Delivery device for iron-based alloy biodegradable endotracheal stent

Abstract

The utility model provides a delivery device for an iron-based alloy degradable endotracheal stent, including a mesh endotracheal stent and a stent delivery system; the mesh endotracheal stent includes an iron-based alloy matrix and a degradable polyester coated on the inner and outer surfaces of the stent, and the degradable polyester covers the stent surface in the form of a coating; the delivery system includes an outer sheath tube, an inner sheath tube and a guide wire; the outer sheath tube includes an outer sheath tube front end and an outer sheath tube tail end, the inner sheath tube is a pipeline structure, including a stent groove, an inner sheath tube plastic part, an inner sheath tube metal part, an inner sheath tube water injection port and a tube core, the tube core includes a fixing cap and a steel wire, one end of the steel wire is tightly connected to the plastic fixing cap, and the other end is inserted into the inner sheath tube through the front end of the inner sheath tube; the guide wire is a metal wire inserted through the front end of the inner sheath tube after the tube core is pulled out. The utility model degrades quickly in vivo, is firmly fixed, is not easy to shift, and is convenient for positioning.

Description

Technical Field

[0001] The utility model relates to the field of organ stent equipment, in particular to a conveying device for an iron-based alloy degradable tracheal stent. Background Art

[0002] Clinically, the incidence of tracheal malformations is high in children with congenital heart disease. According to literature reports, tracheal malformations account for about 12.9% of children with congenital heart disease. The incidence of congenital heart disease in my country is 0.7%-0.8%, and it increases by about 150,000 children each year. Among them, many children with congenital heart disease have tracheal malformations every year. The most common tracheal malformation is tracheal stenosis, and cardiovascular malformations are one of the reasons for the compression and softening of the trachea. Clinically, the treatment of tracheal stenosis in infants and young children is still a difficult problem. Currently, there are very few hospitals that can perform primary surgery for children with congenital heart disease and tracheal stenosis, and the postoperative recovery is poor.

[0003] Airway stenosis is generally divided into structural stenosis and functional stenosis. The former refers to the narrowing of the airway lumen caused by the growth and compression of various primary benign and malignant tumors and metastatic malignant tumors, while the latter often occurs in tracheomalacia. Surgery is the preferred treatment for tracheal stenosis, but longer tracheal lesions, tracheal stenosis or softening in some children, and most malignant airway lesions cannot be surgically removed. In addition to the inability of surgery to radically remove the trachea, during the process of tracheal reconstruction, when the length of tracheal resection in adults is greater than 50% and the length of tracheal resection in children is greater than 30%, excessive anastomotic tension will be generated, leading to surgical failure. The application of tracheal stents in clinical practice has achieved very good results. This technology has become an extremely important means of treating patients with inoperable airway stenosis. However, this technology still has a lot of room for development.

[0004] There are many types of stents:

[0005] 1. Silicone stents are more common and cannot shrink like metal stents, making them difficult to place and difficult to integrate into the airway, so they are prone to migration. At the same time, because silicone stents hinder the cleaning function of the airway mucosa, mucus retention will be relatively high.

[0006] 2. Metal stents have good support, large cross-sectional diameter, low stent displacement rate and radiopacity, and the procedure for metal stent implantation is relatively simple. However, non-degradable bare metal stents are highly irritating, resulting in a high risk of granulation tissue formation, making it difficult to recover the metal stent; to avoid granulation proliferation, the outer wall of the stent is often coated to form a covered stent. The use of covered stents will affect the ciliary activity and mucus clearance function of the respiratory tract, thereby causing blockage of airway secretions. At the same time, the displacement rate of the covered stent is high, but after long-term implantation, it is often easier to produce granulation tissue at the upper and lower ends of the covered stent, causing the trachea to narrow again and difficult to remove.

[0007] 3. 3D printed stents. With the development of 3D printing technology, it is now possible to produce patient-specific silicone stents through computed tomography, magnetic resonance imaging, etc. Individualized treatment is better than other stents, but due to material limitations, there are many disadvantages. The main limitation of 3D printed stents is that it usually takes several days to manufacture the stent, and it cannot be extended to emergency patients at present.

[0008] If ordinary stents are placed in the airway for more than 6 months, restenosis is prone to occur. Absorbable stents will degrade over time, avoiding complications caused by stent retention for too long or when removed, thereby reducing the risk of bleeding and infection. For children with tracheomalacia or tracheal stenosis, degradable stents are a more advantageous means. Commonly used degradable stents have a fast degradation rate, insufficient support, and poor tissue compatibility. Utility Model Content

[0009] In order to solve the problems of the prior art, the utility model provides a delivery device for an iron-based alloy degradable endotracheal stent, which degrades quickly in vivo, is firmly fixed, is not easily displaced, and is convenient to position.

[0010] The utility model provides a delivery device for an iron-based alloy degradable endotracheal stent, which is characterized by comprising a mesh endotracheal stent and a stent delivery system; the mesh endotracheal stent comprises an iron-based alloy matrix and a degradable polyester coated on the inner and outer surfaces of the stent, and the degradable polyester covers the surface of the stent in the form of a coating; the delivery system comprises an outer sheath tube, an inner sheath tube and a guide wire; the outer sheath tube comprises an outer sheath tube front end and an outer sheath tube tail end, the outer sheath tube front end is a transparent or translucent plastic pipe with a diameter larger than the shrunken mesh endotracheal stent, and the outer sheath tube tail end is fixedly connected to the inner sheath tube through a locking structure; the inner sheath tube is a pipeline structure, comprising a stent groove portion, an inner sheath tube plastic portion , an inner sheath tube metal part, an inner sheath tube water injection port and a tube core, the stent slot of the inner sheath tube includes a stent slot with the same length as the mesh tracheal stent; the inner sheath tube metal part is a metal tube embedded in the inner sheath tube, a front end silicone part and a rear end metal part, the front end silicone part is thinner than the rear end metal part, and the tail end of the inner sheath tube metal part is connected to the water injection port; the inner sheath tube plastic part is tightly connected to the stent slot, and the inner sheath tube plastic part is a plastic tubular structure with the same diameter as the rear end metal part; the tube core includes a fixing cap and a steel wire, one end of the steel wire is tightly connected to the plastic fixing cap, and the other end is inserted into the inner sheath tube through the front end of the inner sheath tube; the guide wire is a metal wire inserted through the front end of the inner sheath tube after the tube core is pulled out.

[0011] As a further improvement, the mesh tracheal stent is a Y-shaped mesh tracheal stent, comprising a stent main body, wherein the stent main body is connected to a left connecting part via a left stent part, and the stent main body is connected to a right connecting part via a right stent part.

[0012] As a further improvement, the diameter range of the main body of the stent is 4mm-12mm, with 2mm as a step, and the diameter range of the left and right sides of the stent is 3mm-9mm, with 2mm as a step.

[0013] As a further improvement, the left connecting part and the right connecting part are an integrated structure continued from the main body, which is located directly outside the bracket and has a width of 0.3 of the circumference of the bracket on the same side; the inner sides of the left bracket part and the right bracket part are not connected.

[0014] As a further improvement, the iron-based alloy comprises an alloy of pure iron and metallic manganese.

[0015] As a further improvement, the iron-based alloy stent is a bare stent woven from a single alloy metal wire and composed of a diamond-shaped grid structure, wherein the diamond-shaped grid structure is a large grid structure.

[0016] As a further improvement, the degradable polyester is degradable polylactic acid.

[0017] As a further improvement, the front end length of the outer sheath tube is 50 cm, and the outer sheath tube is provided with a colored scale ring with length marks of 10 mm, 20 mm, 30 mm, 40 mm, and 50 mm in sequence.

[0018] Further improvement, the locking buckle structure includes a first locking buckle, a second locking buckle and a connecting tube, the connecting tube connects the first locking buckle and the second locking buckle, the first locking buckle matches the threaded structure of the outer sheath tube through a threaded structure to fix the outer sheath tube, and the second locking buckle fixes the inner sheath tube through a threaded structure.

[0019] The utility model is mainly used in conjunction with a fiberoptic bronchoscope for tracheal CT examination, and includes the following steps:

[0020] 1. Determine the location and degree of tracheal stenosis and select the stent diameter and type.

[0021] 2. Use a fiberoptic bronchoscope to check and insert a guidewire with the fixed cap removed along the guidewire hole of the fiberoptic bronchoscope. Use the fiberoptic bronchoscope to confirm the insertion depth of the stent. Keep the guidewire in place and remove the fiberoptic bronchoscope.

[0022] 3. Tighten the second lock of the delivery system, pull out the inner sheath tube core, inject water into the inner sheath water injection hole, insert the guide wire through the front end of the inner sheath tube, and deliver the delivery system into the trachea according to the insertion depth;

[0023] 4. Loosen the second lock, fix the inner sheath so that there is no relative displacement between it and the human body, withdraw the outer sheath until the stent is released, and slowly withdraw the delivery system from the trachea.

[0024] 5. Use a fiberoptic bronchoscope to check the status of the stent and its supporting effect.

[0025] The beneficial effects of the utility model are:

[0026] 1. The corrosion rate of pure iron in the in vivo environment is slow, which cannot meet the clinical degradation time requirements for degradable stents, so it is necessary to increase the corrosion rate of iron. From the perspective of clinical application, when the absorbable implantable medical device has completed its intended use, the lesion site has healed and restored its normal morphology and function, the shorter the time for the device to be completely degraded and absorbed by the body, the better, without causing new biocompatibility issues. Depending on the different parts of the device in clinical application, it is generally believed that the healing period is 1-6 months, during which time the device needs to maintain structural integrity and sufficient mechanical properties. Iron-based alloys are used as the matrix material of implantable medical devices, with good biocompatibility, and iron ions help inhibit smooth muscle and promote endothelial cell growth, but iron-based alloys corrode slowly in the body, resulting in iron-based alloy devices still taking a long time to completely corrode after the healing period, so it is necessary to speed up its corrosion rate to shorten the corrosion cycle of iron-based alloys. Studies have shown that coating a degradable polyester coating on the surface of an iron-based alloy can increase its corrosion rate. The degradation of the degradable polyester coating in the body will cause the pH value of the local microenvironment near the device implantation site to decrease, forming a local slightly acidic environment. The iron-based alloy can corrode faster in this acidic environment to generate corrosion products such as iron salts and / or iron oxides and / or iron hydroxides.

[0027] 2. Existing studies have found that bare iron-based stents do not corrode or corrode slowly in animals for a long time, and their complete corrosion cycle may exceed 5 years, which cannot reflect the advantages of bioabsorbable stents. After the introduction of a degradable polymer coating on the surface of the stent, the acidic environment generated by the degradation of the polymer can promote the corrosion of iron, regulate the degradation behavior of the iron stent and shorten the entire degradation cycle. However, immediately after the stent is implanted, the degradable polymer coating begins to swell and hydrolyze, and the iron-based matrix immediately starts to corrode, which may cause the stent to lose effective support prematurely before the vascular remodeling is completed, and then cause restenosis. In order to ensure that the iron-based matrix does not start to corrode within a certain period of time (3 to 6 months) after implantation, so as to provide sufficient mechanical support for vascular repair, a manganese-containing protective layer is also introduced between the iron-based matrix and the degradable polymer layer. In addition, in order to match the degradation cycle of the degradable polymer and the consumption rate of the manganese-containing protective layer with the corrosion cycle of the iron-based matrix, so as to ensure that the iron-based matrix can provide sufficient radial support during the repair period and can corrode quickly after the repair period, the selection of degradable polymers is crucial. Parameters such as the type and molecular weight of the degradable polymer are key parameters affecting the consumption rate of the zinc-containing protector.

[0028] 3. The iron-based alloy stent is a bare stent made of a single alloy metal wire and composed of a diamond grid structure, wherein the diamond grid structure is a large grid structure. The bare stent is firmly fixed and not easy to shift.

[0029] 4. The diameter of the stent is serialized in a step-by-step manner, which is convenient for patients, especially children, to choose.

[0030] 5. The stent and the outer sheath of the delivery system are equipped with colored scale rings with length marks of 10mm, 20mm, 30mm, 40mm, 50mm, etc. for easy positioning.

[0031] 6. The Y-shaped stent can be equipped with two guide wires of different colors, which can accurately position and easily distinguish the left and right sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0034] Figure 2 This is a schematic diagram of the structure of the second embodiment of the utility model;

[0035] Figure 3 This is a schematic diagram of the structure of a Y-shaped mesh tracheal stent in the second embodiment of the present utility model;

[0036] Figure 4 This is a schematic diagram of the inner sheath structure in the second embodiment of the present utility model.

[0037] In the figure, there are a bracket main body 1, a left bracket part 2, a right bracket part 3, a left connecting part 4, a right connecting part 5, an outer sheath tube 6, an inner sheath tube 7, a tube core 8, a front end of an outer sheath tube 9, a rear end of an outer sheath tube 10, a connecting tube 11, a first locking buckle 12, a second locking buckle 13, a bracket groove 14, an inner sheath tube plastic part 15, an inner sheath tube metal part 16, an inner sheath tube water injection port 17, a steel wire 18, and a fixing cap 19. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] Embodiment 1

[0040] A delivery device for an iron-based alloy degradable endotracheal stent, the device comprising a mesh endotracheal stent and a stent delivery system, the delivery system comprising an outer sheath tube 6, an inner sheath tube 7, a tube core 8, and a guide wire.

[0041] The degradable mesh tracheal stent comprises an iron-based alloy matrix and a degradable polyester coated on the inner and outer surfaces of the stent, and the degradable polyester covers the surface of the stent in the form of a coating.

[0042] The iron-based alloy comprises an alloy composed of pure iron and metallic manganese.

[0043] The iron-based alloy stent is a bare stent woven from a single alloy metal wire and composed of a diamond-shaped grid structure, and the diamond-shaped grid structure is a large grid structure.

[0044] The mesh stent is an iron-based alloy stent with a diameter ranging from 3 mm to 12 mm in steps of 1 mm.

[0045] The degradable polyester coated on the inner and outer surfaces of the stent is polylactic acid.

[0046] The outer sheath tube 6 includes an outer sheath tube front end 7 and an outer sheath tube tail end 10. The outer sheath tube front end is a transparent or translucent plastic pipe with a length of 50 cm and a diameter larger than the contracted stent. The outer sheath tube is provided with a colored scale ring with length marks of 10mm, 20mm, 30mm, 40mm, 50mm, etc. in sequence.

[0047] The tail end of the outer sheath tube of the stent and delivery system includes a first locking buckle 12, a second locking buckle 13, and a connecting tube 11. The connecting tube connects the first locking buckle and the second locking buckle. The first locking buckle matches the threaded structure of the outer sheath tube through a threaded structure to fix the outer sheath tube, and the second locking buckle fixes the inner sheath tube through a threaded structure.

[0048] The inner sheath tube of the stent and delivery system includes a stent groove portion 14, an inner sheath tube plastic portion 15, an inner sheath tube metal portion 16, an inner sheath tube water injection port 17, and a tube core 18. The inner sheath tube is a pipeline structure. The inner sheath tube stent groove portion includes a front end silicone portion, a stent groove, and a rear end metal portion. The metal portion is a metal tube embedded in the inner sheath tube of the tube village, with a length of 3 mm. The thickness of the front end silicone portion is less than that of the rear end metal portion. The length of the stent groove is the length of the stent. The inner sheath tube plastic portion is tightly connected to the stent groove, and is a plastic tubular structure with the same diameter as the rear end metal portion, and is 30 cm in length. The rear end metal portion of the inner sheath tube is a tubular metal structure tightly connected to the inner sheath tube plastic portion, with the same diameter as the inner sheath tube plastic portion, and is 40 cm in length. The tail end of the metal portion of the inner sheath tube is connected to the water injection port.

[0049] The tube core comprises a fixing cap 19 and a steel wire 20. The length of the steel wire is 60 cm, one end of which is tightly connected to the plastic fixing cap, and the other end is inserted into the inner sheath tube through the front end of the inner sheath tube.

[0050] The guide wire is a metal wire that can be inserted through the front end of the inner sheath tube after the core tube is pulled out, and the length of the guide wire is 100 cm.

[0051] Embodiment 2

[0052] A delivery device for an iron-based alloy degradable endotracheal stent, such as Figure 2 As shown, the device includes a Y-shaped mesh tracheal stent and a stent delivery system, the Y-shaped mesh tracheal stent includes a stent body 1, a left stent portion 2, a right stent portion 3, a left connecting portion 4, and a right connecting portion 5, and the stent delivery system includes an outer sheath, an inner sheath, a core tube, and a guide wire.

[0053] The degradable Y-shaped mesh tracheal stent comprises an iron-based alloy matrix and a degradable polyester coated on the inner and outer surfaces of the stent, and the degradable polyester covers the surface of the stent in the form of a coating.

[0054] The iron-based alloy includes an alloy of pure iron and metallic manganese.

[0055] The iron-based alloy stent is a bare stent woven from a single alloy metal wire and composed of a diamond-shaped grid structure, and the diamond-shaped grid structure is a large grid structure.

[0056] The iron-based alloy bracket includes a bracket body, a left bracket part, a right bracket part, a left connecting part, and a right connecting part to form a whole. The diameter range of the bracket body is 4mm-12mm, with 2mm as a step. The diameter range of the left and right sides of the bracket is 3mm-9mm, with 2mm as a step.

[0057] The main body of the iron-based alloy bracket is connected to the left bracket part and the right bracket part through the left and right connecting parts respectively to form a Y-shaped bracket. The left and right connecting parts are an integrated structure continued from the main body. The structure is not a complete annular structure and is located on the outer side of the bracket. The width is 0.3 of the circumference of the bracket on the same side. In the inverted V-shaped structure between the left bracket part, the right bracket part and the bracket body, the inner sides of each are not connected. The left bracket part is black and the right bracket part is blue.

[0058] The inner and outer surfaces of the bracket are coated with degradable polylactic acid.

[0059] The stent and delivery system include an outer sheath, an inner sheath, and a core tube. The outer sheath includes an outer sheath front end and an outer sheath tail end. The outer sheath front end is a transparent or translucent plastic pipe with a length of 50 cm and a diameter of: (the diameter is larger than the contracted stent). The outer sheath is provided with a colored scale ring with length marks of 10mm, 20mm, 30mm, 40mm, 50mm, etc. in sequence.

[0060] The tail end of the outer sheath tube of the stent and delivery system includes a first locking buckle, a second locking buckle, and a connecting tube. The connecting tube connects the first locking buckle and the second locking buckle. The first locking buckle matches the threaded structure of the outer sheath tube through a threaded structure to fix the outer sheath tube. The second locking buckle is connected to the connecting tube through a threaded structure and fixes the inner sheath tube after tightening, so that the inner and outer sheath tubes will not move relative to each other.

[0061] The inner sheath tube of the stent and delivery system includes a stent groove, an inner sheath tube plastic part, an inner sheath tube metal part, an inner sheath tube water injection port, and a tube core. The inner sheath tube is a pipeline structure. The inner sheath tube stent groove includes a front end silicone part, a stent groove, and a rear end metal part. (The stent groove of the Y-shaped stent is an inverted V-shaped structure, which is connected with the inner sheath tube plastic part and constitutes a Y-shaped stent.) The metal part is a metal tube embedded in the inner sheath tube of the tube village, with a length of 3mm. The thickness of the front end silicone part is less than that of the rear end metal part. The length of the stent groove is the length of the stent. The plastic part of the inner sheath tube is tightly connected to the stent groove, and is a plastic tubular structure with the same diameter as the rear end metal part, and the length is 30cm. The rear end metal part of the inner sheath tube is a tubular metal structure tightly connected to the plastic part of the inner sheath tube, with the same diameter as the plastic part of the inner sheath tube, and the length is 40cm. The tail end of the metal part of the inner sheath tube is connected to the water injection port.

[0062] The tube core includes a fixing cap and a steel wire, the length of the steel wire is 60 cm, one end of which is tightly connected to the plastic fixing cap, and the other end is inserted into the inner sheath tube through the front end of the inner sheath tube (Y-shaped bracket, the tube core enters any front end opening of the inner sheath tube).

[0063] The guide wire is a metal wire that can be inserted through the front end of the inner sheath after the core tube is pulled out. The Y-shaped stent is provided with two guide wires, one guide wire is black and passes through the left stent part, and the other guide wire is blue and passes through the right stent part. The length of the guide wire is 100 cm.

[0064] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, the above is only a preferred implementation of the utility model. Since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field is within the technical scope disclosed by the utility model. For ordinary technicians in the technical field, changes or replacements that can be easily thought of should be included in the protection scope of the utility model without departing from the principle of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A delivery device for an iron-based alloy degradable endotracheal stent, characterized in that: It comprises a mesh tracheal stent and a stent delivery system; the mesh tracheal stent comprises an iron-based alloy matrix and a degradable polyester coated on the inner and outer surfaces of the stent, and the degradable polyester covers the surface of the stent in the form of a coating; the delivery system comprises an outer sheath tube, an inner sheath tube and a guide wire; the outer sheath tube comprises an outer sheath tube front end and an outer sheath tube tail end, the outer sheath tube front end is a transparent or translucent plastic pipe with a diameter larger than the shrunken mesh tracheal stent, and the outer sheath tube tail end is fixedly connected to the inner sheath tube through a locking structure; the inner sheath tube is a pipeline structure, including a stent groove portion, an inner sheath tube plastic portion, an inner sheath tube metal portion, an inner sheath tube water injection port and a tube core, the The stent groove portion of the inner sheath tube includes a stent groove with the same length as the mesh tracheal stent; the inner sheath tube metal portion is a metal tube embedded in the inner sheath tube, with a front end silicone portion and a rear end metal portion, the front end silicone portion is thinner than the rear end metal portion, and the tail end of the inner sheath tube metal portion is connected to a water inlet; the inner sheath tube plastic portion is tightly connected to the stent groove, and the inner sheath tube plastic portion is a plastic tubular structure with the same diameter as the rear end metal portion; the tube core includes a fixing cap and a steel wire, one end of the steel wire is tightly connected to the plastic fixing cap, and the other end is inserted into the inner sheath tube through the front end of the inner sheath tube; the guide wire is a metal wire that is inserted through the front end of the inner sheath tube and passes through the inner sheath tube after the tube core is pulled out.

2. The delivery device of the iron-based alloy degradable endotracheal stent according to claim 1, characterized in that: The mesh tracheal stent is a Y-shaped mesh tracheal stent, comprising a stent main body, wherein the stent main body is connected to a left connecting part via a left stent part, and the stent main body is connected to a right connecting part via a right stent part.

3. The delivery device of the iron-based alloy degradable endotracheal stent according to claim 2, characterized in that: The diameter of the main body of the stent ranges from 4mm to 12mm, with 2mm as a step, and the diameter of the left and right sides of the stent ranges from 3mm to 9mm, with 2mm as a step.

4. The delivery device of the iron-based alloy degradable endotracheal stent according to claim 2 or 3, characterized in that: The left connecting part and the right connecting part are an integrated structure continued from the main body, which is located directly outside the bracket and has a width of 0.3 of the circumference of the bracket on the same side; the inner sides of the left bracket part and the right bracket part are not connected.

5. The delivery device of the iron-based alloy degradable endotracheal stent according to claim 1, characterized in that: The iron-based alloy includes an alloy of pure iron and metallic manganese.

6. The delivery device of the iron-based alloy degradable endotracheal stent according to claim 1 or 5, characterized in that: The iron-based alloy stent is a bare stent woven from a single alloy metal wire and composed of a diamond-shaped grid structure, and the diamond-shaped grid structure is a large grid structure.

7. The delivery device of the iron-based alloy degradable endotracheal stent according to claim 1, characterized in that: The degradable polyester is degradable polylactic acid.

8. The delivery device of the iron-based alloy degradable endotracheal stent according to claim 1, characterized in that: The front end length of the outer sheath tube is 50 cm, and the outer sheath tube is provided with a colored scale ring with length marks of 10 mm, 20 mm, 30 mm, 40 mm, and 50 mm in sequence.

9. The delivery device of the iron-based alloy degradable endotracheal stent according to claim 1, characterized in that: The locking buckle structure includes a first locking buckle, a second locking buckle and a connecting tube. The connecting tube connects the first locking buckle and the second locking buckle. The first locking buckle matches the threaded structure of the outer sheath tube through a threaded structure to fix the outer sheath tube. The second locking buckle is connected to the connecting tube through a threaded structure and fixes the inner sheath tube after tightening.

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