Valve prosthesis suitable for short pulmonary artery

Abstract

The valve prosthesis comprises a support, the support comprises a waist part and a crown part, one end of the waist part is connected with the crown part, the crown part is in a horn shape, the other end of the waist part is provided with an extension section, and one end, away from the waist part, of the extension section is provided with a flow guide notch, or the support comprises the waist part, the crown part and a notch crown part; the two ends of the waist part are connected with the crown part and the notch crown part respectively, the crown part and the notch crown part are both in a horn shape, and a notch in the notch crown part serves as a flow guide notch. The valve prosthesis can adapt to the condition of a short pulmonary artery trunk, the situation that blood cannot flow or flows reversely due to blockage of the left and right pulmonary artery branches is avoided through the flow guide opening, the blood can smoothly enter the valve prosthesis in the left and right pulmonary artery branches due to the existence of the flow guide opening, and therefore impact on the valve prosthesis is reduced, and the service life of the valve prosthesis is prolonged. And the phenomenon of displacement of the valve prosthesis caused by unbalance of the valve prosthesis is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly to a valve prosthesis suitable for short pulmonary arteries. Background Technique

[0002] Transcatheter Pulmonary Valve Implantation (TPVI) is an interventional procedure designed to treat diseases such as pulmonary valve stenosis or insufficiency. It is a relatively new technique that has been used to treat pulmonary valve stenosis and insufficiency since the early 2000s. The advantage of this procedure is that it can avoid traditional open-chest surgery, resulting in a shorter recovery time for patients and reducing surgical-related complications and risks.

[0003] However, some patients are born with short pulmonary arteries, or after undergoing the tetralogy of Fallot operation, the pulmonary artery becomes deformed or even shorter. When such patients undergo transcatheter pulmonary valve implantation, if the pulmonary artery is too short, there may not be enough space to implant the artificial valve prosthesis; during TPVI, it is hoped to borrow the space within the pulmonary artery bifurcation (part of the artificial valve prosthesis enters the left and right pulmonary artery branches) to place the artificial valve prosthesis further away.

[0004] However, when part of the artificial valve prosthesis enters the left and right pulmonary artery branches, it may cause some problems. One is that it will block the left and right pulmonary artery branches, preventing blood from flowing or causing blood reflux; the other is that the shape of the pulmonary artery bifurcation is irregular and not straight, so the artificial valve prosthesis entering the left and right pulmonary artery branches cannot be fully anchored. Coupled with the narrowing of the left and right pulmonary artery branches at the pulmonary artery bifurcation and the relatively fast blood flow velocity, it will impact the artificial valve prosthesis entering the left and right pulmonary artery branches, which may cause the artificial valve prosthesis to become unbalanced, resulting in the displacement of the artificial valve prosthesis, making the artificial valve prosthesis lose its function or requiring further surgery.

[0005] Therefore, it is necessary to design a valve prosthesis suitable for short pulmonary arteries to avoid blocking the left and right pulmonary artery branches and causing blood to stop flowing or reflux, as well as the imbalance of the valve prosthesis and the displacement of the valve prosthesis when borrowing the space within the pulmonary artery bifurcation during TPVI. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a valve prosthesis suitable for short pulmonary arteries to solve the above problems.

[0007] To achieve the above object of the utility model, the following technical solutions are adopted:

[0008] The present application provides a valve prosthesis suitable for a short pulmonary artery, including a stent. The stent includes a waist and a crown. One end of the waist is connected to the crown. The crown is trumpet-shaped and gradually expands outward from the direction close to the waist to the direction away from the waist. The other end of the waist is provided with an extension section, and a diversion notch is provided at one end of the extension section away from the waist, or,

[0009] The stent includes a waist, a crown, and a notched crown. Both ends of the waist are respectively connected to the crown and the notched crown. Both the crown and the notched crown are trumpet-shaped and gradually expand outward from the direction close to the waist to the direction away from the waist. The notch on the notched crown serves as the diversion notch.

[0010] Further, a single-sided diversion notch or a double-sided diversion notch is provided on the notched crown;

[0011] The waist includes a plurality of unit meshes, and the plurality of unit meshes are distributed along the circumferential direction of the waist. Adjacent unit meshes are connected to each other to form the circumferentially complete waist.

[0012] Further, the crown includes a plurality of unit meshes, and the plurality of unit meshes are distributed along the circumferential direction of the waist. The plurality of unit meshes are connected to one end of the waist, and adjacent unit meshes are connected to each other to form the circumferentially complete crown;

[0013] The plurality of unit meshes gradually expand outward from the direction close to the waist to the direction away from the waist.

[0014] Further, the extension section includes a rod body and an annular connecting member. There are a plurality of rod bodies, and the plurality of rod bodies are respectively connected to the other end of the waist. The annular connecting member connects the ends of the plurality of rod bodies away from the waist together in the circumferential direction.

[0015] Further, the plurality of rod bodies gradually expand outward from the direction close to the waist to the direction away from the waist to form the trumpet-shaped extension section;

[0016] The cross-section of the diversion notch along its axial direction is a concave arc shape with a lower middle and higher ends.

[0017] Further, the notched crown includes a first unit mesh and a second unit mesh. The first unit mesh and the second unit mesh are respectively connected to the corresponding ends of the waist. Both ends of the first unit mesh and both ends of the second unit mesh are disconnected from each other to form the double-sided diversion notch between the first unit mesh and the second unit mesh;

[0018] A positioning member is connected between the first unit grid and the second unit grid.

[0019] Further, the notched crown portion includes two crown bodies, the two crown bodies are respectively connected to the corresponding ends of the waist portion, and the two ends of the two crown bodies are disconnected from each other to form the bilateral diversion notch between the two crown bodies.

[0020] Further, each crown body includes a plurality of unit grids, the plurality of unit grids are connected to the corresponding ends of the waist portion, the plurality of unit grids are distributed along the circumferential direction of the waist portion, and adjacent unit grids are connected to each other to form the crown body, wherein

[0021] The unit grids located at the two ends of one crown body are disconnected from the unit grids located at the two ends of the other crown body, so as to form the bilateral diversion notch.

[0022] Further, the notched crown portion includes one crown body, one crown body is connected to the corresponding end of the waist portion, and the two ends of one crown body are disconnected from each other to form the unilateral diversion notch on one crown body.

[0023] Further, each crown body includes a plurality of unit grids, the plurality of unit grids are connected to the corresponding ends of the waist portion, the plurality of unit grids are distributed along the circumferential direction of the waist portion, and adjacent unit grids are connected to each other to form the crown body, wherein

[0024] The unit grids located at the two ends of the crown body are disconnected from each other to form the unilateral diversion notch.

[0025] Further, the positioning member includes a connecting rod and a top portion, the two connecting rods are respectively connected to the corresponding first unit grid and second unit grid, the top portion is arranged between the two connecting rods, and the two connecting rods are tapered inward in the radial direction of the waist portion so as to be able to be connected to the top portion together.

[0026] Further, a connecting claw is further included, and the connecting claw is arranged at one end of the crown portion far from the waist portion.

[0027] Further, a sealing film adapted to the waist portion, the crown portion, and the extension section is further included, and the sealing film is sutured to the inner side or the outer side of the waist portion, the crown portion, and the extension section; or,

[0028] A sealing film adapted to the waist portion, the crown portion, and the notched crown portion is further included, and the sealing film is sutured to the inner side or the outer side of the waist portion, the crown portion, and the notched crown portion;

[0029] A valve leaf is further included, and the valve leaf is sutured to the inner side of the waist portion.

[0030] With the above technical solution, the utility model has the following beneficial effects:

[0031] The valve prosthesis applicable to the short pulmonary artery of the present application can adapt to the situation of a relatively short main pulmonary artery. When borrowing the space within the pulmonary artery bifurcation during TPVI, the diversion opening can prevent the blockage of the left and right pulmonary artery branches, which may cause blood flow obstruction or backflow. Moreover, due to the existence of the diversion opening,

[0032] blood can smoothly pass through and enter the valve prosthesis within the left and right pulmonary artery branches, thereby reducing the impact on the valve prosthesis and avoiding the occurrence of valve displacement caused by the imbalance of the valve prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 It is a schematic structural diagram of the valve prosthesis applicable to the short pulmonary artery in the first embodiment of the present application;

[0035] Figure 2 It is a schematic structural diagram of another valve prosthesis applicable to the short pulmonary artery in the first embodiment of the present application (removing the extension section);

[0036] Figure 3 It is a schematic structural diagram of the valve prosthesis applicable to the short pulmonary artery in the second embodiment of the present application;

[0037] Figure 4 It is a schematic structural diagram of the valve prosthesis applicable to the short pulmonary artery in the third embodiment of the present application;

[0038] Figure 5 It is a schematic structural diagram of the first perspective of the valve prosthesis applicable to the short pulmonary artery in the fourth embodiment of the present application;

[0039] Figure 6 It is a schematic structural diagram of the second perspective of the valve prosthesis applicable to the short pulmonary artery in the fourth embodiment of the present application.

[0040] Reference numerals: 1 - stent; 2 - waist; 3 - crown; 4 - extension section; 5 - diversion notch; 6 - unit mesh; 41 - rod body; 42 - annular connecting member; 7 - connecting claw; 8 - notched crown; 81 - crown body; 82 - first unit mesh; 83 - second unit mesh; 9 - positioning member; 91 - connecting rod; 92 - top. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0042] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0043] Embodiment 1:

[0044] As Figure 1 shown, the valve prosthesis applicable to the short pulmonary artery in this Embodiment 1 includes a stent 1. The stent 1 includes a waist 2 and a crown 3. One end of the waist 2 is connected to the crown 3. The crown 3 is in a trumpet shape and gradually expands outward from the direction close to the waist 2 to the direction away from the waist 2. The other end of the waist 2 is provided with an extension section 4, and a diversion notch 5 is provided at the end of the extension section 4 away from the waist 2.

[0045] Preferably, the length of the extension section 4 is less than the length of the crown 3.

[0046] The valve prosthesis applicable to the short pulmonary artery in this Embodiment 1 replaces one of the crowns (two crowns) of the existing valve prosthesis with the extension section 4, and the length of the extension section 4 is less than the length of the crown 3. Therefore, the overall length is shortened. With this setting, when the patient's pulmonary artery is short and the space in the pulmonary artery bifurcation needs to be borrowed during TPVI, the valve prosthesis applicable to the short pulmonary artery in this Embodiment 1 has two placement methods, which are described separately below:

[0047] The first placement method is that the extension section 4 is located at the junction of the main pulmonary artery and the left and right pulmonary artery branches, but does not enter the left and right pulmonary artery branches (it can also be understood that the end of the extension section 4 away from the waist 2 is still located in the main pulmonary artery). In this placement method, the diversion notch 5 on the extension section 4 does not work, and the extension section 4 will not affect the blood flow in the left and right pulmonary artery branches, avoiding the blockage of the left and right pulmonary artery branches resulting in the inability of blood to flow or reverse flow. Moreover, in this placement method, there is no situation of the impact of blood flow on the extension section 4. Thus, it can avoid the imbalance of the valve prosthesis leading to the displacement of the valve prosthesis.

[0048] In the second placement method, the extension section 4 is located at the junction of the main pulmonary artery and the left and right pulmonary artery branches, but the end of the extension section 4 far from the waist 2 enters the left and right pulmonary artery branches. In this placement method, the diversion notch 5 on the extension section 4 plays a diversion role. Through the diversion notch 5 on the extension section 4, the influence of the extension section 4 on the blood flow in the left and right pulmonary artery branches is reduced, avoiding blockage of the left and right pulmonary artery branches resulting in blood flow inability or backflow. Moreover, the existence of the diversion notch 5 reduces the impact of blood flow on the extension section 4. Thus, valve prosthesis displacement caused by valve prosthesis imbalance can be avoided.

[0049] Regarding the above first method and second placement method, they are caused by the objective operating conditions and the operator's operating level during the placement of the valve prosthesis suitable for the short pulmonary artery.

[0050] Specifically, the crown 3 includes a plurality of unit meshes 6. The plurality of unit meshes 6 are distributed circumferentially along the waist 2. One end of the plurality of unit meshes 6 is connected to the waist 2, and adjacent unit meshes 6 are connected to each other to form a circumferentially complete crown 3.

[0051] The plurality of unit meshes 6 gradually expand outward from the direction close to the waist 2 to the direction far from the waist 2, so as to form a trumpet-shaped crown 3. The unit mesh 6 is preferably a rhombic grid.

[0052] Specifically, the extension section 4 includes a rod body 41 and an annular connector 42. There are multiple rod bodies 41, and the multiple rod bodies 41 are respectively connected to the other end of the waist 2. The annular connector 42 connects the ends of the multiple rod bodies 41 far from the waist 2 together circumferentially.

[0053] Specifically, the multiple rod bodies 41 gradually expand outward from the direction close to the waist 2 to the direction far from the waist 2 to form a trumpet-shaped extension section 4.

[0054] The cross-section of the diversion notch 5 along its axial direction is a concave arc shape with a lower middle and higher ends for the diversion notch 5.

[0055] The concave arc-shaped diversion notch 5 can further reduce the proportion of the end of the extension section 4 far from the waist 2 entering the left and right pulmonary artery branches. Thus, through the concave arc-shaped diversion notch 5, the influence of the extension section 4 on the blood flow in the left and right pulmonary artery branches can be further reduced, and the impact of blood flow on the extension section 4 can be further reduced.

[0056] The trumpet-shaped extension section 4 can also make the blood flow more smoothly when flowing through the extension section 4 and entering the left and right pulmonary artery branches, and can play a role in preventing blood from accumulating at the waist 2.

[0057] Specifically, it further includes a sealing film adapted to the waist 2, the crown 3, and the extension section 4, and the sealing film is sutured to the inner or outer side of the waist 2, the crown 3, and the extension section 4.

[0058] Specifically, it further includes valve leaflets, and the valve leaflets are sutured to the inner side of the waist 2.

[0059] It should be noted that the suturing of the sealing film and the suturing of the valve leaflets are both prior arts and will not be described in detail here.

[0060] Specifically, it further includes a connecting claw 7. The connecting claw 7 is arranged at one end of the crown 3 away from the waist 2. The connecting claw 7 is connected to the crown 3 and is used for connecting to a valve prosthesis delivery system. The structure of the valve prosthesis delivery system and the connection between the connecting claw 7 and the valve prosthesis delivery system are both prior arts in this field, and the structure of the valve prosthesis delivery system and how the connecting claw 7 is connected to the valve prosthesis delivery system will not be described in detail here.

[0061] Preferably, for several unit meshes 6 of the crown 3, the connecting claws 7 can be arranged in a one-to-one correspondence (a connecting claw 7 is arranged on each unit mesh 6), or can be arranged at intervals (a connecting claw 7 is arranged every several unit meshes 6).

[0062] Specifically, the waist 2 includes several unit meshes 6, and the several unit meshes 6 are distributed along the circumferential direction of the waist 2. The adjacent unit meshes 6 are connected to each other to form a circumferentially complete waist 2.

[0063] The valve prosthesis applicable to the short pulmonary artery in the first embodiment is positioned by relying on the trumpet-shaped crown 3 and the trumpet-shaped extension section 4. Therefore, the shape of the waist 2 is usually an equal-diameter straight cylinder, and according to requirements, the shape of the waist 2 can also be set as non-equal-diameter.

[0064] As Figure 2 shown, for the valve prosthesis applicable to the short pulmonary artery in the first embodiment, if with the progress of technology, it can accurately control the valve prosthesis applicable to the short pulmonary artery to be located at the junction of the main pulmonary artery and the left and right pulmonary artery branches, but does not enter the left and right pulmonary artery branches. In this state, the extension section 4 and the diversion notch 5 do not function, and only the waist 2 and the crown 3 can be retained, and the extension section 4 can be removed.

[0065] Embodiment 2:

[0066] As Figure 3As shown, the valve prosthesis applicable to the short pulmonary artery of the present application includes a stent 1. The stent 1 includes a waist 2, a crown 3, and a notched crown 8. Both ends of the waist 2 are respectively connected to the crown 3 and the notched crown 8. Both the crown 3 and the notched crown 8 are trumpet-shaped, and the crown 3 and the notched crown 8 gradually expand outward from the direction close to the waist 2 to the direction away from the waist 2. The notch on the notched crown 8 serves as the diversion notch 5.

[0067] According to the different situations of the patient's own pulmonary artery branches, the diversion notch 5 on the notched crown 8 also has different settings. Generally speaking, there are two pulmonary artery branches, that is, the left and right pulmonary artery branches. For this general situation, bilateral diversion notches 5 need to be provided on the notched crown 8. The bilateral diversion notches 5 exactly correspond to the left and right pulmonary artery branches, and the normal blood flow in the left and right pulmonary artery branches is ensured through the bilateral diversion notches 5.

[0068] Specifically, the crown 3 includes a plurality of unit meshes 6. The plurality of unit meshes 6 are distributed along the circumference of the waist 2. The plurality of unit meshes 6 are connected to one end of the waist 2, and adjacent unit meshes 6 are connected to each other to form a circumferentially complete crown 3; the plurality of unit meshes 6 gradually expand outward from the direction close to the waist 2 to the direction away from the waist 2, so as to form a trumpet-shaped crown 3. The unit mesh 6 is preferably a diamond grid.

[0069] Specifically, the notched crown 8 includes two crown bodies 81. The two crown bodies 81 are respectively connected to the corresponding ends of the waist 2, and the two ends of the two crown bodies 81 are disconnected from each other to form a bilateral diversion notch 5 between the two crown bodies 81.

[0070] Specifically, the crown body 81 includes a plurality of unit meshes 6. The plurality of unit meshes 6 are connected to the corresponding ends of the waist 2. The plurality of unit meshes 6 are distributed along the circumference of the waist 2, and adjacent unit meshes 6 are connected to each other to form the crown body 81. Among them, the unit meshes 6 at both ends of one crown body 81 are disconnected from the unit meshes 6 at both ends of the other crown body 81, thereby forming a bilateral diversion notch 5.

[0071] Preferably, the two crown bodies 81 are symmetrically arranged along the axis of the waist 2.

[0072] Specifically, it further includes a sealing film adapted to the waist 2, the crown 3, and the notched crown 8. The sealing film is sutured to the inner or outer side of the waist 2, the crown 3, and the notched crown 8.

[0073] Specifically, it further includes valve leaflets, and the valve leaflets are sutured to the inner side of the waist 2.

[0074] It should be noted that the suturing of the sealing film and the suturing of the valve leaflets are both prior arts and will not be described in detail here.

[0075] Specifically, it further includes a connecting claw 7. The connecting claw 7 is arranged at one end of the crown 3 away from the waist 2. The connecting claw 7 is connected to the crown 3. The connecting claw 7 is used for connecting with a valve prosthesis delivery system. The structure of the valve prosthesis delivery system and the connection between the connecting claw 7 and the valve prosthesis delivery system are all prior arts in this field, and the structure of the valve prosthesis delivery system and how the connecting claw 7 is connected to the valve prosthesis delivery system will not be described in detail here.

[0076] Preferably, for several unit meshes 6 of the crown 3, the connecting claws 7 can be arranged in a one-to-one correspondence manner (a connecting claw 7 is arranged on each unit mesh 6), or can be arranged in a spaced manner (a connecting claw 7 is arranged every several unit meshes 6).

[0077] Specifically, the waist 2 includes several unit meshes 6. The several unit meshes 6 are distributed along the circumferential direction of the waist 2. The adjacent unit meshes 6 are connected to each other to form a circumferentially complete waist 2.

[0078] The valve prosthesis applicable to the short pulmonary artery in the second embodiment is positioned by relying on the trumpet-shaped crown 3 and the trumpet-shaped notched crown 8. Such a double-crown structure has a better fixing effect on the valve prosthesis after placement. Since the waist 2 usually does not participate in positioning, the shape of the waist 2 is usually an equal-diameter straight cylinder. According to requirements, the shape of the waist 2 can also be set as a non-equal-diameter special-shaped structure.

[0079] For the valve prosthesis applicable to the short pulmonary artery in the second embodiment, when the patient's pulmonary artery is short and the space in the pulmonary artery bifurcation needs to be borrowed during TPVI, the placement method of the valve prosthesis applicable to the short pulmonary artery in the second embodiment is as follows:

[0080] The notched crown 8 is located at the junction of the main pulmonary artery and the branches. One end of the notched crown 8 away from the waist 2 enters the left and right pulmonary artery branches. The bilateral diversion notches 5 on the notched crown 8 play a diversion role. Through the bilateral diversion notches 5, the influence of the notched crown 8 on the blood flow in the left and right pulmonary artery branches is reduced, avoiding blocking the left and right pulmonary artery branches and causing blood flow interruption or backflow. Moreover, the existence of the bilateral diversion notches 5 reduces the impact of blood flow on the notched crown 8. Thus, it can avoid the valve prosthesis from being unbalanced and causing the valve prosthesis to shift.

[0081] Embodiment Three:

[0082] As Figure 4As shown, the valve prosthesis applicable to the short pulmonary artery of the present application includes a stent 1. The stent 1 includes a waist 2, a crown 3, and a notched crown 8. Both ends of the waist 2 are respectively connected to the crown 3 and the notched crown 8. Both the crown 3 and the notched crown 8 are trumpet-shaped, and the crown 3 and the notched crown 8 gradually expand outward from the direction close to the waist 2 to the direction away from the waist 2. The notch on the notched crown 8 serves as the diversion notch 5.

[0083] According to the different conditions of the patient's own pulmonary artery branches, the diversion notch 5 on the notched crown 8 also has different settings. Some patients are congenitally born with only one pulmonary artery branch. For this situation, a unilateral diversion notch 5 needs to be provided on the notched crown 8. The unilateral diversion notch 5 exactly corresponds to one pulmonary artery branch, and through the unilateral diversion notch 5, the normal blood flow in one pulmonary artery branch is ensured.

[0084] Specifically, the crown 3 includes a plurality of unit meshes 6. The plurality of unit meshes 6 are distributed along the circumferential direction of the waist 2. The plurality of unit meshes 6 are connected to one end of the waist 2, and adjacent unit meshes 6 are connected to each other to form a circumferentially complete crown 3. The plurality of unit meshes 6 gradually expand outward from the direction close to the waist 2 to the direction away from the waist 2, so as to be able to form a trumpet-shaped crown 3. The unit mesh 6 is preferably a diamond grid.

[0085] Specifically, the notched crown 8 includes a crown body 81. One crown body 81 is connected to the corresponding end of the waist 2, and both ends of one crown body 81 are disconnected from each other to form a unilateral diversion notch 5 on one crown body 81.

[0086] Specifically, the crown body 81 includes a plurality of unit meshes 6. The plurality of unit meshes 6 are connected to the corresponding end of the waist 2. The plurality of unit meshes 6 are distributed along the circumferential direction of the waist 2, and adjacent unit meshes 6 are connected to each other to form the crown body 81. Among them, the unit meshes 6 at both ends of the crown body 81 are disconnected from each other to form a unilateral diversion notch 5.

[0087] Specifically, it further includes a sealing film adapted to the waist 2, the crown 3, and the notched crown 8. The sealing film is sutured to the inner or outer side of the waist 2, the crown 3, and the notched crown 8.

[0088] Specifically, it further includes valve leaflets, and the valve leaflets are sutured to the inner side of the waist 2.

[0089] It should be noted that the suturing of the sealing film and the suturing of the valve leaflets are both prior arts and will not be described in detail here.

[0090] Specifically, it further includes a connecting claw 7. The connecting claw 7 is arranged at one end of the crown 3 away from the waist 2. The connecting claw 7 is connected to the crown 3. The connecting claw 7 is used for connecting with a valve prosthesis delivery system. The structure of the valve prosthesis delivery system and the connection between the connecting claw 7 and the valve prosthesis delivery system are all prior arts in this field, and the structure of the valve prosthesis delivery system and how the connecting claw 7 is connected to the valve prosthesis delivery system will not be described in detail here.

[0091] Preferably, for several unit meshes 6 of the crown 3, the connecting claws 7 can be arranged in a one-to-one correspondence (a connecting claw 7 is arranged on each unit mesh 6), or the connecting claws 7 can be arranged at intervals (a connecting claw 7 is arranged at intervals of several unit meshes 6).

[0092] Specifically, the waist 2 includes several unit meshes 6. The several unit meshes 6 are distributed along the circumferential direction of the waist 2, and adjacent unit meshes 6 are connected to each other to form a circumferentially complete waist 2.

[0093] The valve prosthesis applicable to the short pulmonary artery in the third embodiment is positioned by relying on the trumpet-shaped crown 3 and the trumpet-shaped notched crown 8. Such a double-crown structure has a better fixing effect after the valve prosthesis is implanted. Since the waist 2 usually does not participate in positioning, the shape of the waist 2 is usually an equal-diameter straight tube shape. According to requirements, the shape of the waist 2 can also be set as a non-equal-diameter special-shaped structure.

[0094] For the valve prosthesis applicable to the short pulmonary artery in the third embodiment, when the patient's pulmonary artery is short and it is necessary to borrow the space inside the pulmonary artery bifurcation during TPVI, the placement method of the valve prosthesis applicable to the short pulmonary artery in the third embodiment is as follows:

[0095] The notched crown 8 is located at the junction of the main pulmonary artery and the branches. One end of the notched crown 8 away from the waist 2 enters the left and right pulmonary artery branches. The unilateral diversion notch 5 on the notched crown 8 plays a diversion role. Through the unilateral diversion notch 5, the influence of the notched crown 8 on the blood flow in one pulmonary artery branch is reduced, avoiding blockage of one pulmonary artery branch resulting in blood unable to flow or reverse flow. And the existence of the unilateral diversion notch 5 reduces the impact of blood flow on the notched crown 8. Thus, it can avoid valve prosthesis imbalance leading to valve prosthesis displacement.

[0096] Embodiment Four:

[0097] As Figures 5 - 6As shown in the figure, the valve prosthesis applicable to the short pulmonary artery in the fourth embodiment includes a stent 1. The stent 1 includes a waist 2, a crown 3, and a notched crown 8. Both ends of the waist 2 are respectively connected to the crown 3 and the notched crown 8. Both the crown 3 and the notched crown 8 are trumpet-shaped, and the crown 3 and the notched crown 8 gradually expand outward from the direction close to the waist 2 to the direction away from the waist 2. The notch on the notched crown 8 serves as a diversion notch 5.

[0098] According to the different conditions of the patient's own pulmonary artery branches, the diversion notch 5 on the notched crown 8 also has different settings. Generally speaking, there are two pulmonary artery branches, that is, the left and right pulmonary artery branches. For this general situation, bilateral diversion notches 5 need to be provided on the notched crown 8. The bilateral diversion notches 5 exactly correspond to the left and right pulmonary artery branches, and the normal circulation of the blood in the left and right pulmonary artery branches is ensured through the bilateral diversion notches 5.

[0099] Specifically, the crown 3 includes a number of unit meshes 6. The number of unit meshes 6 is distributed along the circumferential direction of the waist 2. The number of unit meshes 6 is connected to one end of the waist 2. Adjacent unit meshes 6 are connected to each other to form a circumferentially complete crown 3. The number of unit meshes 6 gradually expands outward from the direction close to the waist 2 to the direction away from the waist 2, so as to form a trumpet-shaped crown 3. The unit mesh 6 is preferably a diamond grid.

[0100] Specifically, the notched crown 8 includes a first unit mesh 82 and a second unit mesh 83. The first unit mesh 82 and the second unit mesh 83 are respectively connected to the corresponding ends of the waist 2. Both ends of the first unit mesh 82 and both ends of the second unit mesh 83 are disconnected from each other, so as to form a bilateral diversion notch 5 between the first unit mesh 82 and the second unit mesh 83;

[0101] A positioning member 9 is connected between the first unit mesh 82 and the second unit mesh 83. The positioning member 9 plays an auxiliary positioning role for the valve prosthesis, that is, the positioning of the valve prosthesis is realized by the contact between the positioning member 9 and the inner wall of the left and right pulmonary artery branches.

[0102] Specifically, it further includes a sealing film adapted to the waist 2, the crown 3, and the notched crown 8. The sealing film is sutured to the inner or outer side of the waist 2, the crown 3, and the notched crown 8.

[0103] Specifically, it further includes valve leaflets, and the valve leaflets are sutured to the inner side of the waist 2.

[0104] It should be noted that the suturing of the sealing film and the suturing of the valve leaflets are both prior arts and will not be described in detail here.

[0105] Specifically, it further includes a connecting claw 7. The connecting claw 7 is arranged at one end of the crown 3 away from the waist 2. The connecting claw 7 is connected to the crown 3 and is used for connecting with a valve prosthesis delivery system. The structure of the valve prosthesis delivery system and the connection between the connecting claw 7 and the valve prosthesis delivery system are all prior arts in this field, and thus the structure of the valve prosthesis delivery system and how the connecting claw 7 is connected to the valve prosthesis delivery system will not be described in detail herein.

[0106] Preferably, for several unit meshes 6 of the crown 3, the connecting claws 7 can be arranged in a one-to-one correspondence manner (a connecting claw 7 is arranged on each unit mesh 6), or can be arranged in a spaced manner (a connecting claw 7 is arranged every several unit meshes 6).

[0107] Specifically, the waist 2 includes several unit meshes 6. The several unit meshes 6 are distributed along the circumferential direction of the waist 2, and adjacent unit meshes 6 are connected to each other to form a circumferentially complete waist 2.

[0108] Preferably, the first unit mesh 82 and the second unit mesh 83 are diamond-shaped grids.

[0109] Preferably, the first unit mesh 82 and the second unit mesh 83 are symmetrically arranged along the axis of the waist 2.

[0110] Specifically, the waist 2 includes several unit meshes 6. The several unit meshes 6 are distributed along the circumferential direction of the waist 2, and adjacent unit meshes 6 are connected to each other to form a circumferentially complete waist 2.

[0111] The valve prosthesis applicable to the short pulmonary artery in this Embodiment 4 realizes its positioning by relying on the trumpet-shaped crown 3 and the trumpet-shaped notched crown 8. Such a double-crown structure has a better fixing effect after the valve prosthesis is implanted. Since the waist 2 usually does not participate in positioning, the shape of the waist 2 is usually an equal-diameter straight cylinder, and according to requirements, the shape of the waist 2 can also be set as a non-equal-diameter special-shaped structure.

[0112] For the valve prosthesis applicable to the short pulmonary artery in this Embodiment 4, when the patient's pulmonary artery is short and it is necessary to borrow the space within the pulmonary artery bifurcation during TPVI, the placement method of the valve prosthesis applicable to the short pulmonary artery in this Embodiment 4 is as follows:

[0113] The notched crown 8 is located at the junction of the main pulmonary artery and its branches. One end of the notched crown 8 away from the waist 2 enters the left and right pulmonary artery branches. The bilateral diversion notches 5 on the notched crown 8 play a diversion role. Through the bilateral diversion notches 5, the influence of the notched crown 8 on the blood flow in the left and right pulmonary artery branches is reduced, avoiding blockage of the left and right pulmonary artery branches resulting in blood being unable to flow or reverse flow. Moreover, the existence of the bilateral diversion notches 5 reduces the impact of blood flow on the notched crown 8. Thus, it can avoid valve prosthesis imbalance leading to valve prosthesis displacement.

[0114] Specifically, the positioning member 9 includes a connecting rod 91 and a top 92. The two connecting rods 91 are respectively connected to the corresponding first unit grid 82 and second unit grid 83. The top 92 is arranged between the two connecting rods 91. The two connecting rods 91 are tapered inward along the radial direction of the waist 2 so as to be able to be connected to the top 92 together.

[0115] After the top 92 contacts the inner wall of the left and right pulmonary artery branches, the valve prosthesis of the fourth embodiment can accurately control the placement position, reducing the influence of the operator's personal factors on the placement position of the valve prosthesis.

[0116] Preferably, the top 92 can be in any form. Figure 5 、 Figure 6 The figure shows that the top 92 is a ring.

[0117] For the valve prosthesis applicable to the short pulmonary artery of the fourth embodiment, when the patient's pulmonary artery is short and the space within the pulmonary artery bifurcation needs to be borrowed during TPVI, the placement method of the valve prosthesis applicable to the short pulmonary artery of the fourth embodiment is as follows:

[0118] The notched crown 8 is located at the junction of the main pulmonary artery and its branches. One end of the notched crown 8 away from the waist 2 enters the left and right pulmonary artery branches until the top 92 of the positioning member 9 contacts the inner wall of the left and right pulmonary artery branches. At this time, the distance that the notched crown 8 enters the left and right pulmonary artery branches is in place. The bilateral diversion notches 5 on the notched crown 8 play a diversion role. Through the bilateral diversion notches 5, the influence of the notched crown 8 on the blood flow in the left and right pulmonary artery branches is reduced, avoiding blockage of the left and right pulmonary artery branches resulting in blood being unable to flow or reverse flow. Moreover, the existence of the bilateral diversion notches 5 reduces the impact of blood flow on the notched crown 8. Thus, it can avoid valve prosthesis imbalance leading to valve prosthesis displacement.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A valve prosthesis suitable for a short pulmonary artery, characterized in that: The bracket comprises a waist and a crown, one end of the waist is connected to the crown, the crown is trumpet-shaped, the crown gradually expands from the direction close to the waist to the direction away from the waist, the other end of the waist is provided with an extension section, and the end of the extension section away from the waist is provided with a guide notch, or, The bracket includes a waist, a crown, and a notch crown. The two ends of the waist are respectively connected to the crown and the notch crown. The crown and the notch crown are both trumpet-shaped. The crown and the notch crown gradually expand outward from close to the waist to away from the waist. The notch on the notch crown serves as a guide notch.

2. The valve prosthesis suitable for short pulmonary arteries according to claim 1, characterized in that: The notch crown is provided with a single-side flow guide notch or a double-side flow guide notch; The waist includes a plurality of unit grids, which are distributed along the circumference of the waist, and adjacent unit grids are connected to each other to form a circumferentially complete waist.

3. The valve prosthesis suitable for short pulmonary arteries according to claim 1, characterized in that: The crown portion includes a plurality of unit grids, the plurality of unit grids are distributed along the circumference of the waist portion, the plurality of unit grids are connected to one end of the waist portion, and the adjacent unit grids are connected to each other to form a circumferentially complete crown portion; A plurality of the unit grids gradually expand outwards from a direction close to the waist to a direction away from the waist.

4. The valve prosthesis suitable for short pulmonary arteries according to claim 1, characterized in that: The extension section includes a rod body and an annular connector. There are multiple rod bodies, and the multiple rod bodies are respectively connected to the other end of the waist. The annular connector connects the ends of the multiple rod bodies away from the waist together in the circumferential direction.

5. The valve prosthesis suitable for short pulmonary arteries according to claim 4, characterized in that: The plurality of rods gradually expand outwards from the direction close to the waist to the direction away from the waist to form the trumpet-shaped extension section; The cross section of the guide gap along the axial direction is an inwardly concave arc shape with a low middle and high ends.

6. The valve prosthesis suitable for short pulmonary arteries according to claim 2, characterized in that: The notched crown portion includes a first unit grid and a second unit grid, the first unit grid and the second unit grid are respectively connected to corresponding ends of the waist portion, and both ends of the first unit grid and the second unit grid are disconnected from each other to form the double-sided flow guide notch between the first unit grid and the second unit grid; A positioning member is connected between the first unit grid and the second unit grid.

7. The valve prosthesis suitable for short pulmonary arteries according to claim 2, characterized in that: The notched crown portion includes two crown bodies, the two crown bodies are respectively connected to corresponding ends of the waist portion, and the two ends of the two crown bodies are disconnected from each other to form the double-sided flow guide notch between the two crown bodies.

8. The valve prosthesis suitable for short pulmonary arteries according to claim 7, characterized in that: The crown body includes a plurality of unit grids, and the plurality of unit grids are connected to corresponding ends of the waist, and the plurality of unit grids are distributed along the circumference of the waist, and adjacent unit grids are connected to each other to form the crown body, wherein: The unit grids located at two ends of one of the crown bodies are disconnected from the unit grids located at two ends of the other crown body, thereby forming the double-sided guide gaps.

9. The valve prosthesis suitable for short pulmonary arteries according to claim 2, characterized in that: The notched crown portion includes a crown body, wherein the crown body is connected to the corresponding end of the waist portion, and the two ends of the crown body are disconnected from each other to form the single-sided flow guide notch on the crown body.

10. The valve prosthesis suitable for short pulmonary arteries according to claim 9, characterized in that: The crown body includes a plurality of unit grids, and the plurality of unit grids are connected to corresponding ends of the waist, and the plurality of unit grids are distributed along the circumference of the waist, and adjacent unit grids are connected to each other to form the crown body, wherein: The unit grids located at the two ends of the crown body are disconnected from each other to form a single-side guide gap.

11. The valve prosthesis suitable for short pulmonary arteries according to claim 6, characterized in that: The positioning member includes a connecting rod and a top, the two connecting rods are respectively connected to the corresponding first unit grid and the second unit grid, the top is arranged between the two connecting rods, and the two connecting rods are gradually tapered inwardly toward the radial direction of the waist so as to be connected to the top.

12. The valve prosthesis suitable for short pulmonary arteries according to claim 1, characterized in that: It also includes a connecting claw, which is arranged at an end of the crown away from the waist.

13. The valve prosthesis suitable for a short pulmonary artery according to any one of claims 1 to 12, characterized in that: It also includes a sealing film adapted to the waist, the crown, and the extension section, wherein the sealing film is sutured to the inner side or the outer side of the waist, the crown, and the extension section; or, It also includes a sealing film adapted to the waist, the crown, and the notched crown, and the sealing film is sutured to the inner side or the outer side of the waist, the crown, and the notched crown; Also included is a valve leaflet, which is sutured to the inner side of the waist.

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