A linear precision adjustment mechanism and needle-free syringe

Abstract

The present invention relates to the technical field of syringe dose adjustment, and discloses a linear precision adjustment mechanism and a needle-free syringe, wherein the adjustment mechanism comprises a mounting shell, a fixing portion is provided on the shell, and an inner cavity side wall of the fixing portion is provided with an internal thread; an adjustment shaft is cooperatively arranged in the fixing portion of the mounting shell, a matching portion is provided on the side wall of the shaft body, and an outer side wall of the matching portion is provided with an external thread; a driving cap is rotatably sleeved on the outside of the fixing portion and is cooperatively connected with the matching portion, and N positioning areas are evenly provided on the circumferential side wall of the driving cap; in the present invention, by providing matching threads between the mounting shell and the adjustment shaft, the linear movement of the adjustment shaft is promoted by the rotation of the driving cap, thereby maintaining a precise and stable linear output of the adjustment shaft, thereby promoting the precise movement of the piston in the cavity tube; and the rotation angle of the driving cap is correlated with the pitch displacement of the thread segment, and by providing a plurality of positioning areas, the control accuracy is improved, thereby realizing the control of the displacement of the rotational propulsion.

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 typically use high pressure to eject the injection solution into human tissue, thereby delivering medication. This makes them a safer, more hygienic, and more comfortable method of injection. Certain medical conditions, such as vitiligo treatment, scar treatment, and certain surgical anesthesia, require multiple injections at a single dose 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 the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0005] In view of the above-mentioned 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 significantly 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 adjusting shaft and a driving 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 adjusting 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 the internal thread is provided on the outer side wall of the matching portion; the driving cap is rotatably sleeved on the outside of the fixing portion and is connected with the matching portion, and N positioning areas are evenly provided 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, the adjustment shaft further includes an output shaft, and a driving groove is formed at the end of the mating 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 that matches 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, the axial length Z1 of the internal thread in the fixing portion is greater than the axial length Z2 of the external thread in the mating portion, but less than the sum Z3 of the axial lengths of the external thread and the plug-in block.

[0011] As a preferred solution of the linear precision adjustment mechanism described in the present invention, it also includes: no less than 2 groups of evenly distributed positioning parts, and the interval arc H2 of each group of the positioning parts is equal to M+0.5 times the arc H1 between adjacent positioning areas; 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 described in the present invention, wherein: mounting holes are provided 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 described in 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-mentioned linear precision adjustment mechanism to a needle-free syringe to achieve precise dosage adjustment of the needle-free syringe.

[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 pipe connected to the handle; a pneumatic mechanism, arranged inside the lumen assembly, which includes a pneumatic piston assembly and a pneumatic balance assembly cooperating therewith; an injection mechanism, which is arranged at the end of the lumen assembly, which includes a syringe, a needle assembly arranged at the end of the syringe, and a liquid inlet assembly arranged on the side wall of the syringe; a trigger mechanism, which is arranged in the handle assembly, which includes a safety buckle assembly and a trigger assembly cooperating 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 with the pitch displacement of the thread segment, and the control accuracy is improved by setting a number 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. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0022] Figure 1 Schematic diagram of the overall structure of the linear precision adjustment mechanism of the present invention.

[0023] Figure 2 Schematic diagram of the explosion separation structure of the linear precision adjustment mechanism of the present invention.

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

[0025] Figure 4 This is a schematic diagram of the overall PP surface cross-sectional planar structure of Example 2 of 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 7Schematic diagram of the coordination between the positioning area and the positioning member in Example 2 of the present invention.

[0029] Figure 8 This is a schematic diagram of the cooperation between the positioning area and the positioning member during rotation in Example 2 of the present invention.

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

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

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

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

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

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

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

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

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

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

[0040] Figure 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] Figure 20 This is a schematic diagram of the planar structure of the trigger mechanism and the handle of the needle-free syringe of the present invention.

[0042] Figures 21 to 26 This is a schematic diagram of the state changes during the use of the needle-free syringe of 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 embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. 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" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0046] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, 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 shell of a needle-free syringe or a part of the 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 lumen 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, which is used to adjust the installation of the shaft 200, and the whole is cylindrical and hollow inside.

[0050] The adjusting shaft 200 is arranged in cooperation with the fixing portion 101 of the mounting shell 100, and a matching portion 201 is provided on the side wall of the shaft body, and an external thread 201a that matches the internal thread 101a is provided on the outer wall of the matching portion 201; the adjusting shaft 200 also includes 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.

[0051] Among them, the adjusting 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 fitting portion 201 , a driving cap 300 is provided to be connected to the end of the fitting portion 201 ; specifically, the driving cap 300 is rotatably sleeved on the outside of the fixing portion 101 and is in cooperation with the fitting portion 201 .

[0053] A plug-in block 302 is located in the center of the driver cap 300, mating with the drive slot 201b. Its edge extends outside the fixed portion 101. It should be noted that because the plug-in block 302 drives the rotation of the mating portion 201, a rotational driving force is required. Therefore, the drive slot 201b can be shaped other than circular. The edge of the driver cap 300 extends and fits over the outside of the fixed portion 101, making it easier to rotate the driver cap 300 by hand.

[0054] Furthermore, the axial length Z1 of the internal thread 101a in the fixing portion 101 needs to be greater than the axial length Z2 of the external thread 201a in the mating portion 201, and the length distance greater than the axial length Z1 is the maximum movable displacement of the adjusting shaft 200; and the axial length Z1 of the internal thread 101a is less than the sum of the axial length Z2 of the external thread 201a and the axial length Z3 of the plug-in block 302, so as to prevent the plug-in block 302 from falling off from the driving groove 201b.

[0055] During use, by holding the outer wall of the driving cap 300 and turning it, the matching portion 201 can be rotated. Under the limiting action 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 4-11 , which is the second embodiment of the present invention, differs from the first embodiment in that, based on the first embodiment, it achieves precise and controllable adjustment of the displacement of the adjustment shaft 200. Therefore, N positioning areas 301 are evenly arranged on the circumferential sidewall of the drive cap 300, where N is a positive integer greater than 1.

[0058] There are also no less than two groups of evenly distributed positioning members 400 , and the interval arc H2 of each group of 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.

[0059] Specifically, the positioning member 400 includes a curved surface protrusion 401 and a tensioning 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 mounted 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 tensioning 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 side wall of the housing 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 members 400 is perpendicular to the axis of the driving cap 300 , a blocking annular groove 303 is provided on the edge sidewall of the driving cap 300 , and each positioning area 301 is distributed in the blocking annular groove 303 .

[0064] Compared to Example 1, a further embodiment achieves precise and controllable adjustment by providing positioning areas 301 and cooperating positioning members 400 on the circumferential sidewall edge of the driver cap 300. Specifically, the driver cap 300 rotates 360°, while the linear displacement W generated by the adjustment shaft 200 is fixed. For example, for each rotation of the driver cap 300, the adjustment shaft 200 is driven to produce a pitch length. Therefore, by controlling the driver cap 300 to produce a fixed arc, the displacement of the adjustment shaft 200 can be accurately controlled. Furthermore, N positioning areas 301 are evenly arranged on the inner or outer circumferential sidewall of the driver cap 300, equally dividing the 360° central angle. It should be noted that the larger the number N, that is, the smaller the arc between adjacent positioning areas 301, the more accurate the corresponding rotational adjustment arc, and thus the more precisely the displacement control of the adjustment shaft 200. Similarly, the larger the number N, the larger the radius of the outer wall of the driver cap 300. In this embodiment, the number N is preferably 40.

[0065] The positioning members 400 comprise at least two groups, each group having no fewer than two evenly distributed members, each capable of corresponding to a positioning zone 301. However, when all positioning members 400 in the first group correspond to a positioning zone 301, none of the positioning members in the second group 400 can correspond to a positioning member 400, i.e., they are located between adjacent positioning zones 301. Therefore, the arc distance H2 between the two groups of positioning members 400 is limited to (M + 0.5) times the arc distance H1 between adjacent positioning zones 301; where M is a positive integer greater than or equal to 0. This limitation further divides the arc distance between adjacent positioning zones 301, exponentially increasing the adjustable arc range and, therefore, improving the displacement adjustment accuracy of the adjustment shaft 200.

[0066] Specifically, when one set of positioning members 400 is provided, the adjustment accuracy of the adjustment shaft 200 is a linear displacement of W / N; when two sets of positioning members 400 are provided, the adjustment accuracy of the adjustment shaft 200 is a linear displacement of W / 2N; when three sets of positioning members 400 are provided, the adjustment accuracy of the adjustment shaft 200 is a linear displacement of W / 3N, and so on. In this embodiment, the positioning members 400 are preferably provided in two sets, each set having four positioning members 400, distributed at 90 degrees to maintain stable contact with the positioning area 301.

[0067] Furthermore, the positioning area 301 is not limited to being a concave pit A, and can also be configured in other forms such as scale slits, colors, patterns, etc. In this embodiment, a shallow concave pit is preferred. Combined with the arrangement of the curved protrusion 401 and the tensioning spring 402 in the positioning member 400, the curved surface of the curved protrusion 401 generates vibratory tactile feedback when the user frequently enters and exits the concave pit A, thereby improving the feel during control and adjustment.

[0068] Furthermore, the orientation of the positioning member 400 must be carefully considered. When the orientation of the positioning member 400 is parallel to the axis of the driver cap 300, the curved protrusion 401 and the tension spring 402 will push the housing of the driver cap 300 away from the adjustment shaft 200. This can cause the driver cap 300 to fall off during rotation. To address this, a retaining ring 103 is provided on the sidewall of the mounting housing 100. The retaining ring 103 is positioned between the mounting housing 100 and the sidewalls of the driver cap 300 to prevent the driver cap 300 from axial movement and potentially falling 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 ring 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 ring groove 303; during the adjustment process, one group of positioning members 400 is in an extended state and can be fitted into the pit A, and the other group of positioning members 400 is in an extruded state and is fitted into the blocking ring 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 13-26 , 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 Attachment Figure 16As shown in FIG, specifically, a first air vent 201c is formed in the axial sidewall of the mating portion 201, and a second air vent 304 is formed in the sidewall of the driving cap 300. A muffler plug X is installed in the second air vent 304. The first air vent 201c and the second air vent 304 are both used for exhaust, while the muffler plug X is used to reduce the sound during exhaust. A pneumatic outer cylinder 104 and a pneumatic inner cylinder 105 are also provided on the sidewall of the end of the mounting shell 100 away from the fixed portion 101, coaxially distributed with the fixed portion 101. The cavity between the two cylinders is used to install the pneumatic balancing assembly 602 in the pneumatic mechanism 600, thereby achieving a pneumatic injection effect. The axial length of the pneumatic outer cylinder 104 is greater than that of the pneumatic inner cylinder 105, forming an annular cavity H between the two cylinders. The pneumatic inner cylinder 105 and the fixed portion 101 are connected via a connecting hole 106. An air groove 107 is further 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 communicating hole 106 , but a gap for ventilation is still left in the hole.

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

[0076] The 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 .

[0077] The pneumatic mechanism 600 is disposed inside the cavity 501 and includes a pneumatic piston assembly 601 and a pneumatic balancing 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] Furthermore, the housing mechanism 500 in the needle-free syringe is combined with the attached Figures 13-15The lumen 501 is divided into a hollow interior, a handle 502 connected to the lumen 501, and an air inlet pipe 503 connected to the handle 502. The lumen 501 is a main body, hollow inside. Along the axial direction of the lumen 501, one end of the sidewall is provided with an injection connection port 501a, and the other end is provided with a mounting shell connection port 501b. The pneumatic outer cylinder 104 and the pneumatic inner cylinder 105 of the mounting shell 100 are assembled within the mounting shell connection port 501b. The air groove 107 in the outer wall of the pneumatic outer cylinder 104 forms an airway for transmitting high-pressure gas. The lumen 501 is hollow inside, forming a receiving chamber M. The sidewalls of the receiving chamber M are provided with annularly distributed protrusions T. When the piston cylinder 601a is installed in the receiving chamber M, it is supported by the protrusions T, thereby preventing contact with the sidewalls of the lumen 501.

[0081] Furthermore, the grip 502 is integrally formed on the sidewall of the lumen 501, extending perpendicularly or at a certain angle to the axial direction of the lumen 501. To facilitate gripping, the grip 502 is preferably connected to the lumen 501 at an angle. A safety catch mounting area 502a and a trigger mounting area 502b are provided on the sidewall of the gripping area of ​​the grip 502, for mounting the safety catch assembly 801 and the trigger assembly 802 in the trigger mechanism 800. The two mounting areas are connected by a connecting groove 502c. Specifically, the interior of the grip 502 is hollow, forming an air chamber N for storing high-pressure gas. The air chamber N has an air inlet connected to an air inlet pipe 503 for admitting high-pressure gas from the outside. Furthermore, the accommodating chamber M and the air chamber N are connected by a connecting air passage L and a balancing air passage P, and the trigger mounting area 502b is connected to the balancing air passage P.

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

[0083] Combined with attachment Figure 14 、 16 and 17, for the pneumatic mechanism 600, the whole is assembled inside the cavity tube 501, which includes a pneumatic piston assembly 601 and a pneumatic balance assembly 602 cooperating 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 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] The piston cylinder 601a limits the radial diameter and range of motion of the piston block 601b; the first spring 601c resets the piston block 601b after movement. The push rod 601b-1 propels the push slider 701b within the syringe 701, squeezing and delivering the medication. It should be noted that the piston cylinder 601a, push rod 601b-1, and push slider 701b can also be an integrated structure, which will not be further described here.

[0086] The pneumatic balancing assembly 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 defined in the axial sidewall of the balancing valve block 602a. These vent holes 602a-1 are used to discharge the high-pressure gas within the piston cylinder 601a through the connecting hole 106 and the bleed hole. A first sealing gasket 602a-2 is provided on the sidewall of the balancing valve block 602a, distal from the annular cavity H. This first sealing gasket 602a-2 provides both cushioning and sealing functions. It contacts the sidewall of the piston cylinder 601a, allowing the high-pressure gas within the piston cylinder 601a to separate and be discharged after work is completed.

[0088] A second sealing gasket 602a-3 is provided at the bottom of the pneumatic inner cylinder 105. This 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 is able to 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. 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, thereby adjusting the injection dose.

[0090] It should be noted that the maximum radial diameter of the piston cylinder 601a is no greater than the maximum radial diameter of the first sealing gasket 602a-2. This is intended to allow the high-pressure gas within the accommodating chamber M to propel the piston block 601b within the piston cylinder 601a. ​​Due to the different cross-sections of the chambers, 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 remains constant during injection. Furthermore, the cross-sections of the accommodating chamber M and the piston cylinder 601a are significantly larger than the cross-sectional area of ​​the syringe 701. Therefore, a relatively low gas pressure can be used to generate a relatively high pressure on the medication within the syringe 701, ultimately achieving the effect of high-pressure injection of the medication from the needle 702a.

[0091] Combined with attachment Figure 14 and 18 As for the injection mechanism 700, it is integrally mounted on the end of the cavity 501, and includes a syringe 701, a needle assembly 702 arranged at the end of the syringe 701, and a liquid inlet assembly 703 arranged on the side wall of the syringe 701; wherein, the syringe 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 liquid; and the liquid inlet assembly 703 is used to introduce the medicine required for injection into the syringe 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, which is used 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 entry of the medicine into 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 kept in communication with 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 a smooth and precise pushout of a certain amount of medicine.

[0094] The needle assembly 702 is installed in conjunction 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; the protective cap 702c is used to protect the needle 702a.

[0095] The liquid inlet assembly 703 is installed in conjunction 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 in 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 install the medicine tube G for the medicine. When the medicine tube G is inserted, the valve core of the one-way valve group 703a will be sealed at the output port of the medicine tube G, so that the medicine in the tube cannot be discharged. 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 define 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 Figure 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, controlling the pneumatic process and providing 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 mounted on the side wall of the handle 502, and the unlocking slider 801a is required to slide linearly along the extension direction of the handle 502. One side wall is required to contact a human finger and is the contact end. The surface opposite this end is the mounting surface and is connected to the connecting block 801b. The two can be an integrated structure or a separate structure. In the case of a separate 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 controlled by controlling the movement of the connecting block 801b. Furthermore, the positioning bolt 801c limits the connecting block 801b to the side wall of the handle 502. However, due to the presence of the upper limit groove 801b-1 on the connecting block 801b, the connecting block 801b can slide a distance equal to the length of the limit groove 801b-1, and the unlocking slider 801a can also slide a distance equal to the length of the limit groove 801b-1. In order to further improve the stability of the connecting block 801b during 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 connecting block 801b controls the range of movement of the trigger button 802a via a limiting protrusion 801d-1 on the limiting rod 801d. Specifically, the limiting rod 801d is slidably disposed within the connecting slot 502c, and the limiting rod 801d is limited in position by the connecting block 801b. By changing the position of the connecting 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, and therefore the movement path of the limiting rod 801d is as perpendicular as possible to the movement path of the trigger assembly 802. That is, the top of the connecting block 801b should drive the limiting rod 801d to produce a linear displacement. However, the extension direction of the grip 502 is inclined, so the contact plane between the limiting rod 801d and the connecting block 801b should be 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 catch 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; among them, 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 connector 802a-1 is provided at one end of the trigger button 802a away from the pressing surface; a matching female connector 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. 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 connector 802a-1 can be matched and connected to the matching female connector 802b-1, and the transition air chamber 802b-2 is connected to the air chamber N through the air inlet nozzle J and is passed through. It is connected to the balance air channel 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. A sealing ring 802c-2 is installed on the side wall of the air hole push rod 802c near one end of the cone head 802c-1; the return spring 802d is arranged between the matching female seat 802b-1 and the trigger button 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 placed horizontally 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 realize the on-off of the air source; and 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 female connector 802b-1 are matched, and the plug-in length of the two can be changed; when the plug-in length is the longest, the plug-in length is 0. When the trigger button 802a is small, the trigger button 802a has no effect on the air hole push rod 802c; when the trigger button 802a pushes the air hole push rod 802c, the insertion depth increases, and at this time, a misalignment occurs between the connecting male head 802a-1 and the matching female seat 802b-1. 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 air hole push rod 802c, and is used for gas sealing at the perforation C.

[0103] Combined with attachment Figures 13-26 As shown in , 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 gas source for use. That is, the input end of the air inlet pipe 503 is connected to the external gas source. At the same time, the medicine tube G of the medicine to be injected is inserted into the liquid pipe adjustment frame 703b, the required needle 702a is installed, and then the external protective cap 702c is removed.

[0105] In the initial state, if Figure 21As shown in ; For the linear precision adjustment mechanism, the drive cap 300 drives the adjustment shaft 200 to the initial position. At this time, the adjustment shaft 200 is in the target position. 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, which pulls the balance valve block 602a to be in the annular cavity H; the first spring 601c is at its original length, which 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 the external gas source is connected, 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 enter the transition air chamber 802b-2 from the air inlet nozzle J, and then enter the air groove 107 from the balancing air channel P, and then enter 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 surface 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 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. Figure 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. At the same time, the limiting rod 801d is pushed to produce 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, it is pushed to move toward the connecting tube 802b, and the insertion depth of the connecting male connector 802a-1 and the matching female connector 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 into the annular cavity H is blocked. At this time, the sealing ring 802c-2 no longer blocks the perforation C. The annular cavity H will be connected to the outside atmosphere through the air hole Q, the air groove 107, the balancing air channel P, the transition air chamber 802b-2, the perforation C and the misaligned matching female connector 802b-1. However, 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 extreme end of the annular chamber H, and 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. Since the pressure inside the piston cylinder 601a is low, the piston block 601b will be pushed by the high-pressure gas toward the piston cylinder 601a to move to the side of the injection tube 701. The first spring 601c is compressed at the same time, and the propulsion slider 701b connected to the propulsion rod 601b-1 moves synchronously into the liquid storage chamber Y, quickly pushing the medicine in the liquid storage chamber Y toward the needle assembly 702. Under the action of the needle core 702b and the needle 702a, the medicine is quickly ejected; the medicine injection process is completed; as shown in the attached figure Figure 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 connector 802a-1 and the matching female connector 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 annular cavity H again, and the balancing 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 relief hole 201c, and the second air relief hole 304, the space in the piston cylinder 601a is connected to the outside atmosphere, and the piston block 601b will gradually return to its initial position under the action of the first spring 601c. During this 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 to the external atmosphere through the vent hole 602a-1, the connecting hole 106, the first air relief hole 201c, and the second air relief hole 304. At the same time, during the recovery process of the piston block 601b, the push slider 701b will also be pulled back to its initial position. Figure 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. Figure 25 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 26 As shown in .

[0109] To adjust the dosage of the injected medication, the drive cap 300 can be rotated to indirectly drive the linear displacement of the adjustment shaft 200, thereby changing the position of the piston block 601b. This, in turn, changes the displacement distance of the piston block 601b, thereby changing the injection distance of the push slider 701b. The advantage of this solution is that, by providing the positioning area 301 and multiple (two) sets of offset positioning members 400, the arc of the positioning area 301 is cleverly increased, thereby improving the accuracy of the injection dosage adjustment.

[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 and are not intended to limit the present invention. 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 by: include, A mounting 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 provided on a side wall of the shaft body, and an external thread (201a) matching with the internal thread (101a) being provided on an outer side wall of the matching portion (201); A driving cap (300) is rotatably sleeved on the outside of the fixing portion (101) and is engaged with the engaging portion (201), and has N positioning areas (301) evenly arranged on its circumferential side wall, wherein N is a positive integer greater than 1; It also includes at least one group of evenly distributed positioning members (400), wherein the interval arc H2 of each group of 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.

2. The linear precision adjustment mechanism according to claim 1, characterized in that: The adjusting 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: The middle portion of the driving cap (300) is provided with a plug-in block (302) that matches the driving slot (201b), and the 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: The positioning member (400) comprises a curved surface protrusion (401) and a tensioning spring (402) connected thereto.

6. The linear precision adjustment mechanism according to claim 5, 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).

7. The linear precision adjustment mechanism according to claim 6, characterized in that: The positioning area (301) is correspondingly formed with a recess (A), and the end of the curved surface protrusion (401) away from the tensioning spring (402) can be fitted and embedded in the recess (A).

8. The linear precision adjustment mechanism according to claim 7, 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.

9. The linear precision adjustment mechanism according to any one of claims 6 to 8, characterized in that: When the distribution direction of the positioning member (400) is perpendicular to the axis of the driving cap (300), a blocking ring 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 ring groove (303).

10. A continuous needle-free syringe, characterized in that: The method comprises the linear precision adjustment mechanism according to any one of claims 1 to 9, further comprising: The 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 disposed inside the cavity (501), comprising a pneumatic piston assembly (601) and a pneumatic balancing assembly (602) cooperating therewith; An injection mechanism (700) is provided at the end of the cavity (501), comprising an injection tube (701), a needle assembly (702) provided at the end of the injection tube (701), and a liquid inlet assembly (703) provided on the side wall of the injection tube (701); The trigger mechanism (800) is arranged in the grip (502), and comprises a safety catch assembly (801) and a trigger assembly (802) connected thereto.

Images