Reverse penetration remote protection device

Abstract

The present invention provides a reverse penetration distal protection device, which relates to the field of medical devices, including a guide wire and a protective umbrella; in the protective umbrella: a support tube is reversely sleeved on the outside of the guide wire; a strip opening is provided on the wall of the support tube, and a developing component or a developing coating is provided at the proximal end of the support tube; a sliding guide portion of a guide limit block is slidably provided in the strip opening and connected to the guide wire, and a fixed limit portion of the guide limit block is located outside the support tube; a first end of an elastic support open loop is connected to the proximal end of the support tube, and a second end is connected to a fixed limit portion; a developing component or a developing coating is provided on the elastic support open loop; an elastic filter membrane surrounds and is connected to the support tube along the axial direction of the support tube, and an opening of the elastic filter membrane is connected to the elastic support open loop. The present invention alleviates the technical problem that when the guide wire is inserted into the existing peripheral vascular distal protection device in the antegrade direction, that is, along the blood flow direction, it is difficult for the guide wire to pass through the harder lesion thrombus in the artery, thereby making the operation more difficult and complex, increasing the risk of the operation and being unfavorable for postoperative recovery.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a reverse penetration distal protection device. Background Art

[0002] Peripheral arterial embolic disease is a group of vascular diseases that seriously threaten human health. Its incidence has increased significantly in recent years. Common diseases include arteriosclerosis obliterans, arterial thrombosis, and aneurysms. Among them, lower extremity arteriosclerosis obliterans is the most common vascular surgical disease and the main cause of chronic lower extremity ischemia. Its incidence increases with age. The incidence of lower extremity arteriosclerosis obliterans is about 5.6% in people under 60 years old, 15.9% in people aged 60 to 70 years old, and about 33.8% in people over 70 years old. The incidence of lower extremity arteriosclerosis obliterans in men is slightly higher than that in women. The cause of lower extremity arteriosclerosis obliterans is still unclear. Hyperlipidemia, hypertension, diabetes, and smoking are the main risk factors for lower extremity arteriosclerosis obliterans. Deaths are mainly caused by 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, ulcers, and gangrene is 70%.

[0003] The pathological basis of peripheral arterial embolic disease is the formation of atherosclerotic plaques in the limb arteries, which causes stenosis or occlusion of the lumen and secondary thrombosis. The pathological changes are mainly manifested in the formation of atherosclerotic plaques in the vascular intima, early lipid deposition in the arterial intima, the formation of fibrous plaques, necrosis of deep cells in the fibrous plaques to form atherosclerotic plaques, atrophy and necrosis of the muscular layer of the arterial media, and deposition of collagen fibers and calcium. The adventitia of the artery may not have pathological changes. After the formation of atherosclerotic plaques, atherosclerotic plaques and calcified plaques may protrude into the lumen, causing stenosis or occlusion of the lumen, leading to chronic ischemia of distal limb tissues, and bleeding or rupture of atherosclerotic plaques can cause arterial embolism and acute limb ischemia. The patients' clinical manifestations include intermittent claudication, rest pain, ischemic ulcers and limb gangrene. The main signs include decreased skin temperature of the extremities, weakened or absent lower limb arterial pulsation, decreased lower limb arterial systolic pressure, nutritional changes in the skin, including thin skin, hair loss, nail deformation, limb ulcers, gangrene, etc.

[0004] Interventional endovascular treatment is less invasive and has lower requirements on the patient's physical condition than traditional surgical operations. In recent years, with the development of medical materials and imaging technology, endovascular treatment has been widely used in the treatment of peripheral arterial embolic disease.

[0005] Percutaneous balloon angioplasty and stenting are one of the main means of endovascular treatment. The principle is to relieve vascular stenosis through the physical expansion of the balloon and the radial support force of the stent, press the atherosclerotic plaque against the arterial wall, increase the inner diameter of the stenotic segment, and improve the blood supply to the distal limbs. However, after many years of clinical application, it was found that the long-term vascular patency rate of percutaneous balloon angioplasty and stenting is not ideal, and the rate of re-intervention is high. It is more effective in treating short-segment lesions <3cm, with a 5-year patency rate of 75%, but the long-term patency rate of long-segment stenosis and occlusion lesions is not ideal. The 6-month patency rate of stenotic lesions <7cm is 86.8%, while the 6-month patency rate of stenotic lesions >7cm is only 23.1%.

[0006] In order to solve the above shortcomings of balloons and stents in lower extremity arterial lesions, many new interventional devices have emerged in recent years, such as catheter aspiration embolism technology and plaque cutting technology. Due to its novel design concept, it has been widely used in clinical practice. Its working principle is to use high-speed water flow at the catheter head end to flush and then aspirate and mechanically cut the atheromatous plaque in the arterial lumen through the catheter to be transported to the outside of the body, which can effectively expand the lumen, rebuild the blood flow channel and improve the distal blood supply. It is a good device for solving peripheral vascular sclerosis and occlusive lesions. However, whether it is catheter aspiration technology or plaque cutting technology, the calcified plaque in the arterial lumen will be broken during the embolism removal process. The broken plaque is very likely to block the distal artery, causing the risk of necrosis or even amputation of the distal tissue due to poor blood circulation. Therefore, it is necessary to use a distal protection device for peripheral blood vessels to filter out the emboli in the blood, and then transport them to the outside of the body through a catheter to avoid distal embolism during interventional embolectomy.

[0007] During the operation, the guidewire of the peripheral vascular distal protection device needs to be passed through the diseased area first, and then the guidewire is used to introduce other treatment catheters through the tortuous blood vessels. However, the arterial plaque is hard, and when the guidewire is inserted in the antegrade direction, that is, along the direction of blood flow, it is difficult for the guidewire to pass through the diseased thrombus, making the operation more difficult and complex, increasing the surgical risk and not conducive to the patient's postoperative recovery. Summary of the invention

[0008] The purpose of the present invention is to provide a retrograde distal protection device to alleviate the technical problem that when the existing peripheral vascular distal protection device is inserted in the antegrade direction, that is, along the direction of blood flow, the guide wire is difficult to pass through the harder arterial lesion thrombus, thereby increasing the difficulty and complexity of the operation, increasing the risk of the operation and being not conducive to the patient's postoperative recovery.

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

[0010] The embodiment of the present invention provides a reverse penetration distal protection device, comprising a guide wire and a protection umbrella; the protection umbrella comprises a support tube, an elastic support open ring, a guide limit block and a pocket-shaped elastic filter membrane;

[0011] The support tube is reversely sleeved on the outside of the guide wire;

[0012] The tube wall of the support tube is provided with a strip opening penetrating the tube wall of the support tube and extending along the axial direction of the support tube, and a developing component is connected to the proximal end of the support tube or a developing coating is coated on the outer peripheral surface of the proximal end of the support tube;

[0013] The guide limit block comprises a fixed limit portion and a sliding guide portion which are integrated or fixedly connected, the sliding guide portion is slidably arranged inside the strip-shaped opening and fixedly connected to the guide wire, and the fixed limit portion is located outside the support tube;

[0014] The first end of the elastic support open ring is integrally or fixedly connected to the proximal end of the support tube, and the second end of the elastic support open ring is bent toward the distal end at a position close to the first end of the elastic support open ring and then integrally or fixedly connected to the fixed limit portion; a developing component is connected to the elastic support open ring or a developing coating is coated on the elastic support open ring;

[0015] The elastic filter membrane surrounds and is connected to the support tube along the axial direction of the support tube, and the opening of the elastic filter membrane is connected to the elastic support open ring.

[0016] In an optional embodiment, a through hole is provided on the sliding guide portion and penetrates the sliding guide portion along the axial direction of the support tube, and the guide wire passes through and is fixedly connected to the inside of the through hole.

[0017] In an optional embodiment, the sliding guide portion is in a circular tube shape, and the outer peripheral wall of the sliding guide portion is in contact with the tube wall of the support tube.

[0018] In an optional embodiment, a mounting groove is provided on the fixed limiting portion, and the second end of the elastic support open ring is inserted into and fixedly connected to the mounting groove.

[0019] In an optional embodiment, a stepped surface is formed between a proximal end surface of the fixed limiting portion and a proximal end surface of the sliding guide portion, and the proximal end surface of the fixed limiting portion is located at a distal end of the sliding guide portion.

[0020] In an optional embodiment, the developing component includes a proximal developing ring connected to the proximal end of the supporting tube, and the guide wire passes through the proximal developing ring.

[0021] In an optional embodiment, a distal developing ring is connected to the distal end of the support tube, and the guide wire passes through the distal developing ring.

[0022] In an optional embodiment, the distal end region of the elastic filter membrane is formed as a continuous membrane region without filter holes.

[0023] In an optional embodiment, the opening edge of the elastic filter membrane is rolled and fixed to form a tubular edge, and the elastic support open loop passes through the tubular edge.

[0024] In an optional embodiment, a distal support ring is also connected to the distal end of the support tube, and the elastic filter membrane is connected to the surface of the distal support ring or supported on the outside of the distal support ring; a developing component is provided on the distal support ring or a developing coating is coated on the distal support open ring.

[0025] The embodiments of the present invention can achieve the following beneficial effects:

[0026] An embodiment of the present invention provides a reverse penetration distal protection device, comprising a guide wire and a protection umbrella; wherein the protection umbrella comprises a support tube, an elastic support open ring, a guide limit block and a pocket-shaped elastic filter membrane. Specifically, the support tube is reversely sleeved on the outside of the guide wire; a strip opening is opened on the tube wall of the support tube, which penetrates the tube wall of the support tube and extends along the axial direction of the support tube, and a developing component is connected to the proximal end of the support tube or a developing coating is coated on the proximal outer peripheral surface of the support tube 2; the guide limit block includes a fixed limit part and a sliding guide part that are integrally or fixedly connected, the sliding guide part is slidably arranged inside the strip opening and fixedly connected to the guide wire, and the fixed limit part is located outside the support tube; the first end of the elastic support open loop is integrally or fixedly connected to the proximal end of the support tube, and the second end of the elastic support open loop is bent toward the distal direction at a position close to the first end of the elastic support open loop and is integrally or fixedly connected to the fixed limit part; a developing component is connected to the elastic support open loop or a developing coating is coated on the elastic support open loop; the elastic filter membrane surrounds and is connected to the support tube along the axial direction of the support tube, and the opening of the elastic filter membrane is connected to the elastic support open loop.

[0027] The embodiment of the present invention is an improved distal protection device for existing peripheral vascular distal protection devices based on the principle that the guidewire can be inserted retrogradely, that is, it is easier to pass through the diseased thrombus in the opposite direction of blood flow. The device can retrogradely pass the protective umbrella guidewire through the lesion site to implement treatment. After the treatment is completed, the intercepted thrombus is removed from the blood vessel. There is no leakage of the thrombus during the removal process. It has at least the beneficial effects of simple operation, reduced surgical difficulty and risk, and conducive to the patient's postoperative recovery.

[0028] In addition, in the embodiment of the present invention, the elastic filter membrane is supported by providing an elastic support open loop, thereby supporting the opening of the elastic filter membrane, so that after the protective umbrella of the reverse penetration distal protection device is extended into the blood vessel, the opening of the elastic filter membrane can be completely attached to the blood vessel wall, that is, the opening of the elastic filter membrane has good wall adhesion, so as to ensure that all embolic substances in the blood are filtered and intercepted by the elastic filter membrane, avoiding the problem of embolic substances leaking from the opening of the elastic filter membrane and the blood vessel wall, causing blockage of downstream blood vessels and tissue necrosis due to lack of nutrient delivery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the overall structure of a reverse penetration remote protection device provided by an embodiment of the present invention;

[0031] Figure 2 A cross-sectional view of the overall structure of a protective umbrella in a reverse penetration distal protection device provided by an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the overall structure of a guide limit block in a reverse penetration remote protection device provided by an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the overall structure of an elastically supported open loop in a reverse penetration distal protection device provided in an embodiment of the present invention.

[0034] Icons: 1-guide wire; 2-support tube; 20-strip opening; 21-proximal developing ring; 22-distal developing ring; 3-elastic supporting open ring; 4-guide limit block; 41-fixed limit part; 410-installation groove; 42-sliding guide part; 420-perforation; 5-elastic filter membrane; 50-tubular edge. DETAILED DESCRIPTION

[0035] In order to make the purpose, 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 drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invented product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] 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 “distal end” refers to the other end opposite to the “proximal end”.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" 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 direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances; the fixed connection clearly specified includes but is not limited to bonding, welding, etc.

[0041] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0042] This embodiment provides a reverse penetration remote protection device, referring to Figure 1-Figure 4 The reverse penetration distal protection device includes a guide wire 1 and a protection umbrella; wherein the protection umbrella includes a support tube 2, an elastic support open ring 3, a guide limit block 4 and a pocket-shaped elastic filter membrane 5.

[0043] Specifically, the support tube 2 is reversely sleeved on the outside of the guide wire 1; a strip opening 20 is provided on the tube wall of the support tube 2, which penetrates the tube wall of the support tube 2 and extends along the axial direction of the support tube 2; a developing component is connected to the proximal end of the support tube 2 or a developing coating is coated on the proximal outer peripheral surface of the support tube 2. The guide limit block 4 includes a fixed limit portion 41 and a sliding guide portion 42 which are integrally or fixedly connected; the sliding guide portion 42 is slidably arranged inside the strip opening 20 and fixedly connected to the guide wire 1; the fixed limit portion 41 is located outside the support tube 2. The first end of the elastic support open ring 3 is integrally or fixedly connected to the proximal end of the support tube 2; the second end of the elastic support open ring 3 is bent toward the distal direction at a position close to the first end of the elastic support open ring 3 and then integrally or fixedly connected to the fixed limit portion 41; a developing component is connected to the elastic support open ring 3 or a developing coating is coated on the elastic support open ring 3, for example but not limited to, a developing spring is sleeved on the outside of the elastic support open ring 3. The elastic filter membrane 5 surrounds and is connected to the support tube 2 along the axial direction of the support tube 2, and the opening of the elastic filter membrane 5 is connected to the elastic support open ring 3. In this embodiment, the elastic support open ring 3 can be, but is not limited to, a spring-like structure formed by winding a radiopaque metal wire.

[0044] Reference Figure 1During the operation, the protective umbrella of the peripheral vascular distal protection device is transported to the affected area about 2cm-4cm away from the distal end by using a guide catheter and a guide wire and released to filter the thrombus. After the operation, the protective umbrella of the retrograde distal protection device is withdrawn from the body by using a recovery catheter for recovery. Specifically, a first perforation is provided on the front end tube wall of the guide catheter, a second perforation is provided on the rear end tube wall of the guide catheter, and a third perforation is provided on the rear end tube wall of the recovery catheter. The transport and recovery operation steps can refer to the following steps: Transport step: First, the rear end of the guide wire 1 of the retrograde distal protection device is inserted into the guide catheter from the front end of the guide catheter and passes through the guide catheter from the second perforation. The guide catheter is held and the rear end of the guide wire 1 is pulled until the protective umbrella is completely pulled into the guide catheter and the proximal end of the protective umbrella is located on the rear side of the first perforation; then the guide wire is inserted from the first perforation into the interior of the guide catheter, and the front end of the guide wire passes out from the front end of the guide catheter; then the guide catheter and the guide wire are slowly pushed into the human body in the opposite direction of the blood flow to ensure The guide wire delivers the guide catheter to the distal end of the affected part. After reaching the distal end of the affected part, the guide wire 1 is withdrawn. The guide wire 1 is held and the guide catheter is withdrawn. The elastic support open ring 3 at the proximal end of the protective umbrella is first released and opened, and the rear end of the protective umbrella is slowly released from the guide catheter. During the release process, the elastic support open ring 3 is restored to a circular ring structure under the action of elastic rebound force to open the protective umbrella. The opened protective umbrella can slide a certain distance in the axial direction to ensure that the protective umbrella and the guide wire 1 can move relative to each other, which is conducive to appropriately pushing forward or withdrawing a certain distance of the guide wire 1 in subsequent operations. After the protective umbrella is opened, the guide wire 1 can be used to place a stent or a catheter to treat the affected part. During the treatment process, the opened protective umbrella filters the detached embolus to prevent the embolus from entering the downstream blood vessels and causing downstream tissue necrosis.

[0045] Recycling step: after the treatment of the affected part is completed and the accessories for related treatment are withdrawn, the rear end of the guide wire 1 is inserted into the recycling catheter from the front end of the recycling catheter, the guide wire 1 is passed out from the third perforation, and the recycling catheter is slowly pushed forward. When the front end of the recycling catheter first abuts against the distal end of the protective umbrella, the guide wire 1 is pulled backward, and the sliding guide part 42 of the guide limit block 4 connected to the guide wire 1 slides along the strip opening 20 toward the distal end of the protective umbrella, so that the elastic filter membrane 5 close to the opening gradually shrinks. When the fixed limit part 41 of the guide limit block 4 contacts the distal end surface of the strip opening 20, the opening of the elastic filter membrane 5 of the protective umbrella is completely sealed. At this time, the thrombus intercepted by the protective umbrella will not leak out, and the guide wire 1 is continued to be pulled backward. The fixed limit part 41 of the guide limit block 4 drives the elastic support open ring 3 to slide toward the inside of the recycling catheter, and the protective umbrella containing the thrombus is gradually compressed and covered by the recycling catheter. Then the guide wire 1 and the recycling catheter are withdrawn from the blood vessel together, that is, the purpose of recycling the distal protection device for peripheral blood vessels is achieved.

[0046] During the entire operation, the developing component connected to the proximal end of the support tube 2 and the developing component connected to the elastic support ring 3 or the developing coating coated on the elastic support open ring 3 are used as key developing marks for surgical reference to determine the release and recovery positions of the protective umbrella and the entrance position of the elastic filter membrane 5 in the open state, thereby improving surgical efficiency and safety.

[0047] The embodiment of the present invention is an improved distal protection device for existing peripheral vascular distal protection devices based on the principle that it is easier to insert the guidewire 1 in retrograde direction, that is, to pass through the diseased thrombus in the opposite direction of blood flow. The device can retrogradely pass the protective umbrella guidewire 1 through the diseased part to implement treatment. After the treatment is completed, the intercepted thrombus is removed from the blood vessel. There is no leakage of the thrombus during the removal process. It has at least the beneficial effects of simple operation, reduced surgical difficulty and risk, and conducive to the patient's postoperative recovery.

[0048] In addition, in this embodiment, the elastic support open loop 3 is provided to support the elastic filter membrane 5, thereby supporting the opening of the elastic filter membrane 5, so that after the protective umbrella of the reverse penetration distal protection device is extended into the blood vessel, the opening of the elastic filter membrane 5 can be completely attached to the blood vessel wall, that is, the opening of the elastic filter membrane 5 has good wall adhesion, so as to ensure that all embolic substances in the blood are filtered and intercepted by the elastic filter membrane 5, and avoid the leakage of embolic substances from the opening of the elastic filter membrane 5 and the blood vessel wall, causing downstream blood vessel blockage and tissue necrosis due to lack of nutrient delivery.

[0049] Reference Figure 3 In an optional implementation of the present embodiment, a through hole 420 is provided on the sliding guide portion 42 and passes through the sliding guide portion 42 along the axial direction of the support tube 2, and the guide wire 1 passes through and is fixedly connected to the inside of the through hole 420. To improve the sliding stability, preferably, the sliding guide portion 42 is in a round tube shape, and the outer peripheral wall of the sliding guide portion 42 contacts the tube wall of the support tube 2.

[0050] Continue to refer to Figure 3 In an optional implementation manner of the present embodiment, a mounting groove 410 is provided on the fixed limiting portion 41 , and the second end of the elastic supporting open ring 3 is inserted into and fixedly connected to the mounting groove 410 .

[0051] Continue to refer to Figure 3 In an optional implementation of the present embodiment, preferably, a step surface is formed between the proximal end surface of the fixed limiting portion 41 and the proximal end surface of the sliding guide portion 42, and the proximal end surface of the fixed limiting portion 41 is located at the distal end of the sliding guide portion 42.

[0052] Reference Figure 1 and Figure 2In the optional structure of this embodiment, it is more preferred that the developing component includes a proximal developing ring 21 connected to the proximal end of the support tube 2, and the guide wire 1 passes through the proximal developing ring 21. Optionally, a distal developing ring 22 is also connected to the distal end of the support tube 2, and the guide wire 1 passes through the distal developing ring 22. The proximal developing ring 21 and the distal developing ring 22 can be but are not limited to being welded or bonded or threadedly connected to the corresponding ends of the support tube 2, and the proximal developing ring 21 and the distal developing ring 22 are preferably but not limited to being made of metal pipes that do not project lines, and the outer ring surface of the developing ring is preferably a polished smooth plane to avoid touching or scratching the blood vessels or the elastic filter membrane 5.

[0053] In an optional implementation manner of this embodiment, the overall outer contour of the elastic filter membrane 5 in the open state is formed into a cone.

[0054] In addition, in order to accommodate smaller emboli and prevent blood clots from leaking, in the optional structure of this embodiment, it is more preferred that the distal end area of ​​the elastic filter membrane 5 is formed as a continuous coating area without filtering holes.

[0055] Reference Figure 1 and Figure 2 In an optional implementation manner of the present embodiment, it is more preferred that the opening edge of the elastic filter membrane 5 is rolled and fixed to form a tubular edge portion 50 , and the elastic support open loop 3 passes through the tubular edge portion 50 .

[0056] In order to further improve the developing property of the reverse-penetrating distal protection device, in some optional implementations of the present embodiment, it is more preferred that a distal support ring (not shown) is also connected to the distal end of the support tube 2, and the elastic filter membrane 5 is connected to the surface of the distal support ring or supported on the outside of the distal support ring; a developing component is provided on the distal support ring or a developing coating is applied on the distal support open ring to effectively obtain the overall length and specific position morphological information of the protective umbrella, thereby further improving the convenience and safety of the operation. In this case, the overall outer contour of the elastic filter membrane 5 in the open state can be but is not limited to being formed into a frustum shape.

[0057] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other; the above embodiments in this specification are only used to illustrate the technical solution of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that: it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.

Claims

1. A reverse penetration remote protection device, characterized in that: It comprises a guide wire (1) and a protective umbrella; the protective umbrella comprises a support tube (2), an elastic support open ring (3), a guide limit block (4) and a pocket-shaped elastic filter membrane (5); The support tube (2) is reversely sleeved on the outside of the guide wire (1); The support tube (2) is provided with a strip-shaped opening (20) penetrating the support tube (2) and extending in the axial direction of the support tube (2); a developing component is connected to the proximal end of the support tube (2) or a developing coating is applied to the outer peripheral surface of the proximal end of the support tube (2); The guide limit block (4) comprises a fixed limit portion (41) and a sliding guide portion (42) which are integrated or fixedly connected, the sliding guide portion (42) being slidably arranged inside the strip-shaped opening (20) and fixedly connected to the guide wire (1), and the fixed limit portion (41) being located outside the support tube (2); The first end of the elastic support open ring (3) is integrally or fixedly connected to the proximal end of the support tube (2); the second end of the elastic support open ring (3) is bent toward the distal end at a position close to the first end of the elastic support open ring (3) and then integrally or fixedly connected to the fixed limit portion (41); a developing component is connected to the elastic support open ring (3) or a developing coating is coated on the elastic support open ring (3); The elastic filter membrane (5) surrounds and is connected to the support tube (2) along the axial direction of the support tube (2), and the opening of the elastic filter membrane (5) is connected to the elastic support open ring (3); The sliding guide portion (42) is provided with a through hole (420) penetrating the sliding guide portion (42) along the axial direction of the support tube (2), and the guide wire (1) passes through and is fixedly connected to the inside of the through hole (420); the sliding guide portion (42) is in the shape of a circular tube, and the outer peripheral wall of the sliding guide portion (42) is in contact with the tube wall of the support tube (2); A stepped surface is formed between the proximal end surface of the fixed limiting portion (41) and the proximal end surface of the sliding guide portion (42), and the proximal end surface of the fixed limiting portion (41) is located on the distal side of the proximal end surface of the sliding guide portion (42).

2. The reverse penetration remote protection device according to claim 1, characterized in that: The fixed limiting portion (41) is provided with a mounting groove (410), and the second end of the elastic support open ring (3) is inserted into and fixedly connected to the mounting groove (410).

3. The reverse penetration remote protection device according to claim 1, characterized in that: The developing component of the support tube (2) comprises a proximal developing ring (21) connected to the proximal end of the support tube (2), and the guide wire (1) passes through the proximal developing ring (21).

4. The reverse penetration remote protection device according to claim 1, characterized in that: A distal developing ring (22) is connected to the distal end of the support tube (2), and the guide wire (1) passes through the distal developing ring (22).

5. The reverse penetration remote protection device according to claim 1, characterized in that: The distal end region of the elastic filter membrane (5) is formed as a continuous membrane-coated region without filter holes.

6. The reverse penetration remote protection device according to claim 1, characterized in that: The opening edge of the elastic filter membrane (5) is rolled and fixed to form a tubular edge (50), and the elastic support open loop (3) passes through the tubular edge (50).

7. The reverse penetration remote protection device according to claim 1, characterized in that: A distal support ring is also connected to the distal end of the support tube (2), and the elastic filter membrane (5) is connected to the surface of the distal support ring or supported on the outside of the distal support ring; A developing component is arranged on the distal support ring or a developing coating is coated on the distal support open ring.

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