Linear precise adjusting mechanism and needleless injector

Abstract

The invention relates to the technical field of syringe dosage adjustment, and discloses a linear precise adjusting mechanism and a needleless syringe, the adjusting mechanism comprises a mounting shell, a fixing part is arranged on a shell body of the adjusting mechanism, and an internal thread is arranged on the side wall of an inner cavity of the fixing part; the adjusting shaft is arranged in the fixing part of the mounting shell in a matched mode, a matching part is arranged on the side wall of a shaft body of the adjusting shaft, and external threads are arranged on the outer side wall of the matching part; the driving cap is rotationally arranged outside the fixing part in a sleeving manner and is connected with the matching part in a matching manner, and N positioning areas are uniformly arranged on the circumferential side wall of the driving cap; the matched threads are arranged between the mounting shell and the adjusting shaft, linear movement of the adjusting shaft is pushed through rotation of the driving cap, accurate and stable linear output of the adjusting shaft can be kept, and therefore a piston in the cavity pipe is pushed to move accurately; and the rotation angle of the driving cap corresponds to the pitch displacement of the threaded section in a correlated manner, and a plurality of positioning areas are arranged to improve the control precision, so that the displacement of rotary propulsion is controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of syringe dosage adjustment, and in particular to a linear precision adjustment mechanism and a needle-free syringe. Background Art

[0002] Needle-free syringes are syringes that do not require a needle. They usually use high pressure to spray the injection into human tissue to achieve drug administration. It is a safer, more hygienic and more comfortable way of injection. Some diseases require multiple injections, such as vitiligo treatment, scar treatment, and some surgical anesthesia. Multiple injections are required for one loading of medicine to facilitate the operation of medical staff.

[0003] However, some existing needle-free syringes have problems such as complex dosage adjustment from the first injection to the last injection and inaccurate control of small doses; therefore, it is necessary to solve the dosage adjustment problems of existing needle-free syringes. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems existing in the micro-dose adjustment of the existing needle-free syringe, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a linear precision adjustment mechanism for a needle-free syringe, which aims to solve the problem of how to simplify the dosage adjustment process of the needle-free syringe and greatly improve the accuracy of dosage adjustment.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a linear precision adjustment mechanism, which includes a mounting shell, an adjustment shaft and a drive cap, wherein the mounting shell is provided with a fixing portion on its shell body, and an internal thread is provided on the inner cavity side wall of the fixing portion; the adjustment shaft is cooperatedly arranged in the fixing portion of the mounting shell, and a matching portion is provided on the side wall of the shaft body, and an external thread matching with the internal thread is provided on the outer side wall of the matching portion; the drive cap is rotatably sleeved on the outside of the fixing portion and is connected with the matching portion, and N positioning areas are evenly arranged on its circumferential side wall, wherein N is a positive integer greater than 1.

[0008] As a preferred solution of the linear precision adjustment mechanism of the present invention, wherein: the adjustment shaft also includes an output shaft, and a driving groove is formed at the end of the matching portion away from the output shaft.

[0009] As a preferred solution of the linear precision adjustment mechanism of the present invention, a plug-in block matching with the driving groove is provided in the middle of the driving cap, and its edge extends outside the fixing portion.

[0010] As a preferred solution of the linear precision adjustment mechanism of the present invention, wherein: the axial length Z of the internal thread in the fixing portion is 1 Greater than the axial length Z of the external thread in the mating portion 2 , but less than the sum of the axial lengths Z of the external thread and the plug-in block 3 .

[0011] As a preferred solution of the linear precision adjustment mechanism of the present invention, it also includes at least 2 groups of evenly distributed positioning members, and the interval arc H of each group of positioning members is 2 The arc H between adjacent positioning areas is equal to M+0.5 times 1 ; Wherein, M is a positive integer greater than or equal to 0.

[0012] As a preferred solution of the linear precision adjustment mechanism of the present invention, the positioning member includes a curved surface protrusion and a tensioning spring connected thereto.

[0013] As a preferred solution of the linear precision adjustment mechanism of the present invention, wherein: mounting holes are arranged on the shell side wall of the mounting shell, the number of the mounting holes corresponds to the number of the positioning members, and each of the positioning members is correspondingly installed in each of the mounting holes.

[0014] As a preferred solution of the linear precision adjustment mechanism of the present invention, a pit is formed corresponding to the positioning area, and the end of the curved protrusion away from the tensioning spring can be fitted and embedded in the pit.

[0015] As a preferred solution of the linear precision adjustment mechanism of the present invention, when the distribution direction of the positioning member is parallel to the axis of the driving cap, a retaining ring is further provided on the shell side wall of the mounting shell, and the retaining ring prevents the driving cap from generating axial movement.

[0016] As a preferred solution of the linear precision adjustment mechanism of the present invention, when the distribution direction of the positioning member is perpendicular to the axis of the driving cap, a blocking ring groove is provided on the edge side wall of the driving cap, and each of the positioning areas is distributed in the blocking ring groove.

[0017] Another object of the present invention is to apply the above linear precision adjustment mechanism to a needle-free injector to achieve precise dosage adjustment of the needle-free injector.

[0018] In order to solve the above technical problems, the present invention provides the following technical solutions: a continuous needle-free syringe, which includes the above-mentioned linear precision adjustment mechanism, and also includes a shell mechanism, which is divided into a lumen, a handle connected to the lumen, and an air inlet duct connected to the handle; a pneumatic mechanism, which is arranged inside the lumen assembly, and includes a pneumatic piston assembly and a pneumatic balance assembly matched therewith; an injection mechanism, which is arranged at the end of the lumen assembly, and includes an injection tube, a needle assembly arranged at the end of the injection tube, and a liquid inlet assembly arranged on the side wall of the injection tube; a trigger mechanism, which is arranged in the handle assembly, and includes a safety buckle assembly and a trigger assembly matched therewith.

[0019] Beneficial effects of the present invention:

[0020] In the present invention, a matching thread is set between the mounting shell and the adjusting shaft, and the linear movement of the adjusting shaft is driven by the rotation of the driving cap, so that the precise and stable linear output of the adjusting shaft can be maintained, thereby driving the precise movement of the piston in the cavity tube; and the rotation angle of the driving cap is correlated and corresponding to the pitch displacement of the thread segment, and the control accuracy is improved by setting a plurality of positioning areas, thereby realizing the control of the displacement of the rotational propulsion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0022] Figure 1 It is a schematic diagram of the overall structure of the linear precision adjustment mechanism of the present invention.

[0023] Figure 2 It is a schematic diagram of the explosion separation structure of the linear precision adjustment mechanism of the present invention.

[0024] Figure 3 It is a schematic diagram of the overall half-section structure of Example 1 of the present invention.

[0025] Figure 4 It is a schematic diagram of the overall PP surface cross-sectional plan structure of Example 2 in the present invention.

[0026] Figure 5 Schematic diagram of the separation structure of the driving cap and the mounting shell in Example 2 of the present invention.

[0027] Figure 6 It is a three-dimensional cross-sectional schematic diagram of the overall assembly state of Example 2 of the present invention.

[0028] Figure 7It is a schematic diagram of the coordination between the positioning area and the positioning member in Example 2 of the present invention.

[0029] Figure 8 It is a schematic diagram of the cooperation between the positioning area and the positioning member when rotating in Example 2 of the present invention.

[0030] Fig. 9 This is a schematic diagram of another distribution method of the positioning areas in Example 2 of the present invention.

[0031] Fig.10 It is a schematic diagram of the sectional three-dimensional structure when the positioning member and the rotating cap of Example 2 of the present invention are axially vertically distributed.

[0032] Fig.11 for Fig. 9 A partial enlarged schematic diagram of the combined state.

[0033] Fig.12 for Fig. 9 Schematic diagram of the coordination structure between the positioning area and the positioning piece in the assembled state.

[0034] Fig.13 This is a schematic diagram of the overall structure of the needle-free syringe in Example 3 of the present invention.

[0035] Fig.14 It is a schematic diagram of the overall cross-sectional plan structure of the needle-free syringe in the present invention.

[0036] Fig.15 It is a schematic diagram of the shell structure of the needle-free syringe in the present invention.

[0037] Fig.16 It is a schematic diagram of the connection structure of the adjustment mechanism and the pneumatic balancing component of the needle-free syringe in the present invention.

[0038] Fig.17 It is a schematic diagram of the pneumatic mechanism connection structure of the needle-free syringe in the present invention.

[0039] Fig.18 It is a schematic diagram of the structure of the needle assembly of the needle-free syringe in the present invention.

[0040] Fig.19 It is a schematic diagram of the three-dimensional structure of the trigger mechanism of the needle-free syringe in the present invention.

[0041] Fig. 20 It is a schematic diagram of the planar structure of the trigger mechanism and the handle of the needle-free syringe in the present invention.

[0042] Figure 21 to Figure 26 The figure is a schematic diagram of the state changes during the use of the needle-free syringe in the present invention. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] 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 term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0046] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0047] Example 1

[0048] Reference Figures 1 to 3 , which is the first embodiment of the present invention, provides a linear precision adjustment mechanism, which includes a mounting shell 100, an adjustment shaft 200 and a drive cap 300, wherein the mounting shell 100 is specifically the outer shell of a needle-free syringe or a part of the outer shell, the adjustment shaft 200 is installed inside the mounting shell 100, and is used to promote the movement of the piston block in the cavity of the needle-free syringe, and the drive cap 300 is connected between the mounting shell 100 and the adjustment shaft 200, and is used to drive the movement of the adjustment shaft 200.

[0049] Specifically, the mounting shell 100 is provided with a fixing portion 101 on the shell, and an internal thread 101a is provided on the inner cavity side wall of the fixing portion 101; it should be noted that the fixing portion 101 is a part of the needle-free syringe shell, used for the installation of the adjustment shaft 200, and is cylindrical as a whole and hollow inside.

[0050] The adjusting shaft 200 is arranged in cooperation with the fixing part 101 of the mounting shell 100, and a matching part 201 is arranged on the side wall of the shaft body, and an external thread 201a matching with the internal thread 101a is arranged on the outer wall of the matching part 201; the adjusting shaft 200 also includes an output shaft 202, and a driving groove 201b is provided at the end of the matching part 201 away from the output shaft 202.

[0051] Among them, the adjustment shaft 200 is divided into a connected matching part 201 and an output shaft 202 along its axial direction. The output shaft 202 passes through the fixed part 101 and extends into the cavity of the needle-free syringe. The matching part 201 is matched with the internal thread 101a through the external thread 201a to control the linear displacement of the output shaft 202.

[0052] Furthermore, in order to facilitate the rotation of the driving matching portion 201 , a driving cap 300 is provided to be connected to the end of the matching portion 201 ; specifically, the driving cap 300 is rotatably sleeved on the outside of the fixing portion 101 and is matched and connected with the matching portion 201 .

[0053] A plug-in block 302 matching the driving slot 201b is provided in the middle of the driving cap 300, and its edge extends outside the fixing portion 101. It should be noted that since the plug-in block 302 drives the matching portion 201 to rotate, a driving force in the rotation direction needs to be provided, so the driving slot 201b can be in other shapes besides circular; and the edge of the driving cap 300 extends and sleeves on the outside of the fixing portion 101, which is convenient for hand-held twisting of the driving cap 300 for rotation operation.

[0054] Furthermore, the axial length Z of the internal thread 101a in the fixing portion 101 is 1 It must be greater than the axial length Z of the external thread 201a in the mating portion 201 2 , and the length greater than is the maximum displacement of the adjusting shaft 200; and the axial length Z of the internal thread 101a 1 Smaller than the axial length Z of the external thread 201a 2 and the axial length Z of the plug-in block 302 3 The sum of the lengths is used to prevent the plug-in block 302 from falling off from the driving slot 201b.

[0055] During use, the outer wall of the driving cap 300 is held and rotated to drive the matching portion 201 to rotate. Under the limiting effect of the internal thread 101a of the fixing portion 101, the output shaft 202 can generate a stable linear displacement.

[0056] Example 2

[0057] Reference Figures 4 to 11 , which is the second embodiment of the present invention, and this embodiment is different from the first embodiment in that: on the basis of the first embodiment, the displacement of the adjusting shaft 200 is precisely and controllably adjusted. Therefore, N positioning areas 301 are evenly arranged on the circumferential side wall of the driving cap 300, where N is a positive integer greater than 1.

[0058] There are also at least two groups of evenly distributed positioning members 400, and the interval arc H of each group of positioning members 400 is 2The arc H between adjacent positioning areas 301 is equal to M+0.5 times 1 ; Wherein, M is a positive integer greater than or equal to 0.

[0059] Specifically, the positioning member 400 includes a curved surface protrusion 401 and a tension spring 402 connected thereto.

[0060] The side wall of the mounting shell 100 is provided with mounting holes 102 . The number of the mounting holes 102 corresponds to the number of the positioning members 400 , and each positioning member 400 is correspondingly installed in each mounting hole 102 .

[0061] A concave pit A is formed corresponding to the positioning area 301 , and the end of the curved protrusion 401 away from the tension spring 402 can be fitted and embedded in the concave pit A.

[0062] When the distribution direction of the positioning member 400 is parallel to the axis of the driving cap 300 , a retaining ring 103 is further provided on the shell side wall of the mounting shell 100 , and the retaining ring 103 prevents the driving cap 300 from generating axial movement.

[0063] When the distribution direction of the positioning member 400 is perpendicular to the axis of the driving cap 300 , a blocking annular groove 303 is provided on the edge side wall of the driving cap 300 , and each positioning area 301 is distributed in the blocking annular groove 303 .

[0064] Compared with Example 1, further, the effect of precise controllable adjustment is obtained by setting a positioning area 301 and a positioning member 400 matched therewith on the edge of the circumferential side wall of the driving cap 300. In detail, the driving cap 300 rotates one circle for 360°, and the linear displacement W generated by the adjusting shaft 200 is fixed; if the driving cap 300 rotates one circle, the adjusting shaft 200 is driven to generate a pitch length, so when the driving cap 300 is controlled to generate a certain arc, the displacement of the adjusting shaft 200 can be accurately controlled. Furthermore, N positioning areas 301 are evenly set on the inner or outer side wall of the circumference of the driving cap 300, and the central angle of 360° is equally divided. It should be noted that the larger the number of N, that is, the smaller the arc between adjacent positioning areas 301, the more accurate the arc amount of the corresponding rotation adjustment, and at this time, the more accurate the displacement control of the adjusting shaft 200. Similarly, the larger the number of N, the larger the radius of the outer side wall of the driving cap 300 is required. In this embodiment, the number of N is preferably 40.

[0065] The positioning members 400 include at least two groups, each group is set to have no less than two and evenly distributed, and each can correspond to a positioning area 301; however, when the first group of positioning members 400 all correspond to the positioning areas 301, the second group of positioning members 400 cannot correspond to the positioning members 400, that is, they are located between adjacent positioning areas 301. Therefore, the interval arc H between the two groups of positioning members 400 is limited. 2Equal to (M+0.5) times the arc H between adjacent positioning areas 301 1 ; Wherein, M is a positive integer greater than or equal to 0. This limiting method will further divide the arc between adjacent positioning areas 301, which can double the adjustable arc value range, that is, improve the displacement adjustment accuracy of the adjustment shaft 200.

[0066] Specifically, it can be understood that: when there is one group of positioning members 400, the adjustment accuracy of the adjustment shaft 200 is the linear displacement W / N; when there are two groups of positioning members 400, the adjustment accuracy of the adjustment shaft 200 is the linear displacement W / 2N; when there are three groups of positioning members 400, the adjustment accuracy of the adjustment shaft 200 is the linear displacement W / 3N, and so on, which will not be described in detail. In this embodiment, the positioning members 400 are preferably two groups, each group of positioning members 400 has four positioning members 400, which are distributed at 90 degrees to maintain stability when in contact with the positioning area 301.

[0067] Furthermore, the positioning area 301 is not limited to the pit A, and can also be set to other forms such as scale slits, colors, graphics, etc. In this embodiment, a shallow pit form is preferred, and with the arrangement of the curved protrusion 401 and the tension spring 402 in the positioning member 400, the curved surface of the curved protrusion 401 forms a vibration tactile feedback when frequently entering and exiting each pit A, thereby improving the feel during control and adjustment.

[0068] In addition, it is necessary to further pay attention to the distribution direction of the positioning member 400. When the distribution direction of the positioning member 400 is parallel to the axis of the driving cap 300, the curved protrusion 401 and the tension spring 402 will push the housing of the driving cap 300, making it tend to move away from the adjustment shaft 200, and in the process of rotating the driving cap 300, the driving cap 300 will fall off. For this reason, a retaining ring 103 is provided on the housing side wall of the mounting shell 100. The retaining ring 103 is limited between the mounting shell 100 and the side wall of the driving cap 300 to prevent the driving cap 300 from generating axial movement and causing the driving cap 300 to fall off.

[0069] When the distribution direction of the positioning members 400 is perpendicular to the axis of the driving cap 300, each positioning member 400 can be distributed on the inner side or outer side relative to the side wall of the driving cap 300. In order to improve the control accuracy of the adjusting shaft 200, the number of positioning areas 301 should be increased as much as possible. Therefore, it is preferred to set the positioning members 400 on the outer side relative to the side wall of the driving cap 300; more preferably, the positioning members 400 point vertically to the side wall of the driving cap 300 and the pit A on the side wall, which will have a limiting effect on the driving cap 300 and prevent the driving cap 300 from axial displacement; in order to further prevent the driving cap 300 from displacement, a blocking annular groove 303 can be provided on the edge side wall of the driving cap 300, and each positioning area 301 is distributed in the blocking annular groove 303; during the adjustment process, one group of positioning members 400 is in an extended state and can be fitted in the pit A, and the other group of positioning members 400 is in an extruded state and is fitted in the blocking annular groove 303. The blocking effect of the positioning member 400 on the side wall of the driving cap 300 can be enhanced without affecting the rotation of the driving cap 300 itself, thereby simplifying the overall structure of the adjustment mechanism and improving the overall effect.

[0070] Example 3

[0071] Reference Figures 13 to 26 , which is the third embodiment of the present invention. This embodiment is different from the previous two embodiments in that the linear precision adjustment mechanism proposed in the previous two embodiments is applied to a needle-free syringe to greatly improve the performance of the existing needle-free syringe.

[0072] Therefore, a needle-free syringe is specifically provided, which includes the linear precision adjustment mechanism in the above-mentioned embodiments 1 and 2. Furthermore, in order to make the above-mentioned linear precision adjustment mechanism adaptable to the use of the needle-free syringe, the following feature changes are added to the mounting shell 100, the adjustment shaft 200 and the drive cap 300.

[0073] Reference Fig.16As shown in , specifically, a first air leakage hole 201c is also provided in the axial side wall of the matching part 201, a second air leakage hole 304 is provided in the side wall of the driving cap 300, and a muffler X is installed in the second air leakage hole 304. Among them, the first air leakage hole 201c and the second air leakage hole 304 are both used for exhaust, and the muffler X is used to reduce the sound during exhaust. A pneumatic outer cylinder 104 and a pneumatic inner cylinder 105 coaxially distributed with the fixing part 101 are also provided on the end side wall of the mounting shell 100 away from the fixing part 101. The cavity between the two cylinders is used for the installation of the pneumatic balance component 602 in the pneumatic mechanism 600 to form the effect of pneumatic injection. The axial length of the pneumatic outer cylinder 104 is greater than the axial length of the pneumatic inner cylinder 105, and an annular cavity H is formed between the two cylinders; the pneumatic inner cylinder 105 and the fixing part 101 are connected through a connecting hole 106. An air groove 107 is also provided on the outer ring side wall of the pneumatic outer cylinder 104 . An air hole Q is opened in the air groove 107 so as to communicate with the annular cavity H between the pneumatic outer cylinder 104 and the pneumatic inner cylinder 105 .

[0074] It should be noted that the output shaft 202 of the adjustment shaft 200 passes through the connecting hole 106, but a ventilating gap is still left in the hole.

[0075] In addition, combined with Fig.14 As shown in, the needle-free syringe also includes the following structure:

[0076] The shell structure 500 is divided into a cavity 501 , a handle 502 connected to the cavity 501 , and an air intake pipe 503 connected to the handle 502 .

[0077] The pneumatic mechanism 600 is disposed inside the cavity tube 501 and includes a pneumatic piston assembly 601 and a pneumatic balance assembly 602 cooperating therewith;

[0078] The injection mechanism 700 is arranged at the end of the cavity 501 , and includes an injection tube 701 , a needle assembly 702 arranged at the end of the injection tube 701 , and a liquid inlet assembly 703 arranged on the side wall of the injection tube 701 .

[0079] The trigger mechanism 800 is disposed in the grip 502, and includes a safety catch assembly 801 and a trigger assembly 802 connected thereto.

[0080] Further, the housing mechanism 500 in the needle-free syringe, in combination with the attached Figures 13-15, which is divided into a cavity 501, a handle 502 connected to the cavity 501, and an air intake pipe 503 connected to the handle 502; wherein the cavity 501 is a main body, which is hollow inside. Along the axial direction of the cavity 501, one end of the side wall is set as an injection connection port 501a, and the other end is set as a mounting shell connection port 501b. The pneumatic outer cylinder 104 and the pneumatic inner cylinder 105 of the mounting shell 100 are assembled in the mounting shell connection port 501b. At this time, the gas groove 107 in the outer wall of the pneumatic outer cylinder 104 forms an airway, which can be used for the transmission of high-pressure gas. The inner cavity of the cavity 501 is hollow, forming a receiving chamber M, and annularly distributed protrusions T are arranged on the side wall of the receiving chamber M; when the piston cylinder 601a is installed in the receiving chamber M, it is supported by the protrusions T, thereby avoiding contact with the side wall of the cavity 501.

[0081] Further, the grip 502 is integrated on the side wall of the cavity 501, and its extension direction is perpendicular to the axial direction of the cavity 501 or presents a certain angle. In order to be suitable for human hand holding, the grip 502 is preferably connected to the cavity 501 obliquely; the side wall of the grip 502 hand-held area is provided with a safety buckle installation area 502a and a trigger installation area 502b, which are used for installing the safety buckle assembly 801 and the trigger assembly 802 in the trigger mechanism 800, and the two installation areas are connected through a connecting groove 502c. Specifically, the interior of the grip 502 is hollow, and an air chamber N is formed to store high-pressure gas; the air chamber N has an air inlet, which is connected to the air inlet pipe 503 for introducing external high-pressure gas; further, the accommodating cavity M and the air chamber N are kept in communication through the connecting airway L and the balance airway P, and the trigger installation area 502b is kept in communication with the balance airway P.

[0082] It should be noted that when the mounting shell 100 is assembled on the mounting shell connection port 501 b , the balancing air passage P is communicated with the air groove 107 opened in the outer side wall of the pneumatic outer cylinder 104 .

[0083] Combined with Fig.14 , 16 And 17, for the pneumatic mechanism 600, it is assembled as a whole inside the cavity tube 501, which includes a pneumatic piston assembly 601 and a pneumatic balance assembly 602 matched therewith; the pneumatic piston assembly 601 is driven by high-pressure gas to push the injection mechanism 700 to perform the injection step; the pneumatic balance assembly 602 is used in conjunction with the pneumatic piston assembly 601 to reset it and remove the high-pressure gas after doing work.

[0084] Specifically, the pneumatic piston assembly 601 is installed in the accommodating chamber M, and includes a piston cylinder 601a, a piston block 601b arranged in the piston cylinder 601a, and a first spring 601c connected to the piston block 601b. The end of the first spring 601c away from the piston block 601b is connected to the side wall of the accommodating chamber M.

[0085] Among them, the piston cylinder 601a limits the radial diameter and the range of motion of the piston block 601b; the first spring 601c is used to reset the piston block 601b after it moves. The push rod 601b-1 pushes the push slider 701b to move in the injection tube 701 to squeeze and output the medicine. It should be noted that the piston cylinder 601a, the push rod 601b-1 and the push slider 701b can also be an integrated structure, which will not be described in detail here.

[0086] The pneumatic balancing component 602 is arranged in the annular cavity H, and includes a balancing valve block 602a and a second spring 602b connected thereto; wherein the balancing valve block 602a is a T-shaped rotating body as a whole, and its two ends are respectively slidably limited in the pneumatic outer cylinder 104 and the pneumatic inner cylinder 105; at this time, the annular cavity H is isolated from the inner cavity area of ​​the pneumatic inner cylinder 105.

[0087] Furthermore, a plurality of vent holes 602a-1 are provided in the axial side wall of the balancing valve block 602a, and the vent holes 602a-1 are used to discharge the high-pressure gas in the piston cylinder 601a, so that the high-pressure gas is discharged through the connecting hole 106 and the air leakage hole. A first sealing gasket 602a-2 is provided on the side wall of the end of the balancing valve block 602a away from the annular cavity H. The first sealing gasket 602a-2 is used for buffering and sealing, and can contact the side wall of the end of the piston cylinder 601a, so that the high-pressure gas in the inner cavity of the piston cylinder 601a can be separated after the work is done, and then it can be discharged conveniently.

[0088] A second sealing gasket 602a-3 is provided at the bottom of the pneumatic inner cylinder 105. The second sealing gasket 602a-3 is also used for buffering and sealing. When it contacts the end of the balancing valve block 602a, it will block the vent hole 602a-1 to form a seal; when separated, it can be used to exhaust the vent hole 602a-1.

[0089] The output shaft 202 passes through the middle side wall of the balancing valve block 602a and extends into the accommodating chamber M, and can contact the piston block 601b. Preferably, a sealing buffer pad D is installed on the side wall of the piston cylinder 601a facing the pneumatic balancing component 602, and the end of the output shaft 202 can abut against the sealing buffer pad D, thereby limiting the staying position of the piston block 601b, that is, realizing the adjustment of the injection dose.

[0090] It should be noted that the maximum radial diameter of the piston cylinder 601a is not greater than the maximum radial diameter of the first sealing gasket 602a-2. The purpose is to push the piston block 601b in the piston cylinder 601a to move through the high-pressure gas in the accommodating chamber M. Since the cross-sections of the chambers are different, and according to the gas pressure calculation formula: F=PA, where P represents pressure, F represents force, and A represents the cross-sectional area of ​​the chamber, the force will not change during injection, and the cross-sections of the accommodating chamber M and the piston cylinder 601a are much larger than the cross-sectional area of ​​the injection tube 701. Therefore, a smaller gas pressure can generate a larger pressure on the medicine in the injection tube 701, and finally achieve the effect of high-pressure injection of the medicine from the needle 702a.

[0091] Combined with Fig.14 and 18 The injection mechanism 700 is integrally mounted on the end of the cavity 501, and includes an injection tube 701, a needle assembly 702 disposed on the end of the injection tube 701, and a liquid inlet assembly 703 disposed on the side wall of the injection tube 701; wherein the injection tube 701 is used for the installation of the needle assembly 702 and the liquid inlet assembly 703, and for accommodating medicine; the needle assembly 702 is used for high-pressure output of the medicine; and the liquid inlet assembly 703 is used for introducing the medicine required for injection into the injection tube 701.

[0092] Specifically, one end of the injection tube 701 is threadedly assembled in the injection connection port 501a of the cavity tube 501, and the other end is set as a needle interface 701a. A propulsion slider 701b is slidably set in the injection tube 701 to propel the medicine in the injection tube 701; and a liquid inlet interface 701c is set on the side wall of the injection tube 701. Preferably, the liquid inlet interface 701c is set at an angle, and its purpose is to facilitate the medicine to enter the liquid storage cavity Y of the injection tube 701.

[0093] Furthermore, the tubular cavity between the needle interface 701a and the pushing slider 701b forms a liquid storage chamber Y, and the liquid inlet interface 701c is connected to the liquid storage chamber Y; the pushing slider 701b is connected to the end of the pushing rod 601b-1 away from the piston block 601b, and the movement of the piston block 601b indirectly drives the movement of the pushing slider 701b to achieve smooth and accurate release of a certain amount of medicine.

[0094] The needle assembly 702 is installed in cooperation with the needle interface 701a, and includes a needle 702a, a needle core 702b arranged in the injection tube 701 and the needle 702a, and a protective cap 702c arranged at the output end of the needle 702a; wherein the needle 702a is used to realize the atomization discharge of the medicine; the needle core 702b is used to deliver the high-pressure liquid medicine to the needle 702a; and the protective cap 702c is used to protect the needle 702a.

[0095] The liquid inlet assembly 703 is installed in cooperation with the liquid inlet interface 701c, and includes a one-way valve group 703a arranged in the liquid inlet interface 701c, a liquid pipe adjustment frame 703b with one end inserted in the liquid inlet interface 701c, and a limit nut 703c arranged on the liquid pipe adjustment frame 703b and threadedly connected to the outer wall of the liquid inlet interface 701c; wherein, the one-way valve group 703a is used to limit the one-way flow of the medicine from the outside of the syringe into the injection tube 701; the liquid pipe adjustment frame 703b is used to insert the medicine tube G for installing the medicine. When the medicine tube G is inserted, the valve core of the one-way valve group 703a will be blocked at the output port of the medicine tube G, so that the medicine in the tube cannot be discharged, and when the valve core of the one-way valve group 703a is driven by the negative pressure in the injection tube 701, the negative pressure will adsorb the medicine in the medicine tube G into the liquid storage chamber Y. The limiting nut 703c is used to limit the installation position of the liquid pipe adjustment frame 703b so that it can adapt to different types of medicine tubes G.

[0096] For the trigger mechanism 800 in this needle-free syringe, in combination with the attached Fig.18 and 19 As shown, it is arranged on the side wall of the handle 502, and mainly includes a safety buckle assembly 801 and a trigger assembly 802 connected thereto; wherein, the safety buckle assembly 801 needs to be used in conjunction with the trigger assembly 802 to form a structural protection for the trigger assembly 802 to prevent accidental operation, while the trigger assembly 802 is used to control high-pressure gas and is regarded as the switch component of the syringe to control the pneumatic process and provide trigger power for the injection process.

[0097] Specifically, the safety buckle assembly 801 is installed in the safety buckle installation area 502a, and includes an unlocking slider 801a, a connecting block 801b, a positioning bolt 801c, a limiting rod 801d and a limiting spring 801e; wherein, the connecting block 801b is arranged on the side wall of the unlocking slider 801a, the positioning bolt 801c passes through the limiting groove 801b-1 set in the side wall of the connecting block 801b and is fixed on the side wall of the safety buckle installation area 502a, the limiting rod 801d slides in the connecting groove 502c, one end of which contacts the end side wall of the connecting block 801b, and the other end is provided with a limiting protrusion 801d-1, the limiting spring 801e is connected between the safety buckle installation area 502a and the limiting rod 801d, and is mounted on the outer wall of the limiting rod 801d.

[0098] It should be noted that the safety buckle assembly 801 is installed on the side wall of the handle 502, and the unlocking slider 801a needs to slide linearly along the extension direction of the handle 502; one side wall needs to contact with human fingers, which is the contact end, and the opposite surface of this end is the installation surface, which is connected to the connecting block 801b. The two can be an integrated structure or a split structure. When it is a split structure, the combination of the two is not specifically limited; the connecting block 801b and the unlocking slider 801a move synchronously, and the movement of the unlocking slider 801a can be limited by controlling the movement of the connecting block 801b. Furthermore, the positioning bolt 801c limits the connecting block 801b on the side wall of the handle 502, but due to the existence of the upper limit groove 801b-1 of the connecting block 801b, the connecting block 801b can generate a sliding distance of the length of the limit groove 801b-1, so the unlocking slider 801a will also be able to slide the distance of the length of the limit groove 801b-1. In order to further improve the stability of the connecting block 801b when sliding, guiding ribs A are provided on both sides of the connecting block 801b, and corresponding guide grooves are provided in the safety buckle installation area 502a; no detailed description is given here.

[0099] Furthermore, the connection block 801b controls the movement range of the trigger button 802a through the limiting protrusion 801d-1 on the limiting rod 801d; specifically, the limiting rod 801d is slidably set in the connection groove 502c, and the limiting rod 801d is limited by the connection block 801b. By changing the position of the connection block 801b, the limiting protrusion 801d-1 is driven to block the movement path of the trigger button 802a. It should be noted that in this embodiment, the trigger assembly 802 moves linearly, so the movement path of the limiting rod 801d is as perpendicular to the movement path of the trigger assembly 802 as possible, that is, the top of the connection block 801b should drive the limiting rod 801d to produce a linear displacement, but the extension direction of the grip 502 is inclined, so the contact plane between the limiting rod 801d and the connection block 801b should be kept parallel to the movement direction of the trigger assembly 802. The limiting spring 801e is sleeved on the limiting rod 801d to keep the safety buckle assembly 801 in the initial protection state as much as possible. When the trigger assembly 802 is used, this protection state should be broken.

[0100] As for the trigger assembly 802, it is installed in the trigger installation area 502b, and includes a trigger button 802a, a connecting tube 802b, an air hole push rod 802c and a return spring 802d; wherein, the trigger button 802a is triggered by a human finger, and the connecting tube 802b cooperates with the air hole push rod 802c to control the high-pressure air circuit; the return spring 802d is used to control the state of the air hole push rod 802c to restore it to its initial state.

[0101] Specifically, a connecting male head 802a-1 is provided at one end of the trigger button 802a away from the pressing surface; a matching female seat 802b-1 is provided at one end of the connecting tube 802b, and a transition air chamber 802b-2 is provided in the other end of the tube, and the two are connected through a through hole C, and an air inlet nozzle J and an exhaust hole K are provided in the side wall of the transition air chamber 802b-2. The connecting male head 802a-1 can be matched and connected in the matching female seat 802b-1, and the transition air chamber 802b-2 is connected with the air chamber N through the air inlet nozzle J, and is connected to the air chamber N through the air inlet nozzle J. It is connected to the balance airway P through the exhaust hole K; the air hole push rod 802c crosses the through hole C, one end extends into the transition air chamber 802b-2, and contacts the air inlet nozzle J through the cone head 802c-1, and the other end extends into the matching female seat 802b-1, and a sealing ring 802c-2 is sleeved on the side wall of the air hole push rod 802c close to one end of the cone head 802c-1; the reset spring 802d is arranged between the matching female seat 802b-1 and the trigger buckle 802a, and is sleeved on the outer side wall of the air hole push rod 802c.

[0102] Among them, the connecting tube 802b is fixed in the trigger installation area 502b, and the air hole push rod 802c is horizontally placed in the connecting tube 802b. The cone head 802c-1 at its end can cooperate with the air inlet nozzle J of the transition air chamber 802b-2 to block the air source. The air hole push rod 802c is driven by the trigger button 802a and the return spring 802d. The male connector 802a-1 and the matching female connector 802b-1 are matched, and the plug-in length of the two is variable. When the plug-in length is the longest, When the trigger button 802a is small, the trigger button 802a has no effect on the pore push rod 802c; when the trigger button 802a pushes the pore push rod 802c, the insertion depth increases, and at this time, the connecting male head 802a-1 and the matching female seat 802b-1 are misaligned. At this time, the inner cavity of the connecting tube 802b is connected to the external atmosphere, which can be used to form a pressure difference between the ring cavity H and the accommodating cavity M; the sealing ring 802c-2 is mounted on the pore push rod 802c, which is used for gas sealing at the perforation C.

[0103] Combined with Figures 13 to 26 As shown in the figure, the needle-free syringe has the following usage process during use:

[0104] Before use, the product needs to be inspected to ensure that it is in good condition; when the product is in good condition, it can be connected to an external air source for use, that is, the input end of the air inlet pipe 503 is connected to the external air source; at the same time, the medicine tube G of the medicine to be injected is inserted into the liquid tube adjustment frame 703b, the required needle 702a is installed, and then the external protective cap 702c is removed.

[0105] In the initial state, if Fig.21As shown in ; for the linear precision adjustment mechanism, the drive cap 300 drives the adjustment shaft 200 to the initial position, at which time the adjustment shaft 200 is in the target position, and correspondingly, the amount of medicine output by the pneumatic piston assembly 601 to the needle assembly 702 is constant; the second spring 602b is at its original length, and it pulls the balance valve block 602a to be in the annular cavity H; the first spring 601c is at its original length, and it pushes the piston block 601b to be located in the piston cylinder 601a and on the side closest to the balance valve block 602a; for the injection mechanism 700, the one-way valve group 703a blocks The liquid outlet of the medicine tube G; in the trigger mechanism 800, the unlocking slider 801a of the safety buckle assembly 801 is at the uppermost end of the limiting groove 801b-1. At this time, the limiting protrusion 801d-1 at the end of the limiting rod 801d is located within the forward stroke of the trigger buckle 802a, hindering the trigger buckle 802a from being pulled. Under the action of the reset spring 802d, the trigger buckle 802a and the air hole push rod 802c are in an untriggered state, the cone head 802c-1 of the air hole push rod 802c does not contact the air inlet nozzle J, and the sealing ring 802c-2 seals the perforation C.

[0106] When connected to an external gas source, the high-pressure gas will quickly fill the internal cavity of the needle-free syringe, first filling the air chamber N, and then filling the accommodating cavity M outside the piston cylinder 601a through the connecting air channel L, and at the same time entering the transition air chamber 802b-2 from the air inlet nozzle J, and then entering the air groove 107 from the balancing air channel P, and then entering the annular cavity H through the air hole Q; under the action of the high-pressure gas, in the annular cavity H, the balancing valve block 602a will stretch the second spring 602b and move to the edge of the piston cylinder 601a, and contact with the end of the piston block 601b, and the space between the contact surfaces of the balancing valve block 602a and the piston block 601b is eliminated. Even if there is air, it will be discharged through the exhaust channel formed by the vent hole 602a-1, the connecting hole 106, the first air leakage hole 201c, and the second air leakage hole 304, as shown in the attached figure. Fig. 22 as shown in .

[0107] Before pulling the trigger button 802a, the unlocking slider 801a needs to be pushed to move along the extension direction of the grip 502, and at the same time, the limiting rod 801d is pushed to produce a linear movement, and the limiting protrusion 801d-1 at its end will be disengaged from the forward displacement of the trigger button 802a; at this time, the trigger button 802a can be pulled. When the trigger button 802a is pulled, the trigger button 802a is pushed to move toward the connecting tube 802b, and the insertion depth of the connecting male head 802a-1 and the matching female seat 802b-1 gradually deepens. With continuous pushing, the trigger button 802a will contact the end of the air hole push rod 802c and push the air hole push rod 802c to move horizontally; when the cone head 802c-1 of the air hole push rod 802c contacts the air inlet nozzle J, the air path entering the annular cavity H is blocked. At this time, the sealing ring 802c-2 no longer blocks the perforation C, and the annular cavity H will be connected to the outside atmosphere through the air hole Q, the air groove 107, the balancing airway P, the transition air chamber 802b-2, the perforation C and the misaligned matching female seat 802b-1; while the accommodating cavity M is still filled with high-pressure gas. Due to the huge pressure difference on both sides of the balancing valve block 602a, the balancing valve block 60 2a will push the high-pressure gas in the accommodating chamber M to the end of the annular chamber H, the balancing valve block 602a and the piston block 601b will be separated, the space between the two will be filled with high-pressure gas, and the vent hole 602a-1 will be blocked by the second sealing gasket 602a-3; the high-pressure gas in the accommodating chamber M cannot leak out, at this time, the high-pressure gas contacts the piston block 601b, and since the inside of the piston cylinder 601a is at low pressure, the piston block 601b will be pushed by the high-pressure gas to move to the piston cylinder 601a on the side of the injection tube 701, the first spring 601c will be compressed at the same time, and the pushing slider 701b connected to the pushing rod 601b-1 will move synchronously into the liquid storage chamber Y, and the medicine in the liquid storage chamber Y will be quickly pushed to the needle assembly 702, and the medicine will be quickly sprayed out under the action of the needle core 702b and the needle 702a; the medicine injection process is completed; as shown in the attached Fig.23 as shown in .

[0108] Then the syringe enters the reset state, and the finger stops pulling the trigger button 802a. Under the action of the reset spring 802d, the trigger button 802a and the air hole push rod 802c are restored to the initial state. At this time, the connecting male head 802a-1 and the matching female seat 802b-1 return to the minimum insertion depth again, the cone head 802c-1 of the air hole push rod 802c is separated from the air inlet nozzle J, and the sealing ring 802c-2 blocks the perforation C again. The high-pressure gas enters the ring cavity H again, and the balance valve block 602a is pushed to the edge of the contact with the piston cylinder 601a again. The sealing effect of the first sealing gasket 602a-2 separates the space in the piston cylinder 601a from the accommodating cavity M. , under the action of the exhaust channel formed by the vent hole 602a-1, the connecting hole 106, the first air leakage hole 201c, and the second air leakage hole 304, the space in the piston cylinder 601a is connected to the outside atmosphere, and the piston block 601b will gradually return to the initial position under the action of the first spring 601c. During the process, the gas in the piston cylinder 601a that has done work on the piston block 601b will be gradually discharged by the piston block 601b, that is, discharged from the vent hole 602a-1, the connecting hole 106, the first air leakage hole 201c, and the second air leakage hole 304 to the external atmosphere. At the same time, during the recovery process of the piston block 601b, the push slider 701b will also be pulled back to the initial position; as shown in the attached figure Fig.24 As the push slider 701b moves in the injection tube 701, negative pressure is generated in the tube. Under the action of negative pressure, the one-way valve group 703a is opened, and the medicine in the medicine tube G is sucked out and replenished into the liquid storage cavity Y, forming automatic liquid replenishment. Fig.25 As shown in the figure. To facilitate the next injection. When the medicine tube G is used up, just pull it out and replace it. Finally, the syringe returns to its initial state, as shown in the attached figure. Fig.26 as shown in .

[0109] For adjusting the dosage of the injected medicine, the linear displacement of the adjusting shaft 200 can be indirectly driven by rotating the driving cap 300, that is, the position of the piston block 601b is changed, and correspondingly, the displacement distance of the piston block 601b is changed, that is, the injection distance of the push slider 701b is changed. The advantage of this solution is that by setting the positioning area 301 and multiple groups (2 groups) of offset positioning members 400, the division arc of the positioning area 301 is cleverly improved, that is, the dosage accuracy value of the injection adjustment is improved.

[0110] In summary, this needle-free syringe has the advantages of simple operation, continuous operation, and precise adjustment of injection dosage.

[0111] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A linear precision adjustment mechanism, characterized in that: include, An installation shell (100) is provided with a fixing portion (101) on its shell, and an inner cavity side wall of the fixing portion (101) is provided with an internal thread (101a); An adjusting shaft (200) is arranged in cooperation with the fixing portion (101) of the mounting shell (100), a matching portion (201) being arranged on the side wall of the shaft body, and an outer wall of the matching portion (201) being arranged with an outer thread (201a) matching with the inner thread (101a); The driving cap (300) is rotatably sleeved on the outside of the fixing portion (101) and is connected to the matching portion (201). N positioning areas (301) are evenly arranged on its circumferential side wall, wherein N is a positive integer greater than 1.

2. The linear precision adjustment mechanism according to claim 1, characterized in that: The adjustment shaft (200) further comprises an output shaft (202), and a driving groove (201b) is provided at the end of the matching portion (201) away from the output shaft (202).

3. The linear precision adjustment mechanism according to claim 2, characterized in that: A plug-in block (302) matching the driving groove (201b) is provided in the middle of the driving cap (300), and an edge of the plug-in block (302) extends outside the fixing portion (101).

4. The linear precision adjustment mechanism according to claim 3, characterized in that: The axial length Z1 of the internal thread (101a) in the fixing portion (101) is greater than the axial length Z2 of the external thread (201a) in the matching portion (201), but less than the sum of the maximum axial lengths of the external thread (201a) and the plug-in block (302).

5. The linear precision adjustment mechanism according to any one of claims 1 to 4, characterized in that: It also includes at least one group of uniformly distributed positioning members (400), wherein the interval arc H2 of each group of the positioning members (400) is equal to M+0.5 times the arc H1 between adjacent positioning areas (301); wherein M is a positive integer greater than or equal to 0.

6. The linear precision adjustment mechanism according to any one of claims 1 to 4, characterized in that: The positioning member (400) comprises a curved surface convex block (401) and a tensioning spring (402) connected thereto.

7. The linear precision adjustment mechanism according to claim 6, characterized in that: The side wall of the mounting shell (100) is provided with mounting holes (102), the number of the mounting holes (102) corresponds to the number of the positioning members (400), and each positioning member (400) is correspondingly mounted in each mounting hole (102).

8. The linear precision adjustment mechanism according to claim 7, characterized in that: The positioning area (301) is correspondingly formed with a concave pit (A), and the end of the curved surface protrusion (401) away from the tension spring (402) can be fitted and embedded in the concave pit (A).

9. The linear precision adjustment mechanism according to claim 8, characterized in that: When the distribution direction of the positioning member (400) is parallel to the axis of the driving cap (300), a retaining ring (103) is further provided on the shell side wall of the mounting shell (100), and the retaining ring (103) prevents the driving cap (300) from generating axial movement.

10. The linear precision adjustment mechanism according to any one of claims 7 to 9, characterized in that: When the distribution direction of the positioning member (400) is perpendicular to the axis of the driving cap (300), a blocking annular groove (303) is provided on the edge side wall of the driving cap (300), and each of the positioning areas (301) is distributed in the blocking annular groove (303).

11. A continuous needle-free injector, characterized in that: It comprises the linear precision adjustment mechanism as claimed in any one of claims 1 to 10, and further comprises: A housing structure (500) is divided into a cavity (501), a handle (502) connected to the cavity (501), and an air intake pipe (503) connected to the handle (502); A pneumatic mechanism (600) is arranged inside the cavity tube assembly (501), and comprises a pneumatic piston assembly (601) and a pneumatic balance assembly (602) matched therewith; An injection mechanism (700) is arranged at the end of the cavity tube (501), comprising an injection tube (701), a needle assembly (702) arranged at the end of the injection tube (701), and a liquid inlet assembly (703) arranged on the side wall of the injection tube (701); The trigger mechanism (800) is arranged in the handle (502), and comprises a safety catch assembly (801) and a trigger assembly (802) connected thereto.

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