Adjustable bending device and interventional medical system

Abstract

The utility model relates to a kind of adjustable bending device and interventional medical system, adjustable bending device includes pipe assembly and bending mechanism, pipe assembly includes first adjustable bending section and the second adjustable bending section connected to the proximal end of first adjustable bending section, bending mechanism connects pipe assembly and is used to adjust the bending degree of first adjustable bending section and second adjustable bending section.Interventional medical system, including adjustable bending device and medical device, adjustable bending device is used to deliver medical device into blood vessel.Interventional medical system, including adjustable bending device and brain protection device, brain protection device has the compression form in the lumen of pipe assembly and the inflation form that stretches out from the distal end opening of lumen.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an adjustable bending device and an interventional medical system. Background Technology

[0002] Minimally invasive techniques are widely used in vascular interventional surgery. By performing the surgery through small incisions or vascular punctures, patients' pain and recovery time are reduced, while also reducing the risk of surgical complications.

[0003] In interventional vascular surgery, a variety of different medical devices are typically used in combination. For example, delivery devices can be used to deliver guidewires, stents, and filters into the blood vessel, while the guidewire can also act as a guiding device to move the stent or filter within the vessel. Among these, the adjustable-bend catheter, as a delivery device, has the characteristic of adjustable curvature, and plays a crucial role, especially in the transfer of stents and filters between different communicating blood vessels.

[0004] Existing adjustable catheters have some shortcomings, such as a small range of adjustment, which makes it difficult to transfer the device between some more complex blood vessels. Utility Model Content

[0005] Therefore, it is necessary to provide an adjustable bending device and an interventional medical system to address the aforementioned technical problems.

[0006] An adjustable bending device, comprising: The pipe assembly includes a first adjustable bend and a second adjustable bend connected to the proximal end of the first adjustable bend; and A bending mechanism is connected to the pipe assembly and used to adjust the degree of bending of the first adjustable bend and the second adjustable bend.

[0007] In one embodiment, the ring stiffness of the first adjustable bending segment is N times the ring stiffness of the second adjustable bending segment, where 0 < N < 2; and / or

[0008] The first adjustable bending segment and the second adjustable bending segment are of the same length, and the first adjustable bending segment has greater adjustability than the second adjustable bending segment.

[0009] In one embodiment, the first adjustable bend includes a first tube and a first support embedded in the first tube, wherein the ring stiffness of the first support is greater than the ring stiffness of the first tube.

[0010] In one embodiment, the second adjustable bend includes a second tube and a second support embedded in the second tube.

[0011] In one embodiment, the second support member includes a distal support member and a proximal support member connected to the proximal end of the distal support member, wherein the distal support member is a hygroscopic tube or a mesh structure, and the proximal support member is a mesh structure.

[0012] In one embodiment, both the distal support and the proximal support are mesh structures. The mesh density of the distal support is greater than that of the proximal support; or The unit mesh area of ​​the distal support is smaller than that of the proximal support.

[0013] In one embodiment, the adjustable bending directions of the first adjustable bending segment and the second adjustable bending segment are the same or opposite.

[0014] In one embodiment, the axial length of the first adjustable bend is greater than the axial length of the second adjustable bend; or the axial length of the first adjustable bend is equal to the axial length of the second adjustable bend.

[0015] In one embodiment, the bending mechanism includes an adjusting wire assembly that connects the first adjustable bend and the second adjustable bend respectively. The adjusting wire assembly is at least partially slidable along the length of the tube assembly to control the degree of bending of the first adjustable bend and the second adjustable bend.

[0016] In one embodiment, the adjusting wire assembly includes a first adjusting wire and a second adjusting wire. The first adjusting wire is connected to the portion of the first adjustable bend near its distal end, and the second adjusting wire is connected to the portion of the second adjustable bend near its distal end. The first adjusting wire controls the degree of bending of the first adjustable bend by sliding along the length direction of the tube assembly, and the second adjusting wire controls the degree of bending of the second adjustable bend by sliding along the length direction of the tube assembly.

[0017] In one embodiment, the adjustable bending device includes a separating membrane attached to the inner surface of the tube assembly, the separating membrane having a separating cavity, and at least a portion of the adjusting wire assembly slidably passing through the separating cavity.

[0018] In one embodiment, the first adjustable bending section is a unidirectional adjustable bending section; or

[0019] The first adjustable bending section is a multi-directional adjustable bending section; or

[0020] The second adjustable bending section is a unidirectional adjustable bending section; or

[0021] The second adjustable bending section is a multi-directional adjustable bending section.

[0022] In one embodiment, the first adjustable bending segment and / or the second adjustable bending segment respectively include a first side and a second side in the circumferential direction, and the hardness of the first side is greater than the hardness of the second side.

[0023] In one embodiment, the opposite sides along one of the diameter directions of the pipe assembly are a first direction and a second direction, respectively, and the first adjustable bend is a unidirectional adjustable bend that is adjustable along the first direction. The second adjustable bend includes a first side and a second side, with the first side of the second adjustable bend disposed in a first direction of the second side.

[0024] In one embodiment, within the same cross-section of the first side and the second side, the circumferential length of the first side is greater than the circumferential length of the second side; or the circumferential length of the first side is equal to the circumferential length of the second side.

[0025] In one embodiment, the ratio of the length of the first adjustable bend to the length of the second adjustable bend is X, where 1 / 4 ≤ X ≤ 1; and / or

[0026] The sum of the axial lengths of the first adjustable bend and the second adjustable bend is Y, where 60mm ≤ Y ≤ 200mm.

[0027] An interventional medical system includes an adjustable bending device and a medical device, the adjustable bending device being used to deliver the medical device into a blood vessel.

[0028] In one embodiment, the medical device includes at least one of a filter, a stent, a vascular plug, a guidewire, and a catheter.

[0029] An interventional medical system includes an adjustable bending device and a brain protection device having a compressed configuration located within the lumen of the tubular assembly and an expanded configuration extending from a distal opening of the lumen.

[0030] Beneficial effects: By setting multiple adjustable bends in the tubular assembly, including a first adjustable bend and a second adjustable bend, and controlling the degree of bending of the first and second adjustable bends through an adjustment mechanism, the adjustable bend device can transfer instruments between some complex blood vessels. Attached Figure Description

[0031] Figure 1 This is a partial structural diagram of one embodiment of the adjustable bending device, mainly showing a portion of the structure of the pipe assembly in the adjustable bending device; Figure 2 , Figure 3 and Figure 4 Schematic diagrams of the adjustable bending device in the three embodiments; Figure 5 and Figure 6 These are partial structural schematic diagrams of the adjustable bending device in the two embodiments; Figure 7A This is a schematic diagram of the structure of the tube body of the adjustable bending device in one embodiment; Figure 7B This is a schematic diagram of the internal components of the adjustable bending device in one embodiment; Figure 7C This is a schematic diagram of the assembly of the first support member and the first tube body in one embodiment; Figure 8 This is a schematic diagram of the pipe assembly in one embodiment; Figure 9 for Figure 8 Sectional view at point AA; Figure 10A This is a partial structural schematic diagram of the bending mechanism in one embodiment; Figure 10B for Figure 10A The diagram shows the structure of the bending mechanism after bending. Figure 11 This is a schematic diagram of the cross-section of the isolation membrane in one embodiment; Figure 12 A schematic diagram showing the installation relationship between the adjusting wire and the separator membrane; Figure 13 This is a schematic diagram of the process by which a medical system enters the left common carotid artery via the left subclavian artery in one embodiment. Figure 14 This is a schematic diagram of the process by which a medical system enters the right common carotid artery via the brachiocephalic artery in one embodiment. Figure 15 This is a schematic diagram of the process by which a medical system enters the left common carotid artery via the femoral artery in one embodiment. Figure 16 This is a schematic diagram of the process by which a medical system enters the renal artery via the femoral artery in one embodiment.

[0032] Reference numerals: 100, tube assembly; 110, first adjustable bend; 111, first tube body; 112, first support; 113, hollow structure; 120, second adjustable bend; 121, second tube body; 122, second support; 1221, distal support; 1222, proximal support; 123, first side; 124, second side; 200, bending mechanism; 210, adjusting wire assembly; 211, first adjusting wire; 212, second adjusting wire; 300, isolation membrane; 310, isolation cavity; 320, inner cavity; 400, connector; 510, left common carotid artery; 520, left subclavian artery; 530, right common carotid artery; 540, brachiocephalic artery; 550, aortic arch; 560, thoracic aorta; 570, renal artery; 580, abdominal aorta; 590, femoral artery. Detailed Implementation

[0033] To facilitate understanding of this utility model, a more complete description of it is provided below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0034] It should be noted that when an element is said to be "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0035] As used in this document, "distal end" refers to the end of a component that is furthest from the operator along its length when the component is being operated on, while "proximal end" refers to the end of the component that is closest to the operator along its length. When a component is not being operated on, "distal end" and "proximal end" can be understood as distinguishing different parts of the component. In other words, "distal end" and "proximal end" are used solely for illustrative purposes to facilitate the reader's understanding of the description of a component and do not constitute a limitation on the component's structure.

[0036] Figure 1This is a partial structural diagram of one embodiment of the adjustable bending device, mainly showing a portion of the structure of the tube assembly 100 in the adjustable bending device. The adjustable bending device includes the tube assembly 100, which is an elongated tube with a lumen capable of accommodating a medical device. The medical device can move within the lumen and can enter or exit the lumen from an opening at the distal end of the lumen. Figure 1 The direction facing to the left is the distal end direction of the tube assembly 100, and the direction facing to the right is the proximal end direction of the tube assembly 100.

[0037] The pipe assembly 100 includes a first adjustable bend 110 and a second adjustable bend 120. The first adjustable bend 110 has a distal end a1 in the distal direction and a proximal end b1 in the proximal direction. The second adjustable bend 120 also has a distal end a2 in the distal direction and a proximal end b2 in the proximal direction. The proximal end b1 of the first adjustable bend 110 is connected to the distal end a2 of the second adjustable bend 120.

[0038] In other embodiments, other pipe structures may also be connected between the first adjustable bend 110 and the second adjustable bend 120.

[0039] The adjustable bending device includes a bending mechanism 200, which will be described in the embodiments below. The bending mechanism 200 connects to the pipe assembly 100 and is used to adjust the bending degree of the first adjustable bending section 110 and the second adjustable bending section 120. The bending mechanism 200 can independently control the bending degree of the first adjustable bending section 110 and the second adjustable bending section 120. For example, the bending degree of the second adjustable bending section 120 can be independently controlled while keeping the bending degree of the first adjustable bending section 110 constant; conversely, the bending degree of the first adjustable bending section 110 can be independently controlled while keeping the bending degree of the second adjustable bending section 120 constant. Of course, in actual use, a certain degree of interference with the second adjustable bending section 120 is permissible during the independent bending of the first adjustable bending section 110, but this interference can be reduced in a certain way. Similarly, in actual use, during the independent bending process of the second adjustable bending section 120, a certain degree of interference with the first adjustable bending section 110 is permissible, but the interference with the first adjustable bending section 110 can be reduced in a certain way.

[0040] Figure 2 , Figure 3 and Figure 4 These are schematic diagrams of the adjustable bending devices in the three embodiments. Their initial forms are not limited here; that is, their initial forms can be... Figure 1 The shape shown can also be other shapes. For example, Figure 1 , Figure 2 , Figure 3 or Figure 4Either one can be the initial form of the adjustable bending device.

[0041] like Figure 2 As shown, while keeping the curvature of the first adjustable bending section 110 constant, the curvature of the second adjustable bending section 120 is independently adjusted, so that the second adjustable bending section 120 changes from... Figure 1 The straight line state shown is adjusted to Figure 2 The bending state shown.

[0042] In one embodiment, while keeping the curvature of the second adjustable bending section 120 constant, the curvature of the first adjustable bending section 110 is independently adjusted, and the curvature of the second adjustable bending section 120 is further independently adjusted via the bending adjustment mechanism 200, thereby enabling the adjustable bending device to exhibit… Figure 3 The state shown.

[0043] In one embodiment, the adjustable bending device is Figure 2 In the state shown, the bending degree of the first adjustable bending section 110 can be independently adjusted by the bending mechanism 200, thereby allowing the adjustable bending device to present... Figure 3 The state shown.

[0044] In some embodiments, the adjustable bending direction of the first adjustable bending segment 110 and the adjustable bending direction of the second adjustable bending segment 120 can be the same or opposite. The same or opposite adjustable bending directions only limit the bending direction of the adjustable bending segment, but not the degree of bending. Of course, in other embodiments, the adjustable bending direction of the first adjustable bending segment 110 and the adjustable bending direction of the second adjustable bending segment 120 can be neither the same nor opposite, but rather form a certain angle, for example, an acute angle.

[0045] The ability to bend in the same or opposite directions refers to the initial configuration of the adjustable bending device.

[0046] For example, in one embodiment, the adjustable bending directions of the first adjustable bending segment 110 and the second adjustable bending segment 120 are the same. Specifically, Figure 1 In the initial configuration of the adjustable bending device, both the first adjustable bending section 110 and the second adjustable bending section 120 are straight. Figure 4 The adjustable bending device has been adjusted to create the desired shape; both the first adjustable bending section 110 and the second adjustable bending section 120 are bent. (See reference...) Figure 1 and Figure 4 Regarding the second adjustable bend section 120, it is made of Figure 1 The straight state shown is adjusted downwards to achieve the desired curve. Figure 4 The shape shown. For the first adjustable bend 110, it is formed by... Figure 1 The initial shape shown is bent downwards to achieve Figure 4 The shape shown. And because... Figure 4 The second adjustable bend 120 and the first adjustable bend 110 shown are both relative to Figure 1 The initial shape shown is adjusted downwards, at which point the adjustable bending directions of the first adjustable bending segment 110 and the second adjustable bending segment 120 are the same.

[0047] For example, in one embodiment, the adjustable bending directions of the first adjustable bending segment 110 and the second adjustable bending segment 120 are opposite. Specifically, Figure 1 In the initial form of the adjustable bends, both the first adjustable bend 110 and the second adjustable bend 120 are straight. Figure 3 The adjustable bending device has been adjusted to create the desired shape; both the first adjustable bending section 110 and the second adjustable bending section 120 are bent. (See reference...) Figure 1 and Figure 3 Regarding the second adjustable bend section 120, it is made of Figure 1 The straight state shown is adjusted downwards to achieve the desired curve. Figure 3 The shape shown. For the first adjustable bend 110, it is formed by... Figure 1 The initial shape shown is bent upwards to achieve... Figure 3 The shape shown. And because... Figure 3 The second adjustable bend 120 shown is relative to Figure 1 The initial shape shown bends downwards, while Figure 3 The first adjustable bend 110 shown is relative to Figure 1 The initial shape shown is bent upwards, so the adjustable bending directions of the first adjustable bending segment 110 and the second adjustable bending segment 120 are opposite.

[0048] Furthermore, in Figure 4 In the first adjustable bending segment 110 and the second adjustable bending segment 120, the adjustable bending direction is the same, and the bending direction of both the first adjustable bending segment 110 and the second adjustable bending segment 120 is downward. Figure 4 In this embodiment, the degree of curvature of the first adjustable bending segment 110 and the second adjustable bending segment 120 is not the same. Of course, in other embodiments, the degree of curvature of the first adjustable bending segment 110 and the second adjustable bending segment 120 can also be the same.

[0049] For example, in Figure 3 In this embodiment, the first adjustable bending segment 110 and the second adjustable bending segment 120 have opposite adjustable bending directions; the second adjustable bending segment 120 bends downwards, and the first adjustable bending segment 110 bends upwards. Furthermore, the degrees of bending of the first adjustable bending segment 110 and the second adjustable bending segment 120 are also different. In other embodiments, the degrees of bending of the first adjustable bending segment 110 and the second adjustable bending segment 120 may be the same. Alternatively, in other embodiments, the second adjustable bending segment 120 may bend upwards, and the first adjustable bending segment 110 may bend downwards.

[0050] In some embodiments, the first adjustable bending section 110 is a unidirectional adjustable bending section; or the first adjustable bending section 110 is a multidirectional adjustable bending section; or the second adjustable bending section 120 is a unidirectional adjustable bending section; or the second adjustable bending section 120 is a multidirectional adjustable bending section.

[0051] The first adjustable bending section 110 and the second adjustable bending section 120, which are unidirectionally adjustable, are relative to the initial shape of the adjustable bending device. For example, they can only be bent in a single direction from the initial shape. Since the shape after bending is not the initial shape, the process of reversing the bending to restore the initial shape is still called unidirectional bending.

[0052] In one embodiment, a unidirectional adjustable bend can be understood as a bending process performed with the centerline of the corresponding adjustable bend segment after it has been straightened as a reference. For example, the adjustable bend range of the first adjustable bend segment 110 is to one side of the centerline of the first adjustable bend segment 110 after it has been straightened, and cannot cross the centerline of the first adjustable bend segment 110 after it has been straightened. Similarly, the adjustable bend range of the second adjustable bend segment 120 is to one side of the centerline of the second adjustable bend segment 120 after it has been straightened, and cannot cross the centerline of the second adjustable bend segment 120 after it has been straightened.

[0053] Where C0 is Figure 1 The centerline of the adjustable bending device shown, C1 is Figure 2 The centerline of the adjustable bending device shown, C3 is Figure 3 The centerline of the adjustable bending device shown, C4 is Figure 4 The centerline of the adjustable bending device shown; C5 is Figure 5 The centerline of the adjustable bending device shown.

[0054] In one embodiment, the first adjustable bend 110 is a unidirectional adjustable bend. For example... Figure 2 As shown, the centerline of the first adjustable bending section 110 after straightening is... Figure 2 The centerline C1 of the first adjustable bending segment 110 is within the adjustable bending range of the first adjustable bending segment 110. Figure 2 Adjust the curve upwards from the solid line shown. Figure 2 The bending state shown by the dashed line, assuming that the state shown by the dashed line represents the state when the first adjustable bending segment 110 reaches its maximum adjustable bending degree, then the adjustable bending range T1 of the first adjustable bending segment 110 is... Figure 2 The adjustable bending range T1 does not cross the centerline C1 above the straightened centerline of the first adjustable bending segment 110 shown. Figure 2 The centerline C1 of the first adjustable bending segment 110 in the straightened state is shown. That is to say, with the centerline C1 of the first adjustable bending segment 110 in the straightened state as the initial position, the first adjustable bending segment 110, as a unidirectional adjustable bending segment, can only be bent in one direction.

[0055] In one embodiment, the second adjustable bend 120 is a unidirectional adjustable bend. See also Figure 1 and Figure 2 The centerline of the second adjustable bend section 120 after straightening is Figure 1 The centerline C0 of the second adjustable bending segment 120 is within the range of the second adjustable bending segment 120. Figure 1 Adjust downwards based on the shown figure. Figure 2 The bending state shown is assumed to be Figure 2 The state shown is when the second adjustable bending section 120 reaches its maximum adjustable bending degree. Therefore, the adjustable bending range of the second adjustable bending section 120 is... Figure 1 The adjustable bend range shown is below the centerline C0 after the second adjustable bend segment 120 is straightened, and this adjustable bend range does not cross... Figure 1 The centerline C0 of the second adjustable bending segment 120 in its straightened state is shown. Taking the centerline C0 of the second adjustable bending segment 120 after straightening as the initial position, the second adjustable bending segment 120, as a unidirectional adjustable bending segment, can only be bent in one direction.

[0056] Figure 5 and Figure 6 These are partial structural schematic diagrams of the adjustable bending device in the two embodiments.

[0057] The first adjustable bending segment 110 and the second adjustable bending segment 120, which are capable of multi-directional bending, are also relative to the initial shape of the adjustable bending device. For example, the initial shape can be bent along a first direction, or it can be bent along a second direction different from the first direction. Since the shape after bending is not the initial shape, the process of reversing back to the initial shape after bending is not considered as the direction of adjustable bending.

[0058] In one embodiment, multi-directional adjustable bending can be understood as a bending process performed with the centerline of the corresponding adjustable bending segment after it has been straightened as a reference. For example, the adjustable bending range of the first adjustable bending segment 110 is on both sides of the centerline of the first adjustable bending segment 110 after it has been straightened, and this adjustable bending range crosses the centerline of the first adjustable bending segment 110 after it has been straightened. As another example, the adjustable bending range of the second adjustable bending segment 120 is on both sides of the centerline of the second adjustable bending segment 120 after it has been straightened, and this adjustable bending range crosses the centerline of the second adjustable bending segment 120 after it has been straightened.

[0059] In one embodiment, the first adjustable bend 110 is a multi-directional adjustable bend. For example... Figure 5 As shown, the centerline of the first adjustable bending section 110 after straightening is... Figure 5The centerline C5 of the first adjustable bending segment 110A is given. Assuming the position of the first adjustable bending segment 110C is when the first adjustable bending segment 110A bends upwards to its maximum adjustable bending degree, and the position of the first adjustable bending segment 110B is when the first adjustable bending segment 110A bends downwards to its maximum adjustable bending degree, then the adjustable bending range T2 of the first adjustable bending segment 110 is between the positions of the first adjustable bending segment 110C and the first adjustable bending segment 110B. This adjustable bending range T2 crosses the centerline C5 of the first adjustable bending segment 110A in its straightened state. Taking the centerline C5 of the first adjustable bending segment 110 after straightening as the initial position, the first adjustable bending segment 110, as a multi-directional adjustable bending segment, can be bent in at least two directions.

[0060] In one embodiment, the second adjustable bend 120 is a multi-directional adjustable bend. For example... Figure 6 As shown, the centerline of the second adjustable bending section 120 after straightening is... Figure 6 The centerline C6 of the second adjustable bending segment 120A is taken as an example. Assume the position of the second adjustable bending segment 120C is when the second adjustable bending segment 120A is bent upwards to its maximum adjustable bending degree, and the position of the second adjustable bending segment 120B is when the second adjustable bending segment 120A is bent downwards to its maximum adjustable bending degree. Therefore, the adjustable bending range of the second adjustable bending segment 120 is between the positions of the second adjustable bending segment 120C and the second adjustable bending segment 120B. This adjustable bending range crosses the centerline of the second adjustable bending segment 120A in its straightened state. Taking the centerline C6 of the second adjustable bending segment 120 after straightening as the initial position, the second adjustable bending segment 120, as a multi-directional adjustable bending segment, can be bent in at least two directions.

[0061] In one embodiment, the ring stiffness of the first adjustable bend 110 and the ring stiffness of the second adjustable bend 120 are close. When determining the ring stiffness of the adjustable bend, it is not only necessary to determine the ring stiffness of the pipe material that makes up the adjustable bend, but also, if the adjustable bend includes some reinforcing members, to determine the ring stiffness of the combined pipe material and reinforcing members.

[0062] Specifically, the ring stiffness of the first adjustable bending section 110 is N times the ring stiffness of the second adjustable bending section 120, where 0 < N < 2. When 0 < N < 1, the ring stiffness of the first adjustable bending section 110 is less than that of the second adjustable bending section 120; when N = 1, the ring stiffness of the first adjustable bending section 110 is equal to that of the second adjustable bending section 120; and when 1 < N < 2, the ring stiffness of the first adjustable bending section 110 is greater than that of the second adjustable bending section 120. The ring stiffness of the first adjustable bending section 110 and the second adjustable bending section 120 refers to their ability to resist deformation when radial compressive forces are applied to them respectively. A greater ring stiffness indicates a greater resistance to deformation.

[0063] Ring stiffness can also be expressed as the overall stiffness of the adjustable bend. In one embodiment, the stiffness of the first adjustable bend 110 is greater than that of the second adjustable bend 120. For example, when the same force is applied to press the first adjustable bend 110 and the second adjustable bend 120, the second adjustable bend 120 will deform more than the first adjustable bend 110, for example, it will be easier to flatten. This can also be understood as the force applied to the first adjustable bend 110 needing to be greater than the force applied to the second adjustable bend 120 when the first adjustable bend 110 and the second adjustable bend 120 produce the same deformation. Because the stiffness of the first adjustable bend 110 is greater than that of the second adjustable bend 120, the first adjustable bend 110 has better stiffness and better support stability when supported on the inner wall of a blood vessel compared to the second adjustable bend 120.

[0064] In one embodiment, a medical device is delivered to a target location within a blood vessel via an adjustable bending device. The first adjustable bending segment 110 is in a bent state. As the medical device extends from the distal opening of the first adjustable bending segment 110, its greater rigidity allows it to better maintain the shape of the lumen. For example, the lumen can be maintained as a near-circular cavity, allowing the medical device to pass through the first adjustable bending segment 110 more smoothly. In some embodiments, the axial length of the second adjustable bending segment 120 is greater than that of the first adjustable bending segment 110. Because the rigidity of the first adjustable bending segment 110 is greater than that of the second adjustable bending segment 120, and the axial length of the second adjustable bending segment 120 is greater than that of the first adjustable bending segment 110, the second adjustable bending segment 120 is more flexible than the first adjustable bending segment 110 and can better conform to the shape of the curved blood vessel. Overall, when guiding the entire tubular assembly 100 forward within the blood vessel, the first adjustable bend 110 at the distal end is relatively stiff, which allows for better control of the direction of the tubular assembly 100 forward; while the second adjustable bend 120 at the proximal end is relatively soft, which allows for better adaptation to the curved blood vessel, making the tubular assembly 100 forward within the blood vessel more coordinated and smooth.

[0065] In some embodiments, there is no necessary relationship between the ring stiffness and the adjustable bending capacity of the first adjustable bending segment 110 and the second adjustable bending segment 120. That is, when the ring stiffness of the first adjustable bending segment 110 is greater than that of the second adjustable bending segment 120, the adjustable bending capacity of the first adjustable bending segment 110 may be greater than, equal to, or less than that of the second adjustable bending segment 120. Alternatively, when the ring stiffness of the second adjustable bending segment 120 is greater than that of the first adjustable bending segment 110, the adjustable bending capacity of the second adjustable bending segment 120 may be greater than, equal to, or less than that of the first adjustable bending segment 110.

[0066] In some embodiments, the adjustability of the adjustable bend may be related to the length of the adjustable bend.

[0067] In one embodiment, the first adjustable bend 110 and the second adjustable bend 120 are compared at the same length, i.e., at the same length axially. The first adjustable bend 110 has greater adjustability than the second adjustable bend 120. Since the first adjustable bend 110 is located at the distal end of the second adjustable bend 120, it acts as a guide when moving within the blood vessel, thus improving its adjustability and allowing it to be manipulated flexibly.

[0068] For the adjustable bending performance of the first adjustable bending section 110, please refer to... Figure 7C This can be achieved by adjusting the structure and number of the hollow structure 113 on the first support member 112 of the first adjustable bending section 110, which will be described in detail below. The hollow structure 113 can be an elongated hole, and there are multiple of them, arranged along the axial direction. As the number of hollow structures 113 increases, the density of the distribution of the hollow structures 113 increases, and the corresponding adjustable bending performance of the first adjustable bending section 110 is better. That is to say, when the material of the adjustable bending section is determined, its ring stiffness is often fixed, but its adjustable bending performance can be adjusted by changing the parameters of the hollow structure 113.

[0069] Figure 7A This is a schematic diagram of the tube body of the adjustable bending device in one embodiment. Figure 7B This is a schematic diagram of the internal components of the adjustable bending device in one embodiment. Figure 7C This is a schematic diagram of the assembly of the first support member 112 and the first tube body 111 in one embodiment.

[0070] like Figure 7A As shown, the tubing assembly 100 of the adjustable bending device includes a tubing body, which is an elongated tube with an opening at its distal end communicating with a lumen. The tubing body can be made of one or more materials. The material of the tubing body can be selected from, or include combinations of, materials such as: biocompatible materials, polytetrafluoroethylene (PTFE), polymers with different hardness, stainless steel, nickel-titanium alloy, PEBAX, and / or polyamide. Softer and harder materials can be combined to allow the tubing body to support medical devices such as stents it houses, and to allow the tubing body to bend. The tubing body includes a first tubing body 111 located at its distal end and a second tubing body 121 connected to the first tubing body 111, the distal end of the second tubing body 121 being connected to the proximal end of the first tubing body 111. The first tubing body 111 belongs to a first adjustable bending segment 110, and the second tubing body 121 belongs to a second adjustable bending segment 120.

[0071] like Figure 7A , Figure 7B and Figure 7C As shown, in one embodiment, the first adjustable bend 110 includes a first tube 111 and a first support member 112. The first support member 112 is embedded within the first tube 111 and serves as a reinforcing member to enhance the ring stiffness of the first adjustable bend 110. For example, the first support member 112 can be completely embedded within the wall of the first tube 111, and the first support member 112 is completely covered by the tube wall. Alternatively, the first support member 112 can be partially embedded within the wall of the first tube 111, and the first support member 112 is at least partially exposed from within the tube wall.

[0072] In one embodiment, the ring stiffness of the first support member 112 is greater than that of the first tube body 111, thus the first support member 112 provides support and reinforcement to the first tube body 111, helping to maintain the shape of the first tube body 111 from being flattened and helping to protect the medical device contained within the first tube body 111. The ring stiffness of the first support member 112 and the first tube body 111 can be understood as the ease of deformation under pressure. For example, when pressing the first support member 112 and the first tube body 111 with the same force, the first tube body 111 is more likely to deform under pressure. In one embodiment, the first support member 112 is metal, and the first tube body 111 is non-metallic. In one embodiment, the first support member 112 is a sodium hypochlorite tube.

[0073] like Figure 7A and Figure 7B As shown, in one embodiment, the second adjustable bend 120 includes a second tube 121 and a second support member 122, with the second support member 122 embedded within the second tube 121. The second support member 122 serves as a reinforcing member to enhance the ring stiffness of the second adjustable bend 120. For example, the second support member 122 can be completely embedded within the wall of the second tube 121, with the second support member 122 being completely covered by the tube wall. Alternatively, the second support member 122 can be partially embedded within the wall of the second tube 121, with the second support member 122 at least partially exposed from within the tube wall.

[0074] In some embodiments, the ring stiffness of the second support member 122 may be greater than, less than, or equal to the ring stiffness of the second tube 121. For example, the ring stiffness of the second support member 122 may be equal to or slightly greater than the ring stiffness of the second tube 121, thereby providing a certain degree of support and reinforcement to the second tube 121. The ring stiffness of the second support member 122 and the second tube 121 can be understood as the ease of deformation under pressure. For example, when pressing the second support member 122 and the second tube 121 with the same force, the second tube 121 is more likely to deform under pressure, or the deformation degrees of the second support member 122 and the second tube 121 may be similar.

[0075] In one embodiment, the second support member 122 is metal, and the second tube body 121 is non-metallic. In one embodiment, the second support member 122 can be a woven mesh formed by a braiding process, or a mesh formed by cutting. In one embodiment, the second support member 122 can also be a sodium hydroxide tube. In some embodiments, the ring stiffness of the first support member 112 can be greater than the ring stiffness of the second support member 122; or the ring stiffness of the first support member 112 can be equal to the ring stiffness of the second support member 122; or the ring stiffness of the first support member 112 can be less than the ring stiffness of the second support member 122. Figure 7B As shown, the second support member 122 includes a distal support member 1221 and a proximal support member 1222 connected to the proximal end of the distal support member 1221.

[0076] In one embodiment, the distal support 1221 is a hysteresis tube, and the proximal support 1222 is a mesh structure.

[0077] In one embodiment, such as Figure 7B As shown, both the distal support 1221 and the proximal support 1222 adopt a mesh structure, with the mesh density of the distal support 1221 being greater than that of the proximal support 1222. When the distal support 1221 and the proximal support 1222 are fused with the second tube 121, the structure formed by the fusion of the distal support 1221 (with its higher mesh density) and the second tube 121 is generally softer, while the structure formed by the fusion of the proximal support 1222 (with its lower mesh density) and the second tube 121 is generally harder.

[0078] In one embodiment, both the distal support 1221 and the proximal support 1222 employ a mesh structure, with the unit mesh area of ​​the distal support 1221 being smaller than that of the proximal support 1222. When the distal support 1221 and proximal support 1222 are fused with the second tube 121, the structure formed by the fusion of the distal support 1221 (with its smaller unit mesh area) and the second tube 121 is generally softer, while the structure formed by the fusion of the proximal support 1222 (with its larger unit mesh area) and the second tube 121 is generally harder. The unit mesh area is defined as the area of ​​the mesh in its natural state, meaning the state of the mesh when not subjected to external pressure or tension. If all meshes on the corresponding supports are the same size, the area of ​​any single mesh is used as the unit mesh area. If the meshes on the corresponding supports are different sizes, the area corresponding to the majority of identical meshes on the corresponding supports is used as the unit area for these meshes.

[0079] The second tube 121 can be made of materials with different hardness. The part where the second tube 121 is fused with the distal support 1221 is made of a softer material, so that the overall structure after the distal support 1221 and the second tube 121 are fused is relatively soft. The part where the second tube 121 is fused with the proximal support 1222 is made of a harder material, so that the overall structure after the proximal support 1222 and the second tube 121 are fused is relatively hard.

[0080] Since the second support member 122 can be a woven mesh formed by a weaving process or a mesh formed by cutting and processing, when the second support member 122 is a woven mesh formed by a weaving process, the mesh density of the support member 1221 can be represented by the weaving density.

[0081] In one embodiment, the axial length of the first adjustable bend 110 is greater than the axial length of the second adjustable bend 120. The axial lengths of the first adjustable bend 110 and the second adjustable bend 120 can be determined by: individually controlling the bending of the first adjustable bend 110, observing and measuring the axial length of the portion of the pipe assembly 100 that undergoes bending deformation during this process, i.e., the axial length of the first adjustable bend 110; individually controlling the bending of the second adjustable bend 120, observing and measuring the axial length of the portion of the pipe assembly 100 that undergoes bending deformation during this process, i.e., the axial length of the second adjustable bend 120. Alternatively, the axial lengths of the first adjustable bend 110 and the second adjustable bend 120 can be determined by: measuring the axial length of the first support member 112, and using the axial length of the first support member 112 to represent the axial length of the first adjustable bend 110; measuring the axial length of the second support member 122, and using the axial length of the second support member 122 to represent the axial length of the second adjustable bend 120.

[0082] In one embodiment, the axial length of the first adjustable bend 110 is equal to the axial length of the second adjustable bend 120. In another embodiment, the axial length of the first adjustable bend 110 may also be less than the axial length of the second adjustable bend 120.

[0083] Figure 8 This is a schematic diagram of the structure of the pipe assembly 100 in one embodiment. Figure 9 for Figure 8The cross-sectional view at point AA is the cross-sectional view of the second adjustable bending segment 120. The second adjustable bending segment 120 includes a first side portion 123 and a second side portion 124 made of materials with different hardness in the circumferential direction, forming a tubular structure. The hardness of the first side portion 123 is greater than that of the second side portion 124, mainly due to the materials used in them. Under the same conditions, when bending the first side portion 123 and the second side portion 124, the harder first side portion 123 is more difficult to bend, while the less hard second side portion 124 is easier to bend. By making the first side portion 123 harder, when the first adjustable bending segment 110 bends towards the first side portion 123, the first side portion 123 can better provide support, preventing the first adjustable bending segment 110 from affecting the shape of the second adjustable bending segment 120 during the bending process. During the bending process of the first adjustable bending segment 110, the second adjustable bending segment 120 can maintain its bending state as much as possible, and will not change due to the influence of the first adjustable bending segment 110.

[0084] In other embodiments, with Figure 8 The difference in the illustrated embodiment is that the second adjustable bending section 120 includes a distal section and a proximal section in the axial direction, and the distal section of the second adjustable bending section 120 adopts a similar design. Figure 8 and Figure 9 The structure shown, namely the distal section of the second adjustable bending segment 120, includes a first side portion 123 and a second side portion 124 made of materials with different hardnesses in the circumferential direction, with the hardness of the first side portion 123 being greater than that of the second side portion 124. The proximal section of the second adjustable bending segment 120 is made of the same material, or the proximal section of the second adjustable bending segment 120 is made of a material with the same hardness in the circumferential direction. The hardness of the material in the proximal section of the second adjustable bending segment 120 can be equal to or greater than the hardness of the material in the first side portion 123 of the distal section of the second adjustable bending segment 120. (Combined with...) Figure 7B The distal segment of the second adjustable bend 120 is fused with the distal support 1221, and the proximal segment of the second adjustable bend 120 is fused with the proximal support 1222. Defined in the circumferential direction, along one of the diameters, the first direction and the second direction are respectively on either side, with the second direction opposite to the first direction. For example, in... Figure 8 and Figure 9 In the middle, the upward direction is the first direction, and the downward direction is the second direction.

[0085] Preferred, such as Figure 8 As shown, the first adjustable bending section 110 is a one-way adjustable bending section, and the first adjustable bending section 110 can be adjusted to bend in a first direction (upward direction). Figure 8 and Figure 9As shown, the first side portion 123 of the second adjustable bending section 120 is located above the second side portion 124, that is, the first side portion 123 is disposed in a first direction of the second side portion 124. In other words, the second side portion 124 of the second adjustable bending section 120 is disposed in a second direction of the first side portion 123. Figure 8 As shown, when the first adjustable bending segment 110 bends upward, the upper first side portion 123 is compressed. By increasing the stiffness of the first side portion 123, greater support force is provided to maintain the shape of the second adjustable bending segment 120. Preferably, see [reference needed]. Figure 3 The second adjustable bending section 120 can be bent in a second direction (downward), thus allowing for better control of the shape of the second adjustable bending section 120 when the first adjustable bending section 110 is bent in the first direction (upward). See also... Figure 3 When the second adjustable bending section 120 is adjusted to bend in the second direction (downward direction), the upper part is called the large bending side of the second adjustable bending section 120, and the lower part is called the small bending side of the second adjustable bending section 120. The first side 123 is set on the large bending side, and the second side 124 is set on the small bending side.

[0086] like Figure 9 As shown, within the same cross-section of the first side portion 123 and the second side portion 124, the circumferential lengths of the first side portion 123 and the second side portion 124 are the same in the circumferential direction of the cross-section. In other embodiments, in order to better maintain the shape of the second adjustable bending segment 120 when the first adjustable bending segment 110 bends, the circumferential length of the first side portion 123 can be greater than the circumferential length of the second side portion 124 within the same cross-section.

[0087] Of course, in other embodiments, the first adjustable bending segment 110 may also include a first side portion 123 and a second side portion 124 arranged circumferentially on the first adjustable bending segment 110, wherein the hardness of the first side portion 123 is greater than the hardness of the second side portion 124. Alternatively, the first adjustable bending segment 110 and the second adjustable bending segment 120 may each include two sub-segments of different hardness arranged circumferentially on their respective sides. That is, the first adjustable bending segment 110 includes a first side portion 123 and a second side portion 124 arranged circumferentially on the first adjustable bending segment 110, wherein the hardness of the first side portion 123 is greater than the hardness of the second side portion 124; and the second adjustable bending segment 120 includes a first side portion 123 and a second side portion 124 arranged circumferentially on the second adjustable bending segment 120, wherein the hardness of the first side portion 123 is greater than the hardness of the second side portion 124.

[0088] Figure 10A This is a partial structural schematic diagram of the bending mechanism 200 in one embodiment. Figure 10B for Figure 10AThe diagram shows the structure of the bending mechanism 200 after bending. In one embodiment, the bending mechanism 200 realizes the bending function of the first adjustable bending section 110 and the second adjustable bending section 120. The bending mechanism 200 includes an adjusting wire assembly 210. The distal end of the adjusting wire assembly 210 is fixedly connected to the tube assembly 100. Except for the portion of the adjusting wire assembly 210 that is fixedly connected to the tube assembly 100 at its distal end, the remaining portion of the adjusting wire assembly 210 can slide relative to the tube assembly 100. By pulling the proximal end of the adjusting wire assembly 210, the adjusting wire assembly 210 slides proximally relative to the tube assembly 100. Since the distal end of the adjusting wire assembly 210 is fixedly connected to the tube assembly 100, the distal end of the tube assembly 100 can be pulled towards the proximal end relative to the proximal end of the tube assembly 100, thereby bending the distal end of the tube assembly 100. By adjusting the degree of relative movement of the proximal end of the adjusting wire assembly 210 relative to the proximal end of the tube assembly 100, the degree of bending of the distal end of the tube assembly 100 can be adjusted.

[0089] See Figure 10A and Figure 10B The bending mechanism 200 includes an adjusting wire assembly 210, which is disposed within the side wall of the tube assembly 100. A cavity extending along the length direction can be provided within the side wall of the tube assembly 100. The adjusting wire assembly 210 is slidably disposed within the cavity of the side wall, and its distal end is fixedly connected to the tube assembly 100. In one embodiment, an annular connector 400 can be provided at the distal end of the tube assembly 100. The annular connector 400 can be a metal component, which is fixedly embedded within the tube wall of the tube assembly 100. The distal end of the adjusting wire assembly 210 is fixedly connected to the connector 400. In other words, the distal end of the adjusting wire assembly 210 is fixedly connected to the tube assembly 100 through the connector 400, thus increasing the connection strength between the adjusting wire assembly 210 and the tube assembly 100.

[0090] In one embodiment, the adjusting wire assembly 210 includes a first adjusting wire 211 and a second adjusting wire 212. The first adjusting wire 211 is connected to the distal portion of the first adjustable bend 110, and the second adjusting wire 212 is connected to the distal portion of the second adjustable bend 120. The first adjusting wire 211 controls the degree of bending of the first adjustable bend 110 by sliding along the length direction of the tube assembly 100; the second adjusting wire assembly 212 controls the degree of bending of the second adjustable bend 120 by sliding along the length direction of the tube assembly 100. Specifically, the sliding of the first adjusting wire 211 along the length direction of the tube assembly 100 means that, except for the portion of the first adjusting wire 211 fixedly connected to the tube assembly 100, it is non-slidable, while the other portions slide relative to the tube assembly 100. Similarly, the sliding of the second adjusting wire 212 along the length direction of the tube assembly 100 means that, except for the portion of the second adjusting wire 212 fixedly connected to the tube assembly 100, it is non-slidable, while the other portions slide relative to the tube assembly 100.

[0091] See Figure 7B The adjustable bending device includes a first connector 400A and a second connector 400B. The distal end of the first adjusting wire 211 is fixedly connected to the first connector 400A, and the distal end of the second adjusting wire 212 is fixedly connected to the second connector 400B. The first connector 400A is fixedly connected to the distal end of the first adjustable bending section 110, and the second connector 400B is fixedly connected to the distal end of the second adjustable bending section 120.

[0092] The adjustment process of the adjustable bend is mainly achieved by the sliding of the adjusting wire assembly 210 relative to the tube body of the adjustable bend. In order to make the sliding of the adjusting wire assembly 210 relative to the tube body smoother, the adjustable bend device may also include an isolation membrane 300 attached to the inner surface of the tube cavity of the tube assembly 100. Figure 11 The diagram shows a cross-sectional view of the isolation membrane 300 in one embodiment. The isolation membrane 300 has an inner cavity 320 located within the lumen of the tube assembly 100, and an isolation cavity 310 located within the tube wall of the tube assembly 100. Figure 12 The diagram illustrates the installation relationship between the adjusting wires and the separator 300. The first adjusting wire 211 is slidably disposed within one of the separator cavities 310, and the second adjusting wire 212 is slidably disposed within the other separator cavity 310. The separator 300 can be made of a material with low friction, including but not limited to polytetrafluoroethylene (PTFE).

[0093] In other embodiments, the isolation cavity 310 may also be at least partially embedded in the tube wall of the tube assembly 100, or the isolation cavity 310 may be located within the lumen of the tube assembly 100.

[0094] One embodiment of this disclosure provides a medical system including an adjustable bending device and a medical device disposed within the lumen of the adjustable bending device. The adjustable bending device is inserted into a blood vessel and travels along the blood vessel to a target location within the blood vessel. The medical device is then pushed distally relative to the adjustable bending device, allowing the medical device to enter the blood vessel from an opening at the distal end of the adjustable bending device.

[0095] The medical device includes at least one of a filter, a stent, a vascular plug, a guidewire, and a catheter.

[0096] One embodiment of this disclosure provides a medical system in which the medical device may include a brain protection device. The protection device may be a funnel-shaped mesh structure. By placing the brain protection device within a blood vessel, it intercepts blood clots flowing into the brain, thus preventing blood clots from entering the cerebral blood vessels. For example, the brain protection device has a mesh structure and a compressible shape located within the lumen of a tubular assembly 100. In this case, at least the radial dimension of the tubular assembly 100 can be compressed to a smaller size, facilitating passage through the blood vessel. The brain protection device has a certain degree of self-expansion. When the brain protection device is discharged from the lumen of the tubular assembly 100, it can self-expand to adhere to the inner wall of the blood vessel, thereby intercepting blood clots within the blood vessel. In other words, the brain protection device has an expanded shape after extending from the distal opening of the lumen.

[0097] For example, a brain protection device can be placed inside the left common carotid artery 510. Figure 13 This is a schematic diagram illustrating the process of a medical system in one embodiment entering the left common carotid artery 510 via the left subclavian artery 520, where a brain protection device is delivered into the left common carotid artery 510 via an adjustable bending device. As the adjustable bending device passes through the left subclavian artery 520, it adapts to the curved shape of the left subclavian artery 520 by bending a second adjustable bending segment 120, and its distal end is aligned with or at least partially enters the left common carotid artery 510 by bending a first adjustable bending segment 110. Subsequently, the brain protection device within the adjustable bending device can be pushed distally, allowing it to enter the left common carotid artery 510.

[0098] Figure 14 This is a schematic diagram illustrating the process of a medical system entering the right common carotid artery 530 via the brachiocephalic artery 540 in one embodiment; a brain protection device is delivered into the right common carotid artery 530 via an adjustable bending device. As the adjustable bending device passes through the brachiocephalic artery 540, it adapts to the curved shape of the artery through the bending of a second adjustable bending segment 120, and the first adjustable bending segment 110 is bent to align its distal end with or at least partially enter the right common carotid artery 530. Subsequently, the brain protection device within the adjustable bending device can be pushed distally, allowing it to enter the right common carotid artery 530.

[0099] Figure 15 This is a schematic diagram illustrating the process of a medical system entering the left common carotid artery 510 via the femoral artery 590 in one embodiment; a medical device is delivered into the left common carotid artery 510 via an adjustable bending device. The adjustable bending device enters the thoracic aorta 560 via the femoral artery 590, and then enters the left common carotid artery 510 via the aortic arch 550 from the thoracic aorta 560. The bending of the second adjustable bending segment 120 adapts to the complex vascular morphology at the thoracic aorta 560 and the aortic arch 550, and the bending of the first adjustable bending segment 110 aligns the distal end of the first adjustable bending segment 110 with the left common carotid artery 510 or at least partially enters the left common carotid artery 510, thus pushing the medical device within the adjustable bending device into the left common carotid artery 510. The first adjustable bend 110 has a higher stiffness than the second adjustable bend 120, which allows the second adjustable bend 120 to adapt to the curved blood vessel, while the first adjustable bend 110 can be supported on the inner wall of the aortic arch 550, so that the first adjustable bend 110 can be more stably maintained in the blood vessel.

[0100] Figure 16 This is a schematic diagram of a medical system in one embodiment entering a renal artery 570 via a femoral artery 590; a medical device is delivered into the renal artery 570 via an adjustable bending device. The adjustable bending device enters the abdominal aorta 580 via the femoral artery 590, and then enters the renal artery 570 from the abdominal aorta 580. By bending the first adjustable bending segment 110, the distal end of the first adjustable bending segment 110 is aligned with or at least partially enters the renal artery 570, and then the medical device is pushed into the renal artery 570.

[0101] like Figure 13 As shown, when the left subclavian artery 520 passes through the aortic arch 550 and enters the left common carotid artery 510, the first adjustable segment 110 is required to bend over a large range within a smaller space. The first adjustable segment 110 achieves a bending angle of nearly 180° within a smaller space. To better apply the adjustable bending device to brain protection devices, the length ratio of the first adjustable segment 110 to the second adjustable segment 120 is X, where 1 / 4 ≤ X ≤ 1. The first adjustable segment 110 can be shorter than the second adjustable segment 120. The first adjustable segment 110 can bend flexibly, while the second adjustable segment 120 can better adapt to the shape of the left subclavian artery 520.

[0102] Furthermore, in order to adapt to the application environment of the aortic arch 550 and its branch vessels, the sum of the axial lengths Y of the first adjustable bend segment 110 and the second adjustable bend segment 120 can be limited to 60mm≤Y≤200mm.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An adjustable bending device, characterized in that, include: The pipe assembly includes a first adjustable bend and a second adjustable bend connected to the proximal end of the first adjustable bend; and A bending mechanism is connected to the pipe assembly and used to adjust the degree of bending of the first adjustable bend and the second adjustable bend.

2. The adjustable bending device according to claim 1, characterized in that, The ring stiffness of the first adjustable bending segment is N times the ring stiffness of the second adjustable bending segment, where 0 < N < 2; and / or The first adjustable bending segment and the second adjustable bending segment are of the same length, and the first adjustable bending segment has greater adjustability than the second adjustable bending segment.

3. The adjustable bending device according to claim 1, characterized in that, The first adjustable bend includes a first tube and a first support embedded in the first tube, wherein the ring stiffness of the first support is greater than the ring stiffness of the first tube.

4. The adjustable bending device according to claim 3, characterized in that, The second adjustable bend includes a second tube body and a second support member embedded in the second tube body.

5. The adjustable bending device according to claim 4, characterized in that, The second support member includes a distal support member and a proximal support member connected to the proximal end of the distal support member. The distal support member is a hygroscopic tube or a mesh structure, and the proximal support member is a mesh structure.

6. The adjustable bending device according to claim 5, characterized in that, Both the distal support and the proximal support are mesh structures. The mesh density of the distal support is greater than that of the proximal support; or The unit mesh area of ​​the distal support is smaller than that of the proximal support.

7. The adjustable bending device according to claim 1, characterized in that, The adjustable bending directions of the first adjustable bending segment and the second adjustable bending segment are the same or opposite.

8. The adjustable bending device according to claim 1, characterized in that, The axial length of the first adjustable bend is greater than the axial length of the second adjustable bend; or the axial length of the first adjustable bend is equal to the axial length of the second adjustable bend.

9. The adjustable bending device according to claim 1, characterized in that, The bending mechanism includes an adjusting wire assembly that connects the first adjustable bend and the second adjustable bend respectively. The adjusting wire assembly is at least partially slidable along the length of the tube assembly to control the degree of bending of the first adjustable bend and the second adjustable bend.

10. The adjustable bending device according to claim 9, characterized in that, The adjusting wire assembly includes a first adjusting wire and a second adjusting wire. The first adjusting wire is connected to the portion of the first adjustable bend near its distal end, and the second adjusting wire is connected to the portion of the second adjustable bend near its distal end. The first adjusting wire controls the degree of bending of the first adjustable bend by sliding along the length direction of the tube assembly, and the second adjusting wire controls the degree of bending of the second adjustable bend by sliding along the length direction of the tube assembly.

11. The adjustable bending device according to claim 9, characterized in that, The adjustable bending device includes an isolation membrane attached to the inner surface of the tube lumen of the tube assembly, the isolation membrane having an isolation cavity, and at least a portion of the adjusting wire assembly being slidably inserted through the isolation cavity.

12. The adjustable bending device according to claim 1, characterized in that, The first adjustable bending section is a unidirectional adjustable bending section; or The first adjustable bending section is a multi-directional adjustable bending section; or The second adjustable bending section is a unidirectional adjustable bending section; or The second adjustable bending section is a multi-directional adjustable bending section.

13. The adjustable bending device according to claim 1, characterized in that, The first adjustable bending segment and / or the second adjustable bending segment respectively include a first side and a second side in the circumferential direction, and the hardness of the first side is greater than that of the second side.

14. The adjustable bending device according to claim 13, characterized in that, The two opposite sides along one of the diameter directions of the pipe assembly are respectively the first direction and the second direction, and the first adjustable bend is a unidirectional adjustable bend that can be adjusted along the first direction. The second adjustable bend includes a first side and a second side, wherein the first side of the second adjustable bend is disposed in the first direction of the second side.

15. The adjustable bending device according to claim 13 or 14, characterized in that, Within the same cross-section of the first side and the second side, the circumferential length of the first side is greater than the circumferential length of the second side; or the circumferential length of the first side is equal to the circumferential length of the second side.

16. The adjustable bending device according to claim 1, characterized in that, The ratio of the length of the first adjustable bend to the length of the second adjustable bend is X, where 1 / 4 ≤ X ≤ 1; and / or The sum of the axial lengths of the first adjustable bend and the second adjustable bend is Y, where 60mm ≤ Y ≤ 200mm.

17. An interventional medical system, characterized in that, The device includes the adjustable bending device according to any one of claims 1 to 16, and further includes a medical device for delivering the medical device into a blood vessel.

18. The interventional medical system according to claim 17, characterized in that, The medical device includes at least one of a filter, a stent, a vascular plug, a guidewire, and a catheter.

19. An interventional medical system, characterized in that, The adjustable bending device according to any one of claims 1 to 16 further includes a brain protection device having a compressed configuration located within the lumen of the tube assembly and an expanded configuration extending from the distal opening of the lumen.

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