Patent Application
20240307173
The present application claims priority to patent application No. 202110051095.X filed with China National Intellectual Property Administration on Jan. 14, 2021 and entitled “BALLOON-EXPANDABLE INTERVENTIONAL VALVE STENT PROVIDED WITH FOLDABLE WINGSPAN SKIRT”, which is incorporated herein by reference in its entirety.
The present disclosure belongs to the field of medical devices, and particularly relates to a balloon-expandable interventional valve stent with a foldable wing-spreading skirt, which can be applied to aortic valve, pulmonary valve, mitral valve and tricuspid valve positions, damaged biological valve, valve in valve, and other scenarios.
Paravalvular leak (PVL), i.e., a leak formed between an artificial valve and surrounding tissues, is a common and serious complication in all heart valve surgeries, particularly the incidence of which is extremely high in transcatheter valve therapies that are currently becoming more prevalent. Several studies have shown that postsurgical paravalvular leaks are directly related to the degree of recovery, reoperation rate, hospital readmission rate, and early-, medium-, and long-term mortality of a patient. A meta-analysis of several international studies has shown that only 6%-59% of patients after the transcatheter aortic valve interventional surgery did not develop paravalvular leaks. In addition to unavoidable reasons such as the inability to remove the patient's original degenerated, decayed, or damaged valves, and the patient's own anatomical structures such as a non-circular valve annulus plane and other factors, the reasons for this are also closely related to the design characteristics of the current transcatheter valve interventional surgical equipment. With the popularization of transcatheter technology all over the world, more patients, especially younger patients, will choose transcatheter valve surgery to receive treatment, and the emergence of novel transcatheter valve interventional surgical equipment is imperative.
Currently, the existing balloon-expandable interventional valve is usually provided with a skirt on the outer side of an inflow channel, such as the artificial valve structure disclosed in Patent Document CN108430394A, and such structure is designed based on years of clinical experience, and it is considered that the paravalvular leak can be improved by increasing the contact area with the heart valve annulus plane. However, the existing valve structure still has a problem in that the effectiveness of paravalvular leak prevention is limited because the size of the valve delivery system cannot be made too large, resulting in the skirt not being able to be infinitely thickened. Therefore, there is a need for an interventional valve that can prevent the paravalvular leak without increasing the size of the valve delivery system.
Therefore, an object of the present disclosure is to provide a balloon-expandable interventional valve stent with a foldable wing-spreading skirt. According to a special design, a foldable wing-spreading skirt is arranged on an outflow channel of a stent, and the wing-spreading skirt can extend radially outwards from the stent to cover and occlude a paravalvular leak, so that adverse effects caused by the paravalvular leak are prevented.
The present disclosure is implemented by the following technical schemes:
According to the valve stent described herein, the pulling suture connected in the wing-spreading skirt is integrally in a plurality of continuous shapes like a Chinese character “ji (π)”, and the pulling suture is alternately arranged on an inner side and an outer side of the wing-spreading skirt for multiple times, such that the pulling suture on the inner side surface and the outer side surface of the wing-spreading skirt is in a dotted line shape; when the pulling suture is tensioned, the wing-spreading skirt folded in the axial direction of the stent main body is in a multi-layer fold shape, and the wing-spreading skirt in the folded state is in a wing-spreading shape outwards in the radial direction of the stent main body under the combined action of the expansion force of the balloon and the tension force of the pulling suture.
According to the valve stent described herein, the number of the pulling suture is 1, 2, 3, 4, 6, or 12, preferably 1, and the pulling suture continuously passes through a plurality of connecting points in the wing-spreading skirt and on the skirt of the inflow channel side.
According to the valve stent described herein, when there are 2 or more pulling sutures, the 2 or more pulling sutures described above have equal length to each other, are connected end to end in succession at the connecting points of the skirt on the inflow channel side, and jointly cover the whole circumference of the wing-spreading skirt.
According to the valve stent described herein, the wing-spreading skirt and the pulling suture are both made of a flexible non-metallic material.
According to the valve stent described herein, the pulling suture is made of a polymer material, preferably polyglycolic acid, polylactic acid, or poly(p-dioxanone).
The beneficial effects of the present disclosure are as follows:
The present disclosure has an advantage that the structure of the outflow channel is fully utilized, such that the wing-spreading skirt that can be used is increased on the premise of not increasing the diameter of a delivery system. For the paravalvular leak, such as a non-elliptical heart valve annulus, the wing-spreading skirt can provide a superior occlusion effect relative to the current prior art. Moreover, because of the use of flexible non-metallic materials, the additional structure does not increase damage to the heart.
The present disclosure will be further illustrated with reference to the following specific examples. It should be understood that these examples are merely intended to illustrate the present disclosure rather than limit the protection scope of the present disclosure. In addition, it should be understood that various changes or modifications may be made by those skilled in the art after reading the teachings of the present disclosure, and these equivalents also fall within the protection scope of the present disclosure.
As shown in
An inflow channel side of the stent main body 1 is also provided with a skirt (not shown in the figures), and the pulling suture 5 is connected to the outer skirt on the inflow channel side. There can be several pulling sutures 5, for example, 1, 2, 3, 4, 6, or 12 pulling sutures, preferably 1 pulling suture, and the pulling suture continuously passes through a plurality of connecting points 6 in the wing-spreading skirt 2 and on the outer skirt of the inflow channel 3 side; when there are 2 or more pulling sutures 5, the 2 or more pulling sutures 5 described above have equal length to each other, are connected end to end in succession at the connecting points 6, and jointly cover the whole circumference of the wing-spreading skirt 2.
When a balloon 7 is expanded and spread, two ends of the stent main body 1 are firstly spread, and the middle portion of the stent main body 1 is subsequently spread; when the stent main body 1 on the inflow channel side is spread, the skirt on the inflow channel side is unfolded, the pulling suture 5 connected to the skirt on the inflow channel side is gradually tightened in a circumferential direction under the action of an expansion force of the balloon, such that the pulling suture 5 in the wing-spreading skirt 2 on the outflow channel side is tensioned, causing the wing-spreading skirt 2 on the outflow channel side to be folded in an axial direction of the stent main body 1, the wing-spreading skirt 2 in the folded state presents a wing-spreading shape outwards in a radial direction of the stent main body 1 under the combined action of the expansion force of the balloon and the tension force of the pulling suture, and the skirt portion extending outwards in the radial direction can cover and occlude a paravalvular leak and integrally form the foldable wing-spreading skirt. The wing-spreading skirt 2 is made of a flexible non-metallic material, and the pulling suture 5 can be made of a polymer material such as polyglycolic acid, polylactic acid, poly(p-dioxanone), or the like.
As can be seen from
The embodiments of the present disclosure have been described above. However, the present disclosure is not limited to the embodiments described above. Any modification, equivalent, improvement, and the like made without departing from the spirit and principle of the present disclosure shall fall within the protection scope of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110051095.X | Jan 2021 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/137953 | 12/14/2021 | WO |
