Retrograde tracheal intubation device capable of improving glottis trafficability

Abstract

The retrograde tracheal intubation device comprises a tracheal catheter main body, a built-in guide tube core, a one-way locking mechanism and a special traction guide wire, the tracheal catheter main body is a flexible hollow tube body, the built-in guide tube core is arranged in the tracheal catheter main body, a variable-diameter conical head is arranged at the far end of the built-in guide tube core, and the one-way locking mechanism is arranged at the tail end of the built-in guide tube core. The one-way locking mechanism is arranged in the reducing conical head and used for achieving one-way mechanical locking. The special traction guide wire comprises a wire body, the middle section of the wire body is provided with a traction protrusion, and the radial size of the traction protrusion is smaller than the hole diameter of the center through hole. And meanwhile, a transition air bag and a clamping air bag which are matched with each other are also arranged. By pulling the special traction guide wire at one end of the cricothyroid membrane, the built-in guide tube core and the tracheal catheter main body can sequentially pass through the glottis under the action of the traction bulge.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a retrograde endotracheal intubation device for difficult airway management, and more particularly to a retrograde endotracheal intubation device that can improve glottic passage. Background Technology

[0002] Endotracheal intubation is a key technique for establishing an artificial airway in anesthesia, emergency medicine, and critical care. Retrograde endotracheal intubation, as an important alternative technique in difficult airway situations, typically involves guiding a guide tube upwards through the cricothyroid membrane or trachea via puncture to the oral cavity or nasal cavity, and then successfully inserting the endotracheal tube into the trachea. Retrograde endotracheal intubation is often used in extreme cases where conventional laryngoscopy cannot expose the glottis.

[0003] Current retrograde endotracheal intubation techniques still have the following shortcomings in clinical application: During intubation, the operator cannot visually judge the relative positions of the guide, endotracheal tube, and glottis, relying on experience and exhibiting a high degree of blindness; the complex anatomical structure of the glottic region makes the tip of the endotracheal tube prone to interference with structures such as the epiglottis and arytenoid cartilage during retrograde guidance, leading to difficulty in passage or even failure. Traditional endotracheal tubes have a simple tip structure, insufficient compliance and directionality, making it difficult to adapt to the special mechanical path of passing through the glottis from top to bottom during retrograde intubation. When existing intubation devices descend along the retrograde guidewire, due to the large opening at the distal end of the endotracheal tube and the obvious gap between the guide and the tube wall (i.e., a "step-like" feeling), the tip of the tube often gets stuck at the vallecula, arytenoid cartilage, or glottic cleft. Furthermore, repeated attempts can easily cause damage to the glottic and airway mucosa, increasing the risk of complications. Summary of the Invention

[0004] The present invention aims to solve the above problems by providing a step effect through a variable diameter soft tip design, a smooth transition from guide wire to endotracheal tube by providing a new guide element on the basis of the guide wire, and significantly improving the glottic passage of the intubation device through structural optimization, thereby improving the success rate and safety of intubation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a retrograde endotracheal intubation device that can improve glottic passage, comprising: an endotracheal tube body, an internal guide tube core, a one-way locking mechanism, and a specially designed guide wire;

[0006] The main body of the endotracheal tube is a flexible hollow tube.

[0007] The built-in guide tube is disposed inside the body of the endotracheal tube, and its distal end is provided with a variable diameter conical head, the top of which is provided with a central through hole;

[0008] The one-way locking mechanism is disposed inside the variable diameter conical head and is used to achieve one-way mechanical locking;

[0009] The specially designed traction guide wire includes a main body of wire, and a traction protrusion is provided in the middle section of the main body of wire;

[0010] Wherein, the radial dimension of the traction protrusion is smaller than the diameter of the central through hole.

[0011] During retrograde endotracheal intubation, a specially designed guidewire is guided retrogradely through the airway to the nasal cavity or oral cavity via a cricothyroid membrane puncture needle. The guidewire is then passed through an internal guide stylet, which is then inserted into the main body of the endotracheal tube. The endotracheal tube and stylet are then advanced through the nasal cavity or oral cavity into the patient's pharynx. When the endotracheal tube and stylet are advanced to the vicinity of the glottis, the guidewire is pulled from the cricothyroid membrane. The traction protrusion of the guidewire, as it passes the variable-diameter conical tip, pulls the tip through the glottis, thereby guiding the endotracheal tube through the glottis.

[0012] The one-way locking mechanism includes multiple elastic valves that are inclined towards the proximal end of the tube core. One end of each elastic valve is fixedly disposed inside the variable diameter conical head, and the other end faces the proximal end of the built-in guide tube core. The center of the through hole formed by the other end of the elastic valve is on the same axis as the center of the central through hole.

[0013] When the specially designed guide wire is pulled, the traction protrusion will be stuck in the through hole formed by the elastic valve when it passes the variable diameter conical head due to the unidirectional resistance of the elastic valve. When the specially designed guide wire is pulled, the variable diameter conical head will move together with the specially designed guide wire and then pass through the glottis.

[0014] The one-way locking mechanism also includes multiple springs, one end of which is fixedly connected to the inner wall of the variable diameter conical head, and the other end is fixedly connected to the elastic valve, and the spring is in a compressed state.

[0015] Because the elastic valve itself has a certain degree of elasticity, it can return to its original shape. However, in order to better maintain the overall structure of the elastic valve, a spring is set behind each valve to provide support for the elastic valve, which can effectively prevent the traction protrusion from being pulled out from inside the variable diameter conical head.

[0016] The built-in guide tube also includes a transition airbag, which includes a first airbag and a second airbag. The first airbag and the second airbag are both located on the outside of the built-in guide tube. The first airbag and the second airbag are sequentially connected to a first ventilation line. The first ventilation line is connected to a first ventilation valve. The first airbag is located at the tail end of the variable diameter conical head. After inflation, the diameter of the first airbag and the second airbag does not exceed the outer diameter of the tracheal tube body.

[0017] A transition airbag is placed at the tail end of the variable-diameter conical head. After the transition airbag is inflated, it expands to fill the head of the endotracheal tube body. At the same time, another part of the transition airbag is located inside the endotracheal tube body. After the transition airbag expands, it fills the gap between the endotracheal tube body and the outer side of the built-in guide tube. The friction between the transition airbag and the inner wall of the endotracheal tube body makes the two relatively fixed, thus facilitating the endotracheal tube body to enter the airway through the glottis along with the built-in guide tube.

[0018] The traction protrusion is spherical, ellipsoidal, or conical, with a maximum radial diameter of The diameter of the main body of the filament is d; the maximum mirror diameter of the traction protrusion satisfies the following condition: .

[0019] The variable-diameter tapered head has a hardness gradient structure, with its Shore hardness gradually increasing from the distal tip to the proximal end. The outer surface of the variable-diameter tapered head is provided with a hydrophilic lubricating coating.

[0020] The endotracheal tube body includes a snap-fit ​​airbag, which is disposed on the inner wall of the endotracheal tube body and connected to a second ventilation tube, which is connected to a second ventilation valve.

[0021] After the variable-diameter conical head of the built-in guide tube is in place, the snap-fit ​​airbag is located in the gap between the first airbag and the second airbag. At this time, the snap-fit ​​airbag and the transition airbag are inflated. When the built-in guide tube is pulled by the special traction guide wire, the second airbag will push the snap-fit ​​airbag to move towards the glottis. At the same time, it can also push the endotracheal tube body to move towards the glottis, so that the endotracheal tube body and the built-in guide tube enter the airway through the glottis together.

[0022] The endotracheal tube body also includes a suffocating airbag, which is located on the outside of the endotracheal tube body and connected to a third ventilation line, which is connected to a third ventilation valve.

[0023] The endotracheal tube body has metal spiral reinforcing ribs embedded in its wall to enhance the overall structure's compressive strength and torque transmission performance.

[0024] The gap between the distal tip of the variable-diameter conical head and the traction protrusion is no more than 1 mm, so as to ensure that the specially designed traction guide wire can pass smoothly through the variable-diameter conical head from the outside. At the same time, it minimizes the "step" at the end of the guide wire and the built-in guide tube core as much as possible, forming a relatively continuous and smooth transition surface, and eliminating the step effect when the glottis passes through.

[0025] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention fundamentally improves the mechanical mechanism of glottic passage during retrograde endotracheal intubation. Traditional retrograde intubation relies on externally pushing the catheter, with the force point outside the mouth and nose. The force transmission path is long and easily bent due to the limitations of the oral cavity space, making it difficult to align the catheter tip with the glottic axis. This invention innovatively achieves active traction within the airway through the cooperation of a specially designed guidewire and an internal guide stylet. The traction force acts directly on the tip of the stylet located at the glottic entrance, and the direction of the force (pulling downwards from the neck) is highly consistent with the anatomical axis of the trachea. This change in mechanical mode greatly reduces the difficulty of the catheter entering the glottis and significantly improves the success rate of intubation in difficult airways.

[0026] This invention also eliminates the step effect, achieving a non-invasive and smooth transition. In existing technologies, there is a significant diameter difference between the guidewire and the endotracheal tube, creating a physical "step" that can easily become stuck in the arytenoid cartilage or vocal cords, causing damage and obstruction. This invention solves this problem through a dual design. First, at the microscopic level, the end of the built-in guide tube is equipped with a variable-diameter conical head. The diameter of the head of this conical head is much smaller than the inner diameter of the endotracheal tube body, and closer to the diameter of the guidewire, effectively reducing the diameter difference between the guidewire and the endotracheal tube body, thus eliminating the step between them. At the macro level, the first airbag is positioned at the glottic inlet of the endotracheal tube body. After inflation, it can fill the irregular structure at the end of the endotracheal tube body. The diameter of the first airbag after inflation does not exceed the outer diameter of the endotracheal tube body. With the combined action of the variable-diameter conical head, a smooth transition can also be achieved between the built-in guide tube and the endotracheal tube body. This makes the entire device act like a perfect wedge dilator, which can gently "squeeze open" the glottic cleft and minimize mechanical damage to the laryngeal mucosa and vocal cords.

[0027] The guidewire, internal guide tube, and endotracheal tube body are connected as a whole through the coordinated action of a specially designed guidewire with traction protrusions, a transition cuff, and a locking cuff. The variable-diameter conical head features a gradually decreasing Shore hardness from tip to tip, allowing the entire endotracheal tube to pass through the glottis and enter the airway via guidewire traction. The transition and locking cuffs ensure that after the endotracheal tube body has successfully entered the airway, the gas in these cuffs is released, allowing the internal guide tube and the specially designed guidewire to be smoothly withdrawn from the endotracheal tube body without affecting its normal use. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a retrograde endotracheal intubation device that can improve glottic passage according to the present invention;

[0029] Figure 2 For the present invention Figure 1 Enlarged view of a portion of point A in the middle;

[0030] Figure 3 For the present invention Figure 2 Cross-sectional view;

[0031] Figure 4 For the present invention Figure 3 Enlarged view of a section at point B in the middle;

[0032] Figure 5 This is a schematic diagram of the specially designed traction guide wire for this invention;

[0033] Figure 6 This is a schematic diagram of the structure of the built-in guide die of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the traction protrusion of the present invention passing through the elastic valve;

[0035] Figure 8 This is a schematic diagram of the structure of the transition airbag and the snap-fit ​​airbag when they are inflated according to the present invention;

[0036] Figure 9 This is a schematic diagram of the specially designed traction guide wire when the traction protrusion of the present invention is ellipsoidal;

[0037] Figure 10 This is a schematic diagram of the specially designed traction guide wire when the traction protrusion of the present invention is conical.

[0038] Reference numerals in the attached diagram: 1. Endotracheal tube body; 2. Internal guide tube core; 3. Specially designed traction guide wire; 4. Variable diameter conical head; 5. Central through hole; 6. One-way locking mechanism; 7. Wire body body; 8. Traction protrusion; 9. Elastic valve; 10. Spring; 11. Transition airbag; 12. First airbag; 13. Second airbag; 14. First ventilation line; 15. First ventilation valve; 16. Snap-fit ​​airbag; 17. Second ventilation line; 18. Blocking airbag; 19. Third ventilation line; 20. Third ventilation valve; 21. Detailed Implementation

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0041] Example 1

[0042] refer to Figure 1-8 This embodiment provides a retrograde endotracheal intubation device that can improve glottic passage, including: an endotracheal tube body 1, an internal guide tube 2, a one-way locking mechanism 6, and a specially made traction guide wire 3;

[0043] The main body 1 of the endotracheal tube is a flexible hollow tube;

[0044] The built-in guide tube 2 is disposed inside the endotracheal tube body 1, and its distal end is provided with a variable diameter conical head 4, the top of which is provided with a central through hole 5.

[0045] The one-way locking mechanism 6 is disposed inside the variable diameter conical head 4 and is used to achieve one-way mechanical locking.

[0046] The specially designed traction guide wire 3 includes a wire body 7, and the middle section of the wire body 7 is provided with a traction protrusion 8;

[0047] The radial dimension of the traction protrusion 8 is smaller than the diameter of the central through hole 5.

[0048] During retrograde endotracheal intubation, a specially designed guide wire 3 is guided retrogradely through the airway to the nasal cavity or oral cavity via a cricothyroid membrane puncture needle. The guide wire is then passed through the internal guide stylet 2, which is then inserted into the endotracheal tube body 1. The endotracheal tube body 1 and the internal guide stylet 2 are then pushed into the patient's pharynx through the nasal cavity or oral cavity. When the endotracheal tube body 1 and the internal guide stylet 2 are advanced to the vicinity of the glottis, the specially designed guide wire is pulled from the patient's cricothyroid membrane. The traction protrusion 8 of the guide wire, as it passes through the variable-diameter conical head 4, will cause the variable-diameter conical head 4 to pass through the glottis, thereby guiding the endotracheal tube body 1 through the glottis.

[0049] The one-way locking mechanism 6 includes a plurality of elastic valves 9 inclined toward the proximal end of the tube core. One end of the elastic valve 9 is fixedly disposed inside the variable diameter conical head 4, and the other end faces the proximal end of the built-in guide tube core 2. The center of the through hole formed by the other end of the elastic valve 9 is on the same axis as the center of the central through hole 5.

[0050] When the special guide wire 3 is pulled, the traction protrusion 8 will be stuck in the through hole formed by the elastic valve 9 when it passes the variable diameter conical head 4 due to the one-way obstruction of the elastic valve 9. When the special guide wire is pulled, the variable diameter conical head 4 will move together with the special guide wire 3 and then pass through the glottis.

[0051] The one-way locking mechanism 6 also includes a plurality of springs 10, one end of which is fixedly connected to the inner wall of the variable diameter conical head 4, and the other end is fixedly connected to the elastic valve 9, and the spring 10 is in a compressed state.

[0052] Since the elastic valve 9 itself has a certain elasticity, it can return to its original shape. However, in order to better maintain the overall structure of the elastic valve 9, a spring 10 is set behind each valve to provide support for the elastic valve 9, which can effectively prevent the traction protrusion 8 from being pulled out from the inside of the variable diameter conical head 4.

[0053] The built-in guide tube 2 also includes a transition airbag 11, which includes a first airbag 12 and a second airbag 13. The first airbag 12 and the second airbag 13 are both located on the outside of the built-in guide tube 2. The first airbag 12 and the second airbag 13 are sequentially connected to a first ventilation tube 14. The first ventilation tube 14 is connected to a first ventilation valve 15. The first airbag 12 is located at the tail end of the variable diameter conical head 4. After inflation, the diameter of the first airbag 12 and the second airbag 13 does not exceed the outer diameter of the tracheal tube body 1.

[0054] A transition airbag 11 is provided at the tail end of the variable-diameter conical head 4. After the transition airbag 11 is inflated, it expands to fill the head of the endotracheal tube body 1. At the same time, another part of the transition airbag 11 is located inside the endotracheal tube body 1. After the transition airbag 11 expands, it fills the gap between the endotracheal tube body 1 and the outer side of the built-in guide tube 2. The friction between the transition airbag 11 and the inner wall of the endotracheal tube body 1 makes the two relatively fixed, so that the endotracheal tube body 1 can enter the airway through the glottis together with the built-in guide tube 2.

[0055] The traction protrusion 8 is spherical, with a maximum radial diameter of The diameter of the main body 7 of the filament is d; the maximum radial diameter of the traction protrusion 8 satisfies the condition that the diameter of the main body 7 of the filament satisfies the condition that the diameter of the traction protrusion 8 is d. And the traction

[0056] The variable-diameter tapered head 4 has a hardness gradient structure, with its Shore hardness gradually increasing from the distal tip to the proximal tip. The outer surface of the variable-diameter tapered head 4 is provided with a hydrophilic lubricating coating, and the Shore hardness of the variable-diameter tapered head 4 satisfies the following formula:

[0057]

[0058] in, 5 circles from the center of the through hole Hardness at that location The hardness at the center through hole 5 of the variable-diameter conical head 4. This represents the hardness increment coefficient. This design ensures strong compliance at the central through-hole 5 of the variable-diameter tapered head, while the tail of the variable-diameter tapered head 4 provides sufficient support.

[0059] The endotracheal tube body 1 includes a snap-fit ​​airbag 16, which is disposed on the inner wall of the endotracheal tube body 1 and connected to a second ventilation tube 17, which is connected to a second ventilation valve 18.

[0060] After the variable-diameter conical head 4 of the built-in guide tube 2 is in place, the snap-fit ​​airbag 16 is located in the gap between the first airbag 12 and the second airbag 13. At this time, the snap-fit ​​airbag 16 and the transition airbag 11 are inflated. When the built-in guide tube 2 is pulled by the special guide wire 3, the second airbag 13 will push the snap-fit ​​airbag 16 to move towards the glottis. At the same time, it can also push the endotracheal tube body 1 to move towards the glottis, so that the endotracheal tube body 1 and the built-in guide tube 2 pass through the glottis and enter the airway together.

[0061] The endotracheal tube body 1 also includes a blocking airbag 19, which is disposed on the outside of the endotracheal tube body 1 and connected to a third ventilation line 20, which is connected to a third ventilation valve 21.

[0062] The endotracheal tube body 1 has metal spiral reinforcing ribs embedded in its tube wall to enhance the overall structure's compressive strength and torque transmission performance.

[0063] The gap between the distal tip of the variable-diameter conical head 4 and the traction protrusion is no more than 0.1 mm, so as to ensure that the specially designed traction guide wire 3 can pass smoothly through the variable-diameter conical head 4 from the outside, and at the same time minimize the "step" at the end of the guide wire and the built-in guide tube core 2, forming a relatively continuous and smooth transition surface, and eliminating the step effect when the glottis passes through.

[0064] The specific procedure for endotracheal intubation using the retrograde endotracheal intubation device of the present invention, which improves glottic passage, is as follows:

[0065] S1. Perform cricothyroid membrane puncture on the patient. After the puncture is in place, insert the specially designed guide wire 3 into the patient's airway through the puncture needle, and exit one end of the specially designed guide wire 3 through the patient's nasal cavity or oral cavity.

[0066] S2. Pass the special traction guide wire 3 through the built-in guide tube 2. Since the maximum diameter of the traction protrusion 8 is smaller than the diameter of the central through hole 5, and the one-way locking mechanism 6 does not restrict the movement of the traction protrusion 8 when it enters the interior from the outside of the variable diameter tapered head 4, the entire special traction guide wire 3 can pass smoothly through the built-in guide tube 2.

[0067] S3. Pass the endotracheal tube body 1 through the built-in guide tube 2, and push the endotracheal tube body 1 and the built-in guide tube 2 simultaneously, so that the two move towards the glottis under the traction of the specially designed traction guide wire 3.

[0068] S4. When the variable diameter conical head 4 moves to the vicinity of the glottis, it inflates the first air bladder 12 and the second air bladder 13 through the first ventilation tube 14 and the first ventilation valve 15. After the first air bladder 12 is fully inflated, the part exposed outside the tracheal tube body 1 fills the irregular structure at the end of the tracheal tube body. At the same time, the second air bladder 13 is also filled with gas and expands, so that the built-in guide tube 2 and the tracheal tube body 1 form a relatively stable integral structure.

[0069] S5. Further, the snap-fit ​​airbag 16 can be inflated through the second ventilation line 17 and the second ventilation valve 18, causing the snap-fit ​​airbag 16 to expand. After the snap-fit ​​airbag 16 expands, it snaps between the first airbag 12 and the second airbag 13, thereby making the built-in guide tube 2 and the tracheal tube body 1 form a more stable overall structure.

[0070] S6. Pull the specially designed guide wire 3 from the cricothyroid membrane end so that the variable diameter conical head 4 sequentially drives the built-in guide tube 2 and the endotracheal tube body 1 through the glottis into the airway.

[0071] S7. Inflate the blocking airbag 19 through the third ventilation line 20 and the third ventilation valve 21 so that the position of the endotracheal tube body 1 in the airway is relatively fixed.

[0072] S8. The gas in the transition airbag 11 and the snap-fit ​​airbag 16 is released through the first ventilation line 14, the first ventilation valve 15, the second ventilation line 17, and the second ventilation valve 18, and the special guide wire 3 and the built-in guide core 2 are removed from the endotracheal tube body 1.

[0073] Example 2

[0074] like Figure 9 As shown, in this embodiment, the traction protrusion 8 is ellipsoidal.

[0075] Example 3,

[0076] like Figure 10 As shown, in this embodiment, the traction protrusion 8 is conical.

[0077] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A retrograde endotracheal intubation device that improves glottic passage, characterized in that, include: Endotracheal tube body, built-in guide tube, one-way locking mechanism, and specially designed guide wire; The main body of the endotracheal tube is a flexible hollow tube. The built-in guide tube is disposed inside the body of the endotracheal tube, and its distal end is provided with a variable diameter conical head, the top of which is provided with a central through hole; The one-way locking mechanism is disposed inside the variable diameter conical head and is used to achieve one-way mechanical locking; The specially designed traction guide wire includes a main body of wire, and a traction protrusion is provided in the middle section of the main body of wire; Wherein, the radial dimension of the traction protrusion is smaller than the diameter of the central through hole.

2. The retrograde endotracheal intubation device for improving glottic passage according to claim 1, characterized in that, The one-way locking mechanism includes multiple elastic valves that are inclined towards the proximal end of the tube core. One end of each elastic valve is fixedly disposed inside the variable diameter conical head, and the other end faces the proximal end of the built-in guide tube core. The center of the through hole formed by the other end of the elastic valve is on the same axis as the center of the central through hole.

3. The retrograde endotracheal intubation device for improving glottic passage according to claim 2, characterized in that, The one-way locking mechanism also includes multiple springs, one end of which is fixedly connected to the inner wall of the variable diameter conical head, and the other end is fixedly connected to the elastic valve, and the spring is in a compressed state.

4. The retrograde endotracheal intubation device for improving glottic passage according to claim 3, characterized in that, The built-in guide tube also includes a transition airbag, which includes a first airbag and a second airbag. The first airbag and the second airbag are both located on the outside of the built-in guide tube. The first airbag and the second airbag are sequentially connected to a first ventilation line. The first ventilation line is connected to a first ventilation valve. The first airbag is located at the tail end of the variable diameter conical head. There is a gap between the first airbag and the second airbag. The diameter of the first airbag and the second airbag after inflation does not exceed the outer diameter of the tracheal tube body.

5. The retrograde endotracheal intubation device for improving glottic passage according to claim 1, characterized in that: The traction protrusion is spherical, ellipsoidal, or conical, with a maximum radial diameter of The diameter of the main body of the filament is d The maximum radial diameter of the traction protrusion and the diameter of the main body of the filament satisfy the following condition: .

6. The retrograde endotracheal intubation device for improving glottic passage according to claim 1, characterized in that: The variable-diameter tapered head has a hardness gradient structure, with its Shore hardness gradually increasing from the distal tip to the proximal end. The outer surface of the variable-diameter tapered head is provided with a hydrophilic lubricating coating.

7. A retrograde endotracheal intubation device for improving glottic passage according to claim 4, characterized in that, The endotracheal tube body includes a snap-fit ​​airbag, which is disposed on the inner wall of the endotracheal tube body and connected to a second ventilation tube, which is connected to a second ventilation valve.

8. A retrograde endotracheal intubation device for improving glottic passage according to claim 7, characterized in that, The endotracheal tube body also includes a suffocating airbag, which is located on the outside of the endotracheal tube body and connected to a third ventilation line, which is connected to a third ventilation valve.

9. A retrograde endotracheal intubation device for improving glottic passage according to claim 1, characterized in that, The endotracheal tube body has metal spiral reinforcing ribs embedded in its wall to enhance the overall structure's compressive strength and torque transmission performance.

Images