Tracheal catheter structure with implantable stent

Abstract

The invention discloses a stent implantable tracheal catheter structure. The stent implantable tracheal catheter structure comprises a catheter for tracheal intubation, an expandable stent and a guide wire, the outer diameter of the conduit accords with the outer diameter of a standard conduit; at the beginning, the expandable stent is arranged in the catheter in a compressed state; the expandable stent clamps the guide wire, so that the guide wire drives the expandable stent to the outside of the catheter and is positioned at the front end of the catheter; when the expandable support is expanded outside the catheter, the maximum inner diameter of the expandable support is larger than the outer diameter of the catheter. The expandable stent from the catheter can be enlarged to expand the narrow part of the trachea, the narrow part of the trachea is expanded to a proper size, the catheter at the rear end is guided to pass through the narrow part, and the catheter air supply function is smoothly completed.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and more specifically, relates to a stent-implantable tracheal tube structure. Background Art

[0002] In clinical practice, we often encounter patients with giant goiters, giant thoracic or mediastinal tumors. These patients are often admitted to the hospital urgently due to dyspnea, but tumor surgery cannot be performed immediately due to its complexity. It is very dangerous for patients to be in a state of dyspnea before surgery, and urgent preoperative treatment is required, with ventilation problems being the priority.

[0003] Ventilation is an emergency treatment for patients with breathing difficulties. There are currently two options:

[0004] (1) Invasive tracheotomy

[0005] In the presence of tumor compression, emergency tracheotomy carries a huge risk. If the anatomical structure of the neck is unclear, the doctor cannot choose the appropriate incision, and there is a high possibility that the huge thyroid gland will be cut, causing heavy bleeding and unclear vision, making it impossible to proceed to the next step. Or, due to tumor compression, the tracheal cannula cannot be successfully implanted after tracheotomy.

[0006] (2) Non-invasive endotracheal intubation

[0007] The anesthesiologist inserts a breathing tube into the compressed trachea to maintain ventilation. Compared with invasive surgery, tracheal intubation is relatively safe in emergency situations, but there are still hidden dangers that cannot be ignored. Due to tumor compression, the patient's trachea is more likely to have symptoms of tracheobronchomalacia, and the diagnosis of tracheal chondromalacia usually requires a series of medical examinations and evaluations. After successful tracheal intubation, the conditions for diagnosing tracheal chondromalacia are no longer available during the operation; when the tumor is removed and the breathing tube is removed, it is very likely that the tracheal lumen will pathologically collapse due to tracheal cartilage softening, further compressing the airway space, and the patient will experience difficulty breathing again, or even endanger his life. Summary of the invention

[0008] In response to the above defects or improvement needs of the prior art, the present invention provides an implantable respiratory device with a stent, which can enlarge the expandable stent coming out of the catheter to expand the narrow part of the trachea, expand the narrow part of the trachea to an appropriate size, and guide the rear end of the breathing tube through the narrow part, thereby successfully completing the air delivery function of the breathing tube.

[0009] To achieve the above object, according to one aspect of the present invention, a stent-implantable tracheal tube structure is provided, comprising: a tube for tracheal intubation, an expandable stent, and a guide wire;

[0010] The outer diameter of the catheter complies with the outer diameter of a standard catheter;

[0011] Initially, the expandable stent is arranged in the catheter in a compressed state;

[0012] The expandable stent clamps the guide wire so that the guide wire drives the expandable stent out of the catheter and is located at the front end of the catheter;

[0013] When the expandable stent is expanded outside the catheter, the maximum inner diameter thereof is greater than the outer diameter of the catheter.

[0014] Preferably, in the stent-implantable tracheal tube structure, the expandable stent has an inner and outer double layer, each layer has parallel mesh strips, and the mesh strips of the inner layer and the mesh strips of the outer layer are staggered to form a mesh structure;

[0015] When the inner mesh strips of the expandable stent are in a compressed state and expanded, there are gaps between adjacent mesh strips for ventilation.

[0016] Preferably, in the stent-implantable tracheal catheter structure, when the outer mesh strips of the expandable stent are in a compressed state and expanded, there are gaps between adjacent mesh strips for ventilation; and the expandable stent when expanded is an annular mesh frame.

[0017] Preferably, in the implantable tracheal catheter structure, the inner mesh strips and the outer mesh strips are cylindrical strips, and the inner mesh strips and the outer mesh strips have a constriction portion at the staggered connection, and the length of the constriction portion limits the intersection angle of the inner mesh strips and the outer mesh, and when the intersection angle is minimum, the expandable stent is in a compressed state, and when the intersection angle is maximum, the expandable stent is expanded to have a maximum inner diameter.

[0018] Preferably, the stent-implantable tracheal catheter structure has an expandable stent arranged in a compressed state inside the catheter, distributed within a cylindrical surface with a diameter D1 ≤ 3 mm.

[0019] Preferably, in the stent-implantable tracheal catheter structure, the diameter D2 of the guide wire is ≤1 mm, and a scale is provided on the guide wire to facilitate the control of the depth of the catheter inserted into the trachea.

[0020] Preferably, the stent-implantable tracheal catheter structure further comprises a wire feeding mechanism, an inflation microtube, an expansion balloon and a three-way connector, wherein:

[0021] The guide wire is installed on the wire feeding mechanism for conveying the guide wire, and the inflatable microtube is fixedly connected to the guide wire;

[0022] The guide wire and the inflation microtube pass through the ports I and II of the three-way connector in sequence and enter the catheter so as to enter the human trachea. A rubber sealing ring is installed at the port I of the three-way connector to seal the guide wire and the inflation microtube at the port I of the three-way connector and prevent gas from leaking from the port I of the three-way connector. One end of the catheter is connected to the port II of the three-way connector.

[0023] One end of the inflation microtube is connected to the expansion balloon so that when the expansion balloon moves to the narrow part in the trachea, air is inflated into the expansion balloon to expand the expandable stent, so that the expanded expandable stent expands the narrow part in the trachea and loosens the guide wire, so that the catheter can pass through the expanded narrow part and facilitate the separation of the guide wire and the deflated expansion balloon from the expandable stent.

[0024] Preferably, in the stent-implantable tracheal tube structure, the expandable stent is made of memory metal;

[0025] The inflatable microtube includes a guide airbag and one end of an air delivery tube connected to the guide airbag, the other end of the air delivery tube is connected to the expansion airbag, and a one-way valve is arranged in the guide airbag;

[0026] Preferably, in the stent-implantable tracheal catheter structure, the expansion balloon has a first-level expansion state and a second-level expansion state; when the expansion balloon is in the first-level expansion state, the outer diameter of the expandable stent is the same as the outer diameter of the catheter; when the expansion balloon is in the second-level expansion state, the inner diameter of the expandable stent is larger than the outer diameter of the catheter.

[0027] Preferably, the stent-implantable tracheal tube structure further comprises a wire feeding mechanism and a three-way connector, wherein:

[0028] The guide wire is installed on the wire feeding mechanism for conveying the guide wire;

[0029] The guide wire passes through ports I and II of the three-way connector in sequence and then passes through the catheter to enter the trachea of ​​a human body. A rubber sealing ring is installed at port I of the three-way connector to seal the guide wire at port I of the three-way connector and prevent gas from leaking from port I of the three-way connector. One end of the catheter is connected to port II of the three-way connector.

[0030] The expandable stent has elastic force. Initially, the expandable stent is arranged in the catheter in a compressed state and is bound by the catheter. The expandable stent clamps the guide wire so that the expandable stent is moved outside the catheter by the guide wire and then expands, thereby expanding the narrow part of the trachea outside the catheter and loosening the guide wire, so that the catheter can pass through the narrow part of the expanded trachea and the guide wire can be separated from the expandable stent.

[0031] Preferably, in the stent-implantable tracheal catheter structure, the expandable stent comprises a compressible outer frame and a compression spring disposed in the outer frame, wherein the compression spring is used to expand the outer frame after the outer frame comes out of the catheter.

[0032] Preferably, in the stent-implantable tracheal tube structure, the III port of the three-way connector is connected to a simple respirator.

[0033] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0034] 1) The present invention provides a stent implantable tracheal catheter structure. Initially, a guide wire and a compressed expandable stent are installed inside the catheter. When a patient with a giant goiter or a giant tumor in the chest or mediastinum has difficulty breathing and needs to be intubated urgently, the guide wire inside the catheter can be used to guide the expandable stent inside to extend out of the catheter, stay in the narrow part of the trachea, and connect to the expansion airbag in a contracted state covered by the expandable stent. The expandable stent is expanded by inflating the expansion airbag, and the narrow part of the trachea is expanded to a suitable size by operating the expansion airbag. It is convenient for the rear end catheter to pass through the narrow part and smoothly complete the air delivery function of the catheter. After the operation, the catheter, guide wire, inflated microtube and deflated expansion airbag can be removed, and the expandable stent in the expanded state can be left in the trachea to prevent the pathological collapse of the tracheal lumen caused by softening of the tracheal cartilage, keep the trachea in an expanded state, and ensure the patient's normal breathing.

[0035] 2) The present invention provides a stent implantable tracheal catheter structure. Initially, a guide wire and a compressed expandable stent are installed inside the catheter. When a patient with a giant goiter or a giant tumor in the chest or mediastinum has difficulty breathing and needs emergency intubation, the guide wire inside the catheter can be used to guide the expandable stent inside to extend out of the catheter. The expandable stent itself has elasticity and automatically expands after exiting the catheter, staying in the narrow part of the trachea, expanding the narrow part of the trachea to a suitable size, making it convenient for the rear end of the catheter to pass through the narrow part, and smoothly completing the air delivery function of the catheter. After the operation, the catheter and guide wire can be removed, and the expandable stent in the expanded state can be left in the trachea to prevent the pathological collapse of the tracheal lumen caused by softening of the tracheal cartilage, keep the trachea in an expanded state, and ensure the patient's normal breathing. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of embodiment 1 of the present invention;

[0037] Figure 2 is a schematic diagram of embodiment 2 of the present invention;

[0038] Figure 3 Schematic diagram of the working process of Example 1 of the present invention;

[0039] Figure 4 is a partial side view of the expandable support frame of Example 1 of the present invention;

[0040] Figure 5 It is a partial schematic diagram of the cross section of the expandable stent according to Example 1 of the present invention.

[0041] In all the drawings, the same figure marks are used to represent the same elements or structures, among which: 1-wire feeding mechanism, 2-guide wire, 3-catheter, 4-expandable stent, 41 is the inner layer of the expandable stent, 42 is the outer layer of the expandable stent, 43 is the constriction part, 5-inflatable microtube, 6-expansion airbag, 7-three-way connector, 8-simple respirator, 9-trachea, 91-narrow part. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] The stent-implantable tracheal catheter structure provided by the present invention comprises: a catheter for tracheal intubation, an expandable stent, and a guide wire;

[0044] The outer diameter of the catheter used for endotracheal intubation conforms to the outer diameter of the standard catheter;

[0045] Initially, the expandable stent is arranged in a compressed state in the catheter; in order to prevent the risk of chondromalacia, the stent needs to be accurately implanted in the narrow part of the trachea where chondromalacia is most likely to occur, so the stent cannot increase the outer diameter of the catheter, and the outer diameter of the catheter also needs to match the outer diameter of the standard catheter of medical devices, so as not to cause difficulty in intubation in the part with a lower risk of chondromalacia due to the increase in outer diameter, and the inaccurate implantation position of the stent or the need to withdraw the stent, resulting in the failure of the catheter to pass the implantation. The outer diameter of the catheter is between 2.0mm and 10.0mm, of which the outer diameter of the catheter for adults is between 7.0 and 10.0mm, and the outer diameter of the catheter for children is between 2.0mm and 7.0mm. In the preferred embodiment, the expandable stent arranged in a compressed state in the catheter is distributed in a cylindrical surface with a diameter D1≤3mm.

[0046] The expandable stent clamps the guide wire so that the guide wire drives the expandable stent out of the catheter and is located at the front end of the catheter; the diameter D2 of the guide wire is ≤1mm, and a scale is set on the guide wire to facilitate the control of the depth of the catheter inserted into the trachea.

[0047] When the expandable stent is expanded outside the catheter, the maximum inner diameter thereof is greater than the outer diameter of the catheter.

[0048] The expandable stent has an inner and outer double layer, each layer has parallel mesh strips, and the mesh strips of the inner layer and the mesh strips of the outer layer are staggered to form a mesh structure; when the inner mesh strips of the expandable stent are in a compressed state and after being expanded, there are gaps between adjacent mesh strips for ventilation. When the outer mesh strips of the expandable stent are in a compressed state and after being expanded, there are gaps between adjacent mesh strips for ventilation; the expandable stent when expanded is a ring-shaped mesh frame. Tracheal intubation requires a certain amount of time, during which the patient's ventilation needs to be maintained as much as possible, so the trachea itself cannot block the airway and aggravate the condition. The present invention adopts the structure of a catheter-embedded stent to avoid the inaccurate stent implantation caused by the increase in the outer diameter of the catheter, but at the same time, attention should be paid to overcoming the problem of airflow blockage caused by the embedded stent. Therefore, in the preferred embodiment, the inner layer of the stent is between the outer layer and the guide wire. Since the outer layer of the expandable stent can effectively resist lateral pressure, it is ensured that gaps are maintained between adjacent mesh strips of the inner layer, so that ventilation can be maintained. Especially during implantation, an expansion balloon may be used to control the expandable stent for expansion. During the expansion process, the expansion balloon will cause a sharp increase in airflow resistance, and the process of adjusting the position of the stent during implantation may last for tens of seconds or even minutes. In this case, the ventilation performance of the expandable stent is necessary. Preferably, a ventilator is used for forward ventilation to overcome airflow resistance, improve patient discomfort caused by intubation, and increase the success rate of intubation. At the same time, a similar scheme can be used to design the outer layer of the expandable stent to improve ventilation performance, that is, when the outer layer mesh strips of the expandable stent are in a compressed state and after being expanded, there are gaps between adjacent mesh strips for ventilation. The expandable stent is a ring-shaped mesh frame when expanded.

[0049] Example 1

[0050] Reference Figure 1 A stent-implantable tracheal catheter structure includes a wire feeding mechanism 1, a guide wire 2, a catheter for tracheal intubation 3, an expandable stent 4, an inflatable microtube 5, an expansion balloon 6 and a three-way connector 7.

[0051] The guide wire 2 is installed on the wire feeding mechanism 1 for conveying the guide wire 2. The diameter D2 of the guide wire 2 is ≤ 1 mm. The gas-filled micro-tube 5 is fixedly connected to the guide wire 2. When the guide wire 2 moves, the gas-filled micro-tube 5 can be driven to move together. The wire feeding mechanism 1 can adopt an existing mechanism for conveying welding wire.

[0052] The guide wire 2 and the inflatable microtube 5 pass through the ports I and II of the three-way joint 7 in sequence and enter the catheter 3 so as to enter the human trachea 9. A rubber sealing ring is installed at the port I of the three-way joint 7 to seal the guide wire 2 and the inflatable microtube 5 at the port I of the three-way joint 7 and prevent gas from leaking from the port I of the three-way joint 7. One end of the catheter 3 is connected to the port II of the three-way joint 7; the ports I and II of the three-way joint 7 are preferably coaxially arranged to facilitate the movement of the guide wire 2 and the inflatable microtube 5; the center line of the port III of the three-way joint 7 is perpendicular to the center lines of the ports I and II, and the port III of the three-way joint 7 is preferably connected to a simple respirator 8. The breathing balloon on the simple respirator 8 is pinched by hand, the chest rises and falls symmetrically, and auscultation is performed with a stethoscope to determine whether the end of the catheter 3 is in the correct position in the trachea 9, and then mechanical ventilation is performed. The end of the guide wire 2 away from the wire feeding mechanism 1 is preferably a ball head or a round head to prevent cutting the human trachea 9.

[0053] The expandable support 4, such as Figure 4 , Figure 5 As shown, it is made of memory metal. Initially, the expandable stent 4 is arranged in the catheter 3 in a compressed state and wraps the expansion balloon 6 and clamps the guide wire 2, so that the guide wire 2 drives the expandable stent 4 and the expansion balloon 6 to move to the narrow part 91 of the trachea 9 outside the catheter 3; the expandable stent 4 arranged in the catheter 3 in a compressed state is distributed in a cylindrical surface with a diameter D1≤3mm.

[0054] The expandable support frame 4 has an inner and outer double layer, each layer has parallel mesh strips, the mesh strips of the inner layer 41 and the mesh strips of the outer layer 42 are staggered to form a mesh structure; when the mesh strips of the inner layer 41 of the expandable support frame are in a compressed state and after being expanded, there are gaps between adjacent mesh strips for ventilation, and when the mesh strips of the outer layer 42 of the expandable support frame are in a compressed state and after being expanded, there are gaps between adjacent mesh strips for ventilation; when expanded, the expandable support frame is a ring-shaped mesh frame. The mesh strips of the inner layer 41 and the outer layer 42 are cylindrical strips, and the staggered connection between the mesh strips of the inner layer 41 and the outer layer 42 has a constriction part 43, and the length of the constriction part 43 limits the intersection angle of the mesh strips of the inner layer 41 and the mesh strips of the outer layer 42. When the intersection angle is minimum, the expandable support frame 4 is in a compressed state, and when the intersection angle is maximum, the expandable support frame 4 is expanded to have a maximum inner diameter.

[0055] One end of the inflation microtube 5 is connected to the expansion balloon 6, so that when the expansion balloon 6 moves to the narrow part 91 in the trachea 9, the expansion balloon 6 is inflated to expand the expandable stent 4, so that the expanded expandable stent 4 expands the narrow part 91 in the trachea 9 and loosens the guide wire 2, so that the catheter 3 passes through the expanded narrow part 91 and the guide wire 2 and the deflated expansion balloon 6 are separated from the expandable stent 4. The expandable stent 4 in the expanded state is an annular grid, which supports the trachea 9 360 degrees in the circumferential direction, and the middle is an empty inner cavity, so that the guide wire 2 and the deflated expansion balloon 6 can be easily separated from the expandable stent 4 and pulled out.

[0056] Furthermore, the inflation microtube 5 includes a guide airbag and one end of an air delivery tube 9 connected to the guide airbag, the other end of the air delivery tube 9 is connected to the expansion airbag 6, and a one-way valve is arranged inside the guide airbag. The inflation microtube 5 uses a pipeline connected to a conventional catheter 3, and when the expansion airbag 6 needs to be deflated, the air delivery tube 9 can be cut off.

[0057] Reference Figure 3 , the following takes the stent implantable breathing tube with expansion balloon 6 as an example, and the method of using it is as follows:

[0058] 1) Insert the end of the breathing tube along the patient's alternate airway according to conventional non-invasive endotracheal intubation.

[0059] 2) The tip of the catheter 3 encounters a narrowed airway 91 caused by a huge goiter or a huge tumor in the chest or mediastinum, and the catheter 3 is difficult to be inserted further, so the insertion of the catheter 3 is suspended.

[0060] 3) Adjust the wire feeding mechanism 1 to the forward driving state to drive the wire forward.

[0061] 4) The wire feeding mechanism 1 drives the guide wire 2 to move forward and allows the end of the guide wire 2 to extend out of the catheter 3.

[0062] 5) The forward driving speed of the wire feeding mechanism 1 is set so that the guide wire 2 continues to extend forward and passes through the narrow part 91 of the trachea 9.

[0063] 6) Continue to drive the guide wire 2 to move the expandable stent 4 , and the expandable stent 4 comes out of the catheter 3 .

[0064] 7) Under observation by auxiliary equipment such as a laryngoscope, the guide wire 2 is adjusted to move forward or backward through the wire feeding mechanism 1 , and the guide wire 2 carrying the expandable stent 4 is positioned in the narrow area 91 .

[0065] 8) Inflate the expansion balloon 6 through the inflation microtube 5 to expand the expandable stent 4, and the expandable stent 4 expands the narrow part 91 of the trachea 9. Inflation continues until the narrow part 91 of the trachea 9 is expanded to an inner diameter larger than the outer diameter of the catheter 3.

[0066] 9) The balloon 6 is deflated to make way for the catheter 3, and then the catheter 3 is continuously advanced until the tip of the catheter 3 reaches a predetermined position in the trachea 9.

[0067] 11) The wire feeding mechanism 1 is driven in reverse to extract the guide wire 2, the inflatable microtube 5 and the deflated expansion balloon 6.

[0068] 12) Catheter 3 supplies air normally.

[0069] 13) Start the surgical procedure normally.

[0070] 14) After the operation is completed, the catheter 3 is removed.

[0071] 15) The expandable stent 4 in the expanded state remains in the trachea 9 .

[0072] 16) It is determined whether the expandable stent 4 in the expanded state needs to be removed according to subsequent inspection and evaluation. If the stent needs to be removed, the expandable stent 4 in the expanded state is removed using micro forceps according to conventional operations.

[0073] Example 2

[0074] Reference Figure 2 According to another aspect of the present invention, there is also provided a stent-implantable tracheal tube structure, characterized in that it comprises a wire feeding mechanism 1, a guide wire 2, a catheter for tracheal intubation 3, an expandable stent 4 and a three-way connector 7, wherein:

[0075] The guide wire 2 is installed on the wire feeding mechanism 1 for conveying the guide wire 2;

[0076] The guide wire 2 passes through the ports I and II of the three-way connector 7 in sequence and then passes through the catheter 3 to enter the trachea 9 of the human body. A rubber sealing ring is installed at the port I of the three-way connector 7 to seal the guide wire 2 at the port I of the three-way connector 7 and prevent gas from leaking from the port I of the three-way connector 7. One end of the catheter 3 is connected to the port II of the three-way connector 7.

[0077] The expandable stent 4 has elastic force. Initially, the expandable stent 4 is arranged in the catheter 3 in a compressed state and is bound by the catheter 3, and the expandable stent 4 clamps the guide wire 2 so that the expandable stent 4 is driven by the guide wire 2 to the outside of the catheter 3 and then expands, thereby expanding the narrow part 91 of the trachea 9 outside the catheter 3 and loosening the guide wire 2, so that the catheter 3 can pass through the narrow part 91 of the expanded trachea 9 and the guide wire 2 and the deflated expansion balloon 6 can be separated from the expandable stent 4.

[0078] After expansion, the expandable support frame 4 is a double-layer mesh structure, and there are gaps between adjacent mesh strips. The mesh strips of the inner layer 41 and the outer layer 42 are relatively fixed, and the expandable support frame 4 in the compressed state has gaps between adjacent mesh strips of at least the inner layer 41, so as to ensure that it still has the same performance even under lateral pressure, and cooperates with the ventilator for positive ventilation when necessary.

[0079] Furthermore, the expandable support 4 includes a compressible outer frame and a compression spring disposed in the outer frame, and the compression spring is used to expand the outer frame after the outer frame comes out of the catheter 3. The outer frame is a grid structure after being expanded.

[0080] In summary, the expandable stent 4 in a compressed state at the front end of the catheter 3 of the present invention can be made of memory metal, or can be a stent in a compressed state bound by the catheter 3 (similar to myelin binding). The expandable stent 4 of the present invention can be controllably expanded at the narrowed part 91 of the compressed trachea 9 and separated from the catheter 3 to form an implantable trachea 9 support member.

[0081] When the respiratory tube structure is removed, the expandable stent 4 in the expanded state still remains at the position where chondromalacia of the trachea 9 may occur. After further examination, the removal of the stent or maintaining the implanted state of the stent can be considered.

[0082] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stent-implantable tracheal tube structure, characterized in that: include: Catheters, expandable stents, and guidewires for endotracheal intubation; The outer diameter of the catheter conforms to the outer diameter of a standard catheter; Initially, the expandable stent is arranged in the catheter in a compressed state, and the expandable stent in the compressed state clamps the guide wire so that the guide wire drives the expandable stent to the outside of the catheter to expand and place the expandable stent at the front end of the catheter; When the expandable stent is expanded outside the catheter, its minimum inner diameter is greater than the outer diameter of the catheter, so that the catheter can pass through the expandable stent in the expanded state.

2. The stent-implantable tracheal tube structure according to claim 1, characterized in that: The expandable support frame has an inner and outer double layer, each layer has parallel mesh strips, and the inner layer mesh strips and the outer layer mesh strips are staggered to form a mesh structure; When the inner mesh strips of the expandable stent are in a compressed state and expanded, there are gaps between adjacent mesh strips for ventilation.

3. The stent-implantable tracheal tube structure according to claim 2, characterized in that: When the outer mesh strips of the expandable support are in a compressed state and expanded, there are gaps between adjacent mesh strips for ventilation; the expandable support when expanded is a ring-shaped mesh frame.

4. A stent-implantable tracheal tube structure according to any one of claims 2 or 3, characterized in that: The inner mesh strips and the outer mesh strips are columnar strips, and the inner mesh strips and the outer mesh strips have a constriction portion at the staggered connection. The length of the constriction portion limits the intersection angle of the inner mesh strips and the outer mesh. When the intersection angle is minimum, the expandable support bracket is in a compressed state, and when the intersection angle is maximum, the expandable support bracket is expanded to have a maximum inner diameter.

5. The stent-implantable tracheal tube structure according to claim 1, characterized in that: The expandable stent arranged in the catheter in a compressed state is distributed in a cylindrical surface with a diameter D1≤3mm.

6. The stent-implantable tracheal tube structure according to claim 1, characterized in that: The diameter D2 of the guide wire is ≤1 mm, and a scale is provided on the guide wire to facilitate the control of the depth of the catheter inserted into the trachea.

7. The stent-implantable tracheal tube structure according to claim 1, characterized in that: It also includes a wire feeding mechanism, an inflatable micro tube, an expansion air bag and a three-way joint, wherein: The guide wire is installed on the wire feeding mechanism for conveying the guide wire, and the inflatable microtube is fixedly connected to the guide wire; The guide wire and the inflation microtube pass through the ports I and II of the three-way connector in sequence and enter the catheter so as to enter the human trachea. A rubber sealing ring is installed at the port I of the three-way connector to seal the guide wire and the inflation microtube at the port I of the three-way connector and prevent gas from leaking from the port I of the three-way connector. One end of the catheter is connected to the port II of the three-way connector. One end of the inflation microtube is connected to the expansion balloon so that when the expansion balloon moves to the narrow part in the trachea, air is inflated into the expansion balloon to expand the expandable stent, so that the expanded expandable stent expands the narrow part in the trachea and loosens the guide wire, so that the catheter can pass through the expanded narrow part and facilitate the separation of the guide wire and the deflated expansion balloon from the expandable stent.

8. The stent-implantable tracheal tube structure according to claim 1, characterized in that: The expandable support is made of memory metal; The inflatable microtube comprises a guide airbag and one end of an air delivery tube connected to the guide airbag, the other end of the air delivery tube is connected to the expansion airbag, and a one-way valve is arranged in the guide airbag.

9. The stent-implantable tracheal tube structure according to claim 1, characterized in that: The expansion balloon has a first-level expansion state and a second-level expansion state; when the expansion balloon is in the first-level expansion state, the outer diameter of the expandable stent is the same as the outer diameter of the catheter; when the expansion balloon is in the second-level expansion state, the inner diameter of the expandable stent is greater than the outer diameter of the catheter.

10. The stent-implantable tracheal tube structure according to claim 1, characterized in that: It also includes a wire feeding mechanism and a three-way connector, wherein: The guide wire is installed on the wire feeding mechanism for conveying the guide wire; The guide wire passes through ports I and II of the three-way connector in sequence and then passes through the catheter to enter the trachea of ​​a human body. A rubber sealing ring is installed at port I of the three-way connector to seal the guide wire at port I of the three-way connector and prevent gas from leaking from port I of the three-way connector. One end of the catheter is connected to port II of the three-way connector. The expandable stent has elastic force. Initially, the expandable stent is arranged in the catheter in a compressed state and is bound by the catheter. The expandable stent clamps the guide wire so that the expandable stent is moved outside the catheter by the guide wire and then expands, thereby expanding the narrow part of the trachea outside the catheter and loosening the guide wire, so that the catheter can pass through the narrow part of the expanded trachea and the guide wire can be separated from the expandable stent.

11. The stent-implantable tracheal tube structure according to claim 10, characterized in that: The expandable stent comprises a compressible outer frame and a compression spring arranged in the outer frame, wherein the compression spring is used to expand the outer frame after the outer frame comes out of the catheter.

12. A stent-implantable tracheal tube structure according to any one of claims 7 to 11, characterized in that: The III port of the three-way connector is connected to a simple respirator.

Images