Limited aorta covered stent
By designing a limited aortic endovascular stent graft, and employing a hollowed-out mesh cylinder structure and endovascular marking, the problem of needing to reserve branch vessel openings and customization in existing technologies has been solved, achieving simplified operation and wide applicability, and effectively sealing vascular ruptures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINESE ACADEMY OF MEDICAL SCIENCES FUWAI HOSPITAL SHENZHEN HOSPITAL (SHENZHEN SUN YAT-SEN CARDIOVASCULAR HOSPITAL)
- Filing Date
- 2025-02-07
- Publication Date
- 2026-05-19
AI Technical Summary
Existing aortic stents require the reservation of branch vessel opening diameters or the customization of branch stents during implantation, which makes the operation complex and limits the scope of application, making it difficult to effectively solve the blood supply problem of the supra-aortic branch arteries and abdominal visceral arteries.
A limited aortic endovascular stent graft is designed, employing a hollow mesh cylindrical structure, which is fixed by weaving and welding metal wires. Combined with the endovascular graft and identification markings, the stent can self-expand or be expanded using a balloon. The endovascular markings are used to adjust the angle to accurately cover the vascular rupture, avoiding the need for additional fenestrations and customization.
It simplifies the operation without obstructing the flow of branch vessels, is applicable to various physiological structures, improves the flexibility and convenience of the stent, and effectively seals vascular ruptures.
Smart Images
Figure CN224251570U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, specifically to a limited aortic endovascular stent graft. Background Technology
[0002] In recent years, endovascular aortic stent grafts have been widely used for aneurysms and dissections in the descending and abdominal aortas, achieving good medium- and long-term results. However, because stent implantation requires ensuring that the blood supply to the major branches of the aorta is not blocked, aortic dissections and aortic aneurysms involving the supra-aortic branches (brachiocephalic trunk, left common carotid artery, left subclavian artery) and visceral arteries (caecilia, superior mesenteric artery, bilateral renal arteries) present a challenge for minimally invasive endovascular treatment. Although techniques such as in situ / pre-fenestration, parallel stents, and branch stents are available, they have drawbacks including complex procedures, the need for customization, and uncertain long-term efficacy.
[0003] In situ fenestration involves implanting a traditional covered stent graft into the aorta without prior fenestration, then locating the opening of the target artery, and fenestrating the branch vessel by puncture with a needle or laser perforation and balloon dilation of the covered stent. The biggest drawback of this method is that the covered stent first covers the branch vessel, and then fenestration takes time, which can easily lead to severe ischemia in the branch vessel.
[0004] Pre-fenestration and branch stenting techniques involve pre-reserving branch vessel opening diameters or branch stents on the covered stent. However, due to the different physiological characteristics of individuals, branch stents also have problems such as insufficient deployment space and the need for customization, thus limiting their applicability.
[0005] Therefore, there is an urgent need for a new type of intra-aortic branched covered stent to solve the above problems. Utility Model Content
[0006] To address the shortcomings of existing technologies, this utility model provides a limited aortic endovascular stent graft, which solves the problems of existing technologies, such as the need to pre-reserve branch vessel opening diameters on the endovascular stent graft or branch stents, and the limited applicability of stents due to the different physiological characteristics of individuals.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A limited aortic endovascular stent graft includes a frame made of woven metal wire in the shape of a hollow mesh cylinder. The mesh intersections of the frame are fixed by welding. The outer wall of the frame is connected to a endovascular graft via connecting components, which can cover lesions at multiple angles and quadrants. Identification marks are set around the periphery of the endovascular graft. The inner periphery of the identification marks is fixedly connected to the outer periphery of the frame. The outer periphery of the identification mark on the left end and the identification marks at the front and rear ends is marked with the number "8", and the outer periphery of the identification mark on the right end is marked with the number "0", so that medical staff can determine the boundary of the endovascular graft using imaging equipment and adjust the stent angle to face the vascular rupture.
[0009] Preferably, the connecting assembly includes a connector one fixedly connected to the inner circumference of the film, the connector one being fitted onto the metal wire portion of the frame, and a fixing hoop provided on the outer wall, a positioning part fixedly connected to the middle end of the fixing hoop, the positioning part being located inside the opening of the connector one, and snap-fit connectors fixedly connected to both ends of the fixing hoop, and grooves being provided on both sides of the outer wall of the connector one, with the snap-fit connectors snapping into the inside of the grooves.
[0010] Preferably, the connecting assembly further includes a second connector fixedly connected to the inner circumference of the film. The second connector is sleeved on the metal wire portion of the frame. Both ends of the second connector are provided with limiting portions, which are fixedly connected to the metal wire portion of the frame. A force-applying portion is fixedly connected to the inner circumference of the second connector.
[0011] Preferably, the metal wire is made from any one of the following raw materials: high-strength shape memory alloys, including nickel-titanium alloys, or high-strength metals, including cobalt-chromium alloys and stainless steel.
[0012] Preferably, the coating is prepared using either PTFE or polyester as the raw material.
[0013] Preferably, the inner circumference length of the membrane is 1 / 4 of the cross-sectional circumference length of the frame.
[0014] A method for using a limited aortic endovascular stent graft includes the following steps:
[0015] Step 1: Keep the frame in a retracted state, and keep the film folded at this time;
[0016] Step 2: Work with auxiliary equipment such as balloons and sleeves to install the support frame;
[0017] Step 3: Insert the stent into the patient's aorta and, with the assistance of imaging equipment, confirm the direction of the stent until it reaches the lesion site. Medical staff use imaging equipment to determine the endovascular boundary and identify the markers, adjust the stent angle to face the vascular rupture, and use appropriate expansion methods to expand the stent.
[0018] Step 4: The endovascular membrane expands and unfolds along with the scaffold, and is then applied to the ruptured blood vessel.
[0019] Preferably, the folding state of the film includes both single-fold folding and multi-fold folding.
[0020] Preferably, the expansion method in step three is selected as follows:
[0021] For frames made of high-strength shape memory alloys, the properties of shape memory alloys are used to make the frames expand on their own;
[0022] For frames made of high-strength metal, balloons are used to inflate the frame and expand it.
[0023] Preferably, the determination of the support angle in step four is based on:
[0024] When you see two "8"s, the center of the coating is facing forward in the developing equipment;
[0025] When you see an "8", the center of the film is located to the left of the center line of the long axis of the support.
[0026] When you see "0", the center of the film is located to the right of the center line of the long axis of the support.
[0027] If no markings are visible, the center of the coating should face away from the developing equipment.
[0028] This invention provides a limited aortic endovascular stent graft. It has the following beneficial effects:
[0029] This invention effectively seals vascular ruptures by localized covering, based on the fact that the stent's hollow structure does not obstruct the flow of branch vessels. It eliminates the need for additional fenestration and positioning of branch stents, making the stent structure simple, easy to operate, and requiring no customization. It is applicable to aortic and branch vessel structures with various physiological structures, greatly improving the flexibility and convenience of the stent. Attached Figure Description
[0030] Figure 1 This is a perspective view of the present utility model;
[0031] Figure 2 This is a schematic diagram of the left side structure of this utility model;
[0032] Figure 3 This is a schematic diagram of the right side of the present invention.
[0033] Figure 4 This is a schematic diagram of the retractable support structure of this utility model. Figure 1 ;
[0034] Figure 5 This is a schematic diagram of the connection structure between the support and the membrane of this utility model. Figure 1 ;
[0035] Figure 6 This is a schematic diagram of the structure of the connector of this utility model;
[0036] Figure 7 This is a schematic diagram of the retractable support structure of this utility model. Figure 2 ;
[0037] Figure 8 This is a schematic diagram of the connection structure between the support and the membrane of this utility model. Figure 2 ;
[0038] Figure 9 This is a schematic diagram of the structure of connector two of this utility model;
[0039] Figure 10 This is a schematic diagram of a wave-shaped bare support structure.
[0040] The components include: 1. frame; 2. membrane; 3. connector one; 4. fixing hoop; 5. positioning part; 6. snap connector; 7. connector two; 8. force application part; 9. limiting part; and 10. identification mark. Detailed Implementation
[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0042] Example 1:
[0043] As part of this application, please refer to the appendix. Figure 1 -Appendix Figure 6This utility model provides a limited aortic endovascular stent graft, including a stent body 1. The stent body 1 is made of woven metal wire and has a hollow mesh-like cylindrical shape. The mesh intersections of the stent body 1 are fixed by welding. A connector head 3, which is fixedly connected to the inner circumference of the endovascular stent graft 2, is sleeved on the metal wire portion of the stent body 1. A fixing clamp 4 is provided on the outer wall. A positioning part 5 is fixedly connected to the middle end of the fixing clamp 4. The positioning part 5 is located inside the opening of the connector head 3. Both ends of the fixing clamp 4 are fixedly connected to clamping heads 6. Grooves are provided on both sides of the outer wall of the connector head 3, and the clamping heads 6 engage with the clamping heads. Inside the groove, the covering 2 covers lesions at multiple angles and quadrants. Identification marks 10 are set around the periphery of the covering 2. The inner periphery of the identification marks 10 is fixedly connected to the outer periphery of the frame 1. The outer periphery of the left identification mark 10 and the front and rear identification marks 10 is marked with the number "8". The outer periphery of the right identification mark 10 is marked with the number "0". This allows medical staff to determine the boundary of the covering 2 through imaging equipment and adjust the angle of the stent to face the vascular rupture. The identification marks 10 do not fold as the frame 1 contracts to maintain visibility.
[0044] Specifically, there are multiple fixing structures for the film covering 2, which correspond to the metal wires on the frame 1 corresponding to the area of the film covering 2, so that the film covering 2 can fold and unfold with the contraction and expansion of the frame 1. When fixing the film covering 2 to the frame 1, the connector 3 is clipped onto the metal wire part, and then the fixing hoop 4 is put on the outer wall of the connector 3, and the clamping head 6 is clipped into the inside of the groove. The fixing hoop 4 is pressed and fixed along the position of the clamping head 6.
[0045] The metal wire is made from any of the high-strength shape memory alloys, including nickel-titanium alloys, to achieve a balloon-free self-expansion and recovery method to dilate the patient's aorta.
[0046] The coating 2 is made of either PTFE or polyester as raw material, and the inner circumference of the coating 2 is 1 / 4 of the cross-sectional circumference of the frame 1.
[0047] Based on the aforementioned limited aortic endovascular stent graft, as another aspect of this application, a method of using a limited aortic endovascular stent graft includes the following steps:
[0048] Step 1: Keep frame 1 in a retracted state, while cover film 2 remains in a single fold.
[0049] Step 2: Work with auxiliary equipment such as balloons and sleeves to install the support frame;
[0050] Step 3: Insert the stent into the patient's aorta and, with the assistance of imaging equipment, confirm the direction of the stent until it reaches the lesion site. Medical staff use imaging equipment to determine the boundary of the endothelial 2 and the identification mark 10, adjust the stent angle so that it faces the vascular rupture, and use an appropriate expansion method to expand the stent body 1. The expansion method selected is: for the stent body 1 made of high-strength shape memory alloy, the characteristics of the shape memory alloy are used to make the stent body 1 expand on its own.
[0051] The determination of the bracket angle is based on:
[0052] When you see two "8"s, the coating 2 center is facing forward in the developing equipment;
[0053] When you see an "8", the center of the film 2 is located to the left of the center line of the long axis of the support.
[0054] When you see "0", the center of the film 2 is located to the right of the center line of the long axis of the support.
[0055] If no markings are visible, the center of the coating 2 faces away from the developing equipment.
[0056] Step 4: As the scaffold expands, the membrane 2 unfolds and is applied to the ruptured blood vessel.
[0057] Example 2:
[0058] As part of this application, please refer to the appendix. Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 7 Appendix Figure 8 and attached Figure 9 This utility model provides a limited aortic endovascular stent graft, including a stent body 1. The stent body 1 is made of woven metal wire and has a hollow mesh-like shape. The mesh intersections of the stent body 1 are fixed by welding. A connecting head 2 is fixedly connected to the inner circumference of the endovascular stent graft 2 and is sleeved on the metal wire portion of the stent body 1. Both ends of the connecting head 2 are provided with limiting portions 9, which are fixedly connected to the metal wire portion of the stent body 1. A force-applying portion 8 is fixedly connected to the inner circumference of the connecting head 2. The endovascular stent graft 2 can cover multiple angles. For lesions in the quadrant, identification marks 10 are set around the periphery of the covering 2. The inner periphery of the identification mark 10 is fixedly connected to the outer periphery of the frame 1. The left identification mark 10 and the outer periphery of the front and rear identification marks 10 are marked with the number "8", and the outer periphery of the right identification mark 10 is marked with the number "0". This allows medical staff to determine the boundary of the covering 2 through imaging equipment and adjust the angle of the stent to face the vascular rupture. The identification mark 10 will not fold with the contraction of the frame 1 to maintain visibility.
[0059] Specifically, there are multiple fixing structures for the film covering 2, which correspond to the metal wires on the frame 1 corresponding to the area of the film covering 2, so that the film covering 2 can be folded and unfolded as the frame 1 shrinks and expands. When fixing the film covering 2 to the frame 1, the connector 2 is sleeved on the metal wire part and positioned between the two limiting parts 9 for limiting. Then, the opening of the connector 7 is closed and the metal wire is clamped by the force applying part 8 as the force applying point, thus fixing the connector 7.
[0060] The metal wire is made from any of the high-strength metals, including cobalt-chromium alloys and stainless steel, to maintain its shape after balloon inflation.
[0061] The coating 2 is made of either PTFE or polyester as raw material, and the inner circumference of the coating 2 is 1 / 4 of the cross-sectional circumference of the frame 1.
[0062] Based on the aforementioned limited aortic endovascular stent graft, as another aspect of this application, a method of using a limited aortic endovascular stent graft includes the following steps:
[0063] Step 1: Keep the frame 1 in a retracted state, while the film 2 remains folded and wrinkled.
[0064] Step 2: Work with auxiliary equipment such as balloons and sleeves to install the support frame;
[0065] Step 3: Insert the stent into the patient's aorta and, with the assistance of imaging equipment, confirm the direction of the stent until it reaches the lesion site. Medical staff use imaging equipment to determine the boundary of the endothelial 2 and the identification mark 10, adjust the stent angle so that it faces the vascular rupture, and use an appropriate expansion method to expand the stent body 1. The expansion method selected is: for the stent body 1 made of high-strength metal, use balloon inflation to expand the stent body 1.
[0066] The determination of the bracket angle is based on:
[0067] When you see two "8"s, the coating 2 center is facing forward in the developing equipment;
[0068] When you see an "8", the center of the film 2 is located to the left of the center line of the long axis of the support.
[0069] When you see "0", the center of the film 2 is located to the right of the center line of the long axis of the support.
[0070] If no markings are visible, the center of the coating 2 faces away from the developing equipment.
[0071] Step 4: As the scaffold expands, the membrane 2 unfolds and is applied to the ruptured blood vessel.
[0072] Since most aortic ruptures are transverse, the membrane 2 in both embodiments of this invention is preferably rectangular in structure, which can meet the sealing and repair function of most transverse ruptures.
[0073] Furthermore, although the two embodiments of the present invention use a mesh structure bare support as an example to illustrate the principle and spirit of the present invention, the connection components provided by the present invention are also applicable to other bare support structures related in the art, including wave structure bare support.
[0074] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A limited aortic endovascular stent graft, characterized in that, The device includes a frame (1), which is woven from metal wire and has a hollow mesh-like cylindrical shape. The mesh intersections of the frame (1) are fixed by welding. The outer wall of the frame (1) is connected to a covering (2) by a connecting component, which can cover lesions at multiple angles and quadrants. Identification marks (10) are set around the covering (2). The inner periphery of the identification marks (10) is fixedly connected to the outer periphery of the frame (1). The outer periphery of the left identification mark (10) and the front and rear identification marks (10) are marked with the number "8". The outer periphery of the right identification mark (10) is marked with the number "0". This allows medical staff to determine the boundary of the covering (2) through imaging equipment and adjust the angle of the stent to face the rupture of the blood vessel.
2. The limited aortic endovascular stent graft according to claim 1, characterized in that, The connecting assembly includes a connector one (3) fixedly connected to the inner circumference of the film (2). The connector one (3) is sleeved on the metal wire part of the frame (1) and a fixing hoop (4) is provided on the outer wall. A positioning part (5) is fixedly connected to the middle end of the fixing hoop (4). The positioning part (5) is located inside the opening of the connector one (3). Both ends of the fixing hoop (4) are fixedly connected to clamping heads (6). Grooves are provided on both sides of the outer wall of the connector one (3), and the clamping heads (6) are clamped inside the grooves.
3. A limited aortic endovascular stent graft according to claim 1, characterized in that, The connecting assembly further includes a second connector (7) fixedly connected to the inner circumference of the film (2). The second connector (7) is sleeved on the metal wire portion of the frame (1). Both ends of the second connector (7) are provided with limiting portions (9). The limiting portions (9) are fixedly connected to the metal wire portion of the frame (1). The inner circumference of the second connector (7) is fixedly connected with a force-applying portion (8).
4. A limited aortic endovascular stent graft according to claim 1, characterized in that, The metal wire is made from any one of the following raw materials: high-strength shape memory alloys, including nickel-titanium alloys, or high-strength metals, including cobalt-chromium alloys and stainless steel.
5. A limited aortic endovascular stent graft according to claim 1, characterized in that, The coating (2) is prepared by using either PTFE or polyester as raw material.
6. A limited aortic endovascular stent graft according to claim 1, characterized in that, The inner circumference of the membrane (2) is 1 / 4 of the cross-sectional circumference of the frame (1).
7. A limited aortic endovascular stent graft according to claim 6, characterized in that, The folding state of the film (2) includes two states: single fold and multiple fold.