An adjustable-depth dermatological traditional Chinese medicine external use drug delivery device and a method of using the same

Abstract

The application relates to the technical field of medical devices, in particular to a skin department traditional Chinese medicine external use dosing device with adjustable depth and a use method thereof, which comprises an outer pipe, a movable adjusting and limiting collecting assembly suitable for being embedded in an anal recess and capable of collecting waste liquid is arranged outside the outer pipe, a medicine injection pipe is arranged in the outer pipe, a medicine pushing driving assembly capable of positioning the position of the medicine injection pipe and pushing medicine is arranged on the outer pipe, an anti-backflow valve group is arranged on the medicine outlet end of the outer pipe and the medicine outlet end of the medicine injection pipe, and a driving dynamic sealing structure capable of dynamically sealing the medicine outlet end of the medicine injection pipe is further arranged in the outer pipe. Compared with the prior art, the skin department traditional Chinese medicine external use dosing device with adjustable depth and the use method thereof not only realize accurate depth positioning and anti-slip anchoring, but also form a negative pressure cavity through conical surface fitting, provide a sealed environment for a sewage discharge channel, forcibly guide the overflow sewage into a bypass for discharge, and completely solve the anal pollution problem.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an adjustable-depth external application device for dermatological traditional Chinese medicine and its usage method. Background Technology

[0002] In clinical treatment of anorectal diseases, it is often necessary to directly inject traditional Chinese medicine ointments into the lesions inside the anal canal. Due to the unique anatomical structure of the anal canal, including its physiological characteristics such as sphincter contraction and anal opening retraction, existing drug delivery devices present the following significant drawbacks in practical use: 1. Difficulty in accurately determining the depth and easy slippage: Most existing drug delivery tubes are straight-through and lack limiting structures. The depth of insertion depends entirely on the doctor's feel. It is very easy to insert too deep and damage the intestinal wall or too shallow and fail to reach the lesion. In addition, there is no effective support at the anus, and the tube is very easy to slide and shift when pushing the drug.

[0003] 2. Severe medication leakage upon tube removal: The anal sphincter has a strong contractile force. At the moment of tube removal, the squeezing effect of the sphincter causes a large amount of medication and intestinal fluid to overflow back. Most existing devices only have a single one-way valve at the front end, which cannot withstand the instantaneous high pressure of the sphincter. The medication is very likely to flow back from the tube opening and the gaps between the inner and outer tube walls, which not only wastes the medication and affects the efficacy, but also leads to tube wall contamination and increases the risk of cross-infection. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an adjustable-depth external application device for dermatological traditional Chinese medicine and its usage method. Its core concept lies in "adapting to anatomy and leveraging external forces," transforming the contraction and squeezing force of the sphincter muscle into a driving force for the device's leak-proof sealing, thus achieving precise depth setting, pulsed drug delivery, three-dimensional leak prevention, and drainage synergy.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: an adjustable-depth dermatological herbal medicine external application device, comprising an outer tube, an adjustable limiting collection component on the outside of the outer tube suitable for embedding in the anal retraction and collecting waste liquid, an injection tube inside the outer tube, a pushing drive component for positioning the injection tube and pushing the medicine, anti-backflow valves at the drug outlet ends of the outer tube and the injection tube, and a driving dynamic sealing structure for dynamically sealing the drug outlet end of the injection tube. Traditional flat baffles cannot adapt to the unique anal retraction anatomical shape, failing to effectively limit the flow and causing leakage of waste liquid to the surrounding area. The present invention, by setting a conformally embedded limiting collection component, cleverly utilizes the negative pressure adsorption effect created by the perianal retraction, achieving a fixed depth and preventing slippage while forcibly guiding the originally disorderly overflowing waste liquid into the collection area. The injection resistance of high-viscosity herbal ointments is much greater than that of ordinary aqueous solutions. Using conventional push rods can easily lead to jamming or uneven pushing force. The push-drive component of this invention, through mechanical positioning and drive linkage, ensures the stability of the injection tube while providing continuous, uniform high-pressure pushing force. During tube removal, the sphincter muscle generates significant centripetal extrusion pressure, making a single valve body easily ruptured. The dual valve assembly constructed in this invention forms two layers of physical damping, gradually attenuating the kinetic energy of the backflow of the medication. The dynamic sealing structure transforms the "physiological squeezing force" of the anal sphincter contraction into the "mechanical sealing force" that drives the sealing structure to grip the tube wall, achieving adaptive dynamic sealing at the moment when leakage is most likely during tube removal.

[0006] Optionally, the limiting collection assembly includes a limiting plate that can slide along the axial direction of the outer tube and is positionally adjustable. The limiting plate has a trapezoidal embedding block that can be embedded in the anal recess. The trapezoidal embedding block has a liquid guiding groove, and the limiting plate has a collection groove plate that matches the liquid guiding groove. Existing limiting structures are mostly ring-type, which not only fail to fit the perianal skin but also widen the anus, causing sewage to flow out. The trapezoidal embedding block of this solution is convex funnel-shaped, and its conical surface perfectly matches the anatomical feature of the anus contracting inward. When embedded, it not only blocks the path of tube slippage but also seals the anus like a bottle stopper, establishing a sealed negative pressure chamber for subsequent sewage discharge. The intercepted sewage can only enter the collection groove plate by gravity and the guiding groove, achieving physical isolation between the sewage discharge and drug delivery channels.

[0007] Optionally, the trapezoidal embedding block is installed on one side of the limiting plate, and a limiting ring is provided on the other side of the limiting plate. The limiting ring has a protrusion that can slide along a groove on the surface of the outer tube. A positioning pin for the limiting ring, which can be inserted into the outer tube, is provided on the outside of the limiting ring. The collecting trough plate is installed at the bottom of the limiting plate, and a liquid outlet pipe is provided inside the collecting trough plate. This solution clarifies the mechanical implementation path of depth adjustment and sewage drainage. The cooperation between the protrusion and the groove prevents the limiting plate from circumferentially deflecting during sliding, ensuring the accuracy of the scale adjustment; the positioning pin provides a locking and anti-reverse function, ensuring that the insertion depth does not change when the medication is pushed; the collecting trough plate at the bottom conforms to the principle of gravity drainage, and the sewage overflows under pressure and naturally falls into the bottom collecting trough, then is discharged to the outside through the liquid outlet pipe, completely avoiding contact between the sewage and the doctor's gloves or the patient's skin.

[0008] Optionally, the drug-pushing drive assembly includes a limiting block with a slot. The limiting block presses the injection tube into the outer tube through the slot. The injection tube contains a sealing plug that can move axially and push the drug. The limiting block also contains a push rod that is detachably connected to the sealing plug and can drive the sealing plug to move axially. This solution achieves quick-release positioning of the injection tube and modular combination of the drug-pushing components. The limiting block, through the slot, not only firmly presses and positions the injection tube at the axis of the outer tube to prevent it from shaking during drug pushing, but also serves as a force-bearing support base for the push rod. The detachable connection allows the sealing plug and the push rod to move synchronously, and facilitates subsequent disassembly, cleaning, or replacement of consumables. The push rod converts the external driving force into the axial linear thrust of the sealing plug, ensuring absolute stability in the drug pushing direction.

[0009] Optionally, the limiting block is externally provided with a limiting block mounting pin for mounting the limiting block in the outer tube. The push rod is a rotating rod, and the sealing plug is provided with a connecting block. The push rod is connected to the connecting block via a pin, and the connecting block is provided with a pin positioning pin for positioning the pin. The rotating push rod transforms linear friction into helical stepping, generating continuous high pressure to overcome the viscous resistance of the traditional Chinese medicine. Combined with the energy storage effect of the buffer zone, the liquid medicine is ejected as a pulse jet after reaching the threshold, effectively breaking down the viscosity and achieving deep and uniform drug delivery. If a direct-press type push rod is used, the friction is large and the pushing force is difficult to maintain. This design uses a rotating push rod, combined with a threaded structure inside the outer tube, to convert the rotational torque of the finger into a powerful axial linear thrust (using the principle of spiral stepping). The thrust is smooth and irreversible, preventing jamming. The pin connection ensures that when the push rod rotates, the connecting block and the sealing plug only move in a linear motion and do not rotate with it, preventing the sealing plug from wearing out and leaking air. The pin positioning pin ensures that the hinge does not fall off when under force, achieving a closed loop of powerful transmission.

[0010] Optionally, the anti-backflow valve assembly includes a first one-way valve located at the outlet of the injection tube, and a second sealing slit at the outlet of the outer tube. The second sealing slit is configured to be normally closed by the elasticity of the material itself, and to open when pushed by the internal liquid, and to close when squeezed by the external sphincter when there is no internal pressure. This solution constructs a "sphincter extrusion" defense line with internal and external valves. The first one-way valve blocks the backflow of the liquid inside the injection tube from the source; the second sealing slit utilizes the elasticity of silicone to be normally closed, which not only prevents the invasion of external bacteria, but also, when the tube is pulled out and the internal pressure is lost, uses the "sphincter contraction and squeezing force" that would normally lead to leakage as the "mechanical closing force" to close the slit, realizing the conversion of anatomical pressure into closing force, and doubly blocking backflow.

[0011] Optionally, a buffer zone is provided between the drug outlet end of the outer tube and the injection tube. The buffer zone in this design is like an accumulator in a hydraulic system. In the initial stage of drug delivery, the liquid is temporarily stored here and pressure is accumulated. When the pressure reaches a threshold sufficient to overcome the second sealing incision, the liquid is instantly ejected in a pulse jet, effectively breaking the adhesive force of the ointment, achieving uniform application to deep lesions, and avoiding intermittent dripping of the liquid.

[0012] Optionally, the driven dynamic sealing structure includes a connecting plate disposed inside the outer tube and connected to the injection tube. The connecting plate has a flexible sealing lip extending inward to the wall of the injection tube. The outer circumference of the outer tube is provided with a squeezing part connected to the flexible sealing lip. When the squeezing part is squeezed by the contraction of the anal sphincter, it can push the connecting plate and squeeze the flexible sealing lip to tightly hold the wall of the injection tube, forming a dynamic seal. Traditional tube wall gap leak prevention relies solely on tolerance fit, which fails instantly under the high pressure of the sphincter. This solution designs a clear mechanical transmission path: when pushing the medicine, there is no external pressure, and the flexible sealing lip and the injection tube are in low-friction contact, so the medicine is pushed smoothly; when pulling the tube, the sphincter contracts and squeezes the squeezing part circumferentially. This pressure forces the outer tube wall to deform, pushing the connecting plate to move towards the center, thereby driving the flexible sealing lip to tightly hold the injection tube. The physiological squeezing force is perfectly converted into the tube wall sealing force, automatically locking the gap at the moment when leakage is most likely to occur when the tube is pulled out, producing a leak-proof effect that cannot be matched by conventional seals.

[0013] Optionally, the outer tube has a positioning plate inside the drug outlet end that can limit the position of the drug outlet end of the injection tube; the outer tube has graduation lines. The positioning plate provides radial support to the front end of the injection tube from the inside, preventing it from swinging or deviating when pushed by a high-pressure pulse, ensuring accurate jet direction; the graduation lines provide a quantitative reference for the sliding of the limiting collection component, allowing doctors to directly align and lock according to the depth of the lesion, eliminating subjective errors from inserting the tube by feel, and achieving truly precise drug delivery at a fixed depth.

[0014] A method for using an adjustable-depth topical application device for dermatological traditional Chinese medicine, characterized in that the method includes: Step 1: Depth and Anchoring. Based on the depth of the lesion, slide the limiting collection component along the outer tube axis to the corresponding scale line and lock it in place. Insert the device into the anal tube until the trapezoidal embedding block is embedded in the anal depression. Its conical surface forms a negative pressure fit and anchors with the perianal skin. At the same time, the liquid guide groove and collection groove plate in the trapezoidal embedding block construct a bypass sewage channel isolated from the drug administration channel. Step 2: High-pressure pulse drug delivery. Rotate the drug delivery rod and drive the sealing plug to move axially through the threaded stepper to overcome the resistance of the Chinese herbal ointment. The liquid first pushes open the first one-way valve and enters the buffer zone to accumulate pressure. When the pressure reaches the threshold, the liquid forcibly opens the second sealing incision, which is normally closed by its own elasticity, to form a pulse jet that is injected into the lesion. Step 3: Tube removal and dynamic leak prevention work in tandem. When the device is pulled out after medication is administered, the anal sphincter contracts strongly, generating a centripetal squeezing force that triggers a triple-linkage defense: the external sphincter pressure directly compresses the second sealing incision, causing it to close mechanically; at the same time, the sphincter squeezes the squeezing part outside the outer tube, pushing the connecting plate to force the flexible sealing lip to tightly grip the wall of the injection tube, sealing the gap between the tube walls; and the first one-way valve is drawn in and locked under the negative pressure inside the tube, achieving zero backflow of the medication. Step 4: Drainage and tube removal. During the tube removal process, the intestinal fluid and residual medication squeezed out by the sphincter are intercepted by the trapezoidal embedded block, collected through the drainage channel, and drained out through the outlet tube, keeping the surgical field of the anus clean, thus completing the removal of the device.

[0015] The working principle of this solution is as follows: This invention discloses an adjustable-depth topical application device for traditional Chinese medicine in dermatology. Its core working principle lies in "adapting to the anatomical shape of the anus and rectum, leveraging the contraction of the sphincter muscle," cleverly transforming the "physiological destructive force" that leads to leakage and slippage in traditional drug delivery methods into a "mechanical driving force" that ensures precise depth control and dynamic sealing. Its complete working process is divided into the following four coordinated stages according to the clinical operation sequence: Phase 1: Preoperative Depth Determination and Anatomical Anchoring in Linkage; Before the procedure, based on the depth of the lesion, the limiting collection component on the sliding tube is moved. The protrusion within the limiting ring moves along the groove to the corresponding scale line, and the limiting ring positioning pin is screwed in to lock the position. After inserting the anal tube, the trapezoidal insert is completely embedded in the anal recess. At this time, the conical surface of the trapezoidal insert completely adheres to the perianal skin, forming a negative pressure effect similar to a "suction cup," firmly anchoring the entire outer tube to the anus and completely preventing axial slippage of the tube during medication administration. Simultaneously, this negative pressure seal creates a sealed cavity bottom for the subsequent waste drainage channel, allowing the liquid guide groove and collection groove plate to form a bypass waste drainage channel physically isolated from the medication administration channel.

[0016] Phase Two: Intraoperative High-Pressure Stepping and Pulsed Injection Linkage; Traditional push rods are prone to jamming when dealing with high-viscosity traditional Chinese medicine ointments. This device rotates the push rod, which is linked to the connecting block via a pin, converting the rotational torque into a uniform axial stepping displacement of the sealing plug along the inner wall of the injection tube, generating continuous and irreversible high pressure. The medicine flows forward under pressure, first opening the first one-way valve to enter the buffer zone for temporary pressure storage; as the hydraulic pressure in the buffer zone continues to rise until it overcomes the elastic threshold of the silicone at the second sealing incision, the second sealing incision opens instantly, and the medicine breaks through the viscous resistance in a high-pressure pulse jet state, accurately injecting into the deep lesion and avoiding intermittent dripping of the medicine.

[0017] Phase Three: Three-Dimensional Dynamic Leakage Prevention Synergy During Tube Removal (Core Leakage Prevention Mechanism); When the device is pulled out after medication administration, the anal sphincter is stimulated and contracts strongly, generating a tremendous centripetal squeezing force. This squeezing force simultaneously triggers the device's triple dynamic defense mechanism, achieving zero backflow of the medication: Outer layer pressure sealing: The sphincter pressure directly acts on the second sealing incision at the front end of the outer tube, mechanically sealing the normally closed incision that has lost internal pressure, thus blocking backflow at the tube opening; Inner layer negative pressure suction: The external pulling of the device causes the micro-volume inside the tube to increase, generating negative pressure. This negative pressure firmly sucks the valve lip of the first one-way valve onto the valve seat, forming an internal suction lock. Dynamic sidewall clamping: The sphincter contraction pressure simultaneously and circumferentially squeezes the extrusion section 24 on the outside of the outer tube. The extrusion force forces the tube wall to deform, pushing the internal connecting plate to shift towards the center, which in turn drives the flexible sealing lip to instantly clamp the injection tube wall, completely sealing the gap between the inner and outer tube walls. The above three lines of defense are triggered by the same anatomical force (sphincter contraction) at the same instant, perfectly realizing the transformation of "physiological extrusion force" into "mechanical sealing force".

[0018] Phase Four: Interception and Aseptic Tube Removal in tandem; During tube removal and sphincter contraction, the forcibly squeezed intestinal fluid and residual medication are physically intercepted by the trapezoidal insert, preventing them from overflowing from the anus and contaminating the skin. Under the influence of gravity and compression, the waste fluid flows along the inner wall of the trapezoidal insert into the drainage channel, is collected by the collection plate, and then bypassed by the outlet tube to an external collection container, maintaining absolute cleanliness of the surgical field at the anus. Finally, the device is smoothly and aseptically withdrawn, completing the entire drug delivery closed loop.

[0019] (III) Beneficial Effects This invention provides an adjustable-depth topical application device for dermatological traditional Chinese medicine and its method of use, which has the following beneficial effects: This adjustable-depth dermatological herbal medicine external application device and its usage method, compared with the existing technology, not only achieves precise depth setting and anti-slip anchoring by setting a trapezoidal embedding block to fit the anatomical shape of the anal opening, but also forms a negative pressure cavity through the conical surface fitting, providing a sealed environment for the sewage channel, forcibly guiding the overflowing sewage into the bypass for discharge, and completely solving the problem of anal contamination.

[0020] This adjustable-depth topical dermatological herbal medicine delivery device and its usage method, compared with existing technologies, enable the external sphincter pressure to mechanically seal the second sealing incision during tube removal, while the negative pressure inside the tube draws in and locks the first one-way valve. Simultaneously, the sphincter squeezes the external squeezing part, and through mechanical transmission via the connecting plate, the flexible sealing lip instantly grips the injection tube (sealing the side wall gaps). These three lines of defense are triggered instantaneously by the same anatomical force, improving the backflow prevention effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 A side view of the structure; Figure 3 For the present invention Figure 1 A cross-sectional structural diagram; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A; Figure 5 For the present invention Figure 1 Exploded view; Figure 6 For the present invention Figure 5 A schematic diagram of the cross-sectional structure; Figure 7 For the present invention Figure 5 A side view structural diagram.

[0022] In the diagram: 1. Outer tube; 2. Limiting and collecting assembly; 3. Injection tube; 4. Pushing drive assembly; 5. Anti-backflow valve assembly; 6. Drive dynamic sealing structure; 7. Limiting plate; 8. Trapezoidal embedded block; 9. Liquid guide groove; 10. Collecting groove plate; 11. Limiting ring; 12. Limiting block; 13. Slot; 14. Sealing plug; 15. Pushing rod; 16. Limiting block mounting pin; 17. Connecting block; 18. Pin positioning pin; 19. First one-way valve; 20. Second sealing notch; 21. Buffer zone; 22. Connecting plate; 23. Flexible sealing lip; 24. Squeezing part; 25. Positioning plate; 26. Liquid outlet tube; 27. Protrusion; 28. Limiting ring positioning pin. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Please see Figures 1 to 7This invention provides a technical solution: an adjustable-depth external application device for dermatological traditional Chinese medicine, comprising an outer tube 1, characterized in that: the outer tube 1 is provided with a movable and adjustable limiting collection component 2, suitable for embedding into the anal recess and capable of collecting waste liquid; the limiting collection component 2 includes a limiting plate 7 that can slide along the axial direction of the outer tube 1 and is positionally adjustable; the limiting plate 7 is provided with a trapezoidal embedding block 8 that can be embedded into the anal recess; the trapezoidal embedding block 8 is provided with a liquid guiding groove 9; the limiting plate 7 is provided with a collection groove plate 10 adapted to the liquid guiding groove 9; the trapezoidal embedding block 8 is installed on one side of the limiting plate 7; the other side of the limiting plate 7 is provided with a limiting ring 11; the limiting ring 11 is provided with a sliding groove that can slide along the surface of the outer tube 1. The protrusion 27, the outer side of the limiting ring 11 is provided with a limiting ring positioning pin 28 that can be inserted into the outer tube 1, the collecting trough plate 10 is installed at the bottom end of the limiting plate 7, the collecting trough plate 10 is provided with a liquid outlet pipe 26, the drug pushing drive assembly 4 includes a limiting block 12, the limiting block 12 is provided with a slot 13, the limiting block 12 presses the drug injection tube 3 into the outer tube 1 through the slot 13, the drug injection tube 3 is provided with a sealing plug 14 that can move axially and push the drug, the limiting block 12 is provided with a drug pushing rod 15 that is detachably connected to the sealing plug 14 and can drive the sealing plug 14 to move axially, the outer side of the limiting block 12 is provided with a limiting block mounting pin 16 that installs the limiting block 12 into the outer tube 1, the drug pushing rod 15 is a rotating rod, the sealing plug 14 is provided with a limiting block mounting pin 16 that installs the limiting block 12 into the outer tube 1, the sealing plug 14 is provided with a limiting block positioning pin 28 that can be inserted into the outer tube 1, the collecting trough plate 10 is installed at the bottom end of the limiting plate 7, the collecting trough plate 10 is provided with a liquid outlet pipe 26, the drug pushing drive assembly 4 includes a limiting block 12, the limiting block 12 is provided with a limiting block positioning pin 28 that can be inserted into the outer tube 1 ... A connecting block 17 is provided, and the push rod 15 is connected to the connecting block 17 via a pin. The connecting block 17 is provided with a pin positioning pin 18 that can position the pin. An injection tube 3 is provided inside the outer tube 1. The outer tube 1 is provided with a push driving assembly 4 that can position the injection tube 3 and push the medicine. The medicine outlet end of the outer tube 1 and the medicine outlet end of the injection tube 3 are provided with an anti-backflow valve assembly 5. The anti-backflow valve assembly 5 includes a first one-way valve 19 located at the medicine outlet of the injection tube 3. The medicine outlet of the outer tube 1 is provided with a second sealing slit 20. The second sealing slit 20 is configured to be normally closed by the elasticity of the material itself, and to be opened when pushed by the internal medicine liquid. When there is no internal pressure, it is closed by the external sphincter. The medicine outlet end of the outer tube 1 and the injection tube 3 are connected. A buffer zone 21 is provided between the tubes 3. The outer tube 1 is also provided with a driving dynamic sealing structure 6 that can dynamically seal with the dispensing end of the injection tube 3. The driving dynamic sealing structure 6 includes a connecting plate 22 disposed inside the outer tube 1 and connected to the injection tube 3. The connecting plate 22 is provided with a flexible sealing lip 23 extending inward to the wall of the injection tube 3. The outer circumferential of the outer tube 1 is provided with a squeezing part 24 connected to the flexible sealing lip 23. When the squeezing part 24 is squeezed by the contraction of the anal sphincter, it can push the connecting plate 22 and squeeze the flexible sealing lip 23 to hug the wall of the injection tube 3 to form a dynamic seal. The dispensing end of the outer tube 1 is provided with a positioning plate 25 that can limit the position of the dispensing end of the injection tube 3. The outer tube 1 is provided with scale lines.

[0025] Please see Figures 1 to 7An adjustable-depth dermatological external application device for traditional Chinese medicine is characterized in that: the outer tube 1 is provided with a positioning plate 25 that can limit the position of the drug outlet of the injection tube 3; and the outer tube 1 is provided with scale lines.

[0026] A method for using an adjustable-depth topical application device for dermatological traditional Chinese medicine, characterized in that the method includes: Step 1: Depth and Anchoring. Based on the depth of the lesion, slide the limiting collection component 2 along the axial direction of the outer tube 1 to the corresponding scale line and lock it in place. Insert the device into the anal tube until the trapezoidal embedding block 8 is embedded in the anal recess. Its conical surface forms a negative pressure fit and anchors with the perianal skin. At the same time, the liquid guiding groove 9 and the collection groove plate 10 in the trapezoidal embedding block 8 construct a bypass sewage channel isolated from the drug administration channel. Step 2: High-pressure pulse drug delivery. Rotate the drug delivery rod 15 and drive the sealing plug 14 to move axially through the threaded stepping to overcome the resistance of the Chinese medicine ointment. The medicine liquid first pushes open the first one-way valve 19 and enters the buffer zone 21 to accumulate pressure. When the pressure reaches the threshold, the medicine liquid forcibly opens the second sealing incision 20, which is normally closed by its own elasticity, to form a pulse jet injected into the lesion. Step 3: Tube removal and dynamic leak prevention work together. When the device is pulled out after medication is completed, the anal sphincter contracts strongly, generating a centripetal squeezing force, triggering a triple-linkage defense: the external sphincter pressure directly compresses the second sealing incision 20 to make it mechanically close; at the same time, the sphincter squeezes the squeezing part 24 outside the outer tube 1, pushing the connecting plate 22 to force the flexible sealing lip 23 to hug the tube wall of the injection tube 3, sealing the tube wall gap; and the first one-way valve 19 is sucked and locked under the negative pressure inside the tube, realizing zero backflow of the liquid medicine; Step 4: Drainage and tube removal. During the tube removal process, the intestinal fluid and residual medication squeezed out by the sphincter are intercepted by the trapezoidal embedded block 8, collected by the drainage groove 9, and drained out through the outlet tube 26, keeping the anal surgical field clean and completing the removal of the device.

[0027] In the description of this specification, the terms "connection", "installation", "fixing", "setting", etc. are interpreted broadly. For example, "connection" can be a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and the technical effect. It can also be an integral connection or a partial connection. In such cases, those skilled in the art can understand the specific meaning of the above terms in this invention or invention according to the specific circumstances.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An adjustable depth dermatological traditional Chinese medicine external application device, comprising an outer tube (1), characterized in that: The outer tube (1) is provided with a movable and adjustable limiting collection component (2) that is suitable for embedding into the anal recess and can collect waste liquid. The outer tube (1) is provided with a drug injection tube (3). The outer tube (1) is provided with a drug pushing drive component (4) that can position the drug injection tube (3) and push the drug. The drug outlet end of the outer tube (1) and the drug outlet end of the drug injection tube (3) are provided with an anti-backflow valve group (5). The outer tube (1) is also provided with a drive dynamic sealing structure (6) that can dynamically seal with the drug outlet end of the drug injection tube (3).

2. The adjustable-depth traditional Chinese medicine external application administration device according to claim 1, characterized in that: The limiting collection assembly (2) includes a limiting plate (7) that can slide along the axial direction of the outer tube (1) and be positioned and adjusted. The limiting plate (7) is provided with a trapezoidal embedding block (8) that can be embedded in the anal recess. The trapezoidal embedding block (8) is provided with a liquid guiding groove (9). The limiting plate (7) is provided with a collection groove plate (10) that is adapted to the liquid guiding groove (9).

3. The adjustable-depth topical application device for dermatological traditional Chinese medicine according to claim 2, characterized in that: The trapezoidal embedded block (8) is installed on one side of the limiting plate (7), and the other side of the limiting plate (7) is provided with a limiting ring (11). The limiting ring (11) is provided with a protrusion (27) that can slide along the groove on the surface of the outer tube (1). The limiting ring (11) is provided with a limiting ring positioning pin (28) that can be inserted into the outer tube (1). The collecting trough plate (10) is installed at the bottom of the limiting plate (7), and the collecting trough plate (10) is provided with a liquid outlet pipe (26).

4. The adjustable-depth topical application device for dermatological traditional Chinese medicine according to claim 1, characterized in that: The drug pushing drive assembly (4) includes a limiting block (12), which has a slot (13). The limiting block (12) presses the injection tube (3) into the outer tube (1) through the slot (13). The injection tube (3) has a sealing plug (14) that can move axially and push the drug. The limiting block (12) has a pushing rod (15) that is detachably connected to the sealing plug (14) and can drive the sealing plug (14) to move axially.

5. The adjustable-depth topical application device for dermatological traditional Chinese medicine according to claim 4, characterized in that: The limiting block (12) is provided with a limiting block mounting pin (16) for mounting the limiting block (12) in the outer tube (1). The push rod (15) is a rotating rod. The sealing plug (14) is provided with a connecting block (17). The push rod (15) is connected to the connecting block (17) through a pin shaft. The connecting block (17) is provided with a pin shaft positioning pin (18) that can position the pin shaft.

6. The adjustable-depth topical application device for dermatological traditional Chinese medicine according to claim 1, characterized in that: The anti-backflow valve assembly (5) includes a first one-way valve (19) located at the outlet of the injection tube (3), and the outlet of the outer tube (1) is provided with a second sealing cut (20); the second sealing cut (20) is configured to be normally closed by the elasticity of the material itself, and to be opened when pushed by the internal liquid, and to be closed by the external sphincter when there is no internal pressure.

7. The adjustable-depth topical application device for dermatological traditional Chinese medicine according to claim 6, characterized in that: A buffer zone (21) is provided between the drug outlet end of the outer tube (1) and the drug injection tube (3).

8. The adjustable-depth topical application device for dermatological traditional Chinese medicine according to claim 1, characterized in that: The driving dynamic sealing structure (6) includes a connecting plate (22) disposed inside the outer tube (1) and connected to the injection tube (3). The connecting plate (22) is provided with a flexible sealing lip (23) extending inward to the wall of the injection tube (3). The outer tube (1) is provided with a squeezing part (24) connected to the flexible sealing lip (23) in the outer circumferential direction. When the squeezing part (24) is squeezed by the contraction of the anal sphincter, it can push the connecting plate (22) and squeeze the flexible sealing lip (23) to hug the wall of the injection tube (3) to form a dynamic seal.

9. The adjustable-depth topical application device for dermatological traditional Chinese medicine according to claim 8, characterized in that: The outer tube (1) has a positioning plate (25) inside the drug outlet end that can limit the position of the drug outlet end of the injection tube (3); the outer tube (1) has scale lines.

10. A method of using an adjustable-depth topical application device for dermatological traditional Chinese medicine, characterized in that: The method includes: Step 1: Depth and Anchoring. Based on the depth of the lesion, slide the limiting collection component (2) along the axial direction of the outer tube (1) to the corresponding scale line and lock it in place. Insert the device into the anal tube until the trapezoidal embedding block (8) is embedded in the anal depression. Its conical surface forms a negative pressure fit and anchors with the perianal skin. At the same time, the liquid guide groove (9) in the trapezoidal embedding block (8) and the collection groove plate (10) construct a bypass sewage channel isolated from the drug administration channel. Step 2: High-pressure pulse push medicine, rotate the push rod (15), drive the sealing plug (14) to move axially through the threaded step to overcome the resistance of the Chinese medicine ointment; the medicine liquid first pushes open the first one-way valve (19) and enters the buffer zone (21) to accumulate pressure. When the pressure reaches the threshold, the medicine liquid forcibly opens the second sealing incision (20) which is normally closed by its own elasticity, forming a pulse jet to inject into the lesion. Step 3: The tube removal and dynamic leak prevention work together. When the device is pulled out after the medication is finished, the anal sphincter contracts strongly to generate centripetal pressure, triggering a triple linkage defense: the external sphincter pressure directly compresses the second sealing incision (20) to make it mechanically close; at the same time, the sphincter squeezes the squeezing part (24) outside the outer tube (1), pushes the connecting plate (22) to force the flexible sealing lip (23) to hug the tube wall of the injection tube (3) and seal the tube wall gap; and the first one-way valve (19) is sucked and locked under the negative pressure inside the tube to achieve zero backflow of the liquid medicine; Step 4: Discharge and tube removal. During the tube removal process, the intestinal fluid and residual medicine squeezed out by the sphincter are intercepted by the trapezoidal embedded block (8), collected by the liquid guide groove (9), and drained out by the liquid outlet tube (26) to keep the anal surgical field clean and complete the removal of the device.

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