Heart apex interface plugging device after removal of ventricular assist device

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a cardiac apex interface plugging device after a ventricular assist device is removed, which comprises a plug body and a locking nut, one end of the plug body is embedded into a cardiac apex interface connecting pipeline and is flush with the tail end of the interior of the cardiac apex interface connecting pipeline, and the other end of the plug body is connected with the locking nut. And the other end of the connecting pipe is fixedly connected with the cardiac apex connector connecting pipe through a locking nut. The connecting device is simple in structure, easy to assemble and disassemble, firm in connection, stable in position and not prone to displacement. The anti-skidding structure is further arranged on the end face of the end, placed in the cardiac apex connector connecting pipeline, of the plug body, the anti-skidding structure at the tail end of the plug body is beneficial to tissue growth, thrombus and polyp formation is reduced, and practicability is high.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a device for sealing the apical interface after the removal of a ventricular assist device. Background Technology

[0002] Ventricular assist devices (VADs) are an important treatment for patients with end-stage heart failure. They not only effectively relieve the burden on the heart but also buy valuable time for patients waiting for heart transplantation, and in some cases, become a long-term treatment option. However, VADs may need to be removed after implantation due to changes in the patient's condition, device malfunction, or preparation for heart transplantation. Even after VAD removal, heart failure symptoms may recur. Considering the possibility of needing cardiac assistance again in the future, doctors usually leave a stable and easily accessible cardiac interface on the heart during the initial implantation and place a cardiac occluder at the apical connection point.

[0003] As an interventional medical device, cardiac occluders can safely and effectively close channels or defects inside the heart without the use of surgical sutures, facilitating the reimplantation of transcatheter arteries (VADs). However, existing cardiac occluder technology still has some limitations:

[0004] 1. Insecure fixation: Due to the continuous beating of the heart and the complex and ever-changing internal environment, traditional occluder designs often cannot maintain their positional stability for a long time and are prone to displacement. This not only affects the efficiency of VAD reconnection but may also cause unnecessary damage to heart tissue.

[0005] 2. Poor coagulation function: If the interface between the occluder and the heart tissue cannot form good endothelialization, that is, if the surface is covered by the patient's own vascular endothelial cells, it may lead to thrombosis and increase the risk of serious complications such as stroke and myocardial infarction. Utility Model Content

[0006] The purpose of this invention is to provide an apical interface occlusion device after the removal of a ventricular assist device. It has a simple structure, is easy to assemble and disassemble, has a firm connection, is stable in position, is not easily displaced, and is highly practical.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a apical interface sealing device after the removal of the ventricular assist device, including a plug and a locking nut, wherein one end of the plug is embedded inside the apical interface connecting pipe and is flush with the end of the apical interface connecting pipe, and the other end is fastened to the apical interface connecting pipe by the locking nut.

[0008] Furthermore, an anti-slip structure is provided on the end face of the plug body inserted into the apical interface connecting pipe.

[0009] Furthermore, the plug body has a columnar structure with a "T"-shaped longitudinal section, and includes an insert and a fixing part at the end of the insert. The diameter of the fixing part is larger than the inner diameter of the apex interface connecting pipe. The insert is embedded inside the apex interface connecting pipe, and the fixing part is fastened to the locking nut.

[0010] Furthermore, a snap-fit ​​groove is provided on the side of the fixing part that contacts the apex interface, and the end of the apex interface connecting pipe is embedded in the snap-fit ​​groove.

[0011] Furthermore, the locking nut has a spring-loaded structure at the end that mates with the fixing part, and the spring-loaded structure bends toward the middle of the locking nut; the outer surface of the fixing part has a snap-fit ​​platform that mates with the spring-loaded structure, and the end of the spring-loaded structure hooks onto the snap-fit ​​platform; it also includes a fixing ring, and the fixing ring is securely fitted onto the locking nut.

[0012] Furthermore, the locking nut has an anti-retraction groove on its outer periphery, and the inner wall of the retaining ring has an anti-retraction protrusion that matches the anti-retraction groove.

[0013] Furthermore, the anti-slip structure consists of several bead-shaped protrusions on the end face of the plug.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. The device of this utility model can accurately and firmly seal the apical interface of the heart to prevent blood leakage or backflow, thereby ensuring the normal function of the heart. It can also reduce patient trauma and preserve the interface for VAD reimplantation, improving surgical efficiency, flexibility, safety and practicality.

[0016] 2. The anti-slip structure at the end of the plug body ensures that the apical tissue can easily adhere during its growth process, while also preventing the grown apical tissue from slipping off, thus preventing polyp formation. Furthermore, the normally growing tissue is less prone to blood clotting, thereby preventing thrombus formation at the apical interface.

[0017] 3. The device in this embodiment uses a plug, a locking nut, and a retaining ring to secure the entire device firmly at the core interface, preventing displacement and ensuring safety during use.

[0018] 4. The spring plate structure on the locking nut of this utility model can provide additional locking force to the plug body, effectively preventing the locking nut from loosening; and the part of the spring plate structure that bends towards the middle of the locking nut cooperates with the snap-fit ​​platform on the outer surface of the fixing part, which can prevent the nut from slipping inward and ensure that the locking nut and the fixing part fit tightly together. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an exploded structural diagram of this utility model.

[0021] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 3 This is a three-dimensional structural schematic diagram from another perspective of this utility model.

[0023] Figure 4 This is a schematic diagram of the main structure of this utility model.

[0024] Figure 5 yes Figure 4 A schematic diagram of a structure viewed in section along plane AA.

[0025] Figure 6 yes Figure 5 A magnified view of a portion of point A in the diagram.

[0026] Figure 7 This is a three-dimensional structural diagram of the plug body of this utility model.

[0027] Figure 8 This is a three-dimensional structural diagram of the plug body of this utility model from another perspective.

[0028] Figure 9 This is a three-dimensional structural diagram of a locking nut according to the present invention.

[0029] Figure 10 This is a schematic diagram of the main structure of the locking nut of this utility model.

[0030] Figure 11 This is a bottom view of the locking nut of this utility model.

[0031] In the diagram: 1. Plug body; 2. Locking nut; 3. Core-point interface connecting pipe; 4. Anti-slip structure; 5. Snap-fit ​​groove; 6. Spring structure; 7. Snap-fit ​​platform; 8. Retaining ring; 9. Anti-retraction groove; 10. Anti-retraction protrusion; 11. Sealing groove; 12. O-ring seal;

[0032] 101. Embedded part; 102. Fixing part. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] Example 1

[0035] like Figures 1 to 11 As shown, an apical interface occlusion device after removal of a ventricular assist device includes a plug 1 and a locking nut 2. One end of the plug 1 is embedded inside the apical interface connecting pipe 3 and is flush with the end of the apical interface connecting pipe 3. The other end is securely connected to the apical interface connecting pipe 3 by the locking nut 2. An anti-slip structure 4 is also provided on the end face of the plug 1 that is inserted into the apical interface connecting pipe 3.

[0036] In practice, directly suturing after VAD removal requires open-chest surgery, which may lead to closure failure due to loose sutures or poor tissue healing, causing significant trauma and risks to the patient. Therefore, using a cardiac closure device after VAD removal not only achieves minimally invasive surgery but also avoids the trauma and other complications associated with open-chest surgery. The cardiac closure device of this embodiment can precisely and firmly seal the apical interface, preventing blood leakage or backflow, thereby ensuring normal cardiac function. Compared with traditional suturing techniques, the device of this embodiment reduces patient trauma while preserving the interface for VAD reimplantation, improving surgical efficiency, flexibility, safety, and practicality.

[0037] In this embodiment, the apical interface connection conduit 3 is a common type of connection conduit retained during VAD implantation. Specifically, a connection channel is created at the apex of the heart, and a short section of connection conduit is installed at this connection channel to fix and connect the apical cannula. After the VAD is removed, the cardiac cannula is also removed, leaving only the apical interface connection conduit 3. The device in this embodiment is used to seal the retained apical interface connection conduit 3.

[0038] In this embodiment, the plug 1 is made of titanium or a nickel-titanium alloy, with titanium being preferred due to its good biocompatibility, which reduces the occurrence of adverse reactions. The good biocompatibility of titanium is due to the oxide film formed on its surface. This oxide film is very stable and can resist various forms of corrosion and erosion within the human body, thus protecting the titanium from damage.

[0039] The device in this embodiment uses a plug 1 and a locking nut 2 to firmly fix the entire device at the apical interface, preventing displacement and ensuring safety during use. The anti-slip structure 4 has a relatively rough surface, increasing the friction between the end of the plug 1 and the apical tissue, providing more attachment points for apical cells, helping to reduce loosening or detachment during apical tissue growth. This allows apical cells to adhere and proliferate more easily at the end of the plug 1, further accelerating the growth and repair process of the apical tissue. In addition, the anti-slip structure 4 at the end of the plug 1 ensures easy adhesion during apical tissue growth while preventing the grown apical tissue from slipping, preventing polyp formation, and preventing clotting of normally growing tissue, thus preventing thrombus formation at the apical interface.

[0040] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, in this embodiment, considering that the anti-slip structure 4 needs to contact human tissue, the present invention sets the anti-slip structure 4 as a smooth texture (such as several strip-shaped textures or dot-shaped protrusions). Preferably, in this embodiment, the anti-slip structure 4 is a number of bead-shaped protrusions provided on the end face of the plug body 1, specifically an array of sintered titanium beads. In addition to increasing the roughness of the end surface of the plug body 1, which facilitates the adhesion during tissue growth, the sintered titanium beads also have a microporous structure, which can increase the surface area of ​​the end of the plug body 1, helping the end of the plug body 1 to better integrate with the tissue around the apex of the heart and improve the sealing effect.

[0041] like Figure 1 , Figure 5 , Figure 7 and Figure 8 As shown, in this embodiment, the plug 1 is a columnar structure with a "T"-shaped longitudinal section. The plug 1 includes an embedding portion 101 and a fixing portion 102 located at the end of the embedding portion 101. The diameter of the fixing portion 102 is larger than the inner diameter of the apex interface connecting pipe 3. The embedding portion 101 is embedded inside the apex interface connecting pipe 3, and the fixing portion 102 is securely connected to the locking nut 2. This structure ensures that the fixing portion 102 will not penetrate the apex interface connecting pipe 3, guaranteeing the normal operation of the device. The diameter of the fixing portion 102 is larger than the inner diameter of the apex interface connecting pipe 3 and equal to the outer diameter of the apex interface connecting pipe 3. The locking nut 2 mainly cooperates with the fixing portion 102 and the outer wall of the apex interface connecting pipe 3, thereby fixing the plug 1 to the apex interface connecting pipe 3. To further reduce the weight of the device, this embodiment sets the center of the plug 1 to a hollow structure.

[0042] like Figure 5 , Figure 6 and Figure 8As shown, in this embodiment, the side of the fixing part 102 that contacts the apical interface is also provided with a snap-fit ​​groove 5, and the end of the apical interface connecting pipe 3 is embedded in the snap-fit ​​groove 5. The snap-fit ​​groove 5 and the end of the apical interface connecting pipe 3 cooperate to achieve initial snap-fit ​​and positioning of the plug 1 and the apical interface connecting pipe 3, ensuring the accuracy and stability of the connection. Furthermore, in this embodiment, the end of the apical interface connecting pipe 3 is also provided with a sealing groove 11, and an O-ring seal 12 is provided inside the sealing groove 11. The O-ring seal 12 enhances the sealing performance of the device and effectively prevents blood leakage.

[0043] like Figures 1 to 8 As shown, in this embodiment, the end of the locking nut 2 that cooperates with the fixing part 102 is provided with a ring of spring sheet structure 6, and the spring sheet structure 6 is bent toward the middle of the locking nut 2; the outer surface of the fixing part 102 is provided with a snap-fit ​​platform 7 that cooperates with the spring sheet structure 6, and the end of the spring sheet structure 6 hooks onto the snap-fit ​​platform 7; it also includes a fixing ring 8, and the fixing ring 8 is tightly sleeved on the locking nut 2.

[0044] The spring-loaded structure 6, which provides the locking nut 2, can provide additional locking force to the plug body 1, effectively preventing the locking nut 2 from loosening. Simultaneously, the nut of the spring-loaded structure 6 is easy to install and remove, requiring no special tools or skills, resulting in high installation efficiency. The specific number of spring-loaded pieces is three or more; to ensure a tight connection, this embodiment preferably uses eight spring-loaded pieces. The portion of the spring-loaded structure 6 that bends towards the center of the locking nut 2 engages with the snap-fit ​​surface 7 on the outer surface of the fixing part 102, preventing the nut from slipping inward and ensuring a tight fit between the locking nut 2 and the fixing part 102.

[0045] like Figure 1 , Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, in this embodiment, the locking nut 2 has an anti-retraction groove 9 on its outer periphery, and the inner wall of the fixing ring 8 has an anti-retraction protrusion 10 that cooperates with the anti-retraction groove 9. Specifically, in this embodiment, the anti-retraction groove 9 is provided on the spring sheet structure 6. By cooperating with the anti-retraction groove 9 and the anti-retraction protrusion 10, the fixing ring 8 can be firmly fixed on the locking nut 2, so that the elastic structure of the locking nut 2 cannot expand radially outward, further playing the role of tightening the locking nut 2 and ensuring the firmness of the device connection.

[0046] In use, first, the locking nut 2 is fitted onto the plug body 1, and then the retaining ring 8 is fitted onto the locking nut 2. After assembly, align the insert 101 of the plug body 1 with the opening of the core-point interface connecting pipe 3, and then rotate the entire device inward to tighten it. It should be noted that in the actual design, one or more locking protrusions are provided on the outer surface of the end of the core-point interface connecting pipe 3 that mates with the locking nut 2. The locking nut 2 has a locking groove inside that corresponds to the locking protrusion, further ensuring that the device is more securely fixed at the core-point interface. In other embodiments, the locking protrusions on the core-point interface connecting pipe 3 can be replaced with external threads, in which case the locking nut 2 has an internal thread that matches the external thread.

[0047] Example 2

[0048] This embodiment is basically the same in structure as Embodiment 1, the only difference being the connection method between the locking nut 2 and the plug 1. Specifically, no spring is provided in this embodiment. To ensure that the fixing part 102 can be firmly connected to the locking nut 2, external threads are provided on the outer wall of the fixing part 102, and corresponding internal threads are provided on the locking nut 2. When using this device, first put the locking nut 2 on the plug 1, and then put the fixing ring 8 on the locking nut 2. After assembly, align the insert part 101 of the plug 1 with the opening of the core tip interface connecting pipe 3, and then rotate the entire device inward and tighten it. It should be noted that in the actual design, a locking protrusion is also provided on the outer surface of the end of the core tip interface connecting pipe 3 that mates with the locking nut 2, and a locking groove corresponding to the locking protrusion is provided inside the locking nut 2, further ensuring that the device can be more firmly fixed at the core tip interface. In other implementations, the locking protrusion on the apex interface connecting pipe 3 can be replaced with an external thread, in which case the locking nut 2 has an internal thread that matches the external thread.

[0049] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific implementation method of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the scope of the spirit of this utility model should be included within the protection scope of this utility model.

Claims

1. An apico-aortic interface closure device after removal of a ventricular assist device, characterized in that, The application relates to a plug body (1) and a locking nut (2), wherein one end of the plug body (1) is embedded in the inside of a heart apex interface connecting pipe (3) and is flush with the end of the inside of the heart apex interface connecting pipe (3), and the other end is fastened to the heart apex interface connecting pipe (3) through the locking nut (2).

2. The apical interface closure device after removal of a ventricular assist device of claim 1, wherein, The end face of the one end of the plug body (1) embedded in the inside of the heart apex interface connecting pipe (3) is further provided with an anti-skid structure (4).

3. The apico-aortic interface closure device after removal of a ventricular assist device according to claim 1 or 2, characterized in that The plug body (1) is a columnar structure, the longitudinal section of the plug body (1) is a "T" shape, the plug body (1) comprises an embedding part (101) and a fixing part (102) arranged at the end of the embedding part (101), the diameter of the fixing part (102) is larger than the inner diameter of the heart apex interface connecting pipe (3), the embedding part (101) is embedded in the inside of the heart apex interface connecting pipe (3), and the fixing part (102) is fastened to the locking nut (2).

4. The apico-aortic interface closure device after removal of a ventricular assist device according to claim 3, characterized in that One side of the fixing part (102) in contact with the heart apex interface is further provided with a clamping groove (5), and the end of the heart apex interface connecting pipe (3) is embedded in the clamping groove (5).

5. The apico-aortic interface closure device after removal of a ventricular assist device according to claim 3, characterized in that, The end of the locking nut (2) matched with the fixing part (102) is provided with a ring of elastic sheet structures (6), the elastic sheet structures (6) are bent towards the middle part of the locking nut (2), the outer surface of the fixing part (102) is provided with clamping mesa (7) matched with the elastic sheet structures (6), the end of the elastic sheet structures (6) hooks the clamping mesa (7), and the locking nut (2) is further provided with a fixing ring (8) fastened on the locking nut (2).

6. The apico-aortic interface closure device after removal of a ventricular assist device of claim 4, wherein, The end of the locking nut (2) matched with the fixing part (102) is provided with a ring of elastic sheet structures (6), the elastic sheet structures (6) are bent towards the middle part of the locking nut (2), the outer surface of the fixing part (102) is provided with clamping mesa (7) matched with the elastic sheet structures (6), the end of the elastic sheet structures (6) hooks the clamping mesa (7), and the locking nut (2) is further provided with a fixing ring (8) fastened on the locking nut (2).

7. The apico-aortic interface closure device after removal of a ventricular assist device according to claim 5 or 6, characterized in that The outer periphery of the locking nut (2) is provided with an anti-back-off groove (9), and the inner wall of the fixing ring (8) is provided with an anti-back-off convex (10) matched with the anti-back-off groove (9).

8. The apico-aortic interface closure device after removal of a ventricular assist device according to claim 2, 4, 5 or 6, characterized in that, The anti-skid structure (4) is a plurality of bead-shaped protrusions arranged on the end face of the plug body (1).

9. The apico-aortic interface closure device after removal of a ventricular assist device of claim 3, wherein, The anti-skid structure (4) is a plurality of bead-shaped protrusions arranged on the end face of the plug body (1).

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