Nasopharyngeal airway device for preventing tongue fall back airway obstruction

Abstract

The present application belongs to the technical field of medical devices, and particularly relates to a nasopharyngeal ventilation device for preventing airway obstruction caused by tongue falling backward, comprising a catheter assembly and a guide core assembly. The catheter assembly comprises a catheter outer tube, the inside of the catheter outer tube is fixedly connected with an outer tube spring, the two ends of the catheter outer tube are respectively an air inlet end and a patient end, the air inlet end of the catheter outer tube is fixedly connected with a limiting nasal plug, one end of the limiting nasal plug is fixedly connected with an oxygen supply connector in communication with the catheter outer tube, the patient end of the catheter outer tube is provided with a tapered end head, the region of the catheter outer tube close to the patient end is provided with an oxygen increasing area, a plurality of side holes are formed in the oxygen increasing area, the guide core assembly comprises a catheter steel wire, one end of the catheter steel wire is provided with a guide round head, and the other end of the catheter steel wire is fixedly connected with a rotor handle. The present application can effectively reduce the phenomenon that the lumen is crushed or folded during use, leading to poor ventilation, and is relatively smooth when placed.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a nasopharyngeal ventilation device for preventing the tongue from falling back and obstructing the airway. Background Technology

[0002] A nasopharyngeal airway, also known as a nasopharyngeal endotracheal tube, is a simple and cost-effective ventilation device primarily used to relieve upper airway obstruction caused by factors such as posterior displacement of the tongue. Clinically, nasopharyngeal airways are particularly suitable for patients with a tight jaw, trismus, or those who have undergone oropharyngeal surgery or have difficulty with oral airway placement. The nasopharyngeal airway is made of medical-grade polyvinyl chloride and other materials, and is inserted from the nasal cavity into the pharynx, typically extending from the anterior part of the nasal vestibule to the anterior part of the pharyngeal glottis.

[0003] However, traditional nasopharyngeal airways, though flexible, are mostly simple tubular structures that are easily bent and compressed. They are prone to being flattened by nasal packing in the nasal cavity or blocked or flattened by the tongue falling back and the collapsed pharynx after entering the oropharynx through the nasal cavity. Furthermore, they are easy to bend and difficult to advance when directly inserted, leading to insertion failure or repeated operations that increase the risk of mucosal damage. Summary of the Invention

[0004] The purpose of this invention is to provide a nasopharyngeal ventilation device to prevent the tongue from falling back and obstructing the airway. This device can effectively reduce the phenomenon of poor ventilation caused by the tube being flattened or kinked during use, and it is also easier to insert.

[0005] The specific technical solution adopted by this invention is as follows: A nasopharyngeal ventilation device for preventing posterior displacement of the tongue from obstructing the airway includes a catheter assembly and a core assembly; The catheter assembly includes an outer tube, an outer tube spring is fixedly connected inside the outer tube, the two ends of the outer tube are an air inlet end and a patient end, a limiting nasal plug is fixedly connected to the air inlet end of the outer tube, an oxygen supply connector connected to the outer tube is fixedly connected to one end of the limiting nasal plug, and a tapered end is provided at the patient end of the outer tube. An oxygenation zone is provided on the outer tube of the catheter near the patient end, and multiple side holes are provided on the oxygenation zone. The guide core assembly includes a guide wire, one end of which is provided with a guide round head, and the other end of which is fixedly connected to a rotor handle.

[0006] Furthermore, a barium sulfate layer is also provided on the outer tube of the conduit.

[0007] Furthermore, the oxygenation zone is the area 10mm from the patient end on the outer tube of the catheter. The multiple side holes are divided into two groups, and each group of side holes is divided into two rows. The two groups of side holes are arranged at intervals, and the two groups of side holes are arranged at intervals along the length of the outer tube of the catheter.

[0008] Furthermore, the outer tube of the conduit is extruded through a mirror.

[0009] Furthermore, one turn of the outer tube spring is one section, and the distance between two adjacent sections is the pitch. The pitch of the outer tube spring gradually decreases from the patient end to the air inlet end.

[0010] Furthermore, the outer tube of the catheter is made of a soft polymer material.

[0011] Furthermore, the angle between the peripheral surface of the tapered end and the inner wall of the outer tube of the conduit is 40°~60°.

[0012] Furthermore, the outer side of the catheter is also provided with a medical hydrophilic lubricating coating.

[0013] Furthermore, multiple scale lines are provided on the outer side of the catheter along the axial direction of the catheter outer tube, and the distance between two adjacent scale lines is 10mm.

[0014] Furthermore, an airbag is fixedly connected to the outer side of the duct and located near the air inlet end in the oxygenation zone. An air guide channel communicating with the airbag is opened inside the outer duct, and the air guide channel is connected to an air inlet.

[0015] The technical effects achieved by this invention are as follows: This invention provides a nasopharyngeal ventilation device for preventing posterior tongue displacement and airway obstruction. An external tube spring is fixedly connected inside the outer tube of the nasal cannula, giving it good elastic repositioning properties and effectively reducing the risk of airway obstruction due to flattening or kinking during use. During insertion, a guide core assembly provides temporary support for the outer tube, ensuring smooth insertion. A tapered end at the patient's end of the outer tube effectively reduces the risk of puncture to the nasal and pharyngeal mucosa during insertion. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded view of the structure of the present invention; Figure 3 This is the present invention. Figure 1 Side view of the sectional structure at point A in the middle; Figure 4 This is a cross-sectional structural diagram of the present invention; Figure 5 This is a side view of the cross-sectional structure of the outer tube of the catheter in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the structure of the present invention when an airbag is provided on the outer side of the outer tube of the catheter.

[0017] The attached diagram lists the components represented by each number as follows: 11. Outer tube of catheter; 12. Nasal plug for limiting movement; 13. Oxygen supply connector; 14. Side hole; 15. Tapered end; 16. Scale line; 17. Outer tube spring; 18. Airbag; 21. Rotor handle; 22. Catheter wire; 23. Guide round head. Detailed Implementation

[0018] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0019] like Figure 1-5 As shown, a nasopharyngeal ventilation device for preventing posterior displacement of the tongue from obstructing the airway includes a catheter assembly and a core assembly. The catheter assembly includes an outer tube 11, which is extruded through a mirror to facilitate insertion. The two ends of the outer tube 11 are an air inlet and a patient end, respectively. The air inlet of the outer tube 11 is fixedly connected to a limiting nasal plug 12. One end of the limiting nasal plug 12 is fixedly connected to an oxygen supply connector 13 that communicates with the outer tube 11. The oxygen supply connector 13 is used to connect to the oxygen supply pipeline. In use, the outer tube 11 is inserted through the nostril, so that the patient end of the outer tube 11 is inserted into the nasopharynx to establish a nasopharyngeal airway, relieve airway obstruction caused by posterior tongue displacement, and achieve the purpose of preventing airway obstruction caused by posterior tongue displacement. Oxygen is supplied to the patient's pharynx through the patient end to achieve rapid resuscitation. The oxygen supply outlet of the outer tube 11 at the patient end can penetrate into the pharynx about 100mm to 130mm into the nasal cavity for oxygen supply.

[0020] like Figure 1 As shown, multiple scale lines 16 are provided on the outer side of the catheter outer tube 11 along the axial direction of the catheter outer tube 11. The distance between two adjacent scale lines 16 is 10mm. The scale lines 16 are provided to facilitate the determination of the insertion depth of the catheter outer tube 11.

[0021] Meanwhile, the outer side of the catheter outer tube 11 can also be provided with a medical hydrophilic lubricating coating. The material of the medical hydrophilic lubricating coating can be polyvinylpyrrolidone, polyethylene glycol or hydrophilic polyurethane. When it comes into contact with water, it forms a lubricating water film, which improves the lubrication effect, reduces insertion resistance, reduces mucosal friction damage, and at the same time reduces the patient's foreign body sensation.

[0022] like Figures 1-3 As shown, the patient end of the catheter outer tube 11 is provided with a tapered end 15. The outer diameter of the tapered end 15 gradually decreases in the direction from the air inlet end to the patient end. The tapered end 15 can reduce the occurrence of punctures. The angle α between the peripheral surface of the tapered end 15 and the inner wall of the catheter outer tube 11 is preferably 40°~60°.

[0023] Specifically, in this invention, the patient end of the catheter outer tube 11 is configured as a tapered end 15, so that the outer diameter of the catheter outer tube 11 gradually decreases from the air inlet end to the patient end, and the end has a smooth conical constriction structure without sharp edges; during insertion, the smooth conical surface of the tapered end 15 can gently push aside the soft tissues of the nasal cavity and pharynx, reducing the cutting and puncture of the mucosa by the end; at the same time, the conical structure of the tapered end 15 makes the outer diameter of the patient end of the catheter outer tube 11 smaller than the outer diameter of the tube body, further reducing the friction area between the tube body and the mucosa during insertion.

[0024] At the same time, such as Figures 4-5 As shown, an outer tube spring 17 is fixedly connected inside the outer tube 11 of the catheter. The outer tube spring 17 enables the outer tube 11 of the catheter to have good elastic reset performance. The material of the outer tube 11 of the catheter is preferably a soft polymer material, specifically medical grade polyvinyl chloride, medical grade silicone rubber, thermoplastic polyurethane or polyurethane elastomer, which has better skin-friendly effect and less mucosal damage.

[0025] It is important to note that one turn of the outer tube spring 17 is one segment, and the distance between two adjacent segments is the pitch. The outer tube spring 17 can be a constant pitch spring or a variable pitch spring. In this technical solution, a variable pitch spring is preferred, that is, the pitch of the outer tube spring 17 gradually decreases from the patient end to the air inlet end. This makes the part of the catheter outer tube 11 near the patient end more flexible, easier to fit the physiological curvature of the nasal cavity, and reduces insertion resistance and mucosal damage. The part of the catheter outer tube 11 near the air inlet end has stronger support and is less prone to bending and blockage.

[0026] A barium sulfate layer is also provided on the outer tube 11 of the catheter. By providing a barium sulfate layer, the placement position of the outer tube 11 of the catheter can be determined using X-rays.

[0027] like Figure 1 , Figure 3 and Figure 5 As shown, in order to improve the oxygen supply, an oxygenation zone is provided on the outer tube 11 of the catheter near the patient end. The oxygenation zone is preferably located 10 mm from the patient end of the outer tube 11 of the catheter. Multiple side holes 14 are provided on the oxygenation zone, and the number of side holes 14 is preferably twelve. like Figure 5 As shown, the multiple side holes 14 are divided into two groups, and each group of side holes 14 is divided into two rows. The two groups of side holes 14 are arranged at intervals. The two groups of side holes 14 are arranged at intervals along the length of the outer tube 11 of the catheter, which can better deliver oxygen to the patient's throat.

[0028] like Figures 1-3As shown, the guide core assembly includes a guide wire 22, one end of which is provided with a guide head 23, preferably a hemispherical structure. The other end of the guide wire 22 is fixedly connected to a rotor handle 21, which facilitates the operation of the guide wire 22.

[0029] In use, the guide core assembly is inserted through the air inlet end of the outer tube 11, so that the guide round head 23 protrudes from the patient end or is located inside the tapered end 15. The catheter wire 22 runs through the entire lumen of the outer tube 11. The catheter wire 22 is made of stainless steel and has a certain degree of rigidity and flexibility. After insertion, it provides temporary support for the soft outer tube 11, so that the outer tube 11 has sufficient pushing force during insertion and can be smoothly advanced along the physiological curvature of the nasal cavity, reducing the phenomenon of bending or stacking due to the outer tube 11 being too soft. After insertion, the operator holds the rotor handle 21 to pull the catheter wire 22 out of the outer tube 11, and the outer tube 11 returns to its soft state.

[0030] like Figure 6 As shown, in some embodiments, an air bag 18 is fixedly connected to the outer side of the catheter 11 and located near the air inlet end in the oxygenation zone. An air guide channel communicating with the air bag 18 is opened inside the catheter 11. The air guide channel is connected to an air inlet. After the catheter 11 is inserted, the air bag 18 can be inflated to form an air-blocking structure in the patient's pharynx near the nose, thereby reducing oxygen leakage through the nose when oxygen is introduced into the pharynx through the side hole 14.

[0031] The airbag 18 is preferably made of latex. When not inflated, it can retract to the outside of the outer tube 11 of the catheter, reducing the combined outer diameter of the outer tube 11 and the airbag 18, thus facilitating the insertion of the outer tube 11.

[0032] Example 1:

[0033] This embodiment discloses a specific structure of the outer tube 11 of the catheter, as follows: Figure 5 As shown, the inner diameter of the catheter outer tube 11 is ID, the outer diameter of the catheter outer tube 11 is 0D, the length of the outer tube spring 17 is L1, the distance between the outer tube spring 17 and the patient end is L2, the distance between the outer tube spring 17 and the limiting nasal plug 12 is L3, the distance between the patient end and one set of side holes 14 is L4, the distance between the patient end and another set of side holes 14 is L5, and the distance between two adjacent side holes 14 in the same row of side holes 14 is L6. The specific dimensions are shown in Table 1, and the unit in Table 1 is mm.

[0034] Table 1:

[0035] The working principle of this invention is as follows: When in use, first insert the guide wire 22 of the guide core assembly into the lumen of the outer tube 11 of the guide tube, so that the guide round head 23 is located at the tapered end 15.

[0036] The operator holds the air inlet end of the catheter outer tube 11 and inserts the patient end into one nostril of the patient, slowly advancing it along the physiological curvature of the nasal cavity to the pharynx. During insertion, the catheter wire 22 provides temporary support for the catheter outer tube 11; the operator can determine the insertion depth according to the scale lines 16 on the tube.

[0037] After insertion, use the rotor handle 21 to pull out the cannula wire 22 and connect the oxygen supply connector 13 to the oxygen supply pipeline. Oxygen is delivered to the patient's pharynx through the lumen of the outer tube 11 from the tapered end 15 and the side hole 14, establishing a clear oxygen supply channel and relieving airway obstruction caused by posterior tongue displacement. If the cannula position needs to be confirmed, it can be located using barium sulfate layer imaging under X-ray. If an air bag 18 is provided, it can be inflated through the air inlet after insertion to reduce oxygen leakage through the nose.

[0038] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A nasopharyngeal ventilation device for preventing posterior displacement of the tongue from obstructing the airway, characterized in that: Includes catheter assembly and guide core assembly; The catheter assembly includes an outer tube (11), an outer tube spring (17) is fixedly connected inside the outer tube (11), the two ends of the outer tube (11) are an air inlet end and a patient end, respectively, a limiting nasal plug (12) is fixedly connected to the air inlet end of the outer tube (11), an oxygen supply connector (13) connected to the limiting nasal plug (12) is fixedly connected to one end of the limiting nasal plug (12), and a tapered end (15) is provided at the patient end of the outer tube (11). An oxygenation zone is provided on the outer tube (11) of the catheter near the patient end, and multiple side holes (14) are provided on the oxygenation zone. The guide core assembly includes a guide wire (22), one end of which is provided with a guide round head (23), and the other end of which is fixedly connected to a rotor handle (21).

2. The nasopharyngeal ventilation device for preventing posterior displacement of the tongue and airway obstruction according to claim 1, characterized in that: A barium sulfate layer is also provided on the outer tube (11) of the conduit.

3. A nasopharyngeal ventilation device for preventing posterior displacement of the tongue and airway obstruction according to claim 1, characterized in that: The oxygenation zone is the area 10 mm from the patient end on the outer tube (11) of the catheter. The multiple side holes (14) are divided into two groups, and each group of side holes (14) is divided into two columns. The two groups of side holes (14) are arranged in an alternating manner, and the two groups of side holes (14) are arranged in an alternating manner along the length of the outer tube (11).

4. A nasopharyngeal ventilation device for preventing posterior displacement of the tongue and airway obstruction according to claim 1, characterized in that: The outer tube (11) of the catheter is extruded through a mirror.

5. A nasopharyngeal ventilation device for preventing posterior displacement of the tongue and airway obstruction according to claim 1, characterized in that: The outer tube spring (17) has one helix as one section, and the distance between two adjacent sections is the pitch. The pitch of the outer tube spring (17) gradually decreases from the patient end to the air inlet end.

6. A nasopharyngeal ventilation device for preventing posterior displacement of the tongue and airway obstruction according to claim 1, characterized in that: The outer tube (11) of the catheter is made of a soft polymer material.

7. A nasopharyngeal ventilation device for preventing posterior displacement of the tongue and airway obstruction according to claim 1, characterized in that: The angle between the peripheral side of the tapered end (15) and the inner wall of the outer tube (11) of the conduit is 40°~60°.

8. A nasopharyngeal ventilation device for preventing posterior displacement of the tongue and airway obstruction according to claim 1, characterized in that: The outer side of the catheter outer tube (11) is also provided with a medical hydrophilic lubricating coating.

9. A nasopharyngeal ventilation device for preventing posterior displacement of the tongue and airway obstruction according to claim 1, characterized in that: The outer side of the catheter tube (11) is provided with multiple scale lines (16) along the axial direction of the outer tube (11), and the distance between two adjacent scale lines (16) is 10mm.

10. A nasopharyngeal ventilation device for preventing posterior displacement of the tongue and airway obstruction according to claim 1, characterized in that: An air bag (18) is fixedly connected to the outer side of the duct (11) and located near the air inlet in the oxygenation zone. An air guiding channel is opened inside the duct (11) and communicates with the air bag (18). The air guiding channel is connected to an air inlet.

Images