Pneumatic needleless injection device

Abstract

The utility model discloses a pneumatic needleless injection device, and belongs to the field of medical equipment. A pneumatic needleless injection device comprises a cylinder body provided with a cavity, and a front end cover and a rear end cover are arranged at the two ends of the cylinder body respectively; the front end cover extends outwards to form a liquid suction channel; the first piston is arranged in the cavity in a sliding mode and located between the front end cover and the rear end cover. The air pressure storage mechanism is arranged in a cavity between the first piston and the rear end cover; the plunger is located in the liquid suction channel, and one end of the plunger is fixedly connected with the first piston; and the nozzle is arranged at an outlet of the liquid suction channel. The pneumatic needleless injection device has the beneficial effects of being long in service life and high in flexibility.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to a pneumatic needle-free injection device. Background Art

[0002] The needle-free syringe generates a driving force through a driving device, pushing a large piston (13) at high speed, so that the liquid stored in the container obtains a large kinetic energy in a short time, and then is ejected from the jet hole at high speed, pierces the skin and is dispersed at a specific position to achieve drug delivery.

[0003] The Chinese utility model patent with the authorization announcement number CN218793404U discloses a needle-free injection device, including a driving mechanism, a cam, a spring energy storage component, and a syringe component. The spring energy storage component includes a sliding rod, a lever arranged on the sliding rod, and a power spring sleeved on the sliding rod. The driving mechanism is used to drive the cam to rotate. The rotation of the cam drives the lever, which in turn drives the sliding rod to slide up and down. When the sliding rod moves upward, the power spring is compressed to store energy. When the cam continues to rotate until the lever loses support, the compressed energy of the power spring is instantly released, and the sliding rod quickly moves downward to drive the syringe component to inject liquid. The utility model realizes the compressed energy storage and instant release of the compressed energy of the power spring by driving the cam to rotate. The entire device structure is simple and practical. Compared with the prior art syringe device, it consumes less energy and can be designed to be more compact and easy to carry.

[0004] The above structure uses a spring-loaded needle-free syringe, which has a simple structure and low cost and has been widely used in the market. However, after long-term use, the stiffness coefficient of the spring will decrease, making it less flexible and unable to work continuously, resulting in a limited service life of the syringe and a limited injection dose. Utility Model Content

[0005] The purpose of the utility model is to provide a pneumatic needle-free injection device. The utility model can drive the first piston and the plunger by high-pressure driving to efficiently and quickly inject the liquid medicine in the device, so that the needle-free injection device has higher flexibility and faster response speed than the traditional spring-type needle-free syringe, and greatly improves the service life of the injection device.

[0006] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0007] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a pneumatic needle-free injection device, including:

[0008] The cylinder body has a chamber, and the two ends of the cylinder body are respectively provided with a front cover and a rear cover; the front cover extends outwardly with a liquid suction channel;

[0009] A first piston is slidably disposed in the chamber and is located between the front end cover and the rear end cover;

[0010] A gas pressure accumulator mechanism is disposed in a chamber between the first piston and the rear end cover;

[0011] A plunger, located in the liquid suction channel, one end of which is fixedly connected to the first piston;

[0012] A nozzle, disposed at the outlet of the liquid suction channel;

[0013] The cylinder body is provided with a first connection port and a second connection port; the first connection port is connected to the chamber between the first piston and the rear end cover; the second connection port is connected to the chamber between the first piston and the front end cover.

[0014] Furthermore, the pneumatic needle-free injection device further comprises:

[0015] A liquid storage tube, provided on the front end cover, having a liquid storage cavity for storing liquid medicine and connected to the liquid suction channel;

[0016] A one-way valve, disposed at the connection between the liquid storage tube and the liquid suction channel, for preventing the liquid medicine in the liquid suction channel from flowing into the liquid storage cavity;

[0017] A third piston is slidably disposed in the liquid storage chamber;

[0018] Wherein, a third connecting port is opened on the side wall of the liquid storage tube, and the third piston is located between the third connecting port and the one-way valve.

[0019] Furthermore, the pneumatic needle-free injection device further comprises:

[0020] A three-position four-way electromagnetic reversing valve is connected to the first connection port and the second connection port;

[0021] The two-position two-way electromagnetic reversing valve is connected to the second connecting port and the third connecting port.

[0022] Furthermore, the pneumatic needle-free injection device further comprises:

[0023] A lock buckle, provided on one end of the first piston close to the plunger, for connecting the first piston and the plunger;

[0024] There is a gap between the lock buckle and the first piston in the axial direction of the piston.

[0025] Furthermore, the pneumatic needle-free injection device further comprises:

[0026] A one-way sealing member is arranged at the nozzle and is used to prevent air from entering the liquid suction channel through the nozzle.

[0027] Furthermore, the pneumatic needle-free injection device further comprises:

[0028] The second piston is located in the chamber and is threadedly connected to the rear end cover for adjusting the sliding stroke of the first piston in the chamber.

[0029] Furthermore, the air pressure storage mechanism comprises:

[0030] A first magnet is disposed on one end of the second piston close to the first piston and located in the chamber;

[0031] The second magnet is disposed on one end of the first piston close to the second piston, is located in the chamber, and is attracted to the first magnet by opposite charges.

[0032] Furthermore, the first piston, the second piston and the plunger are all provided with sealing rings.

[0033] Compared with the prior art, the utility model has the following beneficial effects:

[0034] 1. By inflating air into the chamber between the first piston and the rear end cover, the air pressure in the chamber between the first piston and the rear end cover is slowly increased to the critical value of the air pressure storage mechanism, and then the first piston is quickly pushed to slide in the chamber, so that the injection device can perform needle-free injection. Compared with using a spring to drive the first piston to slide, it can effectively avoid the reduction of the rigidity of the spring after long-term use, resulting in a reduction in the service life of the injection device, thereby extending the service life of the injection device.

[0035] 2. The third piston moves downward to push the medicine in the liquid storage chamber into the liquid suction channel. Compared with directly sucking the medicine from the nozzle, it can prevent air from entering the liquid suction channel from the nozzle.

[0036] 3. The second bolt is threadedly connected to the rear end cover, so that the amount of injected liquid can be adjusted by rotating the second bolt, which facilitates the injection device to be freely adjusted according to different injection scenarios.

[0037] 4. Through the attraction between the opposite poles of the first magnet and the second magnet, the first magnet and the second magnet begin to store energy when the high-pressure chamber is inflated. When the air pressure in the high-pressure chamber is greater than the attraction between the first magnet and the second magnet, injection begins, and the speed of the jet is increased by storing energy through the magnets. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0039] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0040] In the attached picture:

[0041] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0042] Figure 2 It is a structural schematic diagram of a part of the embodiment, mainly showing the internal structure of the pneumatic needle-free injection device;

[0043] Figure 3 It is a structural schematic diagram of a part of the embodiment, mainly showing the second piston structure;

[0044] Figure 4 It is a structural schematic diagram of a part of the embodiment, mainly showing the first piston structure;

[0045] Figure 5 It is a structural schematic diagram of a part of the embodiment, mainly showing the plunger structure;

[0046] Figure 6 It is a structural schematic diagram of a part of the embodiment, mainly showing a one-way valve structure;

[0047] Figure 7 It is a diagram of the initial state of the pneumatic needle-free injection device;

[0048] Figure 8 It is a diagram of the injection state of a pneumatic needle-free injection device;

[0049] Fig. 9 It is a diagram of the liquid aspiration state of the pneumatic needle-free injection device.

[0050] Reference numerals:

[0051] 100. Pneumatic needle-free injection device;

[0052] 101, cylinder body; 101a, chamber; 101b, first opening; 101c, second opening; 101d, closed chamber; 101e, high pressure chamber; 101f, first connection port; 101g, second connection port;

[0053] 102, front end cover; 102a, liquid suction channel;

[0054] 103, rear end cover;

[0055] 104, first piston;

[0056] 105, second piston;

[0057] 106. Plunger;

[0058] 107. Nozzle;

[0059] 108. The first magnet;

[0060] 109, second magnet;

[0061] 110, liquid storage tube; 110a, liquid storage chamber; 110b, third connection port;

[0062] 111. One-way valve;

[0063] 112, third piston;

[0064] 113. Three-position four-way solenoid reversing valve;

[0065] 114. Two-position two-way solenoid reversing valve;

[0066] 115. Lock;

[0067] 116. One-way seal. DETAILED DESCRIPTION

[0068] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0069] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0070] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0071] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0072] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0073] Reference Figure 1-9 A pneumatic needle-free injection device 100 includes: a cylinder 101, a front cover 102, a rear cover 103, a first piston 104, a second piston 105, a plunger 106, a nozzle 107, and a gas pressure storage mechanism 117; the cylinder 101 has a chamber 101a, and a first opening 101b and a second opening 101c communicating with the chamber 101a are respectively opened at both ends of the cylinder 101; the front cover 102 is fixed on the cylinder 101, and is located at the first opening 101c. 1b, used for blocking the first opening 101b, the front end cover 102 extends in the direction away from the cylinder body 101 to form a suction channel 102a that penetrates the front end cover 102; the rear end cover 103 is fixed on the cylinder body 101, located at the second opening 101c, used for blocking the second opening 101c, and a threaded hole is opened on the rear end cover 103; the first piston 104 is slidably arranged in the chamber 101a, and a sealing ring is provided on the contact surface between the first piston 104 and the inner wall of the chamber 101a.

[0074] The second piston 105 is threadedly connected to the rear end cover 103 and is threadedly connected to the threaded hole. The second piston 105 is at least partially located in the chamber 101a, and a sealing ring is provided on the contact surface between the second piston 105 and the inner wall of the chamber 101a; the plunger 106 is slidably arranged in the suction channel 102a and fixed on the end of the first piston 104 away from the first piston 104, and a sealing ring is provided on the contact surface between the plunger 106 and the suction channel 102a; the nozzle 107 is fixed on the front end cover 102, and is located at the end of the suction channel 102a away from the first piston 104. The nozzle 107 adopts a conical straight injection nozzle 107, and the aperture of the nozzle 107 is 0.5mm, 0.3mm, and 0.1mm. In other embodiments, corresponding sizes can also be set according to requirements.

[0075] The space between the first piston 104 and the front end cover 102 is a closed chamber 101d, and the space between the second piston 105 and the first piston 104 is a high-pressure chamber 101e.

[0076] By threading the second piston 105 on the rear end cover 103, the second piston 105 can be rotated to adjust the size of the chamber 101a between the second piston 105 and the front end cover 102, thereby adjusting the size of the liquid suction chamber 101a formed between the plunger 106 and the nozzle 107 to change the injection volume of the injection device.

[0077] The pneumatic pressure storage mechanism 117 is composed of a first magnet 108 and a second magnet 109. The first magnet 108 is fixed on the second piston 105 and is located at one end of the second piston 105 close to the first piston 104, and the first magnet 108 is located in the chamber 101a; the second magnet 109 is fixed on one end of the first piston 104 close to the second piston 105 and is located in the chamber 101a. The second magnet 109 and the first magnet 108 are attracted to each other by opposite charges, and both the first magnet 108 and the second magnet 109 are strong magnets; a first connecting port 101f and a second connecting port 101g are opened on the cylinder body 101, the first connecting port 101f is located between the first piston 104 and the second piston 105, and the second connecting port 101g is located between the first piston 104 and the second piston 105, and the second connecting port 101g is located between the first piston 104 and the front end cover 102.

[0078] Due to the opposite attraction between the first magnet 108 and the second magnet 109, when the high-pressure chamber 101e is filled with gas, the first magnet 108 and the second magnet 109 will begin to store energy. Injection will only begin when the pressure in the high-pressure chamber 101e is large enough to separate the two magnets. The magnet energy storage increases the speed of the jet.

[0079] A liquid storage tube 110 is fixed at the extension of the front end cover 102, and the liquid storage tube 110 has a liquid storage cavity 110a, which is connected to the liquid suction channel 102a. A one-way valve 111 is provided between the liquid storage cavity 110a and the liquid suction channel 102a. The one-way valve 111 is a one-way cone valve, which is used to block the medicinal liquid in the liquid suction channel 102a from entering the liquid storage cavity 110a, and only allows the medicinal liquid to enter the liquid suction channel 102a from the liquid storage cavity 110a, thereby effectively avoiding the situation of the medicinal liquid flowing back during the injection process and affecting the injection effect.

[0080] A third piston 112 is slidably disposed in the liquid storage chamber 110 a . A third connecting port 110 b is formed on the side wall of the liquid storage tube 110 . The third piston 112 is located between the third connecting port 110 b and the one-way valve 111 .

[0081] The pneumatic needle-free injection device 100 is externally connected to a high-pressure air filling and suction device (not shown in the figure), which is connected to the high-pressure chamber 101e through the first connection port 101f and the second connection port 101g, and is connected to the liquid storage chamber 110a through the third connection port 110b.

[0082] The air pressure in the closed chamber 101d and the high-pressure chamber 101e is adjusted by the high-pressure air filling and suction device, thereby controlling the reciprocating sliding of the first piston 104 in the chamber 101a, driving the plunger 106 to perform a reciprocating stroke motion in the liquid suction channel 102a.

[0083] Compared with the method of driving the first piston 104 to move at high speed by a spring, the method of driving the first piston 104 to move at high speed by high air pressure can effectively avoid the phenomenon that the stiffness coefficient of the spring will decrease after long-term use, thereby reducing the service life of the injection device, thereby extending the service life of the injection device, and can quickly perform continuous injections by adjusting the air pressure at two points in the high-pressure chamber 101e and the closed chamber 101d.

[0084] A three-position four-way electromagnetic reversing valve 113 is provided between the high-pressure air charging and suction device and the first connecting port 101f and the second connecting port 101g; a two-position two-way electromagnetic reversing valve 114 is provided between the high-pressure air charging and suction device and the third connecting port 110b.

[0085] When the needle-free injection device is in the initial state, Figure 7 , the three-position four-way solenoid reversing valve 113 is in the middle position, and the two-position two-way solenoid reversing valve 114 is in the right position. At this time, the first piston 104 is in a locked state; when the needle-free injection device is in the injection state, Figure 8 , the three-position four-way solenoid reversing valve 113 is in the left position, and the two-position two-way reversing valve is in the right position. At this time, the first piston 104 drives the lock 115 and the plunger 106 to move at high speed to complete the injection; when the needle-free injection device is in the liquid aspiration state, as shown in FIG. Fig. 9 , the three-position four-way electromagnetic reversing valve 113 is in the right position, and the two-position two-way reversing valve is in the left position. At this time, the first piston 104 drives the lock 115 and the plunger 106 to move toward the rear end cover 103, and a vacuum space is formed in the liquid suction channel 102a, so that the medicine flows into the liquid suction channel 102a. At the same time, the high-pressure gas enters the liquid storage chamber 110a through the two-position two-way electromagnetic reversing valve 114, pushing the third piston 112 of the liquid storage chamber 110a to press the medicine into the liquid suction channel 102a, which not only ensures that the medicine enters the liquid suction channel 102a in one direction and completely, but also achieves the purpose of maintaining the pressure balance of the entire system.

[0086] A lock buckle 115 is provided between the first piston 104 and the plunger 106, and the lock hole is used to fix the first piston 104 and the plunger 106. There is a gap in the axial direction between the first piston 104 and the lock hole, so that a distance at one end is left between the lock buckle 115 and the first piston 104 as a stroke gap of the first piston 104. When the high-pressure gas drives the first piston 104 to move in the direction of the front end cover 102 through the high-pressure chamber 101e, the first piston 104 contacts the lock buckle 115 and the plunger 106 after a high stroke at one end, and then moves together along the axial direction of the first piston 104 toward the nozzle 107 at a high speed, which can reduce the time required for the liquid medicine to reach the peak velocity, thereby improving the ability of the jet to penetrate the skin soft tissue.

[0087] A one-way seal 116 is fixed in the liquid suction channel 102 a . The one-way seal 116 is located at the nozzle 107 and is used to prevent air from entering the liquid suction channel 102 a through the nozzle 107 .

[0088] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. A pneumatic needle-free injection device, characterized in that: include: The cylinder body (101) has a chamber (101a), and the two ends of the cylinder body (101) are respectively provided with a front cover (102) and a rear cover (103); the front cover (102) extends outwardly to form a liquid suction channel (102a); A first piston (104) is slidably disposed in the chamber (101a) and is located between the front end cover (102) and the rear end cover (103); A gas pressure storage mechanism (117) is disposed in the chamber (101a) between the first piston (104) and the rear end cover (103); A plunger (106), located in the liquid suction channel (102a), one end of which is fixedly connected to the first piston (104); A nozzle (107) is disposed at the outlet of the liquid suction channel (102a); A liquid storage tube (110), arranged on the front end cover (102), having a liquid storage cavity (110a) for storing liquid medicine and communicating with the liquid suction channel (102a); a one-way valve (111), disposed at the connection point between the liquid storage tube (110) and the liquid suction channel (102a), and used to prevent the liquid medicine in the liquid suction channel (102a) from flowing into the liquid storage cavity (110a); A third piston (112) is slidably disposed in the liquid storage chamber (110a); The cylinder body (101) is provided with a first connection port (101f) and a second connection port (101g); the first connection port (101f) is connected to the chamber (101a) between the first piston (104) and the rear end cover (103); the second connection port (101g) is connected to the chamber (101a) between the first piston (104) and the front end cover (102); a third connection port (110b) is provided on the side wall of the liquid storage tube (110), and the third piston (112) is located between the third connection port (110b) and the one-way valve (111).

2. The pneumatic needle-free injection device according to claim 1, characterized in that: The pneumatic needle-free injection device further comprises: A three-position four-way electromagnetic reversing valve (113) connected to the first connecting port (101f) and the second connecting port (101g); A two-position two-way electromagnetic reversing valve (114) is connected to the second connecting port (101g) and the third connecting port (110b).

3. The pneumatic needle-free injection device according to claim 1, characterized in that: The pneumatic needle-free injection device further comprises: A lock buckle (115), provided on one end of the first piston (104) close to the plunger (106), and used for connecting the first piston (104) and the plunger (106); There is a gap between the lock buckle (115) and the first piston (104) in the axial direction of the piston.

4. The pneumatic needle-free injection device according to claim 1, characterized in that: The pneumatic needle-free injection device further comprises: A one-way seal (116) is provided at the nozzle (107) and is used to prevent air from entering the liquid suction channel (102a) through the nozzle (107).

5. The pneumatic needle-free injection device according to claim 1, characterized in that: The pneumatic needle-free injection device further comprises: The second piston (105) is located in the chamber (101a) and is threadedly connected to the rear end cover (103) for adjusting the sliding stroke of the first piston (104) in the chamber (101a).

6. The pneumatic needle-free injection device according to claim 5, characterized in that: The air pressure storage mechanism (117) comprises: A first magnet (108) is disposed on one end of the second piston (105) close to the first piston (104) and is located in the chamber (101a); The second magnet (109) is arranged on one end of the first piston (104) close to the second piston (105), is located in the chamber (101a), and attracts the first magnet (108) by opposite polarities.

7. The pneumatic needle-free injection device according to claim 6, characterized in that: The first piston (104), the second piston (105) and the plunger (106) are all provided with sealing rings.

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