CN114984379B - High-pressure driven needleless injection device - Google Patents

Abstract

The invention discloses a high-pressure driving needleless injection device for delivering external liquid medicine to an individual intradermal space, which comprises a cylinder body, an injection mechanism and a high-pressure driving assembly arranged outside the cylinder body. One end of the cylinder body is connected with a first end cover, and the other end of the cylinder body is connected with a second end cover; the injection mechanism part is arranged in a space surrounded by the cylinder body, the first end cover and the second end cover and comprises a piston and a firing pin, the firing pin is nested in the piston, and the piston is nested in the cylinder body; the high-pressure driving assembly is communicated with the interior of the cylinder body and provides driving force for the injection mechanism. The piston and the firing pin are driven by high pressure so as to efficiently and rapidly drive the liquid medicine in the device from inside to outside, so that the needleless injection device has higher flexibility and faster response speed compared with the traditional spring needleless injector, and the service life of the injection device is greatly prolonged.

Description

High-pressure driven needleless injection device

Technical Field

The invention relates to the field of medical drug injection, in particular to a high-pressure driving needleless injection device.

Background

Traditional syringe needle carries out the medicine injection outside the body through the syringe needle, and this kind of mode is through stainless steel syringe needle with the medicine injection to internal, and the syringe needle causes the damage to human tissue easily, and a large amount of disposable syringe needles abandon can cause great pollution to the environment after using simultaneously.

The needleless injector generates driving force through the driving device, and pushes the piston rod at high speed, so that the liquid stored in the container obtains larger kinetic energy in a short time, and then is ejected out from the jet orifice at high speed, and is dispersed and distributed at a specific position after penetrating the skin, thereby realizing drug delivery.

The spring type needleless injector in the prior art has the advantages of simple structure and low cost, and is widely applied to the market, but the stiffness coefficient of the spring can be reduced after long-time use, so that the flexibility is poor, continuous operation can not be realized, and the service life of the injector is limited. Accordingly, there is a need to provide a high pressure driven needleless injection device that solves the problems of the prior art.

Disclosure of Invention

The embodiment of the application solves the technical problems of poor flexibility and short service life of the drug injector in the prior art by providing the high-pressure driving needleless injection device.

In order to solve the technical problems, the embodiment of the application provides a high-pressure driving needleless injection device for delivering external liquid medicine to an individual intradermal space, which comprises a cylinder body, an injection mechanism and a high-pressure driving assembly arranged outside the cylinder body, wherein one end of the cylinder body is connected with a first end cover, and the other end of the cylinder body is connected with a second end cover; the injection mechanism part is arranged in a space surrounded by the cylinder body, the first end cover and the second end cover and comprises a piston and a firing pin, the firing pin is nested in the piston, and the piston is nested in the cylinder body; the high pressure drive assembly communicates with the interior of the cylinder and provides the driving force for the injection mechanism.

By adopting the technical scheme provided in the embodiment of the application, the method has at least the following technical effects:

because the injection mechanism is arranged in the space surrounded by the first end cover, the second end cover and the cylinder body and is communicated to the inside of the cylinder body through the high-pressure driving assembly, the piston and the firing pin are driven in a high-pressure driving mode, so that the liquid medicine in the device is injected efficiently and quickly, the needleless injection device has higher flexibility and faster response speed compared with the traditional spring needleless injector, and the service life of the injection device is greatly prolonged.

Further, a first sealing ring and a third sealing ring are arranged between the cylinder body and the piston, a fourth sealing ring is arranged between the first end cover and the cylinder body, a first cavity is formed between the piston and the first end cover through the third sealing ring and the fourth sealing ring, and a second cavity is formed between the cylinder body and the piston through the first sealing ring and the third sealing ring.

The beneficial effects of adopting the further scheme are as follows: through multichannel sealing washer, separate into a plurality of sealed cavitys between cylinder body, piston and the firing pin, provide stroke space for high-pressure drive arrangement to realize stronger high-pressure drive effect.

Further, the second end cover comprises a cover body and a through column which is arranged in the center of the cover body in a penetrating way, a through hole is arranged in the center of the through column, and the firing pin can be inserted into the through hole to perform reciprocating motion; a second sealing ring is arranged between the firing pin and the through column, and when one end of the firing pin moves in the through hole, a liquid suction cavity is formed between the other end of the firing pin and the through column and used for absorbing and accommodating external liquid medicine; and a third cavity is formed between the piston, the firing pin and the through column, and a pressure relief hole is formed in the piston and is used for communicating the third cavity with the second cavity.

The beneficial effects of adopting the further scheme are as follows: through arranging a through column with a through hole on the second end cover, when the firing pin reciprocates in the through hole, a liquid suction cavity with a negative pressure adsorption effect is formed in the through hole, external liquid medicine can be adsorbed into the liquid suction cavity, and the piston and the firing pin generate axial movement under high-pressure impact to drive the liquid medicine to be ejected outwards; and the pressure relief hole is arranged in the structure of the invention to communicate the third cavity with the second cavity, so as to ensure that high-pressure gas in the third cavity can be discharged into the second cavity, keep internal and external pressure balance, prolong the service life of the device and prevent the device from being damaged due to overlarge pressure in the third cavity.

Further, a seal plug is provided coaxially with the striker at one end of the piston, and a stroke gap is formed between the seal plug and the striker.

The beneficial effects of adopting the further scheme are as follows: by means of the arrangement of the sealing plug, on one hand, the first cavity is isolated from the third cavity, and pressure relief is avoided; on the other hand, a stroke gap is formed between the sealing plug and the firing pin, when the high-pressure gas drives the piston to move rightwards through the first cavity, the sealing plug contacts with the firing pin after a section of high-speed stroke and then moves rightwards at a high speed along the axis, so that the time required for the liquid medicine to reach the peak speed can be reduced, and the capability of penetrating the skin soft tissue by jet flow is improved.

Further, at least one guide ring is provided between the piston and the cylinder, and at least one guide ring is provided between the striker and the through post.

The beneficial effects of adopting the further scheme are as follows: guide rings are arranged between the piston and the cylinder body and between the firing pin and the through column, so that the damage caused by mutual contact friction between the piston and the cylinder body and between the firing pin and the through column can be avoided on the first aspect, and the second aspect can play a role in correcting the coaxiality between the cylinder body and the piston and between the firing pin and the second end cover, so that the eccentricity among the cylinder body, the piston, the firing pin and the through column is avoided, and the sealing and injection effects of the device are influenced.

Further, a first connecting channel and a second connecting channel are arranged on the cylinder body, one end of the high-pressure driving assembly is communicated with the first cavity through the first connecting channel, the other end of the high-pressure driving assembly is communicated with the second cavity through the second connecting channel, and the piston is controlled to drive the firing pin to perform reciprocating stroke motion in the through column by controlling the pressure in the first cavity and the pressure in the second cavity.

The beneficial effects of adopting the further scheme are as follows: the cylinder body is provided with the connecting channels, so that high-pressure gas in an external high-pressure driving gas source can enter different cavities of the device, and the piston and the firing pin are controlled to perform quick stroke movement through the high-pressure gas.

Further, the injection mechanism further comprises a nozzle detachably connected to the outside of the second end cap.

The beneficial effects of adopting the further scheme are as follows: the injection mechanism is provided with the nozzle, and the nozzle can be conveniently and detachably connected with the second end cover so as to change the jet impact speed and improve the injection efficiency.

Further, the nozzle is a flat-top type injection nozzle or a conical straight type injection nozzle.

The beneficial effects of adopting the further scheme are as follows: the flat-top injection nozzle and the conical straight injection nozzle are convenient to process and realize mass production, and the jet penetration capability is high, the utilization rate is high, and the controllability is high.

Further, the injection mechanism further comprises a liquid storage container, a communication hole is formed in the second end cover, the liquid storage container conveys external liquid medicine into the communication hole, the communication hole is connected to the liquid suction cavity, and a one-way valve is arranged between the liquid storage container and the liquid suction cavity.

The beneficial effects of adopting the further scheme are as follows: by arranging the liquid storage container, the injection mechanism is provided with a space for storing the liquid medicine, and the liquid medicine flows in through the communication hole on the second end coverLiquid suction cavityAnd the check valve is arranged in the communication hole to limit the flow direction of the liquid medicine, namely, the liquid medicine flows into the liquid suction cavity from the liquid storage container, so that the condition that the liquid medicine flows backwards is avoided, and the injection effect is influenced.

Further, the high-pressure driving assembly comprises a high-pressure air source and a reversing valve, and a throttle valve is arranged between the high-pressure air source and the reversing valve.

The beneficial effects of adopting the further scheme are as follows: the high-pressure gas is used as a power source of the driving assembly, the cost is low, the environment is protected, the reliability is ensured, the throttle valve is arranged between the high-pressure gas source and the reversing valve, the pressure is convenient to adjust, the throttle and the pressure are reduced, and the reliability of the injection loading process is further enhanced.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

FIG. 1 is a schematic illustration of a high pressure driven needleless injection device provided in one embodiment of the present invention;

FIG. 2 is a schematic view showing the structure of the high-pressure driven needleless injection device in an initial state provided by section A-A in the embodiment of FIG. 1

FIG. 3 is a schematic view of the embodiment of FIG. 1 showing the critical injection state of the high pressure driven needleless injection device provided by section A-A;

FIG. 4 is a schematic illustration of the injection completion of the high pressure driven needleless injection device provided in section A-A of the embodiment of FIG. 1;

FIG. 5 is a schematic cross-sectional view of a conical straight injection nozzle according to one embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a flat top injection nozzle according to another embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view showing an initial state of a high-pressure driven needleless injection device according to another embodiment of the present invention;

FIG. 8 is a schematic cross-sectional view showing an injection completion state of a high-pressure driven needleless injection device according to another embodiment of the present invention;

fig. 9 is a schematic perspective view of a second end cap according to embodiment 1 of the present invention.

Fig. 10 is a schematic perspective view of a second end cap according to embodiment 2 of the present invention.

In the figure:

1. a first end cap; 2. a first connection channel; 3. a first guide ring; 4. a pressure relief hole; 5. a reversing valve; 6. a high pressure air source; 7. a throttle valve; 8. a cylinder; 9. a piston; 10. a second connection channel; 11. a first seal ring; 12. a second guide ring; 13. a striker; 14. a second end cap; 141. a cover body; 1411. a communication hole; 142. a column is communicated; 1421. a through hole; 1422. a first through column; 1423. a second through-hole column; 15. a nozzle; 151. a frustum; 152. perforating; 153. a hollow cone; 154. a connection hole; 155. bolt holes; 156. a connecting column; 157. a liquid channel; 16. a liquid suction cavity; 17. a one-way valve; 18. a liquid storage container; 19. a third guide ring; 20. a fourth guide ring; 21. a second seal ring; 22. a third cavity; 23. a second cavity; 24. a third seal ring; 25. sealing and plugging; 26. a first cavity; 27. a fourth seal ring; 28. a fixing member; 29. and a fifth sealing ring.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that references to orientation descriptions, such as directions of up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, the meaning of a number is more than one, the following, the inner etc. are understood to include the present number. If first, second, etc. are described for the purpose of distinguishing between technical features only and not necessarily for the purpose of indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical solution.

In the description of the present application, a description with reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The embodiment of the application solves the problems of low flexibility, slow response speed and poor service life of the traditional spring type needleless injector in the prior art by providing the high-pressure driving needleless injection device. In order to solve the above technical problems and thereby provide the present design solution, the following detailed description of the technical solution of the present application is provided through the accompanying drawings and the specific embodiments, and it should be understood that the specific features of the embodiments and the embodiments of the present application are detailed descriptions of the technical solution of the present application, and not limit the technical solution of the present application, and the technical features of the embodiments and the embodiments of the present application may be combined with each other under the condition of no conflict.

Referring to fig. 1 and 2, fig. 1 is a schematic perspective view of a high-pressure driven needleless injection device according to an embodiment of the present invention, and fig. 2 is a schematic view of section A-A of fig. 1, as shown in the following:

a high-pressure driving needleless injection device for delivering external liquid medicine to an individual intradermal space, which comprises a cylinder body 8, an injection mechanism and a high-pressure driving component arranged outside the cylinder body 8, wherein the left end of the cylinder body 8 is connected with a first end cover 1, and the right end is connected with a second end cover 14; the injection mechanism part is arranged in a space surrounded by the cylinder body 8, the first end cover 1 and the second end cover 14, and comprises a piston 9 and a firing pin 13, wherein the firing pin 13 is nested in the piston 9, and the piston 9 is nested in the cylinder body 8; the high pressure drive assembly communicates with the interior of the cylinder 8 and provides the driving force for the injection mechanism. Because the injection mechanism is arranged in the space surrounded by the first end cover 1, the second end cover 14 and the cylinder body 8, and the piston 9 and the firing pin 13 are driven by high pressure, so that the injection of the liquid medicine in the device from inside to outside can be realized efficiently and rapidly, the needleless injection device has higher flexibility and faster response speed compared with the traditional spring needleless injector, and the service life of the injection device is greatly prolonged.

The high-pressure driving needleless injection device of the embodiment of the invention completes the subcutaneous injection of the liquid medicine based on the high-pressure jet penetration principle, namely, the driving system in the needleless injection device drives the firing pin, thereby pushing the liquid medicine in the needleless injection device to form a superfine liquid medicine column through micropores, leading the liquid medicine to instantaneously penetrate the epidermis of an individual to reach the subcutaneous part, and leading the liquid medicine to be dispersed at a certain depth of the subcutaneous part and then be absorbed.

Fig. 2 is a schematic structural diagram of an injection initiation state of one embodiment of the high-pressure driving needleless injection device of the present invention, in some embodiments, the first end cap 1 is connected to the cylinder 8 through a fixing member 28, for facilitating the fixing connection, the fixing member is a bolt, a counter bore is provided on the first end cap 1, one end of the cylinder 8 connects the first end cap 1 to the cylinder 8 through a socket head cap bolt, and a fourth sealing ring 27 is provided between the cylinder 8 and the first end cap 1, so that a sealing form is formed between the cylinder 8 and the first end cap 1. As shown in the figure, in the initial state of high-pressure driving to be injected, the second end cover 14 is connected and fixed on the cylinder 8 in the same way at the other end of the cylinder 8 to form a sealing structure, while the injection mechanism part is arranged in the space enclosed by the cylinder 8, the first end cover 1 and the second end cover 14, so that space conditions are provided for driving the injection mechanism by the external high-pressure driving component, the injection mechanism comprises a piston 9 and a firing pin 13, the piston 9 is nested in the cylinder 8 and can reciprocate under the driving of pressure, and the firing pin 13 is nested in the piston 9 and can be driven by the piston 9 to perform stroke movement.

In some embodiments, the high-pressure driving assembly may be an externally provided hydraulic power source or an air pressure power source, and may be set according to practical situations as long as the power for performing the stroke motion can be provided for the piston 9; preferably, the high-pressure driving assembly in this embodiment includes a high-pressure air source 6 and a reversing valve 5, specifically, the high-pressure air source 6 is a portable high-pressure air cylinder, nitrogen is filled in the cylinder, a throttle valve 7 is disposed between the high-pressure air source 6 and the reversing valve 5, the high-pressure air source 6 controls the reciprocating stroke motion of a piston 9 through the throttle valve 7 and the reversing valve 5, the throttle valve 7 is used for controlling the flow of the air source, in this embodiment, the reversing valve 5 adopts a two-position four-way reversing valve, and the reversing valve 5 is used for changing the direction of air inlet and air outlet of the air source so as to change the direction of the piston motion. Therefore, the high-pressure nitrogen is used as a power source of the high-pressure driving assembly, the cost is low, the environment is protected, the reliability is ensured, and the throttle valve 7 is arranged between the high-pressure air source 6 and the reversing valve 5, so that the pressure can be conveniently regulated, the throttle and the pressure can be conveniently reduced, and the reliability of the injection loading process is enhanced.

In some embodiments, a first sealing ring 11 and a third sealing ring 24 are arranged between the cylinder 8 and the piston 9, specifically, the third sealing ring 24 is arranged at a position close to the first end cover 1, the first sealing ring 11 is arranged at the other end position of the piston 9 away from the first end cover 1, that is, the piston 9 and the cylinder 8 are composed of cylinders with non-equal diameters, and when the piston 9 moves in the cylinder 8, different closed spaces are generated between the piston 9 and the cylinder 8; a fourth sealing ring 27 is arranged between the first end cover 1 and the cylinder body 8 to prevent energy loss caused by pressure leakage in the cylinder body 8, a first cavity 26 is formed between the piston 9 and the first end cover 1 through the third sealing ring 24 and the fourth sealing ring 27 in the cylinder body 8, a second cavity 23 is formed between the cylinder body 8 and the piston 9 through the first sealing ring 11 and the third sealing ring 24, and the first cavity 26 and the second cavity 23 can provide space for inputting driving pressure for a high-pressure driving assembly.

Specifically, the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring all adopt O-shaped sealing rings, so that the installation is convenient.

In some embodiments, the second end cover 14 includes a cover body 141 and a through post 142 penetrating through the center of the cover body 141, a through hole 1421 is provided in the center of the through post 142, as shown in fig. 9, which is a schematic structural diagram of the second end cover 14 in this embodiment, a counter bore is provided on the second end cover 14, and is used for being fixedly connected to the cylinder 8 by a bolt, a communication hole 1411 is provided on a side surface of the second end cover 14, through posts 142 are integrally provided on two sides of the second end cover 14 and coaxial with the second end cover 14, a longer first through post 1422 is provided on one side of the second end cover 14, a shorter second through post 1423 is provided on the other side, and an external thread is provided on the second through post 1423.

It will be appreciated that the second end cap 14 is connected to the cylinder 8 by a socket head cap screw, at this time, the first through-cylinder 1422 at the longer end of the through-cylinder 142 extends into the cylinder 8, the second through-cylinder 1423 at the other end is exposed outside the cylinder 8, and the striker 13 can reciprocate in the through-hole 1421; a second sealing ring 21 is arranged between the firing pin 13 and the through column 142, when the firing pin 13 moves in the through hole (1421), a liquid suction cavity 16 is formed between the right end of the firing pin 13 and the through column 142, the liquid suction cavity 16 is used for absorbing and storing external liquid medicine, and the volume of the liquid suction cavity 16 directly influences the injection flow and the injection duration of the nozzle 15; a third cavity 22 is formed among the piston 9, the firing pin 13 and the through column 142, the third cavity 22 provides space for the piston 9 to drive the firing pin 13 to move, the piston 9 is provided with a pressure relief hole 4, the pressure relief hole 4 communicates the third cavity 22 with the second cavity 23, the piston 9 and the firing pin 13 provide injection force under high-pressure impact, the pressure relief hole 4 communicates the third cavity 22 with the second cavity 23 so as to ensure that high-pressure gas in the third cavity 22 is timely discharged in the process that the firing pin 13 moves forward after being impacted by the piston 9, and high-pressure gas generated in the third cavity 22 can be discharged into the second cavity 23 so as to keep internal and external pressure balance, prolong the service life of the device and prevent the damage to the device due to overlarge internal pressure of the third cavity 22.

In some embodiments, a sealing plug 25 is provided coaxially with the striker 13 at one end of the plunger 9, a stroke gap is formed between the sealing plug 25 and the striker 13, and one end of the striker 13 is restricted in the stroke gap to ensure that the striker 13 can be driven by the plunger 9 for impact injection. Specifically, the sealing plug 25 is an inner hexagonal plug with a sealing ring, the depth of the sealing plug 25 screwed into the stroke gap can be adjusted, so that the initial kinetic energy of the piston 9 when striking the firing pin 13 is changed, and the first cavity 26 is isolated from the third cavity 22 by the arrangement of the sealing plug 25, so that pressure relief is avoided; on the other hand, a stroke gap is formed between the sealing plug 25 and the firing pin 13, when high-pressure gas drives the piston 9 to move rightwards through the first cavity 26, the sealing plug 25 contacts with the firing pin 13 after a section of high-speed stroke and then moves rightwards at a high speed along the axis together, so that the time required for the liquid medicine to reach the peak speed can be reduced, and the capability of penetrating the skin soft tissues by jet flow is improved.

In some embodiments, at least one guide ring is provided between the piston 9 and the cylinder 8, and at least one guide ring is provided between the striker 13 and the post 142. Specifically, a first guide ring 3 is arranged between the piston 9 and the cylinder 8 and near one end of the third seal ring 24, a second guide ring 12 is arranged between the piston 9 and the cylinder 8 and near one end of the first seal ring 11, the first guide ring 3 and the second guide ring 12 play a role in supporting and guiding the piston 9, and the piston 9 can be prevented from directly contacting and rubbing with the cylinder 8 in the moving process, so that the service life of the device is prolonged; a third guide ring 19 and a fourth guide ring 20 are arranged between the firing pin 13 and the through post 142 and near the second sealing ring 21, and the third guide ring 19 and the fourth guide ring 20 play a role in supporting and guiding the through post 142, so that the firing pin 13 can be prevented from directly contacting and rubbing with the through post 142 when moving in the through hole 1421, and the service life of the device is prolonged. Guide rings are arranged between the piston 9 and the cylinder body 8 and between the firing pin 13 and the through column 142, so that the coaxiality between the cylinder body 8 and the piston 9 and between the firing pin 13 and the second end cover 14 can be corrected, the situation that the eccentricity of the piston 9 and the cylinder body 8 and the eccentricity of the through column 142 and the firing pin 13 are generated when the device is driven under high pressure and the sealing and injection effects of the system are affected is avoided, and therefore, the axial impact precision of the device can be improved and the service life of the device can be prolonged by arranging the guide rings.

In some embodiments, the cylinder 8 is provided with a first connecting channel 2 and a second connecting channel 10, and the air holes of the first connecting channel 2 and the second connecting channel 10 are provided with internal threads, so that the air pipes can be connected with the air pipes through connectors. One end air pipe of the high-pressure driving assembly is communicated with the first cavity 26 through the first connecting channel 2, the other end air pipe is communicated with the second cavity 23 through the second connecting channel 10, and a plurality of connecting channels are arranged on the cylinder body 8, so that an external high-pressure air source 6 can enter the first cavity 26 and the second cavity 23 of the device, and the piston 9 and the firing pin 13 are controlled to perform quick reciprocating stroke motion through high-pressure air.

In some embodiments, the injection mechanism further comprises a nozzle 15, wherein the nozzle 15 is detachably connected to the outer side of the second end cover 14, and the liquid medicine in the liquid suction cavity 16 is communicated with the outside through the arrangement of the nozzle 15 for spraying; in other embodiments, the aperture of the nozzle 15 may be set according to actual needs, and is not limited to the size of the present invention. The nozzle 15 improves the efficiency and practicality of injection by providing multiple sizes to vary the jet impact velocity.

In some embodiments, the injection mechanism further includes a liquid storage container 18, the second end cover 14 is provided with a communication hole 1411, the liquid storage container 18 is communicated with the liquid suction cavity 16 through the communication hole 1411, and a one-way valve 17 is disposed in the communication hole 1411 to limit the liquid medicine in the liquid storage container 18 to be unidirectionally delivered into the liquid suction cavity 16 through the communication hole 1411. In the embodiment, the liquid storage container 18 is arranged to provide stored liquid medicine for the injection mechanism, the liquid storage container 18 and the liquid suction cavity 16 are communicated through the communication hole 1411, and the flow direction of the liquid medicine is limited by arranging the one-way valve in the communication hole 1411, namely, the one-way valve 17 only allows the liquid medicine to flow from the liquid storage container 18 to the liquid suction cavity 16, so that the condition that the liquid medicine flows back in the injection process is effectively avoided, and the injection effect is influenced.

The working process of one embodiment is shown in schematic diagrams in fig. 2, 3 and 4, and is specifically as follows:

firstly, fig. 2 is a schematic diagram of an initial state, and as can be seen from fig. 2, in the initial state, the piston 9 is in a state of being close to the first end cover 1, at this time, the first cavity 26 is compressed, a certain amount of liquid medicine is loaded in the liquid suction cavity, the throttle valve 7 is opened, the gas in the high-pressure gas source 6 enters the first cavity 26 through the throttle valve 7 and the reversing valve 5 left through the first connecting pipe 2, the piston 9 moves axially to the right under the pushing of the high-pressure gas in the first cavity 26, the gas in the third cavity 22 is discharged into the second cavity 23 through the pressure relief hole 4, so as to maintain the pressure balance inside and outside the device, in this process, the first cavity 26 enters the high-pressure gas, the second cavity 23 discharges the low-pressure gas, and the first cavity 26 and the second cavity 23 can alternately enter and discharge. Next, as shown in fig. 3, which is a schematic diagram of a critical injection state, after the sealing plug 25 contacts with the striker 13 through a stroke gap in the piston 9, the sealing plug and the striker are moved together at a high speed along an axial direction, at this time, the check valve 17 is in a reverse blocking state, the liquid medicine in the liquid suction cavity 16 is ejected through the nozzle 15 arranged outside the second end cover 14 under the high-speed impact of the striker 13, the ejected liquid medicine has a very high impact speed and a smaller jet diameter, and the positions of all the components at the end of the impact injection process are shown in fig. 4, at this time, the liquid medicine in the liquid suction cavity 16 is completely injected to the outside.

After the injection operation is completed, the piston 9 and the striker 13 are both located axially adjacent the inner end face of the second endcap 14 in the cylinder 8, as shown in fig. 4. The reversing valve 5 is adjusted to the right position, high-pressure gas enters the second cavity 23 through the second connecting pipeline 10, the gas pushes the piston 9 and the sealing plug 25 to move back to the initial position close to the first end cover 1, the firing pin 13 is also driven by the piston 9 to return to the initial position, the liquid suction cavity 16 can generate huge negative pressure in the process, the one-way valve 17 is in a one-way conduction state, liquid medicine in the liquid storage container 18 can enter the liquid suction cavity 16 through the one-way valve 17 under huge pressure difference, and the perforation 152 of the nozzle 15 has negligible gas flow sucked due to small aperture. With the inhalation of the liquid medicine, the whole device is reset, and the relative positions of the parts of the device return to the initial state shown in fig. 2.

Example 1

In this embodiment, a high-pressure driving needleless injection device is used for delivering external liquid medicine to an individual intradermal space, and comprises a cylinder 8, an injection mechanism and a high-pressure driving assembly arranged outside the cylinder 8, wherein the left end of the cylinder 8 is connected with a first end cover 1, and the right end of the cylinder 8 is connected with a second end cover 14; the injection mechanism part is arranged in a space surrounded by the cylinder body 8, the first end cover 1 and the second end cover 14, and comprises a piston 9 and a firing pin 13, wherein the firing pin 13 is nested in the piston 9, and the piston 9 is nested in the cylinder body 8; the high-pressure driving assembly comprises a high-pressure air source 6 and a reversing valve 5, and a throttle valve 7 is arranged between the high-pressure air source 6 and the reversing valve 5; the high pressure drive assembly communicates with the interior of the cylinder 8 and provides the driving force for the injection mechanism. The injection mechanism further includes a liquid storage container 18, a communication hole 1411 is provided in the second cap 14, the liquid storage container 18 conveys the external liquid medicine into the communication hole 1411, the communication hole 1411 is connected to the liquid suction chamber 16, and a check valve 17 is provided between the liquid storage container 18 and the liquid suction chamber 16. A first seal ring 11 and a third seal ring 24 are arranged between the cylinder 8 and the piston 9, a fourth seal ring 27 is arranged between the first end cover 1 and the cylinder 8, a first cavity 26 is formed between the piston 9 and the first end cover 1 through the third seal ring 24 and the fourth seal ring 27 inside the cylinder 8, and a second cavity 23 is formed between the cylinder 8 and the piston 9 through the first seal ring 11 and the third seal ring 24. The cylinder 8 is provided with a first connecting channel 2 and a second connecting channel 10, one end of the high-pressure driving assembly is communicated with the first cavity 26 through the first connecting channel 2, the other end of the high-pressure driving assembly is communicated with the second cavity 23 through the second connecting channel 10, and the piston 9 is controlled to drive the firing pin 13 to perform reciprocating stroke motion in the through column 142 by controlling the pressure in the first cavity 26 and the second cavity 23. The second end cover 14 includes a cover body 141 and a through post 142 penetrating through the center of the cover body 141, a through hole 1421 is provided in the center of the through post 142, and the striker 13 can reciprocate in the through hole 1421; a second sealing ring 21 is arranged between the firing pin 13 and the through column 142, when the firing pin 13 moves in the through hole 1421, a liquid suction cavity 16 is formed between the right end of the firing pin 13 and the through column 142, and the liquid suction cavity 16 is used for absorbing and accommodating external liquid medicine; a third cavity 22 is formed between the piston 9, the striker 13 and the through post 142, and a pressure relief hole 4 is provided in the piston 9, the pressure relief hole 4 communicating the third cavity 22 with the second cavity 23. A seal plug 25 is provided coaxially with the striker 13 at one end of the piston 9, and a stroke gap is formed between the seal plug 25 and the striker 13. At least one guide ring is provided between the piston 9 and the cylinder 8, and at least one guide ring is provided between the striker 13 and the through post 142. The injection mechanism further comprises a nozzle 15, the nozzle 15 is detachably connected to the outer side of the second end cover 14, and the aperture of the nozzle 15 is 0.5mm, 0.3mm or 0.1mm, and in other embodiments, the corresponding size can be set according to the requirement.

As shown in fig. 9, which is a schematic perspective view of the second end cap 14 in embodiment 1, as can be seen from the drawing, through-posts 142 penetrating through the cap body 141 are provided on both sides of the center of the cap body 141 of the second end cap 14, through-holes 1421 are provided in the through-posts 142, specifically, a longer first through-post 1422 is provided on one side of the cap body 141, a shorter second through-post 1423 is provided on the opposite side, and the through-holes 1421 are provided through-holes in the first through-post 1422 and the second through-post 1423.

In this embodiment, the structure of the nozzle 15 adopts a conical-straight injection nozzle 15, as shown in fig. 5, which is a schematic cross-sectional view of the conical-straight injection nozzle 15; in this embodiment, the conical straight injection nozzle 15 includes a cylindrical body, one end of the interior of the body is provided with a non-penetrating connecting hole 154, the other end is provided with a frustum 151, and a hollow cone 153 and a perforation 152 are coaxially provided in sequence at the non-penetrating portion of the interior of the body.

The specific implementation mode is that the conical straight injection nozzle 15 is in screwed connection with a second through cylinder 1423 extending out of the outer side of the second end cover 14 through a connecting hole 154, specifically, the conical straight injection nozzle 15 is provided with internal threads, the second through cylinder 1423 is provided with external threads, and the fixation is realized through screwing of the internal threads and the external threads; such that throughbore 1421, hollow cone 153 and perforations 152 communicate coaxially to secure nozzle 15 to the device for injection. The tapered injection nozzle 15 is connected to the second through-hole cylinder 1423 with a shorter outer side of the second end cap 14 by screwing, so that the disassembly operation is relatively convenient, and the injection of the medicine liquid from the perforation 152 to the outside is ensured. The structure of the conical straight injection nozzle 15 influences the jet flow form, the hollow cone 153 structure with the shrinkage angle of 30 degrees is adopted in the structure, the design can reduce the energy loss to the greatest extent, the jet flow controllability of the conical straight injection nozzle 15 is better, the energy utilization rate is higher,

example 2

The structure of the high-pressure driven needleless injection device provided in this embodiment is substantially the same as that of the high-pressure driven needleless injection device provided in embodiment 1, and only the differences between the two are described herein, and the same points as those of embodiment 1 are not repeated.

This embodiment differs from embodiment 1 in that: the structure of the nozzle 15 is different, the structure of the second cap 14 is different, and the length of the striker 13 is different.

In this embodiment, the nozzle 15 is a flat-top injection nozzle 15, as shown in fig. 6, which is a schematic cross-sectional view of a three-dimensional structure of the flat-top injection nozzle 15; the flat-top injection nozzle 15 is a disc-shaped body, a connecting column 156 is arranged in the center of one side surface of the body, a liquid channel 157 penetrating through the center of the connecting column and the center of the flat-top injection nozzle 15 is arranged in the connecting column 156, a frustum 151 is coaxially arranged on the other side surface of the body and the disc-shaped body, a perforation 152 is arranged in the frustum 151, the perforation 152 is communicated with the liquid channel 157, and a plurality of bolt holes 155 are uniformly distributed on the flat-top injection nozzle 15.

The outer side of the second end cap 14 is a plane, i.e., the difference from embodiment 1 is that embodiment 2 does not provide the second through-hole pillar 1423, and does not use a screw-threaded manner to connect the nozzle, as shown in fig. 10, which is a schematic structural diagram of the second end cap 14 in embodiment 2, a through-hole pillar 142 is provided on one side of the cap body 141, and a through-hole 1421 is provided in the through-hole pillar 142.

In a specific embodiment, the connecting post 156 of the flat-top injection nozzle 15 is inserted into the through hole 1421, so that the liquid channel 157 is coaxially communicated with the through hole 1421, the left side surface of the flat-top injection nozzle 15 is attached to the outer side surface of the second end cover 14, the cover body 141 is provided with bolt holes matched with the bolt holes 155 on the flat-top injection nozzle 15, and a plurality of hexagon socket head cap bolts are inserted into the bolt holes 155 to lock the flat-top injection nozzle 15 and the second end cover 14, so that the nozzle 15 is fixed on the second end cover 14. Preferably, a fifth sealing ring 29, preferably an O-ring, is provided between the connecting post 156 and the second end cap 14 for ease of installation, to prevent leakage of the fluid in the fluid suction chamber 16 to the outside, to ensure that the fluid is injected only from the fluid passage 157 jet to the perforations 152.

As can be seen from fig. 2, 7 and the above description, the entire left side structure of the device of embodiment 1 is the same as that of embodiment 2, and since the specific structure of the nozzle 15 and the second cap 14 in embodiment 1 is different from that of embodiment 2, through posts 142 are provided on both sides of the second cap 14 in embodiment 1, the length of the right side nozzle 15 in embodiment 1 is greater than that of the right side nozzle 15 in embodiment 2, and the cylinder 8 and the piston 9 of the two embodiment devices are generally set to the same size, the length of the striker 13 in embodiment 2 should be smaller than that of the striker 13 in embodiment 1 in order to avoid interference.

The arrangement according to embodiment 2 achieves the same technical effects as in embodiment 1, and the flat top injection nozzle 15 is relatively simple to manufacture and is locked to the second end cap 14 by a bolt, so that the problem that the nozzle 15 in embodiment 1 cannot be used due to screw failure caused by screw connection is avoided. Meanwhile, a fifth sealing ring 29 for static sealing is arranged between the flat-top injection nozzle 15 and the second end cover 14, so that the sealing performance of the flat-top injection nozzle and the second end cover through bolt connection can be ensured.

Fig. 7 and 8 are schematic structural views of the high-pressure driven needleless injection device in the initial injection state and the completed injection state in embodiment 2, respectively, and the other structures are the same except for the specific structure of the nozzle 15, the length of the striker 13, and the connection manner of the nozzle 15 and the second end cap 14, and are not repeated.

It should be understood that references to upper, lower, left, right, front, rear, front, back, top, bottom, etc. in this specification or as may be referred to are intended to be defined with respect to the configurations shown in the various figures, as opposed to concepts, which may be adapted for use in a variety of different positions and in a variety of different orientations. These and other directional terms should not be construed as limiting terms.

While the invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes, modifications and additions may be made without departing from the scope of the invention. Equivalent embodiments of the present application are well known to those skilled in the art to which the present invention pertains, when made with the aid of the teachings disclosed herein; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present application still fall within the scope of the technical solution of the present application.

Claims (5)

1. A high pressure driven needleless injection device for delivering an external medical fluid to an intradermal space of an individual comprising:

the device comprises a cylinder body (8), wherein one end of the cylinder body (8) is connected with a first end cover (1), and the other end of the cylinder body (8) is connected with a second end cover (14);

the injection mechanism is partially arranged in a space surrounded by the cylinder body (8), the first end cover (1) and the second end cover (14), and comprises a piston (9) and a firing pin (13), wherein the firing pin (13) is nested in the piston (9), and the piston (9) is nested in the cylinder body (8);

and a high-pressure drive assembly mounted outside the cylinder (8), the high-pressure drive assembly communicating to the inside of the cylinder (8) and providing a driving force for the injection mechanism;

a first sealing ring (11) and a third sealing ring (24) are arranged between the cylinder body (8) and the piston (9), a fourth sealing ring (27) is arranged between the first end cover (1) and the cylinder body (8), a first cavity (26) is formed between the piston (9) and the first end cover (1) through the third sealing ring (24) and the fourth sealing ring (27) inside the cylinder body (8), and a second cavity (23) is formed between the cylinder body (8) and the piston (9) in a sealing manner through the first sealing ring (11) and the third sealing ring (24);

a first connecting channel (2) and a second connecting channel (10) are arranged on the cylinder body (8), one end of the high-pressure driving assembly is communicated with the first cavity (26) through the first connecting channel (2), the other end of the high-pressure driving assembly is communicated with the second cavity (23) through the second connecting channel (10), and the piston (9) is controlled to drive the firing pin (13) to perform reciprocating stroke motion in the through column (142) by controlling the pressure in the first cavity (26) and the pressure in the second cavity (23);

the high-pressure driving assembly comprises a high-pressure air source (6) and a reversing valve (5);

the second end cover (14) comprises a cover body (141) and a through column (142) which is arranged in the center of the cover body (141) in a penetrating way, a through hole (1421) is arranged in the center of the through column (142), and the firing pin (13) can be inserted into the through hole (1421) to perform reciprocating motion; a second sealing ring (21) is arranged between the firing pin (13) and the through column (142), when one end of the firing pin (13) moves in the through hole (1421), a liquid suction cavity (16) is formed between the other end of the firing pin (13) and the through column (142), and the liquid suction cavity (16) is used for absorbing and accommodating external liquid medicine; a third cavity (22) is formed among the piston (9), the firing pin (13) and the through column (142), and a pressure relief hole (4) is formed in the piston (9), and the pressure relief hole (4) communicates the third cavity (22) with the second cavity (23);

a sealing plug (25) is coaxially arranged at one end of the piston (9) and the firing pin (13), and a stroke gap is formed between the sealing plug (25) and the firing pin (13);

the injection mechanism further comprises a nozzle (15), the nozzle (15) being detachably connected to the outside of the second end cap (14).

2. The high-pressure driven needleless injection device of claim 1, in which at least one guide ring is provided between the piston (9) and the cylinder (8) and between the striker (13) and the post (142).

3. The high pressure driven needleless injection device of claim 2, in which the nozzle (15) is flat-topped or tapered in shape.

4. The high-pressure driven needleless injection device as in claim 1, wherein the injection mechanism further comprises a liquid storage container (18), a communication hole (1411) is formed in the second end cover (14), the liquid storage container (18) is communicated with the liquid suction cavity (16) through the communication hole (1411), and a one-way valve (17) is arranged in the communication hole (1411) so as to limit the liquid medicine in the liquid storage container (18) to be conveyed into the liquid suction cavity (16) through the communication hole (1411) in a one-way mode.

5. A high pressure driven needleless injection device as in claim 1, in which a throttle valve (7) is provided between the high pressure gas source (6) and the reversing valve (5).