A device for placing an ointment in an external ear canal

Abstract

This invention discloses a device for placing ointment in the external auditory canal, relating to the field of medical device technology. The device includes a delivery tube, an extruder head, a push rod, and a transmission component. A piston is disposed within the delivery tube. The extruder head is rotatably mounted at one end of the delivery tube, with the end of the extruder head away from the delivery tube closed. The extruder head has a cavity communicating with the interior of the delivery tube, and extrusion holes communicating with the cavity are formed on the peripheral wall of the extruder head. This device, through the cooperation of a double-helix sliding rod and a piston, converts the axial thrust of the piston into the rotational power of the extruder head, causing the extruder head to rotate synchronously while pushing the ointment. Combined with multiple staggered and inclined extrusion holes, the ointment can be evenly applied to the circumferential wall of the external auditory canal at different depths, avoiding localized accumulation or blind spots, ensuring precise application of the medication to the affected area, and effectively improving the treatment effect.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a device for placing ointment in the external auditory canal. Background Technology

[0002] External auditory canal inflammation, injury and other ear diseases are common clinical conditions. During treatment, it is often necessary to apply ointment precisely to a designated location on the inner wall of the external auditory canal to ensure that the medication acts on the lesion area and improve the treatment effect.

[0003] Currently, the application of ointments to the external auditory canal in clinical practice mainly relies on two methods: one is for medical staff to use a cotton swab to apply the ointment into the patient's external auditory canal; the other is for the patient to squeeze the ointment into the external auditory canal themselves and then gently press it with their fingers or a cotton swab to spread it. However, both methods have problems with uneven ointment application and safety hazards. When applying with a cotton swab, the large size of the swab head makes it difficult to penetrate deep into the external auditory canal, and the ointment is easily lost due to friction during application, making it impossible to achieve even application. At the same time, it is difficult to control the force of inserting the cotton swab, which can easily cause scratches to the delicate external auditory canal mucosa, especially for patients with low cooperation such as children and the elderly, where the operation risk is even higher. The self-application method has the problem of extremely poor accuracy. The ointment tends to accumulate at the entrance of the external auditory canal and cannot reach the lesion. Blindly squeezing may lead to excessive ointment, causing ear canal blockage, affecting hearing, and even contaminating the ointment due to improper operation, increasing the risk of infection.

[0004] Based on the above, the present invention proposes a device for placing ointment in the external auditory canal, which can effectively solve the above problems. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a device for placing ointment in the external auditory canal, which solves the defects and deficiencies of the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A device for placing ointment in the external auditory canal includes a drug delivery tube, an extruder head, a push rod, and a transmission component. A piston is disposed within the drug delivery tube. The extruder head is rotatably mounted at one end of the drug delivery tube, with the end of the extruder head away from the drug delivery tube closed. The extruder head has a cavity communicating with the interior of the drug delivery tube, and an extrusion hole communicating with the cavity is formed on the peripheral wall of the extruder head. The push rod passes through the end of the drug delivery tube away from the extruder head and is used to push and pull the piston to move along the length of the drug delivery tube. The transmission component is disposed within the drug delivery tube and is used to convert the thrust of the piston moving along the length of the drug delivery tube into a power to drive the extruder head to rotate.

[0007] Preferably, the transmission component is a slide rod inserted inside the drug delivery tube. There are two slide rods, which are arranged in a double helix structure and distributed along the length of the drug delivery tube. One end of the two slide rods is fixedly connected to the extrusion head. The piston has two adapter holes that are adapted to the double helix structure of the two slide rods.

[0008] Preferably, the extrusion orifice has multiple channels, each channel is inclined from the inside of the extrusion head outward toward the direction away from the drug delivery tube, and the peripheral wall of the extrusion head is misaligned when multiple channels of extrusion orifice surround each other.

[0009] Preferably, a bushing is provided at the end of the extruder facing the administration tube, the bushing is sleeved with the administration tube, and a ring of balls is rolled between the inner circular surface of the bushing and the outer circular surface of the administration tube. A slip ring for limiting the ball is embedded in the gap between the bushing and the administration tube, and a retaining ring for limiting the slip ring is provided on the outer wall of the administration tube near the bushing.

[0010] Preferably, the end of the drug delivery tube away from the extruder is provided with an end plate, and the end plate is provided with a threaded ring seat that is threadedly fitted with the drug delivery tube. A sealing plug is provided on the side of the end plate facing the drug delivery tube, and the sealing plug is inserted into the drug delivery tube. A second threaded hole is opened in the middle of the end plate, and the push rod passes through the second threaded hole and extends into the drug delivery tube to be rotatably connected to the piston. The push rod is screwed into the second threaded hole. A push block is provided at the end of the push rod outside the drug delivery tube. A pair of first protruding shanks are symmetrically provided on the side wall of the end plate. The end plate is also provided with a pressure structure for pressing the push rod.

[0011] Preferably, the pressure-applying structure includes a clamping rubber and a compression block. The compression block is movably embedded in the end plate and can move toward the second threaded hole. A clamping rubber is provided on one end face of the compression block facing the second threaded hole. The compression block moves toward the second threaded hole and applies pressure to the push rod in the second threaded hole through the clamping rubber.

[0012] Preferably, a threaded ring is provided on the outer wall of the drug delivery tube near the extrusion head, and a sleeve block is threaded onto the threaded ring. The end of the sleeve block facing the extrusion head is spherical, and a gasket is wrapped on the spherical surface. A pair of second protruding shanks are symmetrically arranged on the top side wall of the sleeve block. Preferably, a rotating disk is horizontally rotatably mounted on the top of the sleeve block, and a guide bar is vertically fixed on the rotating disk. A limiting guide hole is vertically opened on the end plate on the side of the extrusion block away from the second threaded hole. The top of the guide bar passes through the limiting guide hole and penetrates the end plate. The side of the top of the guide bar facing the second threaded hole is set as an inclined surface. This inclined surface is inclined from bottom to top in the direction away from the second threaded hole. The end face of the extrusion block away from the second threaded hole is in contact with the inclined surface of the guide bar.

[0013] Preferably, a sealing ring is fitted on the piston peripheral wall, a guide groove is formed on the piston peripheral wall along the axial direction, a guide protrusion is provided on the inner wall of the administration tube along the length direction, the guide protrusion is slidably fitted with the guide groove, and a sealing gasket is provided on the adapter hole and the inner wall of the guide groove.

[0014] This invention provides a device for placing ointment in the external auditory canal. It has the following beneficial effects: 1. The device for placing ointment in the external auditory canal of the present invention utilizes a double-helix sliding rod in conjunction with a piston to convert the axial thrust of the piston into the rotational power of the extruder head. This allows the extruder head to rotate synchronously while pushing the ointment. Combined with multiple staggered and inclined extrusion orifices, the ointment can be evenly applied to the circumference and different depths of the inner wall of the external auditory canal, avoiding localized accumulation or blind spots, ensuring precise application of the medication to the affected area, and effectively improving the treatment effect. Simultaneously, the helical engagement between the push rod and the second threaded hole allows for precise control of the piston's movement distance, thereby regulating the amount of ointment pushed and preventing excessive or insufficient application.

[0015] 2. This invention uses a soft pad wrapped around the spherical end of the sleeve to fit snugly against the auricle, preventing the device from being inserted too deeply into the ear canal and causing damage. The position of the sleeve on the threaded platform can be adjusted by rotating it to adapt to the depth of the external auditory canal of different patients and meet the application needs of different lesion locations. The pressure-applying structure of the guide strip and the squeezing block can automatically adjust the rotational resistance of the push rod according to the depth of insertion into the ear canal, making it easy for the operator to accurately control the force applied, reducing the difficulty of operation, and allowing a single person to complete the entire application process without the need for multiple people. It is especially suitable for patients with low cooperation, such as children and the elderly.

[0016] 3. In this invention, the cooperation between the guide protrusion and the guide groove ensures the stability of the piston movement. The transmission structure of the double helical slide is simple and reliable, with high power transmission efficiency and is not prone to failure. The end plate and the drug delivery tube are connected by a threaded detachable connection, which facilitates the disassembly, cleaning, disinfection and ointment filling of the device, extends the service life of the device and reduces the cost of use. In addition, when the extruder head rotates in the reverse direction, the ointment remaining in the extrusion hole can be recycled into the cavity, reducing ointment waste. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the device for placing ointment in the external auditory canal according to the present invention; Figure 2 This is a schematic diagram of the internal structure of the drug delivery tube of the present invention; Figure 3 This is a schematic diagram of the extrusion head of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the extrusion head of the present invention; Figure 5 This is a schematic diagram of the piston structure of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the end plate and sleeve block of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the end plate of the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of the drug delivery tube and piston of the present invention.

[0018] In the diagram, 1. Drug delivery tube; 2. Extrusion head; 3. Extrusion orifice; 4. End plate; 5. Push rod; 6. Push block; 7. Sleeve block; 8. Rotary disk; 9. Guide bar; 10. First protruding shank; 11. Threaded ring seat; 12. Second protruding shank; 13. Gasket; 14. Sliding rod; 15. Piston; 16. Bushing; 17. Snap ring; 18. Ball bearing; 19. Sealing ring; 20. Adaptor hole; 21. Guide groove; 22. First threaded hole; 23. Threaded ring seat; 24. Second threaded hole; 25. Limiting guide hole; 26. Extrusion block; 27. Clamping rubber; 28. Sealing plug; 29. ​​Guide protrusion. Detailed Implementation

[0019] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example: like Figure 1-8 As shown, this embodiment of the invention provides a device for placing ointment in the external auditory canal, including a drug delivery tube 1, an extrusion head 2, a push rod 5, and a transmission component. In this embodiment, the drug delivery tube 1 has a cylindrical hollow structure, and the interior of the drug delivery tube 1 is an ointment storage cavity for containing the ointment to be pushed into the external auditory canal. A piston 15 is provided inside the drug delivery tube 1, and the piston 15 is in close contact with the inner wall of the drug delivery tube 1, and can reciprocate along the length of the drug delivery tube 1 to push the ointment. A sealing ring 19 is sleeved on the peripheral wall of the piston 15. The sealing ring 19 is made of medical-grade silicone material, which can enhance the sealing between the piston 15 and the inner wall of the drug delivery tube 1, and prevent the ointment from leaking out from the gap between the piston 15 and the drug delivery tube 1. Meanwhile, two guide grooves 21 are provided on the axial side of the piston 15 peripheral wall, and two guide protrusions 29 are provided on the inner wall of the drug delivery tube 1 along the length direction. The guide protrusions 29 and the guide grooves 21 are slidably engaged, which can guide and limit the movement of the piston 15, prevent the piston 15 from rotating during the movement, and ensure the stability of the transmission.

[0021] In this embodiment, the extrusion head 2 is rotatably mounted at one end of the administration tube 1. The end of the extrusion head 2 away from the administration tube 1 is closed, and this closed end is designed with a smooth spherical structure to avoid scratching the mucosa when inserted into the external auditory canal. The extrusion head 2 has a cavity communicating with the inside of the administration tube 1. The cavity is used to temporarily store the ointment pushed from the administration tube 1. The peripheral wall of the extrusion head 2 has extrusion holes 3 communicating with the cavity. There are multiple extrusion holes 3. Each extrusion hole 3 is inclined from the inside of the extrusion head 2 outward in a direction away from the administration tube 1, with an inclination angle of 30 to 45°. The inclined extrusion holes 3 can make the ointment spread outward along the inner wall of the external auditory canal when extruded, increasing the application range. At the same time, the multiple extrusion holes 3 are staggered around the peripheral wall of the extrusion head 2 to achieve uniform distribution of the ointment and avoid local accumulation.

[0022] Furthermore, a bushing 16 is integrally formed at the end of the extruder 2 facing the drug delivery tube 1. The bushing 16 is sleeved and fitted to the end of the drug delivery tube 1. A ring of balls 18 is rolled and embedded between the inner circular surface of the bushing 16 and the outer circular surface of the drug delivery tube 1. Multiple balls 18 are evenly distributed along the circumference of the bushing 16, which can convert the sliding friction between the bushing 16 and the drug delivery tube 1 into rolling friction, reducing the resistance when the extruder 2 rotates and making the operation smoother. A slip ring is embedded in the gap between the bushing 16 and the drug delivery tube 1 to limit the movement of the balls 18. The slip ring adopts a ring structure, and its inner diameter is adapted to the outer diameter of the drug delivery tube 1, and its outer diameter is adapted to the inner diameter of the bushing 16, which can prevent the balls 18 from falling out of the gap. A retaining ring 17 is provided on the outer wall of the administration tube 1 near the bushing 16 to limit the slip ring. The retaining ring 17 adopts a retaining spring structure, which can axially limit the slip ring, prevent the slip ring from shifting during the use of the device, and ensure the installation stability of the ball 18.

[0023] In a preferred embodiment of this invention, the transmission component is used to convert the thrust of the piston 15 moving along the length of the administration tube 1 into the power to drive the extruder head 2 to rotate. In this embodiment, the transmission component is a slide rod 14 that passes through the administration tube 1. There are two slide rods 14, which are arranged in a double helix structure and distributed along the length of the administration tube 1. One end of the two slide rods 14 is fixedly connected to the inner wall of the extruder head 2. The connection method is welding or integral molding to ensure the connection strength and avoid loosening during power transmission. The piston 15 has two adapter holes 20, which are adapted to the double helix structure of the two slide rods 14. The slide rods 14 pass through the adapter holes 20. When the piston 15 moves along the length of the administration tube 1, the inner wall of the adapter hole 20 generates an axial thrust on the slide rods 14. Since the two slide rods 14 are double helix structures, the axial thrust can be decomposed into a torque that drives the slide rods 14 to rotate, thereby driving the extruder head 2 to rotate synchronously. A sealing gasket is provided on the inner wall of the adapter hole 20. The sealing gasket is made of medical rubber material, which can enhance the sealing between the adapter hole 20 and the slide rod 14, and reduce sliding friction.

[0024] In this embodiment, the push rod 5 passes through the end of the administration tube 1 away from the extruder 2, and is used to push and pull the piston 15 to move along the length direction inside the administration tube 1. An end plate 4 is provided at the end of the administration tube 1 away from the extruder 2. A threaded ring seat 23 is provided on the end plate 4 to engage with the threaded end of the administration tube 1. An external thread is formed on the outer wall of the end of the administration tube 1, which matches the internal thread of the threaded ring seat 23. This threaded engagement allows for a detachable connection between the end plate 4 and the administration tube 1, facilitating disassembly, cleaning, and ointment filling of the device. A sealing plug 28 is provided on the side of the end plate 4 facing the administration tube 1. The sealing plug 28 is made of medical-grade silicone, and its size matches the inner diameter of the administration tube 1. The sealing plug 28, when inserted into the administration tube 1, enhances the sealing of the end of the administration tube 1 and prevents ointment leakage.

[0025] Furthermore, a second threaded hole 24 is provided in the middle of the end plate 4. The push rod 5 passes through the second threaded hole 24 and extends into the drug delivery tube 1 to be rotatably connected to the piston 15. The outer wall of the push rod 5 is provided with external threads, which are screwed into the internal threads of the second threaded hole 24. By rotating the push rod 5, the piston 15 can be moved axially to control the amount of medication pushed. A push block 6 is provided at the end of the push rod 5 outside the drug delivery tube 1. The push block 6 is designed with a circular structure, and its diameter is larger than the diameter of the second threaded hole 24, which makes it easy for the operator to hold and rotate. The outer wall of the push block 6 is provided with anti-slip texture to increase the friction between the hand and the push block 6 and prevent slippage during operation. Furthermore, a pair of first protruding handles 10 are symmetrically provided on the side wall of the end plate 4. The first protruding handles 10 are integrally formed with the end plate 4. The operator can fix the end plate 4 by holding the first protruding handles 10, which facilitates the synchronous rotation of the push block 6 to push the ointment and improves the stability of the operation.

[0026] Furthermore, the end plate 4 is also provided with a pressure-applying structure for pressing the push rod 5. The pressure-applying structure includes a pressing rubber 27 and a squeezing block 26. The squeezing block 26 is movably embedded in the mounting groove opened in the end plate 4. The squeezing block 26 can move along the mounting groove toward the second threaded hole 24. The pressing rubber 27 is provided on one end face of the squeezing block 26 toward the second threaded hole 24. The pressing rubber 27 is in contact with the outer wall of the push rod 5. When the squeezing block 26 moves toward the second threaded hole 24, it applies pressure to the push rod 5 in the second threaded hole 24 through the pressing rubber 27, increasing the friction between the push rod 5 and the second threaded hole 24, thereby achieving the damping effect of the push rod 5.

[0027] In a further embodiment, a threaded ring 11 is provided on the outer wall of the administration tube 1 near the extrusion head 2. The threaded ring 11 is integrally formed with the administration tube 1, and its outer wall has external threads. A sleeve 7 is threadedly fitted onto the threaded ring 11. The sleeve 7 has a first threaded hole 22 in the middle that matches the external threads of the threaded ring 11. The end of the sleeve 7 facing the extrusion head 2 is spherical, and a pad 13 is wrapped on the spherical surface. The pad 13 is made of medical sponge material, which is soft and has a certain degree of elasticity, and can fit closely to the auricle, playing a limiting and cushioning role to prevent the device from being inserted too deeply into the ear canal and causing damage. A pair of second protruding handles 12 are symmetrically provided on the top side wall of the sleeve 7, which makes it easy for the operator to rotate the sleeve 7 and adjust the position of the sleeve 7 on the threaded ring 11.

[0028] Furthermore, a rotating disk 8 is horizontally rotatably mounted on the top of the sleeve 7. The rotating disk 8 is connected to the sleeve 7 via a bearing and can rotate freely relative to the sleeve 7. A guide bar 9 is vertically fixed on the rotating disk 8. The guide bar 9 is a cuboid structure. A limiting guide hole 25 is vertically formed on the end plate 4 on the side of the extrusion block 26 away from the second threaded hole 24. The top of the guide bar 9 passes through the limiting guide hole 25 and through the end plate 4. The side of the top of the guide bar 9 facing the second threaded hole 24 is set as an inclined surface. This inclined surface is inclined from bottom to top in the direction away from the second threaded hole 24. The end face of the extrusion block 26 away from the second threaded hole 24 is in contact with the inclined surface of the guide bar 9. When the guide bar 9 moves up and down along the limiting guide hole 25, the inclined surface can generate a lateral thrust on the extrusion block 26, driving the extrusion block 26 to move toward or away from the second threaded hole 24.

[0029] When the device for placing ointment in the external auditory canal of the present invention is in operation, Before use, first unscrew the end plate 4 to fill the storage cavity of the administration tube 1 with ointment, then thread the end plate 4 to the administration tube 1 to ensure that the sealing plug 28 fits tightly against the inner wall of the administration tube 1. Depending on the depth of the patient's external auditory canal, rotate the second convex handle 12 to adjust the position of the sleeve block 7 on the threaded ring platform 11 so that the extrusion head 2 can be inserted into the lesion. At the same time, the pad 13 on the sleeve block 7 abuts against the auricle to limit the position.

[0030] After the ointment is filled, the extruder head 2 is inserted into the patient's external auditory canal, ensuring that the padding 13 on the sleeve 7 fits tightly against the auricle. The sleeve 7 provides axial restraint for the device, preventing the extruder head 2 from penetrating too deeply and damaging the ear canal mucosa. At this time, the operator holds the first protruding handle 10 on the end plate 4 with one hand to secure the entire device, while rotating the push block 6 with the other. Since the push rod 5 is screwed into the second threaded hole 24 on the end plate 4, rotating the push block 6 drives the push rod 5 to move along the length of the administration tube 1 towards the extruder head 2, thereby pushing the piston 15 to move synchronously towards the extruder head 2. During the movement of the piston 15, the guide groove 21 on its peripheral wall slides into the guide protrusion 29 on the inner wall of the administration tube 1, guiding the piston 15, preventing rotation, and ensuring smooth movement of the piston 15 to evenly distribute the ointment. Meanwhile, the adapter hole 20 on the piston 15 cooperates with the slide rod 14 with a double helix structure. When the piston 15 moves toward the extrusion head 2, the inner wall of the adapter hole 20 applies an axial thrust to the slide rod 14. Since the two slide rods 14 are distributed in a double helix, the axial thrust is decomposed into a torque that drives the slide rod 14 to rotate, so that the slide rod 14 drives the extrusion head 2 to rotate synchronously.

[0031] Under the pushing action of piston 15, the ointment in the administration tube 1 enters the cavity of the extruder head 2. As the extruder head 2 rotates, the ointment in the cavity is evenly extruded through multiple staggered inclined extrusion holes 3 on the peripheral wall. The inclined distribution of the extrusion holes 3 causes the ointment to spread outward along the inner wall of the external auditory canal, and the staggered distribution structure ensures that the ointment is evenly covered circumferentially on the inner wall of the ear canal, achieving uniform application.

[0032] When adjusting the position of the sleeve 7, as the sleeve 7 moves along the threaded ring 11, it drives the rotating disk 8 to move synchronously, thereby driving the guide bar 9 to move up and down along the limiting guide hole 25. When the sleeve 7 approaches the extrusion head 2, the distance between the sleeve 7 and the extrusion head 2 decreases, the guide bar 9 moves downward, and the distance between the inclined surface of the guide bar 9 and the alignment position of the second threaded hole 24 increases. The pressure of the rubber 27 against the push rod 5 decreases, and the rotational resistance of the push rod 5 decreases, which is suitable for applying ointment to shallower areas of the external auditory canal. When the sleeve 7 moves away from the extrusion head 2, the length of the extrusion head 2 and the medication tube 1 extending into the ear canal increases, the guide bar 9 moves upward, and the distance between the inclined surface of the guide bar 9 and the alignment position of the second threaded hole 24 decreases. The inclined surface of the guide bar 9 pushes the extrusion block 26 toward the second threaded hole 24, and the pressure of the rubber 27 against the push rod 5 increases. The resistance of the push rod 5 rotating to push the piston 15 increases, which makes it easier for the operator to accurately control the pushing force and avoid the push rod 5 from being easily twisted or shaken due to insufficient torque, thereby preventing excessive extrusion of ointment or damage to the ear canal due to excessive rotation of the extrusion head 2.

[0033] After the ointment is applied, rotate the pusher 6 in the opposite direction to move the pusher 5 and piston 15 away from the extrusion head 2. At this time, the slide bar 14 rotates in the opposite direction under the action of the adapter hole 20, which drives the extrusion head 2 to rotate in the opposite direction, and collects the ointment remaining in the extrusion hole 3 into the cavity to avoid ointment waste and contamination. Then the device can be removed from the external auditory canal.

[0034] Unless otherwise specified, in this invention, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this invention are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0035] Unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A device for placing ointment in the external auditory canal, characterized in that, include: A drug delivery tube (1) is provided with a piston (15) inside the drug delivery tube (1); The extrusion head (2) is rotatably installed at one end of the administration tube (1). The end of the extrusion head (2) away from the administration tube (1) is closed. The interior of the extrusion head (2) has a cavity communicating with the interior of the administration tube (1). An extrusion hole (3) communicating with the cavity is opened on the peripheral wall of the extrusion head (2). A push rod (5) is inserted at the end of the drug delivery tube (1) away from the extruder (2) and is used to push and pull the piston (15) to move along the length direction inside the drug delivery tube (1); A transmission component installed inside the administration tube (1) is used to convert the thrust of the piston (15) moving along the length of the administration tube (1) into the power to drive the extruder (2) to rotate.

2. The device for placing ointment in the external auditory canal according to claim 1, characterized in that: The transmission component is a slide rod (14) inserted inside the drug delivery tube (1). There are two slide rods (14), which are arranged in a double helix structure along the length of the drug delivery tube (1). One end of the two slide rods (14) is fixedly connected to the extrusion head (2). The piston (15) has two adapter holes (20), which are adapted to the double helix structure of the two slide rods (14).

3. The device for placing ointment in the external auditory canal according to claim 1, characterized in that: The extrusion hole (3) has multiple channels. Each extrusion hole (3) is inclined from the inside of the extrusion head (2) outward toward the direction away from the drug delivery tube (1), and the peripheral wall of the extrusion head (2) is misaligned when multiple extrusion holes (3) surround it.

4. The device for placing ointment in the external auditory canal according to claim 1, characterized in that: The extruder (2) is provided with a bushing (16) at one end facing the administration tube (1). The bushing (16) is sleeved with the administration tube (1), and a ball (18) is rolled between the inner surface of the bushing (16) and the outer surface of the administration tube (1). A slip ring is embedded in the gap between the bushing (16) and the administration tube (1) to limit the ball (18). A retaining ring (17) for limiting the slip ring is provided on the outer wall of the administration tube (1) near the bushing (16).

5. The device for placing ointment in the external auditory canal according to claim 1, characterized in that: The end of the drug delivery tube (1) away from the extruder (2) is provided with an end plate (4). The end plate (4) is provided with a threaded ring seat (23) that is threadedly fitted with the drug delivery tube (1). The side of the end plate (4) facing the drug delivery tube (1) is provided with a sealing plug (28). The sealing plug (28) is inserted into the drug delivery tube (1). The middle part of the end plate (4) is provided with a second threaded hole (24). The push rod (5) passes through the second threaded hole (24) and extends into the drug delivery tube (1) and is rotatably connected to the piston (15). The push rod (5) is screwed with the second threaded hole (24). The end of the push rod (5) located outside the drug delivery tube (1) is provided with a push block (6). A pair of first protruding shanks (10) are symmetrically provided on the side wall of the end plate (4). The end plate (4) is also provided with a pressure structure for pressing the push rod (5).

6. The device for placing ointment in the external auditory canal according to claim 5, characterized in that: The pressure-applying structure includes a pressing rubber (27) and a squeezing block (26). The squeezing block (26) is movably embedded in the end plate (4) and can move toward the second threaded hole (24). The squeezing block (26) is provided with a pressing rubber (27) on one end face facing the second threaded hole (24). The squeezing block (26) moves toward the second threaded hole (24) and applies pressure to the push rod (5) in the second threaded hole (24) through the pressing rubber (27).

7. The device for placing ointment in the external auditory canal according to claim 6, characterized in that: A threaded ring platform (11) is provided on the outer wall of the drug delivery tube (1) near the extrusion head (2). A sleeve block (7) is threaded on the threaded ring platform (11). The end of the sleeve block (7) facing the extrusion head (2) is set as a spherical surface, and a pad (13) is wrapped on the spherical surface. A pair of second protruding handles (12) are symmetrically arranged on the top side wall of the sleeve block (7).

8. The device for placing ointment in the external auditory canal according to claim 7, characterized in that: The top of the sleeve block (7) is horizontally rotatably equipped with a rotating disk (8), and a guide bar (9) is vertically fixed on the rotating disk (8). A limiting guide hole (25) is vertically opened on the end plate (4) on the side of the extrusion block (26) away from the second threaded hole (24). The top of the guide bar (9) passes through the limiting guide hole (25) and penetrates the end plate (4). The side of the top of the guide bar (9) facing the second threaded hole (24) is set as an inclined surface. This inclined surface is inclined from bottom to top in the direction away from the second threaded hole (24). The end face of the extrusion block (26) away from the second threaded hole (24) is in contact with the inclined surface of the guide bar (9).

9. A device for placing ointment in the external auditory canal according to claim 1, characterized in that: A sealing ring (19) is fitted on the peripheral wall of the piston (15), and a guide groove (21) is provided on the peripheral wall of the piston (15) along the axial direction. A guide protrusion (29) is provided on the inner wall of the administration tube (1) along the length direction. The guide protrusion (29) and the guide groove (21) are slidably fitted together. Sealing gaskets are provided on the inner wall of the adapter hole (20) and the guide groove (21).

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