A stent-assisted positioning device for abdominal aortic aneurysm sac

Abstract

This invention relates to the field of medical device technology, specifically to an abdominal aortic aneurysm stent-assisted positioning device, comprising: an outer sheath; an inner tube and a positioning component coaxially sleeved inside the outer sheath; the proximal ends of the outer sheath and the inner tube being connected to maintain relative alignment between them; the positioning component being sleeved around the outer periphery of the inner tube and capable of sliding between the outer sheath and the inner tube; a through-hole being provided in the center of the inner tube, through which a guidewire can pass and slide within the inner tube. The abdominal aortic aneurysm stent-assisted positioning device provided by this invention has a simple structure and is easy to operate. It can effectively assist in locating the opening of the short iliac branch of the main stent in the abdominal aortic aneurysm cavity, improve the docking efficiency between the short iliac branch of the main stent and the extended iliac branch stent, reduce surgical time and risk, and decrease radiation damage.

Description

Technical Field

[0001] This invention relates to the field of medical devices, specifically to an abdominal aortic aneurysm stent-assisted positioning device. Background Technology

[0002] Endovascular repair of abdominal aortic aneurysms is the preferred endovascular treatment technique for abdominal aortic aneurysms. The current procedure for releasing an abdominal aortic stent is as follows: A guidewire is inserted into the aortic aneurysm cavity through one iliac artery. First, the proximal main body and short iliac branch portion of the stent are released. At this point, the distal opening of the short iliac branch is temporarily free within the aneurysm cavity. Then, with the aid of a guidewire and catheter, the stent is inserted into the aortic aneurysm cavity through the other iliac artery. The stent opening of the free short iliac branch is located and entered, establishing a working pathway. The extended iliac branch stent is then released through this pathway. Because the short iliac branch is in a three-dimensional suspended state within the large abdominal aortic aneurysm, the surgeon can only observe the stent's planar position using two-dimensional X-ray fluoroscopy. Therefore, manipulating the guidewire and catheter to align with the short iliac branch stent opening is extremely difficult. During the procedure, medical staff cannot accurately determine the spatial relationship between the guidewire, catheter, and stent, often requiring lengthy, blind, and repeated attempts before the guidewire can be successfully inserted into the stent opening. This process takes a lot of time, increasing the risks of surgery, and medical staff and patients also have to endure longer periods of radiation exposure. Summary of the Invention

[0003] The purpose of this invention is to provide an abdominal aortic aneurysm stent-assisted positioning device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An abdominal aortic aneurysm stent-assisted positioning device includes: an outer sheath; an inner tube and a positioning assembly are coaxially sleeved inside the outer sheath;

[0006] The outer sheath is connected to the proximal end of the inner tube, so that the outer sheath and the inner tube can maintain a consistent relative position.

[0007] The positioning component is sleeved on the outer periphery of the inner tube and can slide between the outer sheath and the inner tube;

[0008] The inner tube has a through hole at its center, through which the guide wire can slide.

[0009] Preferably, the proximal end of the outer sheath is provided with a snap-fit ​​ring, and the proximal end of the inner tube is provided with a snap-fit ​​groove corresponding to the snap-fit ​​ring.

[0010] Preferably, the proximal end of the positioning component is provided with a push block, and the proximal end of the outer sheath is provided with a push groove, and the push block can slide in the push groove.

[0011] Preferably, the positioning component has a plurality of shaped bent rods on its far circumference, and an elastic membrane is provided between adjacent shaped bent rods.

[0012] Preferably, a limiting hole is provided at the distal end of the outer sheath;

[0013] By operating the push block to slide in the push groove, the shaping bent rod and the elastic membrane can slide telescopically inside and outside the outer sheath relative to the limiting hole, thereby changing the diameter and depth of the area enclosed by the shaping bent rod and the elastic membrane.

[0014] Preferably, the distal end of the shaped bending rod has an arc-shaped structure and protrudes slightly beyond the apex of the limiting hole when in the retracted state.

[0015] Preferably, a developing ring is provided at the distal end of the inner tube.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The present invention provides an abdominal aortic aneurysm sac stent-assisted positioning device, which has a simple structure and is easy to operate. It can effectively assist in the positioning of short iliac branch stents in the abdominal aortic aneurysm sac, improve the success rate and efficiency of stent docking, reduce operation time and risk, and reduce radiation damage.

[0018] 2. The abdominal aortic aneurysm stent-assisted positioning device provided by this invention is a disposable medical consumable with low cost, suitable for mass production, and has good prospects for industrial transformation. Attached Figure Description

[0019] Figure 1 This is an initial appearance diagram of a stent-assisted positioning device for abdominal aortic aneurysm sac.

[0020] Figure 2 Exploded view of the components of an abdominal aortic aneurysm stent-assisted positioning device;

[0021] Figure 3 Visual representation of the positioning component fully extended;

[0022] Figure 4 A visual representation of the auxiliary positioning status of the positioning component;

[0023] Figure 5 This is a detailed view of the proximal structure at point A;

[0024] Figure 6 Detailed view of the fully retracted positioning component at point B;

[0025] Figure 7 Detailed diagram of the fully extended positioning component at point C;

[0026] Figure 8 Detailed diagram of the auxiliary positioning status of the positioning component at point D.

[0027] In the diagram: 1. Outer sheath; 11. Push groove; 12. Snap ring; 13. Limiting hole; 2. Inner tube; 21. Snap groove; 22. Imaging ring; 3. Positioning assembly; 31. Push block; 32. Shaping bend; 33. Elastic membrane; 4. Guide wire. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0030] In this invention, the handheld end or operating end of the operator is defined as the proximal end, and the handheld end or operating end farther away from the operator is defined as the distal end.

[0031] Please see Figures 1-8 The present invention provides an abdominal aortic aneurysm cavitary stent-assisted positioning device, comprising an outer sheath 1, an inner tube 2 and a positioning component 3 coaxially sleeved inside the outer sheath 1; the positioning component 3 is sleeved on the outer periphery of the inner tube 2 and can slide radially between the outer wall of the inner tube 2 and the inner wall of the outer sheath 1; a through hole is provided in the center of the inner tube 2, and a guide wire 4 can pass through the through hole in the center of the inner tube 2 and slide out from the proximal end of the device to the distal end of the device.

[0032] Specifically, such as Figure 1 , Figure 5 As shown, a snap ring 12 is provided at the proximal end of the outer sheath tube 1, and a snap groove 21 corresponding to the snap ring 12 is provided at the proximal end of the inner tube 2; the outer sheath tube 1 and the inner tube 2 are snapped and fixed by the snap ring 12 and the snap groove 21, so that the outer sheath tube 1 and the inner tube 2 can always maintain the same relative position, forming a cavity between the outer sheath tube 1 and the inner tube 2 for the positioning component 3 to slide, and the sliding cavity is relatively independent from the through hole for the guide wire 4 to slide.

[0033] A push block 31 is fixedly provided at the proximal end of the positioning component 3, and a push groove 11 is also provided at the proximal end of the outer sheath tube 1. The push block 31 can extend out of the push groove 11 and slide along the length of the push groove 11. By moving the push block 31, the operator can make the positioning component 3 slide back and forth relative to the outer sheath tube 1 and the inner tube 2 in the cavity formed by the outer sheath tube 1 and the inner tube 2, thereby completing the operation of expanding the telescopic component at the distal end of the positioning component 3 outside the outer sheath tube 1 or retracting it into the outer sheath tube 1.

[0034] Furthermore, such as Figure 1 , Figures 3-8 As shown, the distal circumference of the positioning component 3 is provided with several shaped curved rods 32. These shaped curved rods 32 are made of a tough material with shaping properties, capable of undergoing a certain degree of deformation and compression according to the restraint device, and restoring and maintaining their set shape characteristics after being released from the restraint device. An elastic membrane 33 is provided between adjacent shaped curved rods 32, and the elastic membrane 33 has different elastic moduli depending on the deformation curvature of the shaped curved rods 32. The function of the elastic membrane 33 is to form a three-dimensional enclosed area within the abdominal aortic aneurysm cavity by the shaped curved rods 32, limiting the range of motion of the short iliac branch stent. The elastic membrane 33 can be a membrane structure with permeability or a mesh structure with permeability.

[0035] A limiting hole 13 is provided at the distal end of the outer sheath 1. The limiting hole 13 is used to limit and restrain the circumferentially distributed shaped bending rod 32, preventing the shaped bending rod 32 from bending and deforming in the circumferential direction. A contrast ring 22 is fixedly provided at the distal end of the inner tube 2. The contrast ring 22 is used to help the operator identify the specific position of the distal end of the inner tube 2 in the abdominal aortic aneurysm cavity under X-ray environment. This position is also the center of the circle enclosed by the positioning component 3, and the position where the guidewire 4 extends.

[0036] The distal end of the shaped curved rod 32 has an arc-shaped structure and protrudes slightly beyond the apex of the limiting hole 13 in the contracted state, facilitating the extension of the shaped curved rod 32. The maximum circumferential diameter of the shaped curved rod 32 matches the maximum diameter of the abdominal aortic aneurysm cavity, and the maximum effective height of the shaped curved rod 32 is greater than the length of the short iliac branch stent. When the shaped curved rod 32 retracts a certain length, its circumferential diameter and effective height match the outer diameter and length of the short iliac branch stent opening. The position of the imaging ring 22 protrudes slightly beyond the distal plane of the limiting hole 13, forming a radial limiting and axial guiding structure for the extension and retraction path of the shaped curved rod 32 together with the limiting hole 13, providing circumferential guidance and restriction of the shaped curved rod 32 during extension and retraction.

[0037] The outer sheath 1 and the inner tube 2 are made of flexible material. They can bend radially when subjected to resistance, but have no elasticity in the circumferential direction and have good circumferential binding ability.

[0038] The process of using this invention is as follows: Figure 6 As shown, in the initial state, all the shaped curved rods 32 and elastic membranes 33 are confined inside the outer sheath 1; at this time, the overall diameter of the device is at its smallest, allowing it to enter the abdominal aortic aneurysm cavity from the thinner iliac branch vessels, and the specific location reached by the distal end of the device can be observed through the imaging ring 22; as shown Figure 7 As shown, when the device reaches the appropriate position in the abdominal aortic aneurysm cavity, the pusher block 31 of the positioning component 3 is pushed so that it reaches the farthest end of the push groove 11 of the outer sheath 1. At this time, all the shaped bending rods 32 are completely deformed and released from the confinement of the outer sheath 1. The cross-sectional area enclosed by the shaped bending rods 32 and the elastic membrane 33 is in the maximum diameter and maximum length state. This diameter state covers the maximum diameter of the abdominal aortic aneurysm cavity, that is, covers the free range of the short iliac branch stent; as Figure 8 As shown, when the push block 31 is pulled back, all the shaped bending rods 32 are simultaneously retracted. Part of the rod body retracts into the limiting hole 13 and is in a constrained state, while the other part of the rod body remains outside the limiting hole 13 and is in a released state. The diameter of the positioning area enclosed by the shaped bending rods 32 gradually decreases from the maximum diameter as the push block 31 is retracted until it is reduced to a size that matches the opening of the free stent, thus confining the short iliac branch stent within the cross-sectional area enclosed by the shaped bending rods 32 and the elastic membrane 33. Then, the guide wire 4 is pushed forward so that it passes through the center of the inner tube 2 and enters the interior of the short iliac branch stent.

[0039] This invention provides an abdominal aortic aneurysm stent-assisted positioning device, employing a three-layer coaxially nested lumen structure. This effectively assists in locating the circumferential and axial regions of a free-floating short iliac branch stent within the abdominal aortic aneurysm lumen, improving stent docking efficiency, reducing surgical time and risk, and minimizing radiation damage. This invention features a simple structure, easy operation, controllable cost, strong practicality, and extremely high potential for industrial-scale production.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stent-assisted positioning device for abdominal aortic aneurysm sac, characterized in that, include: Outer sheath (1); an inner tube (2) and a positioning assembly (3) are coaxially sleeved inside the outer sheath (1); The outer sheath (1) is connected to the proximal end of the inner tube (2) so that the outer sheath (1) and the inner tube (2) can maintain a consistent relative position. The positioning component (3) is sleeved on the outer periphery of the inner tube (2) and can slide between the outer sheath (1) and the inner tube (2); The inner tube (2) has a through hole at its center, and the guide wire (4) can pass through the through hole and slide in the inner tube (2); The positioning component (3) has a plurality of shaped bent rods (32) arranged on its far circumference, and an elastic membrane (33) is arranged between adjacent shaped bent rods (32); the elastic membrane (33) has a permeable function. The distal end of the inner tube (2) is provided with a developing ring (22); The outer sheath (1) is provided with a snap ring (12) at its proximal end, and the inner tube (2) is provided with a snap groove (21) corresponding to the snap ring (12) at its proximal end. The positioning component (3) is provided with a push block (31) at its proximal end, and the outer sheath tube (1) is provided with a push groove (11) at its proximal end. The push block (31) can slide in the push groove (11).

2. The abdominal aortic aneurysm stent-assisted positioning device according to claim 1, characterized in that, The distal end of the outer sheath (1) is provided with a limiting hole (13); By operating the push block (31) to slide in the push groove (11), the shaping bent rod (32) and the elastic membrane (33) can slide inside and outside the outer sheath tube (1) relative to the limiting hole (13), thereby changing the diameter and depth of the area enclosed by the shaping bent rod (32) and the elastic membrane (33).

3. The abdominal aortic aneurysm stent-assisted positioning device according to claim 2, characterized in that, The distal end of the shaped bending rod (32) is an arc-shaped structure and protrudes from the apex of the limiting hole (13) when it is in the contracted state.

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