Self-expanding stent conveying assembly with standby air bag
By introducing spare airbags in the self -expand stent transportation component, the problem of poor expansion brackets in some parts and poor blood vessel wall stickers in some parts, achieve better wall effects and passability, improve the success rate of intervention surgery, And security.
Patent Information
- Application Number
- CN202420893000.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-27
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-04-27
AI Technical Summary
The existing self-expanding stents are not well attached to the blood vessel wall in some parts, resulting in poor passage and adhesion of the stent.
Design a self -expand stent transportation component with a spare airbag. The spare airbag is located on the inside of the self -expand stent and is less than half of the length of the self -expand bracket. It is inflated to the spare airbag through the airway to help the self -expansion bracket expand on the position of the unpotted wall position. , Improve the effect of paste wall with the blood vessel wall.
It improves the effects of the wall of the self -expand stent and the blood vessel wall, enhance the passability of the bracket and the stability of the paste, and reduce the incidence of thrombosis caused by the non -paste wall during the surgery and the narrow rate after the stent implantation.
Smart Images
Figure CN222398961U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a medical device used in an interventional surgery, in particular to a self-expanding stent delivery component with a spare air bag. Background Art
[0002] Stents are core medical devices in interventional surgeries such as angioplasty for intracranial artery stenosis, occlusion reopening, and assisted embolization of intracranial aneurysms. Different types of stents have different functions. Generally speaking, stents have the following functions, such as 1. Expanding the narrowed blood vessels; 2. Treating intracranial arterial dissections; 3. Treating mural thrombi and unstable plaques on the blood vessel walls; 4. Sealing the aneurysm opening to prevent the coils from escaping from the aneurysm opening when filling the aneurysm with coils, etc.
[0003] In terms of the release of the stent, the stent is divided into two types: self-expanding stent and balloon-released stent. The self-expanding stent refers to a super-elastic stent made of nickel-titanium super-elastic alloy through laser or weaving, which is delivered to the lesion site through a catheter. When the catheter is retracted, the stent is removed from the catheter, and the stent automatically expands using its own elasticity to achieve adhesion to the inner wall of the blood vessel; the balloon-released stent is a stent sleeve connected to a release balloon, and the length of the release balloon is longer than the stent. The stent is delivered to the lesion site using a catheter and a balloon. After the stent and the release balloon reach the lesion site, the catheter is retracted and the balloon is inflated to expand the stent to a state of adhesion to the inner wall of the blood vessel. The balloon is then deflated, and the diameter of the balloon becomes smaller, and the balloon can be withdrawn.
[0004] For a balloon-released stent, it has a release balloon that is longer than the stent. The release balloon itself is relatively hard, so its permeability is poor, which is not conducive to use in some distal narrow blood vessels and completely larger blood vessels. The self-expanding stent does not require a longer release balloon, so its permeability is relatively better, and it is easier to pass through narrow and curved blood vessels. Its application is increasing, but in the process of using the existing technology, it was found that the self-expanding stent relies entirely on its own elastic expansion to adhere to the wall, and its ends are prone to not adhering to the wall, and the middle of the stent sometimes does not adhere to the wall on the small curve side. Utility Model Content
[0005] The utility model aims to provide a self-expanding stent delivery component with a spare air bag which can improve the adhesion effect between the self-expanding stent and the inner wall of the blood vessel.
[0006] In order to solve the above technical problems, the technical solution of a self-expanding stent delivery assembly with a backup airbag in the utility model is as follows:
[0007] A self-expanding stent delivery assembly with a backup airbag comprises a self-expanding stent, a delivery catheter and a guide wire. The self-expanding stent delivery assembly also comprises a control catheter. The distal end of the control catheter is provided with a backup airbag located inside the self-expanding stent. The length of the backup airbag is less than half the length of the self-expanding stent. The control catheter is provided with an airway communicating with an inner hole of the backup airbag. The interiors of the control catheter and the backup airbag are provided with guidewire perforations for guiding the guide wire to pass through. A pushing portion for pushing the proximal end of the self-expanding stent is fixed on the control catheter at the proximal side of the backup airbag.
[0008] Furthermore, the length of the backup balloon is less than one third of the length of the self-expanding stent.
[0009] Furthermore, an annular retaining edge is fixed on the delivery catheter, and the pushing portion is formed by the distal end of the annular retaining edge.
[0010] Further, the airway is arranged in the inner wall of the control catheter.
[0011] Furthermore, the radial dimension of the annular retaining edge is smaller than the inner diameter dimension of the self-expanding stent after expansion.
[0012] Furthermore, the inflation pressure of the backup balloon is 2atm~3atm.
[0013] Furthermore, the self-expanding stent is a laser-engraved closed-loop stent or a braided closed-loop stent.
[0014] The beneficial effects of the present invention are as follows: the present invention improves the wall adhesion effect of the self-expanding stent by cooperating with a shorter backup airbag and the self-expanding stent. When in use, the backup airbag is located on the inner side of the self-expanding stent. The backup airbag is shorter (shorter than half the length of the self-expanding stent). Therefore, the backup airbag will not affect the permeability of the self-expanding stent. The backup airbag and the self-expanding stent are delivered to the lesion along the guide wire together. Then, the delivery catheter retreats toward the proximal side, and the self-expanding stent is removed from the distal end of the delivery catheter. Under the action of its own elastic force, the self-expanding stent expands and supports the lesion. If a certain part of the self-expanding stent is not well adhered to the blood vessel wall at the inner side of the lesioned blood vessel wall, the control catheter is moved to make the backup balloon correspond to the non-adherent part, and then the backup balloon is inflated through the airway. The backup balloon expands and expands the non-adherent part of the self-expanding stent, thereby improving the adhesion effect between the self-expanding stent and the blood vessel wall. It is expected to increase the possibility and safety of other tools passing through the self-expanding stent during surgery, improve the success and safety of stent insertion during surgery, reduce the incidence of thrombosis induced by stent non-adherence during surgery, and reduce the stenosis rate and long-term restenosis rate after implantation of the self-expanding stent. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:
[0016] Figure 1 is a schematic diagram of the state of the self-expandable stent in this embodiment when it has not fallen out of the delivery catheter;
[0017] Figure 2 is a schematic diagram of the state of the self-expandable stent after it is dislodged from the delivery catheter in this embodiment;
[0018] Figure 3 is a schematic diagram of the state of the backup airbag after expansion in this embodiment;
[0019] Figure 4 yes Figure 1 A in the enlarged view;
[0020] Explanation of the reference numerals: 1. blood vessel wall; 2. stenosis location; 3. delivery catheter; 4. backup airbag; 5. guide wire; 6. self-expanding stent; 7. annular retaining edge; 8. airway; 9. control catheter. DETAILED DESCRIPTION
[0021] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.
[0022] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.
[0023] The implementation example of a self-expanding stent delivery assembly with an expansion balloon in the utility model is as follows: Figures 1 to 4 As shown: it includes a delivery catheter 3, a guide wire 5 and a self-expanding stent 6. The self-expanding stent 6 is a laser-engraved closed-loop stent (or a braided closed-loop stent). The delivery catheter 3, the guide wire 5 and the self-expanding stent 6 all belong to the prior art and will not be described in detail here.
[0024] The self-expanding stent delivery assembly also includes a control catheter 9 located inside the delivery catheter 3. The distal end of the control catheter 9 is provided with a backup airbag 4 located inside the self-expanding stent when in use. The proximal end in this embodiment refers to the end close to the operator, and the distal end refers to the end away from the operator. The length of the backup airbag 4 is one-sixth to one-third of the length of the self-expanding stent 6. The control catheter is provided with an airway that communicates with the inner hole of the backup airbag. The outer wall of the backup airbag can also be provided with a drug coating.
[0025] The control catheter 9 and the backup airbag have guide wire holes for guiding and inserting the guide wire 5 . A pushing portion for pushing the proximal end of the self-expanding stent is fixed on the control catheter 9 at the proximal side of the backup airbag.
[0026] In this embodiment, an annular retaining edge 7 is fixed on the delivery catheter 3, and the annular retaining edge 7 cooperates with the delivery catheter to guide movement, and the pushing portion is formed by the distal end surface of the annular retaining edge 7. The airway 8 is arranged in the inner wall of the control catheter 9. The radial dimension of the annular retaining edge 7 is smaller than the inner diameter dimension of the self-expanding stent after expansion.
[0027] When in use, the guide wire is used to deliver the spare balloon and self-expanding stent to the lesion site. Figure 1 Item 1 in the middle represents the blood vessel wall, and item 2 represents the stenotic position of the blood vessel. The delivery catheter is then retracted toward the proximal end, and the self-expanding stent is exposed from the distal end of the delivery catheter. The self-expanding stent automatically expands under its own elasticity and contacts the blood vessel wall at the stenotic position. The self-expanding stent is provided with a mark visible through X-rays. If the self-expanding stent can contact the blood vessel wall well, the backup airbag does not need to be used. If a certain position of the self-expanding stent cannot contact the blood vessel wall well, the position of the airbag is moved by moving the control catheter so that the backup airbag corresponds to the position of the self-expanding stent that is not attached to the wall. Then the surgeon uses an external air pump to ventilate the backup airbag through the airway, such as Figure 3As shown, the backup airbag expands, and the backup airbag expands the self-expanding stent to ensure good contact between the self-expanding stent and the blood vessel wall. The backup airbag in the utility model is completely different from the release balloon in the prior art. The two have essential differences, which are mainly reflected in: 1. The release balloon in the prior art is longer than the stent, and its passability is poor. The backup airbag in the utility model is shorter and has better passability (better performance in passing through narrow blood vessels and curved positions); 2. The release balloon in the prior art must be used to expand the stent by releasing the balloon, but in the utility model, the backup airbag does not have to work. Only when the self-expanding stent is not attached to the blood vessel wall, the backup airbag is required to work; 3. The backup airbag in the utility model can move axially relative to the self-expanding stent to select the non-attached position of the self-expanding stent to expand and adhere to the wall. The expansion pressure of the backup balloon is 2atm~3atm, that is, the backup balloon can be expanded by injecting 2atm~3atm of pressure into the backup balloon, and the expansion pressure is also less than the expansion pressure of the release balloon in the prior art.
[0028] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in this utility model according to the specific circumstances.
[0029] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.
[0030] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.
[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A self-expanding stent delivery assembly with a backup balloon, comprising a self-expanding stent, a delivery catheter and a guide wire, characterized in that: The self-expanding stent delivery assembly also includes a control catheter, a backup airbag located inside the self-expanding stent is provided at the distal end of the control catheter, the length of the backup airbag is less than half the length of the self-expanding stent, an airway communicating with the inner hole of the backup airbag is provided on the control catheter, the interior of the control catheter and the backup airbag has a guide wire perforation for guiding the guide wire to pass through, and a pushing portion for pushing the proximal end of the self-expanding stent is fixed on the control catheter at the proximal side of the backup airbag.
2. The self-expanding stent delivery assembly according to claim 1, characterized in that: The length of the backup balloon is less than one-third of the length of the self-expanding stent.
3. The self-expanding stent delivery assembly according to claim 1, characterized in that: An annular retaining edge is fixed on the delivery catheter, and the pushing portion is formed by the distal end of the annular retaining edge.
4. The self-expanding stent delivery assembly according to claim 1, characterized in that: An airway is disposed in the inner wall of the control catheter.
5. The self-expanding stent delivery assembly according to claim 3, characterized in that: The radial dimension of the annular retaining edge is smaller than the inner diameter dimension of the self-expanding stent after expansion.
6. The self-expanding stent delivery assembly according to claim 1, characterized in that: The inflation pressure of the backup airbag is 2atm~3atm.
7. The self-expanding stent delivery assembly according to any one of claims 1 to 6, characterized in that: The self-expanding stent is a laser engraved closed-loop stent or a braided closed-loop stent.