Valve stent and heart valve prosthesis prosthesis

Abstract

The invention relates to the technical field of medical instruments, in particular to a valve stent and an artificial heart valve prosthesis. Comprising a positioning air bag and a valve support, the positioning air bag is installed in the valve support, clamping petals are installed in the valve support and arrayed in the valve support, locking petals are arranged on the positioning air bag, locking through holes are formed in the locking petals, the locking through holes are formed in the clamping petals, and the clamping petals are arranged on the positioning air bag. The positioning air bag is contracted to enable the locking valve to drive the clamping valve to contract, so that the valve stent is contracted, and repositioning is facilitated; a sealing air bag is further arranged outside the valve support, and the sealing air bag is used for completely sealing the valve support to cover perivalvular leakage and backflow areas, so that the perivalvular leakage and backflow conditions are prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a valve stent and an artificial heart valve prosthesis. Background Art

[0002] A valve stent is a medical device used to treat heart valve disease. It is usually made of metal or plastic material and designed in the shape of a stent. It can support and keep the heart valve open to improve blood flow. Valve stents are often used to treat aortic valve stenosis or regurgitation. The stent is implanted into the heart through minimally invasive surgery to replace or repair the damaged valve. This treatment method is called transcatheter aortic valve replacement (TAVR), which is a newer treatment technology. Compared with traditional open-chest surgery, it has the advantages of less trauma and faster recovery. However, the existing valve stents may cause paravalvular leakage or regurgitation due to inaccurate fixing positions or insufficient sealing with the surrounding tissues of the heart, which may greatly damage the patient's health. At the same time, if the existing inaccurate positioning is discovered during surgery, the valve stent usually needs to be removed and repositioned, which will increase the difficulty of the operation and reduce the efficiency of the operation.

[0003] Therefore, the present invention designs a valve stent and an artificial heart valve prosthesis to solve the above-mentioned technical problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing valve stent may cause paravalvular leakage or regurgitation due to inaccurate fixing position or insufficient sealing with the surrounding tissues of the heart, which may greatly damage the patient's health. At the same time, if the existing inaccurate positioning is discovered during the operation, the valve stent usually needs to be removed and repositioned. This method will increase the difficulty of the operation and reduce the efficiency of the operation.

[0005] The present invention provides the following technical solutions: a valve stent, comprising a positioning balloon and a valve stent, wherein the positioning balloon is installed inside the valve stent, a clamping flap is installed inside the valve stent, the clamping flap array is inside the valve stent, a locking flap is arranged on the positioning balloon, a locking through hole is opened on the locking flap, the locking through hole is installed on the clamping flap, the positioning balloon contracts to cause the locking flap to drive the clamping flap to contract, thereby contracting the valve stent for easy repositioning; a sealing balloon is also arranged outside the valve stent, and the sealing balloon is used to completely seal the valve stent to cover the paravalvular leakage and regurgitation areas, thereby preventing the occurrence of paravalvular leakage and regurgitation.

[0006] Preferably, the valve stent includes a supporting portion and a folding portion, and the supporting portion is a mesh structure; the supporting portion of the mesh structure is used to achieve the folding and contraction effect of the valve stent; the folding portion is installed between the supporting portions, and the folding portion is used to link with the positioning airbag through a clamping flap, that is, the positioning airbag pulls the folding portion by expansion, and then the folding portion pulls the supporting portion to contract or unfold; the folding portion is a V-shaped structure, and the folding portion of the V-shaped structure is used to achieve its rapid folding or unfolding effect; and a locking flap is installed in the middle position of the folding portion, which is used to be fixed with the clamping groove of the supporting portion, so as to achieve stable expansion of the valve stent when the clamping groove and the folding portion are clamped, so as to cooperate with the heart valve to achieve stable work inside the heart.

[0007] Preferably, the locking flap is L-shaped and the starting direction of the locking flap is in the opposite direction of the forward movement of the transport catheter. Pointing the locking flap in the opposite direction to the forward movement is used to better enable the positioning airbag to push the locking flap forward during the process of the positioning airbag driving the valve stent forward. At the same time, after the positioning is completed, the positioning airbag can be directly pulled to make the locking flap quickly detach from the positioning flap and then detach from the valve stent to complete the installation of the valve stent.

[0008] Preferably, the supporting portion is provided with a clamping groove which is clamped with the folding portion, and the clamping groove is used to clamp the folding portion, so that the folding portion can play an overall supporting effect on the entire valve stent after the valve stent is fully unfolded. At the same time, this clamping method can be used without interfering with the adjustment effect of the folding portion during adjustment. In the process of unfolding and positioning the valve stent, it cooperates with the positioning airbag, that is, the positioning airbag expands to gradually unfold the folding portion until the folding portion is clamped into the clamping groove. At this time, the entire valve stent is in a stable state, and the valve stent is ensured not to shrink in the absence of external force pulling at the same time, thereby ensuring the service life of the valve stent.

[0009] Preferably, the sealing airbag is a double-layer structure, which includes a supporting airbag and an external airbag; an inflation hole is provided in the supporting airbag, and the supporting airbag is used to be inflated to ensure the sealing effect of the sealing airbag; an inflation nozzle is provided in the positioning airbag, and the inflation nozzle is used to inflate air into the supporting airbag; the inflation nozzle is inserted into the inflation hole in the initial state, and a sealing gasket is provided in the inflation hole, and the sealing gasket is used to seal the supporting airbag after the inflation nozzle is inflated and withdrawn.

[0010] Preferably, the circular array of sealing gaskets is inside the inflation hole, and the sealing gaskets are used to seal the inflation hole; and each of the sealing gaskets is provided with an extended sealing portion, and the extended sealing portion is used to further consolidate the sealing of the sealing gasket, and each extended sealing portion is connected to an adjacent sealing gasket; when an inflation nozzle is inserted, the sealing gasket is in an open state, and when the inflation nozzle is pulled out, due to the existence of the extended sealing portion and the air pressure in the airbag, the sealing gaskets are interlocked with each other, thereby avoiding the escape of gas and ensuring the sealing of the sealed airbag.

[0011] Preferably, the cross-section of the support airbag is a star-shaped structure, and the four corners of the support airbag are connected to the external airbag. The star-shaped sealing airbag is used to drive the external airbag to expand when it is expanded, thereby better achieving the sealing effect of the sealing airbag. At the same time, it is also more convenient to set a diversion channel in the external airbag to further avoid blood reflux. At the same time, under the action of the star-shaped airbag, the sealing airbag can drive the valve stent to be better clamped inside the heart.

[0012] Preferably, a first guide hole is provided at the top of the external airbag, a second guide hole is provided in the supporting airbag, a third guide hole is provided at the bottom of the external airbag, a first guide hole is provided in the external airbag for collecting refluxed blood, the second guide hole is used to direct the blood from the upper part of the external airbag to the lower part of the external airbag, and out through the third guide hole, and the outflowing blood flows to the whole body through the heart valve along with the next round of blood pumping.

[0013] Preferably, a sealing cover is provided outside the third flow guide hole, and a pressure plate is provided on the sealing cover, the sealing cover is used to seal the third flow guide hole, under the action of the sealing cover, the third flow guide hole is in a normally closed state, and the sealing cover is made of soft material, that is, it can be turned around one side, and an elastic line is provided on the other side of the sealing cover, which can ensure that the sealing cover is normally closed under normal conditions, and the pressure plate is provided on the sealing cover so that the blood can apply pressure to the pressure plate when blood is pumped, so that the sealing cover is opened, and then the refluxed blood can flow to the whole body again along with the pumped blood, and the sealing cover is closed when there is no blood pumping, so as to avoid the phenomenon of blood reflux.

[0014] An artificial heart valve prosthesis is installed in the above-mentioned valve stent.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention provides a positioning flap and a clamping flap on the valve stent and the positioning balloon, thereby achieving expansion of the valve stent when the positioning balloon expands. When the valve stent is not positioned accurately, the positioning balloon contracts to cause the locking flap to drive the clamping flap to contract, thereby contracting the valve stent for easy repositioning. This method can simplify the steps of recovering the valve stent, while also reducing the difficulty of the operation and improving the efficiency of the operation.

[0016] 2. The present invention uses a sealing airbag, which is divided into two parts, a supporting airbag and an external airbag. When heart valve regurgitation occurs, the guide circuit inside the external airbag allows the regurgitated liquid to flow out together with the liquid pumped out by the next heart beat, thereby effectively avoiding the occurrence of regurgitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 It is a schematic diagram of the positioning airbag and valve stent of the present invention; Figure 3 It is a schematic diagram of the position of the clamping flap of the present invention; Figure 4 It is a schematic diagram of the cooperation between the clamping flap and the locking flap of the present invention; Figure 5 It is a schematic diagram of the positions of the support portion and the folding portion of the present invention; Figure 6 It is a schematic diagram of the internal relationship of the sealed airbag of the present invention; Figure 7 It is an enlarged view of point A of the present invention; Figure 8 is a schematic diagram of the interior of the inflation hole of the present invention; Fig. 9 It is a schematic diagram of the position of the diversion hole of the present invention; Fig.10 It is a schematic diagram of the reflux flow of the present invention; Fig.11 It is an enlarged view of point B of the present invention.

[0019] In the figure: 1. positioning airbag; 11. locking flap; 12. locking through hole; 13. inflation nozzle; 2. valve bracket; 21. supporting part; 211. snap-in groove; 22. folding part; 23. clamping flap; 3. sealing airbag; 31. supporting airbag; 311. inflation hole; 312. sealing gasket; 313. extended sealing part; 32. external airbag; 321. first guide hole; 322. second guide hole; 323. third guide hole; 324. sealing cover; 325. pressure plate. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. Such terms are only used to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0023] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The disclosed embodiments are intended to solve the problem of paravalvular leakage or regurgitation caused by inaccurate fixing of existing valve stents or insufficient sealing with the surrounding tissues of the heart, which can greatly damage the patient's health. At the same time, if the existing inaccurate positioning is discovered during the operation, the valve stent usually needs to be removed and repositioned. This approach will increase the difficulty of the operation and reduce the efficiency of the operation. In view of this, the disclosed embodiments propose a valve stent and an artificial heart valve prosthesis, which replaces traditional external heating with internal heating, and sets a positioning flap and a clamping flap on the valve stent and the positioning balloon, so as to achieve expansion of the valve stent when the positioning balloon expands. When the valve stent is not positioned accurately, the positioning balloon contracts to cause the locking flap to drive the clamping flap to contract, thereby contracting the valve stent for easy repositioning. This method can simplify the steps of valve stent recovery, reduce the difficulty of the operation, and improve the efficiency of the operation. At the same time, by dividing the sealing balloon into two parts, a supporting balloon and an external balloon, when backflow of the heart valve occurs, the diversion circuit inside the external balloon causes the backflowing liquid to flow out together with the liquid pumped out by the next heart beat, thereby effectively avoiding the occurrence of backflow.

[0025] like Figures 1 to 11 As shown, a valve stent comprises a positioning balloon 1 and a valve stent 2, wherein the positioning balloon 1 is installed inside the valve stent 2, a clamping flap 23 is installed inside the valve stent 2, the clamping flap 23 is arrayed inside the valve stent 2, and the clamping flap 23 is used to provide support for the locking flap 11; a locking flap 11 is provided on the positioning balloon 1, a locking through hole 12 is provided on the locking flap 11, and the locking through hole 12 is installed on the clamping flap 23, the positioning balloon 1 causes the locking flap 11 to drive the clamping flap 23 to contract by contraction, thereby contracting the valve stent 2, so as to facilitate repositioning; a sealing balloon 3 is also provided outside the valve stent 2, and the sealing balloon 3 is used to completely seal the valve stent 2 to cover the paravalvular leakage and regurgitation areas, thereby preventing the occurrence of paravalvular leakage and regurgitation; During operation, the staff operates the catheter to drive the positioning balloon 1 and the valve stent 2 to the designated position, and then inflates the positioning balloon 1. The expanded positioning balloon 1 drives the valve stent 2 to expand. When the valve stent 2 is fully expanded, the sealing balloon 3 is also fully expanded to fix the valve stent 2 and the heart valve at the designated position. At the same time, the locking flap 11 in the positioning balloon 1 is still on the clamping flap 23 of the valve stent 2. When the valve stent 2 needs to be adjusted, it is only necessary to inhale the positioning balloon 1 to shrink it, and then the positioning balloon 1 shrinks so that the locking flap 11 drives the clamping flap 23 to shrink, and then the valve stent 2 shrinks, so as to facilitate repositioning; after the position of the valve stent 2 is determined, the staff pulls the positioning balloon 1 backward to separate the locking flap 11 from the clamping flap 23, and then shrinks the positioning balloon 1 and withdraws the positioning balloon 1; By using the above-mentioned valve stent 2 and positioning balloon 1 in combination, the contraction of the valve stent 2 can be controlled by the contraction of the balloon, thereby achieving repeated positioning of the position of the valve stent 2. At the same time, a sealing balloon 3 is provided on the valve stent 2 to further increase the sealing effect of the valve stent 2. This method can simplify the steps of recovering the valve stent 2, while also reducing the difficulty of the operation and increasing the efficiency of the operation.

[0026] like Figures 2 to 5 As shown, the valve stent 2 includes a support portion 21 and a folding portion 22, and the support portion 21 is a mesh structure; the support portion 21 with a mesh structure is used to achieve the folding and contraction effect of the valve stent 2; the folding portion 22 is installed between the support portions 21, and the folding portion 22 is used to link with the positioning balloon 1 through a clamping flap 23, that is, the positioning balloon 1 pulls the folding portion 22 by expansion, and then the folding portion 22 pulls the support portion 21 to contract or unfold; the folding portion 22 is a V-shaped structure, and the folding portion 22 with a V-shaped structure is used to achieve its rapid folding or unfolding effect; and a locking flap 11 is installed in the middle position of the folding portion 22, which is used to be fixed with the clamping groove 211 of the support portion 21, so as to achieve stable expansion of the valve stent 2 when the clamping groove 211 is clamped with the folding portion 22, so as to cooperate with the heart valve to achieve stable work inside the heart.

[0027] The valve stent 2 using the above-mentioned supporting portion 21 and folding portion 22 can better position the valve stent 2 compared to the existing direct deployment. At the same time, during the adjustment of the valve stent 2, the positioning balloon 1 can drive the valve stent 2 to ensure that it is not damaged during repeated positioning, while also avoiding damage to human tissue.

[0028] like Figure 3 and Figure 4As shown, the locking flap 11 is L-shaped and the starting direction of the locking flap 11 is opposite to the forward direction of the transport catheter. The purpose of pointing the locking flap 11 in the opposite direction to the forward direction is to enable the positioning balloon 1 to better push the locking flap 11 forward during the process of the positioning balloon 1 driving the valve stent 2 forward. At the same time, after the positioning is completed, the positioning balloon 1 can be directly pulled to make the locking flap 11 quickly detach from the positioning flap and then detach from the valve stent 2 to complete the installation of the valve stent 2.

[0029] like Figure 5 As shown, the support portion 21 is provided with a clamping groove 211 clamped with the folding portion 22, and the clamping groove 211 is used to clamp the folding portion 22, so that the folding portion 22 can play a supporting effect on the entire valve stent 2 after the valve stent 2 is fully unfolded. At the same time, this clamping method can be used without interfering with the adjustment effect of the folding portion 22 during adjustment. In the process of unfolding and positioning the valve stent 2, it cooperates with the positioning airbag 1, that is, the positioning airbag 1 expands to gradually unfold the folding portion 22 until the folding portion 22 is clamped into the clamping groove 211. At this time, the entire valve stent 2 is in a stable state, and the valve stent 2 is ensured not to shrink in the absence of external force pulling at the same time, thereby ensuring the service life of the valve stent 2.

[0030] like Figure 6 As shown, the sealing airbag 3 is a double-layer structure, which includes a supporting airbag 31 and an external airbag 32; an inflation hole 311 is provided in the supporting airbag 31, and the supporting airbag 31 is used to inflate to ensure the sealing effect of the sealing airbag 3; an inflation nozzle 13 is provided in the positioning airbag 1, and the inflation nozzle 13 is used to inflate air into the supporting airbag 31; the inflation nozzle 13 is inserted into the inflation hole 311 in the initial state, and a sealing gasket 312 is provided in the inflation hole 311, and the sealing gasket 312 is used to seal the supporting airbag 31 after the inflation nozzle 13 is inflated and evacuated; During operation, during the inflation of the positioning airbag 1, gas rushes into the supporting airbag 31 through the inflation nozzle 13 and the inflation hole 311. At this time, the supporting airbag 31 expands and props up, and the expanded supporting airbag 31 drives the external airbag 32 to prop up. At this time, the entire sealing airbag 3 seals the gap between the valve stent 2 and the human body. When the positioning airbag 1 is pulled out, the soft inflation nozzle 13 is pulled out from the inflation hole 311. When the inflation hole 311 is pulled out, the sealing gasket 312 blocks the inflation hole 311 under the action of air pressure to complete the airbag sealing work.

[0031] The sealing mechanism using the double-sided airbags is used to effectively avoid the occurrence of reflux when heart valve reflux occurs. Due to the guide circuit inside the external airbag 32, the refluxed liquid flows out together with the liquid pumped out by the next heart beat, thereby effectively avoiding the occurrence of reflux.

[0032] like Figure 6 and Figure 7 As shown, the sealing gaskets 312 are arranged in a circular array in the inflation hole 311, and the sealing gaskets 312 are used to seal the inflation hole 311; and each of the sealing gaskets 312 is provided with an extended sealing portion 313, and the extended sealing portion is used to further consolidate the sealing of the sealing gasket 312, and each extended sealing portion 313 is connected to an adjacent sealing gasket 312; During operation, when the inflation nozzle 13 is inserted, the sealing gasket 312 is in an open state. When the inflation nozzle 13 is pulled out, due to the existence of the extended sealing portion 313 and the air pressure in the airbag, the sealing gaskets 312 are interlocked with each other, thereby avoiding the escape of gas and ensuring the sealing of the sealed airbag 3.

[0033] like Figure 6 and Figure 7 As shown, the cross-section of the support airbag 31 is a star-shaped structure, and the four corners of the support airbag 31 are connected to the external airbag 32. The star-shaped sealing airbag 3 is used to drive the external airbag 32 to expand when it is expanded, thereby better achieving the sealing effect of the sealing airbag 3. At the same time, it is also more convenient to set a diversion channel in the external airbag 32 to further avoid blood reflux. At the same time, under the action of the star-shaped airbag, the sealing airbag 3 can drive the valve stent 2 to be better clamped inside the heart.

[0034] like Fig. 9 As shown, the top of the external airbag 32 is provided with a first guide hole 321, and the supporting airbag 31 is provided with a second guide hole 322, and the bottom of the external airbag 32 is provided with a third guide hole 323. The first guide hole 321 is provided in the external airbag 32 for collecting the refluxed blood, and the second guide hole 322 is used to direct the blood from the upper part of the external airbag 32 to the lower part of the external airbag 32, and flows out through the third guide hole 323. The outflowing blood flows to the whole body through the heart valve along with the next round of blood pumping; For some older patients, due to aging, the functional components of the heart pumping blood become weak, and along with the aging of the original heart valve, a backflow effect will occur. After the interventional stent surgery, a new heart valve is replaced, but occasionally some blood will still stay on both sides of the heart valve. The above-mentioned diversion circuit can make the blood flow through the first diversion hole 321 to the second diversion hole 322 and then to the third diversion hole 323 and be delivered together with the next blood pumping; Furthermore, due to the double-layer structure of the sealing airbag 3 and the star-shaped structure of the internal supporting airbag 31, a complete blood diversion path can be established while ensuring a good supporting effect, further avoiding the occurrence of symptoms such as paravalvular leakage and reflux.

[0035] like Fig.10 and Fig.11 As shown, a sealing cover 324 is arranged outside the third flow guide hole 323, and a pressure sheet 325 is arranged on the sealing cover 324. The sealing cover 324 is used to seal the third flow guide hole 323. Under the action of the sealing cover 324, the third flow guide hole 323 is in a normally closed state, and the sealing cover 324 is made of soft material, that is, it can be turned around one side. At the same time, an elastic line is arranged on the other side of the sealing cover 324, which can ensure that the sealing cover 324 is normally closed under normal conditions. The pressure sheet 325 is arranged on the sealing cover 324 so that the blood can apply pressure to the pressure sheet 325 when blood is pumped, so that the sealing cover 324 is opened, so that the refluxed blood can flow to the whole body again along with the pumped blood, and the sealing cover 324 is closed when there is no blood pumping, so as to avoid the phenomenon of blood reflux.

[0036] An artificial heart valve prosthesis is installed in the above-mentioned valve stent.

[0037] The overall working process is as follows: the staff operates the catheter to drive the positioning balloon 1 and the valve stent 2 to the designated position, and then inflates the positioning balloon 1. The expanded positioning balloon 1 drives the valve stent 2 to expand. When the valve stent 2 is fully expanded, the sealing balloon 3 is also fully expanded to fix the valve stent 2 and the heart valve at the designated position. At the same time, the locking flap 11 in the positioning balloon 1 is still on the clamping flap 23 of the valve stent 2. When the valve stent 2 needs to be adjusted, it is only necessary to inhale the positioning balloon 1 to shrink it, and then the positioning balloon 1 shrinks so that the locking flap 11 drives the clamping flap 23 to shrink, and then the valve stent 2 shrinks, so as to facilitate repositioning; after the position of the valve stent 2 is determined, the staff pulls the positioning balloon 1 backward to separate the locking flap 11 from the clamping flap 23, and then shrinks the positioning balloon 1 and withdraws the positioning balloon 1; During the process of inflating the positioning airbag 1, the sealing airbag 3 is also inflated. When the inflation nozzle 13 is inserted, the sealing gasket 312 is in an open state. When the inflation nozzle 13 is withdrawn, due to the existence of the extended sealing portion 313 and the air pressure in the airbag, the sealing gaskets 312 are interlocked with each other, thereby avoiding the escape of gas and ensuring the sealing of the sealing airbag 3. After the sealing airbag 3 is inflated, the sealing airbag 3 drives the valve stent 2 to be installed inside the heart. When blood reflux occurs, the blood reflux The blood flows through the first guide hole 321 to the second guide hole 322 and then to the third guide hole 323 and is delivered together with the next blood pumping. In a normal state, the sealing cover 324 is in a normally closed state. A pressure plate 325 is provided on the sealing cover 324 to allow the blood to apply pressure to the pressure plate 325 when the blood is pumped, so that the sealing cover 324 is opened, and the refluxed blood is accompanied by the pumped blood to flow to the whole body again, and the sealing cover 324 is closed when there is no blood pumping, so as to avoid the phenomenon of blood reflux.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A valve stent, characterized in that: The invention comprises a positioning balloon (1) and a valve support (2), wherein the positioning balloon (1) is installed inside the valve support (2), a clamping flap (23) is installed inside the valve support (2), and the clamping flap (23) is arranged in an array inside the valve support (2). The positioning balloon (1) is provided with a locking flap (11), and a locking through hole (12) is provided on the locking flap (11), and the locking through hole (12) is installed on the clamping flap (23). The positioning balloon (1) contracts to cause the locking flap (11) to drive the clamping flap (23) to contract, thereby causing the valve support (2) to contract, so as to facilitate repositioning. A sealing balloon (3) is also provided outside the valve support (2), and the sealing balloon (3) is used to completely seal the valve support (2) to cover the paravalvular leakage and regurgitation area, thereby preventing the occurrence of paravalvular leakage and regurgitation.

2. A valve stent according to claim 1, characterized in that: The valve support (2) comprises a support portion (21) and a folding portion (22), wherein the support portion (21) is a mesh structure; the folding portion (22) is installed between the support portions (21), the folding portion (22) is a V-shaped structure, and a locking flap (11) is installed in the middle of the folding portion (22).

3. A valve stent according to claim 2, characterized in that: The locking flap (11) is L-shaped and the starting direction of the locking flap (11) is opposite to the advancing direction of the transport catheter.

4. A valve stent according to claim 3, characterized in that: The support portion (21) is provided with a clamping groove (211) for clamping with the folding portion (22).

5. A valve stent according to claim 4, characterized in that: The sealing airbag (3) is a double-layer structure, comprising a supporting airbag (31) and an external airbag (32); an inflation hole (311) is provided in the supporting airbag (31); an inflation nozzle (13) is provided in the positioning airbag (1); the inflation nozzle (13) is inserted into the inflation hole (311) in an initial state; and a sealing gasket (312) is provided in the inflation hole (311).

6. A valve stent according to claim 5, characterized in that: The sealing gaskets (312) are arranged in a circular array within the inflation hole (311), and each of the sealing gaskets (312) is provided with an extended sealing portion (313), and each extended sealing portion (313) is connected to an adjacent sealing gasket (312).

7. A valve stent according to claim 6, characterized in that: The cross section of the support airbag (31) is a star-shaped structure, and the four corners of the support airbag (31) are connected to the external airbag (32).

8. A valve stent according to claim 7, characterized in that: The top of the external airbag (32) is provided with a first guide hole (321), the support airbag (31) is provided with a second guide hole (322), and the bottom of the external airbag (32) is provided with a third guide hole (323).

9. A valve stent according to claim 8, characterized in that: A sealing cover (324) is arranged outside the third guide hole (323), and a pressure sheet (325) is arranged on the sealing cover (324).

10. An artificial heart valve prosthesis, characterized in that: Installed in a valve stent as described in any one of claims 1 to 9.

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