Wall-attached filter embolism protection umbrella and embolism protection device

Abstract

The present invention provides an adherent filter embolism protection umbrella and an embolism protection device, relating to the field of medical devices. The adherent filter embolism protection umbrella includes a proximal imaging ring, a support framework, and a pocket-shaped elastic filter membrane; the support framework includes a proximal support section and a middle support section; the proximal support section includes a plurality of proximal support beams, and the proximal ends of the plurality of proximal support beams are all connected to the proximal imaging ring; the middle support section includes a cylindrical adherent support portion, and the circumferential surface of the adherent support portion is a honeycomb mesh surface formed by connecting a plurality of sub-beams. The distal ends of the plurality of proximal support beams are connected to the proximal end of the adherent support portion at intervals in the circumferential direction along the radial direction of the adherent support portion; the elastic filter membrane covers the outside of the middle support section in such a way that the opening is expanded by the adherent support portion, and the opening of the elastic filter membrane faces the proximal imaging ring. The embolism protection device includes the aforementioned adherent filter embolism protection umbrella. The present invention alleviates the technical problems of poor wall adhesion at the entrance of the elastic filter membrane and small thrombus capacity of the umbrella body structure of the existing embolism protection device.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an adherent filter embolism protection umbrella and an embolism protection device. Background Art

[0002] Peripheral arterial vascular embolism diseases are a group of vascular diseases that seriously threaten human health, and their incidence has increased significantly in recent years. Common ones include arteriosclerotic occlusive disease, arterial thrombosis, aneurysm, etc. Among them: Lower extremity arteriosclerotic occlusive disease is the most common vascular surgical disease and the main cause of chronic lower extremity ischemia. Its incidence shows an upward trend with age. The incidence of lower extremity arteriosclerotic occlusive disease below 60 years old is about 5.6%, the incidence from 60 to 70 years old reaches 15.9%, and the incidence above 70 years old is about 33.8%. And the incidence of lower extremity arteriosclerotic occlusive disease in men is slightly higher than that in women. The cause of lower extremity arteriosclerotic occlusive disease is not yet clear. Hyperlipidemia, hypertension, diabetes, smoking, etc. are the main risk factors for lower extremity arteriosclerotic occlusive disease. The main cause of death is cardiovascular and cerebrovascular complications. The 5-year mortality rate of patients with intermittent claudication is about 30%, and the 5-year mortality rate of patients with lower extremity ischemia with rest pain, ulcer, and gangrene is 70%.

[0003] The pathological basis of peripheral arterial vascular embolism diseases is the formation of atherosclerotic plaques in limb arterial blood vessels, which causes lumen stenosis or occlusion, and secondary thrombus formation. The pathological changes are mainly manifested as the formation of atherosclerotic plaques in the vascular intima, early lipid deposition in the arterial intima to form fibrous plaques, necrosis of deep-layer cells in the fibrous plaques to form atherosclerotic plaques, atrophy and necrosis of the arterial media muscular layer, and deposition of collagen fibers and calcium. There may be no pathological changes in the arterial adventitia. After the formation of atherosclerotic plaques, atherosclerotic plaques and calcified plaques can protrude into the lumen, causing lumen stenosis or occlusion, leading to chronic ischemia of distal limb tissues. Hemorrhage or rupture in atherosclerotic plaques can cause arterial embolism, resulting in acute limb ischemia. The clinical manifestations of patients are symptoms such as intermittent claudication, rest pain, ischemic ulcers, and limb gangrene. The main physical signs include decreased skin temperature at the extremities, weakened or disappeared pulsation of the lower extremity arteries, decreased systolic blood pressure of the lower extremity arteries, skin trophic disorders, including thin skin, hair loss, nail deformation, etc., limb ulcers, gangrene, etc.

[0004] Interventional endovascular treatment has the characteristics of less trauma and lower requirements for the patient's own physical condition compared with traditional surgical operations. In recent years, with the development of medical materials and imaging technologies, endovascular treatment has been widely applied to the treatment of peripheral arterial vascular embolism diseases.

[0005] Percutaneous balloon angioplasty and stent implantation are one of the main means of endovascular treatment. Its principle is to relieve vascular stenosis through the physical expansion of the balloon and the radial supporting force of the stent, press atherosclerotic plaques against the arterial wall, increase the inner diameter of the stenotic segment of the blood vessel, and improve the blood supply to the distal limb. However, after many years of clinical application, it was found that the long-term patency rate of percutaneous balloon angioplasty and stent implantation is not ideal, and the ratio of patients requiring reintervention is relatively high. It has a good effect in treating short-segment lesions less than 3 cm, and the 5-year patency rate can reach 75%. However, the long-term patency rate is not ideal for long-segment stenosis and occlusion lesions. The 6-month patency rate of stenosis lesions less than 7 cm is 86.8%, while the 6-month patency rate of stenosis lesions greater than 7 cm is only 23.1%.

[0006] To address the above deficiencies of balloons and stents in lower extremity arterial diseases, many new interventional devices have emerged in recent years, such as catheter aspiration thrombectomy technology and plaque cutting technology. Due to their novel design concepts, they are widely used in clinical practice. Their working principle is to aspirate and mechanically cut atherosclerotic plaques in the arterial lumen through the high-speed water flow scouring at the distal end of the catheter and the rotary cutting blade, so that the atherosclerotic plaques in the arterial lumen are transported to the outside of the body through the catheter, which can effectively expand the lumen, reconstruct the blood flow channel and improve the distal blood supply. It is a good device for solving peripheral vascular sclerosis and occlusion lesions. However, whether using catheter aspiration technology or plaque rotary cutting technology, during the thrombectomy process, the calcified plaques in the arterial lumen will be broken, and the broken plaques are extremely likely to block the distal arterial blood vessels, resulting in the risk of necrosis or even amputation of the distal tissues due to poor blood circulation. Therefore, an embolization protection device is needed to filter out the emboli in the blood and then transport them to the outside of the body through the catheter to avoid distal embolization during the interventional thrombectomy operation.

[0007] However, currently, the existing embolization protection devices at least have the problem of poor wall attachment of the umbrella structure at the elastic filter membrane inlet. Specifically, the umbrella structure of the existing embolization protection devices is generally a structure in which an elastic filter membrane covers a spindle-shaped frame composed of multiple support rods. The inlet end of the elastic filter membrane is supported at multiple points by the parts in contact with the multiple support rods. The part of the elastic filter membrane located between two adjacent support rods is not supported, that is, this part of the structure of the elastic filter membrane does not fit the blood vessel wall. During filtration, this part of the structure of the elastic filter membrane will bend, resulting in some unfiltered blood flowing through the gap between the elastic filter membrane and the blood vessel wall to the distal blood vessel, blocking the distal blood vessel and causing necrosis of the distal tissue. In addition, the existing embolization protection devices also have the problem of small thrombus capacity. Summary of the Invention

[0008] The purpose of the present invention is to provide an adherent thrombus-filtering umbrella and an embolization protection device to alleviate the technical problems of poor wall attachment of the umbrella structure of the existing embolization protection device at the elastic filter membrane inlet and small thrombus capacity.

[0009] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0010] In a first aspect, an embodiment of the present invention provides an adherent filter plug protection umbrella, including a proximal imaging ring, a support framework, and a pocket-shaped elastic filter membrane;

[0011] The support framework includes a proximal support section and a middle support section;

[0012] The proximal support section includes a plurality of proximal support beams, and the proximal ends of the plurality of proximal support beams are all connected to the proximal imaging ring;

[0013] The middle support section includes a cylindrical adherent support portion, the circumferential surface of the adherent support portion is a honeycomb mesh surface formed by connecting a plurality of sub-beams, and the distal ends of the plurality of proximal support beams are connected to the proximal end of the adherent support portion at intervals in the circumferential direction of the radial direction of the adherent support portion in pairs;

[0014] The elastic filter membrane covers the outside of the middle support section in such a way that the opening is propped open by the adherent support portion, and the opening of the elastic filter membrane faces the proximal imaging ring.

[0015] In an alternative embodiment, the honeycomb mesh surface includes a plurality of hexagonal grid structures;

[0016] Along the same radial circumferential surface of the adherent support portion, a plurality of the hexagonal grid structures are continuously arranged to form a grid ring; in the same grid ring, two adjacent hexagonal grid structures share a sub-beam as a common side, the common side is parallel to the central axis of the adherent support portion, and the distal ends of the plurality of proximal support beams are respectively connected to the tips of the hexagonal grid structures of a grid ring at the proximal end of the adherent support portion.

[0017] In an alternative embodiment, along the proximal end of the adherent support portion to the distal end of the adherent support portion, multiple grid rings are continuously arranged in sequence, and along the proximal end of the adherent support portion to the distal end of the adherent support portion, two adjacent hexagonal grid structures are staggered with each other.

[0018] In an alternative embodiment, in each of the hexagonal grid structures: semi-circular connecting portions are provided at the proximal ends of the two proximal sub-beams and the distal ends of the two distal sub-beams; the free ends of the semi-circular connecting portions at the proximal ends of the two proximal sub-beams are connected to each other, and the free ends of the semi-circular connecting portions at the distal ends of the two distal sub-beams are connected to each other.

[0019] In an alternative embodiment, in each of the hexagonal grid structures: semicircular connecting portions are provided at both ends of each of the sub-beams, and the semicircular connecting portions at both ends of each of the sub-beams are bent in opposite directions; the free ends of the semicircular connecting portions at the ends of two adjacent sub-beams that are close to each other are connected to each other.

[0020] In an alternative embodiment, a developing member is provided on the common side or a developing coating is applied.

[0021] In an alternative embodiment, the middle support section further includes a plurality of first support beams and a plurality of second support beams;

[0022] The proximal ends of the plurality of first support beams are connected to the distal end of the wall-attached support portion at intervals in the circumferential direction of the radial direction of the wall-attached support portion in pairs, and the proximal ends of the plurality of second support beams are connected to the distal ends of the plurality of first support beams in one-to-one correspondence;

[0023] The plurality of first support beams enclose a frustum-shaped plug space with a diameter gradually decreasing from the proximal end to the distal end, and the plurality of second support beams enclose a straight cylindrical plug space.

[0024] In an alternative embodiment, the wall-attached filter plug umbrella further includes a distal developing ring;

[0025] The support skeleton further includes a distal support section, the distal support section includes a plurality of distal support beams, the proximal ends of the plurality of distal support beams are connected to the distal ends of the plurality of second support beams in one-to-one correspondence, and the distal ends of the plurality of distal support beams are all connected to the distal developing ring;

[0026] The plurality of distal support beams enclose a frustum-shaped plug space with a diameter gradually decreasing from the proximal end to the distal end.

[0027] In an alternative embodiment, the proximal support beam includes an S-shaped connecting section and a proximal straight section, the distal end of the S-shaped connecting section is connected to the proximal end of the wall-attached support portion, the proximal end of the S-shaped connecting section is connected to the distal end of the proximal straight section, and the proximal end of the proximal straight section is connected to the proximal developing ring.

[0028] In a second aspect, an embodiment of the present invention provides an embolization protection device, including a guide wire and the wall-attached filter plug umbrella according to any one of the foregoing embodiments; wherein, the guide wire passes through the proximal developing ring, and limiting blocks are provided at both sides of the guide wire located at the proximal developing ring, the proximal developing ring can rotate around the guide wire and the proximal developing ring can reciprocally slide along the guide wire between the two limiting blocks.

[0029] The embodiments of the present invention can achieve the following beneficial effects:

[0030] In a first aspect, an embodiment of the present invention provides an adherent filter plug protection umbrella, which includes a proximal imaging ring, a support framework, and a pocket-shaped elastic filter membrane; the support framework includes a proximal support section and a middle support section; the proximal support section includes multiple proximal support beams, and the proximal ends of the multiple proximal support beams are all connected to the proximal imaging ring; the middle support section includes a cylindrical adherent support part, and the peripheral surface of the adherent support part is a honeycomb network surface formed by connecting multiple sub-beams. The distal ends of the multiple proximal support beams are connected to the proximal end of the adherent support part at intervals in the radial circumferential direction of the adherent support part; the elastic filter membrane covers the outside of the middle support section in such a way that the opening is expanded by the adherent support part, and the opening of the elastic filter membrane faces the proximal imaging ring.

[0031] In this embodiment, since the peripheral surface of the adherent support part is a honeycomb network surface formed by connecting multiple sub-beams, and the elastic filter membrane covers the outside of the middle support section in such a way that the opening is expanded by the adherent support part, the adherent support part can support the opening of the elastic filter membrane, so that after the protection umbrella extends into the blood vessel, the opening of its elastic filter membrane can completely adhere to the blood vessel wall, that is, the opening of the elastic filter membrane has good wall adhesion to ensure that all embolism substances in the blood are filtered and intercepted by the elastic filter membrane, avoiding the problem that embolism substances leak between the opening of the elastic filter membrane and the blood vessel wall, causing downstream blood vessel blockage and tissue necrosis due to lack of nutrient delivery; in addition, the peripheral surface of the adherent support part is a honeycomb network surface formed by connecting multiple sub-beams, which provides sufficient radial support force for the whole protection umbrella, strengthens the support strength of the support framework, enables the elastic filter membrane to accommodate heavier thrombus without slipping, and thus increases the thrombus capacity of the protection umbrella.

[0032] In summary, the embodiment of the present invention at least alleviates the technical problems of poor wall adhesion at the elastic filter membrane inlet and small thrombus capacity of the umbrella structure of the existing embolism protection device.

[0033] A second aspect of the embodiment of the present invention further provides an embolism protection device, which includes a guide wire and the adherent filter plug protection umbrella provided in the first aspect; since the embolism protection device provided in the embodiment of the present invention includes the adherent filter plug protection umbrella provided in the first aspect, therefore, the embolism protection device provided in the embodiment of the present invention can achieve all the beneficial effects that the adherent filter plug protection umbrella provided in the first aspect can achieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 Isometric view of the overall structure of the wall-attached filter plug protection umbrella provided by the embodiment of the present invention;

[0036] Figure 2 Front view of the overall structure of the wall-attached filter plug protection umbrella provided by the embodiment of the present invention;

[0037] Figure 3 Is Figure 1 Isometric view of the overall structure of the support skeleton in the wall-attached filter plug protection umbrella shown in

[0038] Figure 4 Is Figure 2 Front view of the overall structure of the support skeleton in the wall-attached filter plug protection umbrella shown in

[0039] Figure 5 Schematic diagram of the overall structure of the developing component on the common side of adjacent hexagonal grid structures in the wall-attached filter plug protection umbrella provided by the embodiment of the present invention;

[0040] Figure 6 Is Figure 2 Schematic diagram of the overall structure of the embolism protection device formed by assembling the wall-attached filter plug protection umbrella on the guide wire in

[0041] Icon: 1 - proximal developing ring; 2 - support skeleton; 210 - proximal support section; 211 - proximal support beam; 2111 - proximal straight section; 2112 - proximal arc connecting section; 220 - middle support section; 2201 - developing component; 221 - wall-attached support part; 2210 - hexagonal grid structure; 2211 - sub-beam; 2212 - semi-circular connecting part; 222 - first support beam; 223 - second support beam; 230 - distal support section; 231 - distal support beam; 2311 - distal straight section; 2312 - distal arc connecting section; 3 - elastic filter membrane; 4 - distal developing ring; 5 - guide wire; 6 - limit block. Detailed implementation manners

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0044] It should be noted that like reference numerals and letters refer to like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0045] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "parallel", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0046] In addition, the term "proximal end" refers to the end closer to the human heart during surgery, that is, the upstream end of blood flow, and the "distal end" refers to the other end opposite to the "proximal end"; the term "parallel" does not mean that the components or the edges of the components are required to be absolutely parallel, but may be slightly inclined.

[0047] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The following will describe in detail some embodiments of the present invention with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0049] Embodiment 1

[0050] This embodiment provides an adherent filter plug protection umbrella. Refer to Figures 1-4The wall-attached filter plug protective umbrella includes a proximal developing ring 1, a supporting frame 2 and a pocket-shaped elastic filter membrane 3; the supporting frame 2 includes a proximal supporting section 210 and a middle supporting section 220; the proximal supporting section 210 includes a plurality of proximal supporting beams 211, and the proximal ends of the plurality of proximal supporting beams 211 are all connected to the proximal developing ring 1; the middle supporting section 220 includes a cylindrical wall-attached supporting portion 221, the circumferential surface of the wall-attached supporting portion 221 is a honeycomb mesh surface formed by connecting a plurality of sub-beams 2211, and the distal ends of the plurality of proximal supporting beams 211 are connected to the proximal end of the wall-attached supporting portion 221 in pairs along the radial circumferential direction of the wall-attached supporting portion 221; the elastic filter membrane 3 is covered on the outside of the middle supporting section 220 in a manner that the opening is opened by the wall-attached supporting portion 221, and the opening of the elastic filter membrane 3 faces the proximal developing ring 1.

[0051] refer to Figure 6 , the wall-attached filter embolism protective umbrella can be assembled on the guide wire 5 to form an embolic protection device by passing the guide wire 5 through the proximal developing ring 1 of the protective umbrella, and setting limit blocks 6 at the positions of the guide wire 5 on both sides of the proximal developing ring 1, wherein the proximal developing ring 1 can rotate around the guide wire 5 and the proximal developing ring 1 can slide back and forth between the two limit blocks 6 along the guide wire 5. During the operation, the wall-attached filter embolism protective umbrella is delivered to a distance of about 2cm-4cm distal to the affected part by using the guide catheter and the guide wire 5 and released to filter the thrombus. After the operation, the wall-attached filter embolism protective umbrella is withdrawn from the body by using the recovery catheter for recovery. Specifically, a first perforation is provided on the front end wall of the guide catheter, a second perforation is provided on the rear end wall of the guide catheter, and a third perforation is provided on the rear end wall of the recovery catheter. The delivery and recovery operation steps can be performed with reference to the following steps:

[0052] Delivery steps: first, insert the rear end of the guide wire 5 into the guide catheter from the front end of the guide catheter and pass the guide catheter out from the second perforation, hold the guide catheter, pull the rear end of the guide wire 5 until the wall-adherent filter embolism umbrella is completely pulled into the guide catheter and the distal end of the wall-adherent filter embolism umbrella is located at the rear side of the first perforation; then insert the guide wire 5 from the first perforation into the interior of the guide catheter, and the front end of the guide wire 5 passes out from the front end of the guide catheter; then slowly push the guide catheter and the guide wire 5 into the human body to ensure that the guide wire 5 delivers the guide catheter to the distal end of the affected part, and withdraw the guide wire 5 after reaching the distal end of the affected part, hold the guide wire 5, withdraw the guide catheter, and the wall-adherent filter embolism umbrella can be released and opened. At this time, the guide wire 5 can be used to place a stent or catheter to treat the affected part. During the treatment process, the opened umbrella filters the detached embolus to prevent the embolus from entering the downstream blood vessels and causing downstream tissue necrosis;

[0053] Retrieval step: After the treatment of the affected area is completed and the related treatment accessories are withdrawn, the rear end of the guide wire 5 is inserted into the retrieval catheter from the front end of the retrieval catheter, and the rear end of the guide wire 5 is passed out from the third perforation. The retrieval catheter is slowly pushed forward so that the protective umbrella containing the thrombus is gradually compressed and covered by the retrieval catheter, and then the guide wire 5 and the retrieval catheter are withdrawn from the blood vessel together, thereby achieving the purpose of recovering the distal protection device for the peripheral blood vessels.

[0054] During the entire operation, the proximal developing ring 1 is used as a key developing mark for surgical reference to determine the release and recovery position of the protective umbrella, thereby improving surgical efficiency and safety.

[0055] In this embodiment, since the peripheral surface of the wall-adhering support portion 221 is a honeycomb mesh surface formed by connecting a plurality of sub-beams 2211, the elastic filter membrane 3 is covered on the outside of the middle support section 220 in a manner that the opening is opened by the wall-adhering support portion 221, and the opening of the elastic filter membrane 3 can be supported by the wall-adhering support portion 221, so that after the protective umbrella is extended into the blood vessel, the opening of the elastic filter membrane 3 can be completely attached to the blood vessel wall, that is, the opening of the elastic filter membrane 3 has good wall adhesion, so as to ensure that all embolic substances in the blood are filtered and intercepted by the elastic filter membrane 3, and the problem of embolic substances leaking from the opening of the elastic filter membrane 3 and the blood vessel wall, causing downstream blood vessel blockage and tissue necrosis due to lack of nutrient transport, is avoided; in addition, the peripheral surface of the wall-adhering support portion 221 is a honeycomb mesh surface formed by connecting a plurality of sub-beams 2211, which provides sufficient radial support force for the protective umbrella as a whole, strengthens the support strength of the support frame 2, and enables the elastic filter membrane 3 to accommodate heavier thrombi without slipping, thereby increasing the thrombus capacity of the protective umbrella.

[0056] In summary, this embodiment at least alleviates the technical problems of the umbrella structure of the existing embolic protection device, such as poor wall adhesion at the entrance of the elastic filter membrane 3 and small embolic capacity.

[0057] In this embodiment, the portion of the elastic filter membrane 3 covering the peripheral surface of the wall-attached support portion 221 may or may not have filter holes. Preferably, Figure 1 and Figure 2 As shown, the elastic filter membrane 3 covers the peripheral surface of the wall-attached support portion 221 without filtering holes.

[0058] Continue to refer to Figures 1-4In an optional implementation of this embodiment, it is more preferred that the honeycomb mesh surface includes a plurality of hexagonal grid structures 2210. More specifically, along the same radial circumferential surface of the wall-attached support portion 221, a plurality of hexagonal grid structures 2210 are continuously arranged to form a grid circle; in the same grid circle, two adjacent hexagonal grid structures 2210 share a sub-beam 2211 as a common edge, and the common edge is parallel to the central axis of the wall-attached support portion 221, and the distal ends of the plurality of proximal support beams 211 are connected one by one to the tips of the hexagonal grid structures 2210 of a grid circle at the proximal end of the wall-attached support portion 221. In this structure, by having two adjacent hexagonal grid structures 2210 share a sub-beam 2211 as a common edge, the length of the common edge can be further extended, so as to further improve the wall-attachment at the opening of the elastic filter membrane 3 and increase the plug capacity of the protective umbrella.

[0059] Further preferably, multiple circles of mesh circles are arranged in sequence from the proximal end to the distal end of the wall support portion 221, and two adjacent hexagonal mesh structures 2210 are staggered from the proximal end to the distal end of the wall support portion 221.

[0060] Continue to refer to Figures 1-4 In the optional implementation of this embodiment, it is more preferred that in each hexagonal grid structure 2210: the proximal ends of the two sub-beams 2211 at the proximal end and the distal ends of the two sub-beams 2211 at the distal end are both provided with a semicircular connecting portion 2212; the free ends of the semicircular connecting portions 2212 at the proximal ends of the two sub-beams 2211 at the proximal end are connected to each other, and the free ends of the semicircular connecting portions 2212 at the distal ends of the two sub-beams 2211 at the distal end are connected to each other. By providing the semicircular connecting portion 2212, on the one hand, the stress at the connection between the two sub-beams 2211 during contraction and release can be reduced, and the service life can be improved; on the other hand, the peripheral surface of the wall-adhering support portion 221 after being expanded can form a standard circumferential surface, so as to further ensure that the opening of the elastic filter membrane 3 has very good wall adhesion. And further preferably, in each hexagonal grid structure 2210: both ends of each sub-beam 2211 are provided with semicircular connecting parts 2212, and the semicircular connecting parts 2212 at both ends of each sub-beam 2211 are bent in opposite directions; the free ends of the semicircular connecting parts 2212 at one end of two adjacent sub-beams 2211 that are close to each other are connected to each other.

[0061] In order to improve the developing property at the opening of the elastic filter membrane 3 of the wall-attached filter plug protective umbrella, in the optional implementation of this embodiment, it is more preferred that a developing component 2201 is provided on the above-mentioned common edge or a developing coating is coated thereon. The developing component 2201 can be, but is not limited to, Figure 5As shown, it is a developing spring wound around the common edge or a developing ring pressed onto the common edge. The developing spring is formed by winding a metal that does not project rays, and the end faces of both ends of each spring are ground flat so as not to touch or scratch the blood vessel or the elastic filter membrane 3. The ways of arranging the developing spring on the common edge include but are not limited to bonding, welding, pressing onto the common edge, etc. By arranging the developing component 2201 on the common edge or applying a developing coating on the common edge, the developing area at the entrance of the elastic filter membrane 3 can be made as large as possible, so as to improve the accuracy of the release or recovery position of the umbrella protector, thereby improving the surgical efficiency and increasing the surgical safety. To further improve the developability of the umbrella protector, the developing component 2201 can also be arranged on other sub-beams 2211 or a developing coating can be applied.

[0062] In addition, referring to Figure 3 and Figure 4 , in some alternative embodiments of the present embodiment, preferably, the middle support section 220 further includes a plurality of first support beams 222 and a plurality of second support beams 223. Specifically, the proximal ends of the plurality of first support beams 222 are connected to the distal end of the wall-adhering support portion 221 at intervals in the circumferential direction of the radial circle of the wall-adhering support portion 221, and the proximal ends of the plurality of second support beams 223 are connected to the distal ends of the plurality of first support beams 222 in one-to-one correspondence; the plurality of first support beams 222 enclose a frustum-shaped thrombus-containing space with a diameter gradually decreasing from the proximal end to the distal end, and the plurality of second support beams 223 enclose a cylindrical thrombus-containing space. Through such an arrangement, the thrombus-containing cavity of the wall-adhering filter thrombus umbrella protector can include a continuous structure of cylinder + cone + cylinder. There is an included angle between the frustum-shaped peripheral surface formed by the plurality of first support beams 222 and the blood vessel wall. In addition to the thrombus flowing out from the straight side surface of the cylindrical thrombus-containing space formed by the plurality of second support beams 223, when the thrombus is excessive and exceeds the proximal end of the second support beam 223, the blood can also flow through the inclined side surface of the frustum-shaped thrombus-containing space formed by the plurality of first support beams 222. Thus, while the wall-adhering filter thrombus umbrella protector can accommodate more embolism substances to filter thrombus, it ensures the smooth flow of blood and improves the safety of the operation.

[0063] Optionally, the widths of the first support beam 222 and the second support beam 223 can be greater than the width of the sub-beam 2211.

[0064] To further improve the developability of the umbrella protector, in an alternative embodiment of this embodiment, preferably, the wall-attached filter plug umbrella protector further includes a distal developing ring 4; the support framework 2 further includes a distal support section 230, and the distal support section 230 includes a plurality of distal support beams 231. The proximal ends of the plurality of distal support beams 231 are respectively connected to the distal ends of the plurality of second support beams 223, and the distal ends of the plurality of distal support beams 231 are all connected to the distal developing ring 4; the plurality of distal support beams 231 enclose a frustum-shaped plug space with a diameter gradually decreasing from the proximal end to the distal end. Specifically, the distal support beam 231 includes a distal arc connecting section 2312 and a distal straight section 2311; the proximal end of the distal arc connecting section 2312 is connected to the distal end of the second support beam 223, the distal end of the distal arc connecting section 2312 is connected to the proximal end of the distal straight section 2311, and the distal end of the distal straight section 2311 is connected to the distal developing ring 4. Of course, the above only provides some optional structures of the distal support beam 231 and does not limit the structure of the distal support beam 231. For example, but not limited to, the distal support beam 231 can also be a straight beam structure directly connected at a corner to the distal developing ring 4 and the distal support beam 231, etc.

[0065] In addition, to minimize the axial length of the umbrella protector so that the wall-attached filter plug umbrella protector can be applicable to a surgical site with a smaller anchoring area, in this embodiment, preferably, the proximal support beam 211 includes a proximal arc connecting section 2112 and a proximal straight section 2111. The distal end of the proximal arc connecting section 2112 is connected to the proximal end of the wall-attached support portion 221, the proximal end of the proximal arc connecting section 2112 is connected to the distal end of the proximal straight section 2111, and the proximal end of the proximal straight section 2111 is connected to the proximal developing ring 1; more preferably, the proximal support beam 211 includes an S-shaped connecting section and a proximal straight section 2111. The distal end of the S-shaped connecting section is connected to the proximal end of the wall-attached support portion 221, the proximal end of the S-shaped connecting section is connected to the distal end of the proximal straight section 2111, and the proximal end of the proximal straight section 2111 is connected to the proximal developing ring 1. Of course, the above only provides some optional structures of the proximal support beam 211 and does not limit the structure of the proximal support beam 211. For example, but not limited to, the proximal support beam 211 can also be a straight beam structure directly connected at a corner to the proximal developing ring 1 and the wall-attached support portion 221, etc.

[0066] In this embodiment, preferably, the support framework 2 is a structure integrally formed by cutting a nickel-titanium shape memory alloy.

[0067] Embodiment Two

[0068] This embodiment provides an embolization protection device, which includes a guide wire 5 and an adherent filter embolization protection umbrella provided by any optional implementation manner in the first embodiment. Among them, the guide wire 5 passes through the proximal imaging ring 1, and limiting blocks 6 are arranged at both sides of the proximal imaging ring 1 where the guide wire 5 is located. The proximal imaging ring 1 can rotate around the guide wire 5 and can reciprocally slide along the guide wire 5 between the two limiting blocks 6.

[0069] In this embodiment, the limiting block 6 can be, but is not limited to, welded to the guide wire 5.

[0070] Since the embolization protection device provided in this embodiment includes the adherent filter embolization protection umbrella described in the first embodiment, therefore, the embolization protection device provided in this embodiment can achieve all the beneficial effects that the adherent filter embolization protection umbrella in the first embodiment can achieve. Its specific structure and achievable effects can be obtained by referring to the optional or preferred implementation manners in the first embodiment.

[0071] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and the key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other; the above embodiments in this specification are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A wall-attached filter plug protection umbrella, characterized in that, It comprises a proximal developing ring (1), a supporting frame (2) and a pocket-shaped elastic filter membrane (3); The support frame (2) comprises a proximal support segment (210) and a middle support segment (220); The proximal support section (210) comprises a plurality of proximal support beams (211), and the proximal ends of the plurality of proximal support beams (211) are all connected to the proximal developing ring (1); The middle support section (220) comprises a cylindrical wall-adhering support portion (221), the peripheral surface of the wall-adhering support portion (221) is a honeycomb mesh surface formed by connecting a plurality of sub-beams (2211), and the distal ends of a plurality of proximal support beams (211) are connected to the proximal end of the wall-adhering support portion (221) in pairs along the radial circumferential direction of the wall-adhering support portion (221) at intervals; The elastic filter membrane (3) covers the outside of the middle support section (220) in a manner in which the opening is propped open by the wall-attached support portion (221), and the opening of the elastic filter membrane (3) faces the proximal developing ring (1); The middle support section (220) further comprises a plurality of first support beams (222) and a plurality of second support beams (223); The proximal ends of the plurality of first support beams (222) are connected to the distal end of the wall-attached support portion (221) in pairs along the radial circumferential direction of the wall-attached support portion (221), and the proximal ends of the plurality of second support beams (223) are connected to the distal ends of the plurality of first support beams (222) in a one-to-one correspondence; A plurality of the first support beams (222) surround a frustum-shaped bolt space whose diameter gradually decreases from the proximal end to the distal end, and a plurality of the second support beams (223) surround a straight cylinder-shaped bolt space.

2. The adherent filter plug protection umbrella according to claim 1, characterized in that The honeycomb mesh surface includes a plurality of hexagonal grid structures (2210); Along the same radial circumferential surface of the wall-attached support portion (221), a plurality of the hexagonal grid structures (2210) are continuously arranged to form a grid circle; in the same grid circle, two adjacent hexagonal grid structures (2210) share a sub-beam (2211) as a common edge, and the common edge is parallel to the central axis of the wall-attached support portion (221), and the distal ends of the plurality of proximal support beams (211) are connected one-to-one to the tips of the hexagonal grid structures (2210) of a grid circle proximal to the wall-attached support portion (221).

3. The adherent filter plug protection umbrella according to claim 2, wherein, Along the proximal end of the wall-adhering support portion (221) to the distal end of the wall-adhering support portion (221), a plurality of circles of the grid circles are arranged in sequence and continuously, and along the proximal end of the wall-adhering support portion (221) to the distal end of the wall-adhering support portion (221), two adjacent hexagonal grid structures (2210) are staggered with each other.

4. The wall-adherent filter plug protective umbrella according to claim 2 or 3, characterized in that: In each of the hexagonal grid structures (2210): Semicircular connecting parts (2212) are provided at the proximal ends of the two proximal sub-beams (2211) and the distal ends of the two distal sub-beams (2211); the free ends of the semicircular connecting parts (2212) at the proximal ends of the two proximal sub-beams (2211) are connected to each other, and the free ends of the semicircular connecting parts (2212) at the distal ends of the two distal sub-beams (2211) are connected to each other.

5. The adherent filter plug protection umbrella according to claim 4, wherein In each of the hexagonal grid structures (2210): Semicircular connecting parts (2212) are provided at both ends of each sub-beam (2211), and the semicircular connecting parts (2212) at both ends of each sub-beam (2211) are bent in opposite directions; the free ends of the semicircular connecting parts (2212) at the ends of two adjacent sub-beams (2211) close to each other are connected to each other.

6. The adherent filter plug protection umbrella according to claim 2, wherein, A developing component (2201) is provided on the common side or a developing coating is applied.

7. The adherent filter plug protection umbrella according to claim 1, characterized in that, The wall-attached filter plug protection umbrella further includes a distal developing ring (4); The support skeleton (2) further includes a distal support section (230), the distal support section (230) includes a plurality of distal support beams (231), the proximal ends of the plurality of distal support beams (231) are connected to the distal ends of the plurality of second support beams (223) in one-to-one correspondence, and the distal ends of the plurality of distal support beams (231) are all connected to the distal developing ring (4); The plurality of distal support beams (231) enclose a frustum-shaped plug space with a diameter gradually decreasing from the proximal end to the distal end.

8. The adherent filter plug protection umbrella according to claim 1, characterized in that, The proximal support beam (211) includes an S-shaped connecting section and a proximal straight section (2111), the distal end of the S-shaped connecting section is connected to the proximal end of the wall-attached support part (221), the proximal end of the S-shaped connecting section is connected to the distal end of the proximal straight section (2111), and the proximal end of the proximal straight section (2111) is connected to the proximal developing ring (1).

9. An embolization protection device, characterized in that, It includes a guide wire (5) and the wall-attached filter plug protection umbrella according to any one of claims 1-8; Wherein, the guide wire (5) passes through the proximal developing ring (1), and limiting blocks (6) are provided at both sides of the proximal developing ring (1) where the guide wire (5) is located, and the proximal developing ring (1) can rotate around the guide wire (5) and the proximal developing ring (1) can reciprocally slide along the guide wire (5) between the two limiting blocks (6).

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