Benign airway stent
By designing a benign airway stent with a polymer elastic membrane and a flared positioning structure, the problems of restenosis and instability caused by the existing stent in bronchodilation are solved, and the accurate positioning of the stent and normal ventilation of the lower bronchial are achieved.
Patent Information
- Application Number
- CN202421688595.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-16
AI Technical Summary
During the treatment process, the bare stent in existing bronchodilation can easily cause granulation to pass through the metal mesh and form restenosis. The membrane-containing stent is easily displaced on the bronchial, affecting positioning, and the coating may block the lower bronchial outlet, leading to complications.
A benign airway stent is designed, a cylindrical structure is used to design a stent body, a polymer elastic membrane is installed on the outer periphery, a gradually expanded flared positioning structure is installed on the proximal outer periphery, and a ventilation hole is opened at the ventilation port with the lower bronchial vent to ensure accurate positioning of the stent and prevent displacement.
The stent ensures stable positioning at the bronchial outlet through a flared positioning structure, and the ventilation hole ensures ventilation of the lower bronchial to avoid complications. At the same time, the polymer elastic membrane prevents granulation perforation and reduces the occurrence of restenosis.
Smart Images
Figure CN222899403U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, and particularly relates to a benign airway stent suitable for bronchiectasis and fistula occlusion. Background Art
[0002] In the prior art, when treating bronchial stenosis in patients with pulmonary tuberculosis and lung transplantation, metal stents are usually used, especially nitinol memory alloy medical stents. These medical stents have achieved good curative effects in clinical practice and have been more and more widely used in the past decade. However, during the treatment process of these bare stents, granulation will penetrate through the metal mesh holes to form restenosis. For this reason, there are currently membrane-covered medical cavity stents, which use a polymer elastic membrane attached to the mesh stent to prevent pathological tissues from growing into the cavity and have achieved good results in clinical use. However, the existing membrane-covered stents are prone to displacement when used in the bronchus, which is not conducive to stent positioning, and the membrane is easy to block the outlet of the lower-level bronchus, causing complications to the patient. Content of the Utility Model
[0003] Aiming at the deficiencies and defects of the prior art, the purpose of the utility model is to provide a benign airway stent, which can be accurately positioned on the bronchus to prevent displacement, and can also be used for the normal breathing of the lower-level bronchus to solve the above problems.
[0004] The technical problems solved by the utility model can be realized by adopting the following technical solutions:
[0005] A benign airway stent includes a stent body in a cylindrical structure. A polymer elastic membrane is arranged on the outer peripheral surface of the stent body. An expanding mouth positioning structure with a gradually increasing diameter from the distal end to the proximal end is arranged on the outer periphery of the proximal end of the stent body. The stent body and the polymer elastic membrane are provided with ventilation holes at positions corresponding to the ventilation ports of the lower-level bronchus.
[0006] In a preferred embodiment of the utility model, the aperture of the ventilation hole is 5-10 mm.
[0007] In a preferred embodiment of the utility model, a proximal drawstring is arranged on the expanding mouth positioning structure.
[0008] In a preferred embodiment of the utility model, a distal drawstring is arranged at the distal end of the stent body.
[0009] In a preferred embodiment of the utility model, at least one imaging marker is arranged on the stent body.
[0010] In a preferred embodiment of the utility model, four imaging markers are arranged on the stent body. The four imaging markers are distributed on the same radial section of the stent body, and the included angle formed by the connection lines of adjacent two imaging markers and the central axis of the stent body is 90°.
[0011] In a preferred embodiment of the present utility model, the developing mark includes a metal marker fixed on the support body.
[0012] In a preferred embodiment of the present utility model, the support body includes a grid structure formed by braiding nitinol wires.
[0013] In a preferred embodiment of the present utility model, the polymer elastic film includes a silica gel film.
[0014] Compared with the prior art, a benign airway stent of the present utility model is clamped at the outlet of the right upper lobe bronchus by means of a flared positioning structure, which is conducive to stent positioning. Moreover, the support body and the polymer elastic film are provided with ventilation holes at positions corresponding to the ventilation ports of the lower-level bronchi, enabling normal breathing of the lower-level bronchi without causing complications. In addition, the present utility model can also be provided with a pull rope to facilitate the removal of the stent after stenosis dilation or fistula healing. Furthermore, the present utility model can also be provided with a developing mark to ensure accurate positioning and improve the positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model.
[0016] Figure 2 It is Figure 1 the A-A cross-sectional view of
[0017] Figure 3 It is Figure 1 the B-B cross-sectional view of
[0018] Figure 4 It is a reference diagram of the use state of an embodiment of the present utility model.
[0019] Reference numerals: right upper lobe bronchus 10; outlet 11; lower-level bronchus 12; ventilation port 13; support body 100; polymer elastic film 200; flared positioning structure 110; ventilation hole 300; proximal pull rope 410; distal pull rope 420; developing mark 500. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The preferred embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present utility model more thorough and complete, and to convey the scope of the present utility model fully to those skilled in the art.
[0021] The terms used in the present utility model are for the purpose of describing specific embodiments only and are not intended to limit the present utility model. The singular forms "a", "said" and "the" used in the present utility model and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
[0022] It should be understood that although the terms "first", "second", "third", etc. may be used in the present utility model to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present utility model, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more unless otherwise specifically defined.
[0023] See Figures 1 to 4 As shown, a benign airway stent includes a stent body 100 in a cylindrical structure. In this embodiment, the stent body 100 includes a mesh structure formed by braiding nickel-titanium alloy wires. A polymer elastic membrane 200 is provided on the outer peripheral surface of the stent body 100. The polymer elastic membrane 200 can prevent granulation from passing through the mesh holes to form restenosis. The polymer elastic membrane 200 includes a silica gel membrane and may also be other membranes with good biocompatibility and corrosion resistance. An expanding mouth positioning structure 110 that gradually expands in diameter from the distal end to the proximal end is provided on the proximal outer periphery of the stent body 100. The expanding mouth positioning structure 110 is clamped at the outlet 11 of the right upper lobe bronchus 10 to facilitate stent positioning. Ventilation holes 300 are provided at positions corresponding to the ventilation openings 13 of the lower-level bronchus 12 on the stent body 100 and the polymer elastic membrane 200, so that the lower-level bronchus can breathe normally without causing complications.
[0024] In this embodiment, the aperture of the ventilation hole 300 is 5 - 10 mm, which is determined according to the wound opening condition of each patient. If the ventilation hole 300 is too small, ventilation will be unsmooth. If the ventilation hole 300 is too large, granulation on the side will grow into the ventilation hole 300, which is not conducive to the subsequent removal of the stent. The cross-sectional view of the ventilation hole 300 accounts for nearly half of the entire stent, that is, the ventilation hole 300 covers an arc length of almost 180°, ensuring smooth ventilation at the outlet 11 of the right upper lobe bronchus 10.
[0025] In order to facilitate the movement and recovery of the stent body 100, a proximal pull rope 410 is provided on the expanding mouth positioning structure 110, and a distal pull rope 420 is provided at the distal end of the stent body 100.
[0026] To ensure accurate positioning and improve the positioning accuracy, at least one imaging marker 500 is provided on the stent body 100. In this embodiment, four imaging markers 500 are provided on the stent body. The four imaging markers 500 are distributed on the same radial section of the stent body 100, and the included angle formed by the connecting lines of two adjacent imaging markers 500 and the central axis of the stent body 100 is 90°. The imaging marker 500 includes a metal marker fixed on the stent body 100, and the metal marker can be tantalum.
[0027] The working principle of the present utility model is as follows:
[0028] A benign airway stent of the present utility model is compressed in the delivery system. The proximal and distal ends of the stent are distinguished. Under the monitoring of X-ray or endoscope, the delivery system is advanced into the body along the guide wire to reach the lesion site. Using the markers on the delivery system, the positions of the ventilation holes 300 of the stent are corresponded. The handle of the delivery system is operated to release the stent. If the release position is inaccurate, the drawstring of the stent can be used for adjustment. When the stent is released in place, the flaring positioning structure 110 can be clamped at the outlet 11 of the right upper lobe bronchus 10, which is beneficial to stent positioning. The ventilation holes 300 correspond to the ventilation openings 13 of the lower-level bronchus 12, enabling the lower-level bronchus 12 to breathe normally without causing complications.
[0029] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0030] In the description of the present application, it should be understood that orientation terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" generally refer to the orientation or position relationship shown in the drawings. They are only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.
[0031] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations), and corresponding interpretations of the spatial relative descriptions used herein will be made.
[0032] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A benign airway stent, comprising a stent body in a cylindrical structure, wherein a polymer elastic film is disposed on the outer peripheral surface of the stent body, wherein: The proximal periphery of the stent body is provided with an expansion positioning structure which gradually expands in diameter from the distal end to the proximal end. The stent body and the polymer elastic membrane are provided with ventilation holes at positions corresponding to the ventilation openings of the lower bronchus.
2. A benign airway stent according to claim 1, characterized in that: The aperture of the vent hole is 5-10 mm.
3. A benign airway stent according to claim 1, characterized in that: The expansion positioning structure is provided with a proximal pull rope.
4. A benign airway stent according to claim 1, characterized in that: A distal pull rope is arranged at the distal end of the bracket body.
5. A benign airway stent according to claim 1, characterized in that: At least one developing mark is arranged on the bracket body.
6. A benign airway stent according to claim 5, characterized in that: The support body is provided with four developing marks, which are distributed on the same radial section of the support body, and the angle formed by the line connecting two adjacent developing marks and the central axis of the support body is 90°.
7. A benign airway stent according to claim 5 or 6, characterized in that: The development mark includes a metal marker fixed on the bracket body.
8. A benign airway stent according to claim 1, characterized in that: The stent body comprises a grid structure woven from nickel-titanium alloy wires.
9. A benign airway stent according to claim 1, characterized in that: The polymer elastic film includes a silicone film.