Heart apex interface plugging device after removal of ventricular assist device

Abstract

The invention belongs to the technical field of medical instruments, and discloses a cardiac apex interface plugging device after removal of a ventricular assist device.The cardiac apex interface plugging device 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 device is simple in structure, easy to assemble and disassemble, firm in connection, stable in position and not prone to displacement. The end face of the end, placed in the cardiac apex connector connecting pipeline, of the plug body is further provided with the anti-skid structure, the anti-skid 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] The present invention relates to the technical field of medical devices, and in particular to an apical interface occluding device after a ventricular assist device is removed. Background Art

[0002] Ventricular Assist Device (VAD) is an important means of treating patients with end-stage heart failure. It can not only effectively relieve the burden on the heart, but also buy patients precious time to wait for a heart transplant. In some cases, it can even become a long-term treatment option. However, after VAD implantation, the device may be removed due to changes in the condition, device failure, or when the patient is preparing for a heart transplant. Even after the VAD is removed, symptoms of heart failure may recur. Considering the possibility that cardiac assistance may be needed again in the future, doctors usually retain a stable and easily accessible heart interface on the heart during the initial implantation, and set a heart occluder at the apical interface connection tube.

[0003] As an interventional medical device, the heart occluder can safely and effectively close the channels or defects inside the heart without surgical sutures, facilitating the re-implantation of VAD. However, the existing heart occluder technology still has some defects:

[0004] 1. The fixation is not firm. As the heart continues to beat and the internal environment is complex and changeable, the traditional occluder design is often difficult to maintain its stable position for a long time and is prone to displacement, which not only affects the efficiency of VAD re-access, but also may cause unnecessary damage to the heart tissue;

[0005] 2. Poor coagulation function. If the interface between the occluder and the heart tissue cannot form good endothelialization, that is, 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. Summary of the invention

[0006] The object of the present invention is to provide an apical interface occluding device after the ventricular assist device is removed, which has a simple structure, is easy to assemble and disassemble, has a firm connection, a stable position, is not easy to move, and has strong practicality.

[0007] The technical solution adopted by the present invention to solve its technical problem is: an apical interface blocking device after removing the ventricular assist device, including a plug body and a locking nut, wherein one end of the plug body is embedded in 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 through the locking nut.

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

[0009] Furthermore, the plug body is a columnar structure with a longitudinal section of a "T" shape, and the plug body includes an embedded portion and a fixed portion arranged at the end of the embedded portion, and the diameter of the fixed portion is larger than the inner diameter of the apical interface connecting pipe; the embedded portion is embedded in the interior of the apical interface connecting pipe, and the fixed portion is fastened to the locking nut.

[0010] Furthermore, a clamping groove is provided on a side of the fixing portion that contacts the apex interface, and the end of the apex interface connecting pipe is embedded in the clamping groove.

[0011] Furthermore, a circle of spring structure is provided at the end of the locking nut that cooperates with the fixing part, and the spring structure is bent toward the middle of the locking nut; a clamping table that cooperates with the spring structure is provided on the outer surface of the fixing part, and the end of the spring structure hooks the clamping table; it also includes a fixing ring, and the fixing ring is fastened on the locking nut.

[0012] Furthermore, an anti-retraction groove is provided on the outer periphery of the locking nut, and an anti-retraction protrusion matching with the anti-retraction groove is provided on the inner wall of the fixing ring.

[0013] Furthermore, the anti-slip structure is a plurality of bead-shaped protrusions arranged on the end surface of the plug body.

[0014] The beneficial effects of the present invention are:

[0015] 1. The device of the present invention can accurately and firmly block the apical interface to prevent blood leakage or backflow, thereby ensuring the normal function of the heart. It can also reduce the trauma of the patient and reserve the interface for re-implantation of VAD, thereby improving the efficiency of the operation, having good flexibility, high safety and strong practicality.

[0016] 2. The present invention provides an anti-skid structure at the end of the plug body, which ensures that the apical tissue can easily cling during its growth process, and also prevents the grown apical tissue from slipping off, thereby preventing the formation of polyps. In addition, the normally grown tissue is not easy to coagulate, thereby preventing the formation of thrombus at the apical interface.

[0017] 3. The device of this embodiment uses a plug body, a locking nut and a fixing ring to cooperate with each other, so that the entire device can be firmly fixed at the apex interface, and is not easily displaced, thereby ensuring safety in use.

[0018] 4. The spring structure on the locking nut of the present invention can provide additional locking force for the plug body, effectively preventing the locking nut from loosening; and the portion of the spring structure bent toward the middle of the locking nut cooperates with the clamping surface on the outer surface of the fixing part, which can prevent the nut from sliding inward and ensure that the locking nut fits tightly with the fixing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work:

[0020] Figure 1 It is a schematic diagram of an explosion structure of the present invention.

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

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the present invention from another viewing angle.

[0023] Figure 4 It is a main structural schematic diagram of the present invention.

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

[0025] Figure 6 yes Figure 5 A local enlarged schematic diagram of point A in the middle.

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the plug body of the present invention.

[0027] Figure 8 It is a three-dimensional structural schematic diagram of the plug body of the present invention from another perspective.

[0028] Fig. 9 It is a three-dimensional structural schematic diagram of the locking nut of the present invention.

[0029] Fig.10 It is a schematic diagram of the main structure of the locking nut of the present invention.

[0030] Fig.11 It is a schematic diagram of the structure of the locking nut of the present invention when viewed from above.

[0031] In the figure: 1. plug body; 2. locking nut; 3. apical interface connecting pipe; 4. anti-slip structure; 5. clamping groove; 6. spring structure; 7. clamping table; 8. fixing ring; 9. anti-retraction groove; 10. anti-retraction protrusion; 11. sealing groove; 12. O-ring;

[0032] 101. Embedded portion; 102. Fixed portion. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0034] Example 1

[0035] like Figures 1 to 11 As shown, a device for sealing the apical interface after the ventricular assist device is removed comprises a plug body 1 and a locking nut 2, wherein one end of the plug body 1 is embedded in the apical interface connecting pipe 3 and is flush with the end of the apical interface connecting pipe 3, and the other end is fastened to the apical interface connecting pipe 3 through the locking nut 2. An anti-slip structure 4 is also provided on the end surface of the end of the plug body 1 inserted into the apical interface connecting pipe 3.

[0036] In actual operation, direct suturing after removing the VAD requires open-chest surgery, which may lead to closure failure due to loose sutures or poor tissue healing, which will bring great trauma and risks to the patient. Therefore, using a cardiac occlusion device after removing the VAD can not only achieve minimally invasive surgery, but also avoid the trauma and other complications caused by open-chest surgery. The cardiac occlusion device of this embodiment can accurately and firmly seal the apical interface to prevent blood leakage or backflow, etc., thereby ensuring the normal function of the heart. Compared with traditional suturing technology, the device of this embodiment can not only reduce patient trauma, but also reserve the interface for re-implantation of the VAD, thereby improving surgical efficiency, good flexibility, high safety, and strong practicality.

[0037] The apical interface connection pipe 3 in this embodiment is a commonly used connection pipe retained when a VAD is implanted. Specifically, it is a connection channel created at the apex of the heart, and a small section of the connection pipe is installed at the connection channel position for fixing and connecting the apical cannula. After the VAD is removed, the cardiac cannula is also removed, and only the apical interface connection pipe 3 is retained. The device in this embodiment is to block the retained apical interface connection pipe 3.

[0038] The plug body 1 in this embodiment is made of titanium or nickel-titanium alloy, and titanium is preferred, which has good biocompatibility and can reduce the occurrence of adverse reactions. The principle of titanium having good biocompatibility is the oxide film formed on the surface of titanium, which is very stable and can resist various corrosion and erosion in the human body, thereby protecting titanium from damage.

[0039] The device of this embodiment uses a plug body 1 and a locking nut 2 to cooperate, which can firmly fix the entire device at the apical interface, making it difficult to move, thereby ensuring safety in use. The surface of the anti-skid structure 4 is relatively rough, which increases the friction between the end of the plug body 1 and the apical tissue, provides more attachment points for the apical cells, and helps to reduce the loosening or shedding of the apical tissue during growth, so that the apical cells can more easily adhere and proliferate at the end of the plug body 1, further accelerating the growth and repair process of the apical tissue. In addition, the anti-skid structure 4 is set at the end of the plug body 1. While ensuring that the apical tissue is easy to climb during growth, it can also make the grown apical tissue difficult to slide off, prevent the formation of polyps, and the normally grown tissue is not easy to coagulate, thereby preventing the formation of thrombi 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-skid structure 4 needs to contact human tissue, the present invention sets the anti-skid structure 4 as a smooth texture (such as a plurality of strip-shaped textures or dot-shaped protrusions). Preferably, in this embodiment, the anti-skid structure 4 is a plurality of bead-shaped protrusions arranged on the end surface of the plug body 1, specifically, sintered titanium beads distributed in an array. In addition to increasing the roughness of the surface of the end of the plug body 1 to facilitate the attachment of 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, which helps the end of the plug body 1 to better combine with the tissue around the apex and improve the blocking effect.

[0041] like Figure 1 , Figure 5 , Figure 7 and Figure 8 As shown, in this embodiment, the plug body 1 is a columnar structure, and its longitudinal section is "T" shaped, and the plug body 1 includes an embedded portion 101 and a fixed portion 102 arranged at the end of the embedded portion 101, and the diameter of the fixed portion 102 is larger than the inner diameter of the apical interface connection pipe 3; the embedded portion 101 is embedded in the apical interface connection pipe 3, and the fixed portion 102 is fastened to the locking nut 2. The above structure can ensure that the fixed portion 102 will not enter the apical interface connection pipe 3, ensuring the normal use of the device. The diameter of the fixed portion 102 is larger than the inner diameter of the apical interface connection pipe 3 and is equal to the outer diameter of the apical interface connection pipe 3. The locking nut 2 mainly cooperates with the fixed portion 102 and the outer wall of the apical interface connection pipe 3, so as to fix the plug body 1 on the apical interface connection pipe 3. In order to further reduce the weight of the device, the center of the plug body 1 is set as a hollow structure in this embodiment.

[0042] like Figure 5 , Figure 6 and Figure 8As shown, in this embodiment, a clamping groove 5 is also provided on the side of the fixing part 102 that contacts the apical interface, and the end of the apical interface connecting pipe 3 is embedded in the clamping groove 5. The clamping groove 5 and the end of the apical interface connecting pipe 3 cooperate to achieve the preliminary clamping and positioning of the plug body 1 and the apical interface connecting pipe 3, thereby ensuring the accuracy and stability of the connection. In addition, in this embodiment, a sealing groove 11 is also provided at the end of the apical interface connecting pipe 3, and an O-ring 12 is provided in the sealing groove 11. The provision of the O-ring 12 can enhance the sealing performance of the device and effectively prevent blood leakage.

[0043] like Figures 1 to 8 As shown, in this embodiment, a circle of spring structure 6 is provided at the end of the locking nut 2 that cooperates with the fixing portion 102, and the spring structure 6 is bent toward the middle of the locking nut 2; a clamping table 7 that cooperates with the spring structure 6 is provided on the outer surface of the fixing portion 102, and the end of the spring structure 6 hooks the clamping table 7; it also includes a fixing ring 8, and the fixing ring 8 is tightly sleeved on the locking nut 2.

[0044] The spring structure 6 provided on the locking nut 2 can provide additional locking force for the plug body 1, effectively preventing the locking nut 2 from loosening; at the same time, the nut of the spring structure 6 is easy to install and disassemble, and can be easily completed without special tools or skills, and the installation efficiency is high. The specific number of springs is more than three. In order to ensure the tightness of the connection, the preferred number of springs in this embodiment is eight. The portion of the spring structure 6 bent toward the middle of the locking nut 2 cooperates with the clamping table 7 on the outer surface of the fixing portion 102, which can prevent the nut from sliding inward and ensure that the locking nut 2 fits tightly with the fixing portion 102.

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

[0046] When the device is used, first sleeve the locking nut 2 on the plug body 1, and then sleeve the fixing ring 8 on the locking nut 2. After assembly, align the embedded portion 101 of the plug body 1 with the pipe mouth of the apical interface connecting pipe 3, and then rotate the entire device inward and push it to tighten. It should be noted that in the actual design, more than one circle of locking protrusions are provided on the outer surface of the end of the apical interface connecting pipe 3 that cooperates with the locking nut 2, and the locking nut 2 is provided with a locking groove corresponding to the locking protrusion, which further ensures that the device can be more firmly fixed at the apical interface. In other implementation schemes, the locking protrusion on the apical interface connecting pipe 3 can also be replaced with an external thread, in which case the locking nut 2 is provided with an internal thread matching the external thread.

[0047] Example 2

[0048] The structure of this embodiment is basically the same as that of Example 1, and the difference is only in the connection method between the locking nut 2 and the plug body 1 in this embodiment. Specifically, in this embodiment, no spring sheet is provided. In order to ensure that the fixing portion 102 can be firmly connected to the locking nut 2, an external thread is provided on the outer wall of the fixing portion 102, and a corresponding internal thread is provided on the locking nut 2. When the device is used, the locking nut 2 is first sleeved on the plug body 1, and then the fixing ring 8 is sleeved on the locking nut 2. After assembly, align the embedded portion 101 of the plug body 1 with the pipe mouth of the apical interface connecting pipe 3, and then rotate the entire device inward and push it to tighten. It should be noted that in the actual design, a locking protrusion is also provided on the outer surface of the end of the apical interface connecting pipe 3 that cooperates with the locking nut 2, and a locking groove corresponding to the locking protrusion is provided inside the locking nut 2, which further ensures that the device can be more firmly fixed at the apical interface. In other embodiments, the locking protrusion on the apical interface connecting pipe 3 can also be replaced by an external thread, and in this case, an internal thread matching the external thread is provided inside the locking nut 2.

[0049] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A closure device for the apical interface after removal of a ventricular assist device, characterized in that: It comprises a plug body (1) and a locking nut (2), wherein one end of the plug body (1) is embedded in the interior of the apical interface connecting pipe (3) and is flush with the end of the interior of the apical interface connecting pipe (3), and the other end is fixedly connected to the apical interface connecting pipe (3) via the locking nut (2).

2. The apical port occlusion device after removal of a ventricular assist device according to claim 1, characterized in that: An anti-slip structure (4) is also provided on the end surface of one end of the plug body (1) inserted into the apical interface connection pipe (3).

3. The apical interface occlusion 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, and its longitudinal section is "T"-shaped. The plug body (1) comprises an embedding portion (101) and a fixing portion (102) arranged at the end of the embedding portion (101), and the diameter of the fixing portion (102) is larger than the inner diameter of the apical interface connection pipe (3); the embedding portion (101) is embedded in the apical interface connection pipe (3), and the fixing portion (102) is tightly connected to the locking nut (2).

4. The apical port occlusion device after removal of a ventricular assist device according to claim 3, characterized in that: A clamping groove (5) is also provided on a side of the fixing portion (102) that contacts the apex interface, and the end of the apex interface connecting pipe (3) is embedded in the clamping groove (5).

5. The apical port occlusion device after removal of a ventricular assist device according to claim 3, characterized in that: The end of the locking nut (2) that cooperates with the fixing portion (102) is provided with a circle of spring structure (6), and the spring structure (6) is bent toward the middle of the locking nut (2); the outer surface of the fixing portion (102) is provided with a clamping table (7) that cooperates with the spring structure (6), and the end of the spring structure (6) hooks the clamping table (7); and also includes a fixing ring (8), and the fixing ring (8) is tightly sleeved on the locking nut (2).

6. The apical port occlusion device after removal of a ventricular assist device according to claim 4, characterized in that: The end of the locking nut (2) that cooperates with the fixing portion (102) is provided with a circle of spring structure (6), and the spring structure (6) is bent toward the middle of the locking nut (2); the outer surface of the fixing portion (102) is provided with a clamping table (7) that cooperates with the spring structure (6), and the end of the spring structure (6) hooks the clamping table (7); and also includes a fixing ring (8), and the fixing ring (8) is tightly sleeved on the locking nut (2).

7. The apical interface occlusion device after removal of a ventricular assist device according to claim 5 or 6, characterized in that: An anti-retraction groove (9) is provided on the outer periphery of the locking nut (2), and an anti-retraction protrusion (10) matching with the anti-retraction groove (9) is provided on the inner wall of the fixing ring (8).

8. The apical port occlusion device after removal of a ventricular assist device according to claim 2, 4, 5 or 6, characterized in that: The anti-slip structure (4) is a plurality of bead-shaped protrusions arranged on the end surface of the plug body (1).

9. The apical port occlusion device after removal of a ventricular assist device according to claim 3, characterized in that: The anti-slip structure (4) is a plurality of bead-shaped protrusions arranged on the end surface of the plug body (1).

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