Needleless injector and injection head thereof

Abstract

The injection head of the needleless injector comprises an injection body with a medicine discharging opening in the front end, and further comprises a switching part and a fixing part, the rear end of the switching part is installed on the injection body, an inner cavity of the switching part is in butt joint with the medicine discharging opening, the fixing part is installed on the front portion of the switching part, and a plurality of nozzles are installed on the fixing part. And each nozzle is communicated with the inner cavity of the switching part through the fixing part. Meanwhile, a plurality of nozzles are arranged, so that when the needleless injector is used for injecting a large dose of liquid medicine, the plurality of nozzles can uniformly spread the medicine outlet amount of each injection point, the medicine amount of only the injection part of an injected object is lower than the bearing capacity of the injected object, and the injection object can absorb the medicine easily. In conclusion, the injection head of the needleless injector can effectively solve the problem that the single injection amount of the needleless injector is not large. The utility model further discloses a needleless injector comprising the injection head.

Description

Technical Field

[0001] The utility model relates to the technical field of drug liquid injection, and more specifically, to an injection head of a needle-free syringe, and also to a needle-free syringe comprising the injection head. Background Art

[0002] Needle-free injection is a new injection technology that achieves the purpose of drug injection without needle puncture. It has the advantages of reducing the pain and fear of drug injection, reducing the risk of bacterial infection, avoiding accidents such as needle scratches and breakage, fast drug absorption, no subcutaneous nodules after long-term use, and high injection efficiency. However, in the process of injecting drug solution into pigs, it was found that the drug solution carrying capacity of the injection site of pigs is limited, which is not suitable for large-dose single-point injection.

[0003] In summary, how to effectively solve the problem of small single injection volume of needle-free syringes is an urgent problem that technicians in this field need to solve. Utility Model Content

[0004] In view of this, the first object of the utility model is to provide an injection head for a needle-free syringe, which can effectively solve the problem of small single injection volume of the needle-free syringe. The second object of the utility model is to provide a needle-free syringe including the above-mentioned injection head.

[0005] In order to achieve the above first purpose, the utility model provides the following technical solutions:

[0006] An injection head for a needle-free syringe comprises an injection body having a drug discharge port at the front end, and also comprises an adapter and a fixing portion, wherein the rear end of the adapter is mounted on the injection body and an inner cavity is docked with the drug discharge port, and the fixing portion is mounted on the front portion of the adapter, wherein a plurality of nozzles are mounted on the fixing portion, and each of the nozzles is connected to the inner cavity of the adapter via the fixing portion.

[0007] In the injection head of the needle-free syringe, an adapter is added to the front end of the injection body, and a plurality of nozzles are arranged through the fixing part, so that the liquid medicine discharged from the medicine discharge port of the injection body can be respectively introduced into each nozzle through the adapter. At this time, it is only necessary to discharge the liquid medicine of the injection body from the medicine discharge port into the inner cavity of the adapter, so that each nozzle can complete the injection. Because a plurality of nozzles are arranged at the same time, when the needle-free syringe injects a large dose of liquid medicine, the plurality of nozzles can evenly distribute the amount of medicine discharged from each injection point, so that the amount of medicine at the injection site of the injected object is lower than its carrying capacity, which is beneficial to the absorption of the medicine by the injected object. In summary, the injection head of the needle-free syringe can effectively solve the problem of small single injection volume of the needle-free syringe.

[0008] In some technical solutions, the inner cavity of the adapter portion is a conical cavity with a cross-section that gradually increases in the forward direction, and the small-diameter end of the conical cavity is connected to the medicine discharge port.

[0009] In some technical schemes, the injection body includes a syringe having a medicine cavity and an injection push rod disposed in the medicine cavity; the injection push rod is slidably matched with the medicine cavity to push the medicine in the medicine cavity to be discharged from the medicine discharge port; the rear end of the adapter is sleeved on the front end of the syringe and the two are threadedly connected.

[0010] In some technical solutions, the small diameter end of the conical cavity is aligned with the drug discharge port and has the same diameter.

[0011] In some technical solutions, the diameter of the medicine cavity is equal to the diameter of the medicine discharge port, so that the injection push rod can extend from the medicine discharge port into the inner cavity of the adapter.

[0012] In some technical solutions, the front portion of the adapter portion has a mounting hole connected to the tapered cavity, and the rear portion of the fixing portion is inserted into the mounting hole and fixedly connected therebetween.

[0013] In some technical solutions, a protrusion extending backwards is provided in the middle of one side of the fixing portion facing the conical cavity, and a plurality of liquid guide channels on the fixing portion for connecting with the nozzle are arranged around the protrusion.

[0014] In some technical solutions, a one-way valve is provided between each of the liquid guiding channels and the nozzle.

[0015] In some technical schemes, the fixing part includes a disc part and a plurality of mounting cylinders, the disc part cooperates with the mounting hole; the disc part has the liquid conducting channel which passes through from front to back, the cylinder cavity of the mounting cylinder is connected to the liquid conducting channel to communicate, the one-way valve is arranged in the cylinder cavity of the mounting cylinder, and the nozzle is sleeved on the mounting cylinder and threadedly matched therebetween.

[0016] In order to achieve the second objective, the utility model also provides a needle-free syringe, which includes any of the above-mentioned injection heads, and also includes a driving device, wherein the driving device is connected to the injection body of the injection head to drive the liquid medicine to complete the injection. Since the above-mentioned injection head has the above-mentioned technical effects, the needle-free syringe having the injection head should also have the corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic cross-sectional structure diagram of an injection head of a needle-free syringe provided in an embodiment of the utility model;

[0019] Figure 2 A schematic cross-sectional view of a needle-free syringe provided in an embodiment of the utility model;

[0020] Figure 3 A schematic diagram of the structure of the adapter provided by the embodiment of the utility model;

[0021] Figure 4 A schematic structural diagram of a fixing portion provided in an embodiment of the utility model.

[0022] The following are marked in the accompanying drawings:

[0023] Injection barrel 1, injection push rod 2, medicine discharge port 3, adapter 4, fixing part 5, nozzle 6, one-way valve 7, pushing device 8;

[0024] Conical cavity 41 , mounting hole 42 , protrusion 51 , disc portion 52 , mounting tube 53 , and liquid guiding channel 54 . DETAILED DESCRIPTION

[0025] The embodiment of the utility model discloses an injection head of a needle-free syringe, which effectively solves the problem that the single injection volume of the needle-free syringe is not large.

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-Figure 4 , Figure 1 A schematic cross-sectional structure diagram of an injection head of a needle-free syringe provided in an embodiment of the utility model; Figure 2 A schematic cross-sectional view of a needle-free syringe provided in an embodiment of the utility model; Figure 3 A schematic diagram of the structure of the adapter provided by the embodiment of the utility model; Figure 4 A schematic structural diagram of a fixing portion provided in an embodiment of the utility model.

[0028] In some embodiments, an injection head of a needle-free syringe is provided, which is provided with multiple nozzles 6. When the needle-free syringe is used to inject a large dose of liquid medicine, the multiple nozzles 6 can evenly distribute the amount of medicine output at each injection point, so that the amount of medicine at the injection site of the pig is lower than its carrying capacity, which is beneficial to the pig's absorption of the medicine.

[0029] In some embodiments, an injection head of a needle-free syringe is provided, comprising an injection body, an adapter portion 4 and a fixing portion 5 , and a plurality of nozzles 6 are also provided.

[0030] The front end of the injection body has a drug discharge port 3, and a power component is arranged inside to discharge the drug liquid from the drug discharge port, generally through the injection push rod 2, to push the drug liquid out, and it can also be a hydraulic pressure device, such as a pump body, etc. It should be noted that, in order to facilitate the description of various structural relationships, the spraying direction of the nozzle 6 in the context is the forward direction.

[0031] The rear end of the adapter part 4 is installed on the injection body, and the inner cavity of the adapter part 4 is connected to the drug discharge port 3 to receive the liquid medicine discharged from the drug discharge port 3. The fixed part 5 is installed on the front part of the adapter part 4, and a plurality of nozzles 6 are installed on the fixed part 5, and each nozzle 6 is connected to the inner cavity of the adapter part 4 through the fixed part 5, so that the liquid medicine can be obtained from the above adapter part 4, so that the injection can be completed. It should be noted that the connection method between each nozzle 6 and the fixed part 5 can be set separately according to needs, or the same connection method can be adopted.

[0032] In the injection head of the above-mentioned needle-free syringe, an adapter part 4 is added to the front end of the injection body, and a plurality of nozzles 6 are arranged through the fixing part 5, so that the liquid medicine discharged from the drug discharge port 3 of the injection body can be respectively introduced into each nozzle 6 through the adapter part 4. At this time, it is only necessary to discharge the liquid medicine of the injection body from the drug discharge port 3 into the inner cavity of the adapter part 4, so that each nozzle 6 can complete the injection. Because a plurality of nozzles 6 are arranged at the same time, when the needle-free syringe injects a large dose of liquid medicine, the plurality of nozzles 6 can evenly distribute the amount of medicine discharged from each injection point, so that the amount of medicine at the injection site of the injected object is lower than its carrying capacity, which is beneficial to the absorption of the medicine by the injected object. In summary, the injection head of the needle-free syringe can effectively solve the problem of small single injection volume of the needle-free syringe.

[0033] In some embodiments, considering the need to arrange multiple nozzles 6, the dispersion area required for the multiple nozzles 6 is generally significantly larger than the discharge port 3. In order to facilitate the passage through the adapter 4, the liquid medicine discharged from the discharge port 3 is directed to each nozzle 6, and it is preferred that the inner cavity of the adapter 4 is a conical cavity, and the conical cavity 41 gradually increases in cross section in the forward direction, and the small diameter end of the conical cavity 41 is connected to the discharge port 3, so that the liquid medicine in the discharge port 3 enters the conical cavity 41, and is directed to each nozzle 6 under the guidance of the cavity wall of the conical cavity 41.

[0034] Of course, the inner cavity of the above-mentioned adapter 4 can also be a cylindrical cavity, a square cavity or a special-shaped cavity, and the front and rear cross-sectional sizes are the same or vary little. Compared with the above-mentioned conical cavity 41, these cavities have poorer guiding effects.

[0035] In some embodiments, generally speaking, the injection body includes a syringe barrel 1 having a medicine cavity and an injection push rod 2 disposed in the medicine cavity, and the injection push rod 2 is slidably matched with the medicine cavity so as to be used to push the medicine liquid in the medicine cavity to be discharged from the medicine discharge port 3, that is, by moving the injection push rod 2 forward, the medicine liquid in the medicine cavity can be pushed out from the medicine discharge port 3 to complete the injection.

[0036] At this time, in order to facilitate the connection, it is preferred that the rear end of the adapter 4 is sleeved on the front end of the syringe 1 and the two are threadedly connected. That is, the outer side of the front end of the syringe 1 is provided with an external thread, and the rear end of the adapter 4 is provided with a threaded hole to be connected with the above-mentioned external thread. Generally speaking, in order to ensure a sealed connection, it is generally necessary to connect the rear end of the adapter 4 and the front end of the syringe 1 through a sealing ring to complete the sealed connection. By threading the adapter 4 and the syringe 1, it is convenient to manufacture, and the changes to the shape and structure of the existing syringe 1 can be minimized.

[0037] Of course, the connection between the adapter 4 and the syringe 1 may be by integral molding, clamping, welding, etc., in addition to the above-mentioned threaded connection.

[0038] In some embodiments, the small diameter end of the conical cavity 41 is aligned with the discharge port 3 and has the same diameter to achieve a better guiding effect. The alignment means that the axes of the two are located on the same straight line. In the axial position, the small diameter end of the conical cavity 41 is adjacent to the discharge port 3, that is, connected. It should be noted that if the discharge port 3 is trumpet-shaped, then the small diameter end of the conical cavity 41 is aligned with the discharge port 3 and has the same diameter, which means that the small diameter end of the conical cavity 41 is aligned with the front end of the discharge port 3 and has the same diameter.

[0039] In some embodiments, the diameter of the medicine cavity can be made equal to the diameter of the medicine discharge port 3, so that the injection push rod 2 can extend from the medicine discharge port 3 to the medicine cavity of the adapter 4, so as to fully push the medicine liquid in the medicine cavity into the inner cavity of the adapter 4, so as to effectively avoid residual medicine liquid.

[0040] In some embodiments, the adapter 4 and the fixing portion 5 may be fixedly connected or integrally formed. In order to facilitate molding, a detachable connection is generally adopted. Specifically, in order to facilitate connection, it is preferred that the front portion of the adapter 4 has a mounting hole 42 connected to the conical cavity 41, and the rear portion of the fixing portion 5 is inserted into the mounting hole 42 and fixedly connected therebetween. At this time, the inner side surface of the fixing portion 5 faces the inner cavity of the adapter 4 to facilitate the introduction of the liquid medicine into the nozzle 6.

[0041] In some embodiments, in order to further facilitate the internal liquid medicine diversion, it is preferred that the fixing portion 5 has a protrusion 51 extending backward in the middle of the side facing the conical cavity 41, and a plurality of liquid guide channels 54 for connecting the nozzle 6 on the fixing portion 5 are arranged around the protrusion 51, and the discharge port 3 is opposite to the protrusion 51, so that the protrusion 51 can divert the liquid medicine to guide the liquid guide channels 54 on the side respectively, so as to guide the corresponding nozzle 6 by the corresponding liquid guide channels 54. The liquid guide channels 54 and the nozzles 6 are generally arranged in a one-to-one correspondence. The protrusion 51 can be a cylindrical protrusion or a conical protrusion, and the tip of the conical protrusion is backward to achieve better diversion. Specifically, the protrusion 51 structure can also be arranged accordingly as needed.

[0042] In some embodiments, a one-way valve 7 is generally provided to prevent liquid backflow. When multiple nozzles 6 are provided, only one one-way valve 7 may be provided, such as providing a one-way valve 7 at the drug discharge port 3. However, this arrangement is not good and may cause contamination in the inner cavity of the nozzle 6. Based on this, it is preferred that a one-way valve 7 is provided between each liquid guide channel 54 and the nozzle 6.

[0043] In some embodiments, in order to facilitate the installation of the fixing part 5, the fixing part 5 may include a disc 52 and a plurality of mounting tubes 53. The disc 52 cooperates with the mounting hole 42, such as being connected to the bottom of the rear end of the mounting hole 42 by screws, and preferably sealed by a sealing ring.

[0044] The disc portion 52 has a liquid-conducting channel 54 that runs through the front and back, and the protrusion 51 is provided in the middle of the rear side of the disc portion 52 for flow diversion. Two, three or four liquid-conducting channels 54 are provided around the protrusion 51, and of course more liquid-conducting channels 54 can be provided to correspond to more nozzles 6. The barrel cavity of the mounting barrel 53 is connected to the liquid-conducting channel 54 for communication, and the one-way valve 7 is provided in the barrel cavity of the mounting barrel 53, and the nozzle 6 is sleeved on the mounting barrel 53 and threadedly matched therebetween. In the fixing portion 5, the connection between the nozzle 6 and the adapter 4 is simple in connection method and easy to operate.

[0045] In some embodiments, an injection head of a needle-free syringe is provided, which mainly includes a transfer part 4, a fixing part 5, a nozzle 6 and a one-way valve 7. One end of the transfer part 4 is connected to the syringe body, and the other end is connected to the fixing part 5. A sealing ring is arranged between the transfer part 4 and the fixing part 5. A plurality of nozzles 6 are arranged on the fixing part 5. A one-way valve 7 is arranged between each nozzle 6 and the fixing part 5. The liquid medicine is uniformly ejected through each nozzle 6 through the cavity.

[0046] A conical groove is provided at one end of the adapter portion 4 , and a groove for placing a sealing ring is also provided at the outer edge of the conical groove, and a cavity is formed between the conical groove and the fixing portion 5 .

[0047] A boss is provided at the center of the fixing portion 5 on one side of the cavity, which can divert the injected liquid medicine and effectively reduce the impact on the fixing portion 5 of the nozzle 6 .

[0048] A plurality of bosses connected to the nozzle 6 are arranged on the other side of the nozzle 6 fixing portion 5 , a groove for placing the one-way valve 7 of the nozzle 6 is arranged on the boss, and a sealing ring is also arranged between the boss and the nozzle 6 .

[0049] Based on the injection head of the needle-free syringe provided in the above embodiment, the utility model also provides a needle-free syringe, which includes any one of the injection heads in the above embodiment, and also includes a pushing device 8, the pushing device 8 is connected to the injection body of the injection head to drive the liquid medicine to complete the injection, and the specific pushing device 8 pushes the injection push rod 2, or drives the liquid pump to rotate. Since the needle-free syringe adopts the injection head in the above embodiment, please refer to the above embodiment for the beneficial effects of the needle-free syringe.

[0050] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0051] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An injection head of a needle-free syringe, comprising an injection body with a drug discharge port at the front end, characterized in that: It also includes an adapter part and a fixing part. The rear end of the adapter part is installed on the injection body and the inner cavity is connected to the medicine discharge port. The fixing part is installed on the front part of the adapter part. The fixing part is installed with multiple nozzles, and each of the nozzles is connected to the inner cavity of the adapter part through the fixing part.

2. The injection head of the needle-free syringe according to claim 1, characterized in that: The inner cavity of the transition part is a tapered cavity with a cross section gradually increasing in the forward direction, and the small diameter end of the tapered cavity is connected to the medicine discharge port.

3. The injection head of the needle-free syringe according to claim 2, characterized in that: The injection body includes an injection barrel having a medicine cavity and an injection push rod arranged in the medicine cavity; the injection push rod is slidably matched with the medicine cavity to push the medicine liquid in the medicine cavity to be discharged from the medicine discharge port; the rear end of the adapter is sleeved on the front end of the injection barrel and the two are threadedly connected.

4. The injection head of the needle-free syringe according to claim 3, characterized in that: The small diameter end of the tapered cavity is aligned with the medicine discharge port and has the same diameter.

5. The injection head of the needle-free syringe according to claim 4, characterized in that: The diameter of the medicine cavity is equal to the diameter of the medicine discharge port, so that the injection push rod can extend from the medicine discharge port into the inner cavity of the adapter.

6. The injection head of the needle-free syringe according to any one of claims 2 to 5, characterized in that: The front part of the adapter portion has a mounting hole connected to the tapered cavity, and the rear part of the fixing portion is inserted into the mounting hole and fixedly connected therebetween.

7. The injection head of the needle-free syringe according to claim 6, characterized in that: A protrusion extending backwards is provided in the middle of one side of the fixing portion facing the conical cavity, and a plurality of liquid guide channels on the fixing portion for connecting with the nozzle are arranged around the protrusion.

8. The injection head of the needle-free syringe according to claim 7, characterized in that: A one-way valve is arranged between each of the liquid guiding channels and the nozzle.

9. The injection head of the needle-free syringe according to claim 8, characterized in that: The fixing portion includes a disc portion and a plurality of mounting tubes, the disc portion is arranged in cooperation with the mounting hole; the disc portion has the liquid conducting channel which passes through from front to back, the barrel cavity of the mounting tube is connected to the liquid conducting channel to communicate, the one-way valve is arranged in the barrel cavity of the mounting tube, and the nozzle is sleeved on the mounting tube and threadedly matched therebetween.

10. A needle-free syringe, further comprising a pushing device, characterized in that: It also includes the injection head as described in any one of claims 1 to 9, wherein the pushing device is connected to the injection body of the injection head to drive the drug solution to complete the injection.

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