Flexible injection needle with a dosing injection device

Abstract

The present application relates to the technical field of bendable injection needle, and discloses a bendable injection needle with a quantitative injection device, which comprises an injection mechanism, a quantitative injection mechanism and a fixed handle. The quantitative injection mechanism comprises a quantitative component, a back-movement prevention component and a uniform speed resetting component. The quantitative component can accurately control the preset injection dose, avoiding the dose deviation problem in manual injection. The back-movement prevention component can effectively prevent the back movement of the piston during the injection process. The uniform speed resetting component and the back-movement prevention component work together to automatically reset the piston after the back-movement prevention function is released.

Description

Technical Field

[0001] This invention relates to the technical field of flexible injection needles, and more particularly to a flexible injection needle with a metering injection device. Background Technology

[0002] A flexible injection needle is an innovative injection device made of flexible materials (such as medical-grade polymers and superelastic nickel-titanium alloys). While maintaining a hollow, unobstructed structure to deliver medication, the needle body can bend controllably under pressure and partially return to its original shape after the force is removed. The core design purpose is to bypass the tortuous paths of bones, organs, tissues, nerves, or blood vessels in minimally invasive interventional treatments, precisely reaching target points that rigid straight needles cannot reach, thereby reducing tissue damage, lowering the difficulty of puncture, and improving patient comfort. In clinical injection therapy, precise dosage is crucial for ensuring treatment effectiveness, and flexible injection needles can adapt to the injection needs of different sites, reducing injection damage, and are therefore widely used in various medical scenarios.

[0003] Existing flexible injection needles with quantitative injection devices still have technical defects: First, the quantitative mechanism is poorly designed, often using simple scale adjustment methods, resulting in low quantitative accuracy. Furthermore, the needles are prone to loosening after adjustment, leading to dosage deviations and failing to meet the needs of precise clinical injection. Second, they lack a reliable anti-reverse displacement structure, making it easy for the piston to shift back during injection due to external force or the reaction force of the medication, resulting in insufficient dosage and affecting treatment efficacy. Third, the reset structure is poorly designed, often requiring manual reset, which is physically demanding and the speed cannot be controlled during reset, easily causing the piston to collide violently with the inner wall of the syringe, damaging the device or leaving medication residue. Summary of the Invention

[0004] In view of the problems existing with the flexible injection needle with a quantitative injection device, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a flexible injection needle with a quantitative injection device.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: including, An injection mechanism includes an injection syringe, a flexible needle disposed at the end of the injection syringe, a retaining ring sleeved on the surface of the injection syringe, a retaining handle fixed to the bottom of the retaining ring, a piston disposed inside the injection syringe, a push-pull rod fixed to the surface of the piston, a connecting plate fixedly connected to the other end of the push-pull rod, and a handle fixed to the bottom of the connecting plate. A quantitative injection mechanism includes a quantitative component for quantitative injection, an anti-reverse component used in conjunction with the quantitative component to prevent the piston from reversing, and a uniform speed reset component used in conjunction with the anti-reverse component to dampen and uniformly spring back the piston. When the anti-rebound function of the anti-reverse component is deactivated, the uniform speed reset component can automatically dampen and reset the piston.

[0007] As a preferred embodiment of the flexible injection needle with a quantitative injection device according to the present invention, the quantitative component includes an asymmetrical C-shaped toothed plate fixedly connected to a piston at its end, a mounting bracket fixed to the top of the surface of a fixing ring, a rotating shaft rotatably mounted inside the mounting bracket, a gear fixed to the surface of the rotating shaft and meshing with the asymmetrical C-shaped toothed plate, follower rods respectively fixed to the end of the rotating shaft, a circular box fixed to the surface of the mounting bracket, a rotating cover rotatably mounted inside the circular box, a stop bar fixed to the inside of the rotating cover and used to limit the rotation angle of the follower rod, and a knob plate fixed to the surface of the rotating cover. The follower rod rotates inside the circular box, and the stop rod is used to block the follower rod.

[0008] As a preferred embodiment of the flexible injection needle with a quantitative injection device according to the present invention, the quantitative component further includes a locking element for locking the rotating cap and the stop bar; The locking component includes a slot inside the knob plate, a compression spring fixed inside the slot, a lever fixed to the other end of the compression spring, a connecting slot on the surface of the knob plate and communicating with the slot, and a paddle fixed to the surface of the lever and passing through the connecting slot. A protruding ring is fixedly installed on the surface of the circular box. The surface of the protruding ring has several locking grooves for the matching locking rods. The paddle is used to move the locking rods so that the ends of the locking rods can disengage from the inside of the locking grooves.

[0009] As a preferred embodiment of the flexible injection needle with quantitative injection device of the present invention, wherein: an annular groove is provided on the inner wall of the circular box, and an annular strip is fixedly installed on the surface of the rotating cover, and the annular strip is adapted to be engaged with the annular groove.

[0010] As a preferred embodiment of the flexible injection needle with quantitative injection device of the present invention, the anti-retrograde component includes a plurality of anti-retrograde ratchet teeth fixed to the bottom of the asymmetrical C-shaped toothed plate, a movable hinge fixed to the top of the surface of the injection syringe, and a pawl that is rotatably mounted inside the movable hinge by a torsion spring and adapted to the anti-retrograde ratchet teeth.

[0011] As a preferred embodiment of the flexible injection needle with quantitative injection device of the present invention, a base plate is fixedly installed on one side of the movable hinge, a first magnetic block is embedded in the top of the base plate, and a second magnetic block is embedded in the surface of the pawl to cooperate with the first magnetic block. The first and second magnetic blocks work together to limit the pawl, keeping it out of the anti-return ratchet teeth, thus facilitating the piston's return and reset.

[0012] As a preferred embodiment of the flexible injection needle with quantitative injection device of the present invention, a support block is fixedly installed on the top of the injection syringe and between the mounting brackets, a storage groove is provided on the top of the support block, the asymmetrical C-shaped toothed plate passes through the storage groove, and an anti-interference groove adapted to the movement of the anti-return ratchet is provided at the bottom of the storage groove. The support block and the storage groove work together to provide limiting support for the asymmetrical C-shaped toothed plate.

[0013] As a preferred embodiment of the flexible injection needle with quantitative injection device of the present invention, the uniform speed reset component includes two guide rings symmetrically fixed to the surface of the fixed ring, a guide rod fixed to one side of the connecting plate and adapted to the guide rings, a reset spring fixed between the guide rings and the connecting plate for piston reset, a friction plate embedded on the top of the surface of the guide rod, and a damping component disposed on the guide ring and used in conjunction with the friction plate. The end of the guide ring penetrates the interior of the guide rod.

[0014] As a preferred embodiment of the flexible injection needle with quantitative injection device of the present invention, the damping component includes a horizontal plate disposed above the guide ring, a vertical rod fixed to the top of the guide ring and passing through the horizontal plate, a circular plate fixed to the top of the vertical rod, a compression spring fixed between the horizontal plate and the circular plate, two connecting rods symmetrically fixed to the bottom of the horizontal plate, and a friction block fixed to the bottom of the connecting rod and used in conjunction with the friction plate.

[0015] As a preferred embodiment of the flexible injection needle with quantitative injection device of the present invention, the top of the guide ring surface is provided with a square groove adapted for use with the friction block, and the surface of the horizontal plate is provided with a round hole adapted for use with the vertical rod.

[0016] The beneficial effects of this invention are as follows: the quantitative injection mechanism can accurately control the preset injection dose, avoiding the problem of dose deviation during manual injection; the anti-backflow component can effectively prevent the piston from shifting back during injection, ensuring accurate injection of the set dose and guaranteeing the injection effect; the uniform speed reset component works in conjunction with the anti-backflow component, and can realize automatic damped reset of the piston after the anti-backflow function is released, eliminating the need for manual reset, reducing the intensity of operation, and at the same time, the damped reset design can avoid device damage or drug residue caused by excessive speed during reset, further improving the practicality and service life of the device, taking into account quantitative accuracy, ease of operation and safety of use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of the injection syringe of the present invention.

[0019] Figure 3 This is a schematic diagram of the piston and metering component structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the quantitative component structure of the present invention.

[0021] Figure 5 This is a schematic diagram of the locking component structure of the present invention.

[0022] Figure 6 This is a schematic diagram of the anti-reverse displacement component structure of the present invention.

[0023] Figure 7 This is a schematic diagram of the support block structure of the present invention.

[0024] Figure 8 This is a schematic diagram of the uniform speed reset component of the present invention.

[0025] Figure 9 This is a schematic diagram of the damping component structure of the present invention.

[0026] In the diagram: 100, Injection mechanism; 110, Syringe; 120, Needle; 130, Retaining ring; 140, Retaining handle; 150, Piston; 160, Push-pull rod; 170, Connecting plate; 180, Handle; 200, Metering injection mechanism; 210, Metering component; 211, Asymmetrical C-shaped toothed plate; 212, Mounting bracket; 213, Circular box; 214, Gear; 215, Follower rod; 216, Rotating cover; 217, Stop bar; 218, Knob plate; 219, Locking element; 2191, Empty slot; 2192, Compression spring; 2193, Locking lever; 2194, Connecting slot; 2195, Toggle. 2110, convex ring; 2111, locking groove; 2112, support block; 2113, storage groove; 2114, anti-interference groove; 220, anti-return component; 221, anti-return ratchet; 222, movable hinge; 223, pawl; 224, base plate; 225, first magnetic block; 226, second magnetic block; 230, uniform speed reset component; 231, guide ring; 232, guide rod; 233, reset spring; 234, friction plate; 235, damping component; 2351, horizontal plate; 2352, vertical rod; 2353, compression spring; 2354, connecting rod; 2355, friction block; 2356, square groove. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0030] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0031] Example 1 Reference Figure 1-7As a first embodiment of the present invention, a flexible injection needle with a quantitative injection device is provided, the device comprising: The injection mechanism 100 includes an injection syringe 110, a flexible needle 120 disposed at the end of the injection syringe 110, a retaining ring 130 sleeved on the surface of the injection syringe 110, a retaining handle 140 fixed to the bottom of the retaining ring 130, a piston 150 disposed inside the injection syringe 110, a push-pull rod 160 fixed to the surface of the piston 150, a connecting plate 170 fixedly connected to the other end of the push-pull rod 160, and a handle 180 fixed to the bottom of the connecting plate 170. It should be noted that, in addition to the commonly available rigid needles, the needle 120 can also be a shape-adjustable angle-locking puncture needle. The needle 120 is made entirely of rigid or semi-rigid materials, possessing basic rigid puncture capability. The head of the needle 120 adopts a flexible, bendable structure, allowing for multi-angle flexible bending adjustment, similar to the head of a ureteroscope. A shaping traction wire can be inserted inside the needle 120, referencing the shaping principle of pig tail nephrostomy tube wires. One end of the traction wire is fixed to the flexible head of the needle 120, and the other end extends to the control end at the tail of the needle 120. The traction wire can be adjusted by pulling or releasing the traction wire. The guide wire enables the active bending and straightening of the needle head 120. The needle head 120 is equipped with an angle fixing device. When the needle head 120 is bent and adjusted to the required puncture angle, the guide wire can be locked and positioned by the angle fixing device, so that the needle head 120 is stably fixed at the current bending angle and cannot spring back to its original position. This can adapt to different depths and angles of human tissue puncture, avoiding the problems of limited puncture angle and large tissue damage caused by traditional straight needles. At the same time, the rigid / semi-rigid structure of the needle body can ensure puncture rigidity, taking into account both puncture stability and access flexibility.

[0032] The quantitative injection mechanism 200 includes a quantitative component 210 for quantitative injection, an anti-reverse component 220 used in conjunction with the quantitative component 210 to prevent the piston 150 from reversing, and a uniform speed reset component 230 used in conjunction with the anti-reverse component 220 to dampen and uniformly spring back the piston 150 to reset. When the anti-rebound function of the anti-reverse component 220 is deactivated, the uniform speed reset component 230 can automatically dampen and reset the piston 150.

[0033] Among them, the quantitative injection mechanism 200 includes a quantitative component 210 that can accurately control the preset injection dose, avoiding the problem of dose deviation during manual injection; an anti-backward component 220 that can effectively prevent the piston 150 from shifting back during injection, ensuring accurate injection of the set dose and guaranteeing the injection effect; and a uniform speed reset component 230 that works in conjunction with the anti-backward component 220 that can automatically dampen and reset the piston 150 after the anti-backward function is released, eliminating the need for manual reset, reducing operational intensity. At the same time, the damping reset design can prevent device damage or drug residue caused by excessive speed during reset, further improving the practicality and service life of the device, and taking into account quantitative accuracy, ease of operation and safety of use.

[0034] Specifically, the metering component 210 includes an asymmetrical C-shaped toothed plate 211 fixedly connected to the piston 150 at its end, a mounting bracket 212 fixed to the top of the surface of the fixing ring 130, a rotating shaft rotatably mounted inside the mounting bracket 212, a gear 214 fixed to the surface of the rotating shaft and meshing with the asymmetrical C-shaped toothed plate 211, a follower rod 215 fixed to the end of the rotating shaft, a circular box 213 fixed to the surface of the mounting bracket 212, a rotating cover 216 rotatably mounted inside the circular box 213, a stop rod 217 fixed inside the rotating cover 216 and used to limit the rotation angle of the follower rod 215, and a knob plate 218 fixed to the surface of the rotating cover 216. The follower rod 215 rotates inside the circular box 213, and the stop rod 217 is used to block the follower rod 215.

[0035] The asymmetrical C-shaped toothed plate 211 is fixedly connected to the piston 150 and can synchronously follow the piston 150 in reciprocating motion. Its asymmetrical structural design can effectively avoid interference with other components of the device, ensuring smooth movement. The mounting bracket 212 provides stable mounting support for the rotating shaft and gear 214, ensuring stable meshing between the gear 214 and the asymmetrical C-shaped toothed plate 211. Through the meshing transmission of the gear and rack, the rotational motion is converted into linear motion, realizing precise control of the piston 150 stroke, and thus achieving quantitative adjustment of the injection dose. The follower rod 215 is fixedly connected to the rotating shaft and can synchronously follow the rotation of the gear 214. The circular box 213 provides a closed installation space for the follower rod 215 and the rotating cover 216, preventing external dust and impurities from entering and affecting the movement accuracy of the components. The stop bar 217 on the inner side of the rotating cover 216 can effectively limit the rotation angle of the follower rod 215, thereby limiting the rotation angle of the gear 214 and the travel of the asymmetrical C-shaped toothed plate 211, so as to achieve precise preset of the injection dose. The knob plate 218 makes it easy for the operator to rotate the rotating cover 216 to adjust the dose. The overall structure achieves quantitative control through mechanical transmission. The transmission is stable, highly accurate, and simple to operate, which can effectively meet the clinical quantitative injection needs.

[0036] Furthermore, the metering component 210 also includes a locking element 219 for locking the rotating cover 216 and the stop lever 217; The locking member 219 includes a slot 2191 formed inside the knob plate 218, a compression spring 2192 fixed inside the slot 2191, a lever 2193 fixed to the other end of the compression spring 2192, a connecting slot 2194 formed on the surface of the knob plate 218 and communicating with the slot 2191, and a paddle 2195 fixed on the surface of the lever 2193 and passing through the connecting slot 2194. A protruding ring 2110 is fixedly installed on the surface of the circular box 213. The surface of the protruding ring 2110 is provided with a number of locking grooves 2111 for engaging the matching locking rods 2193. A lever 2195 is used to move the locking rods 2193 so that the end of the locking rods 2193 can disengage from the interior of the locking grooves 2111.

[0037] The slot 2191 provides a stable installation space for the compression spring 2192 and the locking lever 2193. The compression spring 2192 can continuously apply an elastic force to the locking lever 2193, ensuring that the end of the locking lever 2193 can be stably locked in the locking groove 2111 on the surface of the convex ring 2110, thereby achieving reliable locking of the rotating cover 216 and the stop lever 217, preventing the rotating cover 216 from rotating due to external forces such as vibration and collision during the injection process, and thus ensuring the stability of the preset dose. The connecting slot 2194 provides a moving space for the lever 2195. The lever 2195 is fixedly connected to the locking lever 2193. The operator can move the locking lever 2193 by moving the lever 2195, so that the end of the locking lever 2193 is disengaged from the locking groove 2111, realizing the quick release of the locked state, which is convenient for subsequent dose adjustment. The locking is reliable and the unlocking is convenient, which not only ensures the accuracy of quantitative injection, but also improves the flexibility of operation.

[0038] Preferably, an annular groove is provided on the inner wall of the circular box 213, and an annular strip is fixedly installed on the surface of the rotating cover 216, and the annular strip is adapted to be snapped into the annular groove.

[0039] The matching snap-fit ​​between the ring bar and the ring groove can effectively limit and guide the rotating cover 216, ensuring that the rotating cover 216 rotates smoothly around the fixed axis inside the circular box 213, avoiding deviation or shaking during the rotation of the rotating cover 216, thereby ensuring the precise limitation of the rotation angle of the follower rod 215 by the stop rod 217, and ensuring the accuracy of quantitative adjustment.

[0040] Furthermore, the anti-retrograde component 220 includes several anti-retrograde ratchet teeth 221 fixed to the bottom of the asymmetrical C-shaped toothed plate 211, a movable hinge 222 fixed to the top of the surface of the syringe 110, and a pawl 223 rotatably mounted inside the movable hinge 222 by a torsion spring and adapted to use with the anti-retrograde ratchet teeth 221.

[0041] The anti-reverse ratchet 221 is fixed to the bottom of the asymmetrical C-shaped toothed plate 211 and can synchronously follow the reciprocating motion of the asymmetrical C-shaped toothed plate 211. The movable hinge 222 provides a stable rotational support for the pawl 223, and the torsion spring provides a continuous elastic force for the pawl 223, ensuring that the pawl 223 always remains in contact with the anti-reverse ratchet 221. During the injection process, when the piston 150 pushes the liquid to inject, the asymmetrical C-shaped toothed plate 211 drives the anti-reverse ratchet 221 to move forward. The pawl 223 rotates around the movable hinge 222 under the push of the anti-reverse ratchet 221, without affecting the injection operation. When the piston 150 tends to move back, the pawl 223, under the action of the torsion spring, engages between adjacent anti-reverse ratchet 221, effectively blocking the asymmetrical C-shaped toothed plate 211, thereby preventing the piston 150 from moving back and ensuring that the set dose of liquid can be fully injected. The structure is simple, the anti-reverse effect is reliable, and it meets the core requirements of quantitative injection.

[0042] Specifically, a base plate 224 is fixedly installed on one side of the movable hinge 222, a first magnetic block 225 is embedded in the top of the base plate 224, and a second magnetic block 226 is embedded on the surface of the pawl 223 to cooperate with the first magnetic block 225. The first magnetic block 225 and the second magnetic block 226 work together to limit the pawl 223, keeping the pawl 223 out of the anti-return ratchet 221, thereby facilitating the return and reset of the piston 150.

[0043] The base plate 224 is fixed to one side of the movable hinge 222, providing a stable mounting carrier for the first magnetic block 225. The first magnetic block 225 works in conjunction with the second magnetic block 226 on the surface of the pawl 223, and can use magnetic attraction to limit and fix the pawl 223. When it is necessary to deactivate the anti-reverse function and realize the piston 150's return and reset, the operator can rotate the pawl 223 to make the second magnetic block 226 and the first magnetic block 225 attract each other. At this time, the pawl 223 disengages from the anti-reverse ratchet 221 and no longer blocks the asymmetrical C-shaped tooth plate 211, making it easier for the piston 150 to return and reset under the action of the uniform speed reset component 230. When it is necessary to restore the anti-reverse function, simply rotate the pawl 223 in the opposite direction to disengage the second magnetic block 226 from the first magnetic block 225. The pawl 223 re-engages with the anti-reverse ratchet 221 under the action of the torsion spring. The operation is simple and convenient, effectively improving the flexibility and efficiency of the device.

[0044] Furthermore, a support block 2112 is fixedly installed on the top of the injection syringe 110 and between the mounting brackets 212. A storage groove 2113 is opened on the top of the support block 2112. An asymmetrical C-shaped toothed plate 211 passes through the storage groove 2113. An anti-interference groove 2114 adapted to the movement of the anti-return ratchet 221 is opened at the bottom of the storage groove 2113. The support block 2112 and the storage groove 2113 work together to limit and support the asymmetrical C-shaped toothed plate 211.

[0045] The support block 2112 is fixed to the top of the syringe 110 and located between the mounting brackets 212, providing stable support for the asymmetrical C-shaped toothed plate 211. This prevents the asymmetrical C-shaped toothed plate 211 from bending or shifting during reciprocating motion, ensuring stable meshing with the gear 214 and thus guaranteeing the accuracy of quantitative adjustment. The receiving groove 2113 is used to accommodate the asymmetrical C-shaped toothed plate 211 and guides its movement, further improving its smoothness. The anti-interference groove 2114 is located at the bottom of the receiving groove 2113, providing movement space for the anti-reverse ratchet 221 and preventing interference between the bottom of the receiving groove 2113 and the anti-reverse ratchet 221. This ensures smooth movement of both the asymmetrical C-shaped toothed plate 211 and the anti-reverse ratchet 221, while also protecting the anti-reverse ratchet 221 from collision damage. This combination of support, guidance, and anti-interference functions further enhances the stability and reliability of the device.

[0046] In use, the lever 2195 of the locking member 219 is moved, which drives the lever 2193 to compress the compression spring 2192, causing the end of the lever 2193 to disengage from the locking groove 2111 of the convex ring 2110, thus releasing the lock on the rotating cover 216; the knob plate 218 is rotated, which drives the rotating cover 216 and the stop bar 217 to rotate inside the circular box 213, rotating the lever 2193 to the preset corresponding locking groove 2111. Each locking groove 2111 corresponds to a different quantitative value, until the preset injection dose is adjusted; the lever 2195 is released, and the lever 2193 is engaged in the corresponding locking groove 2111 under the action of the compression spring 2192, locking the rotating cover 216 and the stop bar 217, thus completing the quantitative setting; The operator holds the fixed handle 140 and the grip 180, adjusts the bending angle of the flexible needle 120, and inserts the needle 120 into the preset injection site; slowly pushes the grip 180, which drives the push-pull rod 160 and piston 150 forward through the connecting plate 170, pushing the liquid into the needle 120; during the injection, the piston 150 drives the asymmetric C-shaped toothed plate 211 to move, the asymmetric C-shaped toothed plate 211 drives the gear 214 to rotate, the gear 214 then drives the rotating shaft and the follower rod 215. When the follower rod 215 rotates to the point where it is blocked by the stop rod 217, the movement of the piston 150 is hindered. At this time, a certain amount of solvent has been injected. At the same time, the pawl 223 of the anti-backflow component 220 is engaged with the anti-backflow ratchet 221 at the bottom of the asymmetric C-shaped toothed plate 211 under the action of the torsion spring, preventing the piston 150 from moving back and ensuring the accurate injection of the preset dose.

[0047] In summary, the quantitative injection mechanism 200's quantitative component 210 can accurately control the preset injection dose, avoiding the problem of dose deviation during manual injection; the anti-backflow component 220 can effectively prevent the piston 150 from shifting back during injection, ensuring the accurate injection of the set dose and guaranteeing the injection effect; it improves the practicality and service life of the device, taking into account quantitative accuracy, ease of operation and safety of use.

[0048] Example 2 Reference Figure 1 , Figure 2 , Figure 8 and Figure 9 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the uniform speed reset component 230 includes two guide rings 231 symmetrically fixed to the surface of the fixed ring 130, a guide rod 232 fixed to one side of the connecting plate 170 and adapted to the guide rings 231, a reset spring 233 fixed between the guide rings 231 and the connecting plate 170 for the reset of the piston 150, a friction plate 234 embedded in the top of the surface of the guide rod 232, and a damping component 235 disposed on the guide ring 231 and used in conjunction with the friction plate 234. The end of the guide ring 231 penetrates the interior of the guide rod 232.

[0049] Two symmetrically arranged guide rings 231, in conjunction with guide rods 232, precisely guide the reciprocating motion of connecting plate 170 and push-pull rod 160, preventing deviation or wobbling during movement and ensuring the piston 150 moves smoothly inside syringe 110, guaranteeing smooth injection and repositioning processes. The repositioning spring 233, fixed between guide rings 231 and connecting plate 170, is compressed and stores elastic potential energy during injection. When the anti-reverse function is released, the repositioning spring 233 releases this elastic potential energy, automatically repositioning connecting plate 170, push-pull rod 160, and piston 150, eliminating the need for manual operation and reducing operational intensity. Friction plate 234, in conjunction with damping element 235, generates uniform damping force during repositioning, effectively slowing down the repositioning speed and preventing violent collisions between piston 150 and the inner wall of syringe 110 due to excessive speed, which could damage the device or leave medication residue. This also ensures the smoothness of the repositioning process, further improving the device's practicality and lifespan.

[0050] Specifically, the damping component 235 includes a horizontal plate 2351 disposed above the guide ring 231, a vertical rod 2352 fixed to the top of the guide ring 231 and passing through the horizontal plate 2351, a circular plate fixed to the top of the vertical rod 2352, a compression spring 2353 fixed between the horizontal plate 2351 and the circular plate, two connecting rods 2354 symmetrically fixed to the bottom of the horizontal plate 2351, and a friction block 2355 fixed to the bottom of the connecting rods 2354 and used in conjunction with the friction plate 234.

[0051] The horizontal plate 2351 provides stable mounting support for the connecting rod 2354 and the friction block 2355. The guide rod 232 passes through the horizontal plate 2351 and is fixedly connected to the guide ring 231, which can guide the up and down movement of the horizontal plate 2351 and prevent the horizontal plate 2351 from deviating. The compression spring 2353 is fixed between the horizontal plate 2351 and the circular plate, which can continuously apply a downward elastic force to the horizontal plate 2351, ensuring that the friction block 2355 is always in close contact with the friction plate 234 on the surface of the guide rod 232, thereby generating a stable damping force and ensuring the uniformity of the reset process. The two symmetrically arranged connecting rods 2354 and friction blocks 2355 can make the damping force act evenly on the guide rod 232, avoiding the movement deviation of the guide rod 232 due to uneven damping force, and further improving the stability of the reset process.

[0052] Furthermore, the top of the guide ring 231 is provided with a square groove 2356 adapted to the friction block 2355, and the surface of the horizontal plate 2351 is provided with a round hole adapted to the vertical rod 2352.

[0053] The square groove 2356 is formed on the top surface of the guide ring 231 to accommodate the friction block 2355. It can guide and limit the up and down movement of the friction block 2355, avoid the friction block 2355 from deviating or shaking during its movement, ensure the stable fit between the friction block 2355 and the friction plate 234, and thus ensure the stability of the damping force.

[0054] During use, after injection, the pawl 223 of the anti-reverse component 220 is rotated, causing the second magnetic block 226 on the surface of the pawl 223 to attract the first magnetic block 225 on the base plate 224, thus releasing the anti-reverse function. At this time, the reset spring 233 of the uniform speed reset component 230 releases elastic potential energy, driving the connecting plate 170, push-pull rod 160 and piston 150 to move backward. The guide rod 232 moves smoothly along the guide ring 231, and the friction plate 234 and the friction block 2355 of the damping component 235 rub against each other to generate a uniform damping force, causing the piston 150 to reset to the initial position at a uniform speed. After the reset is completed, the pawl 223 is rotated in the opposite direction, causing the second magnetic block 226 to disengage from the first magnetic block 225. Under the action of the torsion spring, the pawl 223 re-engages with the anti-reverse ratchet 221, restoring the anti-reverse function.

[0055] In summary, the uniform speed reset component 230 and the anti-reverse displacement component 220 work together to achieve automatic damped reset of the piston 150 after the anti-reverse displacement function is released, eliminating the need for manual reset, reducing operational intensity. At the same time, the damped reset design can prevent device damage or liquid residue caused by excessive speed during the reset process.

[0056] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0057] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A flexible injection needle with a metering injection device, characterized in that: include, The injection mechanism (100) includes an injection syringe (110), a flexible needle (120) disposed at the end of the injection syringe (110), a retaining ring (130) sleeved on the surface of the injection syringe (110), a retaining handle (140) fixed to the bottom of the retaining ring (130), a piston (150) disposed inside the injection syringe (110), a push-pull rod (160) fixed to the surface of the piston (150), a connecting plate (170) fixedly connected to the other end of the push-pull rod (160), and a handle (180) fixed to the bottom of the connecting plate (170). The quantitative injection mechanism (200) includes a quantitative component (210) for quantitative injection, an anti-reverse component (220) used in conjunction with the quantitative component (210) to prevent the piston (150) from reversing, and a uniform speed reset component (230) used in conjunction with the anti-reverse component (220) to dampen and uniformly spring back the piston (150) to reset. When the anti-rebound function of the anti-reverse component (220) is deactivated, the uniform speed reset component (230) can automatically dampen and reset the piston (150).

2. The flexible injection needle with a metering injection device according to claim 1, characterized in that: The metering component (210) includes an asymmetrical C-shaped toothed plate (211) whose end is fixedly connected to the piston (150), a mounting bracket (212) fixed to the top of the surface of the fixing ring (130), a rotating shaft rotatably mounted inside the mounting bracket (212), a gear (214) fixed to the surface of the rotating shaft and meshing with the asymmetrical C-shaped toothed plate (211), a follower rod (215) fixed to the end of the rotating shaft, a circular box (213) fixed to the surface of the mounting bracket (212), a rotating cover (216) rotatably mounted inside the circular box (213), a stop rod (217) fixed inside the rotating cover (216) and used to limit the rotation angle of the follower rod (215), and a knob plate (218) fixed to the surface of the rotating cover (216). The follower rod (215) rotates inside the circular box (213), and the stop rod (217) is used to block the follower rod (215).

3. The flexible injection needle with a metering injection device according to claim 2, characterized in that: The metering component (210) also includes a locking element (219) for locking the rotating cover (216) and the stop (217). The locking member (219) includes a slot (2191) opened inside the knob plate (218), a compression spring (2192) fixed inside the slot (2191), a lever (2193) fixed to the other end of the compression spring (2192), a connecting slot (2194) opened on the surface of the knob plate (218) and communicating with the slot (2191), and a paddle (2195) fixed on the surface of the lever (2193) and passing through the connecting slot (2194). A protruding ring (2110) is fixedly installed on the surface of the circular box (213). The surface of the protruding ring (2110) is provided with a plurality of locking grooves (2111) for engaging the adapter rods (2193). The paddle (2195) is used to move the adapter rods (2193) so that the end of the adapter rods (2193) can disengage from the interior of the locking grooves (2111).

4. The flexible injection needle with a metering injection device according to claim 3, characterized in that: The inner wall of the circular box (213) is provided with an annular groove, and the surface of the rotating cover (216) is fixedly installed with an annular strip, which is adapted to be snapped into the annular groove.

5. The flexible injection needle with a metering injection device according to claim 4, characterized in that: The anti-return component (220) includes a plurality of anti-return ratchet teeth (221) fixed to the bottom of the asymmetrical C-shaped toothed plate (211), a movable hinge (222) fixed to the top of the surface of the injection syringe (110), and a pawl (223) rotatably mounted inside the movable hinge (222) by a torsion spring and adapted to the anti-return ratchet teeth (221).

6. The flexible injection needle with a metering injection device according to claim 5, characterized in that: A base plate (224) is fixedly installed on one side of the movable hinge (222), a first magnetic block (225) is embedded on the top of the base plate (224), and a second magnetic block (226) is embedded on the surface of the pawl (223) to cooperate with the first magnetic block (225). The first magnetic block (225) and the second magnetic block (226) work together to limit the pawl (223) and keep the pawl (223) out of the anti-return ratchet (221), thereby facilitating the return and reset of the piston (150).

7. The flexible injection needle with a metering injection device according to claim 6, characterized in that: A support block (2112) is fixedly installed on the top of the injection syringe (110) and between the mounting brackets (212). A storage groove (2113) is provided on the top of the support block (2112). The asymmetrical C-shaped toothed plate (211) passes through the storage groove (2113). An anti-interference groove (2114) is provided at the bottom of the storage groove (2113) to accommodate the movement of the anti-return ratchet (221). The support block (2112) and the storage groove (2113) work together to provide limiting support for the asymmetrical C-shaped toothed plate (211).

8. The flexible injection needle with a metering injection device according to claim 7, characterized in that: The uniform speed reset component (230) includes two guide rings (231) symmetrically fixed to the surface of the fixed ring (130), a guide rod (232) fixed to one side of the connecting plate (170) and adapted to the guide rings (231), a reset spring (233) fixed between the guide rings (231) and the connecting plate (170) for the piston (150) to reset, a friction plate (234) embedded on the top of the surface of the guide rod (232), and a damping component (235) disposed on the guide ring (231) and used in conjunction with the friction plate (234). The end of the guide ring (231) penetrates the interior of the guide rod (232).

9. The flexible injection needle with a metering injection device according to claim 8, characterized in that: The damping component (235) includes a horizontal plate (2351) disposed above the guide ring (231), a vertical rod (2352) fixed to the top of the guide ring (231) and passing through the horizontal plate (2351), a circular plate fixed to the top of the vertical rod (2352), a compression spring (2353) fixed between the horizontal plate (2351) and the circular plate, two connecting rods (2354) symmetrically fixed to the bottom of the horizontal plate (2351), and a friction block (2355) fixed to the bottom of the connecting rod (2354) and used in conjunction with the friction plate (234).

10. The flexible injection needle with a metering injection device according to claim 9, characterized in that: The top of the guide ring (231) is provided with a square groove (2356) adapted to the friction block (2355), and the surface of the horizontal plate (2351) is provided with a round hole adapted to the vertical rod (2352).

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