Needle-free intradermal injector

Abstract

The invention provides a needle-free intradermal injector, and belongs to the technical field of injectors. Comprising a pressure-adjustable grip mechanism and a liquid driven locking mechanism communicated with the pressure-adjustable grip mechanism through a liquid butt joint hose. According to the needle-free intradermal injector, after the pressure of the injection nozzle on the injection skin of a patient reaches the rated pressure, the locking effect on the elastic injection mechanism can be automatically relieved, and therefore the pressure of the injection nozzle on the injection skin can be actively controlled; in addition, the device can adjust the rated pressure according to the actual situation, and therefore the device has the function of adjusting the pressure, and the medicine waste phenomenon caused by insufficient pressing force or the pain degree increase phenomenon of a patient caused by too large pressing force can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of syringes, and more particularly to a needleless intradermal syringe. Background Art

[0002] Needle-free injectors, which dispense medication without a needle, utilize a high-pressure jet to create a thin stream of liquid medication that instantly penetrates the skin and reaches the subcutaneous layer. This change in injection principle allows the medication to diffuse more deeply into the subcutaneous layer, resulting in a faster onset of action and higher absorption rates.

[0003] The prior art also discloses some needle-free syringes. For example, the Chinese patent with publication number CN221332240U discloses a needle-free rapid syringe, whose main structure includes an injection control part, a firing power part, a medicine chamber part, and an injection chamber part; wherein, the injection control part is used to control the firing and ready-to-fire states of the push rod in the firing power part; the firing power part includes the push rod and the static power part, and the push rod includes a dynamic power part, a firing head, and a fixed part, the firing head and the fixed part are respectively located at the two ends of the push rod, and the power part is located in the middle of the push rod, and the firing head and the fixed part are respectively fixedly connected to the power part; the medicine chamber part includes a medicine bag chamber for placing medicine bags; the injection chamber part is used to obtain the current injection amount of liquid medicine from the medicine chamber part; the firing head of the push rod passes through the medicine chamber part and cooperates with the injection chamber part, which can more conveniently and quickly inject the liquid medicine.

[0004] However, during the actual injection, the patient needs to apply pressure to the needle-free rapid injector on his own so that the nozzle is pressed tightly against the injection skin, and then manually open the unlock button. At this time, in order to ensure that the drug solution can be injected into the intradermal tissue to the maximum extent, during the high-pressure injection of the drug, the patient needs to ensure that the nozzle is pressed tightly against the injection skin. At this time, it is easy for the pressure to be insufficient, resulting in drug waste, or the pressure to be too great, resulting in increased pain for the patient. Summary of the Invention

[0005] In view of the problems in the prior art that insufficient pressing force may cause drug waste or excessive pressing force may cause increased pain for the patient, the purpose of the present invention is to provide a needle-free intradermal syringe.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] A needle-free intradermal syringe comprises a liquid docking hose which is curved and capable of directionally draining liquid, and a pressure-adjustable grip mechanism, the interior of which is provided with a middle sleeve body with a hollow interior, an outer sleeve body which is sleeved on the outside of the middle sleeve body and is used for the patient to grip downward to apply pressure, a No. 1 coil spring which is arranged between the middle sleeve body and the outer sleeve body and exerts elastic pressure on both, and a threaded sleeve which can change the initial positions of the middle sleeve body and the outer sleeve body; and a liquid-driven locking mechanism which is connected to the liquid docking hose and the pressure-adjustable grip mechanism, the interior of which is provided with a horizontal hollow outer shell with a hollow interior, a locking rod which is arranged inside the horizontal hollow outer shell and moves to one side when subjected to liquid pressure from the outer sleeve body, and a No. 2 coil spring which can reset the locking rod.

[0008] Optionally, the pressure-adjustable grip mechanism also includes a No. 1 piston plate, the center of the middle sleeve body is provided with a central sleeve hole structure with open ends, the middle area of ​​the middle sleeve body is provided with a No. 1 piston plate with an integral structure therewith, the interior of the outer sleeve body is provided with a No. 1 component movable chamber, the top of the outer sleeve body is provided with a No. 2 component sleeve that can be placed on the periphery of the upper half area of ​​the middle sleeve body, the No. 1 piston plate is placed inside the No. 1 component movable chamber, the No. 1 component movable chamber is installed with a No. 1 coil spring in a compressed state in the area between the No. 1 piston plate and the inner wall of the top end of the outer sleeve body, and the top of the outer sleeve body is provided with a connection between the external space and the No. 1 component The top of the movable cavity is provided with a No. 1 docking channel, and the top of the outer sleeve body is provided with a liquid compensation channel which connects the external space and the top of the movable cavity of the No. 1 component and is internally installed with a liquid valve, and the bottom end of the middle sleeve body is provided with a No. 1 component sleeve with both ends open, and the middle sleeve body is provided with a threaded sleeve which can move relative to it inside the No. 1 component sleeve, and the top of the threaded sleeve is provided with a No. 1 limit plate structure which is an integral structure with it and can prevent the threaded sleeve from moving downward and detaching from the middle sleeve body, and the bottom surface of the No. 1 limit plate structure abuts against the inner wall of the bottom end of the outer sleeve body, and the center of the threaded sleeve is provided with an internal threaded hole which is installed on the periphery of the lower half structure of the middle sleeve body through a threaded structure.

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

[0010] Optionally, a sealing ring capable of preventing liquid from flowing along the moving gap is embedded in the outer circumferential side surface of the No. 1 piston plate and the sleeve opening of the No. 2 component.

[0011] Optionally, the liquid driven locking mechanism also includes a No. 2 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 No. 2 component active chamber, the No. 2 component active chamber is provided with a liquid limiting flow chamber for liquid flow at one end close to the connecting plate structure, one end of the horizontal hollow shell is provided with a No. 1 rod body through-hole connecting the external space and one end of the liquid limiting flow chamber, and the horizontal hollow shell is provided with a No. 2 rod body through-hole that can move along the No. 2 rod body inside the No. 2 component active chamber. A No. 2 piston plate is provided for axial movement in the movable chamber of the No. 1 component, and a locking rod is fixedly installed on one end of the No. 2 piston plate, which passes through the liquid limiting flow chamber and the perforation of the No. 1 rod body, and a locking head with an integral structure therewith is provided at one end of the locking rod located outside the horizontal hollow shell, and a No. 2 coil spring in a compressed state is placed on the other end of the No. 2 piston plate, and a No. 2 docking channel connecting the external space and the liquid limiting flow chamber is provided at the bottom of the horizontal hollow shell, and the No. 2 docking channel and the No. 1 docking channel are connected by a liquid docking hose.

[0012] Optionally, a sealing ring capable of preventing liquid from flowing along the movement gap is embedded in the outer circumferential side surface of the No. 2 piston plate and the through hole of the No. 1 rod body.

[0013] Optionally, the closed area formed by the No. 1 component movable cavity, No. 1 piston plate, No. 1 docking channel, liquid docking hose, No. 2 docking channel, liquid limiting flow cavity and No. 2 piston plate is filled with buffer solution.

[0014] Optionally, it also includes an elastic injection mechanism, which is internally provided with a syringe fixedly installed inside the central sleeve structure and in a hollow interior, a valve stem placed inside the syringe and capable of compressing insulin and discharging it outward, a No. 3 coil spring capable of applying downward pressure to the valve stem, and a polygonal locking column capable of driving the valve stem to move and cooperating with a locking head to achieve locking.

[0015] Optionally, the elastic injection mechanism also includes a longitudinal pull rod, the injection cylinder is fixedly installed inside the central sleeve structure, a movable cavity of component No. 3 is provided inside the injection cylinder, a medicine liquid injection cavity with an open bottom is provided at the bottom end of the movable cavity of component No. 3, a medicine liquid nozzle is installed at the bottom open end of the medicine liquid injection cavity, the injection cylinder is provided with a No. 2 rod body through-hole at the top end of the movable cavity of component No. 3, the injection cylinder is provided with a movable cavity of component No. 4 at the top end of the No. 2 rod body through-hole, the injection cylinder is provided with a locking insertion groove connected to the external space at the top end of the movable cavity of component No. 4, the injection cylinder is provided with a No. 2 limit plate structure connected to the axial direction of the movable cavity of component No. 3 placed inside the movable cavity of component No. 3, the bottom end of the No. 2 limit plate structure A valve stem is installed that is inserted into the medicine injection cavity, and the valve stem is installed with a No. 3 coil spring that can be in a stretched state at the bottom end of the No. 2 limit plate structure, and a middle connecting rod structure that passes through the through-hole of the No. 2 rod body is fixedly installed on the top of the No. 2 limit plate structure, and a polygonal locking column located inside the movable cavity of the No. 4 component is fixedly installed on the top of the middle connecting rod structure. The top edge area of ​​the polygonal locking column is provided with an inclined surface structure that converges from bottom to top toward the center, and a longitudinal pull rod that passes through the locking insertion groove is fixedly installed at the center of the top of the polygonal locking column, and a vertical surface of the polygonal locking column is provided with a No. 3 coil spring, and the locking head is supported and inserted in the No. 3 coil spring; 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 used for the insertion movement of the locking rod.

[0016] Optionally, the structural shape of the cross section of the movable cavity of the fourth component is consistent with the structural shape of the cross section of the polygonal locking column, both are polygonal structures, and the structural dimensions of the cross section of the movable cavity of the fourth component match the structural dimensions of the cross section of the polygonal locking column.

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

[0018] In the above scheme, when the pressure of the injection nozzle on the patient's injection skin reaches the rated pressure, the device can autonomously release the locking effect of the elastic injection mechanism. Therefore, it can actively control the pressure of the injection nozzle on the injection skin to prevent insufficient pressing force from causing drug waste or excessive pressing force from causing increased pain for the patient. In addition, the device can adjust the size of the above rated pressure according to actual conditions, thereby having an adjustable pressure function.

[0019] By setting up a pressure-adjustable grip mechanism, when the pressure is greater than the elastic strength of the No. 1 coil spring, the middle sleeve body and the outer sleeve body will undergo relative contraction. At this time, the liquid pressure inside the active cavity of component No. 1 will increase, and there will be a tendency to flow toward the liquid docking hose, thereby converting the pressure on the injection skin into pressure on the buffer solution.

[0020] By setting up a liquid-driven locking mechanism, when the elastic pressure entering the liquid docking hose is greater than the elastic strength of the No. 2 coil spring, the No. 2 piston plate will move to one side and continuously compress the No. 2 coil spring, thereby causing the No. 2 piston plate to drive the locking rod to move. When the locking head is completely separated from the No. 3 coil spring, the polygonal locking column will be unlocked, thereby realizing the locking function of the injection function and the active unlocking function. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 1 A perspective view of the present invention;

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

[0024] Figure 3 A perspective view of the pressure-adjustable grip mechanism of the present invention;

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

[0026] Figure 5 A perspective view of the liquid driven locking mechanism of the present invention;

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

[0028] Figure 7 is a three-dimensional diagram of the elastic injection mechanism of the present invention;

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

[0030] [Reference Signs]

[0031] 1. Liquid docking hose;

[0032] 2. Pressure-adjustable grip mechanism; 21. Central sleeve body; 22. Center sleeve hole structure; 23. Threaded sleeve; 24. Internally threaded hole; 25. External sleeve body; 26. Active cavity of component No. 1; 27. Socket opening of component No. 1; 28. Stop plate structure No. 1; 29. ​​Piston plate No. 1; 210. Coil spring No. 1; 211. Docking channel No. 1; 212. Liquid compensation channel; 213. Socket opening of component No. 2;

[0033] 3. Liquid driven locking mechanism; 31. Horizontal hollow housing; 32. Connecting plate structure; 33. Active chamber of component No. 2; 34. Liquid limiting flow chamber; 35. Through hole of rod No. 1; 36. Piston plate No. 2; 37. Coil spring No. 2; 38. Locking rod; 39. Locking head; 310. Docking channel No. 2;

[0034] 4. Elastic injection mechanism; 41. Injection cylinder; 42. Active cavity of component No. 3; 43. Liquid medicine injection cavity; 44. Liquid medicine nozzle; 45. Through hole of rod No. 2; 46. Active cavity of component No. 4; 47. Locking insertion hole; 48. Locking insertion groove; 49. Valve stem; 410. Limit plate structure No. 2; 411. Middle connecting rod structure; 412. Polygonal locking column; 413. Inclined surface structure; 414. Longitudinal pull rod; 415. Coil spring No. 3.

[0035] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0036] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative methods for implementing certain known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0037] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

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

[0039] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” means not only “directly on” something but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” means not only “on” or “above” something but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0040] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0041] like Figure 1 and Figure 2 As shown, the present invention provides a needle-free intradermal syringe, comprising a liquid docking hose 1 that is curved and capable of directionally draining liquid. The length of the liquid docking hose 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 on the injection skin into the pressure on the buffer solution and at the same time have the adjustability of the pressure intensity, a pressure-adjustable grip mechanism 2 is required, wherein a middle sleeve body 21 with a hollow interior is provided inside the grip mechanism 2, an outer sleeve body 25 which is sleeved outside the middle sleeve body 21 and is used for the patient to hold downward pressure, a No. 1 coil spring 210 which is placed between the middle sleeve body 21 and the outer sleeve body 25 and exerts elastic pressure on both, and a threaded sleeve 23 which can change the initial position of the middle sleeve body 21 and the outer sleeve body 25. The patient holds the outer sleeve body 25 and then presses the injection port of the syringe 41 on the injection skin and applies pressure to the skin. When the pressure is greater than the elastic strength of the No. 1 coil spring 210, the middle sleeve body 21 and the outer sleeve body 25 will be relatively contracted. At this time, the position The liquid pressure inside the active cavity 26 of component No. 1 will increase, generating a tendency to flow toward the liquid docking hose 1, thereby converting the pressure on the injection skin into pressure on the buffer solution. When the above-mentioned elastic strength needs to be adjusted, the threaded sleeve 23 can be rotated in a direction. Due to the threaded structure 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 at this time, so as to change the distance between the No. 1 piston plate 29 and the top of the active cavity 26 of component No. 1 in the initial state, thereby changing the elastic strength of the No. 1 coil spring 210 at this time. During operation, the patient needs to apply a pressure of not less than the above-mentioned elastic strength to the injection skin to enable the liquid to flow into the liquid docking hose 1. Of course, after the adjustment is completed, it is necessary to use a liquid syringe 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 No. 1 piston plate 29, a central sleeve structure 22 with open ends is provided at the inner center of the middle sleeve body 21, a No. 1 piston plate 29 with an integral structure is provided in the middle area of ​​the middle sleeve body 21, a No. 1 component movable chamber 26 is provided inside the outer sleeve body 25, and a No. 2 component sleeve 213 is provided at the top end of the outer sleeve body 25 which can be sleeved on the periphery of the upper half area of ​​the middle sleeve body 21, the No. 1 piston plate 29 is placed inside the No. 1 component movable chamber 26, and the No. 1 component movable chamber 26 is installed with a No. 1 coil spring 210 in a compressed state in the area between the No. 1 piston plate 29 and the inner wall of the top end of the outer sleeve body 25, the top end of the outer sleeve body 25 is provided with a No. 1 docking channel 211 connecting the external space and the top end of the No. 1 component movable chamber 26, and the top end of the outer sleeve body 25 is provided with a No. 2 component sleeve 213 connecting the external space and the No. 1 component movable chamber 26. The top of the middle sleeve body 21 is provided with a liquid compensation channel 212 with a liquid valve installed inside. The bottom end of the middle sleeve body 21 is provided with a component sleeve 27 with both ends open. The middle sleeve body 21 is provided with a threaded sleeve 23 capable of relative movement inside the component sleeve 27. The top of the threaded sleeve 23 is provided with a No. 1 limit plate structure 28 which is an integral structure with it and can prevent the threaded sleeve 23 from moving downward and detaching from the middle sleeve body 21. The inner center of the threaded sleeve 23 is provided with an internal threaded hole 24 installed on the periphery of the lower half structure of the middle sleeve body 21 through a threaded structure. The threaded structure includes an internal threaded structure arranged in the internal threaded hole 24 and an external threaded structure arranged on the periphery of the lower half structure of the middle sleeve body 21, and the internal threaded structure matches the external threaded structure. The outer circumferential side surface of the No. 1 piston plate 29 and the component sleeve 213 are embedded with a sealing ring that can prevent the liquid from flowing along the moving gap.

[0044] like Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, in order to realize the locking and active unlocking functions of the injection function, a liquid driven locking mechanism 3 is required to be provided, wherein a horizontal hollow shell 31 with a hollow interior is provided inside the liquid driven locking mechanism 3, and a locking rod 38 is placed inside the horizontal hollow shell 31 and moves to one side when subjected to the liquid pressure from the external sleeve body 25, and a No. 2 coil spring 37 that can reset the locking rod 38. When the elastic pressure entering the liquid docking hose 1 is greater than the elastic strength of the No. 2 coil spring 37, the No. 2 piston plate 36 will move to one side and continuously compress the No. 2 coil spring 37, so that the No. 2 piston plate 36 drives the locking rod 38 to move. When the locking head 39 is completely separated from the No. 3 coil spring 415, the polygonal locking column 412 will be unlocked, thereby realizing 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 also includes a No. 2 piston plate 36, a connecting plate structure 32 with an integral structure thereof is provided at one end of the horizontal hollow shell 31, a No. 2 component active chamber 33 is provided inside the horizontal hollow shell 31, a liquid limiting flow chamber 34 for liquid flow is provided at one end of the No. 2 component active chamber 33 close to the connecting plate structure 32, a No. 1 rod body through-hole 35 connecting the external space and one end of the liquid limiting flow chamber 34 is provided at one end of the horizontal hollow shell 31, a No. 2 piston plate 36 capable of axially moving along the No. 2 component active chamber 33 is placed inside the No. 2 component active chamber 33 of the horizontal hollow shell 31, a locking rod 38 penetrating the liquid limiting flow chamber 34 and the No. 1 rod body through-hole 35 is fixedly installed at one end of the No. 2 piston plate 36, and the locking rod 38 is fixedly installed at one end of the No. 2 piston plate 36. A locking head 39 with an integral structure is provided at one end located outside the horizontal hollow shell 31, and a No. 2 coil spring 37 in a compressed state is placed at the other end of the No. 2 piston plate 36. A No. 2 docking channel 310 connecting the external space and the liquid limiting flow chamber 34 is provided at the bottom of the horizontal hollow shell 31, and the No. 2 docking channel 310 and the No. 1 docking channel 211 are connected through a liquid docking hose 1. The outer circumferential side surface of the No. 2 piston plate 36 and the No. 1 rod body through-hole 35 are embedded with sealing rings that can prevent liquid from flowing along the moving gap. The closed area composed of the No. 1 component movable chamber 26, the No. 1 piston plate 29, the No. 1 docking channel 211, the liquid docking hose 1, the No. 2 docking channel 310, the liquid limiting flow chamber 34 and the No. 2 piston plate 36 is filled with a buffer solution.

[0046] like Figure 1 、 Figure 2 、 Figure 7 and Figure 8As shown, in order to realize the elastic needle-free injection function, an elastic injection mechanism 4 is required, wherein an injection barrel 41 fixedly mounted inside the central sleeve structure 22 and in a hollow state is provided inside the injection barrel 41, a valve stem 49 placed inside the injection barrel 41 and capable of compressing insulin and discharging it outwards, a No. 3 coil spring 415 capable of exerting downward pressure on the valve stem 49, and a polygonal locking column 412 capable of driving the valve stem 49 to move and cooperate with the locking head 39 to be locked. The longitudinal pull rod 414 is pulled upward, so that the insulin is sucked into the bottom opening end of the liquid injection cavity 43. The medicine injection cavity 43 is inserted into the locking head 39 until the locking head 39 is inserted into the interior of the No. 3 coil spring 415. At this time, the No. 3 coil spring 415 is in a stretched state, and the No. 3 coil spring 415 generates a downward pulling force on the No. 2 limit plate structure 410. Once the locking head 39 is completely separated from the No. 3 coil spring 415, the valve stem 49 will generate pressure on the insulin located inside the medicine injection cavity 43 under the action of the elastic pulling force, so that the insulin is sprayed into the patient's subcutaneous tissue through the medicine nozzle 44 under the action of pressure, thereby realizing the elastic needle-free injection function.

[0047] like Figure 7 and Figure 8 As shown, the elastic injection mechanism 4 also includes a longitudinal pull rod 414, an injection cylinder 41 is fixedly mounted inside the central sleeve structure 22, a movable chamber 42 of the third component is provided inside the injection cylinder 41, a liquid medicine injection chamber 43 with an open bottom is provided at the bottom end of the movable chamber 42 of the third component, a liquid medicine nozzle 44 is installed at the bottom open end of the liquid medicine injection chamber 43, a second rod body through-hole 45 is provided at the top end of the movable chamber 42 of the third component of the injection cylinder 41, a fourth movable chamber 46 is provided at the top end of the second rod body through-hole 45 of the injection cylinder 41, a locking insertion groove 48 connected to the external space is provided at the top end of the movable chamber 46 of the fourth component of the injection cylinder 41, and a second limit plate structure 410 capable of axially moving along the movable chamber 42 of the third component is placed inside the movable chamber 42 of the third component of the injection cylinder 41 , the bottom end of the No. 2 limit plate structure 410 is equipped with a valve stem 49 inserted into the medicine injection cavity 43, and a No. 3 coil spring 415 that can be in a stretched state is installed around the valve stem 49 and at the bottom end of the No. 2 limit plate structure 410. The top of the No. 2 limit plate structure 410 is fixedly equipped with a middle connecting rod structure 411 that passes through the No. 2 rod body through-hole 45, and the top of the middle connecting rod structure 411 is fixedly equipped with a polygonal locking column 412 located inside the No. 4 component movable cavity 46. The top edge area of ​​the polygonal locking column 412 is provided with an inclined surface structure 413 that approaches the center from bottom to top, and the center of the top of the polygonal locking column 412 is fixedly equipped with a longitudinal pull rod 414 that passes through the locking insertion groove 48. A No. 3 coil spring 415 is provided on one vertical surface of the polygonal locking column 412, and the No. 3 coil spring 415 supports the insertion of the locking head 39;

[0048] The outer circumferential surface of the injection barrel 41 is provided with a locking insertion hole 47 which is fixedly connected to the connecting plate structure 32 and is used for the insertion movement of the locking rod 38. The structural shape of the cross section of the movable cavity 46 of the fourth component is consistent with the structural shape of the cross section of the polygonal locking column 412, both of which are polygonal structures, and the structural dimensions of the cross section of the movable cavity 46 of the fourth component match the structural dimensions of the cross section of the polygonal locking column 412.

[0049] It should be noted that the bottom end of the No. 3 coil spring 415 is fixedly mounted on the bottom end of the No. 3 component movable cavity 42, and the top end is fixedly mounted on the bottom end of the No. 2 limit plate structure 410.

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

[0051] When in use, the longitudinal pull rod 414 is pulled upwards, so that the insulin is sucked into the medicine injection chamber 43 through the bottom open end of the medicine injection chamber 43 until the locking head 39 is inserted into the interior of the No. 3 coil spring 415. The patient holds the outer sleeve body 25 with his hand, and then presses the injection port of the syringe 41 on the injection skin and applies pressure to the skin. When the pressure is greater than the elastic strength of the No. 1 coil spring 210, the middle sleeve body 21 and the outer sleeve body 25 will undergo relative contraction. At this time, the liquid pressure inside the No. 1 component active chamber 26 will increase, generating a pressure toward the liquid docking soft tissue. When the elastic pressure entering the liquid docking hose 1 is greater than the elastic strength of the No. 2 coil spring 37 due to the flow trend in the tube 1, the No. 2 piston plate 36 will move to one side and continuously compress the No. 2 coil spring 37, so that the No. 2 piston plate 36 drives the locking rod 38 to move. When the locking head 39 is completely separated from the No. 3 coil spring 415, the valve stem 49 will generate pressure on the insulin located inside the drug injection chamber 43 under the action of the elastic force, 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 needle-free injection function.

[0052] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A needle-free intradermal syringe comprising a flexible liquid-connecting hose capable of directing the flow of liquid, characterized in that: Also includes, The pressure-adjustable grip mechanism comprises a hollow middle sleeve, an outer sleeve that fits over the middle sleeve and is gripped by the patient to apply downward pressure, a No. 1 coil spring that is positioned between the middle and outer sleeves and exerts elastic pressure on both, and a threaded sleeve that can adjust the initial positions of the middle and outer sleeves. And a liquid-driven locking mechanism connected to the pressure-adjustable grip mechanism through a liquid docking hose, which is internally provided with a horizontal hollow shell with a hollow interior, a locking rod placed inside the horizontal hollow shell and moving to one side when subjected to liquid pressure from an external sleeve body, and a No. 2 coil spring that can reset the locking rod.

2. The needle-free intradermal syringe according to claim 1, characterized in that The pressure-adjustable grip mechanism also includes a No. 1 piston plate, a center sleeve structure with open ends is provided at the center of the middle sleeve body, a No. 1 piston plate with an integral structure is provided in the middle area of ​​the middle sleeve body, a No. 1 component movable chamber is provided inside the outer sleeve body, a No. 2 component sleeve opening which can be placed on the periphery of the upper half area of ​​the middle sleeve body is provided at the top end of the outer sleeve body, the No. 1 piston plate is placed inside the No. 1 component movable chamber, a No. 1 coil spring in a compressed state is installed in the No. 1 component movable chamber in the area between the No. 1 piston plate and the inner wall of the top end of the outer sleeve body, and a connecting A No. 1 docking channel connecting the external space and the top of the movable cavity of component No. 1 is provided at the top of the outer sleeve body with a liquid compensation channel connecting the external space and the top of the movable cavity of component No. 1 and with a liquid valve installed inside. The bottom end of the middle sleeve body is provided with a No. 1 component sleeve with both ends open. The middle sleeve body is provided with a threaded sleeve capable of relative movement inside the No. 1 component sleeve. The top of the threaded sleeve is provided with a No. 1 limit plate structure which is an integral structure with it and can prevent the threaded sleeve from moving downward and detaching from the middle sleeve body. The center of the threaded sleeve is provided with an internal threaded hole installed on the periphery of the lower half structure of the middle sleeve body through a threaded structure.

3. The needle-free intradermal syringe according to claim 2, characterized in that The thread structure includes an internal thread structure arranged in the internal thread hole and an external thread structure arranged on the periphery of the lower half structure of the middle sleeve body, and the internal thread structure matches the external thread structure.

4. The needle-free intradermal syringe according to claim 3, characterized in that The outer circumferential side surface of the No. 1 piston plate and the sleeve opening of the No. 2 component are both embedded with sealing rings that can prevent liquid from flowing along the moving gap.

5. The needle-free intradermal syringe according to claim 4, characterized in that The liquid-driven locking mechanism also includes a No. 2 piston plate, one end of the horizontal hollow shell is provided with a connecting plate structure with an integral structure therewith, and a No. 2 component active chamber is provided inside the horizontal hollow shell, and the No. 2 component active chamber is provided with a liquid limiting flow chamber for liquid flow at one end close to the connecting plate structure, and one end of the horizontal hollow shell is provided with a No. 1 rod body through-hole connecting the external space and one end of the liquid limiting flow chamber, and the horizontal hollow shell is provided with a No. 2 piston plate capable of axially moving along the No. 2 component active chamber located inside the No. 2 component active chamber, and a locking rod that passes through the liquid limiting flow chamber and the No. 1 rod body through-hole is fixedly installed at one end of the No. 2 piston plate, and the locking rod is provided with a locking head with an integral structure therewith at one end located outside the horizontal hollow shell, and a No. 2 coil spring in a compressed state is provided at the other end of the No. 2 piston plate, and a No. 2 docking channel connecting the external space and the liquid limiting flow chamber is provided at the bottom of the horizontal hollow shell, and the No. 2 docking channel and the No. 1 docking channel are connected by a liquid docking hose.

6. The needle-free intradermal syringe according to claim 5, characterized in that The outer circumferential side surface of the No. 2 piston plate and the through hole of the No. 1 rod body are both embedded with sealing rings capable of preventing liquid from flowing along the moving gap.

7. The needle-free intradermal syringe according to claim 6, characterized in that The closed area formed by the No. 1 component active cavity, No. 1 piston plate, No. 1 docking channel, liquid docking hose, No. 2 docking channel, liquid limiting flow cavity and No. 2 piston plate is filled with buffer solution.

8. The needle-free intradermal syringe according to claim 7, characterized in that It also includes an elastic injection mechanism, which is equipped with a syringe fixedly installed inside the central sleeve structure and in a hollow interior, a valve stem placed inside the syringe and capable of compressing insulin and discharging it outward, a No. 3 coil spring that can apply downward pressure to the valve stem, and a polygonal locking column that can drive the valve stem to move and cooperate with the locking head to achieve locking.

9. The needle-free intradermal syringe according to claim 8, characterized in that The elastic injection mechanism also includes a longitudinal pull rod, the injection cylinder is fixedly installed inside the central sleeve structure, a movable cavity of component No. 3 is provided inside the injection cylinder, a medicine liquid injection cavity with an open bottom is provided at the bottom end of the movable cavity of component No. 3, a medicine liquid nozzle is installed at the bottom open end of the medicine liquid injection cavity, the injection cylinder is provided with a No. 2 rod body perforation at the top end of the movable cavity of component No. 3, the injection cylinder is provided with a movable cavity of component No. 4 at the top end of the No. 2 rod body perforation, the injection cylinder is provided with a locking insertion groove connected to the external space at the top end of the movable cavity of component No. 4, and the injection cylinder is provided with a No. 2 rod body perforation that can move axially along the movable cavity of component No. 3 inside the movable cavity of component No.

3. The limit plate structure, the bottom end of the No. 2 limit plate structure is equipped with a valve stem inserted into the medicine injection cavity, and a No. 3 coil spring that can be in a stretched state is installed around the valve stem at the bottom end of the No. 2 limit plate structure, and the top of the No. 2 limit plate structure is fixedly installed with a middle connecting rod structure that passes through the through-hole of the No. 2 rod body, and the top of the middle connecting rod structure is fixedly installed with a polygonal locking column located inside the movable cavity of the No. 4 component, and the top edge area of ​​the polygonal locking column is provided with an inclined surface structure that approaches the center from bottom to top, and the center of the top end of the polygonal locking column is fixedly installed with a longitudinal pull rod that passes through the locking insertion slot, and a No. 3 coil spring is provided on one vertical surface of the polygonal locking column, and a locking head is supported and inserted in the No. 3 coil spring; The outer circumferential surface of the injection cylinder is provided with a locking insertion hole which is fixedly connected to the connecting plate structure and is used for the insertion movement of the locking rod.

10. The needle-free intradermal syringe according to claim 9, characterized in that The structural shape of the cross section of the movable cavity of the fourth component is consistent with the structural shape of the cross section of the polygonal locking column, both of which are polygonal structures, and the structural dimensions of the cross section of the movable cavity of the fourth component match the structural dimensions of the cross section of the polygonal locking column.

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