A device for administering a medicament to the middle ear via the eustachian tube

Abstract

The utility model discloses a device of middle ear dosing through Eustachian tube, include: fixed pipe, sliding tube, guide pipe, dosing catheter and guide wire, one end of sliding tube is installed with dosing catheter through female joint, and dosing catheter is placed at the axis of sliding tube and stretches out from the other end of sliding tube, the end of male joint or syringe of female joint on sliding tube can be connected, and the male joint is fixed with guide wire and guide wire stretches into dosing catheter, one end of fixed pipe is fixedly installed with guide pipe, and sliding tube is inserted into fixed pipe and can slide in fixed pipe, and dosing catheter can slide in guide pipe synchronously. In initial state, the male joint connected with guide wire is installed on female joint, and dosing catheter does not stretch out guide pipe, when guide pipe is sent to Eustachian tube mouth part, sliding tube is pushed to stretch out dosing catheter from guide pipe, and the dosing catheter that stretches out passes through Eustachian tube isthmus and enters middle ear, when dosing catheter enters middle ear, the male joint is switched to syringe, and middle ear dosing is completed.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a device for administering medication to the middle ear via the Eustachian tube. Background Technology

[0002] Middle ear inflammation is a common ear disease in clinical practice. Treatment requires precise administration of medication into the middle ear cavity. Current middle ear medication administration techniques are mainly divided into two categories:

[0003] 1. Transtympanic puncture drug delivery technique: This technique involves puncturing or cutting the patient's eardrum to directly inject medication into the middle ear. The core technique involves using a puncture needle to penetrate the eardrum barrier to complete the drug delivery. However, this procedure has the following drawbacks: it directly damages the patient's eardrum structure, which may cause intraoperative pain and postoperative infection, and may also affect the normal physiological functions of the eardrum (such as sound conduction). Some patients may require additional eardrum repair treatment after the procedure.

[0004] 2. Nasopharyngeal-Eustral Tube Drug Delivery Technique: To avoid damaging the eardrum, current clinical practice also uses the eustachian tube route for drug delivery. The core technique involves the doctor holding a simple guide tube, inserting it through the patient's nasopharynx to the opening of the eustachian tube, and then pushing the thin catheter along the inner wall of the guide tube, passing through the isthmus of the eustachian tube and entering the middle ear cavity to administer the drug. However, this procedure has the following drawbacks: it requires the doctor to use both hands (one hand holding the guide tube, the other pushing the thin catheter), relying entirely on the doctor's experience to judge the advancement of the thin catheter. It is impossible to visually observe the catheter's position within the eustachian tube, and improper control of the advancement force or depth can easily damage the eustachian tube mucosa or middle ear tissue. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model provides a device for administering drugs to the middle ear through the Eustachian tube.

[0006] This utility model discloses a device for administering medication to the middle ear via the Eustachian tube, comprising: a fixed tube, a sliding tube, a guide tube, a medication delivery catheter, and a guide wire;

[0007] One end of the sliding tube is fitted with the drug delivery catheter via a female connector. The drug delivery catheter is positioned at the axis of the sliding tube and extends from the other end of the sliding tube. A male connector or the end of a syringe can be connected to the female connector of the sliding tube. The guide wire is fixed to the male connector and extends into the drug delivery catheter.

[0008] A guide tube is fixedly installed at one end of the fixed tube, and the other end of the sliding tube is inserted into the fixed tube from the other end of the fixed tube and can slide inside the fixed tube. The drug delivery catheter is inserted into the guide tube and can slide inside the guide tube.

[0009] As a further improvement to this utility model,

[0010] In the initial state, the male connector with the guide wire is installed on the female connector, and the drug delivery catheter does not extend out of the guide tube;

[0011] When the guide tube is inserted into the opening of the Eustachian tube, the sliding tube is pushed to extend the drug delivery catheter out of the guide tube and the extended drug delivery catheter passes through the isthmus of the Eustachian tube and enters the middle ear;

[0012] When the drug delivery catheter enters the middle ear, the male connector is switched to a syringe to complete the middle ear drug delivery.

[0013] As a further improvement of this utility model, the male connector and the female connector are mating Luer connectors.

[0014] As a further improvement of this utility model, a first finger ring is installed on the fixed tube to facilitate hand operation, and a second finger ring is installed on the sliding tube to facilitate hand operation.

[0015] As a further improvement of this utility model, the guidewire does not extend out of the drug delivery catheter, and the distance between the end of the guidewire and the opening of the drug delivery catheter is 3-4 mm.

[0016] As a further improvement of this utility model, one end of the fixed tube is fitted with the guide tube by a fixing nut, and the other end of the fixed tube is provided with a positioning nut; the sliding tube is also provided with a positioning post, and the positioning post is provided with a horizontally sliding positioning screw and a first fastening screw for locking or unlocking the positioning screw. One end of the positioning screw can abut against the end of the positioning nut. The positioning screw is parallel to the axis of the fixed tube or the sliding tube. The extension length of the positioning screw is adjusted by the first fastening screw to adjust the length of the drug delivery catheter extending out of the guide tube when the positioning screw abuts against the end face of the positioning nut.

[0017] As a further improvement of this utility model, a second fastening screw is screwed onto the sliding tube, and the end of the second fastening screw can abut against the female connector; the drug delivery catheter is fixed on the sliding tube by the second fastening screw.

[0018] As a further improvement of this utility model, a third fastening screw is screwed onto the fixed tube, and the end of the third fastening screw can abut against the sliding tube; the sliding tube is fixed to the fixed tube by the third fastening screw.

[0019] As a further improvement of this utility model, at least one guide groove is provided on the side wall of the fixed tube along the axial direction, and at least one guide block is provided on the outer wall of the sliding tube. The guide block is slidably disposed in the guide groove. The sliding tube is prevented from rotating in the fixed tube by the limitation of the guide block and the guide groove.

[0020] As a further improvement of this utility model, the guide wire is a stainless steel guide wire, and the fixed tube is provided with an observation window, and the window of the observation window is provided with scale lines.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] This invention enables the drug delivery catheter to be precisely pushed to the drug delivery location after passing through the isthmus of the Eustachian tube. The pushing force and depth are easy to control, avoiding damage to the Eustachian tube mucosa or middle ear tissue. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the device for administering medication to the middle ear via the Eustachian tube disclosed in this utility model;

[0024] Figure 2 for Figure 1 A structural diagram showing a 90-degree rotation.

[0025] Figure 3 for Figure 1 A sectional view;

[0026] Figure 4 for Figure 3 Enlarged view of point A;

[0027] Figure 5 This is a structural diagram of the device for administering medication to the middle ear via the Eustachian tube, as disclosed in this utility model, connected to a syringe.

[0028] Figure 6 for Figure 5 A sectional view.

[0029] In the picture:

[0030] 1. Fixed tube; 2. Sliding tube; 3. Guide tube; 4. Drug delivery catheter; 5. Guide wire; 6. Male connector; 7. Female connector; 8. Positioning screw; 9. First fastening screw; 10. Second fastening screw; 11. Third fastening screw; 12. First ring; 13. Second ring; 14. Fixed nut; 15. Positioning nut; 16. Guide block; 17. Guide groove; 18. Syringe; 19. Observation window. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] The present invention will now be described in further detail with reference to the accompanying drawings:

[0033] like Figures 1-6 As shown, this utility model provides a device for administering medication to the middle ear via the Eustachian tube, comprising: a fixed tube 1, a sliding tube 2, a guide tube 3, a medication delivery catheter 4, a guide wire 5, and a syringe 18; wherein,

[0034] The fixed tube 1 of this invention has an open-end structure. The front end of the fixed tube 1 (the end that extends into the nasopharynx) is fixedly fitted with a guide tube 3 by a fixing nut 14. The guide tube 3 communicates with the lumen of the fixed tube 1. A positioning nut 15 is installed at the end of the fixed tube 1. The sliding tube 2 of this invention has a drug delivery catheter 4 installed at its end through a female connector 7. The drug delivery catheter 4 is positioned at the axis of the sliding tube 2 and extends from the other end of the sliding tube 2. A male connector 6 or the end of a syringe 18 can be connected to the female connector 7 of the sliding tube 2. A guide wire 5 is fixed on the male connector 6 and extends into the drug delivery catheter 4. The front end of the sliding tube 2 is inserted into the fixed tube 1 from the end of the fixed tube 1 and can slide within the fixed tube 1. The drug delivery catheter 4 is simultaneously inserted into the guide tube 3 and can slide within the guide tube 3 under the push of the sliding tube 2.

[0035] In its initial state, the male connector 6, connected to the guide wire 5, is mounted on the female connector 7. Figures 1-3 As shown, at this time, the drug delivery catheter 4 has not extended out of the guide tube 3; when the guide tube 3 is inserted into the opening of the Eustachian tube, the sliding tube 2 is pushed forward to extend the drug delivery catheter 4 out of the guide tube 3 and the extended drug delivery catheter 4 passes through the isthmus of the Eustachian tube and enters the middle ear; when the drug delivery catheter enters the middle ear, the male connector 6 is switched to the syringe 18, the syringe 18 and the female connector 7 are assembled, the syringe 18 is pushed forward, and the liquid in the syringe 18 enters the middle ear through the drug delivery catheter 4 to complete the middle ear drug delivery.

[0036] Furthermore, the male connector 6 and female connector 7 of this utility model are mating Luer connectors.

[0037] Furthermore, to facilitate one-handed operation by doctors, two first finger rings 12 are installed on the fixed tube 1 for easy hand operation, and a second finger ring 13 is installed on the sliding tube 2 for easy hand operation.

[0038] Furthermore, in this invention, the guidewire 5 is placed inside the drug delivery catheter 4 and does not extend beyond the drug delivery catheter, and the distance between the end of the guidewire 5 and the opening of the drug delivery catheter 4 is 3-4 mm. In addition, the guidewire of this invention is made of stainless steel with good toughness to assist the drug delivery catheter 4 in passing through the isthmus; without the guidewire, the drug delivery catheter 4 would be too soft to pass through the isthmus of the Eustachian tube.

[0039] Furthermore, in order to ensure the limited extension length of the drug delivery catheter 4 from the guide tube 3, the sliding tube 2 of this invention is also provided with a positioning post. The positioning post is provided with a horizontally sliding positioning screw 8 and a first fastening screw 9 for locking or unlocking the positioning screw. One end of the positioning screw 8 can abut against the end of the positioning nut 15. The positioning screw 8 is parallel to the axis of the fixed tube 1 or the sliding tube 2. The extension length of the positioning screw 8 is adjusted by the first fastening screw 9 to adjust the length of the drug delivery catheter 4 extending out of the guide tube 3 when the positioning screw 8 abuts against the end face of the positioning nut 15.

[0040] Furthermore, in order to position the drug delivery catheter 4 on the sliding tube 2, a second fastening screw 10 is screwed onto the sliding tube 2 of this invention, and the end of the second fastening screw 10 can abut against the female connector 7; the drug delivery catheter 4 is fixed on the sliding tube 2 by the second fastening screw 10.

[0041] Furthermore, in order to position the sliding tube 2 on the fixed tube 1, a third fastening screw 11 is screwed onto the fixed tube 1, and the end of the third fastening screw 11 can abut against the sliding tube 2; the sliding tube 2 is fixed to the fixed tube 1 by the third fastening screw 11.

[0042] Furthermore, to prevent the sliding tube 2 from rotating within the fixed tube 1 during its back-and-forth sliding motion, this invention provides at least two symmetrical guide grooves 17 axially along the side wall of the fixed tube 1. Two corresponding guide blocks 16 are provided on the outer wall of the sliding tube 2, sliding within the guide grooves 17. The guide blocks 16 and the guide grooves 17 limit the sliding tube's rotation within the fixed tube. Additionally, the guide grooves 17 extend through the rear end of the fixed tube 1 but not through the front end, facilitating the removal of the positioning nut 15 and allowing the sliding tube 2 to be taken out of the fixed tube 1.

[0043] Furthermore, the fixed tube 1 of this utility model is provided with an observation window 19, and the window of the observation window 19 is provided with scale lines to facilitate the viewing of the feed amount of the sliding tube 2.

[0044] The method of using this utility model includes:

[0045] Insert the guidewire 5 through the drug delivery catheter 4 and into the sliding tube 2. Secure the drug delivery catheter 4 with the second fastening screw 10. Retract the drug delivery catheter 4 back to its initial position, fully retracted into the guide tube 3. At this point, the doctor holds the device in one hand and the endoscope in the other. Under endoscopy, insert the device through the nasopharynx into the opening of the Eustachian tube. Then, begin pushing the sliding tube 2 to allow the drug delivery catheter 4 to slowly enter the Eustachian tube, pass through the isthmus, and enter the middle ear. Then, lock the third fastening screw 11 to prevent the drug delivery catheter 4 from moving. At this point, remove the endoscope and set it aside. Remove the male connector 6 to take out the guidewire 5 from the drug delivery catheter 4. Then, connect the syringe 18, which has been filled with medication, to the female connector 7 to deliver medication to the middle ear. After the medication is injected, remove the syringe, then loosen the third fastening screw 11, withdraw the drug delivery catheter to the limit position of the guide block, and then withdraw the device.

[0046] The advantages of this utility model are:

[0047] This invention enables precise delivery of the drug delivery catheter to the administration site after it passes through the isthmus of the Eustachian tube. The advancement force and depth are easily controlled, avoiding damage to the Eustachian tube mucosa or middle ear tissue. The invention uses a feed limiting structure (positioning screw 8 and positioning nut 15) to ensure that the drug delivery catheter 3 does not enter the middle ear more than 50 mm (safe distance), otherwise it will damage the middle ear tissue. A retraction limiting structure (guide block 16, guide groove 17, and positioning nut 15) ensures that the drug delivery catheter is completely retracted into the guide tube without retracting too deeply and affecting operation.

[0048] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for administering medication to the middle ear via the Eustachian tube, characterized in that, include: Fixed tubes, sliding tubes, guide tubes, drug delivery catheters, and guidewires; One end of the sliding tube is fitted with the drug delivery catheter via a female connector. The drug delivery catheter is positioned at the axis of the sliding tube and extends from the other end of the sliding tube. A male connector or the end of a syringe can be connected to the female connector of the sliding tube. The guide wire is fixed to the male connector and extends into the drug delivery catheter. A guide tube is fixedly installed at one end of the fixed tube, and the other end of the sliding tube is inserted into the fixed tube from the other end of the fixed tube and can slide inside the fixed tube. The drug delivery catheter is inserted into the guide tube and can slide inside the guide tube.

2. The apparatus as claimed in claim 1, characterized in that, In the initial state, the male connector with the guide wire is installed on the female connector, and the drug delivery catheter does not extend out of the guide tube; When the guide tube is inserted into the opening of the Eustachian tube, the sliding tube is pushed to extend the drug delivery catheter out of the guide tube and the extended drug delivery catheter passes through the isthmus of the Eustachian tube and enters the middle ear; When the drug delivery catheter enters the middle ear, the male connector is switched to a syringe to complete the middle ear drug delivery.

3. The apparatus as described in claim 1 or 2, characterized in that, The male and female connectors are mating Luer connectors.

4. The apparatus as described in claim 1 or 2, characterized in that, The fixed tube is equipped with a first finger ring for easy hand operation, and the sliding tube is equipped with a second finger ring for easy hand operation.

5. The apparatus as described in claim 1 or 2, characterized in that, The guidewire does not extend beyond the drug delivery catheter, and the distance between the end of the guidewire and the opening of the drug delivery catheter is 3-4 mm.

6. The apparatus as described in claim 1 or 2, characterized in that, One end of the fixed tube is fitted with the guide tube via a fixing nut, and the other end of the fixed tube is fitted with a positioning nut. The sliding tube is also fitted with a positioning post, which is equipped with a horizontally sliding positioning screw and a first fastening screw for locking or unlocking the positioning screw. One end of the positioning screw can abut against the end of the positioning nut. The positioning screw is parallel to the axis of the fixed tube or the sliding tube. The extension length of the positioning screw is adjusted by the first fastening screw to adjust the length of the drug delivery catheter extending out of the guide tube when the positioning screw abuts against the end face of the positioning nut.

7. The apparatus as described in claim 1 or 2, characterized in that, A second fastening screw is screwed onto the sliding tube, and the end of the second fastening screw can abut against the female connector; the drug delivery catheter is fixed to the sliding tube by the second fastening screw.

8. The apparatus as claimed in claim 1 or 2, characterized in that, A third fastening screw is screwed onto the fixed tube, and the end of the third fastening screw can abut against the sliding tube; the sliding tube is fixed to the fixed tube by the third fastening screw.

9. The apparatus as claimed in claim 1 or 2, characterized in that, At least one guide groove is provided on the side wall of the fixed tube along the axial direction, and at least one guide block is provided on the outer wall of the sliding tube. The guide block is slidably disposed in the guide groove. The sliding tube is prevented from rotating in the fixed tube by the limitation of the guide block and the guide groove.

10. The apparatus as claimed in claim 1 or 2, characterized in that, The guide wire is made of stainless steel, and the fixed tube is provided with an observation window, with scale lines at the window of the observation window.

Images