Needle assembly and microneedle therapeutic device

Abstract

The utility model relates to the field of medical devices, and specifically to a needle assembly and a microneedle therapeutic instrument, comprising a shell, a driving assembly and a needle device, the driving assembly comprising a driving motor and a sliding rod, the driving motor is used to drive the sliding rod to reciprocate along the length direction of the shell, the needle assembly also includes a first drug storage part, the first drug storage part is used to contain a medicinal solution, the shell is provided with a first liquid inlet channel, the first liquid inlet channel is connected to the first drug storage part, absorbent cotton is arranged at the bottom of the shell, the absorbent cotton blocks the bottom of the shell, the medicinal solution in the first drug storage part flows along the inner wall of the shell through the first liquid inlet channel to the absorbent cotton, which can solve the defects that it takes a certain amount of time for the medicinal solution to flow into the subcutaneous tissue along the hole punctured by the microneedle during the current microneedle treatment, and part of the medicinal solution may be contaminated by being exposed to the air for a long time.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, and in particular to a needle assembly and a micro-needle therapeutic instrument. Background Art

[0002] Microneedle therapy devices are usually used in microneedle therapy, which uses tiny needle-like instruments to make minimally invasive injuries to the skin, and then applies drugs to the skin surface. The microneedles are used to increase the drug absorption rate in the subcutaneous tissue, thereby enhancing the medical effect.

[0003] At present, the treatment steps of microneedle therapy devices are usually divided into two types: one: the first step is skin cleaning and disinfection, anesthetic and anesthetic cleaning, the second step is to apply liquid medicine, the third step is microneedle puncture, and the fourth step is to spray repair spray to repair the skin; the second step is the first step, skin cleaning and disinfection, anesthetic and anesthetic cleaning, the second step is microneedle puncture, the third step is to apply liquid medicine, and the fourth step is to spray repair spray to repair the skin. Both treatment methods are to apply liquid medicine to the skin, and both treatment methods are to separate the steps of applying liquid medicine and microneedle puncture. The difference is that the order of microneedle puncture and applying liquid medicine is different. The liquid medicine flows into the subcutaneous tissue along the hole of microneedle puncture. The hole of microneedle puncture is small, and it takes a certain amount of time for the liquid medicine to flow into the subcutaneous tissue along the hole of microneedle puncture. Some liquid medicine may be contaminated if exposed to the air for a long time.

[0004] Therefore, based on the above-mentioned deficiencies, there is an urgent need to design a needle assembly and a microneedle therapeutic device to solve the defects that in the current microneedle treatment process, it takes a certain amount of time for the drug solution to flow into the subcutaneous tissue along the microneedle puncture holes, and some of the drug solution may be contaminated due to long-term exposure to the air. Utility Model Content

[0005] The purpose of the utility model is to provide a needle assembly and a microneedle therapy device to provide a relatively closed environment for the drug liquid during microneedle therapy, thereby reducing the risk of the drug liquid being exposed to the air, in order to address the defects that in the current microneedle therapy process, it takes a certain amount of time for the drug liquid to flow into the subcutaneous tissue along the holes punctured by the microneedles, and some of the drug liquid may be contaminated due to long-term exposure to the air.

[0006] In order to achieve the above-mentioned utility model purpose, the utility model provides the following technical solutions:

[0007] A needle assembly comprises a housing, a driving assembly and a needle device, wherein the driving assembly is arranged in the housing, the needle device is connected to the driving assembly, the driving assembly comprises a driving motor and a sliding rod, the driving motor is used to drive the sliding rod to reciprocate along the length direction of the housing, the needle assembly further comprises a first medicine storage part, the first medicine storage part is used to contain a medicine liquid, the housing is provided with a first liquid inlet channel, the first liquid inlet channel is connected with the first medicine storage part, absorbent cotton is arranged at the bottom of the housing, the absorbent cotton blocks the bottom of the housing, and the medicine liquid in the first medicine storage part flows along the inner wall of the housing through the first liquid inlet channel to the absorbent cotton;

[0008] The housing is provided with a limiting groove, and the limiting groove is used to limit the needle device;

[0009] The sliding rod is provided with a first baffle and a second baffle, the second medicine storage part is a barrel-shaped structure, a limiting block is provided on the inner wall of the second medicine storage part, the limiting block is located between the first baffle and the second baffle, and is used to limit the first baffle and the second baffle, the first baffle is located above the limiting block, the first baffle and the limiting block are connected by a spring, the second medicine storage part has a through hole for the needle to pass through, the needle is connected to the second baffle, the second baffle is provided with a liquid outlet, the liquid outlet is connected to the liquid outlet channel, and in the initial state, there is a spacing d between the second baffle and the bottom of the second medicine storage part, d≠0;

[0010] The driving assembly drives the needle device to reciprocate along the length direction of the shell. When the needle device abuts against the bottom of the limiting groove, the driving motor continues to drive the sliding rod to move along the length direction of the shell, and the second baffle gradually sinks into the liquid in the second drug storage part, and the liquid in the second drug storage part flows out along the liquid outlet hole and the liquid outlet channel;

[0011] After the treatment is completed, the drive assembly drives the needle device to reciprocate along the length direction of the shell, and the spring releases elastic potential energy, so that the distance between the second baffle and the bottom of the second medicine storage part gradually increases, and the second baffle gradually withdraws from the medicine liquid in the second medicine storage part to make the needle withdraw from the treatment site.

[0012] As a preferred technical solution of the present application, the housing is provided with a blocking block, the blocking block is used to block or open the first liquid inlet channel, the blocking block is provided with a second liquid inlet channel, and the first liquid inlet channel is opened or closed by aligning or misaligning the second liquid inlet channel with the first liquid inlet channel;

[0013] When the needle assembly is not opened, the second liquid inlet channel is offset from the first liquid inlet channel so that the first liquid inlet channel is closed;

[0014] When the needle assembly is opened, the drive assembly drives the needle device to move along the length direction of the shell, and the needle device gradually pushes the blocking block until the second liquid inlet channel is aligned with the first liquid inlet channel, so that the first liquid inlet channel is opened.

[0015] As a priority technical solution of the present application, the needle device includes a second medicine storage part, the second medicine storage part is provided with a liquid inlet hole, a plurality of needles are provided at the bottom of the second medicine storage part, a liquid outlet channel is provided in the length direction of the needle, and the liquid outlet channel is connected with the second medicine storage part. The needle device is driven to move by a driving component so that the distance between the liquid inlet hole of the second medicine storage part and the liquid inlet channel gradually decreases, and the medicine liquid in the first medicine storage part flows out through the liquid inlet channel, the second medicine storage part and the liquid outlet channel of the needle in turn.

[0016] As the priority technical solution of the present application, the needle device has a first state and a second state. The liquid inlet hole is connected to the first liquid inlet channel in the first state, and the needle device is moved to the bottom of the limit groove in the second state. When the needle device switches from the first state to the second state, the liquid inlet hole is connected to the first liquid inlet channel.

[0017] As a preferred technical solution of the present application, the shell and the blocking block are connected via an elastic member.

[0018] As a preferred technical solution of the present application, the needle device and the drive assembly are detachably connected.

[0019] As a preferred technical solution of the present application, the absorbent cotton is detachably connected to the shell.

[0020] The present application also provides a microneedle therapeutic device, comprising a needle assembly as described above.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1. In the scheme of the present application, during treatment, medicine is added to the first medicine storage part, and the medicine in the first medicine storage part flows from the inner wall of the shell to the absorbent cotton along the first liquid inlet channel, and the absorbent cotton of the needle assembly is used to apply to the part to be treated, and the drive assembly is turned on to perform microneedle puncture on the treatment part. Part of the medicine applied on the skin surface enters the subcutaneous tissue along the hole of the microneedle puncture, thereby reducing the volatilization of the medicine. At the same time, the medicine in the first medicine storage part continues to flow along the first liquid inlet channel to the absorbent cotton, and penetrates from the absorbent cotton to the skin surface. The absorbent cotton provides a relatively closed environment for the medicine, reducing the exposure of the medicine to the air. The absorbent cotton has a buffering effect on the flow of the medicine to the skin, reducing the discomfort caused by excessive amount of medicine flowing to the skin surface, and the interval between application and microneedle puncture is short, thereby reducing the volatilization of part of the medicine caused by body temperature.

[0023] 2. Furthermore, by providing a blocking block, when not in use, the first liquid inlet channel is in a closed state, and the user can fill the first drug storage part with liquid in advance. The driving component includes a propulsion mode and a retraction mode. This structure is a prior art and will not be described in detail here. The propulsion mode of the driving component is turned on, and the driving motor drives the sliding rod to reciprocate along the length direction of the shell, driving the needle device to move, so that the blocking block gradually releases the blockage of the first liquid inlet channel, and the medicine in the first drug storage part flows out through the first liquid inlet channel and flows along the inner wall of the shell to the absorbent cotton. The user can add medicine to the first drug storage part in advance, and turn on the driving component when performing microneedle puncture. The driving component first releases the blockage of the first liquid inlet channel by the blocking block, and the user applies the medicine to the treatment part. After the application, the needle device performs microneedle puncture on the treatment part, and the first liquid inlet channel is continuously opened. The medicine flows out from the inner wall of the shell along the first liquid inlet channel and penetrates into the skin from the absorbent cotton. After the treatment is completed, the retraction mode is turned on to pull out the needle.

[0024] 3. Further, the driving component propulsion mode is turned on to drive the needle device to move, so that the blocking block gradually releases the blocking of the first liquid inlet channel, and the liquid in the first drug storage part flows out through the first liquid inlet channel and flows along the inner wall of the shell to the patient's skin surface. The driving component continues to push the needle device to move, so that the liquid inlet hole of the second drug storage part is connected with the first liquid inlet channel, and the liquid in the first drug storage part flows out through the liquid inlet channel, the second drug storage part and the liquid outlet channel of the needle in turn, so that the liquid medicine flows into the patient's subcutaneous tissue, and the liquid medicine flows out from the liquid outlet channel, thereby reducing the shrinkage and convergence of the microneedle puncture hole caused by the convergence of the skin and subcutaneous tissue after the microneedle is pulled out, so that the subcutaneous tissue has a low absorption rate of the liquid medicine;

[0025] When the first liquid inlet channel is aligned with the liquid inlet hole, the needle device has not moved outside the shell. After the liquid medicine expels the air in the needle, it flows along the liquid outlet channel to the absorbent cotton, reducing the risk of air entering the subcutaneous tissue and causing swelling and pain in the subcutaneous tissue, while reducing the discomfort of the patient caused by the liquid medicine flowing from the liquid outlet channel to the skin surface.

[0026] 4. Furthermore, the limit groove limits the moving position of the needle assembly, reducing the risk of the needle penetrating too deeply and causing discomfort to the patient.

[0027] 5. Further, by providing a first baffle and a second baffle, the needle is connected to the second baffle, a spring is connected between the first baffle and the limit block, when the needle device has not moved to the bottom of the limit groove, the liquid in the second drug storage part is located in the gap between the second baffle and the bottom of the second drug storage part, the driving component continues to push the needle device, compresses the spring, the distance between the second baffle and the bottom of the second drug storage part gradually decreases, the needle device gradually moves to the outside of the shell, the liquid in the second drug storage part flows out from the liquid outlet channel of the needle along the liquid outlet hole of the second baffle, and the gas in the liquid outlet channel of the needle is discharged at the same time, reducing the discomfort caused by excessive liquid outflow before microneedle puncture;

[0028] When the retraction mode is turned on, the second baffle is withdrawn from the medicine in the second medicine storage part, so that the medicine no longer flows out along the liquid outlet channel. The second baffle does not close the second medicine storage part, thereby reducing the reflux of blood and / or medicine when the needle is pulled out. After the needle is pulled out of the treatment site, the second baffle is withdrawn from the medicine in the second medicine storage part, thereby reducing the continuous outflow of medicine from the liquid outlet channel after the needle is pulled out, thereby reducing the discomfort caused to the patient.

[0029] 6. Furthermore, when the needle device moves to the bottom of the limiting groove, the needle penetrates into the patient's subcutaneous tissue, and the liquid inlet hole is continuously connected to the first liquid inlet channel. The drug liquid enters the patient's subcutaneous tissue through the first liquid inlet channel, the second drug storage part liquid inlet hole and the needle's liquid outlet channel in turn, thereby improving the absorption rate of the drug liquid in the subcutaneous tissue.

[0030] 7. Furthermore, the shell and the blocking block are connected by an elastic member, so that after the needle device is retracted into the shell, the elastic member restores its deformation and pushes the blocking block to close the first liquid inlet channel, thereby improving convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of one embodiment of a needle assembly and a microneedle therapeutic device of the present application;

[0032] Figure 2 This is a schematic structural diagram of one embodiment of a needle assembly and a microneedle therapeutic device of the present application;

[0033] Figure 3 This is an enlarged view of the first drug storage portion of a needle assembly and a microneedle therapeutic device of the present application;

[0034] Figure 4 This is an enlarged view of a needle assembly and a needle device of a microneedle therapeutic apparatus of the present application;

[0035] Figure 5 This is a partial structural schematic diagram of a needle assembly and a needle of a microneedle therapeutic device in this application;

[0036] Figure 6 This is a partial structural schematic diagram of a needle assembly and a second baffle of a microneedle therapeutic device of the present application;

[0037] Figure 7 This is an enlarged view of a needle assembly and a blocking block of a microneedle therapeutic device of the present application;

[0038] Markings in the figure: 1-driving assembly, 101-driving motor, 102-sliding rod, 2-housing, 3-needle device, 301-needle, 302-liquid inlet, 4-first drug storage part, 5-second drug storage part, 6-blocking block, 7-elastic member, 8-first liquid inlet channel, 9-liquid outlet channel, 10-first baffle, 11-second baffle, 1101-liquid outlet, 12-limiting block, 13-spring, 14-absorbent cotton. DETAILED DESCRIPTION

[0039] To make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments.

[0040] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the present invention to be protected, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] Embodiment 1: This embodiment provides a needle assembly and a microneedle therapeutic device, see Figure 1-Figure 7 As shown, a needle assembly and a microneedle therapeutic instrument, characterized in that: a needle assembly includes a shell 2, a drive assembly 1 and a needle device 3, the drive assembly 1 is arranged in the shell 2, the needle device 3 is connected to the drive assembly 1, the drive assembly 1 includes a drive motor 101 and a sliding rod 102, the drive motor 101 is used to drive the sliding rod 102 to reciprocate along the length direction of the shell 2, the needle assembly also includes a first drug storage part 4, the first drug storage part 4 is used to contain liquid medicine, the shell 2 is provided with a first liquid inlet channel 8, the first liquid inlet channel 8 is connected to the first drug storage part 4, the bottom of the shell 2 is provided with absorbent cotton 14, the absorbent cotton blocks the bottom of the shell 2, and the liquid medicine in the first drug storage part 4 flows along the inner wall of the shell 2 through the first liquid inlet channel 8 to the absorbent cotton 14;

[0044] During treatment, liquid medicine is added to the first drug storage part 4, and the liquid medicine in the first drug storage part 4 flows from the inner wall of the shell 2 to the absorbent cotton 14 along the first liquid inlet channel 8, and the absorbent cotton 14 of the needle assembly is used to apply to the part to be treated, and the drive assembly 1 is turned on to perform microneedle puncture on the treatment part. Part of the liquid medicine applied on the skin surface enters the subcutaneous tissue along the hole of the microneedle puncture, reducing the volatilization of the liquid medicine. At the same time, the liquid medicine in the first drug storage part 4 continues to flow along the first liquid inlet channel 8 to the absorbent cotton 14, and penetrates into the skin surface from the absorbent cotton 14. The absorbent cotton 14 provides a relatively closed environment for the liquid medicine, reducing the exposure of the liquid medicine to the air. The absorbent cotton 14 has a buffering effect on the flow of the liquid medicine to the skin, reducing the discomfort caused by excessive amount of liquid medicine flowing to the skin surface. The interval between application and microneedle puncture is short, reducing the volatilization of part of the liquid medicine caused by body temperature.

[0045] As a preferred embodiment, on the basis of the above-mentioned manner, further, the housing 2 is provided with a blocking block 6, the blocking block 6 is used to block or open the first liquid inlet channel 8, the blocking block 6 is provided with a second liquid inlet channel, and the first liquid inlet channel 8 is opened or closed by aligning or misaligning the second liquid inlet channel with the first liquid inlet channel 8;

[0046] When the needle assembly is not opened, the second liquid inlet channel is offset from the first liquid inlet channel 8 so that the first liquid inlet channel 8 is closed;

[0047] When the needle assembly is opened, the drive assembly 1 drives the needle device 3 to move along the length direction of the housing 2, and the needle device 3 gradually pushes the blocking block 6 until the second liquid inlet channel is aligned with the first liquid inlet channel 8, so that the first liquid inlet channel 8 is opened;

[0048] By providing a blocking block 6, when not in use, the first liquid inlet channel 8 is in a closed state, and the user can fill the first drug storage part 4 with liquid in advance. The driving component 1 includes a propulsion mode and a retraction mode. This structure is a prior art and will not be described in detail here. The propulsion mode of the driving component 1 is turned on to drive the needle device 3 to move, so that the blocking block 6 gradually releases the blockage of the first liquid inlet channel 8. The medicine in the first drug storage part 4 flows out through the first liquid inlet channel 8 and flows along the inner wall of the shell 2 to the absorbent cotton 14. The user can add medicine to the first drug storage part 4 in advance. When performing microneedle puncture, the driving component 1 is turned on. The driving component 1 first releases the blockage of the first liquid inlet channel 8 by the blocking block 6. The user applies the treatment area. After the application, the needle device 3 performs microneedle puncture on the treatment area. The first liquid inlet channel 8 is continuously opened, and the medicine flows out from the inner wall of the shell 2 along the first liquid inlet channel 8 and penetrates into the skin from the absorbent cotton 14. After the treatment is completed, the retraction mode is turned on to pull out the needle 301.

[0049] As a preferred embodiment, on the basis of the above-mentioned manner, further, the needle device 3 includes a second drug storage part 5, the second drug storage part 5 is provided with a liquid inlet hole 302, a plurality of needles are provided at the bottom of the second drug storage part 5, and a liquid outlet channel 9 is provided in the length direction of the needles, the liquid outlet channel 9 is connected with the second drug storage part 5, and the sliding rod 102 is driven by the driving component 1 to move along the length direction of the shell 2, so that the distance between the liquid inlet hole 302 of the second drug storage part 5 and the liquid inlet channel is gradually reduced, so that the liquid in the first drug storage part 4 flows out through the liquid inlet channel, the second drug storage part 5 and the liquid outlet channel 9 of the needle 301 in sequence;

[0050] The driving component 1 is turned on in the propulsion mode, and the needle device 3 is driven to move, so that the blocking block 6 gradually releases the blocking of the first liquid inlet channel 8, and the liquid in the first drug storage part 4 flows out through the first liquid inlet channel 8, flows along the inner wall of the shell 2 to the patient's skin surface, and the driving component 1 continues to push the needle device 3 to move, so that the liquid inlet hole 302 of the second drug storage part 5 is connected with the first liquid inlet channel 8, and the liquid in the first drug storage part 4 flows out through the liquid inlet channel, the second drug storage part 5 and the liquid outlet channel 9 of the needle in turn, so that the liquid medicine flows into the patient's subcutaneous tissue, and the liquid medicine flows out from the liquid outlet channel 9, so as to reduce the shrinkage and convergence of the hole punctured by the needle 301 due to the convergence of the skin and subcutaneous tissue after the needle 301 is pulled out, so that the absorption rate of the liquid medicine by the subcutaneous tissue is not high;

[0051] When the first liquid inlet channel 8 is aligned with the liquid inlet hole 302, the needle device 3 has not moved outside the shell 2. After the liquid medicine discharges the air in the needle 301, it flows along the liquid outlet channel 9 to the absorbent cotton 14, reducing the risk of air entering the subcutaneous tissue and causing swelling and pain in the subcutaneous tissue, while reducing the discomfort caused by the liquid medicine flowing from the liquid outlet channel 9 to the skin surface.

[0052] Embodiment 2: Based on the technical solution of embodiment 1, further, see Figure 1-Figure 7 As shown, the housing 2 is provided with a limiting groove, and the limiting groove is used to limit the needle device 3;

[0053] The limiting groove limits the moving position of the needle assembly, reducing the risk of the needle 301 penetrating too deeply and causing discomfort to the patient.

[0054] As a preferred embodiment, on the basis of the above-mentioned manner, further, the sliding rod 102 is provided with a first baffle 10 and a second baffle 11, the second medicine storage part 5 is a barrel-shaped structure, and a limiting block 12 is provided on the inner wall of the second medicine storage part 5, and the limiting block 12 is located between the first baffle 10 and the second baffle 11, and is used to limit the first baffle 10 and the second baffle 11, the first baffle 10 is located above the limiting block 12, and the first baffle 10 and the limiting block 12 are connected by a spring 13, the second medicine storage part 5 has a through hole for the needle to pass through, and the needle is connected to the second baffle 11, and the second baffle 11 is provided with a liquid outlet 1101, and the liquid outlet 1101 is connected to the liquid outlet channel 9, and in the initial state, the second baffle 11 is at a certain distance from the bottom of the second medicine storage part 5;

[0055] When using microneedle therapy, the drive assembly 1 drives the needle device 3 to move along the length direction of the housing 2. When the needle device 3 abuts against the bottom of the limiting groove, the drive motor 101 continues to drive the sliding rod 102 to move along the length direction of the housing 2. When the first baffle 10 compresses the spring 13, the distance between the second baffle 11 and the bottom of the second drug storage part 5 gradually decreases, and the second baffle 11 is immersed in the drug liquid in the second drug storage part 5. The drug liquid in the second drug storage part 5 flows out along the liquid outlet hole 1101 and the liquid outlet channel 9;

[0056] After the microneedle treatment is completed, the drive assembly 1 drives the needle device 3 to move along the length direction of the housing 2, and the spring 13 releases the elastic potential energy, so that the distance between the second baffle 11 and the bottom of the second drug storage part 5 gradually increases, and the second baffle 11 gradually withdraws from the drug liquid in the second drug storage part 5, and the distance between the needle device 3 and the bottom of the limiting groove gradually increases, so that the needle withdraws from the treatment site;

[0057] By providing a first baffle 10 and a second baffle 11, the needle is connected to the second baffle 11, and a spring 13 is connected between the first baffle 10 and the limit block 12. When the needle device 3 has not moved to the bottom of the limit groove, the medicine liquid in the second medicine storage part 5 is located in the gap between the second baffle 11 and the bottom of the second medicine storage part 5. The driving component 1 continues to push the needle device 3, compressing the spring 13, and the distance between the second baffle 11 and the bottom of the second medicine storage part 5 gradually decreases. The needle device 3 gradually moves to the outside of the housing 2, and the medicine liquid in the second medicine storage part 5 flows out from the liquid outlet channel 9 of the needle along the liquid outlet hole 1101 of the second baffle 11, and at the same time, the gas in the liquid outlet channel 9 of the needle 301 is discharged, thereby reducing the discomfort caused by excessive liquid outflow before microneedle puncture;

[0058] When the retraction mode is turned on, the second baffle 11 withdraws from the medicine in the second medicine storage part 5, so that the medicine no longer flows out along the liquid outlet channel 9. The second baffle 11 does not close the second medicine storage part 5, thereby reducing the reflux of blood and / or medicine when the needle is pulled out. After the needle is pulled out of the treatment site, the second baffle 11 withdraws from the medicine in the second medicine storage part 5, thereby reducing the continuous outflow of medicine from the liquid outlet channel 9 after the needle is pulled out, thereby reducing the discomfort caused to the patient.

[0059] As a preferred embodiment, on the basis of the above manner, further, the needle device 3 has a first state and a second state, the liquid inlet hole 302 is in communication with the first liquid inlet channel 8 in the first state, the needle device 3 moves to the bottom of the limiting groove in the second state, and when the needle device 3 switches from the first state to the second state, the liquid inlet hole 302 is in communication with the first liquid inlet channel 8;

[0060] When the needle device 3 moves to the bottom of the limiting groove, the needle penetrates into the patient's subcutaneous tissue, and the liquid inlet hole 302 is continuously connected to the first liquid inlet channel 8. The drug liquid enters the patient's subcutaneous tissue through the first liquid inlet channel 8, the liquid inlet hole 302 of the second drug storage part 5 and the liquid outlet channel 9 of the needle 301 in turn, thereby reducing the amount of drug liquid evaporated due to the patient's body temperature and improving the absorption rate of the drug liquid in the subcutaneous tissue.

[0061] As a preferred embodiment, on the basis of the above-mentioned manner, further, the housing 2 and the blocking block 6 are connected via an elastic member 7;

[0062] The housing 2 and the blocking block 6 are connected via the elastic member 7, so that after the needle device 3 is retracted into the housing 2, the elastic member 7 recovers its deformation and pushes the blocking block 6 to close the first liquid inlet channel 8, thereby improving convenience.

[0063] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention are included in the scope of the claims of the present invention.

Claims

1. A needle assembly, characterized in that: It includes a shell, a driving assembly and a needle device, the driving assembly is arranged in the shell, the needle device is connected to the driving assembly, the driving assembly includes a driving motor and a sliding rod, the driving motor is used to drive the sliding rod to reciprocate along the length direction of the shell, the needle assembly also includes a first medicine storage part, the first medicine storage part is used to contain liquid medicine, the shell is provided with a first liquid inlet channel, the first liquid inlet channel is connected to the first medicine storage part, absorbent cotton is arranged at the bottom of the shell, the absorbent cotton blocks the bottom of the shell, the liquid medicine in the first medicine storage part flows along the inner wall of the shell to the absorbent cotton through the first liquid inlet channel, the shell is provided with a limiting groove, and the limiting groove is used to limit the needle device; The needle device comprises a second medicine storage part, the second medicine storage part is provided with a liquid inlet hole, the sliding rod is provided with a first baffle and a second baffle, the second baffle is connected with a needle, the second medicine storage part is a barrel-shaped structure, a limiting block is provided on the inner wall of the second medicine storage part, the limiting block is located between the first baffle and the second baffle, and is used to limit the first baffle and the second baffle, the first baffle is located above the limiting block, the first baffle and the limiting block are connected by a spring, the second medicine storage part has a through hole for the needle to pass through, the second baffle is provided with a liquid outlet hole, the liquid outlet hole is connected with the liquid outlet channel, and in the initial state, there is a spacing d between the second baffle and the bottom of the second medicine storage part, d≠0; The driving assembly drives the needle device to reciprocate along the length direction of the shell. When the needle device abuts against the bottom of the limiting groove, the driving motor continues to drive the sliding rod to move along the length direction of the shell, and the second baffle gradually sinks into the liquid in the second drug storage part, and the liquid in the second drug storage part flows out along the liquid outlet hole and the liquid outlet channel; After the treatment is completed, the drive assembly drives the needle device to reciprocate along the length direction of the shell, and the spring releases elastic potential energy, so that the distance between the second baffle and the bottom of the second medicine storage part gradually increases, and the second baffle gradually withdraws from the medicine liquid in the second medicine storage part to make the needle withdraw from the treatment site.

2. A needle assembly according to claim 1, characterized in that: The housing is provided with a blocking block, the blocking block is used to block or open the first liquid inlet channel, the blocking block is provided with a second liquid inlet channel, and the first liquid inlet channel is opened or closed by aligning or misaligning the second liquid inlet channel with the first liquid inlet channel; When the needle assembly is not opened, the second liquid inlet channel is offset from the first liquid inlet channel so that the first liquid inlet channel is closed; When the needle assembly is opened, the drive assembly drives the needle device to move along the length direction of the shell, and the needle device gradually pushes the blocking block until the second liquid inlet channel is aligned with the first liquid inlet channel, so that the first liquid inlet channel is opened.

3. A needle assembly according to claim 2, characterized in that: The needle device has a first state and a second state. The liquid inlet hole is connected to the first liquid inlet channel in the first state, and the needle device is moved to the bottom of the limiting groove in the second state. When the needle device switches from the first state to the second state, the liquid inlet hole is connected to the first liquid inlet channel.

4. A needle assembly according to claim 3, characterized in that: The shell and the blocking block are connected via an elastic member.

5. A needle assembly according to claim 4, characterized in that: The needle device is detachably connected to the drive assembly.

6. A needle assembly according to claim 5, characterized in that: The absorbent cotton is detachably connected to the shell.

7. A microneedle therapeutic apparatus, characterized in that: A needle assembly comprising any one of claims 1-6.

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