Adjustable large dose mesoplastic boosting device and injection device

Abstract

The application relates to the technical field of medical equipment and discloses an adjustable large-dose beauty-plastic boosting device and an injection device, which comprise a gun body, a striker and a stroke adjusting module. The striker is arranged in the gun body in an axially movable mode and comprises a firing section, a piston section, a tail rod section and a first limiting shoulder which are sequentially arranged along the axis. The piston section is in sealing cooperation with a piston cavity, a firing channel is matched with the firing section, and the firing channel and / or the piston cavity is provided with a gas guide hole in communication with the outside at one end close to the firing channel. The stroke adjusting module comprises a stroke adjusting sleeve which is sleeved on the outer periphery of the tail rod section and is in screw connection with the gun body. The stroke adjusting sleeve is provided with an axially extending accommodating groove, and the first limiting shoulder is accommodated in the accommodating groove. By rotating the stroke adjusting sleeve to change the axial position of the stroke adjusting sleeve, the abutting position of the first limiting shoulder and the stroke adjusting sleeve can be adjusted, so that the firing stroke of the striker is changed. The beauty-plastic boosting device can reduce the number of liquid suction times and save needleless injection tools.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an adjustable high-dose mesotherapy booster and injection device. Background Technology

[0002] In the field of aesthetic medicine, the use of needle-free technologies such as high-pressure jet injection and electromagnetic infusion to deliver nutrients or medications into the skin has become a popular practice. The mesotherapy booster device, used to connect to the needle-free injector, is the main driving and control device for non-invasive delivery.

[0003] Most needleless injectors on existing Meco booster devices are single-use, which is not environmentally friendly. When different body parts of the same consumer need injections, if different needleless injectors are used for each part, the operator needs to draw liquid and install each injector, which consumes a lot of materials and is time-consuming. If the same needleless injector is used for all parts, the operator still needs to frequently draw liquid from the injector, which is cumbersome and affects injection efficiency.

[0004] Therefore, it is necessary to provide a Mesotherapy booster device that can reduce the number of aspirations and save on needle-free injection equipment. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an adjustable high-dose mesotherapy booster device that can reduce the number of aspirations and save needleless injection equipment.

[0006] To solve the above technical problems, the present invention provides an adjustable high-dose mesotherapy booster device, including a gun body, a firing pin and a stroke adjustment module. The gun body has an air inlet chamber, a piston chamber, a firing channel and a valve chamber. The air inlet chamber is configured to be connected to an air inlet pipe and communicates with the piston chamber through a first vent hole. The valve chamber is provided with a control valve for controlling the opening and closing of the first vent hole. The firing pin is axially movable within the gun body and includes a firing section, a piston section, a tail rod section, and a first limiting shoulder arranged sequentially along the axial direction. The piston section is sealed to the piston chamber, the firing channel is adapted to the firing section, and the firing channel and / or the piston chamber near the firing channel is provided with a gas vent communicating with the outside. The stroke adjustment module includes a stroke adjustment sleeve sleeved on the outer periphery of the tail rod section and threadedly connected to the gun body. The stroke adjustment sleeve has an axially extending receiving groove, and the first limiting shoulder is received in the receiving groove. By rotating the stroke adjustment sleeve to change its axial position, the contact position between the first limiting shoulder and the stroke adjustment sleeve can be adjusted, thereby changing the firing stroke of the firing pin.

[0007] As an improvement to the above solution, the receiving groove has a bottom wall, and the first limiting shoulder is configured to abut against the bottom wall when moving towards the stroke adjusting sleeve.

[0008] As an improvement to the above solution, a first buffer pad is provided in the receiving groove, which is positioned opposite to the first limiting shoulder. The first buffer pad moves axially synchronously with the rotation of the stroke adjusting sleeve relative to the gun body; or The first limiting shoulder is provided with a first buffer pad that is opposite to the bottom wall of the receiving groove.

[0009] As an improvement to the above solution, the stroke adjustment module further includes a sleeve fitted around the outer periphery of the gun body and connected to the stroke adjustment sleeve, and a scale adjustment sleeve connected to the sleeve and / or the stroke adjustment sleeve. The outer peripheral surface of the scale adjustment sleeve is provided with anti-slip texture and / or a structure for tool engagement. The outer wall of the gun body tail end is provided with marking scale along the axial direction.

[0010] As an improvement to the above solution, the gun body includes a main body, a cylinder, a front cover, a rear cover, and a stroke fixing sleeve. The front cover, the cylinder, and the rear cover are sequentially connected to the main body. The stroke fixing sleeve is connected to the rear cover. The firing section extends from the cylinder into the front cover. The piston is in sealed contact with the cylinder. The tail rod section extends from the cylinder into the rear cover and the stroke fixing sleeve. The rear cover is provided with a first sealing element that seals with the tail rod section. The marking scale is provided on the outer wall surface of the stroke fixing sleeve. The stroke adjustment sleeve extends into the stroke fixing sleeve and is threadedly connected to the stroke fixing sleeve.

[0011] As an improvement to the above solution, the sleeve is provided with a stop at one end near the rear cover, and the travel fixing sleeve is provided with a second limiting shoulder at one end away from the rear cover. The sleeve is fitted from the end away from the stop at one end of the travel fixing sleeve away from the end away from the second limiting shoulder, and the second limiting shoulder slides in cooperation with the inner wall of the sleeve.

[0012] As an improvement to the above solution, a return spring is also included, which is sleeved outside the firing section, with the opposite ends of the return spring abutting against the front cover and the piston section, respectively.

[0013] As an improvement to the above solution, the firing channel is located on the front cover, and the end of the firing channel near the piston chamber is provided with a second sealing element for sealing cooperation with the firing section. The front cover is provided with a first air guide hole connecting the piston chamber to the outside, and the front cover is provided with a second air guide hole connecting the firing channel to the outside outside outside the stroke of the firing section.

[0014] As an improvement to the above solution, the piston chamber is provided with a second buffer pad sleeved on the outer periphery of the tail rod section, and the second buffer pad abuts against the piston; The tail rod section has a detachable end head at its end, and the first limiting shoulder is formed on the end head.

[0015] In addition, the present invention also provides an injection device, which includes the above-mentioned adjustable high-dose mesotherapy booster device and a needle-free injector. The needle-free injector includes an injection cylinder connected to the front cover and a push rod extending into the firing channel. The gun body is provided with markings corresponding to the scale lines on the injection cylinder.

[0016] Implementing this invention has the following beneficial effects: This invention discloses an adjustable high-dose mesotherapy booster device. The axial position of the booster is changed by rotating the stroke adjustment sleeve, thereby altering the firing stroke of the firing pin. When connected to a needle-free injector, the liquid drawn in a single injection can be used multiple times, allowing the disposable needle-free injector to be used multiple times on different parts of the same person or animal. This reduces the number of times the operator needs to draw liquid and saves on needle-free injection equipment consumption. Because the liquid in the needle-free injector can be injected in multiple doses via the mesotherapy booster device, the dosage of liquid drawn in a single injection is increased, and the stroke of the firing pin is variable for each injection, enabling flexible dosage adjustments. The mesotherapy booster device helps a single needle-free injector achieve adjustable dosage injection after drawing a large dose of liquid in a single injection, significantly improving injection efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an embodiment of an adjustable high-dose mesotherapy booster device of the present invention and the installation structure of a needleless injector; Figure 2 yes Figure 1 A sectional view; Figure 3 yes Figure 2 A magnified structural diagram of section C; Figure 4 This is a schematic diagram of the structure before; Figure 5 This is a schematic diagram of the cylinder structure; Figure 6 It is a schematic diagram of the firing section, piston section, and tail rod section of the firing pin; Figure 7 This is a structural diagram of the back cover; Figure 8 yes Figure 2 A schematic diagram of the structure during firing pin activation; Figure 9 yes Figure 2A schematic diagram of the structure after the firing pin has been reset (retracted); Figure 10 yes Figure 2 A schematic diagram of the structure before the initial firing of the firing pin, with the single injection dose adjusted to 0.5 ml. Figure 11 yes Figure 2 A schematic diagram of the structure when the single injection dose is adjusted to 0.5 ml and the firing pin is fired for the first time; Figure 12 yes Figure 2 A schematic diagram of the structure before the second firing of the firing pin, with the single injection dose adjusted to 0.5 ml. Figure 13 yes Figure 2 A schematic diagram of the structure when the single injection dose is adjusted to 0.5 ml and the firing pin fires for the second time; Figure 14 yes Figure 2 A schematic diagram of the structure before the third firing of the firing pin, with the single injection dose adjusted to 0.5 ml. Figure 15 yes Figure 2 A schematic diagram of the structure when the single injection dose is adjusted to 0.5 ml and the firing pin fires for the third time; Figure 16 yes Figure 2 A schematic diagram of the structure before the fourth firing of the firing pin, with the single injection dose adjusted to 0.5 ml. Figure 17 yes Figure 2 A schematic diagram of the structure when the single injection dose is adjusted to 0.5 ml and the firing pin fires for the fourth time. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] like Figures 1 to 4As shown, this invention discloses an embodiment of an adjustable high-dose mesotherapy booster device, including a gun body 1, a firing pin 2, and a stroke adjustment module 3. The gun body 1 has an air inlet chamber a, a piston chamber b, a firing channel c, and a valve chamber d. The air inlet chamber a is configured to connect to an air inlet pipe and communicates with the piston chamber b through a first vent hole e. The valve chamber d is provided with a control valve 4 that controls the opening and closing of the first vent hole e. The firing pin 2 is axially movable within the gun body 1 and includes a firing section 21, a piston section 22, a tail rod section 23, and a first limiting shoulder 241 arranged sequentially along the axial direction. The piston section 22 is sealed to the piston chamber b. The firing channel c is adapted to the firing section 21. The firing channel c and / or the piston chamber b are provided with a gas duct at one end near the firing channel c, which communicates with the outside. The stroke adjustment module 3 includes a stroke adjustment sleeve 31 sleeved on the outer periphery of the tail rod section 23 and threadedly connected to the gun body 1. The stroke adjustment sleeve 31 is provided with an axially extending receiving groove 311, and the first limiting shoulder 241 is received in the receiving groove 311. By turning the stroke adjustment sleeve 31 to change its axial position, the contact position between the first limiting shoulder 241 and the stroke adjustment sleeve 31 can be adjusted, thereby changing the firing stroke of the firing pin 2.

[0020] In this embodiment, the axial position of the stroke adjustment sleeve 31 is changed by screwing it on, thereby changing the firing stroke of the firing pin 2. After the Meso booster device is connected to the needleless injector, the liquid drawn up once in the needleless injector can be used multiple times in an adjustable manner. This allows the disposable needleless injector to be used multiple times in different parts of the same person or animal, reducing the number of times the operator draws liquid and saving the consumption of needleless injector equipment. Since the liquid in the needleless injector can be injected in multiple times through the Meso booster device, the dosage of liquid drawn up once in the needleless injector is increased, and the stroke of the firing pin 2 can be changed each time, so that the dosage of each injection can be flexibly varied. The Meso booster device helps a single needleless injector to inject a large amount of liquid in a single draw in multiple times with adjustable dosage, which can significantly improve injection efficiency.

[0021] The mesotherapy booster device in this embodiment is a pneumatically based, high-dose, adjustable needle-free injection booster device used in the beauty and mesotherapy industry. Its impact needle 2 has a stroke of 0-40mm (the specific stroke can be set according to needs), and the injection dose is adjustable from 0.5-2ml (the specific injection dose can be set according to needs). The maximum single injection dose reaches 2ml, which is higher than the single injection dose of general mesotherapy booster devices. The single injection volume is more flexible, and a single aspiration can achieve multiple injections. That is, a single aspiration of 2ml of liquid can be used in multiple adjustments. If the dose is 0.5ml each time, it can save 3 needle-free injectors; or a single aspiration of 2ml of liquid can be adjusted multiple times according to the scale according to the required area. A disposable needle-free injector can achieve multiple injections, saving the number of needle-free injectors consumed.

[0022] The stroke adjustment module 3 further includes a sleeve 32 coaxially arranged and sleeved around the outer periphery of the gun body 1 and connected to the stroke adjustment sleeve 31, and a scale adjustment sleeve 33 connected to the sleeve 32 and / or the stroke adjustment sleeve 31. The outer peripheral surface of the scale adjustment sleeve 33 is provided with anti-slip texture and / or a tool locking structure to facilitate its rotation. The outer wall of the tail end of the gun body 1 is provided with axial markings to facilitate observation of the axial displacement generated by the stroke adjustment module 3 during the rotation of the scale adjustment sleeve 33. In this embodiment, the sleeve 32, the scale adjustment sleeve 33, and the stroke adjustment sleeve 31 are connected by the same screw, that is, the scale adjustment sleeve 33, the sleeve 32, and the stroke adjustment sleeve 31 are connected together by the same screw. When the scale adjustment sleeve 33 is rotated from different directions, the sleeve 32 and the stroke adjustment sleeve 31 also reciprocate.

[0023] To facilitate the installation of the stroke adjustment module 3, the tail rod section 23 in this embodiment is provided with a detachable end head 24, and the first limiting shoulder 241 is formed on the end head 24. The firing section 21, piston section 22, and tail rod section 23 of the firing pin 2 are preferably integrally formed.

[0024] Specifically, the gun body 1 of this embodiment includes a main body 11, a cylinder 12, a front cover 13, a rear cover 14, and a stroke fixing sleeve 15. The front cover 13, the cylinder 12, and the rear cover 14 are sequentially and sealingly connected to the main body 11, and the stroke fixing sleeve 15 is connected to the rear cover 14. The piston is in sealed contact with the cylinder 12, and a second vent hole 121 communicating with the first vent hole e is provided at one end of the cylinder 12 near the rear cover 14. The piston chamber b is provided with a second buffer pad 5 sleeved on the outer periphery of the tail rod section 23. The second buffer pad 5 abuts against the piston, and the tail rod section 23 extends from the cylinder 12 into the rear cover 14 and the stroke fixing sleeve 15. The rear cover 14 is provided with a first sealing element 141 that seals with the tail rod section 23, so that the firing pin 2, the rear cover 14, and the cylinder 12 form a relatively closed air chamber controlled by the control valve 4 for air intake or exhaust. The outer wall of the stroke fixing sleeve 15 is marked with graduations along the axial direction. In this embodiment, the outer peripheral wall of the stroke adjusting sleeve 31 is provided with external threads. The stroke adjusting sleeve 31 extends into the stroke fixing sleeve 15 and is threadedly connected to the stroke fixing sleeve 15. The firing section 21 extends from the cylinder 12 into the front cover 13. The front cover 13 is provided with a firing channel c adapted to the firing section 21.

[0025] The sleeve 32 is provided with a stop portion 321 at one end near the rear cover 14, and the travel fixing sleeve 15 is provided with a second limiting shoulder 151 at one end away from the rear cover 14. The end of the sleeve 32 away from the stop portion 321 is inserted into the end of the travel fixing sleeve 15 away from the second limiting shoulder 151. The second limiting shoulder 151 slides with the inner wall of the sleeve 32 to provide guidance for installation and screwing.

[0026] The receiving groove 311 is an annular groove or partial groove recessed axially inward from the end face of the stroke adjusting sleeve 31. The receiving groove 311 has a bottom wall. In some embodiments, the first limiting shoulder 241 is configured to abut against the bottom wall of the groove when moving towards the stroke adjusting sleeve 31. In other preferred embodiments, the first limiting shoulder 241 is provided with a first buffer pad 6 opposite to the bottom wall of the receiving groove 311, or the receiving groove 311 is provided with a first buffer pad 6 opposite to the first limiting shoulder 241. The first buffer pad 6 is fixedly connected to the stroke adjusting sleeve 31, and moves axially synchronously with the rotation of the stroke adjusting sleeve 31 relative to the gun body 1. The first buffer pad 6 is preferably disposed in the receiving groove 311 opened in the stroke adjusting sleeve 31. By rotating the scale adjusting sleeve 33, the first buffer pad 6 can also move back and forth to meet the limiting and buffering effects of different dosages. In this embodiment, the tail rod section 23 has a detachable end head 24 at its end. The end head 24 is disposed within a receiving groove 311 in the stroke adjustment sleeve 31, and the first limiting shoulder 241 is formed on the end head 24. By changing the axial position of the stroke adjustment sleeve 31, the contact position between the first limiting shoulder 241 and the stroke adjustment sleeve 31 can be adjusted, thereby adjusting the firing stroke of the firing pin 2 and realizing the adjustment of the injection dose. Axial movement is achieved by rotating the stroke adjustment sleeve 31, thereby steplessly adjusting the stroke and realizing stepless adjustment of the dose, achieving fine adjustment of the injection dose, and improving the accuracy of the injection dose.

[0027] The front cover 13 is used to connect with the needleless injector 7. The needleless injector 7 includes an injection cylinder 71 connected to the front cover 13 and a push rod 72 extending into the firing channel c. The markings on the stroke fixing sleeve 35 correspond to the markings on the injection cylinder 71. Based on the relationship between the sleeve 32 and the markings, the current stroke adjustment of the firing pin 2 or the liquid injection volume can be determined. The firing channel c has a second sealing element 131 near the piston chamber b for sealing with the firing section 21. The front cover 13 has a first vent 132 connecting the piston chamber b to the outside, and a second vent 133 connecting the firing channel c to the outside outside, outside the stroke of the firing section 21, to allow timely air intake and exhaust, preventing the formation of a vacuum or compressed air in the firing channel c during the movement of the firing pin 2, which could cause displacement errors in the push rod 72 and affect the accuracy of the injection.

[0028] When the control valve 4 controls the opening of the first vent e, the airflow in the air inlet chamber a enters the piston chamber b through the first vent e and the second vent 121. The airflow in the piston chamber b near the rear cover 14 acts on the surface of the piston section 22 opposite to the rear cover 14, and the firing pin 2 is fired. The firing section 21 abuts against the push rod 72 of the needleless injector 7 in the firing channel c, pushing the push rod 72 to squeeze the liquid in the syringe 71 until the first limiting shoulder 241 of the firing pin 2 abuts against the stroke adjustment sleeve 31 and is limited.

[0029] In this embodiment, a return spring 8 is also provided in the piston chamber b. The return spring 8 is sleeved outside the firing section 21, and the opposite ends of the return spring 8 abut against the front cover 13 and the piston section 22, respectively.

[0030] When control valve 4 closes the first vent e, preventing airflow from the intake chamber a from entering the piston chamber b through the first vent e and the second vent 121, the return spring 8 acts on the surface of the piston section 22 opposite to the front cover 13, causing the firing pin 2 to retract until the second buffer pad 5 abuts against the rear cover 14. During the retraction of the firing pin 2, the relative position of the push rod 72 and the syringe 71 remains unchanged. When the stroke adjustment sleeve 31 is turned to move it closer to the rear cover 14, i.e., the bottom wall of the receiving groove 311 moves forward a certain distance, the stroke of the firing pin 2 when fired again increases. This allows the push rod 72 to be pushed again, causing it to squeeze the remaining liquid in the syringe 71 until the firing pin 2 is limited by the stroke adjustment sleeve 31, thus achieving re-injection.

[0031] The gun body 1 is equipped with a trigger 16, which is configured to drive the control valve 4 to open or close the first vent e. The main body 11 of the gun body 1 is also provided with an exhaust passage g arranged parallel to the air intake chamber a, and the exhaust passage g is connected to the piston chamber b through a third vent f.

[0032] In some embodiments, the control valve 4 can be a conventional valve having a valve core directly connected to the trigger 16 and capable of being displaced by the trigger 16. When the valve core is in a predetermined position, it can block the first vent hole e; when displaced by the trigger 16, it can open the first vent hole e. Specifically, the control valve 4 in this embodiment includes a traveling valve element 41, a valve core element 42, a pin 43, and a valve cover 44. The traveling valve element 41 includes a sealing end 411, a sleeve cavity 412, a power ring 413, and a first air passage 414 communicating from the top surface of the traveling valve element 41 to the sleeve cavity 412. The sealing end 411 is used to block the first vent hole e. The power ring 413 is located outside the sleeve cavity 412 and abuts against the side wall of the valve cavity d. The valve core element 42 is fixedly disposed in the valve cavity d and includes a valve core column 421 and a valve core seat 422. The valve core 421 is located in the center of the valve core seat 422 and sleeved within the sleeve cavity 412. The valve core component 42 has a second air passage 423 connecting the top surface of the valve core 421 to the bottom surface of the valve core seat 422. The valve core seat 422 has a third air passage 424 connecting its upper surface and bottom surface. The valve cover 44 has a limiting hole, and the ejector pin 43 is located in the limiting hole. The bottom of the ejector pin 43 abuts against the trigger 16, and its top can be driven by the trigger 16 to press against the bottom surface of the valve core seat 422, thereby blocking the second air passage 423. The bottom of the movable valve component 41 has a first air chamber 415, and the top of the valve cover 44 has a second air chamber 441. The third air passage 424 connects the first air chamber 415 and the second air chamber 441.

[0033] It should be noted that when the trigger 16 is in the released state, the ejector pin 43 separates from the valve core 42, and the gas in the intake chamber a enters the second air passage 423 from the first air passage 414. After being ejected from the second air passage 423, it sequentially enters the second air chamber 441, the third air passage 424, and the first air chamber 415 to reach the bottom of the moving valve 41. Since the bottom area of ​​the moving valve 41 is larger than the area of ​​its sealing end 411, the air pressure will push the moving valve 41 to rise. The sealing end 411 will block the first vent hole e, and the connection between the intake chamber a and the piston chamber b will be blocked.

[0034] When the operator presses the trigger 16, the ejector pin 43 moves upward, blocking the outlet of the second air passage 423. Air in the second air chamber 441, the third air passage 424, and the first air chamber 415 flows out from the gap between the ejector pin 43 and the limiting hole 441, causing a relatively low pressure to form on the bottom surface of the moving valve 41. The moving valve 41 moves downward, and the sealing end 411 leaves the first vent hole e, connecting the air inlet chamber a and the piston chamber b. Gas enters the piston chamber b through the first vent hole e and simultaneously pushes the firing pin 2 to the left. The force of the firing pin 2 pushes the syringe to move.

[0035] With the control valve 4 described above, the ejector pin 43 is less affected by the gas pressure in the first gas chamber 415. Therefore, the operator only needs to apply a small amount of force to move the ejector pin 43, thereby controlling the supply of compressed gas. The operation is sensitive and quick, making it convenient for use in fields such as medical aesthetics that require precise operation.

[0036] Furthermore, this invention also discloses an embodiment of an injection device, which includes the aforementioned adjustable high-dose mesotherapy booster device and a needle-free injector 7. The needle-free injector 7 includes an injection cylinder 71 connected to the front cover 13 and a push rod 72 extending into the firing channel c. The gun body 1 is provided with markings corresponding to the graduations on the injection cylinder 71. Taking the example of using a disposable needle-free injector 7 to draw 2ml of liquid, loading it onto the booster device, and using it in four applications (0.5ml each time), the working process is as follows: 1. Rotate the scale adjustment sleeve 33 and align the left end of the sleeve 32 with the 0.5ml scale, then assemble the needleless syringe 7 filled with 2ml of liquid onto this booster device.

[0037] At this moment, the tip of the plunger 72 points to the 2ml mark, meaning that the liquid drawn into the needleless injector 7 is 2ml; the distance to B is 10mm; and the distance to A is 20mm.

[0038] 2. Pull the trigger 16 to the right. The firing pin 2 moves to the left under air pressure (the distance the firing pin 2 moves is 20). The firing pin 2 pushes the push rod 72 of the needleless injector 7 to the left, ejecting the liquid from the needleless injector 7. At the same time, the end 24 of the firing pin 2 is limited by the first buffer pad 6 and cannot move further to the left, ensuring that the dose ejected is 0.5ml (i.e., 2ml-1.5ml=0.5ml).

[0039] At this point, the distance that push rod 72 moves to the left is AB, which is 20-10=10. The tip of push rod 72 points to the 1.5ml mark, which means that the liquid has decreased by 0.5ml (2ml-1.5ml=0.5ml). 3. Release trigger 16, and the firing pin 2 will reset under the action of the spring; twist the scale adjustment sleeve 33 to move the sleeve 32 to the left by 10ml, that is, the scale points to 1ml.

[0040] At this point, the tip of the plunger 72 points to the 1.5ml mark, meaning there is 1.5ml remaining (0.5ml was dispensed the first time). Since the plunger 72 of the needleless injector 7 cannot be reset, the distance of B increases by 10ml, meaning the distance of B is now 20mm, and the distance of A is now 30mm.

[0041] 4. Pull the trigger 16 to the right. The firing pin 2 moves to the left under air pressure (the distance the firing pin 2 moves is 30). The firing pin 2 pushes the push rod 72 of the needleless injector 7 to the left, ejecting the liquid from the needleless injector 7. At the same time, the end 24 of the firing pin 2 is limited by the first buffer pad 6 and cannot move further to the left. At this time, the dose ejected is also 0.5ml (1.5ml-1ml=0.5ml), that is, 0.5ml is also ejected the second time.

[0042] At this point, the tip of push rod 72 points to the 1ml mark, meaning the liquid has decreased by 0.5ml (1.5ml - 1ml = 0.5ml); the distance push rod 72 has moved is AB, which is 30 - 20 = 10.

[0043] 5. Release trigger 16, and the firing pin 2 will reset under the action of the spring; at the same time, turn the scale adjustment sleeve 33 clockwise by hand, so that the sleeve 32 moves to the left by 10ml, that is, the scale points to 1.5ml.

[0044] At this point, the tip of the pusher 72 points to the 1ml mark, meaning there is 1ml left (1ml was ejected in the first two shots). Because the plunger 72 of the needleless injector 7 cannot be reset, the distance of B increases by 10ml, that is, the distance of B is now 30mm, and the distance of A is now 40mm.

[0045] 6. Pull the trigger 16 to the right. The firing pin 2 moves to the left under air pressure (the distance the firing pin 2 moves is 40). The firing pin 2 pushes the push rod 72 of the needleless injector 7 to the left, ejecting the liquid from the needleless injector 7. At the same time, the end 24 of the firing pin 2 is limited by the first buffer pad 6 and cannot move further to the left. At this time, the dose ejected is also 0.5ml (1ml-0.5ml=0.5ml), that is, 0.5ml is also ejected on the third time.

[0046] At this point, the tip of push rod 72 points to the 0.5ml mark, meaning the liquid has decreased by 0.5ml (1ml-0.5ml=0.5ml). The distance push rod 72 has moved is AB, which is 40-30=10.

[0047] 7. Release trigger 16, and the firing pin 2 will be reset under the action of the spring; at the same time, turn the scale adjustment sleeve 33 clockwise by hand, so that the sleeve 32 moves to the left by 10ml, that is, the scale points to 2ml.

[0048] At this point, the tip of the plunger 72 points to the 0.5ml mark, meaning there is 0.5ml left (a total of 1.5ml was dispensed in the first three injections). Since the plunger 72 of the needleless injector 7 cannot be reset, the distance of B increases by 10ml, meaning the distance of B is now 40mm, and the distance of A is now 50mm.

[0049] 8. Pull the trigger 16 to the right. The firing pin 2 moves to the left under air pressure (the distance the firing pin 2 moves is 50). The firing pin 2 pushes the push rod 72 of the needleless injector 7 to the left, ejecting the liquid from the needleless injector 7. At the same time, the end 24 of the firing pin 2 is limited by the first buffer pad 6 and cannot move further to the left. At this time, the dose ejected is also 0.5ml (0.5ml-0.5ml=0ml), that is, 0.5ml is also ejected on the fourth time.

[0050] At this point, the tip of push rod 72 points to the 0ml mark, meaning the liquid has decreased by 0.5ml (0.5ml-0.5ml=0ml). The liquid is now completely dispensed, and the distance push rod 72 has moved is AB, which is 50-40=10.

[0051] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An adjustable high-dose mesotherapy booster device, characterized in that, The gun includes a gun body, a firing pin, and a stroke adjustment module. The gun body has an air intake chamber, a piston chamber, a firing channel, and a valve chamber. The air intake chamber is configured to connect to an air intake pipe and communicate with the piston chamber through a first vent hole. The valve chamber is provided with a control valve that controls the opening and closing of the first vent hole. The firing pin is axially movable within the gun body and includes a firing section, a piston section, a tail rod section, and a first limiting shoulder arranged sequentially along the axial direction. The piston section is sealed to the piston chamber, the firing channel is adapted to the firing section, and the firing channel and / or the piston chamber near the firing channel is provided with a gas vent communicating with the outside. The stroke adjustment module includes a stroke adjustment sleeve sleeved on the outer periphery of the tail rod section and threadedly connected to the gun body. The stroke adjustment sleeve has an axially extending receiving groove, and the first limiting shoulder is received in the receiving groove. By rotating the stroke adjustment sleeve to change its axial position, the contact position between the first limiting shoulder and the stroke adjustment sleeve can be adjusted, thereby changing the firing stroke of the firing pin.

2. The adjustable high-dose mesotherapy booster device as described in claim 1, characterized in that, The receiving groove has a bottom wall, and the first limiting shoulder is configured to abut against the bottom wall when moving toward the stroke adjusting sleeve.

3. The adjustable high-dose mesotherapy booster device as described in claim 1, characterized in that, The receiving groove is provided with a first buffer pad opposite to the first limiting shoulder, and the first buffer pad moves axially synchronously with the rotation of the stroke adjusting sleeve relative to the gun body; or The first limiting shoulder is provided with a first buffer pad that is opposite to the bottom wall of the receiving groove.

4. The adjustable high-dose mesotherapy booster device as described in claim 1, characterized in that, The stroke adjustment module further includes a sleeve fitted around the outer periphery of the gun body and connected to the stroke adjustment sleeve, and a scale adjustment sleeve connected to the sleeve and / or the stroke adjustment sleeve. The outer periphery of the scale adjustment sleeve is provided with anti-slip texture and / or a structure for tool engagement. The outer wall of the gun body tail end is provided with marking scale along the axial direction.

5. The adjustable high-dose mesotherapy booster device as described in claim 4, characterized in that, The gun body includes a main body, a cylinder, a front cover, a rear cover, and a stroke fixing sleeve. The front cover, the cylinder, and the rear cover are sequentially connected to the main body. The stroke fixing sleeve is connected to the rear cover. The firing section extends from the cylinder into the front cover. The piston is in sealed contact with the cylinder. The tail rod section extends from the cylinder into the rear cover and the stroke fixing sleeve. The rear cover is provided with a first sealing element that seals with the tail rod section. The marking scale is provided on the outer wall surface of the stroke fixing sleeve. The stroke adjustment sleeve extends into the stroke fixing sleeve and is threadedly connected to the stroke fixing sleeve.

6. The adjustable high-dose mesotherapy booster device as described in claim 5, characterized in that, The sleeve has a stop at one end near the rear cover, and the travel fixing sleeve has a second limiting shoulder at one end away from the rear cover. The sleeve is inserted from the end away from the stop at one end of the travel fixing sleeve away from the second limiting shoulder, and the second limiting shoulder slides in cooperation with the inner wall of the sleeve.

7. The adjustable high-dose mesotherapy booster device as described in claim 5, characterized in that, The firing channel is located on the front cover. The end of the firing channel near the piston chamber is provided with a second sealing element for sealing cooperation with the firing section. The front cover is provided with a first air guide hole connecting the piston chamber to the outside. The front cover is also provided with a second air guide hole connecting the firing channel to the outside outside outside the stroke of the firing section.

8. The adjustable high-dose mesotherapy booster device as described in claim 1, characterized in that, The piston chamber is provided with a second buffer pad sleeved on the outer periphery of the tail rod section, and the second buffer pad abuts against the piston; The tail rod section has a detachable end head at its end, and the first limiting shoulder is formed on the end head.

9. The adjustable high-dose mesotherapy booster device as described in claim 5, characterized in that, It also includes a return spring sleeved outside the firing section, with the opposite ends of the return spring abutting against the front cover and the piston section, respectively.

10. An injection device, characterized in that, The device includes the adjustable high-dose mesotherapy booster device as described in any one of claims 1 to 9, and a needleless injector, the needleless injector including an injection cylinder connected to the front cover and a push rod extending into the firing channel, the gun body having markings corresponding to the scale lines on the injection cylinder.

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