A tympanic membrane puncture injection device

Abstract

The application discloses a tympanic membrane puncture injection device, and relates to the technical field of ear-nose-throat medical instruments, which comprises an injection piston cylinder, a piston column which is adaptively arranged in the inner cavity of the injection piston cylinder, and a connecting part which is communicated with the lower end of the injection piston cylinder, and the upper end of the injection piston cylinder is symmetrically provided with an extension part on both sides, wherein a needle cap is adaptively connected on the connecting part of the lower end of the injection piston cylinder, so that the situation that the needle cap is loose or falls off during puncture or injection is avoided, the stability and safety of the operation of medical staff are improved, the puncture accuracy is improved, the secondary suction risk of the medical staff when the needle is taken out from the ear canal of the patient is avoided, abnormal drug delivery or other unnecessary harm caused by secondary suction is avoided, meanwhile, the piston column can be kept in a locked fixed state after injection, unnecessary operation or misoperation is prevented, the safety of the operation of the tympanic membrane puncture link is improved, and the potential medical accident risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of ENT medical device technology, specifically a tympanic membrane puncture and injection device. Background Technology

[0002] The existing "tympanic membrane puncture and injection device" is a medical device used to puncture the tympanic membrane and inject drugs or other therapeutic substances through the puncture point;

[0003] This device typically consists of the following parts:

[0004] ① Puncture needle: It has sufficient sharpness and length to puncture the tympanic membrane.

[0005] ② Outer tube: Used to fix the puncture needle.

[0006] ③ Syringe connection port: Connects to the puncture needle and is used to deliver drugs or therapeutic substances.

[0007] ④ Control handle: Used to operate and control the puncture process to ensure accurate puncture location and depth.

[0008] Tympanic membrane puncture and injection devices are typically used by medical personnel in a healthcare setting to treat tympanic membrane-related conditions such as otitis media and tympanic membrane effusion.

[0009] However, existing injection devices for tympanic membrane puncture still have the following drawbacks after practical use:

[0010] Existing injection devices for tympanic membrane puncture lack the function of automatically locking the piston in the syringe. This can easily lead to the risk of medical staff misoperating or accidentally contacting the piston when removing the needle from the patient's ear canal after the injection is completed, resulting in the risk of secondary aspiration of the syringe.

[0011] Furthermore, in current clinical practice, most injection devices require manual control of the injection or puncture angle by medical personnel. Existing syringes lack specialized structures or designs to ensure that the syringe remains stable during injection, which can easily lead to poor safety and stability of the injection device used for tympanic membrane puncture. This can result in deviations in the puncture point of tympanic membrane puncture, affecting the safe conduct of the tympanic membrane puncture procedure.

[0012] Therefore, the present invention proposes a tympanic membrane puncture and injection device to make up for and improve the deficiencies of the prior art. Summary of the Invention

[0013] In view of the deficiencies of the existing technology, the present invention provides a tympanic membrane puncture and injection device, which can effectively solve the related technical problems mentioned in the background art.

[0014] To achieve the above objectives, the present invention provides the following technical solution:

[0015] This invention discloses a tympanic membrane puncture injection device, including an injection piston cylinder and a piston rod adapted to be disposed in the inner cavity of the injection piston cylinder, and a connecting part communicating with the lower end of the injection piston cylinder. The upper end of the injection piston cylinder is symmetrically provided with extensions on both sides. A needle cap is adapted to be connected to the connecting part at the lower end of the injection piston cylinder. The connecting part of the needle cap adapted to the lower end of the injection piston cylinder is frustoconical, and the lower end of the needle cap is connected to a puncture needle.

[0016] The injection piston cylinder is provided with an anti-aspiration self-locking mechanism and a secondary fastening needle mechanism on both sides, and an auxiliary stabilizing mechanism is provided below the injection piston cylinder.

[0017] The anti-aspiration self-locking mechanism includes two handles symmetrically fixedly connected to the bottom surface of the upper end of the piston rod. A limiting shaft is fixedly connected to the lower end of one of the handles. The limiting shaft is slidably connected to the extension of the upper end of the injection piston cylinder. A insertion shaft is fixedly connected to the lower end of the limiting shaft, and a central locking pin is fixedly connected to the lower end of the insertion shaft. An outer chamber is fitted onto the lower end of the insertion shaft. A side plate is fixedly connected to the upper surface of the outer chamber near the injection piston cylinder. The outer chamber is made entirely of non-magnetic material. An inner chamber is fixedly connected inside the outer chamber, and a metal... The outer compartment, inner compartment, and metal compartment are all provided with through holes in their centers. The insert shaft and the central locking pin are inserted into the through holes. The upper part of the metal compartment is slidably connected to a locking ball through an opening. The outer wall of the central locking pin and the locking ball is provided with a concave arc surface, which can be fitted with the locking ball. A return spring is fixedly connected to the lower inner wall of the metal compartment. The return spring is initially in a compressed state. The lower end of the return spring is fixedly connected to the bottom inner wall of the outer compartment. A magnetic chuck is attached to the bottom surface of the outer compartment. A bent rod is fixedly connected to one side of the outer wall of the magnetic chuck.

[0018] A locking component is provided at the upper end of the bent rod;

[0019] The locking assembly includes a perforated horizontal plate fixedly connected to the upper end face of the outer cabin, with a receiving cavity at the end of the perforated horizontal plate away from the outer cabin. The upper end of the bent rod is rotatably connected to the receiving cavity of the perforated horizontal plate. A ratchet disc is fixedly connected to the end of the bent rod that passes through the receiving cavity of the perforated horizontal plate. A torsion spring pawl engages on one side of the ratchet disc. The torsion spring pawl is rotatably connected to the inner wall of the receiving cavity of the perforated horizontal plate. A transition shaft is coaxially fixedly connected to the upper end face of the ratchet disc. A reversing shaft is fixedly connected to the upper end of the transition shaft. A combination groove is formed on the outer circumference of the reversing shaft. The combination groove consists of a lower spiral groove and an upper vertical groove, and the spiral groove and the vertical groove are interconnected. A rod-driven sliding ring is fitted on the lower outer circumference of the reversing shaft. The end of the rod-driven sliding ring away from the reversing shaft is fixedly connected to the outer wall of the insertion shaft. The rod-driven sliding ring is slidably connected to the inner wall of the combination groove through a guide slider provided inside it.

[0020] Preferably, both handles are arc-shaped, and the outer surface of each handle is covered with a soft rubber layer. The use of two arc-shaped handles, each covered with a soft rubber pad, makes it easier for medical personnel to hold the piston rod.

[0021] Preferably, both the inner cabin and the metal cabin are composed of an upper cone and a lower cylinder, and the metal cabin is made of a magnetic metal material.

[0022] Preferably, the inner walls of the combined grooves are all smoothed, and the length of the spiral groove portion in the combined grooves is sufficient to allow the reversing shaft to rotate 90 degrees.

[0023] Preferably, a receiving hole is provided on the inner wall of the sliding ring with rod at a position corresponding to the guide slider. A spring is fixedly connected inside the receiving hole on the inner wall of the sliding ring with rod, and the end of the spring away from the receiving hole is fixedly connected to the outer wall of the guide slider.

[0024] Preferably, the diameter of the receiving hole on the inner wall of the sliding ring with rod is adapted to the outer diameter of the guide slider, and the guide slider is spherical in shape.

[0025] Preferably, the auxiliary stabilizing mechanism includes two side grooves formed on the circumferential surface of the injection piston cylinder. The two side grooves are symmetrically distributed on the circumferential surface of the injection piston cylinder. The inner wall of one of the two side grooves is slidably connected to a second side plate, and the inner wall of the other side groove of the second side plate is slidably connected to a first side plate. An extension plate is fixedly connected to the lower end of the second side plate. A T-shaped groove is formed below the extension plate. A back groove is formed on the surface of the extension plate near the needle cap. A primary support is fixedly connected to one outer wall of the second side plate and the first side plate. A secondary support is fixedly connected to the lower end of the primary support. A contour plate is fixedly connected to the lower end of the secondary support. Two support balls are fixedly connected to the bottom surface of the contour plate. The contour plate is generally semi-circular. The two support balls are both hemispherical and of different sizes.

[0026] Preferably, the contour plate is made of a deformable material with memory, and both support balls are made of rubber.

[0027] Preferably, the secondary fastening needle mechanism includes a second limiting shaft fixedly connected to the lower end of one of the two handles. The second limiting shaft is slidably connected to the extension portion at the upper end of the injection piston cylinder. A ball-head rod is fixedly connected to the lower end of the second limiting shaft. The lower end of the ball-head rod, away from the second limiting shaft, is spherical. An assisting block is attached to the spherical end face of the ball-head rod. The assisting block is slidably connected to a top block fixedly connected to its upper end face within a T-groove below the extension plate. The surface of the assisting block near the spherical end face of the ball-head rod is inclined. The surface of the first assist block away from the first ball head rod is slidably connected to a paddle via a sliding groove and a slider. The outer wall of the needle cap is fitted with a ring plate. One side of the outer wall of the ring plate is slidably connected to the back groove of the extension plate via an inclined block. The bottom surface of the ring plate is higher than the top surface of the paddle. The bottom surface of the paddle is fixedly connected to the second assist block. The surface of the second assist block near the needle cap is inclined. The inclined side of the second assist block is attached to the second ball head rod. The upper end of the second ball head rod is fixedly connected to the outer wall of the extension plate. The end of the second ball head rod that is attached to the second assist block is spherical.

[0028] Compared with known public technologies, the technical solution provided by this invention has the following beneficial effects:

[0029] This invention indirectly achieves automatic locking of the piston column by using a locking ball and a central locking column, avoiding the situation where medical staff accidentally touch the piston column and cause secondary aspiration when withdrawing the injection piston and puncture needle from the patient's ear canal. This ensures that the syringe will not aspirate again after injection, avoiding the risk of secondary aspiration when medical staff remove the needle from the patient's ear canal, preventing abnormal drug delivery or other unnecessary harm caused by secondary aspiration. At the same time, the piston column can remain locked and fixed after injection, preventing unnecessary operation or misoperation, which helps to improve the safety of the tympanic membrane puncture procedure and reduce the potential risk of medical accidents.

[0030] On the other hand, by automatically locking the piston rod inside the injection piston cylinder, the reuse of injection piston cylinders that have not been properly sterilized can be prevented, thereby reducing the risk of cross-infection. At the same time, it can also prevent the injection device from being disassembled or improperly disposed of by others, thus ensuring that medical waste is disposed of in accordance with regulations and facilitating the proper disposal of the injection piston cylinder as medical waste in the future, avoiding potential risks to the environment and public health.

[0031] By using the action of medical staff lifting the piston column to draw up the medical medication, and then using the ring plate to lift and tighten the needle cap a second time, it can be further ensured that the needle cap is firmly fixed to the connection part at the lower end of the injection piston cylinder. This prevents the needle cap from loosening or falling off during puncture or injection, thereby improving the stability and safety of medical staff's operation and reducing the risk of accidents. At the same time, tightening the needle cap a second time can reduce the risk of shaking and vibration during the use of the needle cap, which helps to improve the accuracy of puncture.

[0032] By flexibly adjusting the puncture angle, medical staff can more accurately puncture the patient's target area. This not only reduces the time and difficulty of the procedure but also maintains the stability of the puncture angle by using a secondary stent and contour plate made of shape-memory material. This ensures that the operator maintains the required angle throughout the puncture process, improving the stability of the operation and reducing angle changes caused by unstable hands or operational errors, thus further ensuring the safety of the puncture procedure. Attached Figure Description

[0033] The invention is further described with reference to embodiments illustrated in the following figures, wherein:

[0034] Figure 1 This is a front-view perspective structural diagram of the present invention;

[0035] Figure 2 This is a bottom-view perspective structural diagram of the present invention;

[0036] Figure 3This is a partial top-view perspective view of a portion of the side plate in this invention;

[0037] Figure 4 This is a partial three-dimensional structural diagram of the outer cabin in this invention;

[0038] Figure 5 This is a partial three-dimensional structural diagram of the interior of the outer cabin and the inner cabin in this invention;

[0039] Figure 6 This is a partial three-dimensional structural diagram of the interior of the cabin in this invention;

[0040] Figure 7 This is a front view of the interior structure of the cabin in this invention;

[0041] Figure 8 For the present invention Figure 1 A magnified 3D structural diagram of a portion of point A in the middle;

[0042] Figure 9 This is a partial three-dimensional structural diagram of the perforated horizontal plate and ratchet disc in this invention;

[0043] Figure 10 This is a partial three-dimensional structural diagram of the guide slider in this invention;

[0044] Figure 11 This is a three-dimensional structural diagram showing the partial connection relationship between the guide slider and the rod-mounted sliding ring in this invention;

[0045] Figure 12 This is a partial three-dimensional structural diagram of the reversing shaft and the combined groove in this invention;

[0046] Figure 13 For the present invention Figure 1 A magnified 3D structural diagram of a portion of point B in the middle;

[0047] Figure 14 This is a schematic diagram showing the partial connection relationship between ball joint one and ball joint two in this invention;

[0048] Figure 15 This is a partial three-dimensional structural diagram showing the connection relationship between the paddle and the assist block in this invention.

[0049] The labels in the diagram represent:

[0050] 1. Injection piston cylinder; 11. Piston rod; 12. Needle cap; 13. Puncture needle;

[0051] 21. Handle; 22. Limiting shaft 1; 23. Insert shaft; 24. Side plate 1; 25. Outer compartment; 26. Inner compartment; 27. Metal compartment; 28. Locking ball; 2801. Center locking pin; 29. ​​Return spring; 210. Magnetic chuck; 211. Bent rod;

[0052] 2301. Perforated cross plate; 2302. Ratchet disc; 2303. Torsion spring pawl; 2304. Transition shaft; 2305. Reversing shaft; 2306. Combination groove; 2307. Sliding ring with rod; 2308. Guide slider; 2309. Spring;

[0053] 31. Side groove; 32. Side plate two; 33. Extension plate; 34. Primary support; 35. Secondary support; 36. Contouring plate; 37. Support ball;

[0054] 41. Limiting shaft two; 42. Ball head rod one; 43. Assisting block one; 44. Top block; 45. Paddle; 46. Ring plate; 47. Assisting block two; 48. Ball head rod two. Detailed Implementation

[0055] refer to Figures 1 to 15 As shown:

[0056] A tympanic membrane puncture injection device includes an injection piston cylinder 1 and a piston rod 11 adapted to be disposed in the inner cavity of the injection piston cylinder 1, and a connecting part communicating with the lower end of the injection piston cylinder 1. The upper end of the injection piston cylinder 1 has symmetrical extensions on both sides. A needle cap 12 is adapted to be connected to the connecting part at the lower end of the injection piston cylinder 1. The needle cap 12 is adapted to the connecting part at the lower end of the injection piston cylinder 1 in the shape of a frustum, and the lower end of the needle cap 12 is connected to a puncture needle 13.

[0057] The injection piston cylinder 1 is equipped with an anti-aspiration self-locking mechanism and a secondary fastening needle mechanism on both sides, and an auxiliary stabilizing mechanism is provided below the injection piston cylinder 1.

[0058] The anti-aspiration self-locking mechanism includes two handles 21 symmetrically fixedly connected to the bottom surface of the upper end of the piston cylinder 11. A limiting shaft 22 is fixedly connected to the lower end of one of the handles 21. The limiting shaft 22 is slidably connected to the extension of the upper end of the injection piston cylinder 1. A insertion shaft 23 is fixedly connected to the lower end of the limiting shaft 22. A central locking pin 2801 is fixedly connected to the lower end of the insertion shaft 23. An outer chamber 25 is fitted onto the lower end of the insertion shaft 23. A side plate 24 is fixedly connected to the upper surface of the outer chamber 25 near the injection piston cylinder 1. The outer chamber 25 is made entirely of non-magnetic material. An inner chamber 26 is fixedly connected inside the outer chamber 25. A metal chamber 27 is slidably connected inside the inner chamber 26. The outer compartment 25, the inner compartment 26, and the metal compartment 27 are all provided with through holes. The insertion shaft 23 and the central locking pin 2801 are inserted into the through holes. The upper part of the metal compartment 27 is slidably connected to the locking ball 28 through the opening. The outer wall of the central locking pin 2801 and the locking ball 28 is provided with a concave arc surface, and the arc surface can be fitted with the locking ball 28. The lower inner wall of the metal compartment 27 is fixedly connected to the return spring 29. The return spring 29 is initially in a compressed state. The lower end of the return spring 29 is fixedly connected to the bottom inner wall of the outer compartment 25. The bottom surface of the outer compartment 25 is attached to the magnetic chuck 210. A bent rod 211 is fixedly connected to one side of the outer wall of the magnetic chuck 210.

[0059] A locking component is provided at the upper end of the bent rod 211;

[0060] The locking assembly includes a perforated horizontal plate 2301 fixedly connected to the upper end face of the outer compartment 25, with a receiving cavity at the end of the perforated horizontal plate 2301 away from the outer compartment 25. The upper end of a bent rod 211 is rotatably connected through the receiving cavity of the perforated horizontal plate 2301. A ratchet disc 2302 is fixedly connected to the end of the bent rod 211 that passes through the receiving cavity of the perforated horizontal plate 2301. A torsion spring pawl 2303 engages on one side of the ratchet disc 2302. The torsion spring pawl 2303 is rotatably connected to the inner wall of the receiving cavity of the perforated horizontal plate 2301. A transition shaft is coaxially fixedly connected to the upper end face of the ratchet disc 2302. 2304, the upper end of the transition shaft 2304 is fixedly connected to the reversing shaft 2305, and the outer circumferential surface of the reversing shaft 2305 is provided with a combination groove 2306. The combination groove 2306 is composed of a lower spiral groove and an upper vertical groove, and the spiral groove and the vertical groove are interconnected. A rod sliding ring 2307 is sleeved on the lower outer circumferential surface of the reversing shaft 2305. The end of the rod sliding ring 2307 away from the reversing shaft 2305 is fixedly connected to the outer wall of the insert shaft 23. The rod sliding ring 2307 is slidably connected to the inner wall of the combination groove 2306 through the guide slider 2308 provided inside it.

[0061] Both handles 21 are arc-shaped, and the outer surface of each handle 21 is covered with a soft rubber layer. The use of two arc-shaped handles 21, with their surfaces covered with soft rubber pads, makes it easier for medical personnel to hold the piston rod 11.

[0062] Both the inner compartment 26 and the metal compartment 27 are composed of an upper cone and a lower cylinder, with the metal compartment 27 made of magnetic metal.

[0063] The inner walls of the combination groove 2306 are all smoothed, and the length of the spiral groove in the combination groove 2306 allows the reversing shaft 2305 to rotate 90 degrees.

[0064] A receiving hole is provided on the inner wall of the rod sliding ring 2307 at a position corresponding to the guide slider 2308. A spring 2309 is fixedly connected inside the receiving hole on the inner wall of the rod sliding ring 2307. The end of the spring 2309 away from the receiving hole is fixedly connected to the outer wall of the guide slider 2308.

[0065] The diameter of the receiving hole on the inner wall of the rod sliding ring 2307 is adapted to the outer diameter of the guide slider 2308, and the guide slider 2308 is spherical in shape.

[0066] The auxiliary stabilizing mechanism includes two side grooves 31 formed on the circumferential surface of the injection piston cylinder 1. The two side grooves 31 are symmetrically distributed on the circumferential surface of the injection piston cylinder 1. The inner wall of one side groove 31 is slidably connected to a second side plate 32. The inner wall of the other side groove 31 is slidably connected to a first side plate 24. An extension plate 33 is fixedly connected to the lower end of the second side plate 32. A T-shaped groove is formed below the extension plate 33. A back groove is formed on the surface of the extension plate 33 near the needle cap 12. A primary support 34 is fixedly connected to the outer wall of the second side plate 32 and the first side plate 24. A secondary support 35 is fixedly connected to the lower end of the primary support 34. A contour plate 36 is fixedly connected to the lower end of the secondary support 35. Two support balls 37 are fixedly connected to the bottom surface of the contour plate 36. The contour plate 36 is in the shape of a semi-circular ring. The two support balls 37 are both hemispherical and of different sizes.

[0067] The contour plate 36 is made of a shape-memory deformable material, and both support balls 37 are made of rubber.

[0068] The secondary fastening needle mechanism includes a limiting shaft 41 fixedly connected to the lower end of one of the two handles 21. The limiting shaft 41 is slidably connected to the extension of the upper end of the injection piston cylinder 1. A ball-head rod 42 is fixedly connected to the lower end of the limiting shaft 41. The lower end of the ball-head rod 42, away from the limiting shaft 41, is spherical. An assisting block 43 is attached to the spherical end face of the ball-head rod 42. The assisting block 43 is slidably connected to the T-groove below the extension plate 33 through a top block 44 fixedly connected to its upper end face. The surface of the assisting block 43 near the spherical side of the ball-head rod 42 is inclined. A lever 45 is slidably connected to the side of the ball head rod 42 away from the ball head rod 42 via a sliding groove and a slider. A ring plate 46 is fitted on the outer wall of the needle cap 12. One side of the outer wall of the ring plate 46 is slidably connected to the back groove of the extension plate 33 via an inclined block. The bottom surface of the ring plate 46 is higher than the top surface of the lever 45. An assist block 47 is fixedly connected to the bottom surface of the lever 45. The surface of the assist block 47 near the needle cap 12 is inclined. A ball head rod 48 is attached to the inclined side of the assist block 47. The upper end of the ball head rod 48 is fixedly connected to the outer wall of the extension plate 33. The end of the ball head rod 48 that is attached to the assist block 47 is spherical.

[0069] Initial limitations:

[0070] The piston rod 11 is located at the lowest end inside the injection piston cylinder 1, that is, the piston rod 11 has not been removed from the inside of the injection piston cylinder 1. The metal chamber 27 is under the magnetic attraction of the magnetic chuck 210, and the locking ball 28 is engaged in the movable hole. At this time, the reset spring 29 is in a compressed state, the lowest end of the puncture needle 13 is three fingers away from the contour plate 36, the spring 2309 is in a natural state, and the guide slider 2308 is inside the combination groove 2306 and not in the receiving hole.

[0071] When using:

[0072] Medical fluid extraction steps:

[0073] First, medical personnel can manually insert the needle cap 12 into the connecting part at the lower end of the injection piston cylinder 1, and keep the annular plate 46 on the outer wall of the needle cap 12 in contact with the upper end face of the lever 45, i.e. Figure 1 and Figure 2 , Figure 13 As shown, at this time, the inner cavity of the injection piston cylinder 1 forms a connected cavity with the needle cap 12 and the puncture needle 13. Then, the medical staff holds the upper end of the piston column 11 and inserts the lower end of the puncture needle 13 into the medical liquid to be injected. The medical staff can then manually lift the piston column 11 to gradually draw the medical liquid into the interior of the injection piston cylinder 1. During this process, as the medical staff lifts the piston column 11 and moves it upward, it will simultaneously drive the handle 21, the first limiting shaft 22, the insertion shaft 23, the central locking column 2801, and the second limiting shaft 41 to move upward.

[0074] At this time, as the insert shaft 23 moves upward, it is fixedly connected to the sliding ring 2307 with a rod. The sliding ring 2307 is slidably connected to the inner wall of the combination groove 2306 via the guide slider 2308. Furthermore, the length of the spiral groove in the combination groove 2306 allows the reversing shaft 2305 to rotate 90 degrees. Therefore, as the insert shaft 23 drives the sliding ring 2307 to move upward synchronously, it will gradually drive the reversing shaft 2305 to rotate clockwise. (See reference for details.) Figure 8 and Figure 9 As shown, simultaneously, as the insertion shaft 23 moves upward, the concave arc surfaces on both sides of the central locking pin 2801 gradually move upward away from the locking ball 28. As the sliding ring 2307 continues to move upward, it will eventually cause the reversing shaft 2305 to rotate 90 degrees clockwise. After that, the guide slider 2308 will move vertically upward along the vertical groove trajectory in the combination groove 2306. During this process, the reversing shaft 2305 will no longer rotate, and eventually the guide slider 2308 will completely leave the interior of the vertical groove. This is the process of medical personnel extracting medical liquid.

[0075] As the reversing shaft 2305 rotates 90 degrees, the transition shaft 2304, ratchet disc 2302, bent rod 211, and magnetic chuck 210 located below it will all rotate synchronously. Figure 9 As shown, when the ratchet disk 2302 rotates clockwise, the torsion spring pawl 2303 will not restrict its rotation. The ratchet disk 2302 will be unable to rotate in the opposite direction due to the blocking effect of the torsion spring pawl 2303, thus ensuring that the magnetic chuck 210 cannot rotate in the opposite direction to reset.

[0076] After the magnetic chuck 210 rotates 90 degrees, it can no longer hold the metal compartment 27 and the return spring 29 by magnetic attraction. Therefore, the metal compartment 27 will move upwards under the rebound force of the return spring 29. (See details...) Figure 7 As shown, as the metal compartment 27 moves upward, the locking ball 28 will move upward simultaneously. Since the upper parts of both the inner compartment 26 and the metal compartment 27 are conical, as the locking ball 28 moves upward, it will gradually come into contact with the conical inner wall of the upper part of the inner compartment 26. At this time, under the obstruction of the conical inner wall of the upper part of the inner compartment 26, the locking ball 28 will gradually move closer to the central through hole of the metal compartment 27 and gradually move away from the movable hole of the upper part of the metal compartment 27.

[0077] Therefore, the movement of the locking ball 28 mentioned above provides the conditions for the subsequent self-locking steps to prevent aspiration.

[0078] Secondary needle tightening steps:

[0079] During the process of medical staff drawing up medical medication, if the needle cap 12 is not tightly inserted;

[0080] At this point, as the medical staff gradually lifts the piston rod 11 upwards in the aforementioned steps, it causes the second limiting shaft 41 to move upwards simultaneously. The second limiting shaft 41 then drives the ball joint rod 42 upwards. As the ball joint rod 42 moves upwards, the spherical part of the ball joint rod 42 gradually contacts and compresses the inclined surface of the assist block 43, as can be seen in detail... Figures 13 to 15 As shown, under the guidance of the inclined surface of the first assist block 43, the first assist block 43, the top block 44, and the paddle 45 will slide horizontally along the trajectory of the T-groove towards the side closer to the needle cap 12. As the paddle 45 slides horizontally, the upper surface of the paddle 45 will come close to the bottom surface of the ring plate 46, which will cause the inclined surface of the second assist block 47 to gradually contact and squeeze the spherical part of the ball head rod 48, thereby causing the paddle 45 to gradually move upward. Since the part of the connection between the needle cap 12 and the lower end of the injection piston cylinder 1 is frustoconical, the ring plate 46 will move upward as the paddle 45 moves upward. Since the ring plate 46 is sleeved on the outer wall of the needle cap 12, the friction between the inner wall of the ring plate 46 and the outer wall of the needle cap 12 will give the needle cap 12 an external force to move upward again.

[0081] By using the action of medical staff lifting the piston column 11 to draw up the medical medication, and by using the ring plate 46 to lift and tighten the needle cap 12 a second time, it is possible to further ensure that the needle cap 12 and the puncture needle 13 are firmly fixed to the connection part at the lower end of the injection piston cylinder 1. This prevents the needle cap 12 from loosening or falling off during puncture or injection, thereby improving the stability and safety of the operation of medical staff and reducing the risk of accidents. At the same time, by tightening the needle cap 12 a second time, the risk of shaking and vibration during the use of the needle cap 12 can be reduced, which helps to improve the accuracy of puncture.

[0082] Puncture and injection assisted stabilization steps:

[0083] As described above: After the medical staff has finished drawing the medical medication, they can then prepare to perform tympanic membrane puncture injection on the patient. Before the injection, the medical staff needs to instruct the patient to maintain a stable side-lying position. Then, the prosthetic plate 36 is placed close to the skin of the patient's ear. At this time, the medical staff can use the secondary support 35, which is made of a deformable material with memory, and the prosthetic plate 36. By manually applying external force to the secondary support 35 and the prosthetic plate 36, the prosthetic plate 36 and the rubber support ball 37 can be made to fit against the skin around the patient's ear. On the other hand, the secondary support 35 can be deformed, allowing the medical staff to freely adjust the puncture angle during injection. After adjusting the injection angle, the puncture angle can be better maintained. Then, the medical staff can hold the injection piston cylinder 1 and allow the puncture needle 13 to gradually enter the patient's ear canal to begin tympanic membrane puncture injection.

[0084] By flexibly adjusting the puncture angle, medical staff can more accurately puncture the patient's target area. This not only reduces the time and difficulty of the procedure but also maintains the stability of the puncture angle using the memory deformable secondary stent 35 and the contour plate 36. This ensures that the operator maintains the required angle throughout the puncture process, improving the stability of the operation and reducing angle changes caused by unstable hand movements or operational errors, thus further ensuring the safety of the puncture procedure.

[0085] Self-locking steps to prevent aspiration:

[0086] As the medical staff performs the puncture and injection, the piston rod 11 remains in a downward position. Simultaneously, the piston rod 11 drives the handle 21, the limiting shaft 22, and the central locking pin 2801 to move downwards until the insertion shaft 23 and the central locking pin 2801 are gradually inserted back into the through hole. During the insertion of the insertion shaft 23, the guide slider 2308 contacts the outer wall of the outer compartment 25. (Specific details can be found in...) Figure 8 , Figure 10 and Figure 11 As shown, after the guide slider 2308 comes into contact with the outer wall of the outer compartment 25 and is subjected to force, the spherical surface of the guide slider 2308 and the squeezing force against the outer wall of the outer compartment 25 will cause the guide slider 2308 to compress the spring 2309 and move towards the inside of the receiving hole. Finally, the guide slider 2308 will completely enter the receiving hole, thereby ensuring that when the piston column 11 moves down for injection, it can drive the insert shaft 23 and the rod sliding ring 2307 to move down and reset smoothly.

[0087] As the central locking pin 2801 gradually moves downward, the locking balls 28 are all positioned near the through hole, and the distance between the locking balls 28 is less than the outer diameter of the central locking pin 2801. Therefore, as the central locking pin 2801 moves downward, it gradually contacts and presses against the outer wall of the locking balls 28. The locking balls 28 then move towards the movable hole under force, eventually contacting the inner wall of the upper conical part of the inner compartment 26. At this point, the locking balls 28 press against the inner wall of the upper conical part of the inner compartment 26, causing the locking balls 28 to move the metal compartment 27 downward along the inner wall of the inner compartment 26, and pressing the return spring 29 in the process. As the metal compartment 27 gradually moves downward, the distance between the outer wall of the metal compartment 27 and the inner wall of the inner compartment 26 gradually increases. Therefore, the locking balls 28 gradually stop contacting the inner wall of the inner compartment 26. At this point, the locking balls 28 slide towards the through hole under the action of gravity. Meanwhile, the central locking pin... The concave arc surfaces on both sides of 2801 are precisely between the locking balls 28. As the locking balls 28 slide down, they will fit against the concave arc surfaces. At this time, the medical staff controls the piston column 11 to return to its initial state, that is, the injection of the medicine is completed. At this time, the central locking column 2801 will no longer move down. At this time, the reset spring 29 is no longer under the pressure of the downward movement of the metal chamber 27. Under the rebound force of the reset spring 29, the metal chamber 27 and the locking balls 28 will gradually move upward. As the metal chamber 27 and the locking balls 28 gradually move upward, the distance between the outer wall of the upper conical part of the metal chamber 27 and the inner wall of the upper conical part of the inner chamber 26 gradually decreases. This will squeeze the locking balls 28, causing the locking balls 28 to fit tightly against the concave arc surfaces on both sides of the central locking column 2801, thus completing the automatic locking. At this time, the metal chamber 27 is no longer under the action of magnetic attraction and cannot move down again.

[0088] In this way, on the one hand, after the medical staff finishes injecting the patient, the piston column 11 can be automatically locked indirectly by the locking ball 28 and the central locking column 2801. This avoids the situation where the medical staff accidentally touches the piston column 11 and causes secondary aspiration when withdrawing the injection piston cylinder 1 and the puncture needle 13 from the patient's ear canal. This ensures that the syringe will not aspirate again after the injection is completed, avoiding the risk of secondary aspiration when the medical staff removes the needle from the patient's ear canal. It also prevents secondary aspiration from causing abnormal drug delivery or other unnecessary damage. At the same time, the piston column 11 can remain locked and fixed after the injection is completed, preventing unnecessary operation or misoperation. This helps to improve the safety of the tympanic membrane puncture procedure and reduce the potential risk of medical accidents.

[0089] On the other hand, by automatically locking the piston rod 11 inside the injection piston cylinder 1, the reuse of the injection piston cylinder 1 without proper sterilization can be prevented, thereby reducing the risk of cross-infection. At the same time, it can also prevent the injection device from being disassembled or improperly disposed of by others, thus ensuring that medical waste is disposed of in accordance with regulations. This facilitates the proper disposal of the injection piston cylinder 1 as medical waste in the future, avoiding potential risks to the environment and public health.

Claims

1. A tympanic membrane puncture injection device, comprising an injection piston cylinder (1) and a piston rod (11) adapted to be disposed in the inner cavity of the injection piston cylinder (1), and a connecting part connected to the lower end of the injection piston cylinder (1), wherein extensions are symmetrically arranged on both sides of the upper end of the injection piston cylinder (1), wherein a needle cap (12) is adapted to be connected to the connecting part at the lower end of the injection piston cylinder (1), the connecting part of the needle cap (12) adapted to the lower end of the injection piston cylinder (1) is frustoconical, and a puncture needle (13) is connected to the lower end of the needle cap (12). Its features are: The injection piston cylinder (1) is provided with an anti-aspiration self-locking mechanism and a secondary fastening needle mechanism on both sides, and an auxiliary stabilizing mechanism is provided below the injection piston cylinder (1). The anti-aspiration self-locking mechanism includes two handles (21) symmetrically fixedly connected to the bottom surface of the upper end of the piston rod (11). The lower end of one of the handles (21) is fixedly connected to a limiting shaft (22). The limiting shaft (22) is slidably connected to the extension of the upper end of the injection piston cylinder (1). The lower end of the limiting shaft (22) is fixedly connected to an insert shaft (23). The lower end of the insert shaft (23) is fixedly connected to a central locking pin (2801). The lower end of the insert shaft (23) is fitted with an outer chamber (25). A side plate (24) is fixedly connected to the side of the upper surface of the outer chamber (25) near the injection piston cylinder (1). The outer chamber (25) is made of non-magnetic material. An inner chamber (26) is fixedly connected inside the outer chamber (25). A metal chamber (2) is slidably connected inside the inner chamber (26). 7) The outer compartment (25), inner compartment (26), and metal compartment (27) are all provided with through holes in their centers. The insert shaft (23) and the central locking pin (2801) are both inserted into the through holes. The upper part of the metal compartment (27) is slidably connected to the locking ball (28) through the opening of the movable hole. The outer wall of the central locking pin (2801) and the locking ball (28) is provided with a concave arc surface, and the arc surface can be fitted with the locking ball (28). The lower inner wall of the metal compartment (27) is fixedly connected to the return spring (29). The return spring (29) is initially in a compressed state. The lower end of the return spring (29) is fixedly connected to the bottom inner wall of the outer compartment (25). The bottom surface of the outer compartment (25) is attached to the magnetic chuck (210). A bent rod (211) is fixedly connected to one side of the outer wall of the magnetic chuck (210). A locking assembly is provided at the upper end of the bent rod (211); The locking assembly includes a perforated horizontal plate (2301) fixedly connected to the upper end face of the outer compartment (25), and a receiving cavity is provided at the end of the perforated horizontal plate (2301) away from the outer compartment (25). The upper end of the bent rod (211) is rotatably connected through the receiving cavity of the perforated horizontal plate (2301). A ratchet disc (2302) is fixedly connected to the end of the bent rod (211) that passes through the receiving cavity of the perforated horizontal plate (2301). A torsion spring pawl (2303) is engaged on one side of the ratchet disc (2302). The torsion spring pawl (2303) is rotatably connected to the inner wall of the receiving cavity of the perforated horizontal plate (2301). A transition is coaxially fixedly connected to the upper end face of the ratchet disc (2302). A shaft (2304) is fixedly connected to a reversing shaft (2305) at its upper end. A combination groove (2306) is provided on the outer circumferential surface of the reversing shaft (2305). The combination groove (2306) is composed of a lower spiral groove and an upper vertical groove, and the spiral groove and the vertical groove are interconnected. A rod-driven sliding ring (2307) is sleeved on the lower outer circumferential surface of the reversing shaft (2305). The end of the rod-driven sliding ring (2307) away from the reversing shaft (2305) is fixedly connected to the outer wall of the insert shaft (23). The rod-driven sliding ring (2307) is slidably connected to the inner wall of the combination groove (2306) through a guide slider (2308) provided inside it.

2. The tympanic membrane puncture and injection device according to claim 1, characterized in that, Both of the handles (21) are arc-shaped, and the outer surface of the handles (21) is covered with a soft rubber layer. The two arc-shaped handles (21) with their surfaces covered with soft rubber pads make it easier for medical staff to hold the piston rod (11).

3. The tympanic membrane puncture and injection device according to claim 1, characterized in that, The inner compartment (26) and the metal compartment (27) are both composed of an upper cone and a lower cylinder, and the metal compartment (27) is made of a magnetic metal material.

4. The tympanic membrane puncture and injection device according to claim 1, characterized in that, The inner walls of the combined groove (2306) are all smoothed, and the length of the spiral groove in the combined groove (2306) is such that the reversing shaft (2305) can rotate 90 degrees.

5. The tympanic membrane puncture and injection device according to claim 1, characterized in that, The inner wall of the rod sliding ring (2307) is provided with a receiving hole at the position corresponding to the guide slider (2308). A spring (2309) is fixedly connected inside the receiving hole on the inner wall of the rod sliding ring (2307). The end of the spring (2309) away from the receiving hole is fixedly connected to the outer wall of the guide slider (2308).

6. The tympanic membrane puncture and injection device according to claim 5, characterized in that, The diameter of the receiving hole on the inner wall of the rod sliding ring (2307) is adapted to the outer diameter of the guide slider (2308), and the guide slider (2308) is spherical in shape.

7. The tympanic membrane puncture and injection device according to claim 1, characterized in that, The auxiliary stabilizing mechanism includes two side grooves (31) formed on the circumferential surface of the injection piston cylinder (1). The two side grooves (31) are symmetrically distributed on the circumferential surface of the injection piston cylinder (1). The inner wall of one of the side grooves (31) is slidably connected to a second side plate (32). The inner wall of the other side groove (31) of the second side plate (32) is slidably connected to a first side plate (24). An extension plate (33) is fixedly connected to the lower end of the second side plate (32). A T-shaped groove is formed below the extension plate (33). A back groove is provided on one side surface near the needle cap (12). The outer wall of the second side plate (32) and the first side plate (24) are fixedly connected to a first-level bracket (34). The lower end of the first-level bracket (34) is fixedly connected to a second-level bracket (35). The lower end of the second-level bracket (35) is fixedly connected to a contour plate (36). The bottom surface of the contour plate (36) is fixedly connected to two support balls (37). The contour plate (36) is in the shape of a semi-circular ring. The two support balls (37) are both hemispherical and of different sizes.

8. The tympanic membrane puncture and injection device according to claim 7, characterized in that, The contour plate (36) is made of a shape-memory deformable material, and both of the support balls (37) are made of rubber.

9. A tympanic membrane puncture and injection device according to claim 1, characterized in that, The secondary fastening needle mechanism includes a limiting shaft two (41) fixedly connected to the lower end of one of the two handles (21). The limiting shaft two (41) is slidably connected to the extension of the upper end of the injection piston cylinder (1). A ball head rod one (42) is fixedly connected to the lower end of the limiting shaft two (41). The lower end of the ball head rod one (42) and the end away from the limiting shaft two (41) is spherical. The end face of the spherical end of the ball head rod one (42) is attached to an assisting block one (43). The assisting block one (43) is slidably connected to the T-shaped groove below the extension plate (33) through a top block (44) fixedly connected to its upper end face. The surface of the assisting block one (43) near the spherical side of the ball head rod one (42) is inclined. A lever (45) is slidably connected to the side surface away from the ball head rod (42) via a sliding groove and a slider. A ring plate (46) is fitted on the outer wall of the needle cap (12). One side of the outer wall of the ring plate (46) is slidably connected to the back groove of the extension plate (33) via an inclined block. The bottom surface of the ring plate (46) is higher than the top surface of the lever (45). A second assisting block (47) is fixedly connected to the bottom surface of the lever (45). The side surface of the second assisting block (47) near the needle cap (12) is inclined. A ball head rod (48) is attached to the inclined side of the second assisting block (47). The upper end of the second ball head rod (48) is fixedly connected to the outer wall of the extension plate (33). The end of the second ball head rod (48) that is attached to the second assisting block (47) is spherical.

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