A metered dose dispensing applicator

Abstract

This application provides a quantitative dispensing device for external application, including a drug storage component, a quantitative transmission component, and a dispensing mechanism. The dispensing mechanism includes a connecting cylinder and a one-way valve body inside it. A rotating component is detachably installed at the bottom of the connecting cylinder. The rotating component includes a connecting cover, and a rotating seat is rotatably provided at its bottom. The rotating seat has several leakage holes inside. Rotating the rotating seat changes the positional relationship between the leakage holes and the one-way valve body, realizing multi-channel switching. This relates to the field of medical auxiliary device technology. The one-way valve prevents backflow and contamination of the drug solution, the quantitative transmission component enables precise drug delivery, and the multi-channel switching of the rotating component adapts to various drug solutions. Most of the components are detachable, facilitating disassembly, cleaning, and disinfection. It also has a grip plate and a start button, making it convenient for patients to operate with one hand. It is particularly suitable for patients with limited postoperative mobility, solving the problems of inconvenient operation, easy contamination, and difficulty in quantitative dispensing in the prior art.

Description

Technical Field

[0001] This invention relates to the field of medical auxiliary device technology, and in particular to a quantitative drug dispensing and external application device. Background Technology

[0002] In hepatobiliary and pancreatic surgery, postoperative or conservative treatment patients often require the application of topical medications (such as analgesics and anti-swelling agents, traditional Chinese medicine ointments, etc.) to wounds and around drainage tubes to promote healing and relieve symptoms. Currently, common application methods mainly rely on cotton swabs, syringe injection, or direct application by hand, but these methods have the following drawbacks: Risk of drug backflow and contamination: When traditional tools (such as cotton swabs and ordinary syringes) come into contact with the wound, residual drugs or wound exudate can easily flow back into the drug container, causing contamination of the entire bottle of drugs and increasing the risk of infection. Inconvenient to operate: Postoperative patients often carry infusion lines and have limited limb movement. Existing tools require both hands to complete the operation of picking up and applying medicine, which is difficult to do independently and requires the assistance of others, thus reducing the convenience of use; Insufficient quantitative precision: When manually dipping or injecting, the amount of medicine is entirely controlled by experience. Too much medicine can easily lead to waste and may irritate the skin, while too little medicine cannot guarantee the therapeutic effect and is difficult to meet the needs of precise treatment. Poor maintainability: Most existing application heads have a fixed structure, making cleaning and disinfection difficult after use, which can easily lead to bacterial growth. Furthermore, it is impossible to visually determine the remaining amount of medication, which may affect subsequent medication plans.

[0003] Therefore, there is an urgent need for a specialized application device that is suitable for the use scenarios of hepatobiliary and pancreatic surgery patients and can solve the above problems at the same time. Summary of the Invention

[0004] To overcome the existing problems, this application provides a quantitative drug dispensing and external application device to solve the problems of easy drug backflow and contamination, inconvenient operation, insufficient quantitative accuracy and poor maintainability in the prior art.

[0005] The technical solution adopted by the embodiments of this application to solve its technical problem is: A quantitative dispensing device for external application includes a drug storage component for holding the drug to be applied; A quantitative transmission component is disposed at the top of the drug storage component and is detachably connected to the drug storage component for driving the quantitative extrusion of the drug inside the drug storage component; The dispensing mechanism is located at the bottom of the drug storage component and includes a connecting cylinder connected to the drug storage component. The cylinder has a one-way valve body inside to prevent the liquid medicine from flowing back. A rotating component is detachably installed at the bottom of the connecting cylinder. The rotating assembly includes a connecting cover with a rotating seat at its bottom. A sliding seat is provided at the intersection of the connecting cover and the rotating seat. With the sliding seat, the connecting cover and the rotating seat are rotatable. The rotating seat has several leakage holes inside. By rotating the rotating seat, the positional relationship between the leakage holes and the one-way valve body can be changed, thereby achieving multi-channel switching.

[0006] Preferably, the quantitative transmission assembly includes a control box and a cylinder body disposed at the bottom of the control box; A piston rod connected to the power output end of the cylinder body, and a piston plate disposed at the end of the piston rod; The piston plate is located inside the drug storage assembly and is in sliding and sealing fit with its inner wall.

[0007] Preferably, the drug storage assembly includes a first annular plate, a second annular plate, and a vertical support; The first and second annular plates are connected by multiple vertical supports to form a transparent drug storage cavity; A holding plate is fixedly connected to the outer wall of the second annular plate. The holding plate is provided with a start button, which is electrically connected to the control box.

[0008] Preferably, the vertical support is fixedly connected to the first annular plate, the vertical support is slidably connected to the second annular plate, the vertical support is screwed onto the upper surface of the second annular plate with a first connecting nut, and the vertical support is provided with a second connecting nut on the lower surface of the second annular plate; The first connecting nut and the second connecting nut are connected to the vertical support to fix the second annular plate.

[0009] Preferably, the one-way valve body includes a valve body, an inlet pipe disposed on the upper surface of the valve body, and an outlet pipe disposed on the lower surface of the valve body; The inlet pipe is connected to the inside of the drug storage component, and the outlet pipe is connected to the inside of the rotating component.

[0010] Preferably, the inner wall of the connecting cover is provided with a threaded groove, the outer wall of the connecting cover is provided with a positioning groove, and the outer wall of the rotating seat is provided with a positioning line at a position corresponding to the positioning groove; Specifically, when the positioning line is aligned with the positioning groove, the leakage hole corresponds to the liquid outlet pipe inside the one-way valve body.

[0011] Preferably, an applicator head is mounted on the bottom of the rotating assembly, and an end cap is detachably mounted on the bottom end of the rotating assembly via a magnet.

[0012] Preferably, the applicator head is a ball-type applicator, and the applicator head and the rotating assembly are detachable for easy cleaning and disinfection.

[0013] Preferably, the number of the leakage holes is four, and the diameter of the four leakage holes is larger than the diameter of the liquid outlet pipe; Wherein, after the rotating assembly is connected to the connecting cylinder, the bottom end of the liquid outlet pipe contacts the upper surface wall of the leak hole.

[0014] Preferably, the start button is electrically connected to the quantitative transmission component.

[0015] The advantages of the embodiments of this application are: By incorporating a one-way valve body inside the connecting cylinder, its unidirectional flow ensures that the medication can only flow from the storage component to the application head. When the application head contacts the wound, even with negative pressure or squeezing, wound exudate or residual medication cannot flow back into the storage component through the one-way valve. This structure completely cuts off the contamination path from a hydrodynamic perspective, avoiding the risk of contaminating the entire bottle of medication, significantly reducing the possibility of cross-infection for patients, and ensuring medication safety.

[0016] With a grip plate located on the outside of the drug storage component and an integrated start button, patients only need to hold the device with one hand, and their thumb can reach the button to complete the drug administration. The other hand can be completely freed up to fix the body or support the tubing. The drug storage, dosing, and application functions are integrated into one, eliminating the need to dip and apply the drug as in the traditional method, reducing the number of operation steps. It is especially suitable for hepatobiliary and pancreatic surgery patients with intravenous lines and limited limb movement after surgery to complete the medication independently.

[0017] The quantitative transmission component drives the piston plate to move linearly. By controlling the stroke of the piston rod, the volume of medicine squeezed out each time can be precisely controlled, avoiding dosage errors caused by manual operation. This ensures efficacy and reduces waste.

[0018] The rotating assembly has multiple drainage holes on its rotating base. When a patient needs to use different medications, they can quickly switch to different delivery channels simply by rotating the rotating base, without disassembling the device. This not only avoids cross-mixing of different medications inside the device but also simplifies the tedious process of changing medications. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the overall structure of the quantitative drug dispensing and external application device of the present invention; Figure 2 This is a schematic diagram of the overall structure of the quantitative drug dispensing and external application device of the present invention without the end cap; Figure 3 This is a schematic diagram of the overall structure of the application mechanism in the quantitative drug dispensing and external application device of the present invention; Figure 4 This is an exploded view of the application mechanism in the quantitative drug dispensing and external application device of the present invention; Figure 5 This is a schematic diagram of the overall structure of the quantitative transmission component in the quantitative dispensing and external application device of the present invention; Figure 6 This is a schematic diagram of the overall structure of the drug storage component in the quantitative drug dispensing and external application device of the present invention; Figure 7 This is a schematic diagram of the overall structure of the connection between the vertical support and the first circular plate in the drug storage component of the quantitative drug dispensing external application device of the present invention; Figure 8 This is a schematic diagram of the overall structure of the rotating component in the quantitative dispensing and external application device of the present invention; Figure 9 This is a schematic diagram of the overall structure of the one-way valve body in the quantitative drug dispensing and external application device of the present invention.

[0021] Explanation of key figure labels: 1. Quantitative transmission assembly; 11. Control box; 12. Cylinder body; 13. Piston rod; 14. Piston plate; 2. Drug storage assembly; 21. First annular plate; 22. Second annular plate; 23. Vertical support; 24. Holding plate; 25. Start button; 26. First connecting nut; 27. Second connecting nut; 3. Connecting cylinder; 4. Rotating assembly; 41. Connecting cover; 42. Rotating seat; 43. Slide seat; 44. Leakage hole; 45. Positioning line; 46. Positioning groove; 5. End cap; 6. Application head; 7. One-way valve body; 71. Valve body; 72. Inlet pipe; 73. Outlet pipe. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. In addition, for the sake of convenience, the terms "upper," "lower," "left," and "right" are equivalent to the upper, lower, left, and right directions of the accompanying drawings themselves, and the terms "first," "second," etc., are used for descriptive purposes and have no other special meaning.

[0023] This application provides a quantitative dispensing and topical application device that addresses the problems in the prior art. By incorporating a one-way valve body inside the connecting cylinder, its unidirectional flow ensures that the medication can only flow from the storage component to the application head. When the application head contacts the wound, even with negative pressure or squeezing, wound exudate or residual medication cannot flow back into the storage component through the one-way valve. This structure completely cuts off the contamination path from a hydrodynamic perspective, avoiding the risk of contaminating the entire bottle of medication, significantly reducing the possibility of cross-infection for patients, and ensuring medication safety.

[0024] With a grip plate located on the outside of the drug storage component and an integrated start button, patients only need to hold the device with one hand, and their thumb can reach the button to complete the drug administration. The other hand can be completely freed up to fix the body or support the tubing. The drug storage, dosing, and application functions are integrated into one, eliminating the need to dip and apply the drug as in the traditional method, reducing the number of operation steps. It is especially suitable for hepatobiliary and pancreatic surgery patients with intravenous lines and limited limb movement after surgery to complete the medication independently.

[0025] The quantitative transmission component drives the piston plate to move linearly. By controlling the stroke of the piston rod, the volume of medicine squeezed out each time can be precisely controlled, avoiding dosage errors caused by manual operation. This ensures efficacy and reduces waste.

[0026] The rotating assembly has multiple drainage holes on its rotating base. When a patient needs to use different medications, they can quickly switch to different delivery channels simply by rotating the rotating base, without disassembling the device. This not only avoids cross-mixing of different medications inside the device but also simplifies the tedious process of changing medications.

[0027] The technical solution in this application is to solve the above problems, and the overall approach is as follows: Example This embodiment provides a specific structure for a quantitative drug dispensing and external application device, such as... Figure 1-9 As shown, it includes a drug storage component 2 for holding the drug to be applied; A quantitative transmission component 1 is disposed at the top of the drug storage component 2 and is detachably connected to the drug storage component 2, and is used to drive the quantitative extrusion of the drug inside the drug storage component 2. The dispensing mechanism is located at the bottom of the drug storage component 2 and includes a connecting cylinder 3 connected to the drug storage component 2. The connecting cylinder 3 has a one-way valve body 7 inside to prevent the liquid medicine from flowing back. A rotating component 4 is detachably installed at the bottom of the connecting cylinder 3. The rotating component 4 includes a connecting cover 41 with a rotating seat 42 at its bottom. A slide 43 is provided at the intersection of the connecting cover 41 and the rotating seat 42. With the slide 43, the connecting cover 41 and the rotating seat 42 are rotatable. Several leakage holes 44 are provided inside the rotating seat 42. By rotating the rotating seat 42, the positional relationship between the leakage holes 44 and the one-way valve body 7 can be changed, thereby achieving multi-channel switching.

[0028] The inner wall of the connecting cover 41 is provided with a threaded groove, the outer wall of the connecting cover 41 is provided with a positioning groove 46, and the outer wall of the rotating seat 42 is provided with a positioning line 45 at the corresponding position of the positioning groove 46. When the positioning line 45 is aligned with the positioning groove 46, the leakage hole 44 corresponds to the liquid outlet pipe 73 inside the one-way valve body 7.

[0029] There are four leak holes 44, and the diameter of the four leak holes 44 is larger than the diameter of the outlet pipe 73. In this process, after the rotating assembly 4 is connected to the connecting cylinder 3, the bottom end of the liquid outlet pipe 73 contacts the upper surface wall of the leakage hole 44.

[0030] Furthermore, the rotating assembly 4 includes a connecting cover 41 and a rotating seat 42. The inner wall of the connecting cover 41 is provided with a threaded groove for engaging with the external thread at the bottom of the connecting cylinder 3. The rotating seat 42 is rotatably mounted on the bottom of the connecting cover 41 via an annular slide 43. The rotating seat 42 has four through-holes 44 inside, the diameter of which is larger than the diameter of the outlet pipe 73. When the rotating assembly 4 is connected to the connecting cylinder 3, the bottom end of the outlet pipe 73 is in contact with the upper surface wall of the rotating seat 42 and directly opposite one of the through-holes 44. To ensure precise alignment, the outer surface wall of the connecting cover 41 is provided with a positioning groove 46, and the outer surface wall of the rotating seat 42 is provided with a positioning line 45 at the corresponding position of the positioning groove 46. When the positioning line 45 on the surface wall of the rotating seat 42 is aligned with the positioning groove 46, the currently selected through-hole 44 corresponds vertically with the outlet pipe 73 of the one-way valve body 7, forming a smooth liquid channel. The other three drain holes are blocked by the bottom wall of the connecting cap 41. With this structure, different drain hole channels 44 can be quickly switched by simply rotating the rotating seat 42, which can be used to flow out liquids of different types or viscosities, avoiding cross-mixing.

[0031] The four drain holes 44 on the rotating base 42 are engaged with the liquid outlet pipe 73 of the one-way valve through rotation. When the positioning line 45 aligns with the positioning groove 46, the drain holes 44 and the liquid outlet pipe 73 are precisely aligned, and the liquid channel is opened. This engagement enables rapid physical switching between multiple channels. For example, the four drain holes 44 can each correspond to different prescription drugs or different dosage forms. During use, simply rotating the rotating base 42 allows for instant switching of medications without disassembly and cleaning, thus avoiding cross-contamination and improving medication change efficiency.

[0032] The quantitative transmission assembly 1 includes a control box 11 and a cylinder body 12 disposed at the bottom of the control box 11; The piston rod 13 is connected to the power output end of the cylinder body 12, and the piston plate 14 is disposed at the end of the piston rod 13; Piston plate 14 is located inside drug storage assembly 2 and is in sliding sealing cooperation with its inner wall.

[0033] Furthermore, the cylinder body 12 serves as a power source, with a piston rod 13 connected to its power output end. A piston plate 14 is fixed to the end of the piston rod 13. The piston plate 14 is located inside the drug storage assembly 2 and forms a sliding seal with the inner wall of the drug storage assembly 2. When the cylinder body 12 is started, it drives the piston rod 13 to move the piston plate 14 downward, thereby squeezing the liquid medicine. Quantitative extrusion is achieved by precisely controlling the cylinder stroke.

[0034] The drug storage assembly 2 includes a first annular plate 21, a second annular plate 22, and a vertical support 23; The first annular plate 21 and the second annular plate 22 are connected by multiple vertical supports 23 to form a transparent drug storage cavity; A holding plate 24 is fixedly connected to the outer wall of the second annular plate 22. A start button 25 is provided on the holding plate 24. The start button 25 is electrically connected to the control box 11 and the quantitative transmission component 1.

[0035] The vertical support 23 is fixedly connected to the first annular plate 21, and the vertical support 23 is slidably connected to the second annular plate 22. The vertical support 23 passes through the upper surface of the second annular plate 22 and is screwed with the first connecting nut 26. The vertical support 23 is located on the lower surface of the second annular plate 22 and is provided with the second connecting nut 27. The first connecting nut 26 and the second connecting nut 27 are connected to the vertical support 23 to fix the second annular plate 22.

[0036] Furthermore, the drug storage assembly 2 includes a first annular plate 21, a second annular plate 22, and vertical supports 23. The first annular plate 21 and the second annular plate 22 are connected by multiple vertical supports 23 to form a transparent cylindrical drug storage cavity. To facilitate one-handed operation by the patient, an ergonomic grip plate 24 is fixedly connected to the outer wall of the second annular plate 22. The grip plate 24 is equipped with a start button 25, which is electrically connected to the circuit board in the control box 11 to control the start and stop of the cylinder body 12. The vertical supports 23 are fixedly connected to the top first annular plate 21 and slidably connected to the bottom second annular plate 22. The threaded end of the vertical support 23 passes through the upper surface of the second annular plate 22 and is screwed with a first connecting nut 26. A second connecting nut 27 is provided at the lower surface of the vertical support 23 on the second annular plate 22. By tightening the first connecting nut 26 and the second connecting nut 27, the second annular plate 22 can be clamped and fixed in the preset position of the vertical support 23, thereby fixing the length of the medicine storage cavity. This structure is not only easy to assemble and disassemble, but also allows the volume of the medicine storage cavity to be adjusted according to the dosage requirements. After loosening the nuts, the second annular plate 22 can slide along the vertical support 23. After adjustment, it can be tightened and fixed, making the operation very convenient.

[0037] The one-way valve body 7 includes a valve body 71, an inlet pipe 72 disposed on the upper surface of the valve body 71, and an outlet pipe 73 disposed on the lower surface of the valve body 71. The inlet pipe 72 is internally connected to the drug storage component 2, and the outlet pipe 73 is internally connected to the rotating component 4. The inlet pipe 72 connects to the drug storage chamber, and the outlet pipe 73 connects to the rotating component 4. The one-way valve body 7 is connected in series in the middle of the drug passage. Its combined effect is as follows: during extrusion, the drug pressure opens the one-way valve, allowing the drug to pass normally; when extrusion stops or the application head is under pressure, the one-way valve closes instantly. This completely blocks the path of wound exudate or residual drug from the application head 6 back to the drug storage component 2 via the outlet pipe 73, fundamentally ensuring the sterility of the drug in the storage chamber.

[0038] Furthermore, the one-way valve body 7 includes a valve body 71, an inlet pipe 72 disposed on the upper surface of the valve body 71, and an outlet pipe 73 disposed on the lower surface of the valve body 71. The inlet pipe 72 is internally connected to the drug storage assembly 2 and is used to receive the extruded drug solution; the outlet pipe 73 is internally connected to the rotating assembly 4 and is used to discharge the drug solution. The one-way valve only allows the drug solution to flow from the inlet pipe 72 to the outlet pipe 73, and stops it in the opposite direction.

[0039] The bottom of the rotating component 4 is equipped with an applicator head 6. The end cap 5 is detachably installed at the bottom of the applicator head 6 via a magnet. The applicator head 6 is a ball-type applicator structure. The applicator head 6 and the rotating component 4 are detachable for easy cleaning and disinfection.

[0040] Furthermore, an application head 6 is installed at the bottom of the rotating assembly 4 for evenly applying the medication to the affected area. The application head 6 is preferably a ball-bearing type, utilizing the rolling motion of the balls to achieve smooth application. For easy cleaning and disinfection, the application head 6 is detachably connected to the rotating assembly 4. Additionally, an end cap 5 is detachably installed at the bottom of the rotating assembly 4, located at the application head 6, via a magnet. The end cap 5 covers the application head 6 when the device is not in use, providing dust protection; the magnetic connection makes it extremely convenient to remove and place the end cap 5.

[0041] Working principle: In the initial state, the medicine is filled into the transparent medicine storage assembly 2, which is composed of the first annular plate 21, the second annular plate 22 and the vertical support 23, and the piston plate 14 is located at the top of the medicine storage chamber.

[0042] When the patient holds the grip plate 24 and presses the start button 25, the circuit in the control box 11 is activated, triggering the cylinder body 12 to operate. The cylinder body 12 generates power, driving the piston rod 13 to extend downward in a linear motion.

[0043] The piston rod 13 pushes the piston plate 14 to slide downwards along the inner wall of the drug storage assembly 2. Since the piston plate 14 and the inner wall of the drug storage assembly 2 are in a sliding seal fit, as the piston plate 14 moves downwards, the liquid medicine at the bottom of the drug storage chamber is squeezed, and the pressure increases.

[0044] By precisely controlling the stroke length of the cylinder body 12 each time, the volume of the extruded liquid medicine can be accurately measured, thereby achieving the purpose of quantitative drug administration.

[0045] Under pressure, the squeezed liquid first enters the one-way valve body 7, then flows from the inlet pipe 72 into the valve body 71, pushes open the valve core inside the one-way valve, and flows out through the outlet pipe 73.

[0046] When the application action stops or the application head 6 is squeezed, the pressure at the outlet pipe 73 may rise instantaneously. At this time, the valve core inside the one-way valve body 7 closes rapidly under reverse pressure or spring action, cutting off the passage between the outlet pipe 73 and the inlet pipe 72.

[0047] This one-way flow characteristic ensures that the medication can only flow from the storage component 2 to the application end, while exudate or residual medication at the wound cannot flow back into the storage component 2 through the one-way valve, fundamentally eliminating the risk of the entire bottle of medication being contaminated.

[0048] After the liquid medicine flows out from the outlet pipe 73 of the one-way valve body 7, it enters the rotating assembly 4. The core of the rotating assembly 4 is the relative rotation structure formed by the connecting cover 41 and the rotating seat 42 through the slide 43. The rotating seat 42 has multiple leakage holes 44. When it is necessary to change the liquid medicine or adjust the medicine dispensing method, the operator manually rotates the rotating seat 42. The rotating seat 42 rotates relative to the fixed connecting cover 41 until the positioning line 45 on the outer wall of the rotating seat 42 is engaged in the corresponding positioning groove 46 on the outer wall of the connecting cover 41, and positioning feedback is emitted.

[0049] At this point, a selected drain hole 44 on the rotating seat 42 is aligned and connected to the liquid outlet pipe 73 of the one-way valve body 7. Since the diameter of the drain hole 44 is larger than that of the liquid outlet pipe 73, and the bottom end of the liquid outlet pipe 73 contacts the upper surface wall of the drain hole 44, it ensures that the medication can completely flow into the drain hole 44 without leakage. The medication then flows through this drain hole 44 into the application head 6 below, while other misaligned drain holes 44 are blocked by the bottom wall of the connecting cap 41 and are in a closed state. This principle enables rapid switching between multiple drug delivery channels within a single device.

[0050] After passing through the selected drain hole 44, the medication flows to the application head 6. After use, the patient can easily reattach the end cap 5 to the bottom of the rotating assembly 4 using a magnet. The magnetic attachment makes it extremely convenient to pick up and put away the end cap 5, effectively preventing dust and protecting the application head 6 from contamination, without increasing the difficulty of use for the patient.

[0051] Since the applicator head 6 and the rotating component 4 are detachably connected, they can be removed after use for thorough cleaning and disinfection to prevent bacterial growth and facilitate the next use.

[0052] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A metered dose dispensing topical applicator characterized by, include: Drug storage component (2) is used to hold the drug to be applied; A quantitative transmission component (1) is disposed at the top of the drug storage component (2) and is detachably connected to the drug storage component (2) for driving the quantitative extrusion of the drug inside the drug storage component (2); The dispensing mechanism is located at the bottom of the drug storage component (2) and includes a connecting cylinder (3) connected to the drug storage component (2). A one-way valve body (7) is provided inside the cylinder to prevent the liquid from flowing back. A rotating component (4) is detachably installed at the bottom of the connecting cylinder (3). The rotating component (4) includes a connecting cover (41) with a rotating seat (42) at its bottom. A slide (43) is provided at the intersection of the connecting cover (41) and the rotating seat (42). With the slide (43) in place, the connecting cover (41) and the rotating seat (42) are rotatable. The rotating seat (42) has several leakage holes (44) inside. By rotating the rotating seat (42), the positional relationship between the leakage holes (44) and the one-way valve body (7) can be changed, thereby achieving multi-channel switching.

2. A metered dose dispensing applicator according to claim 1, wherein, The quantitative transmission assembly (1) includes a control box (11) and a cylinder body (12) disposed at the bottom of the control box (11). The piston rod (13) connected to the power output end of the cylinder body (12), and the piston plate (14) disposed at the end of the piston rod (13). The piston plate (14) is located inside the drug storage assembly (2) and is in sliding and sealing cooperation with its inner wall.

3. A metered dose dispensing applicator according to claim 2, wherein, The drug storage assembly (2) includes a first annular plate (21), a second annular plate (22), and a vertical support (23); The first annular plate (21) and the second annular plate (22) are connected by multiple vertical supports (23) to form a transparent drug storage cavity; A holding plate (24) is fixedly connected to the outer wall of the second annular plate (22). The holding plate (24) is provided with a start button (25), which is electrically connected to the control box (11).

4. A metered dose dispensing applicator according to claim 3, wherein, The vertical support (23) is fixedly connected to the first annular plate (21), and the vertical support (23) is slidably connected to the second annular plate (22). The vertical support (23) is screwed through the upper surface of the second annular plate (22) and a first connecting nut (26) is provided. The vertical support (23) is located on the lower surface of the second annular plate (22) and a second connecting nut (27) is provided. The first connecting nut (26) and the second connecting nut (27) are connected to the vertical support (23) to fix the second annular plate (22).

5. The quantitative dispensing and external application device according to claim 1, characterized in that, The one-way valve body (7) includes a valve body (71), an inlet pipe (72) disposed on the upper surface of the valve body (71), and an outlet pipe (73) disposed on the lower surface of the valve body (71). The inlet pipe (72) is internally connected to the drug storage component (2), and the outlet pipe (73) is internally connected to the rotating component (4).

6. The quantitative dispensing and external application device according to claim 5, characterized in that, The inner wall of the connecting cover (41) is provided with a threaded groove, the outer wall of the connecting cover (41) is provided with a positioning groove (46), and the outer wall of the rotating seat (42) is provided with a positioning line (45) at the corresponding position of the positioning groove (46). When the positioning line (45) is aligned with the positioning groove (46), the leakage hole (44) corresponds to the liquid outlet pipe (73) inside the one-way valve body (7).

7. The quantitative dispensing and external application device according to claim 1, characterized in that, The bottom of the rotating assembly (4) is equipped with an applicator (6), and the bottom end of the rotating assembly (4) is detachably equipped with an end cap (5) via a magnet.

8. A quantitative dispensing and external application device according to claim 7, characterized in that, The applicator (6) is a ball-type applicator, and the applicator (6) and the rotating assembly (4) are detachable for easy cleaning and disinfection.

9. A quantitative dispensing and external application device according to claim 7, characterized in that, The number of the leakage holes (44) is four, and the diameter of the four leakage holes (44) is larger than the diameter of the liquid outlet pipe (73); Wherein, after the rotating assembly (4) is connected to the connecting cylinder (3), the bottom end of the liquid outlet pipe (73) contacts the upper surface wall of the leakage hole (44).

10. A quantitative dispensing and external application device according to claim 3, characterized in that, The start button (25) is electrically connected to the quantitative transmission component (1).

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