Abdominal aorta graft infected stent taking-out device

Abstract

The utility model provides an aorta abdominalis graft infection stent extraction device, which comprises a main body, a stent recovery clamp and an operating handle, an accommodating cavity is arranged in the main body, the accommodating cavity is exposed at the front end of the main body, the surface of the main body is smooth, the operating handle is positioned at the rear end of the main body, and the stent recovery clamp is arranged in the accommodating cavity. The operation handle pushes and pulls the support recovery clamp. The main body comprises an outer layer, an inner layer and a barb recovery part, the inner layer is arranged in the outer layer, and the front end of the inner layer is located on the rear side of the front end of the outer layer; the barb recovery part is located between the inner layer and the outer layer, and the barb recovery part is connected with the front end of the inner layer, so that the safety of taking out the stent graft is guaranteed, and damage to the aorta wall is avoided.

Description

Technical Field

[0001] The utility model relates to the field of graft infection removal devices, in particular to a stent removal device for abdominal aortic graft infection. Background Art

[0002] Aortic endograft infection (AEI) is a rare but life-threatening serious complication after endovascular aortic repair (EVAR). Its clinical manifestations can range from mild symptoms such as general weakness and mild fever to severe complications such as fatal aortic rupture or sepsis. The incidence of AEI is relatively low, about 0.6% of EVAR patients, but with the development of endovascular treatment technology, its reported frequency has shown a significant upward trend in recent years. Surgical removal of the infected stent is the main treatment method for AEI, which can effectively prevent aortic rupture or recurrence of infection. However, this surgical procedure is technically challenging, especially when removing a stent with suprarenal metal barbs fixation, there may be a risk of aortic injury. Currently, there is no specific standard instrument for graft infection that has been clinically applied.

[0003] Existing graft infection removal devices mainly include modifications to syringes, rectoscopes, etc., such as patent applications CN114376775A and CN115300197A, to achieve the purpose of inwardly converging the stent body and the suprarenal barb part to prevent damage to the aortic wall. However, such off-label use may pose significant safety risks, such as rough edges may be left when modifying the syringe barrel, resulting in aortic wall damage. And modifying such medical devices may not be applicable to most cases of infected stent removal and it is difficult to meet different surgical operation requirements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a stent removal device for abdominal aortic graft infection aiming at the deficiencies in the prior art, to solve the defects of existing cumbersome device modifications and off-label use, ensure the safety of stent graft removal, and avoid aortic wall damage.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A stent removal device for abdominal aortic graft infection, comprising:

[0007] A main body, an accommodation cavity is formed inside the main body, the accommodation cavity is exposed at the front end of the main body, and the surface of the main body is smooth;

[0008] A stent retrieval forceps;

[0009] A handle, the handle is located at the rear end of the main body, and the handle pushes and pulls the bracket retractor;

[0010] The main body includes:

[0011] An outer layer;

[0012] An inner layer, the inner layer is arranged inside the outer layer, and the front end of the inner layer is located behind the front end of the outer layer;

[0013] A barb retraction part, the barb retraction part is located between the inner layer and the outer layer, and the barb retraction part is connected to the front end of the inner layer.

[0014] As a preferred embodiment, the barb retraction part is curved, the concave surface of the barb retraction part faces the rear side, and the convex surface of the barb retraction part faces the front side.

[0015] As a preferred embodiment, the bracket retractor includes:

[0016] A plurality of struts, the plurality of struts are sequentially connected end to end to form a circle, two adjacent struts are in a V shape, the two ends of the strut respectively correspond to the front end and the rear end of the bracket retractor, and one end of the strut corresponding to the rear end of the bracket retractor is connected to the handle.

[0017] As a preferred embodiment, the bracket retractor is made of an elastic material.

[0018] As a preferred embodiment, it further includes:

[0019] A plurality of extension members, the extension members are connected between the bracket retractor and the handle, and the extension members are made of an elastic material.

[0020] As a preferred embodiment, it further includes:

[0021] A support catheter, the support catheter is located in the accommodation cavity, and the support catheter is connected between the handle and the extension member.

[0022] As a preferred embodiment, the support catheter slides in the accommodation cavity.

[0023] As a preferred embodiment, a plurality of holes are formed in the barb retraction part.

[0024] As a preferred embodiment, the front end of the handle is located inside the accommodation cavity, the rear end of the handle is located outside, and the handle can rotate relative to the main body.

[0025] As a preferred embodiment, it further includes:

[0026] A gripping handle, which is arranged on the outer wall of the main body and is close to the rear end of the main body.

[0027] Compared with the prior art, the technical solution has the following advantages:

[0028] The front end of the inner layer is located at the rear side of the front end of the outer layer, and the front end of the inner layer is connected with the barb recovery part, which can converge the barbs of the infected stent, avoid the barbs damaging the aortic wall when the device is removed from the blood vessel of the aorta, and ensure the safety of removing the stent-graft.

[0029] The surface of the main body is smooth, which can prevent damage to the aortic wall, and at the same time is convenient to operate, meeting the requirements of different surgical operations.

[0030] The following further describes the present invention in conjunction with the drawings and embodiments. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of the abdominal aortic graft infection stent removal device of the present invention;

[0032] Figure 2 It is a schematic diagram of the stent retrieval forceps of the present invention being received in the accommodation cavity;

[0033] Figure 3 It is an unfolded schematic diagram of the stent retrieval forceps of the present invention;

[0034] Figure 4 It is a schematic structural diagram of the main body of the present invention;

[0035] Figure 5 It is a schematic structural diagram of the barb recovery part of the present invention.

[0036] In the figure: 100 abdominal aortic graft infection stent removal device,

[0037] 110 main body, 110a outer layer, 110b inner layer, 110c barb recovery part, 111 accommodation cavity, 120 stent retrieval forceps, 121 support rod, 130 operating handle, 140 extension piece, 150 support catheter, 160 gripping handle, 200 infected stent. Detailed Embodiments

[0038] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes that do not deviate from the spirit and scope of the present invention.

[0039] As Figures 1 to 3 shown, the abdominal aortic graft infection stent removal device 100 includes:

[0040] A main body 110, an accommodation cavity 111 is formed inside the main body 110, the accommodation cavity 111 is exposed at the front end of the main body 110, and the surface of the main body 110 is smooth;

[0041] A stent retrieval forceps 120;

[0042] An operating handle 130, the operating handle 130 is located at the rear end of the main body 110, the operating handle 130 pushes and pulls the stent retrieval forceps 120. When the operating handle 130 pushes the stent retrieval forceps 120 out of the accommodation cavity 111, the stent retrieval forceps 120 is in an unfolded state. When the operating handle 130 pulls back the stent retrieval forceps 120, the stent retrieval forceps 120 is received in the accommodation cavity 111.

[0043] The stent retrieval forceps 120 is pre-set inside the accommodation cavity 111. The stent retrieval forceps 120 is pushed out of the accommodation cavity 111 through the operating handle 130. At this time, the stent retrieval forceps 120 is in an unfolded state to clamp the abdominal aortic graft infection stent (hereinafter referred to as the infected stent 200). Then the operating handle 130 pulls back the stent retrieval forceps 120, so that the stent retrieval forceps 120 passes through the front end of the main body 110 and is converged and received into the accommodation cavity 111, while the infected stent 200 is retrieved. In addition, the surface of the main body 110 is smooth, preventing damage to the aortic wall, and at the same time, it is convenient to operate, meeting the requirements of different surgical operations.

[0044] As Figure 1 shown, the front end of the main body 110 is an opening, and the opening is communicated with the accommodation cavity 111. The opening is for the stent retrieval forceps 120 and the infected stent 200 to pass through. The rear end of the main body 110 is closed.

[0045] The main body 110 can be made of medical-grade stainless steel material to ensure strength and durability. The main body 110 is a slender tubular structure, which is convenient for operation in blood vessels. Among them, the front end of the main body 110 is placed inside the blood vessel, and the rear end of the main body 110 is located outside the body. That is, the operator operates the operating handle 130 at the rear end of the main body 110 outside the patient's body, and can pull the infected stent 200 in the blood vessel into the accommodation cavity 111 of the main body 110.

[0046] In this embodiment, the outer diameter of the main body 110 is 30 mm, the inner diameter of the main body 110 is 28 mm, and the length of the main body 110 is 220 mm.

[0047] As Figure 1As shown, the abdominal aortic graft infection stent removal device 100 further includes:

[0048] A holding handle 160, which is arranged on the outer wall of the main body 110 and is close to the rear end of the main body 110.

[0049] The holding handle 160 is also for external operation and is used for gripping. The holding handle 160 is perpendicular to the main body 110, conforming to ergonomics and facilitating operation. By operating the main body 110 to dive and advance through the holding handle 160, it is convenient to reach deep into the abdominal aorta, which is beneficial for retrieving the infected stent 200.

[0050] As Figure 2 and Figure 3 shown, the stent retrieval forceps 120 includes:

[0051] A plurality of struts 121, which are sequentially connected end to end and enclose a circle. Adjacent two struts 121 are in a V shape. The two ends of the strut 121 respectively correspond to the front end and the rear end of the stent retrieval forceps 120. One end of the strut 121 corresponding to the rear end of the stent retrieval forceps 120 is connected to the operating handle 130.

[0052] Since the stent retrieval forceps 120 adopts the above structure and is made of an elastic material, it can be seen that the stent retrieval forceps 120 is accommodated in the accommodation cavity 111 in a squeezing manner. When the stent retrieval forceps 120 is pushed out of the accommodation cavity 111 by the operating handle 130, it can be unfolded as Figure 3 shown to wrap the infected stent 200. In this way, when the operating handle 130 pulls back the stent retrieval forceps 120 into the accommodation cavity 111, at least part of the infected stent 200 can follow the stent retrieval forceps 120 into the accommodation cavity 111. The elastic material includes rubber, etc.

[0053] As Figure 1 and Figure 2 shown, the abdominal aortic graft infection stent removal device 100 further includes:

[0054] A plurality of extension members 140, the front end of the extension member 140 is connected to the connection part at the rear end of the stent retrieval forceps 120, the rear end of the extension member 140 is connected to the operating handle 130, and the extension member 140 is made of an elastic material.

[0055] The extension member 140 is used to connect the stent retrieval forceps 120 and the operating handle 130, and the extension member 140 is made of an elastic material. In this way, when the stent retrieval forceps 120 are pushed out from the accommodation cavity 111, the extension member 140 can incline outwards as the stent retrieval forceps 120 unfold, avoiding the hard connection of the extension member 140 from restricting the unfolding of the stent retrieval forceps 120.

[0056] As Figure 1 and Figure 2 shown, the abdominal aortic graft infection stent removal device 100 further includes:

[0057] A support catheter 150, the support catheter 150 is located in the accommodation cavity 111, and the support catheter 150 is connected between the operating handle 130 and the extension member 140.

[0058] The support catheter 150 is used to connect the operating handle 130 and the extension member 140. The support catheter 150 slides in the accommodation cavity 111, and the operating handle 130 penetrates through the rear end of the main body 110 and is connected to the support catheter 150 in the accommodation cavity 111. The operating handle 130 is connected to the center of the support catheter 150.

[0059] In this embodiment, the number of the extension members 140 is three, and they are arranged at intervals along the circumferential direction of the support catheter 150.

[0060] Referring to Figure 2 , the front end of the operating handle 130 is located inside the accommodation cavity 111, and the rear end of the operating handle 130 is located outside. By pushing the operating handle 130, the release and outward expansion of the extension member 140 and the stent retrieval forceps 120 are realized.

[0061] Preferably, the operating handle 130 can rotate relative to the main body 110, which is beneficial for the operating handle 130 to drive the retrieval of the infected stent 200 through the stent retrieval forceps 120.

[0062] As can be seen from the above, the stent retrieval forceps 120 have the ability of elastic deformation, and can cooperate with the extension member 140 and the support catheter 150 to realize the overall extension and drive the stent retrieval forceps 120 to unfold, and surround the infected stent 200. Then, by cooperating with the rotation and pulling back of the operating handle 130, the aggregation and retrieval of the infected stent 200 are realized.

[0063] Barbs are provided on the infected stent 200. This design is usually used to increase the adhesion and stability of the stent to the blood vessel wall and prevent stent displacement. Refer to patent applications CN108078658A and CN116687619A. It should be noted that barbs are not provided on all surfaces of the infected stent 200. For example, barbs are provided on the head surface of the infected stent 200. In this embodiment, a barb recovery portion 110c is designed to gather the barbs for recovering the infected stent 200. Specifically, as Figure 4 and Figure 5 shown, the main body 110 includes:

[0064] An outer layer 110a;

[0065] An inner layer 110b is disposed inside the outer layer 110a, and the front end of the inner layer 110b is located behind the front end of the outer layer 110a;

[0066] A barb recovery portion 110c is located between the inner layer 110b and the outer layer 110a. The barb recovery portion 110c is connected to the front end of the inner layer 110b. The barb recovery portion 110c is curved, the concave surface of the barb recovery portion 110c faces backward, and the convex surface of the barb recovery portion 110c faces forward.

[0067] After the stent retrieval forceps 120 wrap around the tail of the infected stent 200 and pull the infected stent 200 into the accommodation cavity 111, the barbs on the surface of the infected stent 200 abut against the convex surface of the barb recovery portion 110c, and the front end of the inner layer 110b is located behind the front end of the outer layer 110a to converge the barbs and prevent the external barbs from damaging the blood vessel when the device is pushed out of the aortic blood vessel.

[0068] Furthermore, a plurality of holes are formed in the barb recovery portion 110c. The barbs can be inserted into the holes.

[0069] Furthermore, the barb recovery portion 110c can be made of synthetic resin, polyurethane, etc. There are a plurality of holes distributed thereon, such as a rigid porous sponge shape, so that the barbs on the surface of the infected stent 200 can be inserted into the holes to achieve the convergence of the barbs on the surface of the infected stent 200.

[0070] The barb recovery portion 110c can be connected to the outer layer 110a, or the outer layer 110a and the inner layer 110b are connected by a connecting member to ensure the structural strength of the main body 110.

[0071] The operation steps and precautions of the abdominal aortic graft infected stent retrieval device 100 are as follows:

[0072] The patient's abdominal aorta is incised, and the device body is inserted into the abdominal aorta. The position of the device is adjusted using the holding handle 160 and advanced along the abdominal aorta to the tail of the infected stent 200.

[0073] Push forward the operating handle 130 to drive the support catheter 150 and the extension member 140 to extend along the axial direction of the main body 110, so that the stent retrieval forceps 120 are released outside the device body, and the infected stent 200 is expanded and wrapped by the elastic deformation ability of the stent retrieval forceps 120.

[0074] The operator rotates the operating handle 130 to gradually achieve the inward convergence of the barbs of the infected stent 200. And by continuously pulling back the operating handle 130, the retrieval of the infected stent 200 is achieved.

[0075] In summary, the aortic graft infected stent removal device of this embodiment fills the gap in existing clinical treatments and meets clinical needs, solves the defects of existing cumbersome device modifications and off-label use, etc., ensures the safety of stent graft removal, and prevents damage to the aortic wall. In addition, the front end of the inner layer is located behind the front end of the outer layer, and the front end of the inner layer is connected with the barb retrieval part, which can converge the barbs of the infected stent, avoiding damage to the blood vessel by the barbs when the device is removed from the blood vessel.

[0076] The above-described embodiments are only used to illustrate the technical ideas and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of the patent adoption of the present invention cannot be limited only by these embodiments. That is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the scope of the patent of the present invention.

Claims

1. An abdominal aortic graft infection stent removal device (100), characterized in that, Comprising: A main body (110), an accommodation cavity (111) is formed inside the main body (110), the accommodation cavity (111) is exposed at the front end of the main body (110), and the surface of the main body (110) is smooth; A stent retrieval forceps (120); An operating handle (130), the operating handle (130) is located at the rear end of the main body (110), and the operating handle (130) pushes and pulls the stent retrieval forceps (120); The main body (110) includes: An outer layer (110a); An inner layer (110b), the inner layer (110b) is arranged inside the outer layer (110a), and the front end of the inner layer (110b) is located at the rear side of the front end of the outer layer (110a); A barbed retrieval part (110c), the barbed retrieval part (110c) is located between the inner layer (110b) and the outer layer (110a), and the barbed retrieval part (110c) is connected to the front end of the inner layer (110b).

2. The abdominal aortic graft infection stent removal device (100) according to claim 1, characterized in that, The barbed retrieval part (110c) is curved, the concave surface of the barbed retrieval part (110c) faces the rear side, and the convex surface of the barbed retrieval part (110c) faces the front side.

3. The abdominal aortic graft infection stent removal device (100) according to claim 1, characterized in that, A plurality of holes are formed in the barbed retrieval part (110c).

4. The abdominal aortic graft infection stent removal device (100) according to claim 1, characterized in that, The stent retrieval forceps (120) includes: A plurality of struts (121), the plurality of struts (121) are sequentially connected end to end and enclose a circle, two adjacent struts (121) are in a V shape, and the two ends of the strut (121) respectively correspond to the front end and the rear end of the stent retrieval forceps (120), and the end of the strut (121) corresponding to the rear end of the stent retrieval forceps (120) is connected to the operating handle (130).

5. The abdominal aortic graft infection stent removal device (100) according to claim 4, characterized in that, The stent retrieval forceps (120) is made of an elastic material.

6. The abdominal aortic graft infection stent removal device (100) according to claim 1, characterized in that, Further comprising: A plurality of extension members (140), the extension members (140) are connected between the stent retrieval forceps (120) and the operating handle (130), and the extension members (140) are made of an elastic material.

7. The abdominal aortic graft infection stent removal device (100) according to claim 6, characterized in that, Further comprising: A support catheter (150), the support catheter (150) is located in the accommodation cavity (111), and the support catheter (150) is connected between the operating handle (130) and the extension members (140).

8. The abdominal aortic graft infection stent removal device (100) according to claim 7, characterized in that, The support catheter (150) slides in the accommodation cavity (111).

9. The abdominal aortic graft infection stent removal device (100) according to claim 1, wherein The front end of the operating handle (130) is located inside the accommodation cavity (111), the rear end of the operating handle (130) is located outside, and the operating handle (130) can rotate relative to the main body (110).

10. The abdominal aorta graft infection stent removal device (100) according to claim 1, wherein, Further comprising: A gripping handle (160), the gripping handle (160) is arranged on the outer wall of the main body (110) and is close to the rear end of the main body (110).

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