Multi-head needleless injector

Abstract

The invention relates to the field of medical equipment, and particularly discloses a multi-head needleless injector which comprises an injector body, an injection head and a liquid supply mechanism, the interior of the injector body is divided into a main liquid cavity and a liquid outlet cavity through a partition plate, the main liquid cavity is provided with a liquid driving plug, and a one-way flow dividing disc is arranged in the liquid outlet cavity; the injection head is provided with more than three injection nozzles, the one-way shunting disc is provided with a confluence cavity and diversion channels, and the diversion channels are in one-to-one correspondence with the injection nozzles and are communicated with the confluence cavity and the injection nozzles; a communicating hole is formed in the partition plate, and a first blocking structure capable of sealing the communicating hole is arranged on the back face of the one-way flow dividing disc; a second blocking structure is arranged in the liquid supply mechanism and allows liquid to flow into the main liquid cavity from the medicine bottle installation base in a one-way mode. By the adoption of the needle-free injection device, it can be guaranteed that the speed of liquid medicine sprayed out of each injection nozzle is uniform, liquid drops are uniform in size, and the injection stability is guaranteed while the needle-free injection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a multi-head needle-free syringe. Background Art

[0002] A needle-free injector (also known as a jet injector) is a medical device that uses high pressure to convert medication into a fine stream of liquid, directly penetrating the skin and into the subcutaneous tissue. Existing needle-free injectors typically have a single injection head, allowing for single-point injections at a time and resulting in low injection efficiency. Some needle-free injectors feature dual injection heads, each connected to the main flow channel via a branch flow channel. This influences the internal conditions of the branch flow channel, resulting in inconsistent injection speeds, which in turn affects the effectiveness of the medication. Summary of the Invention

[0003] In order to solve the defects of the prior art, the present invention provides a multi-head needle-free syringe, which can ensure that the speed of the liquid sprayed from each injection nozzle is uniform and the droplet size is uniform, thereby improving the efficiency of needle-free injection while ensuring injection stability.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a multi-head needle-free syringe, including a syringe body, an injection head and a liquid supply mechanism, the syringe body is divided into a main liquid chamber and a liquid outlet chamber by a partition plate, the main liquid chamber is provided with a liquid driving plug, and the liquid outlet chamber is provided with a one-way diverter disk; the injection head is provided with more than 3 injection nozzles, the one-way diverter disk has a confluence chamber and a guide channel, the guide channel corresponds one-to-one with the injection nozzle, and connects the confluence chamber and the injection nozzle; the partition plate is provided with a connecting hole, and the back of the one-way diverter disk is provided with a first blocking structure capable of closing the connecting hole; one end of the liquid supply mechanism is connected to the main liquid chamber, and the other end is provided with a medicine bottle mounting seat, and a second blocking structure is provided in the liquid supply mechanism, and the second blocking structure allows liquid to flow from the medicine bottle mounting seat into the main liquid chamber in one direction.

[0005] As an improvement of the above solution, the injection nozzle includes a conical pressure chamber and a first cylindrical chamber located at the bottom of the conical pressure chamber.

[0006] As an improvement to the above solution, a guide column is provided at the center of the front of the one-way diverter disk, and the injection head is provided with a guide groove matching the guide column; a first spring is provided between the first cylindrical cavity and the one-way diverter disk.

[0007] As an improvement of the above-mentioned solution, a flow-limiting disc is provided on the front of the one-way diverter disc corresponding to the first cylindrical cavity, and a flow-limiting column is provided on the flow-limiting disc, and the flow-limiting column extends into the first cylindrical cavity; the first spring is provided in the first cylindrical cavity and abuts against the flow-limiting disc.

[0008] As an improvement of the above solution, a flow limiting disc is provided on the front of the one-way diverter disc corresponding to the first cylindrical cavity, and a second cylindrical cavity is provided on the flow limiting disc; one end of the first spring is provided in the first cylindrical cavity, and the other end is provided in the second cylindrical cavity.

[0009] As an improvement to the above solution, the first sealing structure is a rubber plug provided on the back of the one-way diverter disc, and the rubber plug is provided with a conical tip, and the conical tip is used to close the connecting hole; or, the first sealing structure is a first sealing ring provided on the back of the flow limiting disc.

[0010] As an improvement to the above solution, the side surface of the flow limiting disc is provided with a guide groove extending from the back surface to the front surface thereof; there are 4 groups of the guide grooves, which are circumferentially arranged on the side surface of the flow limiting disc.

[0011] As an improvement of the above solution, the flow limiting disc extends to the back of the one-way diverter disc, thereby forming the confluence cavity on the side of the one-way diverter disc; the flow limiting discs are evenly arranged circumferentially and connected to the axis column located at the axis center through ribs.

[0012] As an improvement to the above-mentioned solution, the second sealing structure includes a round ball, a second spring and an arc surface seat, the arc surface seat is provided with a concave arc surface at one end facing the main liquid chamber, the liquid supply mechanism is provided with a liquid supply chamber, the round ball is provided in the liquid supply chamber and is located in the concave arc surface, and the second spring is provided between the round ball and the liquid supply chamber.

[0013] As an improvement to the above solution, the second blocking structure includes a valve core and a valve core sleeve, the valve core sleeve is provided with a guide inner wall and a tapered opening, the valve core is provided with a guide portion cooperating with the guide inner wall, and a disc portion connected to the guide portion;

[0014] The guide portion is provided with a liquid supply channel connected from its bottom surface to the side surface; a second sealing ring is provided at the connection between the disc body and the guide portion, and the second sealing ring can abut against the surface of the tapered port to seal the valve core sleeve;

[0015] A second return spring is provided at one end of the disc body facing the main liquid chamber; and an inner recess is provided in the disc body for partially accommodating the second return spring.

[0016] The implementation of the embodiments of the present invention has the following beneficial effects:

[0017] The injection head of this embodiment has four injection nozzles, evenly distributed around the head. A one-way diverter disc controls the flow of liquid from the liquid outlet chamber to the injection nozzles, diverting the liquid flowing through the one-way diverter disc. This ensures that each nozzle sprays liquid at a uniform velocity and droplet size, improving the efficiency of needle-free injection while ensuring injection stability.

[0018] The injection nozzle of the present application is provided with an injection nozzle including a conical pressure chamber and a first cylindrical cavity located at the bottom of the conical pressure chamber. During the movement of the one-way diverter disk, the diameter of the flow limiting disk is larger than the diameter of the first cylindrical cavity. When it approaches the opening of the first cylindrical cavity, it can limit the liquid in the first cylindrical cavity from flowing to the confluence cavity; the flow limiting column extends into the first cylindrical cavity, occupies the space of the first cylindrical cavity, forms a thrust locally, and presses the liquid in the first cylindrical cavity out of the injection nozzle; and the one-way diverter disk is positioned by the guide column, which can ensure that the flow limiting column in the first cylindrical cavity moves synchronously, thereby improving the consistency of the liquid flow rate sprayed from the injection nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a first embodiment of a multi-head needle-free syringe according to the present invention;

[0020] Figure 2 is a cross-sectional view of a first embodiment of a multi-head needle-free syringe of the present invention;

[0021] Figure 3 yes Figure 2 A magnified view of part A;

[0022] Figure 4 This is a schematic structural diagram of a one-way diverter disk according to a first embodiment of the present invention;

[0023] Figure 5 is a cross-sectional view of a second embodiment of a multi-head needle-free syringe of the present invention;

[0024] Figure 6 2 is a schematic structural diagram of a one-way diverter disk according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear herein are based solely on the accompanying drawings and are not intended to limit the present invention.

[0026] like Figure 1-Figure 4As shown, a specific embodiment of the present invention provides a multi-head needle-free syringe, including a syringe body 1, an injection head 2 and a liquid supply mechanism 3, the syringe body 1 is divided into a main liquid chamber 12 and a liquid outlet chamber 13 by a partition plate 11, the main liquid chamber 12 is provided with a liquid drive plug 14, and the liquid outlet chamber 13 is provided with a one-way diverter disk 4; the injection head 2 is provided with more than three injection nozzles 21, the one-way diverter disk 4 has a confluence chamber 41 and a guide channel 42, the guide channel 42 corresponds one-to-one with the injection nozzle 21, and connects the confluence chamber 41 and the injection nozzle 21; the partition plate 11 is provided with a connecting hole 111, and the back of the one-way diverter disk 4 is provided with a first blocking structure 5 capable of closing the connecting hole 111; one end of the liquid supply mechanism 3 is connected to the main liquid chamber 12, and the other end is provided with a medicine bottle mounting seat 31, and a second blocking structure 6 is provided in the liquid supply mechanism 3, which allows liquid to flow from the medicine bottle mounting seat 31 into the main liquid chamber 12 in one direction.

[0027] The injection head 2 of this embodiment has four injection nozzles 21, which are evenly distributed around the circumference of the injection head 2. A one-way diverter disk 4 controls the flow of liquid in the liquid outlet cavity 13 to the injection nozzles 21 in a single direction. The liquid flowing through the one-way diverter disk 4 is diverted to ensure that the liquid sprayed from each injection nozzle 21 has a uniform velocity and droplet size, thereby improving the efficiency of needle-free injection while ensuring injection stability.

[0028] Preferably, the injection nozzle 21 includes a conical pressurizing chamber 211 and a first cylindrical chamber 212 located at the bottom of the conical pressurizing chamber 211. The diameter of the first cylindrical chamber 212 is larger than the diameter of the bottom surface of the conical pressurizing chamber 211, and can accommodate a large amount of liquid to be supplied to the conical pressurizing chamber 211 for pressurized spraying, thereby preventing the liquid from being reduced in a short period of time during spraying from the conical pressurizing chamber 211, thereby affecting spray uniformity.

[0029] According to the first embodiment of the present invention, a guide column 44 is provided in the center of the front of the one-way diverter disk 4, and the injection head 2 is provided with a guide groove 22 matching the guide column 44; a first spring 45 is provided between the first cylindrical cavity 212 and the one-way diverter disk 4.

[0030] It should be noted that the guide column 44 is used to locate the axis of the one-way diverter disk 4 , and cooperates with the guide groove 22 to ensure that the axis of the one-way diverter disk 4 is located at a predetermined position of the injection head 2 .

[0031] To ensure that the flow rate of each injection nozzle 21 is approximately the same, a flow-restricting disc 43 is installed on the front of the one-way diverter disc 4, corresponding to the first cylindrical cavity 212. A flow-restricting post 46 is installed on the flow-restricting disc 43, which extends into the first cylindrical cavity 212. A first spring 45 is located in the first cylindrical cavity 212 and abuts against the flow-restricting disc 43. During injection, the liquid-driving plug 14 moves toward the injection head 2, pushing the liquid in the main liquid chamber 12 into the liquid outlet chamber 13. During this process, the one-way diverter disc 4 is also pushed by the liquid, moving toward the injection nozzle 21. The liquid in the liquid outlet chamber 13 is divided by the confluence chamber 41 of the one-way diverter disc 4, and is roughly divided into four streams that flow to the corresponding injection nozzles 21. However, due to variations in the diameter of the injection nozzles 21 at different locations, the final injection velocity of the liquid flowing to the injection nozzle 21 at the same pressure in the confluence chamber 41 may also vary. The injection nozzle 21 of the present application is provided with an injection nozzle 21 including a conical pressurizing chamber 211 and a first cylindrical chamber 212 located at the bottom of the conical pressurizing chamber 211. During the movement of the one-way diverter disk 4, the diameter of the flow limiting disk 43 is larger than the diameter of the first cylindrical chamber 212. When it is close to the opening of the first cylindrical chamber 212, it can limit the liquid in the first cylindrical chamber 212 from flowing to the confluence chamber 41; the flow limiting column 46 extends into the first cylindrical chamber 212, occupies the space of the first cylindrical chamber 212, and forms a thrust locally to press the liquid in the first cylindrical chamber 212 out of the injection nozzle 21; and the one-way diverter disk 4 is positioned by the guide column 44, which can ensure that the flow limiting column 46 in the first cylindrical chamber 212 moves synchronously, thereby improving the consistency of the liquid flow rate sprayed from the injection nozzle 21.

[0032] The first blocking structure 5 is a rubber plug 51 provided on the back side of the one-way diverter plate 4 . The rubber plug 51 is provided with a tapered tip 511 . The tapered tip 511 is used to seal the communication hole 111 .

[0033] The flow-restricting discs 43 extend to the back of the one-way diverter disc 4, thereby forming the confluence cavity 41 on the side of the one-way diverter disc 4. The flow-restricting discs 43 are evenly arranged circumferentially and connected to an axial column 48 located at the axis via ribs 47. The ribs 47 cooperate with the flow-restricting discs 43 to divide the space into different chambers for supplying liquid to the injection nozzles 21, thereby avoiding uneven injection velocities at the injection nozzles 21 due to different resistances of different injection nozzles 21 when liquid is supplied through the mixing chamber.

[0034] The second sealing structure 6 includes a round ball 61, a second spring 62 and an arc seat 63. The arc seat 63 is provided with a concave arc surface 631 at one end facing the main liquid chamber 12. The liquid supply mechanism 3 is provided with a liquid supply chamber 32. The round ball 61 is provided in the liquid supply chamber 32 and is located in the concave arc surface 631. The second spring 62 is provided between the round ball 61 and the liquid supply chamber 32.

[0035] The working principle of this embodiment is described in detail below:

[0036] Liquid extraction: The power source drives the liquid drive plug 14 to move backward, and the one-way diverter disk 4 closes the connecting hole 111 through the conical tip 511 of the rubber plug 51; the ball 61 of the liquid supply mechanism 3 moves downward under the negative pressure of the main liquid chamber 12, connecting the medicine bottle mounting seat 31 with the main liquid chamber 12. A medicine bottle is mounted on the medicine bottle mounting seat 31, and the liquid medicine in the medicine bottle enters the main liquid chamber 12.

[0037] Injection: The power source drives the liquid-driven plug 14 forward. The ball 61 of the liquid supply mechanism 3 presses against the concave arc surface 631 of the arc seat 63 under the positive pressure of the main liquid chamber 12, preventing the liquid from reversely entering the medicine bottle and contaminating the medicine bottle. The one-way diverter disc 4 moves toward the injection nozzle 21 under the push of the liquid in the main liquid chamber 12. The rubber plug 51 separates from the connecting hole 111. The connecting hole 111 passes the liquid in the main liquid chamber 12 into the liquid outlet chamber 13. The liquid in the liquid outlet chamber 13 is ejected outward through the confluence chamber 41, the first cylindrical chamber 212, and the conical pressurized chamber 211. When the liquid enters the first cylindrical chamber 212, the flow-limiting column 46 and the flow-limiting disc 43 cooperate to synchronously reduce the volume of the first cylindrical chamber 212, so that the liquids of different injection nozzles 21 are ejected at approximately the same speed.

[0038] Combine Figure 5 and Figure 6 As shown, according to the second embodiment of the present invention, the difference from the first embodiment is that a flow limiting disc 43 is provided on the front of the one-way diverter disc 4 corresponding to the first cylindrical cavity 212, and a second cylindrical cavity 431 is provided on the flow limiting disc 43; one end of the first spring 45 is provided in the first cylindrical cavity 212, and the other end is provided in the second cylindrical cavity 431. The one-way diverter disc 4 is positioned by the cooperation of the first spring 45 with the first cylindrical cavity 212 and the second cylindrical cavity 431. The one-way diverter disc 4 will not rub against other limiting mechanisms during its movement, and the movement is smooth. The second cylindrical cavity 431 can also serve as a buffer space for the liquid to prevent the liquid from turning 90 degrees when entering the first cylindrical cavity 212 from the confluence cavity 41, causing turbulence and affecting the spray stability of the liquid.

[0039] Preferably, the side of the flow-restricting disc 43 is provided with guide grooves 432 extending from its back to its front. There are four sets of guide grooves 432, which are circumferentially arranged on the side of the flow-restricting disc 43. By providing these guide grooves 432, when liquid flows through the confluence chamber 41, it will flow along the guide grooves 432. On the one hand, this ensures the smooth forward and backward movement of the one-way diverter disc 4, preventing the suspended one-way diverter disc 4 from colliding with the cavity wall of the liquid outlet cavity 13. On the other hand, it can guide the liquid into the first cylindrical cavity 212, preventing the liquid in the confluence chamber 41 from flowing disorderly.

[0040] In some embodiments, the first blocking structure 5 is a first sealing ring 52 provided on the back of the flow limiting disc 43. The first sealing ring 52 can abut against the extension of the communication hole 111 to ensure sealing between the communication hole 111 and the flow limiting disc 43.

[0041] Preferably, the second blocking structure 6 includes a valve core 64 and a valve core sleeve 65, the valve core sleeve 65 is provided with a guide inner wall 651 and a tapered opening 652, the valve core 64 is provided with a guide portion 641 matched with the guide inner wall 651, and a disc portion 642 connected to the guide portion 641;

[0042] The guide portion 641 is provided with a liquid supply channel 643 extending from its bottom surface to its side surface; a second sealing ring 66 is provided at the connection between the disc portion 642 and the guide portion 641. The second sealing ring 66 can abut against the surface of the tapered opening 652 to seal the valve core sleeve 65;

[0043] A second return spring 67 is provided at one end of the disc body 642 facing the main liquid chamber 12 ; and an inner recess 644 is provided in the disc body 642 for partially accommodating the second return spring 67 .

[0044] The valve core 64 slides along the inner wall of the valve core sleeve 65 under the restraining action of the guide inner wall 651. The tapered opening 652, the disc portion 642, and the guide portion 641 form a triangular cross-section that quickly blocks the flow of liquid. By controlling the liquid flow cross-section, the sense of frustration when closing and opening the flow channel can be reduced, improving the operator's operating precision.

[0045] The working principle of this embodiment is described in detail below:

[0046] Liquid extraction: The power source drives the liquid drive plug 14 to move backward, the one-way diverter disk 4 abuts against the connecting hole 111, and the connecting hole 111 is closed by the first sealing ring 52; the valve core 64 of the liquid supply mechanism 3 moves downward under the negative pressure of the main liquid chamber 12, connecting the medicine bottle mounting seat 31 with the main liquid chamber 12, and a medicine bottle is installed on the medicine bottle mounting seat 31. The liquid in the medicine bottle enters the main liquid chamber 12 through the liquid supply channel 643.

[0047] Injection: The power source drives the liquid-driven plug 14 forward. The valve core 64 of the liquid supply mechanism 3 is reset under the action of the second return spring 67 and the liquid. The disc body 642 presses the second sealing ring 66 against the tapered opening 652 to prevent the liquid from flowing back into the medicine bottle. The one-way diverter disc 4 moves toward the injection nozzle 21 under the push of the liquid in the main liquid chamber 12. The first sealing ring 52 separates from the connecting hole 111. The connecting hole 111 passes the liquid in the main liquid chamber 12 into the liquid outlet chamber 13. The liquid in the liquid outlet chamber 13 is ejected outward through the confluence chamber 41, the first cylindrical chamber 212, and the tapered pressurized chamber 211. When the liquid enters the first cylindrical chamber 212, part of the liquid enters the second cylindrical chamber 431 for buffering and sorting, so that the liquid ejected from the injection nozzle 21 is stable and smooth.

[0048] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A multi-head needle-free syringe, characterized in that: It includes a syringe body, an injection head and a liquid supply mechanism. The syringe body is divided into a main liquid chamber and a liquid outlet chamber by a partition plate. The main liquid chamber is provided with a liquid drive plug, and the liquid outlet chamber is provided with a one-way diverter disk. The injection head is provided with more than three injection nozzles, the one-way diverter plate has a confluence cavity and a flow guide channel, the flow guide channel corresponds to the injection nozzles one by one, and connects the confluence cavity and the injection nozzles; The partition plate is provided with a communication hole, and the back of the one-way diverter plate is provided with a first blocking structure capable of closing the communication hole; One end of the liquid supply mechanism is connected to the main liquid cavity, and the other end is provided with a medicine bottle mounting seat. A second blocking structure is provided in the liquid supply mechanism, and the second blocking structure allows liquid to flow into the main liquid cavity from the medicine bottle mounting seat in one direction.

2. The multi-head needle-free syringe according to claim 1, characterized in that: The injection nozzle includes a conical pressurizing cavity and a first cylindrical cavity located at the bottom of the conical pressurizing cavity.

3. The multi-head needle-free syringe according to claim 2, characterized in that: A guide column is provided at the center of the front of the one-way diverter disc, and the injection head is provided with a guide groove matching the guide column; a first spring is provided between the first cylindrical cavity and the one-way diverter disc.

4. The multi-head needle-free syringe according to claim 3, characterized in that: A flow-limiting disc is provided on the front of the one-way diverter disc corresponding to the first cylindrical cavity. A flow-limiting column is provided on the flow-limiting disc, and the flow-limiting column extends into the first cylindrical cavity. The first spring is provided in the first cylindrical cavity and abuts against the flow-limiting disc.

5. The multi-head needle-free syringe according to claim 2, characterized in that: A flow limiting disc is provided on the front of the one-way diverter disc corresponding to the first cylindrical cavity, and a second cylindrical cavity is provided on the flow limiting disc; one end of the first spring is provided in the first cylindrical cavity, and the other end is provided in the second cylindrical cavity.

6. The multi-head needle-free syringe according to claim 1, wherein: The first sealing structure is a rubber plug provided on the back of the one-way diverter disc, and the rubber plug is provided with a conical tip, and the conical tip is used to close the connecting hole; or, the first sealing structure is a first sealing ring provided on the back of the flow limiting disc.

7. The multi-head needle-free syringe according to claim 5, characterized in that: The side surface of the flow-limiting disc is provided with a guide groove extending from the back surface to the front surface thereof; there are 4 groups of the guide grooves, which are circumferentially arranged on the side surface of the flow-limiting disc.

8. The multi-head needle-free syringe according to claim 4 or 5, characterized in that: The flow limiting disc extends to the back of the one-way diverter disc, thereby forming the confluence cavity on the side of the one-way diverter disc; the flow limiting discs are evenly arranged in the circumferential direction and connected to the axis column arranged at the axis through ribs.

9. The multi-head needle-free syringe according to claim 1, wherein: The second sealing structure includes a round ball, a second spring and an arc seat. The arc seat is provided with a concave arc surface at one end facing the main liquid chamber. The liquid supply mechanism is provided with a liquid supply chamber. The round ball is provided in the liquid supply chamber and is located in the concave arc surface. The second spring is provided between the round ball and the liquid supply chamber.

10. The multi-head needle-free syringe according to claim 1, wherein: The second blocking structure includes a valve core and a valve core sleeve, the valve core sleeve is provided with a guide inner wall and a tapered opening, the valve core is provided with a guide portion matched with the guide inner wall, and a disc portion connected to the guide portion; The guide portion is provided with a liquid supply channel connected from its bottom surface to the side surface; a second sealing ring is provided at the connection between the disc body and the guide portion, and the second sealing ring can abut against the surface of the tapered port to seal the valve core sleeve; A second return spring is provided at one end of the disc body facing the main liquid chamber; and an inner recess is provided in the disc body for partially accommodating the second return spring.

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