Multi-head needleless injector with uniform firing rate

Abstract

The utility model relates to medical equipment field, concretely discloses a multi -head needleless injector of even rate of fire, including injector body, injection head and liquid supply mechanism, the injector body is separated into main liquid cavity and liquid outlet cavity through the partition board in, main liquid cavity is equipped with liquid drive plug, is equipped with one -way shunt disc in the liquid outlet cavity, one -way shunt disc back is equipped with first plugging structure, the liquid supply mechanism is equipped with second plugging mechanism in, one -way shunt disc is equipped with guide post, injection head is equipped with guide slot, second plugging mechanism includes ball, second spring and cambered surface seat, cambered surface seat has first clamping ring and quick -joint part, cambered surface seat outside still is equipped with spinning pressure spare, spinning pressure spare has second clamping ring, adopt the utility model, can guarantee the speed uniformity of every injection nozzle spouts liquid medicine, drop size is even, improves the efficiency of needleless injection and guarantees injection stability.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a multi-head needleless injector with uniform injection speed. Background Technology

[0002] Needle-free injectors (also known as jet injectors) are medical devices that use high pressure to convert drugs into micro-fluid streams, allowing them to directly penetrate the skin and enter subcutaneous tissue. Current needle-free injectors generally have only one injection head, enabling single-point injections with low efficiency. Some needle-free injectors with dual injection heads have branch channels connected to the main channel. However, the different injection heads are affected by the internal conditions of the branch channels, resulting in inconsistent drug jet speeds and impacting the drug's effectiveness. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a multi-head needleless injector with uniform injection speed, ensuring that the speed of the liquid ejected from each nozzle is consistent and the droplet size is uniform, thereby improving the efficiency of needleless injection while ensuring injection stability.

[0004] To solve the above-mentioned technical problems, this utility model provides a multi-head needleless injector with uniform injection speed, including an injector body, an injection head and a liquid supply mechanism. The injector body is divided into a main liquid chamber and an outlet liquid chamber by a partition plate. The main liquid chamber is provided with a liquid driving plug and the outlet liquid chamber is provided with a one-way flow divider. The partition plate is provided with a connecting hole, and the back of the one-way diverter is provided with a first sealing structure that can close 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. The liquid supply mechanism is provided with a second sealing structure, which allows liquid to flow into the main liquid chamber from the medicine bottle mounting seat in one direction. The unidirectional flow divider is provided with a guide post on its front side, and the injection head is provided with a guide groove that matches the guide post. The second sealing structure includes a ball, a second spring, and an arc-shaped seat, wherein the ball is disposed on the arc-shaped seat; The arc-shaped seat has a first snap-fit ​​ring and a quick-connect part. The arc-shaped seat is also provided with a spinning part, which has a second snap-fit ​​ring that cooperates with the first snap-fit ​​ring.

[0005] As an improvement to the above solution, the quick-connect part has a clearance groove, and the second snap ring is located in the clearance groove.

[0006] As an improvement to the above solution, the arc-shaped seat has a concave arc surface at one end facing the main liquid cavity, the liquid supply mechanism has a liquid supply cavity, the ball is disposed in the liquid supply cavity and located in the concave arc surface, and the second spring is provided between the ball and the liquid supply cavity.

[0007] As an improvement to the above solution, the injection nozzle includes a conical pressure chamber and a first cylindrical cavity located at the bottom of the conical pressure chamber.

[0008] As an improvement to the above solution, a first spring is provided between the first cylindrical cavity and the unidirectional flow divider.

[0009] As an improvement to the above solution, a flow-limiting disk is provided on the front of the unidirectional flow-diverting disk corresponding to the first cylindrical cavity, and a flow-limiting column is provided on the flow-limiting disk, the flow-limiting column extending into the first cylindrical cavity; the first spring is provided in the first cylindrical cavity and abuts against the flow-limiting disk.

[0010] As an improvement to the above solution, the first sealing structure is a rubber plug located on the back of the one-way diverter plate. The rubber plug has a conical tip, which is used to close the connecting hole.

[0011] As an improvement to the above scheme, the flow-limiting disk extends to the back of the unidirectional flow-diverting disk, thereby forming a confluence cavity on the side of the unidirectional flow-diverting disk.

[0012] As an improvement to the above scheme, the flow-limiting disks are evenly arranged circumferentially and connected to the central column located at the axis through ribs.

[0013] Implementing the embodiments of this utility model has the following beneficial effects: In this embodiment, the injection nozzles are evenly distributed circumferentially on the injection head. A one-way flow divider controls the liquid in the dispensing chamber to flow only unidirectionally towards the injection nozzle, and diverts the liquid flowing through the one-way flow divider to ensure that the speed of the medication ejected from each injection nozzle is uniform, and the droplet size is consistent, thus improving the efficiency of needle-free injection while ensuring injection stability.

[0014] The injection nozzle of this application includes a conical pressurizing chamber and a first cylindrical cavity located at the bottom of the conical pressurizing chamber. During the movement of the unidirectional flow divider, the diameter of the flow-limiting disc is larger than the diameter of the first cylindrical cavity. When it approaches the opening of the first cylindrical cavity, it can restrict the flow of liquid in the first cylindrical cavity to the confluence cavity. The flow-limiting column extends into the first cylindrical cavity, occupies the space of the first cylindrical cavity, and forms a thrust locally to force the liquid in the first cylindrical cavity out of the injection nozzle. The unidirectional flow divider 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 ejected from the injection nozzle.

[0015] The arc-shaped seat described in this application has a first retaining ring and a quick-connect part. A spinning member is also provided outside the arc-shaped seat, and the spinning member has a second retaining ring that mates with the first retaining ring. The second retaining ring presses the first retaining ring firmly onto the syringe body, making disassembly and assembly convenient and facilitating routine internal cleaning and maintenance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of the multi-head needleless injector with uniform firing rate according to the present invention; Figure 2 This is a cross-sectional view of an embodiment of the multi-head needleless injector with uniform injection speed according to this utility model; Figure 3 This is a cross-sectional view of an embodiment of the liquid supply mechanism of this utility model; Figure 4 yes Figure 2 Enlarged view of part A; Figure 5 This is a schematic diagram of a unidirectional flow divider structure according to an embodiment of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings. It is hereby declared that the terms "up," "down," "left," "right," "front," "back," "inner," and "outer," etc., appearing or about to appear in this document, are based solely on the accompanying drawings and are not intended to specifically limit this utility model.

[0018] like Figures 1-5 As shown in the figure, a specific embodiment of this utility model provides a multi-head needleless injector with uniform injection speed, including an injector body 1, an injection head 2, and a liquid supply mechanism 3. The injector body 1 is divided into a main liquid chamber 12 and an outlet liquid chamber 13 by a partition plate 11. The main liquid chamber 12 is provided with a liquid driving plug 14, and the outlet liquid chamber 13 is provided with a one-way diverting plate 4. The injection head 2 is provided with three or more injection nozzles 21. The one-way diverting plate 4 has a confluence chamber 41 and a guide channel 42. The guide channel 42 corresponds one-to-one with the injection nozzles 21 and connects the confluence chamber 41 and the injection nozzles 21. The partition plate 11 is provided with a connecting hole 111. The back of the one-way diverting plate 4 is provided with a first sealing structure 5 that can close 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. The liquid supply mechanism 3 is provided with a second sealing structure 6, which allows liquid to flow unidirectionally from the medicine bottle mounting seat 31 into the main liquid chamber 12.

[0019] In this embodiment, the injection head 2 has four injection nozzles 21, which are evenly distributed circumferentially on the injection head 2. The liquid in the liquid outlet chamber 13 is controlled by the one-way diversion plate 4 to flow only unidirectionally to the injection nozzles 21, and the liquid flowing through the one-way diversion plate 4 is diverted to ensure that the speed of the liquid sprayed from each injection nozzle 21 is uniform and the droplet size is uniform, thereby improving the efficiency of needle-free injection while ensuring injection stability.

[0020] The second sealing structure 6 includes a ball 61, a second spring 62, and an arc-shaped seat 63. The arc-shaped seat 63 has a first locking ring 632 and a quick-connect part 633. A spinning member 64 is also provided outside the arc-shaped seat 63. The spinning member 64 has a second locking ring 641 that cooperates with the first locking ring 632 and can be connected to the syringe body 1 via threads. One end of the arc-shaped seat 63 facing the main liquid chamber 12 has a concave arc surface 631. The liquid supply mechanism 3 has a liquid supply chamber 32. The ball 61 is located in the liquid supply chamber 32 and within the concave arc surface 631. The second spring 62 is provided between the ball 61 and the liquid supply chamber 32. The second locking ring 641 presses the first locking ring 632 onto the syringe body 1, facilitating disassembly and assembly and routine internal cleaning and maintenance.

[0021] Preferably, the quick-connect part 633 has a relief groove 634, and the second locking ring 641 is located in the relief groove 634. By providing the relief groove 634, on the one hand, the liquid supply tube connected to the medicine bottle can be reliably connected to the quick-connect part 633, and the quick-connect part 633 and the external spin-forming part 64 form the medicine bottle mounting base 31, preventing the liquid supply tube from coming out; on the other hand, it leaves room for the second locking ring 641 to move, so that the second locking ring 641 can press the first locking ring 632 in place.

[0022] Preferably, the injection nozzle 21 includes a conical pressurizing chamber 211 and a first cylindrical cavity 212 located at the bottom of the conical pressurizing chamber 211. The diameter of the first cylindrical cavity 212 is larger than the diameter of the bottom surface of the conical pressurizing chamber 211, which can hold more liquid and supply it to the conical pressurizing chamber 211 for pressurized spraying, thus avoiding a short-term decrease in liquid volume during spraying and affecting the uniformity of spraying.

[0023] In one embodiment, a guide post 44 is provided at the center of the front of the unidirectional flow divider 4, and the injection head 2 is provided with a guide groove 22 that matches the guide post 44; a first spring 45 is provided between the first cylindrical cavity 212 and the unidirectional flow divider 4.

[0024] It should be noted that the guide post 44 is used for the axial positioning of the one-way flow divider 4. By cooperating with the guide groove 22, it ensures that the axial center of the one-way flow divider 4 is located at the predetermined position of the injection head 2.

[0025] To ensure that the flow rates of each injection nozzle 21 are approximately the same, a flow-limiting disk 43 is provided on the front of the one-way diverting disk 4, corresponding to the first cylindrical cavity 212. A flow-limiting column 46 is provided on the flow-limiting disk 43, extending into the first cylindrical cavity 212. The first spring 45 is located in the first cylindrical cavity 212 and abuts against the flow-limiting disk 43. During injection, the liquid-driven plug 14 moves towards the injection head 2, pushing the liquid in the main liquid cavity 12 into the outlet cavity 13. During this process, the one-way diverting disk 4 is also pushed by the liquid, moving towards the injection nozzle 21. The liquid in the outlet cavity 13 is diverted through the confluence cavity 41 of the one-way diverting disk 4, roughly dividing into four streams flowing towards the corresponding injection nozzle 21. However, due to variations in diameter and other parameters of the injection nozzles 21 at different positions, the final injection speed of the liquid flowing towards the injection nozzle 21 at the same pressure in the confluence cavity 41 may differ. The injection nozzle 21 of this application is provided with a conical pressurizing chamber 211 and a first cylindrical cavity 212 located at the bottom of the conical pressurizing chamber 211. During the movement of the one-way diverting disk 4, the diameter of the flow-limiting disk 43 is larger than the diameter of the first cylindrical cavity 212. When it approaches the opening of the first cylindrical cavity 212, it can restrict the flow of liquid in the first cylindrical cavity 212 to the confluence cavity 41. The flow-limiting column 46 extends into the first cylindrical cavity 212, occupies the space of the first cylindrical cavity 212, and forms a thrust locally to force the liquid in the first cylindrical cavity 212 out of the injection nozzle 21. The one-way diverting disk 4 is positioned by the guide column 44, which can ensure that the flow-limiting column 46 in the first cylindrical cavity 212 moves synchronously, thereby improving the consistency of the liquid flow rate ejected from the injection nozzle 21.

[0026] The first sealing structure 5 is a rubber plug 51 located on the back of the one-way diverter 4. The rubber plug 51 has a conical tip 511, which is used to close the connecting hole 111.

[0027] The flow-limiting disk 43 extends to the back of the unidirectional flow-dividing disk 4, thereby forming the confluence cavity 41 on the side of the unidirectional flow-dividing disk 4. The flow-limiting disks 43 are evenly arranged circumferentially and connected to the central column 48 located at the axis through ribs 47. The ribs 47 cooperate with the flow-limiting disks 43 to divide different chamber spaces for supplying liquid to the injection nozzle 21, avoiding inconsistent injection speeds of the injection nozzle 21 due to different resistances of different injection nozzles when supplying liquid through a mixing chamber.

[0028] The working principle of this embodiment is explained in detail below: Liquid extraction: The power source drives the liquid driving plug 14 to move backward, and the one-way diverting plate 4 seals 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. The medicine bottle is mounted on the medicine bottle mounting seat 31, and the liquid in the medicine bottle enters the main liquid chamber 12.

[0029] Injection: The power source drives the liquid-driven plug 14 to move forward. Under the positive pressure of the main liquid chamber 12, the ball 61 of the liquid supply mechanism 3 abuts against the concave arc surface 631 of the arc seat 63 to prevent the liquid from flowing back into the medicine bottle and contaminating it. The one-way diverting plate 4 moves towards the injection nozzle 21 under the push of the liquid in the main liquid chamber 12. The rubber stopper 51 separates from the connecting hole 111, and the connecting hole 111 passes the liquid in the main liquid chamber 12 into the outlet chamber 13. The liquid in the outlet chamber 13 is ejected outward through the confluence chamber 41, the first cylindrical cavity 212, and the conical pressurization chamber 211. When the liquid enters the first cylindrical cavity 212, the flow-limiting column 46 and the flow-limiting disk 43 cooperate to simultaneously reduce the volume of the first cylindrical cavity 212, so that the liquid from different injection nozzles 21 is ejected at approximately the same speed.

[0030] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A multi-head needleless injector with uniform firing rate, characterized in that, The syringe 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 equipped with a liquid driving plug, and the liquid outlet chamber is equipped with a one-way flow divider. The partition plate is provided with a connecting hole, and the back of the one-way diverter is provided with a first sealing structure that can close 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. The liquid supply mechanism is provided with a second sealing structure, which allows liquid to flow into the main liquid chamber from the medicine bottle mounting seat in one direction. The unidirectional flow divider is provided with a guide post on its front side, and the injection head is provided with a guide groove that matches the guide post. The second sealing structure includes a ball, a second spring, and an arc-shaped seat, wherein the ball is disposed on the arc-shaped seat; The arc-shaped seat has a first snap-fit ​​ring and a quick-connect part. The arc-shaped seat is also provided with a spinning part, which has a second snap-fit ​​ring that cooperates with the first snap-fit ​​ring.

2. The multiple head needle-less injector of uniform velocity of claim 1, wherein, The quick-connect part has a clearance groove, and the second snap ring is located in the clearance groove.

3. The multiple head needle-less injector of uniform velocity of claim 2, wherein, The arc-shaped seat has a concave arc surface at one end facing the main liquid cavity, the liquid supply mechanism has a liquid supply cavity, the ball is disposed in the liquid supply cavity and located in the concave arc surface, and the second spring is provided between the ball and the liquid supply cavity.

4. The multiple head needle-less injector of uniform velocity of claim 1, wherein, The injection head is provided with an injection nozzle, which includes a conical pressure chamber and a first cylindrical cavity located at the bottom of the conical pressure chamber.

5. The multi-head needleless injector with uniform injection rate as described in claim 4, characterized in that, A first spring is provided between the first cylindrical cavity and the unidirectional flow divider.

6. The multiple head needle-less injector of uniform velocity of claim 5, wherein, The unidirectional flow divider is provided with a flow-limiting disk on the front corresponding to the first cylindrical cavity. The flow-limiting disk is provided with a flow-limiting post, which extends into the first cylindrical cavity. The first spring is provided in the first cylindrical cavity and abuts against the flow-limiting disk.

7. The multiple head needle-less injector of uniform velocity of claim 1, wherein, The first sealing structure is a rubber plug located on the back of the one-way diverter plate. The rubber plug has a conical tip, which is used to close the connecting hole.

8. The multiple head needle-less injector of uniform velocity of claim 6, wherein, The flow-limiting disk extends to the back of the unidirectional flow-dividing disk, thereby forming a confluence cavity on the side of the unidirectional flow-dividing disk.

9. The multiple head needle-less injector of uniform velocity of claim 6, wherein, The flow-limiting disks are evenly arranged circumferentially and connected to the central column located at the axis through ribs.

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