing operation is completed, the firing lever 30 and the actuating lever 32 are moved proximally to reset under the elastic force of the second elastic element 630. As shown in Figure 8, due to the differential movement of the firing lever 30 and the actuating lever 32, and the actuating lever 320 provided with a paddle, the distal implant 7 located between the firing lever 30 and the actuating lever 32 easily falls into the distal end of the cannula 2. Subsequently, with the implant 7 at the tip of the firing lever 30, the firing operation is performed again. As shown in Figure 9, the operator pulls the operating handle 63, causing the firing lever 30, push lever 31, and actuating lever 32 to move distally. The firing lever 30 pushes the implant 7, thus firing the implant 7 out of the cannula 2. After the firing operation is completed, the second elastic element 630 causes the firing lever 30 and actuating lever 32 to move proximally to reset, and the reloading and fixation device returns to the state shown in Figure 8. The operator can then continuously perform firing operations until the implant 7 is completely ejected.
[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0062] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A repetitive loading and fixing device, characterized in that, include: The handle has a proximal end and a distal end; A sleeve is provided at the distal end of the handle; An implant is placed inside the cannula; A firing assembly includes a firing lever and a pusher lever, the firing lever and the pusher lever extending from the handle into the cannula, the pusher lever pushing the implant distally, and the firing lever firing the implant located at the distal end; A drive assembly for driving the push rod to a distal end and having a limiting mechanism to restrict movement of the push rod to the proximal end of the handle, and, An unlocking mechanism is provided to release the restrictive mechanism so that the push rod can move toward the proximal end of the handle.
2. The repetitive loading and fixing device as described in claim 1, wherein, The drive assembly includes a drive member capable of reciprocating between the proximal and distal ends of the handle, the drive member being provided with an elastic arm, and the push rod being provided with at least one guide portion along its length. When the elastic arm moves distally with the driving member, the elastic arm abuts against the guide portion to drive the push rod to move distally. As the elastic arm moves proximally with the drive member, it avoids the guide portion by moving away from the drive member.
3. The repetitive loading and fixing device as described in claim 2, wherein, The elastic arm is specifically a first slider, which is capable of elastic deformation, and the guide portion is a first guide groove that meshes with the first slider.
4. The reusable loading and fixing device as described in any one of claims 1 to 3, wherein, The drive assembly also includes a locking element, and at least one abutting part is provided along the length direction of the push rod; The locking member abuts against the abutment portion to restrict the push rod from moving proximally, and the locking member avoids the abutment portion by moving away from the handle as the push rod moves toward the distal end of the sleeve.
5. The reusable loading and fixing device as described in claim 4, wherein, The locking element is specifically a second slider capable of elastic deformation, and the abutting part is a second guide groove that engages with the second slider.
6. The repetitive loading and fixing device as described in claim 1, wherein, The unlocking mechanism includes a pusher disposed on the handle, the pusher abutting against the drive assembly and used to push the drive assembly apart from the push rod to release the restriction mechanism.
7. The reusable loading and fixing device as described in claim 6, wherein, The handle includes a housing and a cover plate detachably disposed on the housing, the cover plate being switchable between an initial position and a push position relative to the housing in a detached state; The pusher is disposed between the drive assembly and the cover plate. As the cover plate moves from the initial position to the push position, the pusher is driven by the cover plate to push the drive assembly and the push rod apart.
8. The repetitive loading and fixing device as described in claim 1, wherein, The firing assembly also includes a lever extending from the handle into the cannula, the proximal end of the lever being connected to the drive assembly, and the distal end of the lever being provided with a paddle that is tilted distally to guide the implant located distally into the distal end of the cannula during firing.
9. The reusable loading and fixing device as described in claim 8, wherein, The actuating lever and the firing lever are spaced apart, the implant is disposed between the actuating lever and the firing lever, and the distal end of the pusher extends into the space between the actuating lever and the firing lever and abuts against the implant.
10. The repetitive loading and fixing device as claimed in claim 1, wherein, The cannula includes a tube body and an end cap, the end cap being detachably connected to the distal end of the tube body, the distal end of the tube body having a loading port for loading the implant into the tube body.