Medical implant and system thereof

Abstract

The utility model provides a medical implant and a system thereof, the medical implant comprises an artificial blood vessel and an anchoring mechanism, the anchoring mechanism comprises two first support bodies, the two first support bodies are respectively connected with two axial ends of the artificial blood vessel, and the two first support bodies and the artificial blood vessel are coaxially arranged. The medical implant can be used for treating hemangioma, aortic dissection and other diseases, when the medical implant is used, the medical implant is used for being implanted into a lumen of a target blood vessel, anchoring is achieved in the blood vessel through the anchoring mechanism, the lesion position is covered through the artificial blood vessel, and therefore the medical implant can be used for treating the diseases such as the hemangioma and the aortic dissection. Or the artificial blood vessel is matched with other structural parts which are at least partially implanted into the diseased region, so that the purpose of treating the diseased region is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a medical implant and a system thereof. Background Art

[0002] There are two main treatments for intracranial aneurysms, one is open surgery, and the other is vascular interventional surgery. The operation process of open surgery is roughly as follows: use a traction device to open the channel between the brain and the skull. After the aneurysm can be visually visualized, the aneurysm clip is placed across the neck of the aneurysm and clamped closed. This method is highly invasive and risky. Vascular interventional surgery uses a catheter to deliver the embolic coil to the aneurysm cavity to replace the blood therein and promote embolization of the aneurysm cavity. The follow-up results one year after surgery showed that compared with open surgery, the risk of death or serious events in patients undergoing vascular interventional surgery was reduced by about 22.6%. Therefore, at present, vascular interventional surgery is the preferred treatment for aneurysms.

[0003] However, using embolic coils alone to fill the aneurysm cavity also has certain limitations. For example, when the aneurysm neck is wide, especially when the parent vessel is curved, the embolic coil may not be able to fully cover the aneurysm cavity after implantation, and may also fall out of the aneurysm cavity and fall into the surrounding blood vessels, causing thromboembolic accidents. Utility Model Content

[0004] The utility model aims to provide a medical implant and a system thereof, aiming to effectively treat diseases such as aneurysm and aortic dissection.

[0005] To achieve the above objectives, the utility model provides a medical implant, including an artificial blood vessel and an anchoring mechanism, wherein the anchoring mechanism includes two first stent bodies, which are respectively connected to the axial ends of the artificial blood vessel and are coaxially arranged with the artificial blood vessel.

[0006] Optionally, the anchoring mechanism further includes a friction-enhancing structural component, and the friction-enhancing structural component is provided on the outer peripheral surface of at least one of the first bracket bodies.

[0007] Optionally, the friction-increasing structural component includes a plurality of hairs, and the plurality of hairs are dispersedly arranged on the outer peripheral surface of the corresponding first bracket body.

[0008] Optionally, the friction-increasing structural component is made of a degradable material.

[0009] Optionally, the artificial blood vessel includes an artificial blood vessel body and a second stent body, the artificial blood vessel body includes a plurality of segments arranged at intervals along its axial direction, and two adjacent segments are connected by one second stent body.

[0010] Optionally, the medical implant further comprises embolic spring coils, each of which is used to be arranged on the outside of one of the second stent bodies.

[0011] Optionally, the medical implant further comprises an occluder, each of the occluders being used to be at least partially disposed on the outside of one of the second stent bodies and also connected to the corresponding second stent body.

[0012] Optionally, both the first stent body and the second stent body are self-expanding stent structures.

[0013] Optionally, the artificial blood vessel comprises an inner braided layer, a middle layer and an outer braided layer which are sequentially connected from inside to outside in a radial direction thereof.

[0014] To achieve the above object, the utility model further provides a medical implant system, comprising a pusher and the medical implant as described above, wherein the pusher is detachably connected to an end of any one of the first bracket bodies away from another one of the first bracket bodies.

[0015] Compared with the prior art, the medical implant and the system of the utility model have the following advantages: the aforementioned medical implant includes an artificial blood vessel and an anchoring mechanism, the anchoring mechanism includes two first stent bodies, the two first stent bodies are respectively connected to the axial ends of the artificial blood vessel, and are coaxially arranged with the artificial blood vessel. The medical implant can be used to treat diseases such as hemangioma and aortic dissection. When used, the medical implant is used to be implanted into the lumen of the target blood vessel, and the anchoring mechanism is used to achieve anchoring in the blood vessel, and the artificial blood vessel is also used to cover the lesion site, or the artificial blood vessel is made to cooperate with other structural parts at least partially implanted in the lesion site to achieve the purpose of treating the lesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation to the present invention.

[0017] Figure 1 It is a schematic structural diagram of a medical implant provided by the utility model according to the first embodiment.

[0018] Figure 2 It is a cross-sectional view of an artificial blood vessel of a medical implant provided by the utility model according to the first embodiment.

[0019] Figure 3 This is a schematic diagram of an application scenario of the medical implant provided by the first embodiment of the utility model, and the lesion in the diagram is a relatively small hemangioma.

[0020] Figure 4This is a schematic diagram of an application scenario of a medical implant provided by the utility model according to an embodiment, and the lesion in the diagram is aortic dissection.

[0021] Figure 5 It is a schematic structural diagram of a vascular implant of a medical implant provided by the utility model according to the second embodiment.

[0022] Figure 6 This is a schematic diagram of an application scenario of the medical implant provided by the second embodiment of the present invention. The lesion in the diagram is a hemangioma, and the neck of the hemangioma is relatively wide.

[0023] [The illustrations are marked as follows]: 100-medical implant, 110-artificial blood vessel, 111-inner braided layer, 112-middle layer, 113-outer braided layer, 114-artificial blood vessel body, 1141-segment, 115-second stent body, 120-anchoring mechanism, 121-first stent body, 122-villi, 130-embolization coil, 01-hemangioma, 02-aortic dissection, 03-tumor-bearing vessel, 04-aorta. DETAILED DESCRIPTION

[0024] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner, so the diagram only shows the components related to the present invention rather than drawing according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0025] In addition, each embodiment of the following description has one or more technical features, but this does not mean that the user of the present invention must implement all the technical features in any embodiment at the same time, or can only implement part or all of the technical features in different embodiments separately. In other words, under the premise of being possible to implement, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present invention and according to the design specifications or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0026] As used in this specification, the singular forms "one", "an" and "the" include plural objects, and the plural form "multiple" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise, and the terms "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. Relational terms such as the terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly indicate the number of technical features indicated. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0027] One of the purposes of the utility model is to provide a medical implant, which can be used to effectively treat diseases such as hemangioma and aortic dissection.

[0028] A second objective of the present utility model is to provide a medical implant system, wherein the medical implant system comprises the medical implant.

[0029] In order to make the purpose, advantages and features of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. The same or similar reference numerals in the drawings represent the same or similar components.

[0030] Figure 1 FIG. 1 is a schematic diagram showing the structure of a medical implant 100 provided in the first embodiment of the present invention. Figure 1 As shown, the medical implant 100 includes an artificial blood vessel 110 and an anchoring mechanism 120. The anchoring mechanism 120 includes two first stent bodies 121, which are respectively connected to the two axial ends of the artificial blood vessel 110 and are coaxially arranged with the artificial blood vessel 110.

[0031] The medical implant 100 can be used to treat a variety of diseases, such as hemangioma 01, aortic dissection 02, etc. For details, please refer to Figure 3When the medical implant 100 is used to treat the hemangioma 01, the medical implant 100 is implanted in the tumor-bearing vessel 03, the artificial blood vessel 110 covers the neck of the hemangioma 01, and the two first stent bodies 121 are respectively in contact with the blood vessel walls of the hemangioma 01 on both sides of the axial direction of the tumor-bearing vessel 03 to achieve the anchoring of the medical implant 100 in the tumor-bearing vessel 03. In this way, blood flows through the lumen of the medical implant 100 and is blocked by the artificial blood vessel 110 and does not enter the hemangioma 01. Please refer to Figure 4 When the medical implant 100 is used to treat aortic dissection 02, the medical implant 100 is implanted in the true lumen of the aorta 04, the artificial blood vessel 110 covers the rupture of the aortic dissection 02, and the two first stent bodies 121 respectively abut against the blood vessel walls located on both sides of the axial direction of the true lumen of the aorta 04 where the rupture of the aortic dissection 02 is located, so as to achieve the anchoring of the medical implant 100 in the aorta 04 and block the rupture of the aortic dissection 02. In this way, blood flows along the lumen of the medical implant 100 and does not enter the false lumen of the aorta 04 from the rupture of the aortic dissection 02, thereby reducing the risk of rupture of the aorta 04.

[0032] In this embodiment, the first stent body 121 may be a self-expanding stent structure or a balloon expandable stent structure, preferably a self-expanding stent structure to simplify the implantation procedure of the medical implant 100. When the first stent body 121 is a self-expanding stent structure, the material of the first stent body 121 is preferably a memory alloy, such as a nickel-titanium alloy with good biocompatibility. In addition, this embodiment does not limit the molding method of the first stent body 121, which can be formed by cutting or weaving.

[0033] The artificial blood vessel 110 is a soft and bendable structure. Thus, even if the diseased blood vessel is a curved blood vessel, the artificial blood vessel 110 can conform to the shape of the blood vessel and adhere closely to the blood vessel wall to effectively block the neck of the hemangioma 01 or the rupture of the aortic dissection 02.

[0034] The structure of the artificial blood vessel 110 can be similar to the prior art, and is a multi-layer structure. Figure 2 In an optional embodiment, the artificial blood vessel 110 is a three-layer structure, including an inner braided layer 111, an intermediate layer 112, and an outer braided layer 113 which are sequentially connected from the inside to the outside along the radial direction of the artificial blood vessel 110. The material of the inner braided layer 111 is polyvinyl alcohol or polylactic acid, the material of the intermediate layer 112 can be medical silica gel, and the material of the outer braided layer 113 can be polyvinyl alcohol or polylactic acid.

[0035] In addition, the embodiment of the utility model does not limit the connection method between the artificial blood vessel 110 and the first stent body 121, and the optional connection methods include but are not limited to any one of weaving, electrospinning, bonding, and welding.

[0036] Further, please refer back to Figure 1 , the anchoring mechanism 120 further includes a friction-enhancing structure (not marked in the figure), and the friction-enhancing structure is provided on the outer peripheral surface of at least one of the first stent bodies 121, and the friction-enhancing structure can increase the friction between the first stent body 121 and the blood vessel wall, so as to improve the anchoring stability of the medical implant 100 in the blood vessel and reduce the possibility of displacement of the medical implant 100. In a preferred embodiment, the friction-enhancing structure is provided on the outer peripheral surfaces of the two first stent bodies 121, so as to increase the interaction force between the medical implant 100 and the blood vessel wall at the axial ends of the artificial blood vessel 110, and improve the positioning stability of the medical implant 100 in the blood vessel.

[0037] Optionally, the friction-increasing structural component includes a plurality of hairs 122 , and the plurality of hairs 122 are dispersedly arranged on the outer peripheral surface of the corresponding first bracket body 121 .

[0038] Furthermore, the friction-increasing structural member is made of any suitable degradable material in the prior art, and gradually degrades as the implant time of the medical implant 100 increases. The reason for this arrangement is that in the early stage of implanting the medical implant 100 into the blood vessel, it is expected that the medical implant 100 can be stably anchored, so the anchoring performance of the anchoring mechanism 120 is enhanced by setting the friction-increasing structural member; and after the medical implant 100 is implanted into the blood vessel for a certain period of time, as the medical implant 100 gradually endothelializes, the medical implant 100 and the blood vessel wall gradually become an integrated structure and no longer need to rely on the anchoring force of the anchoring mechanism 120 for positioning. At this time, it is expected that as few foreign bodies as possible are introduced into the body to reduce the stimulation to the blood vessel wall, thereby reducing the possibility of hyperplasia of the blood vessel wall due to stimulation and causing vascular stenosis.

[0039] The delivery method of the medical implant 100 provided in this embodiment may be the same as the implantation method of the medical stent in the prior art. The following uses the example that the first stent body 121 is a self-expanding stent structure and the medical implant 100 is used to treat the hemangioma 01 to illustrate the implantation process of the medical implant 100, including: first, a sheath tube (not shown in the figure) is partially placed in the tumor-bearing blood vessel 03, and the distal end of the sheath tube reaches the distal end of the hemangioma 01. Then, the medical implant 100 is pressed and gripped in the sheath tube in any appropriate manner, and a pusher (not shown in the figure) connected to the proximal end of the medical implant 100 is used to push the medical implant 100 in the pressed state along the sheath tube to the distal end of the sheath tube. Then, the sheath tube is withdrawn to release the medical implant 100. The released medical implant 100 naturally expands at least partially to a radially expanded state. Thereafter, the connection between the medical implant 100 and the pusher is released. Finally, the pusher and the sheath tube are withdrawn.

[0040] It should be noted that the terms "proximal end" and "distal end" mentioned herein are described based on the relative positions and orientations of the various elements and components of the medical device. Although they are non-limiting, the "proximal end" is usually the end of the medical device that is close to the operator during normal use, and the "distal end" is the end of the medical device that first enters the patient's body. In addition, the proximal end of the medical implant 100 refers to the proximal end of the first stent body 121 located at the proximal end.

[0041] It should be understood that the proximal end of the medical implant 100 is connected to the pusher in a detachable manner so that the connection between the two can be released after the release of the medical implant 100 is completed. Optionally, the medical implant 100 and the pusher are mechanically connected, such as snap connection, plug connection, etc., so that the connection between the two is released by mechanical release, or the medical implant 100 and the pusher are fixedly connected, but the connection point can be broken under the condition of the presence of electrolyte and the introduction of electrical energy, that is, the proximal end of the medical implant 100 and the pusher can be released by electrolytic release. In addition, the sheath can be a single-lumen or multi-lumen tube, and its tube wall can be a single-layer structure or a multi-layer structure. The material used to make the sheath can be a polymer, and the optional polymer includes but is not limited to any one of polytetrafluoroethylene (PTFE), block polyether amide elastomer (Pebax), nylon, etc.

[0042] The medical implant system provided in this embodiment includes a pusher and the medical implant 100 as described above, wherein the pusher is detachably connected to one end of any one of the first stent bodies 121 of the medical implant 100 away from another first stent body 121. It can be understood that the first stent body 121 connected to the pusher is located at the proximal end of the artificial blood vessel 110.

[0043] One of the differences between the second embodiment of the present invention and the first embodiment is that the structure of the artificial blood vessel 110 is different. Figure 5 In this embodiment, the artificial blood vessel 110 includes an artificial blood vessel body 114 and a second support body 115, and the artificial blood vessel body 114 includes a plurality of segments 1141 arranged at intervals along its axial direction, and two adjacent segments 1141 are connected by one second support body 115.

[0044] For the convenience of description, in this embodiment, the component composed of the artificial blood vessel 110 and the anchoring mechanism 120 is referred to as a vascular implant. The vascular implant is particularly suitable for use with an embolic coil 130 (such as Figure 6 The device is used in combination with an occluder (shown in the figure) or an occluder (not shown in the figure) to treat a hemangioma 01 with a large volume and a large tumor neck or the aortic dissection 02.

[0045] Specifically, when the vascular implant is used in combination with the embolization coil 130 to treat the hemangioma 01, the operator first implants the vascular implant into the tumor-bearing vessel 03, and positions a second stent body 115 at the neck of the hemangioma 01. Then, the embolization coil 130 is released into the tumor cavity of the hemangioma 01 through the pores of the second stent body 115 at the neck of the hemangioma 01 using conventional methods, so that the embolization coil 130 is located outside the corresponding second stent body 115, and the corresponding second stent body 115 constitutes a stopper of the embolization coil 130, so as to limit the embolization coil 130 in the tumor cavity of the hemangioma 01, and prevent the embolization coil 130 from coming out of the neck of the hemangioma and falling into the tumor-bearing vessel 03 and causing a thromboembolic event.

[0046] When the vascular implant is used in combination with the occluder to treat the hemangioma 01, the operator first implants the vascular implant into the tumor-bearing vessel 03, and positions a second stent body 115 at the neck of the hemangioma 01. Then, the occluder is at least partially implanted into the tumor cavity through the pores of the second stent body 115 at the neck of the hemangioma 01 using a conventional method, and the occluder is connected to the second stent body 115. Thus, the occluder is at least partially located outside the corresponding second stent body 115, and the second stent body 115 constitutes a stopper of the occluder to prevent the occluder from coming out of the neck of the tumor and falling on the tumor-bearing vessel 03 and causing a thromboembolic event.

[0047] When the vascular implant is used in combination with the embolic coil 130 to treat the aortic dissection 02, the operator first implants the vascular implant into the true lumen of the aorta 04, and positions a second stent body 115 at the rupture of the aortic dissection 02. Then, the embolic coil 130 is implanted into the false lumen of the aorta 04 through the pores of the second stent body 115 at the rupture of the aortic dissection 02 using a conventional method. Thus, the second stent body 115 constitutes a stopper for the embolic coil 130 to limit the embolic coil 130 in the false lumen of the aorta, preventing the embolic coil 130 from coming out of the rupture of the aortic dissection 02 and falling into the aorta 04 and causing a thromboembolic event.

[0048] When the vascular implant is used in combination with the occluder to treat the aortic dissection 02, the operator first implants the vascular implant into the true lumen of the aorta 04, and positions one of the second stent bodies 115 at the rupture of the aortic dissection 02. Then, the occluder is at least partially implanted into the false lumen of the aorta 04 through the pores of the second stent body 115 at the rupture of the aortic dissection 02 using conventional methods, and the occluder is connected to the corresponding second stent body 115.

[0049] It should be understood that the structure of the artificial blood vessel body 114 can refer to the structure of the artificial blood vessel 110 in the first embodiment, and will not be repeated here. The second stent body 115 can be a self-expanding stent structure or a balloon expandable structure, preferably a self-expanding stent structure. When the second stent body 115 is a self-expanding stent structure, the material of the second stent body 115 is preferably a shape memory alloy, such as nickel-titanium alloy.

[0050] Those skilled in the art should also understand that the medical implant 100 may not include the embolic coil 130 or the occluder, or may include the embolic coil 130 or the occluder.

[0051] In addition, in this embodiment, the number of the second stent body 115 is at least one, that is, the number of the second stent body 115 can be one or more. Further, at least part of the outer peripheral surface of the second stent body can also be provided with villi (not shown in the figure), and the villi located at the part of the second stent body in contact with the blood vessel wall can enhance the friction between the second stent body and the blood vessel wall, thereby improving the positioning performance of the second stent body, so that it and the anchoring mechanism 120 together enhance the positioning of the vascular implant in the blood vessel, and for the part of the second stent body facing the neck of the hemangioma 01 or the rupture of the aortic dissection 02, the villi can extend into the aneurysm cavity of the hemangioma 01 or the false cavity of the aorta 04, playing a role in promoting thrombosis. The villi here are also preferably made of degradable materials.

[0052] The medical implant system provided in this embodiment includes a first pusher, which is detachably connected to one end of any one of the first stent bodies 121 on the vascular implant away from another first stent body 121. The first pusher is used to cooperate with the sheath to deliver and release the vascular implant to the true lumen of the tumor-bearing vessel 03 or the aorta 04.

[0053] Further, the medical implant system further includes a second pusher, which is detachably connected to the proximal end of the embolic coil 130 or the occluder. The second pusher is used to cooperate with the sheath tube to deliver and release the embolic coil 130 to the aneurysm cavity of the hemangioma 01 or the false lumen of the aorta 04 through the corresponding pores of the second stent body 115, or the second pusher is used to cooperate with the sheath tube to deliver and partially release the occluder to the aneurysm cavity of the hemangioma 01 or the false lumen of the aorta 04 through the corresponding pores of the second stent body 115.

[0054] Although the utility model is disclosed as above, it is not limited thereto. Those skilled in the art may make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the utility model and its equivalent technology, the utility model is also intended to include these modifications and variations.

Claims

1. A medical implant, characterized in that It includes an artificial blood vessel and an anchoring mechanism, wherein the anchoring mechanism includes a friction-increasing structure and two first bracket bodies, the two first bracket bodies are respectively connected to the axial ends of the artificial blood vessel and are coaxially arranged with the artificial blood vessel; the friction-increasing structure is provided on the outer peripheral surface of at least one of the first bracket bodies.

2. The medical implant according to claim 1, characterized in that The friction-increasing structural component includes a plurality of hairs, and the plurality of hairs are dispersedly arranged on the outer peripheral surface of the corresponding first bracket body.

3. The medical implant according to claim 1 or 2, characterized in that The material of the friction-increasing structural component is a degradable material.

4. The medical implant according to claim 1 or 2, characterized in that The artificial blood vessel comprises an artificial blood vessel body and a second stent body. The artificial blood vessel body comprises a plurality of segments arranged at intervals along its axial direction. Two adjacent segments are connected by one second stent body.

5. The medical implant according to claim 4, characterized in that The medical implant further comprises an embolic spring coil, each of which is used to be arranged on the outside of one of the second stent bodies.

6. The medical implant according to claim 4, characterized in that The medical implant further comprises an occluder, each of which is used to be at least partially disposed on the outside of one of the second stent bodies and is also connected to the corresponding second stent body.

7. The medical implant according to claim 4, characterized in that The first stent body and the second stent body are both self-expanding stent structures.

8. The medical implant according to claim 1, characterized in that The artificial blood vessel comprises an inner braided layer, a middle layer and an outer braided layer which are sequentially connected from inside to outside in the radial direction.

9. A medical implant system, characterized in that: The medical implant comprises a pusher and any one of claims 1 to 8, wherein the pusher is detachably connected to an end of any one of the first stent bodies away from another one of the first stent bodies.

Images