Needleless intradermal injector

Abstract

This invention provides a needleless intradermal syringe, belonging to the field of syringe technology. It includes a pressure-adjustable grip mechanism and a liquid-driven locking mechanism connected to the pressure-adjustable grip mechanism via a liquid inlet hose. When the pressure of the injection nozzle on the patient's skin reaches the rated pressure, the device can automatically release the locking effect on the elastic injection mechanism. Therefore, it can actively control the pressure of the injection nozzle on the skin to prevent insufficient pressure leading to medication waste or excessive pressure leading to increased patient pain. Furthermore, the device can adjust the rated pressure according to actual conditions, thus possessing pressure-adjustable functionality.

Description

Technical Field

[0001] This invention relates to the field of syringe technology, and more specifically, to a needleless intradermal syringe. Background Technology

[0002] Needle-free injectors deliver medication without a needle, using a high-pressure jet principle to create a fine stream of liquid that instantly penetrates the skin and reaches the subcutaneous layer. Because of this change in injection principle, the medication diffuses and distributes subcutaneously, resulting in faster onset of action and higher drug absorption.

[0003] Existing technologies also disclose some needle-free injectors. For example, Chinese Patent Publication No. CN221332240U discloses a needle-free rapid injector, whose main structure includes an injection control unit, a firing power unit, a drug reservoir, and an injection chamber. The injection control unit controls the firing and ready-to-fire states of the push rod in the firing power unit. The firing power unit includes the push rod and a static power unit. The push rod includes a dynamic power unit, a firing head, and a fixing part. The firing head and the fixing part are located at opposite ends of the push rod, and the power unit is located in the middle of the push rod. The firing head and the fixing part are fixedly connected to the power unit. The drug reservoir includes a drug capsule compartment for holding a drug capsule. The injection chamber is used to obtain the required amount of medication for the current injection from the drug reservoir. The firing head of the push rod passes through the drug reservoir and engages with the injection chamber, allowing for more convenient and faster injection of the medication.

[0004] However, during actual injection, the patient needs to apply pressure to the needleless rapid injector to press the nozzle firmly against the injection site, and then manually open the unlock button. In order to ensure that the medication can be injected into the intradermal tissue to the maximum extent, the patient needs to ensure that the nozzle is pressed firmly against the injection site during high-pressure injection. At this time, it is easy to cause insufficient pressure, resulting in medication waste, or excessive pressure, resulting in increased pain for the patient. Summary of the Invention

[0005] In view of the problems in the existing technology that are prone to insufficient pressure leading to drug waste or excessive pressure leading to increased patient pain, the purpose of this invention is to provide a needleless intradermal syringe.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] A needleless intradermal syringe includes a flexible liquid-connecting tubing capable of directional liquid drainage, and a pressure-adjustable grip mechanism. The grip mechanism comprises a hollow central sleeve, an outer sleeve fitted over the central sleeve for downward pressure by the patient's hand, a first helical spring positioned between the central and outer sleeves and providing elastic pressure to both, and a threaded sleeve capable of changing the initial positions of the central and outer sleeves. It also includes a liquid-driven locking mechanism connected to the liquid-connecting tubing and the pressure-adjustable grip mechanism, comprising a hollow horizontal outer shell, a locking rod positioned inside the hollow horizontal outer shell that moves to one side when subjected to liquid pressure from the outer sleeve, and a second helical spring capable of resetting the locking rod.

[0008] Optionally, the pressure-adjustable grip mechanism further includes a first piston plate. The center of the middle sleeve has a central sleeve hole structure with open ends. The first piston plate, integrally formed with the middle region of the middle sleeve, is located within the outer sleeve. A first component movable cavity is located inside the outer sleeve. A second component opening, capable of fitting around the upper half of the middle sleeve, is located at the top of the outer sleeve. The first piston plate is placed inside the first component movable cavity. A first helical spring, in a compressed state, is installed in the area between the first piston plate and the inner wall of the top of the outer sleeve within the first component movable cavity. The top of the outer sleeve has a connection to the external space and the first component. The top of the active cavity has a No. 1 docking channel. The top of the outer sleeve is provided with a liquid compensation channel that connects to the external space and the top of the active cavity of the No. 1 component and has a liquid valve installed inside. The bottom of the middle sleeve is provided with a No. 1 component sleeve opening with both ends open. A threaded sleeve that can move relative to the middle sleeve is placed inside the No. 1 component sleeve opening. The top of the threaded sleeve is provided with a No. 1 limiting plate structure that is integral with it and can prevent the threaded sleeve from moving downward and detaching from the middle sleeve. The bottom surface of the No. 1 limiting plate structure abuts against the inner wall of the bottom end of the outer sleeve. The center of the threaded sleeve is provided with an internal threaded hole that is installed on the periphery of the lower half of the middle sleeve structure through a threaded structure.

[0009] Optionally, the threaded structure includes an internal threaded structure disposed in an internal threaded hole and an external threaded structure disposed on the periphery of the lower half of the middle sleeve body structure, and the internal threaded structure and the external threaded structure are matched.

[0010] Optionally, sealing rings that prevent liquid from flowing along the movement gaps are embedded in the outer circumferential side of the first piston plate and the sleeve of the second component.

[0011] Optionally, the liquid-driven locking mechanism further includes a second piston plate. One end of the horizontal hollow housing is provided with a connecting plate structure integrally formed therewith. The interior of the horizontal hollow housing contains a second component movable cavity. At the end of the second component movable cavity near the connecting plate structure, a liquid-limiting flow cavity for liquid flow is provided. One end of the horizontal hollow housing has a first rod through-hole connecting the external space and one end of the liquid-limiting flow cavity. Inside the second component movable cavity, the horizontal hollow housing houses a rod capable of moving along the second piston plate. The second piston plate, which moves axially through the movable cavity of component number 1, has a locking rod fixedly installed at one end of the second piston plate, which passes through the liquid limiting flow cavity and the through hole of the first rod body. The locking rod has a locking head integrally formed with the locking head at one end located outside the horizontal hollow shell. The other end of the second piston plate is equipped with a second helical spring in a compressed state. The bottom of the horizontal hollow shell is provided with a second docking channel that connects the external space and the liquid limiting flow cavity, and the second docking channel and the first docking channel are connected by a liquid docking hose.

[0012] Optionally, sealing rings that prevent liquid from flowing along the movement gaps are embedded in the outer circumferential side of the second piston plate and the through hole of the first rod.

[0013] Optionally, the enclosed area formed by the first component's movable cavity, the first piston plate, the first docking channel, the liquid docking hose, the second docking channel, the liquid limiting flow cavity, and the second piston plate is filled with buffer solution.

[0014] Optionally, it also includes an elastic injection mechanism, which has an injection cylinder fixedly installed inside the central sleeve structure and is hollow inside, a valve stem placed inside the injection cylinder and capable of compressing and discharging insulin outward, a No. 3 helical spring capable of applying downward pressure to the valve stem, and a polygonal locking post capable of moving the valve stem and cooperating with the locking head to be locked.

[0015] Optionally, the elastic injection mechanism further includes a longitudinal tie rod. The injection cylinder is fixedly installed inside the central sleeve structure. The injection cylinder has a third component movable cavity. At the bottom end of the third component movable cavity, the injection cylinder has a liquid injection cavity with an open bottom. A liquid nozzle is installed at the bottom opening of the liquid injection cavity. At the top end of the third component movable cavity, the injection cylinder has a second rod through-hole. At the top end of the second rod through-hole, the injection cylinder has a fourth component movable cavity. At the top end of the fourth component movable cavity, the injection cylinder has a locking insertion groove communicating with the external space. Inside the third component movable cavity, the injection cylinder has a second limiting plate structure capable of moving axially along the third component movable cavity. The bottom end of the second limiting plate structure... A valve stem is installed inside the injection chamber. A third helical spring, capable of being stretched, is installed at the bottom end of the second limiting plate structure. A central connecting rod structure, penetrating the through hole of the second rod, is fixedly installed at the top of the second limiting plate structure. A polygonal locking post, located inside the movable cavity of the fourth component, is fixedly installed at the top edge of the polygonal locking post. An inclined structure, moving from bottom to top towards the center, is provided on the top edge of the polygonal locking post. A longitudinal pull rod, penetrating the locking insertion slot, is fixedly installed at the center of the top of the polygonal locking post. A third helical spring is provided on one vertical surface of the polygonal locking post, supporting the insertion of a locking head. The outer circumference of the injection cylinder has a locking insertion hole, fixedly connected to the connecting plate structure and used for the insertion movement of the locking rod.

[0016] Optionally, the cross-sectional shape of the movable cavity of the fourth component is consistent with the cross-sectional shape of the polygonal locking post, both being polygonal structures, and the structural dimensions of the cross-sectional shape of the movable cavity of the fourth component match the structural dimensions of the cross-sectional shape of the polygonal locking post.

[0017] Compared with the prior art, the technical solution provided by this invention has at least the following beneficial effects:

[0018] In the above solution, when the pressure of the injection nozzle on the patient's skin reaches the rated pressure, the device can automatically release the locking effect on the elastic injection mechanism. Therefore, it can actively control the pressure of the injection nozzle on the skin to prevent insufficient pressure from wasting medication or excessive pressure from increasing the patient's pain. In addition, the device can adjust the rated pressure according to the actual situation, thus having an adjustable pressure function.

[0019] By setting up a pressure-adjustable grip mechanism, when the pressure exceeds the elastic strength of the first helical spring, the middle sleeve and the outer sleeve will contract relative to each other. At this time, the liquid pressure inside the active cavity of the first component will increase, creating a tendency to flow towards the liquid docking hose, thereby converting the pressure on the injection site into the pressure on the buffer solution.

[0020] By setting a liquid-driven locking mechanism, when the elastic pressure in the liquid docking hose exceeds the elastic strength of the second helical spring, the second piston plate will move to one side and continuously compress the second helical spring. This causes the second piston plate to move the locking rod. When the locking head is completely disengaged from the third helical spring, the polygonal locking post will be unlocked, thus achieving both locking and active unlocking of the injection function. Attached Figure Description

[0021] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0024] Figure 3 This is a perspective view of the pressure-adjustable grip mechanism in this invention;

[0025] Figure 4 This is a three-dimensional cross-sectional view of the pressure-adjustable grip mechanism in this invention;

[0026] Figure 5 This is a perspective view of the liquid-driven locking mechanism in this invention;

[0027] Figure 6 This is a three-dimensional cross-sectional view of the liquid-driven locking mechanism in this invention;

[0028] Figure 7 This is a perspective view of the elastic injection mechanism in this invention;

[0029] Figure 8 This is a three-dimensional cross-sectional view of the elastic injection mechanism in this invention.

[0030] [Figure Labels]

[0031] 1. Liquid connection hose;

[0032] 2. Adjustable pressure grip mechanism; 21. Middle sleeve body; 22. Central sleeve structure; 23. Threaded sleeve; 24. Internal threaded hole; 25. Outer sleeve body; 26. Movable cavity of component No. 1; 27. Sleeve opening of component No. 1; 28. Limiting plate structure of component No. 1; 29. ​​Piston plate of component No. 1; 210. Helical spring of component No. 1; 211. Docking channel of component No. 1; 212. Liquid compensation channel; 213. Sleeve opening of component No. 2;

[0033] 3. Liquid-driven locking mechanism; 31. Horizontal hollow shell; 32. Connecting plate structure; 33. Second component movable cavity; 34. Liquid limiting flow cavity; 35. First rod through hole; 36. Second piston plate; 37. Second helical spring; 38. Locking rod; 39. Locking head; 310. Second docking channel;

[0034] 4. Elastic injection mechanism; 41. Injection cylinder; 42. Movable cavity of component No. 3; 43. Drug injection cavity; 44. Drug nozzle; 45. Through hole of rod No. 2; 46. Movable cavity of component No. 4; 47. Locking insertion hole; 48. Locking insertion groove; 49. Valve stem; 410. Limiting plate structure No. 2; 411. Middle connecting rod structure; 412. Polygonal locking post; 413. Inclined structure; 414. Longitudinal tie rod; 415. Helical spring No. 3.

[0035] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0037] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0038] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0039] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0040] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0041] like Figure 1 and Figure 2 As shown, the present invention provides a needleless intradermal syringe, including a flexible liquid docking tube 1 that is curved and capable of directional drainage of liquid. The length of the liquid docking tube 1 needs to be sufficient to allow for relative movement of the structure to which it is connected.

[0042] like Figures 1 to 4As shown, in order to convert the pressure applied to the injection site into pressure on the buffer solution, and to provide adjustable pressure intensity, a pressure-adjustable grip mechanism 2 is required. This mechanism includes a hollow central sleeve 21, an outer sleeve 25 fitted over the central sleeve 21 for the patient to grip and apply downward pressure, a primary helical spring 210 positioned between the central sleeve 21 and the outer sleeve 25 to provide elastic pressure to both, and a threaded sleeve 23 capable of changing the initial positions of the central sleeve 21 and the outer sleeve 25. The patient grips the outer sleeve 25, causing the injection port of the syringe 41 to press against the injection site and apply pressure. When this pressure exceeds the elastic strength of the primary helical spring 210, the central sleeve 21 and the outer sleeve 25 will contract relative to each other. At this point, the position... The liquid pressure inside the movable cavity 26 of component one will increase, creating a tendency to flow towards the liquid docking hose 1, thereby converting the pressure on the injection site into the pressure on the buffer solution. When it is necessary to adjust the above elastic strength, the threaded sleeve 23 can be rotated in a directional manner. Due to the threaded connection, the threaded sleeve 23 will move longitudinally, thereby changing the relative position difference between the outer sleeve body 25 and the middle sleeve body 21, so as to change the distance between the piston plate 29 and the top of the movable cavity 26 of component one in the initial state, and thus change the elastic strength of the coil spring 210. During operation, the patient needs to apply a pressure of not less than the above elastic strength to the injection site in order for the liquid to flow into the liquid docking hose 1. Of course, after the adjustment is completed, a liquid syringe needs to be used to inject sufficient buffer solution through the liquid compensation channel 212.

[0043] like Figure 3 and Figure 4As shown, the adjustable grip mechanism 2 also includes a first piston plate 29. The center of the middle sleeve body 21 has a central sleeve hole structure 22 with both ends open. The first piston plate 29, integrally formed with the middle sleeve body 21, is located in the middle region of the middle sleeve body 21. The outer sleeve body 25 has a first component movable cavity 26 inside. The top of the outer sleeve body 25 has a second component opening 213 that can be fitted onto the outer periphery of the upper half of the middle sleeve body 21. The first piston plate 29 is placed inside the first component movable cavity 26. A first coil spring 210 in a compressed state is installed in the area between the first piston plate 29 and the inner wall of the top of the outer sleeve body 25 in the first component movable cavity 26. The top of the outer sleeve body 25 has a first docking channel 211 connecting the external space and the top of the first component movable cavity 26. The top of the sleeve 21 has a liquid compensation channel 212 with a liquid valve installed inside. The bottom of the middle sleeve 21 is fitted with a first component sleeve 27 with both ends open. The middle sleeve 21 has a threaded sleeve 23 that can move relative to it inside the first component sleeve 27. The top of the threaded sleeve 23 is provided with a first limiting plate structure 28 that is integral with it and can prevent the threaded sleeve 23 from moving downward and detaching from the middle sleeve 21. The center of the threaded sleeve 23 is provided with an internal threaded hole 24 that is installed on the periphery of the lower half of the middle sleeve 21 through a threaded structure. The threaded structure includes an internal thread structure in the internal threaded hole 24 and an external thread structure on the periphery of the lower half of the middle sleeve 21. The internal thread structure and the external thread structure are matched. The outer circumferential side of the first piston plate 29 and the second component sleeve 213 are both embedded with sealing rings that can prevent liquid from flowing along the movement gap.

[0044] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in order to achieve the locking and active unlocking functions of the injection function, a liquid-driven locking mechanism 3 is required. This mechanism includes a hollow horizontal shell 31, a locking rod 38 placed inside the shell 31 that moves to one side when subjected to liquid pressure from the external sleeve 25, and a second helical spring 37 that resets the locking rod 38. When the elastic pressure in the liquid connection hose 1 exceeds the elastic strength of the second helical spring 37, the second piston plate 36 moves to one side, continuously compressing the second helical spring 37. This causes the second piston plate 36 to move the locking rod 38. When the locking head 39 completely disengages from the third helical spring 415, it unlocks the polygonal locking post 412, thus achieving the locking and active unlocking functions of the injection function.

[0045] like Figure 5 and Figure 6 As shown, the liquid-driven locking mechanism 3 further includes a second piston plate 36. A connecting plate structure 32, integrally formed with the horizontal hollow shell 31, is provided at one end of the horizontal hollow shell 31. A second component movable cavity 33 is provided inside the horizontal hollow shell 31. A liquid-limiting flow cavity 34 for liquid flow is provided at one end of the second component movable cavity 33 near the connecting plate structure 32. A first rod through-hole 35, connecting the external space and one end of the liquid-limiting flow cavity 34, is provided at one end of the horizontal hollow shell 31. A second piston plate 36, capable of moving axially along the second component movable cavity 33, is placed inside the horizontal hollow shell 31 within the second component movable cavity 33. A locking rod 38, penetrating the liquid-limiting flow cavity 34 and the first rod through-hole 35, is fixedly installed at one end of the second piston plate 36. The locking rod 38... A locking head 39, integrally formed with the horizontal hollow shell 31, is provided at one end outside the shell. A second helical spring 37, in a compressed state, is placed at the other end of the second piston plate 36. A second docking channel 310, which connects the external space and the liquid limiting flow cavity 34, is provided at the bottom of the horizontal hollow shell 31. The second docking channel 310 and the first docking channel 211 are connected by a liquid docking hose 1. Sealing rings that prevent liquid from flowing along the movement gap are embedded in the outer circumferential side of the second piston plate 36 and the through hole 35 of the first rod. The closed area formed by the first component moving cavity 26, the first piston plate 29, the first docking channel 211, the liquid docking hose 1, the second docking channel 310, the liquid limiting flow cavity 34, and the second piston plate 36 is filled with buffer solution.

[0046] like Figure 1 , Figure 2 , Figure 7 and Figure 8As shown, to achieve the flexible needle-free injection function, an flexible injection mechanism 4 is required. Inside the mechanism 4 is a hollow syringe 41 fixedly installed inside the central sleeve structure 22; a valve stem 49 placed inside the syringe 41 that compresses and discharges insulin; a No. 3 helical spring 415 that applies downward pressure to the valve stem 49; and a polygonal locking post 412 that moves the valve stem 49 and engages with the locking head 39 to lock it in place. Pulling the longitudinal rod 414 upwards allows insulin to be drawn into the injection chamber 43 through the bottom opening. Inside the drug injection chamber 43, until the locking head 39 is inserted into the third helical spring 415, the third helical spring 415 is in a stretched state, and the third helical spring 415 exerts a downward pulling force on the second limiting plate structure 410. Once the locking head 39 is completely disengaged from the third helical spring 415, under the action of this elastic pulling force, the valve stem 49 will exert pressure on the insulin located inside the drug injection chamber 43, so that the insulin is sprayed into the patient's subcutaneous tissue through the drug nozzle 44 under the action of pressure, thereby realizing the elastic needleless injection function.

[0047] like Figure 7 and Figure 8 As shown, the elastic injection mechanism 4 also includes a longitudinal tie rod 414. An injection cylinder 41 is fixedly installed inside the central sleeve structure 22. The injection cylinder 41 has a third component movable cavity 42 inside. At the bottom end of the third component movable cavity 42, the injection cylinder 41 has a liquid injection cavity 43 with an open bottom. A liquid nozzle 44 is installed at the bottom opening of the liquid injection cavity 43. At the top end of the third component movable cavity 42, the injection cylinder 41 has a second rod through hole 45. At the top end of the second rod through hole 45, the injection cylinder 41 has a fourth component movable cavity 46. At the top end of the fourth component movable cavity 46, the injection cylinder 41 has a locking insertion groove 48 connecting to the external space. Inside the third component movable cavity 42, the injection cylinder 41 has a second limiting plate structure 410 that can move axially along the third component movable cavity 42. The bottom end of the second limiting plate structure 410 is equipped with a valve stem 49 that is inserted into the drug injection cavity 43. A third helical spring 415 that can be in a stretched state is installed around the valve stem 49 and at the bottom end of the second limiting plate structure 410. The top end of the second limiting plate structure 410 is fixedly equipped with a middle connecting rod structure 411 that passes through the second rod body through hole 45. The top end of the middle connecting rod structure 411 is fixedly equipped with a polygonal locking post 412 located inside the fourth component movable cavity 46. The top edge area of ​​the polygonal locking post 412 is provided with a slope structure 413 that moves from bottom to top towards the center. The center of the top end of the polygonal locking post 412 is fixedly equipped with a longitudinal pull rod 414 that passes through the locking insertion groove 48. A third helical spring 415 is provided on one vertical surface of the polygonal locking post 412. The third helical spring 415 supports the insertion of the locking head 39.

[0048] The outer circumferential surface of the injection cylinder 41 is provided with a locking insertion hole 47 that is fixedly connected to the connecting plate structure 32 and is used for the insertion movement of the locking rod 38. The cross-sectional shape of the movable cavity 46 of the fourth component is consistent with the cross-sectional shape of the polygonal locking post 412, both being polygonal structures. Furthermore, the cross-sectional dimensions of the movable cavity 46 of the fourth component match the cross-sectional dimensions of the polygonal locking post 412.

[0049] Note that the bottom end of the No. 3 helical spring 415 is fixedly installed at the bottom end of the No. 3 component movable cavity 42, and the top end is fixedly installed at the bottom end of the No. 2 limiting plate structure 410.

[0050] The workflow of the technical solution provided by this invention is as follows:

[0051] In use, pull the longitudinal lever 414 upwards to draw insulin into the injection chamber 43 through the bottom opening until the locking head 39 is inserted into the third helical spring 415. The patient holds the outer sleeve 25 and then presses the injection port of the syringe 41 against the skin, applying pressure. When this pressure exceeds the elastic strength of the first helical spring 210, the middle sleeve 21 and the outer sleeve 25 will contract relative to each other. At this time, the liquid pressure inside the first component's movable cavity 26 will increase, creating a pressure that moves towards the liquid contact soft... When the flow in tube 1 is greater than the elastic strength of the second helical spring 37 due to the elastic pressure in the liquid docking hose 1, the second piston plate 36 will move to one side and continuously compress the second helical spring 37. This causes the second piston plate 36 to move the locking rod 38. When the locking head 39 is completely disengaged from the third helical spring 415, the valve rod 49 will exert pressure on the insulin inside the drug injection chamber 43 under the action of elastic force. Under the action of pressure, the insulin will be sprayed into the patient's subcutaneous tissue through the drug nozzle 44, thereby realizing the elastic needleless injection function.

[0052] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0053] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A needleless intradermal syringe, comprising a flexible liquid-connecting tube capable of directional liquid drainage, characterized in that: It also includes, The pressure-adjustable grip mechanism has a hollow central sleeve, an outer sleeve that is fitted outside the central sleeve and used by the patient's hand to apply downward pressure, a No. 1 helical spring that is placed between the central sleeve and the outer sleeve and provides elastic pressure to both, and a threaded sleeve that can change the initial position of the central sleeve and the outer sleeve. And a liquid driven locking mechanism connected by a liquid docking hose and a pressure adjustable grip mechanism, which is provided with a horizontal hollow shell with a hollow interior, a locking rod placed inside the horizontal hollow shell that moves to one side when subjected to liquid pressure from the external sleeve, and a second helical spring that can reset the locking rod. The pressure-adjustable grip mechanism also includes a first piston plate. The center of the middle sleeve has a central sleeve hole structure with open ends. The first piston plate, integrally formed with the middle region of the middle sleeve, is located within the middle region of the middle sleeve. A first component movable cavity is located inside the outer sleeve. A second component opening, capable of fitting around the upper half of the middle sleeve, is located at the top of the outer sleeve. The first piston plate is placed inside the first component movable cavity. A first helical spring, in a compressed state, is installed in the region between the first piston plate and the inner wall of the top of the outer sleeve within the first component movable cavity. A connecting... The outer sleeve has a first docking channel connecting the external space and the top of the first component's movable cavity. The top of the outer sleeve has a liquid compensation channel connecting the external space and the top of the first component's movable cavity and has a liquid valve installed inside. The bottom of the middle sleeve has a first component sleeve opening with both ends open. A threaded sleeve that can move relative to the first component sleeve opening is placed inside the middle sleeve. The top of the threaded sleeve has a first limiting plate structure that is integral with it and can prevent the threaded sleeve from moving downward and detaching from the middle sleeve. The center of the threaded sleeve has an internal threaded hole that is installed on the periphery of the lower half of the middle sleeve structure through a threaded structure. The threaded structure includes an internal threaded structure disposed in an internal threaded hole and an external threaded structure disposed on the periphery of the lower half of the middle sleeve body structure, and the internal threaded structure and the external threaded structure are matched. Both the outer circumferential side of the first piston plate and the sleeve of the second component are embedded with sealing rings that can prevent liquid from flowing along the movement gaps. The liquid-driven locking mechanism also includes a second piston plate. One end of the horizontal hollow shell is provided with a connecting plate structure integral with it. The interior of the horizontal hollow shell is provided with a second component movable cavity. The second component movable cavity has a liquid limiting flow cavity for liquid flow at the end near the connecting plate structure. One end of the horizontal hollow shell is provided with a first rod through hole connecting the external space and one end of the liquid limiting flow cavity. The second piston plate, which can move axially along the second component movable cavity, is placed inside the horizontal hollow shell. A locking rod that passes through the liquid limiting flow cavity and the first rod through hole is fixedly installed at one end of the second piston plate. The locking rod has a locking head integral with it at the end outside the horizontal hollow shell. A second helical spring in a compressed state is placed at the other end of the second piston plate. The bottom of the horizontal hollow shell is provided with a second docking channel connecting the external space and the liquid limiting flow cavity, and the second docking channel and the first docking channel are connected by a liquid docking hose.

2. The needleless intradermal syringe according to claim 1, characterized in that, Both the outer circumferential side of the second piston plate and the through hole of the first rod are fitted with sealing rings to prevent liquid from flowing along the movement gaps.

3. The needleless intradermal syringe according to claim 2, characterized in that, The enclosed area formed by the movable cavity of component number one, piston plate number one, docking channel number one, liquid docking hose, docking channel number two, liquid limiting flow cavity and piston plate number two is filled with buffer solution.

4. The needleless intradermal syringe according to claim 3, characterized in that, It also includes an elastic injection mechanism, which has an injection cylinder fixedly installed inside the central sleeve structure and is hollow inside, a valve stem placed inside the injection cylinder that can compress insulin and discharge it outward, a No. 3 helical spring that can apply downward pressure to the valve stem, and a polygonal locking post that can drive the valve stem to move and cooperate with the locking head to be locked.

5. The needleless intradermal syringe according to claim 4, characterized in that, The elastic injection mechanism also includes a longitudinal tie rod. The injection cylinder is fixedly installed inside the central sleeve structure. The injection cylinder has a third component movable cavity. At the bottom end of the third component movable cavity, the injection cylinder has a liquid injection cavity with an open bottom. A liquid nozzle is installed at the bottom opening of the liquid injection cavity. At the top end of the third component movable cavity, the injection cylinder has a second rod through-hole. At the top end of the second rod through-hole, the injection cylinder has a fourth component movable cavity. At the top end of the fourth component movable cavity, the injection cylinder has a locking insertion groove connecting to the external space. Inside the third component movable cavity, the injection cylinder houses a second component capable of moving axially along the third component movable cavity. The limiting plate structure includes a valve rod inserted into the injection chamber at the bottom of the second limiting plate structure. A third helical spring capable of being in a stretched state is installed around the valve rod at the bottom of the second limiting plate structure. A central connecting rod structure penetrating the hole of the second rod body is fixedly installed at the top of the second limiting plate structure. A polygonal locking post located inside the movable cavity of the fourth component is fixedly installed at the top edge of the polygonal locking post. An inclined structure from bottom to top towards the center is provided in the top edge area of ​​the polygonal locking post. A longitudinal tie rod penetrating the locking insertion slot is fixedly installed at the center of the top of the polygonal locking post. A third helical spring is provided on one vertical surface of the polygonal locking post, and the third helical spring supports the insertion of a locking head. The outer circumferential surface of the injection cylinder is provided with a locking insertion hole that is fixedly connected to the connecting plate structure and is used for the insertion movement of the locking rod.

6. The needleless intradermal syringe according to claim 5, characterized in that, The cross-sectional shape of the movable cavity of component No. 4 is consistent with the cross-sectional shape of the polygonal locking post, both being polygonal structures, and the structural dimensions of the cross-sectional shape of the movable cavity of component No. 4 match the structural dimensions of the cross-sectional shape of the polygonal locking post.

Images