Nasal cavity stent and series thereof

Abstract

The invention provides a nasal cavity stent and series thereof, the nasal cavity stent comprises a woven stent, the woven stent is of a cylindrical hollow structure, and the woven stent 1 is a cylindrical stent woven by multiple strands of NiTi memory alloy wires; a hollow channel is formed in the cylindrical support. And each NiTi memory alloy wire starts from the near-end binding part, is wound to the far-end closed part in a crossed manner according to a spiral manner, is bent to form a small circular ring and then is reversely wound back to the near-end binding part to form n wire end sets, and the n wire end sets are bound in the stainless steel terminal. Through the specific shape, size, characteristics and PPI gradual change and mutation design of the woven stent, the woven stent is attached to the anatomical structure of the human body, adaptive radial supporting force is provided for different anatomical parts so as to reduce mucous membrane stimulation, and the clinical supporting requirement is met.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and in particular provides a nasal stent and a series thereof. Background Art

[0002] Rhinitis, sinusitis, deviated nasal septum, and obstructive sleep apnea syndrome are common ENT clinical conditions with high prevalence rates, causing symptoms such as nasal congestion, headaches, and shortness of breath. Patients suffer from poor quality of life, and currently, no fundamental solution exists domestically or internationally. Traditional treatments, primarily medication and surgery, are ineffective and have high recurrence rates, creating a broad and demanding market.

[0003] Chronic rhinosinusitis is one of the most common otolaryngological diseases. According to epidemiological data in my country, approximately 16.3% of adults suffer from this condition, a higher incidence than arthritis and hypertension. Furthermore, there is evidence that the incidence of rhinosinusitis is increasing. While not life-threatening, chronic rhinosinusitis significantly impacts patients' quality of life. Beyond the known clinical symptoms of nasal congestion, headache, and runny nose, it can also lead to numerous functional and emotional impairments. Damage to the lower airway and the impact of chronic hypoxia on the cardiovascular system are also receiving increasing attention. Therefore, clinicians should pay close attention to this issue. Functional endoscopic sinus surgery is currently the mainstay of conservative treatment for chronic rhinosinusitis. Functional endoscopic sinus surgery aims to remove lesions within the nasal and sinus cavity while preserving the normal structure and mucosa of the nasal cavity and sinuses to the greatest extent possible, promoting good ventilation and drainage, and promoting the restoration of the morphology and physiological function of the nasal and sinus mucosa. However, clinically, nasal adhesions are a common complication after endoscopic sinus surgery, resulting in airflow obstruction at the affected area, persistent inflammation, and recurrence of the disease, causing significant pain for the patient. Therefore, nasal stents can provide a conservative treatment option for patients with rhinitis, nasal polyps, and turbinate hypertrophy by supporting the narrowed area and ensuring unobstructed drainage, thus avoiding surgical risks. Furthermore, nasal stents can be used for postoperative packing, exerting pressure to stop bleeding, ensuring ventilation, and avoiding complications of postoperative nasal adhesions.

[0004] In addition, endoscopic septal correction surgery is the primary treatment for septal deviation and one of the most common nasal surgeries. Given the unique physiology and anatomy of the nasal cavity and the specificities of endoscopic septal correction surgery, postoperative septal compression and support are necessary to stabilize the septum, prevent hematoma, re-deviation, and avoid complications such as nasal adhesions and stenosis. Reportedly, the incidence of septal perforation after septal correction is 2.1%, hematoma at 0.7%, and adhesion at 3.8%, with the incidence of small hematomas as high as 34.7%. The key to preventing postoperative complications is reducing the space between the nasal septum and mucosa. Commonly used methods include nasal packing, septal suturing, and septal splinting, but these often cause discomfort such as nasal congestion, dry mouth, and septal perforation. Nasal packing is currently the most commonly used postoperative treatment for septoplasty. Appropriate use of nasal packing can restrict the nasal septum and prevent postoperative complications such as septal hematoma, re-deviation, and nasal adhesions. Clinically, bilateral nasal packing with materials such as vaseline gauze or expanded sponge is typically left in place for 48 hours after septoplasty. However, nasal packing can cause a range of symptoms, such as nasal congestion, pain, headache, and epiphora. These symptoms are extremely uncomfortable and can severely impact patients' quality of life and increase the risk of infection. Nasal stents, on the other hand, can be used for postoperative packing in patients with structural nasal conditions such as septal deviation, middle turbinate bullae, and inferior turbinate hypertrophy. They support the nasal septum and inferior turbinate, reshape the septal cartilage, prevent postoperative bleeding and nasal adhesions, improve ventilation, minimize discomfort, and improve quality of life.

[0005] Secondly, sleep apnea syndrome (OSA) refers to episodes of sustained cessation of airflow through the mouth or nasal passages for more than 10 seconds, occurring more than 30 times within a 7-hour sleep period. Obstructive sleep apnea is primarily caused by obstruction or narrowing of the upper airway during sleep. Therefore, narrowing or obstruction anywhere from the anterior nares to the upper tracheal opening can lead to apnea. The main clinical manifestations are irregular snoring, recurrent episodes of apnea and arousal, significant daytime sleepiness, and memory loss. In severe cases, psychological, intellectual, and behavioral abnormalities may develop, and complications such as hypertension, stroke, myocardial hypoxia, and myocardial infarction may also occur. The most common and prominent feature of OSAS is snoring during sleep. The prevalence of severe OSAS (AHI ≥ 15 events per hour) in my country is approximately 3.4%, while the overall prevalence is 2% to 4% (28,000 to 26,000 people), and is trending upward, with a higher prevalence in men than in women. Combined with the pathogenesis of obstructive sleep apnea syndrome, the unique nasal stent design can provide a new solution for OSAS patients. It is lighter than CPAP, brings good sleep and improves mental state. Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a nasal stent and its series, which are designed with specific shapes, sizes, features and PPI gradients and mutations to fit the human anatomical structure, provide adaptive radial support force for different anatomical parts to reduce mucosal irritation, and meet clinical support needs.

[0007] To achieve the above purpose, the technical solution of the present invention is as follows: A nasal stent includes a braided stent. The braided stent is a cylindrical hollow structure, formed by braiding multiple strands of NiTi memory alloy wire into a cylindrical stent; a hollow channel is formed within the cylindrical stent. Braided stents of different sizes are woven to provide nasal support for different patients. The NiTi memory alloy, in this technical solution, utilizes its superelastic properties, namely its memory properties at room temperature. Before use, the stent is compressed into a delivery system's push tube and immediately deforms into an unloaded state upon being ejected from the push tube to achieve support.

[0008] The braided stent is divided into a nasal vestibule expansion portion, a nasal passage expansion portion, and a distal closure portion. The nasal vestibule expansion portion, the nasal passage expansion portion, and the distal closure portion are arranged in sequence. The nasal passage expansion portion is a hollow cylindrical stent. The nasal passage expansion portion is provided with a nasal vestibule expansion portion at one end. The nasal vestibule expansion portion is arched radially outward to form an ellipsoidal tube stent. The nasal passage expansion portion is provided with a distal closure portion at the other end. The distal closure portion is curved radially inward to form a trumpet-shaped stent. The nasal vestibule expansion portion, the nasal passage expansion portion, and the distal closure portion are arranged to fit the nasal cavity to achieve fitting support at multiple locations. The nasal vestibule expansion portion and the nasal passage expansion portion provide better contouring and fit, preventing the foreign body sensation and discomfort caused by traditional nasal packing and nasal airbag inflation support. The porous structure of the braided stent can also provide contouring and fit support.

[0009] One end of the nasal vestibule expansion portion tapers radially inward to form a proximal constriction. The proximal constriction is used to adjust the position of the nasal stent. The nasal stent also includes a stainless steel terminal, which fits within the proximal constriction. This allows for direct gripping of the stainless steel terminal to adjust the position of the nasal stent.

[0010] The distal end sealing portion is gradually reduced along the center of the cylindrical hollow structure of the braided stent to form a rounded corner of the distal end sealing portion. When the distal end sealing portion is extended into the nasal cavity or adjusted in position, the outer edge of the braided stent is prevented from scraping the inner wall of the nasal cavity.

[0011] The proximal constriction features an oblique opening, angled relative to the braided stent axis. This ensures the braided stent's support strength, while providing ventilation windows to enhance ventilation and effectively expel mucus and foreign matter from the nasal cavity. The oblique opening also facilitates insertion of forceps and tweezers into the nasal stent, facilitating precise tool adjustment.

[0012] The connection between the nasal vestibule expansion part and the proximal contraction part is provided with an opening, and there are two groups of openings, which are arranged at intervals and symmetrically along the central axis of the braided stent. The two groups of openings form a through channel, which is arranged radially along the braided stent. It is suitable for clinical scenarios where short-term support and dressing changes are required during the period. A series of nasal stents also includes stainless steel terminals that clamp the proximal end of the stent. The braided stent's multiple strands of NiTi memory alloy wire are braided in a single-press-one, single-press-two, or double-press-two configuration. The stainless steel terminals and different braiding methods create a diverse series to meet the needs of different patients.

[0013] The maximum outer diameter of the nasal vestibule expansion part is 12mm-18mm, and the long axis is 16mm-24mm; the mesh number PPI range of the nasal vestibule expansion part is 5-20; the maximum outer diameter of the middle nasal meatus expansion part is 8mm-12mm, and the length is 50mm-70mm, and it is integrally formed with the nasal vestibule expansion part; the mesh number PPI range of the middle nasal meatus expansion part is 4-16.

[0014] The nasal passage expansion section is composed of multiple braided segments of varying densities, with adjacent segments having different densities. These different densities provide varying support for the nasal vestibule and middle passage. Furthermore, by increasing the clearance between the ends and reducing the density, the end-to-end passability is improved, preventing nasal secretions from becoming clogged.

[0015] The nasal stent is a braided, multi-strand NiTi memory alloy wire twill weave. It exhibits excellent axial ductility while also providing radial support, ensuring that all parts of the nasal cavity conform to the stent. Furthermore, during nasal breathing, the stent can micro-move in accordance with the soft tissue of the nasal cavity, further addressing the shortcomings of traditional support tools.

[0016] The beneficial effects of the present invention are: The braided stent is a tubular structure that can be inserted through the nostrils. It is woven from NiTi memory alloy wires with a diameter of 0.05mm-0.2mm and is used for support in the nasal passages. The braided stent is made of n / 2 NiTi memory alloy wires that are cross-wound. Each NiTi memory alloy wire starts at the proximal constriction and spirally winds to the distal closed part. It bends to form a small loop and then reverses to the proximal constriction to form a collection of n wire ends, which are then confined to the stainless steel terminal. The present invention uses the specific shape, size, characteristics, and PPI gradient and mutation design of the braided stent to fit the human anatomy, provide adaptive radial support force for different anatomical sites, reduce mucosal irritation, and meet clinical support needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of the oblique opening and convergent O-shaped nasal stent of the present invention; Figure 2 A schematic diagram of the braiding pattern of the present invention; Figure 3 Schematic diagram of the centrally bunched M-shaped braided stent structure of the present invention; Figure 4 Schematic diagram of the structure of the double-opening D-shaped braided stent of the present invention; Figure 5 A schematic top view of the distal end of the obliquely opened and converged O-shaped nasal stent of the present invention; Figure 6 Schematic diagram of the PPI mutation of the braided scaffold in this application; Figure 7 for Figure 6 Schematic diagram of the segmented PPI mutation in the braided scaffold; In the figure: 1 braided stent; 2 stainless steel terminal; 11 nasal vestibule expansion part; 12 middle nasal meatus expansion part; 13 proximal constriction part; 14 distal closure part; n number of braided strands; a1 one-press-one braid; a2 one-press-two braids; a3 two-press-two braids. DETAILED DESCRIPTION

[0018] A nasal cavity stent includes a braided stent 1. The braided stent 1 is a cylindrical hollow structure. The braided stent 1 is braided from multiple strands of NiTi memory alloy wire to form a cylindrical stent; a hollow channel is formed in the cylindrical stent.

[0019] The braided stent 1 is divided into a nasal vestibule expansion portion 11, a nasal passage expansion portion 12 and a distal closing portion 14. The nasal vestibule expansion portion 11, the nasal passage expansion portion 12 and the distal closing portion 14 are arranged in sequence. The nasal passage expansion portion 12 is a hollow cylindrical stent. The nasal vestibule expansion portion 11 is provided at one end of the nasal passage expansion portion 12. The nasal vestibule expansion portion 11 is arched radially outward to form an ellipsoidal tube stent. The distal closing portion 14 is provided at the other end of the nasal passage expansion portion 12. The distal closing portion 14 is bent radially inward to form a trumpet-shaped stent.

[0020] One end of the nasal vestibule expansion portion 11 tapers radially inward to form a proximal converging portion 13. The distal closing portion 14 tapers along the center of the tubular hollow structure of the braided stent 1 to form a rounded corner of the distal closing portion. An oblique opening is provided on the proximal converging portion 13, and the oblique opening is arranged obliquely to the axis of the braided stent 1. An opening is provided at the connection between the nasal vestibule expansion portion 11 and the proximal converging portion 13, and the openings are provided in two groups, and the two groups of openings are arranged at intervals, and the two groups of openings are symmetrically arranged along the central axis of the braided stent 1, and the two groups of openings form a through channel, and the through channel is arranged radially along the braided stent 1.

[0021] A series of nasal stents also includes a stainless steel terminal 2, which is clamped with a proximal end constriction 13. The multiple strands of NiTi memory alloy wire of the braided stent 1 are braided in a one-press-one braid a1, a one-press-two braid a2, or a two-press-two braid a3.

[0022] The nasal vestibule dilator 11 has a maximum outer diameter of 12mm-18mm and a major axis of 16mm-24mm. The PPI of the nasal vestibule dilator 11 ranges from 5 to 20. The middle meatus dilator 12 has a maximum outer diameter of 8mm-12mm and a length of 50mm-70mm. It is integrally formed with the nasal vestibule dilator 11 and has a PPI of 4 to 16. The nasal meatus dilator 12 is divided into multiple braided segments of varying densities, with adjacent segments having different braid densities.

[0023] The braided stent 1 is made of multiple strands of NiTi memory alloy wire in a twill weave. The following is a detailed description of the braided stent and its series, including a braided stent, which is constructed as a tubular structure that can be inserted through the nostrils and is woven from NiTi memory alloy wire with a wire diameter of 0.05mm-0.2mm, for supporting the nasal passages; a stainless steel terminal for binding the wire ends of the braided stent; The braided stent includes a nasal vestibule expansion portion, which is used to support the nasal vestibule, expand outward in an ellipsoidal shape along the radial direction, and support the nasal septum; and a middle nasal meatus expansion portion, which is used to support the middle nasal meatus, expand outward in a cylindrical shape along the radial direction, and support the middle turbinate and inferior turbinate; and a proximal constriction portion, which is constructed as a collection of n (n=16 / 24 / 32 / 48 / 64 / 72) wire ends, which are constricted in the stainless steel terminal; and a distal closure portion, which is constructed as n / 2 (n=16 / 24 / 32 / 48 / 64 / 72) small rings evenly arranged, and expands axially toward the distal end.

[0024] The number of braided strands of the above-mentioned braided stent includes but is not limited to n=16 / 24 / 32 / 48 / 64 / 72. Different numbers of braided strands provide corresponding radial support forces. Under the same conditions, the radial support force is positively correlated with the number of braided strands. The braiding patterns of the above-mentioned braided stent include one-press-one braiding a1, one-press-two braiding a2, and two-press-two braiding a3. Different braiding patterns exhibit corresponding physical properties. Under the same conditions, the one-press-one-weave a1 exhibits high support and low compliance; the one-press-two-weave a2 exhibits medium support and medium compliance; the two-press-two-weave a3 exhibits low support and high compliance; the braided stent is formed by cross-winding n / 2 NiTi memory alloy wires, each NiTi memory alloy wire starting from the proximal end bundling portion, cross-winding to the distal end closed portion in a spiral manner, bending to form a small ring and then winding back to the proximal end bundling portion in the reverse direction to form a collection of n wire ends, which are bundled in the stainless steel terminal. There are no breakpoints between each NiTi wire, and there is no welding at the distal end closed portion, which can ensure that the braided stent segment is smooth and burr-free, avoiding nasal cavity damage; The maximum outer diameter of the above-mentioned nasal vestibule expansion part is 12mm-18mm, and the long axis is 16mm-24mm; due to the uneven diameter of the nasal vestibule expansion part, the PPI of the fixed-value weaving is uneven, and as the diameter increases, the PPI becomes smaller, so the PPI gradient is used to achieve uniform arrangement of the weaving mesh of the nasal vestibule expansion part, so that each cross-section in the nasal vestibule expansion part has the same radial support force to meet clinical needs; the weaving mesh number PPI of the nasal vestibule expansion part ranges from 5 to 20; the maximum outer diameter of the above-mentioned middle nasal meatus expansion part is 8mm-12mm, and the length is 50mm-70mm, and it is integrally formed with the nasal vestibule expansion part; different PPIs of each length segment of the middle nasal meatus expansion part are achieved through PPI mutation, so as to achieve different radial support force requirements of each length segment of the middle nasal meatus expansion part; the weaving mesh number PPI of the middle nasal meatus expansion part ranges from 4 to 16; combined Figure 3 The explanation is as follows: PPI directly affects the radial support force of the product. Different PPI designs should be selected based on the intended use of the product and the indications. Take this figure as an example: if the indication is nasal septum packing, the PPI of the nasal vestibule support is set to 18. Here, the radial force is greater, which can better support the nasal septum without deformation. In the case of no lesions in the nasal concha, the PPI of the nasal passage expansion is set to 8.7. Here, the radial force is smaller and only serves to limit and establish the channel. It can minimize the damage to human tissue and reduce pain while meeting the requirements of use.

[0025] The significance of the sudden and gradual PPI is that it allows for the design of different radial forces at different locations within the same stent, enabling precise control and enhancing efficacy at the lesion site while minimizing damage to the non-lesion site. This is different from conventional stents, which aim to balance two points, resulting in insufficient radial force at the lesion site or causing damage to the non-lesion site.

[0026] 1. The proximal constriction part has the following constriction modes: central constriction (M type), oblique opening constriction (O type) and double opening constriction (D type) to meet different clinical needs; one end of the nasal vestibule expansion part 11 gradually shrinks radially inward to form a proximal constriction part 13. The distal closing part 14 gradually shrinks along the center of the tubular hollow structure of the braided stent 1 to form a rounded corner of the distal closing part. The proximal constriction part 13 and the distal closing part 14 both adopt a central constriction mode to form a central constriction (M type). The proximal end of the central constriction (M type) has good radial support force and is suitable for short-term support of the nasal septum; the distal closing part has a rounded corner and ensures that it fits the nasal tissue, and both the proximal and distal ends improve support. The proximal constriction part 13 is provided with an oblique opening, which is inclined to the axis of the braided stent (1). The proximal radial support force of the oblique opening constriction (O type) is weak, but the opening is large, which is conducive to the discharge of purulent mucus and will not be blocked, and is suitable for long-term implantation. The connection between the nasal vestibule expansion portion 11 and the proximal constriction portion 13 is provided with an opening. There are two groups of openings, which are arranged at intervals and symmetrically along the central axis of the braided stent 1. The two groups of openings form a through channel, which is arranged radially along the braided stent 1. The double-opening constriction (D-type) ensures proximal radial support while leaving two small openings. Therefore, it is suitable for clinical scenarios where short-term support and dressing changes are required during the period. The fillet size of the connection between the above-mentioned central convergence (M type) and the nasal vestibule expansion part is 12mm-18mm; the opening diameter of the oblique opening convergence (O type) is 8mm-12mm; the opening diameter of the double opening convergence (D type) is 3mm-7mm; the distal closing part and the middle nasal meatus expansion part are integrally formed, and the fillet size of the distal closing part is 1.6mm-2.4mm, and the inner fillet size of the small ring is 0.5mm-1mm; the braided stent has but is not limited to combined post-processing methods such as drug loading, hydrophilic coating, and polishing coating.

[0027] The present invention relates to a nasal stent and its series, including a braided stent 1, which is constructed as a tubular structure that can be inserted through the nostrils. It is woven from NiTi memory alloy wires with a wire diameter of 0.05mm-0.2mm and is used for supporting the nasal passages. The braided stent is formed by cross-winding n / 2 NiTi memory alloy wires. Each NiTi memory alloy wire starts from a proximal end convergence part, cross-winds to a distal end closed part in a spiral manner, bends to form a small ring, and then reversely winds back to the proximal end convergence part to form a collection of n wire ends, which are converged in a stainless steel terminal 2.

[0028] The braided stent 1 has three braiding patterns: one-press-one braid (a1), one-press-two braid (a2), and two-press-two braid (a3). Different braiding patterns exhibit corresponding physical properties. Under the same conditions, the one-press-one braid (a1) exhibits high support and low compliance; the one-press-two braid (a2) exhibits medium support and medium compliance; and the two-press-two braid (a3) ​​exhibits low support and high compliance.

[0029] The number of braided strands of the braided stent 1 is not limited to n=16 / 24 / 32 / 48 / 64 / 72, and different numbers of braided strands provide corresponding radial support forces. Under the same conditions, the radial support force is positively correlated with the number of braided strands. The converging modes of the proximal converging portion 13 include central converging (M type), oblique opening converging (O type) and double opening converging (D type) to meet different clinical needs, wherein the fillet at the connection between the central converging (M type) and the nasal vestibule expansion portion 11 is 12mm-18mm; the opening diameter of the oblique opening converging (O type) is 8mm-12mm; and the opening diameter of the double opening converging (D type) is 3mm-7mm. The distal closure portion (14) is integrally formed with the middle nasal meatus expansion portion (12), and the fillet size of the distal closure portion (14) is 1.6mm-2.4mm, and the fillet size of the small ring is 0.5mm-1mm. The maximum outer diameter of the nasal vestibule expansion part (11) is 12mm-18mm, and the long axis is 16mm-24mm; the PPI gradient is used to achieve uniform arrangement of the weaving mesh of the nasal vestibule expansion part 11, so that each cross-section in the nasal vestibule expansion part 11 has the same radial support force to meet clinical needs; the PPI range of the weaving mesh of the nasal vestibule expansion part 11 is 5-20; the maximum outer diameter of the middle nasal meatus expansion part 12 is 8mm-12mm, and the length is 50mm-70mm, and it is integrally formed with the nasal vestibule expansion part 11; the different PPIs of each length segment of the middle nasal meatus expansion part 12 are achieved through PPI mutation, so as to achieve different radial support force requirements of each length segment of the middle nasal meatus expansion part 12; the PPI range of the weaving mesh of the middle nasal meatus expansion part 12 is 4-16.

[0030] in Figure 7 It is divided into 5 sections with different weaving densities. The specific requirements and effects are shown in the following table. Matters not covered by this invention are known in the art. The above embodiments are intended only to illustrate the technical concepts and features of this invention. Their purpose is to enable those skilled in the art to understand the contents of this invention and implement them accordingly. They are not intended to limit the scope of protection of this invention. Any equivalent changes or modifications made in accordance with the spirit and essence of this invention are intended to be covered by the scope of protection of this invention.

Claims

1. A nasal stent, characterized in that The invention comprises a braided support (1), which is a cylindrical hollow structure. The braided support (1) is formed by braiding multiple strands of NiTi memory alloy wires to form a cylindrical support; a hollow channel is formed in the cylindrical support.

2. A nasal stent according to claim 1, characterized in that The braided stent (1) is divided into a nasal vestibule expansion portion (11), a nasal passage expansion portion (12) and a distal closing portion (14). The nasal vestibule expansion portion (11), the nasal passage expansion portion (12) and the distal closing portion (14) are arranged in sequence. The nasal passage expansion portion (12) is a hollow cylindrical stent. One end of the nasal passage expansion portion (12) is provided with a nasal vestibule expansion portion (11). The nasal vestibule expansion portion (11) is arched outwardly in the radial direction to form an ellipsoidal tube stent. The other end of the nasal passage expansion portion (12) is provided with a distal closing portion (14). The distal closing portion (14) is bent inwardly in the radial direction to form a trumpet-shaped stent.

3. A nasal stent according to claim 1, characterized in that One end of the nasal vestibule expansion portion (11) tapers radially inward to form a proximal converging portion (13).

4. A nasal stent according to claim 3, characterized in that The distal end closing portion (14) is gradually contracted along the center of the cylindrical hollow structure of the braided stent (1) to form a distal end closing portion rounded corner.

5. A nasal stent according to claim 3, characterized in that The proximal end constricting portion (13) is provided with an oblique opening, which is arranged obliquely with respect to the axis of the braided stent (1).

6. A nasal stent according to claim 3, characterized in that An opening is provided at the connection between the nasal vestibule expansion portion (11) and the proximal contraction portion (13), and the openings are provided in two groups, the two groups of openings are arranged at intervals, the two groups of openings are symmetrically arranged along the central axis of the braided stent (1), and the two groups of openings form a through channel, which is arranged radially along the braided stent (1).

7. A series of nasal stents according to any one of claims 1 to 6, characterized in that It also includes a stainless steel terminal (2), which is clamped with a proximal end bundle (13), and the multiple strands of NiTi memory alloy wire of the braided stent (1) are braided in one-press-one pattern (a1), one-press-two pattern (a2), or two-press-two pattern (a3).

8. A nasal stent according to claim 1, characterized in that The maximum outer diameter of the nasal vestibule expansion part (11) is 12mm-18mm, and the long axis is 16mm-24mm; the PPI range of the nasal vestibule expansion part (11) is 5-20; the maximum outer diameter of the middle nasal meatus expansion part (12) is 8mm-12mm, and the length is 50mm-70mm, and it is integrally formed with the nasal vestibule expansion part (11); the PPI range of the middle nasal meatus expansion part (12) is 4-16.

9. A series of nasal stents according to claim 8, characterized in that The nasal passage expansion portion (12) is divided into a plurality of braided segments with different densities, and the braiding densities of adjacent braided segments are different.

10. A series of nasal stents according to claim 7, characterized in that The braided support (1) comprises multiple strands of NiTi memory alloy wires twill-woven.

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