A tubular medical device and a tubular medical system comprising the same
Patent Information
- Application Number
- CN202311474924.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-07
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2043-11-07
AI Technical Summary
[0005]而为了增加管状支架的可视性(又称不透射线性)或其他功能(如辅助血栓嵌合或辅助血栓抓取)，经常在管状支架上设置不透射线机构或其他功能机构，而这种机构的设置往往会增大管状支架输送时与输送导管之间的阻力，使得管状支架在导管中输送过程的顺滑性降低
[0049] The tubular medical device provided in this application is equipped with an extension device to give it functionality according to actual conditions, thus becoming a functional mechanism; by setting the radial dimension of the location of the extension device, the smoothness of the tubular medical device during transportation is ensured; by setting the extension device to extend axially towards the support body and at a certain angle to the axial direction, radial support force is provided for the tubular medical device.
Smart Images
Figure CN119950137B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of vascular stent-assisted structures, specifically relating to a tubular medical device and a tubular medical system comprising the same. Background Technology
[0002] Neurointerventional medicine, supported by digital subtraction angiography (DSA) systems, utilizes endovascular catheter manipulation techniques to diagnose and treat lesions affecting the neurovascular system through selective angiography, interventional embolization, dilation and angioplasty, mechanical debridement, and drug delivery. Based on their functions and applications, neurointerventional medical devices can be categorized into three main types: hemorrhagic stroke treatment, ischemic stroke treatment, and access devices. Hemorrhagic stroke treatment products are primarily used to treat intracranial aneurysms and occlude malformed vessels, while ischemic stroke treatment products are mainly used to treat acute ischemic stroke and cerebrovascular occlusive diseases (such as intracranial arteriosclerosis). Currently, various self-expanding stents have been developed for treating neurovascular diseases, such as flow-directing mesh stents, coil-assisted stents, intracranial thrombectomy stents, and intracranial stents.
[0003] In clinical applications, the tubular stent is first radially compressed and loaded into a microcatheter, then delivered to the lesion site. The microcatheter is then withdrawn, and the stent is opened, allowing it to expand outwards to achieve purposes such as thrombectomy and vascular support. For thrombectomy stents, after placement in the blocked vessel, the thrombus can be embedded in the stent's basket structure, and the operator immediately withdraws the thrombectomy stent with the thrombus-grabbing attachment. For intracranial stents, after reaching the lesion, the stent expands radially to support the narrowed vessel.
[0004] Because intracranial blood vessels typically have a small diameter, the microcatheters used to deliver devices also usually have a small diameter to improve the safety of establishing access. This places high demands on the smoothness of tubular stent delivery within the catheter.
[0005] To increase the visibility (also known as radiopaque linearity) or other functions of tubular stents (such as assisting in thrombus embedding or thrombus retrieval), radiopaque mechanisms or other functional mechanisms are often incorporated into the stent. However, the inclusion of such mechanisms tends to increase the resistance between the stent and the delivery catheter during stent delivery, reducing the smoothness of stent delivery within the catheter. The lower the smoothness of stent delivery within the catheter, the greater the deformation of the stent, and the worse the medical efficacy of the stent. For example, the thrombectomy stent may have a poorer thrombus embedding effect after release at the lesion site, or the vascular support of intracranial stents at the lesion site may be reduced.
[0006] Therefore, there is a need in the art to provide a tubular support with a functional mechanism (such as a non-transparent component) and good transport smoothness and radial support after release. Summary of the Invention
[0007] To address the shortcomings of existing technologies, one objective of this invention is to provide a tubular medical device comprising a cylindrical support body with a perforated mesh and an extension device fixedly connected to the support body.
[0008] The tubular medical device includes at least one normally restrained state and an intravascular release state;
[0009] The tubular medical device is radially compressed in its normal restraint state, and the extension device extends along the axial direction of the support body; the cross section perpendicular to the axial direction at the proximal end of the extension device is surface P1, and the cross section perpendicular to the axial direction at the distal end of the extension device is surface P2. In the normal restraint state, the outer diameter of the tubular medical device between surfaces P1 and P2 is less than or equal to the outer diameter of the tubular medical device outside surfaces P1 and P2.
[0010] The tubular medical device expands radially in the released state, and the extension device extends from the proximal end to the distal end towards the axis and distal end of the cylindrical support body, and the extension device is at a certain angle to the axial direction.
[0011] The tubular medical device provided in this application is equipped with an extension device to provide functionality according to actual conditions, thus becoming a functional mechanism; by setting the radial dimension of the location of the extension device, the smoothness of the tubular medical device during delivery is ensured; by setting the extension device to extend axially toward the stent body and at a certain angle to the axial direction, the tubular medical device will not protrude outside the stent body when released into the blood vessel.
[0012] The extension device described in this application extends axially toward the stent body and at a certain angle to the axial direction, so that the extension device is always inside the stent body, whether the tubular medical device is in a tortuous or straight blood vessel, and will not go deep into the stent body and cause damage to the blood vessel.
[0013] In one specific embodiment, the outer diameter of the cylindrical support body when fully compressed is the first diameter;
[0014] The outer diameter of the cylindrical stent body in the intravascular release state is the second diameter, and the extension device extends from the proximal end to the distal end towards the axis and distal end of the cylindrical stent body, with an extension angle of the first angle.
[0015] The outer diameter of the cylindrical support body in its normal constrained state is the third diameter, and the extension device extends from the proximal end to the distal end toward the axis and distal end of the cylindrical support body, with an extension angle of the second angle.
[0016] The first diameter is smaller than the third diameter, which is smaller than the second diameter;
[0017] The first angle is smaller than the second angle.
[0018] The extension angle is defined as the angle between the extension device and the axis extending from the far end of the extension device to the far end, with the far end of the extension device as the corner vertex.
[0019] In this application, the inner diameter of the stent body is close to 0 when it is in the fully compressed state; the intravascular release state is understood as the state in which the stent body is released into the blood vessel; the normally restrained state is understood as the state in which the stent body is restrained in the delivery line and is restrained by the delivery line.
[0020] The binding state described in this application typically depends on the inner diameter of the delivery tube. Those skilled in the art can select a suitable tube as the delivery tube to bind the tubular medical device based on the design requirements of the tubular medical device, such as the size and curvature of the blood vessels at the location of the lesion.
[0021] Preferably, multiple extension devices with overlapping portions in the circumferential direction constitute an extension unit; the distal ends of multiple extension devices in the same extension unit converge together, and the intersection of the convergence points is the convergence end.
[0022] To incorporate functional components into tubular medical devices without increasing delivery resistance within catheters, it may be necessary to sacrifice the radial support force after expansion. This reduced radial support force can hinder the device's therapeutic efficacy, such as impaired thrombus embedding, increased difficulty in vascular foreign body removal, or compromised stent apposition, reducing the therapeutic effect on vascular stenosis. By converging the distal ends of the same extension unit, and extending inwards at an angle to the axial direction, the extensions provide a radially distributed force when the stent body is subjected to radial pressure, offering radial support for the tubular medical device. Simultaneously, the converging ends allow the forces from different extensions to interact during radial compression, better providing force towards the vessel wall and increasing the radial support force of the stent body. This makes it easier for the tubular medical device to achieve its medical objectives, such as better thrombectomy stent embedding of thrombi, easier removal of foreign bodies from the vessel, and more stable radial support for intracranial stents.
[0023] Preferably, the extension device includes a connecting column extending from a cylindrical support body, an extension wire, and a connecting part that fixes the distal end of the connecting column and the proximal end of the extension wire. The distal ends of multiple extension wires in the same extension unit converge together, and the convergence point is the convergence end.
[0024] In one specific embodiment, the hollowed-out grid of the cylindrical support body includes a basic grid;
[0025] The basic grid includes four support columns, two axial intersection columns, and two circumferential intersection columns; along the edge of the basic grid, starting from the near end, the basic grid includes a first axial intersection column, a first support column, a first circumferential intersection column, a second support column, a second axial intersection column, a third support column, a second circumferential intersection column, and a fourth support column;
[0026] The main structure of the hollowed-out mesh is obtained by arranging the basic mesh through shared support columns or connecting columns;
[0027] The distance between the P1 and P2 surfaces is less than the length of the base mesh along the axial direction.
[0028] Preferably, the two basic grids of adjacent shared support columns are defined as deformable grid cells, and the intersection columns connected to the shared support columns are defined as connectable points;
[0029] When the deformable mesh unit does not have a common support column, the deformable mesh unit is a deformable mesh; or, when the radial dimension of the common support column of the deformable mesh unit is reduced, the deformable mesh unit is a deformable mesh.
[0030] A mid-section extension device is provided at the connectable point of the deformable mesh.
[0031] In a preferred embodiment, the mid-section extension device is disposed at a connectable point of the common support column where the deformable mesh is removed, preferably at a connectable point near the end of the common support column where the deformable mesh is removed.
[0032] Preferably, under normal restraint, the length of the mid-section extension device is L1, and the shortest length from the connectable point to the farthest junction post of the deformable mesh along the edge of the deformable mesh is L2, and L1 is less than L2.
[0033] L1 being smaller than L2 increases the range of radial dimensions that can be selected for the mid-section extension device, providing better radial support for the tubular medical device when it is in the released state.
[0034] Preferably, the hollowed-out grid at the farthest end of the cylindrical support body is the far-end base grid, and the second axial intersecting column of the far-end base grid is provided with a far-end extension device facing the far end direction.
[0035] For visualization of the tubular medical device, in order to determine whether the landing point of the distal end of the tubular medical device is appropriate and whether it is at the distal end of the lesion, the distal end of the tubular medical device is usually visualized. Therefore, the tubular medical device described in this application preferably has a distal extension device provided at the distal end of the tubular medical device.
[0036] Preferably, in the normally constrained state, the converging end is located on the central axis of the cylindrical support body.
[0037] Preferably, the reduction in the radial dimension of the deformable mesh relative to the deformable mesh element is defined as a compensation amount;
[0038] In the extension unit composed of the mid-section extension devices, at any cross-section perpendicular to the axial direction, the sum of the radial dimensions of all the mid-section extension devices constituting the extension unit is less than or equal to the compensation amount.
[0039] Compared to the two adjacent base grids, the deformed grid has one less common support column or a smaller radial dimension of the common support column. The removal or reduction of the size of the common support column results in a reduction of the radial dimension in the fully contracted state, and this reduction is defined as the compensation amount.
[0040] Within the same extension unit, the sum of the radial dimension increases of the intermediate extension devices is set to be less than the compensation amount, thereby ensuring that the tubular medical device will not experience increased transport resistance in the pipeline due to the installation of the intermediate extension devices, thus affecting the smoothness of transport.
[0041] Preferably, the elongating filament is made of a non-transparent material, and the connecting part is a non-transparent loop.
[0042] The use of non-transparent materials provides visibility. In the extension device described in this application, at least the elongating filament is made of a non-transparent material. The connecting part of the extension device and the converging end of the extension unit can be independently selected to use a non-transparent material to obtain a clearer visualization effect.
[0043] Preferably, the planar structure of the basic grid is an axisymmetric or centrally symmetric figure.
[0044] The second objective of this application is to provide a tubular medical system, comprising:
[0045] One of the purposes is the tubular medical device described above;
[0046] The push wire is connected to the proximal end of the tubular medical device;
[0047] A catheter used to deliver the tubular medical device.
[0048] Compared with the prior art, this application has the following beneficial effects:
[0049] The tubular medical device provided in this application is equipped with an extension device to give it functionality according to actual conditions, thus becoming a functional mechanism; by setting the radial dimension of the location of the extension device, the smoothness of the tubular medical device during transportation is ensured; by setting the extension device to extend axially towards the support body and at a certain angle to the axial direction, radial support force is provided for the tubular medical device. Attached Figure Description
[0050] Figure 1 A schematic diagram of the intravascular release state structure of the tubular medical device provided in Example 1;
[0051] Figure 2 This is an enlarged schematic diagram of the structure of the intravascular release extension unit of the tubular medical device provided in Example 1.
[0052] Figure 3 A schematic diagram of the tubular medical device in its typically restrained state as provided in Example 1;
[0053] Figure 4 An enlarged structural diagram of the extension unit portion of the tubular medical device in its typically constrained state, as provided in Example 1.
[0054] Figure 5 A schematic diagram of the unfolded structure of the support body 100 of a tubular medical device;
[0055] Figure 6 One specific implementation of the basic grid 120;
[0056] Figure 7 Another specific implementation of the basic grid 120;
[0057] Figure 8 Another specific implementation of the basic grid 120;
[0058] Figure 9 This is yet another specific implementation of the basic grid 120;
[0059] Figure 10 This is a schematic diagram of the deformation method from the basic mesh 120 to the deformed mesh 130 in Example 1;
[0060] Figure 11 A schematic diagram of the unfolded structure of the middle section of the stent body 100 of a tubular medical device; Figure 12 This is a schematic diagram of the deformation method from the basic mesh 120 to the deformed mesh 130 in Example 2. Detailed Implementation
[0061] The technical solution of the present invention will be further explained and described below with reference to specific embodiments. However, it should be noted that the specific embodiments are only a specific implementation and explanation of the essence of the technical solution of the present invention, and should not be construed as a limitation on the scope of protection of the present invention.
[0062] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.
[0063] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0064] In the description of this application, it should be understood that the terms "distal" and "proximal" should be understood as viewed from the perspective of the surgical operator, with "distal" being the end furthest from the surgical operator and "proximal" being the end closest to the surgical operator. The term "axial" should be understood as the direction of stent delivery or the length of the guidewire; "radial" should be understood as the direction perpendicular to the "axial" direction; and "circumferential" should be understood as the circumferential direction, i.e., the direction around the length of the stent, which is perpendicular to the axial direction and also perpendicular to the cross-sectional radius.
[0065] In the description of this application, it should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.
[0066] Example 1
[0067] like Figures 1-5 ( Figure 1 This is a schematic diagram of the tubular medical device in its intravascular release state as provided in Example 1. Figure 2 This is an enlarged schematic diagram of the structure of the intravascular release extension unit of the tubular medical device provided in Example 1. Figure 3 This is a schematic diagram of the tubular medical device provided in Example 1 in its typical constrained state. Figure 4 This is an enlarged structural diagram of the extension unit portion of the tubular medical device in its typically constrained state, as provided in Example 1. Figure 5 As shown in the schematic diagram of the unfolded structure of the support body 100 of the tubular medical device, Embodiment 1 provides a tubular medical device, including:
[0068] A cylindrical support body 100 with a hollowed-out mesh, and three intermediate extension devices fixedly connected to the support body 100: a first extension device 210, a second extension device 220, and a third extension device 230, which together form an extension unit 200. The radial dimension of the cylindrical support body 100 in a fully compressed state is a first diameter D1.
[0069] The tubular medical device includes a normally bound state and an intravascular release state during use; the normally bound state can be understood as the state in which it is bound in the delivery tubing; the intravascular release state can be understood as the state in which the tubular medical device is released from its binding in the blood vessel. In this state, the tubular medical device usually expands radially to contact the inner wall of the blood vessel, that is, it will be bound by the blood vessel.
[0070] To illustrate the structure of the tubular medical device, this application further defines two states: a fully compressed state and a fully released state. The fully compressed state can be understood as the tubular medical device being completely compressed radially, with an inner diameter of 0; the fully released state can be understood as the tubular medical device being completely and naturally expanded without being restrained by any external force.
[0071] The cylindrical stent body 100 expands radially to a second diameter D2 in the intravascular release state, and the first extension device 210, the second extension device 220 and the third extension device 230 all extend from the proximal end to the distal end towards the axis 110 and distal end of the cylindrical stent body 100, and the extension angle is a first angle α1.
[0072] The cylindrical support body 100 is radially compressed to a third diameter D3 in a normal restraint state, and the first extension device 210, the second extension device 220 and the third extension device 230 all extend from the proximal end to the distal end towards the axis 110 and the distal end of the cylindrical support body 100, and the extension angle is the second angle α2; the proximal ends of the first extension device 210, the second extension device 220 and the third extension device 230 all have a cross section perpendicular to the axial direction 001, and the cross section closest to the proximal end is the P1 surface; the distal ends of the first extension device 210, the second extension device 220 and the third extension device 230 converge together to form a converging end 201, and the cross section perpendicular to the axial direction 001 at the distal end of the converging end 201 is the P2 surface; in a normal restraint state, the outer diameter of the tubular medical device between the P1 surface and the P2 surface is less than or equal to the outer diameter of the tubular medical device outside the P1 surface and the P2 surface.
[0073] The first diameter D1 is smaller than the third diameter D3, which is smaller than the second diameter D2;
[0074] The first angle α1 is smaller than the second angle α2.
[0075] In Example 1, the first diameter D1 is 0.381 mm, the third diameter D3 is 0.533 mm, and the second diameter D2 (in nominal diameter) is 4.000 mm; the first angle α1 is 120°, and the second angle α2 is 173°.
[0076] In other specific embodiments, the first diameter D1, the third diameter D3, the second diameter D2, the first angle α1 and the second angle α2 can be adjusted according to the actual situation, and the second diameter D2 is calculated based on the nominal diameter.
[0077] from Figure 5 It can be seen that the hollowed-out grid of the cylindrical support body 100 of the tubular medical device provided in Example 1 includes a basic grid 120 and a deformed grid 130.
[0078] The basic grid 120 includes four support columns, two axial intersection columns, and two circumferential intersection columns; along the edge of the basic grid, starting from the near end, the basic grid 120 includes a first axial intersection column 121, a first support column 122, a first circumferential intersection column 123, a second support column 124, a second axial intersection column 125, a third support column 126, a second circumferential intersection column 127, and a fourth support column 128.
[0079] The basic grid can be an axisymmetric, centrally symmetric, or asymmetric shape. Figure 6 , Figure 7 , Figure 8 and Figure 9 ( Figure 6 One specific implementation of the basic grid 120 Figure 7 Another specific implementation of the base grid 120, Figure 8 Another specific implementation of the base grid 120, Figure 9 (Another specific implementation of the basic mesh 120) provides schematic diagrams of four basic mesh shapes. During the design process, those skilled in the art can select according to the actual situation. Figure 6 , Figure 7 , Figure 8 and / or Figure 9 Any one or two of the given basic mesh shapes can be combined. Those skilled in the art may also choose other basic mesh shapes.
[0080] like Figure 5As shown, the main structure of the hollow mesh is obtained by arranging the basic mesh 120 through shared support columns or intersecting columns; the hollow mesh also includes deformable meshes 130, which are obtained by deforming the basic mesh 120 of adjacent shared support columns. One exemplary way of deforming the basic mesh 120 into the deformable mesh 130 is as follows: Figure 10 ( Figure 10 A schematic diagram of the deformation method of the basic mesh 120 to the deformed mesh 130 in Embodiment 1 is given: two adjacent basic meshes, the first basic mesh 1201 and the second basic mesh 1202, share a support column 1203. After the shared support column 1203 is removed, the first basic mesh 1201 and the second basic mesh 1202 are deformed into a single deformed mesh 130. The near-end junction column connected to the removed shared support column 1203 is defined as a connectable point 1204.
[0081] In other specific embodiments, the deformation of the base grid 120 into the deformed grid 130 can also be as follows: two adjacent base grids, the first base grid 1201 and the second base grid 1202, share a support column 1203, the radial dimension of the shared support column 1203 is reduced, and the first base grid 1201 and the second base grid 1202 together form a deformed grid 130.
[0082] The first extension device 210, the second extension device 220, and the third extension device 230 are three different extension devices, each disposed in three different deformable grids. They have the same structure, placement method, and selection range. Only the first extension device 210 is described as an example. The first extension device 210 includes a connecting post 202 extending from a cylindrical support body, an elongating wire 203, and a connecting portion 204 fixing the distal end of the connecting post 202 and the proximal end of the elongating wire 203. The first extension device 210 is disposed at a connectable point 1204 near the proximal end of the common support post 1203 in the deformable grid 130 where the common support post 1203 is removed.
[0083] The method of converging the distal ends of the extension devices in the same extension unit can be selected by those skilled in the art according to the actual situation. Taking the extension unit composed of the first extension device 210, the second extension device 220 and the third extension device 230 as an example, the converging method is explained as follows: The first extension device 210, the second extension device 220 and the third extension device 230 each have one elongating filament, for a total of 3 elongating filaments. The distal ends of the 3 elongating filaments are converged by winding, preferably by winding with non-transparent wire; or the 3 elongating filaments are converged by converging in a converging component such as a ring component, preferably a non-transparent ring; or the 3 filaments are directly laser-engraved to have three claw-foot filaments at one end, while the other end is not engraved and remains as a single filament, so that the three claw-foot filaments converge into a single filament, thereby achieving the convergence of the three claw-foot filaments. In this scheme, the 3 claw-foot filaments correspond to the 3 elongating filaments.
[0084] In other alternative embodiments, the extension unit may have only two extension devices. In this case, the elongating filaments of the two extension devices in the extension unit may be configured to be obtained by bending a single filament, with the bending part being the converging end and the filaments on both sides of the bending part being elongating filaments.
[0085] It should be noted that the deformation of the basic mesh 120 to the deformed mesh 130 described in this application is only for the purpose of clearly illustrating the shape of the deformed mesh, and is not a limitation on the formation process of the deformed mesh 130. Under normal circumstances, the deformed mesh 130 can be directly engraved during the laser engraving process of the support body, without the need for actual operation steps (such as cutting) to remove the common support column 1203.
[0086] Taking the first extension device 210 as an example again, in the normal restraint state, the length of the first extension device 210 is L1, and the shortest length from the connectable point 1204 to the farthest intersection post of the deformable mesh 130 along the edge of the deformable mesh is L2, and L1 is less than L2.
[0087] like Figure 1 and Figure 5 As shown, in Embodiment 1, the farthest hollowed-out grid of the support body 100 is the far-end base grid 140. The second axial intersecting column 1405 of the far-end base grid 140 is provided with a far-end extension device facing the far end. The support body 100 provided in Embodiment 1 has three far-end base grids 140 at its far end. Each of the far-end base grids 140 is provided with a far-end extension device, namely the first far-end extension device 310, the second far-end extension device 320, and the third far-end extension device 330.
[0088] The radial dimensions of the mid-section extension device are explained as follows: To accommodate the corresponding deformable grid 130, the common support column 1203 is either eliminated or radially reduced in size. The change in the radial dimension of the support body 100 under normal restraint caused by this elimination or reduction is defined as a compensation amount. For the extension unit comprised of the mid-section extension device, under normal restraint, the radial dimension of the extension unit is less than or equal to this compensation amount. This arrangement ensures that regardless of the inner diameter of the delivery tubing, the tubular medical device will not experience increased delivery resistance due to the extension device.
[0089] The radial dimension of the distal extension device should be at least less than or equal to the radial dimension of the support body 100 in its normal restraint state.
[0090] For the mid-section extension device or distal extension device described in this application, at least its elongating filament is made of a non-transparent material, and the connecting part is made of a non-transparent loop.
[0091] Example 2
[0092] like Figure 11 ( Figure 11 As shown in the schematic diagram of the unfolded structure of the middle section of the support body 100 of the tubular medical device, the tubular medical device provided in Embodiment 2 differs from that in Embodiment 1 in that the shapes of the basic grid 120 and the deformed grid 130 are different. The basic grid 120 of Embodiment 2 is composed of... Figure 6 and Figure 7 The deformation mode of the deformable mesh 120 is the same as that in Example 1, such as... Figure 12 ( Figure 12 A schematic diagram of the deformation method from the base mesh 120 to the deformed mesh 130 in Embodiment 2 is shown. One exemplary deformation method from the base mesh 120 to the deformed mesh 130 is as follows: Figure 10 As shown: two adjacent basic grids, the first basic grid 1201 and the second basic grid 1202, share a support column 1203. After the shared support column 1203 is removed, the first basic grid 1201 and the second basic grid 1202 are deformed into a deformed grid 130. The proximal junction column connected to the removed shared support column 1203 is defined as a connectable point 1204.
[0093] This application also provides a tubular medical device system, comprising:
[0094] A tubular medical device as described in Example 1 or 2; a push wire connected to the proximal end of the tubular medical device; and a catheter for delivering the tubular medical device.
[0095] The catheter serves as the delivery route for the tubular medical device. During delivery, it can restrain the tubular medical device, keeping it in a normally restrained state. When the tubular medical device is pushed out of the catheter and released into the blood vessel, it is in a released state within the blood vessel.
[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A tubular medical device, characterized in that, The tubular medical device includes a cylindrical support body with a hollowed-out mesh and an extension device fixedly connected to the support body; The tubular medical device includes at least one normally restrained state and an intravascular release state; The tubular medical device is radially compressed in its normal restraint state, and the extension device extends along the axial direction of the support body; the cross section perpendicular to the axial direction at the proximal end of the extension device is surface P1, and the cross section perpendicular to the axial direction at the distal end of the extension device is surface P2. In the normal restraint state, the outer diameter of the tubular medical device between surfaces P1 and P2 is less than or equal to the outer diameter of the tubular medical device outside surfaces P1 and P2. The tubular medical device expands radially in the intravascular release state, and the extension device extends from the proximal end to the distal end towards the axis and distal end of the cylindrical stent body, and the extension device is at a certain angle to the axial direction. The hollowed-out mesh of the cylindrical support body includes a basic mesh; the basic mesh includes four support columns, two axial intersection columns, and two circumferential intersection columns; along the edge of the basic mesh, starting from the near end, the basic mesh includes a first axial intersection column, a first support column, a first circumferential intersection column, a second support column, a second axial intersection column, a third support column, a second circumferential intersection column, and a fourth support column; the main structure of the hollowed-out mesh is obtained by arranging the basic mesh through shared support columns or intersection columns; the distance between the P1 surface and the P2 surface is less than the axial length of the basic mesh; Two basic grids of adjacent shared support columns are defined as deformable grid cells, and the intersection columns connected to the shared support columns are defined as connectable points; when the deformable grid cell does not have a shared support column, the deformable grid cell is a deformable grid; or, when the radial dimension of the shared support column of the deformable grid cell decreases, the deformable grid cell is a deformable grid. A mid-section extension device is provided at the connectable point of the deformable mesh.
2. The tubular medical device as described in claim 1, characterized in that, The outer diameter of the cylindrical support body when fully compressed is the first diameter; The outer diameter of the cylindrical stent body in the intravascular release state is the second diameter, and the extension device extends from the proximal end to the distal end towards the axis and distal end of the cylindrical stent body, with an extension angle of the first angle. The outer diameter of the cylindrical support body in its normal constrained state is the third diameter, and the extension device extends from the proximal end to the distal end toward the axis and distal end of the cylindrical support body, with an extension angle of the second angle. The first diameter is smaller than the third diameter, which is smaller than the second diameter; The first angle is smaller than the second angle.
3. The tubular medical device as described in claim 1, characterized in that, Multiple extension devices with overlapping portions in the circumferential direction constitute one extension unit; The distal ends of multiple extension devices in the same extension unit converge together, and the intersection of the convergence is called the convergence end.
4. The tubular medical device as described in claim 1, characterized in that, The extension device includes a connecting column extending from a cylindrical support body, an elongating wire, and a connecting part that fixes the distal end of the connecting column and the proximal end of the elongating wire. The distal ends of multiple elongated filaments in the same extension unit converge together, and the point of convergence is called the converging end.
5. The tubular medical device as described in claim 1, characterized in that, The mid-section extension device is located at the connectable point of the common support column where the deformable grid is removed.
6. The tubular medical device as described in claim 1, characterized in that, The mid-section extension device is located at a connectable point near the end of the common support column where the deformable mesh has been removed.
7. The tubular medical device as described in claim 1, characterized in that, Under normal restraint, the length of the mid-section extension device is L1, and the shortest length from the connectable point to the farthest junction post of the deformable mesh along the edge of the deformable mesh is L2, and L1 is less than L2.
8. The tubular medical device as described in claim 1, characterized in that, The hollowed-out grid at the farthest end of the cylindrical support body is the far-end base grid, and the second axial intersection column of the far-end base grid is provided with a far-end extension device facing the far end direction.
9. The tubular medical device as described in claim 3 or 4, characterized in that, In its normally constrained state, the converging end is located on the central axis of the cylindrical support body.
10. The tubular medical device as described in claim 1, characterized in that, The reduction in the radial dimension of the deformable mesh relative to the deformable mesh element is defined as the compensation amount; In the extension unit composed of the mid-section extension devices, at any cross-section perpendicular to the axial direction, the sum of the radial dimensions of all the mid-section extension devices constituting the extension unit is less than or equal to the compensation amount.
11. The tubular medical device as described in claim 4, characterized in that, The elongating filament is made of a non-transparent material, and the connecting part is a non-transparent loop.
12. The tubular medical device as described in claim 1, characterized in that, The planar structure of the basic grid is an axisymmetric figure and a centrally symmetric figure.
13. A tubular medical system, characterized in that, The tubular medical system includes: The tubular medical device according to any one of claims 1 to 12; The push wire is connected to the proximal end of the tubular medical device; A catheter used to deliver the tubular medical device.
Citation Information
Patent Citations
Thrombectomy stent comprising developing unit
CN114617610A