CN213940889U - Double-layer filter screen anti-embolism far-end protection device - Google Patents

Abstract

The utility model belongs to the technical field of medical instrument, a double-deck filter screen anti embolism distal end protection device is related to, including elasticity bed frame, first filter screen and second filter screen. The both ends of first filter screen are first open end and first blind end respectively, and the distance of first blind end and elasticity bed frame is greater than the distance of first open end and elasticity bed frame, and just first open end is connected with the elasticity bed frame, and it has a plurality of first filtration pores to distribute on the first filter screen. A plurality of second filter holes are distributed on the second filter screen. The second filter screen is connected with the elastic base frame, and the second filter screen suit is outside elastic base frame and first filter screen for anti embolism distal end protection device of double-deck filter screen is in the use, and blood crosses elastic base frame, first opening end, first filtration hole and second filtration hole in proper order, and the low reaches of flow direction blood vessel. Through setting up first filter screen and second filter screen, and the second filter screen suit is outside first filter screen to can form double-deck filtration, can effectively filter thrombus or plaque, prevent thrombus or plaque flow direction blood vessel's low reaches.

Description

Double-layer filter screen anti-embolism far-end protection device

Technical Field

The utility model belongs to the technical field of medical instrument, concretely relates to anti embolism distal end protection device of double-deck filter screen.

Background

With the improvement of living standard, the life of people in China is greatly prolonged, the aging degree is increased, and the incidence rate of ischemic stroke is higher and higher, so that the cerebral arterial thrombosis is one of the main diseases damaging the lives of middle-aged and elderly people in China. Wherein the atherosclerotic carotid artery stenosis accounts for about 20% -30% of ischemic stroke.

The intervention treatment of carotid artery stenosis is an important measure for preventing ischemic stroke. The common and conventional means is to perform surgical procedures for treating carotid stenosis, such as carotid artery dissection, balloon dilatation, incision and thrombectomy, and carotid artery stenting. Because of its characteristics of small surgical trauma, low anesthesia risk, few contraindications and complications, etc., it gradually becomes the main treatment mode of carotid stenosis. However, in the course of the above-mentioned operation, a thrombus or plaque may be detached, and the detached thrombus or plaque may flow downstream of the blood vessel with the blood flow, thereby causing intracranial cerebral embolism and causing acute ischemic stroke.

In the prior art, a single-layer filtering structure is generally adopted to filter thrombus or plaque to prevent the thrombus or plaque from flowing downstream, but once too much thrombus or plaque or large thrombus or plaque appears, the blood flow is easily blocked.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an anti embolism distal end protection device of double-deck filter screen, it can improve the effect of filtering thrombus or plaque.

To achieve the purpose, the utility model adopts the following technical proposal:

a dual screen anti-embolic distal protection device comprising:

an elastic base frame;

the distance between the first closed end and the elastic base frame is greater than that between the first open end and the elastic base frame, the first open end is connected with the elastic base frame, and a plurality of first filtering holes are distributed in the first filter screen;

the second filter screen is provided with a plurality of second filter holes; the second filter screen with the elasticity bed frame is connected, just the second filter screen suit is in outside the elasticity bed frame with first filter screen, makes the anti embolism distal end protection device of double-deck filter screen is in the use, and blood passes through in proper order the elasticity bed frame first opening end first cross the filtration hole with the second crosses the filtration hole, flows to vascular low reaches.

Preferably, in the above double-layer filter screen anti-embolism distal end protection device, the second filter screen is arranged at a distance from the first filter screen.

Preferably, in the above double-layer filter screen anti-embolism distal end protection device, the pore area of the first filtering pores decreases in sequence in the direction from the first open end to the first closed end.

Preferably, in the above double-layer filter screen anti-embolism distal end protection device, the first filter screen is of a conical structure, and the diameter of the first filter screen gradually decreases in a direction from the first open end to the first closed end.

Preferably, in the above double-layer filter screen anti-embolism distal end protection device, the pore area of the second filter hole is smaller than the pore area of the first filter hole.

Preferably, in the anti-embolism distal end protection device with a double-layer filter screen, the second filter screen includes a filter section, the second filter holes are distributed in the filter section, the filter section is of a conical structure, and the diameter of the filter section is gradually reduced in a direction away from the elastic base frame.

Preferably, in the above-mentioned double-layer filter screen anti-embolism distal end protection device, the filter section is sleeved on the first filter screen, and an opening of the filter section is flush with the first open end.

Preferably, in the above double-layer filter screen anti-embolism distal end protection device, the second filter screen includes a filter section and an installation section that are connected, the installation section is a cylindrical structure, and the installation section is sleeved and connected on the outer surface of the elastic base frame.

Preferably, in the above double-layer filter screen anti-embolism distal end protection device, the elastic base frame includes an abutting portion, an outer wall of the abutting portion protrudes toward an inner wall of the blood vessel, and the mounting section is sleeved on a periphery of the abutting portion and is attached to the abutting portion.

Preferably, in the above double-layer filter screen anti-embolism distal end protection device, the double-layer filter screen anti-embolism distal end protection device further comprises a guide wire, and the guide wire is connected with one end of the elastic base frame.

Preferably, in the above double-layer filter screen anti-embolism distal end protection device, the first filter screen is a metal filter screen and/or the second filter screen is a polymer filter screen.

Preferably, in the above double-layer filter screen anti-embolism distal end protection device, the first filter screen is a nickel-titanium alloy filter screen or a cobalt-chromium alloy filter screen or a stainless steel filter screen.

The utility model discloses an anti embolism distal end protection device of double-deck filter screen's beneficial effect lies in: through setting up first filter screen and second filter screen, and the second filter screen suit is outside first filter screen to can form double-deck filtration, can effectively filter thrombus or plaque, prevent thrombus or plaque flow direction blood vessel's low reaches.

Drawings

Fig. 1 is a schematic view of a dual screen anti-embolism distal protection device according to an embodiment of the present invention;

fig. 2 is a schematic view of a double-layer filter screen anti-embolism distal protection device according to an embodiment of the present invention in a use state;

fig. 3 is a schematic view of the connection between the flexible base frame and the first screen of the dual-screen anti-embolism distal protection device according to the embodiment of the present invention;

fig. 4 is a schematic diagram of a second screen of a dual-screen anti-embolism distal protection device according to an embodiment of the present invention.

The component names and designations in the drawings are as follows:

a dual screen anti-embolic distal protection device 100, a flexible base frame 10, an abutment 11, a bunched end 12, a first screen 20, a first open end 21, a first closed end 22, a second screen 30, a second open end 31, a second closed end 32, a filter segment 33, a mounting segment 34, a large thrombus or plaque 51, a small thrombus or plaque 52.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

For convenience of description, the present embodiment defines upstream and downstream with respect to the direction of flow of blood in a blood vessel, the blood flowing from upstream to downstream.

Fig. 1 is a schematic view of a dual screen anti-embolism distal protection device 100 according to an embodiment of the present invention. Fig. 2 is a schematic view of a dual-layer screen anti-embolism distal protection apparatus 100 according to an embodiment of the present invention in a use state. As shown in fig. 1 and 2, the present embodiment discloses a dual screen anti-embolic distal protection device 100. The dual screen anti-embolic distal protection device 100 comprises a resilient base 10, a first screen 20 and a second screen 30. The flexible base frame 10 may be formed by a plurality of flexible rods that are alternately arranged and hinged to each other so as to be able to expand and contract, wherein the flexible base frame 10 has a gathered end 12 formed at one end facing the upstream, and an open end formed at the other end after the flexible base frame 10 is expanded. The resilient base frame 10 expands and contracts from the gathered end 12.

After the double-layer filter screen anti-embolism distal protection device 100 reaches a preset target position in an access mode, the double-layer filter screen anti-embolism distal protection device 100 is released, the elastic base frame 10 can expand due to the elasticity of the elastic base frame 10 to be attached and anchored on the inner wall of a blood vessel, and a radial supporting force is formed between the blood vessel and the elastic base frame 10, so that the elastic base frame 10 is limited by the blood vessel, and the elastic base frame 10 is positioned at a preset position on the upstream of the blood vessel. The diameter of the blood vessel released by the elastic pedestal 10 is slightly smaller than the diameter of the blood vessel in a natural state without being bound by external force, so that the resilience force of the elastic pedestal 10 to the blood vessel wall is limited, the force required by anchoring right can be met, and the blood vessel is not damaged.

The two ends of the first filter screen 20 are respectively a first open end 21 and a first closed end 22, the distance between the first closed end 22 and the elastic base frame 10 is greater than the distance between the first open end 21 and the elastic base frame 10, the first open end 21 is connected with the elastic base frame 10, and a plurality of first filter holes are distributed on the first filter screen 20. A plurality of second filtering holes are distributed on the second filtering net 30. The second filter screen 30 is connected to the elastic base frame 10, and the second filter screen 30 is sleeved outside the elastic base frame 10 and the first filter screen 20, so that in the use process of the double-layer anti-embolism distal protection device 100, blood flows to the downstream of the blood vessel through the elastic base frame 10, the first open end 21, the first filtering hole and the second filtering hole in sequence.

The double-layer filter screen anti-embolism distal protection device 100 of the embodiment is provided with the first filter screen 20 and the second filter screen 30, and the second filter screen 30 is sleeved outside the first filter screen 20, so that double-layer filtering can be formed, thrombus or plaque can be effectively filtered, and the thrombus or plaque is prevented from flowing to the downstream of a blood vessel.

Specifically, the first screen 20 and the second screen 30 of the present embodiment may be respectively connected to the flexible base frame 10 by means of bonding, heat fusing, welding, or sewing.

The first screen 20 of the present embodiment may be a polymer mesh structure. The first screen 20 has a stiffness such that its morphology and mesh size are not susceptible to change during blood flow and under the influence of thrombus or plaque. The diameter of the first filtering holes of the first filter 20 is 500 to 1200 μm, preferably 500 to 600 μm. For example, the diameter of the first filtering holes is 500 μm or 600 μm or 1200 μm. The first screen 20 of the present embodiment may be woven from elastic metal wires or polymer wires to form a mesh structure.

The diameter of the second filtering holes of the second filter 30 is 70 to 150 μm, preferably 80 to 120 μm. For example, the diameter of the second filtering holes is 70 μm or 80 μm or 120 μm or 150 μm. Likewise, second screen 30 has a stiffness that is not susceptible to changes in morphology and mesh size during blood flow and under the influence of thrombus or plaque. Second screen 30 may be woven from elastic metal wires or polymer wires to form a mesh structure.

The flexible base 10 has a suitable resilience such that the flexible base 10 can be contracted and carry the first and second screens 20 and 30 together when the double screen anti-embolic distal protection device 100 is retrieved. That is, the diameter of the elastic base frame 10 with elasticity is reduced and compressed, the first filter screen 20 and the second filter screen 30 attached to the elastic base frame 10 are reduced together, and in the using process, the double-layer filter screen anti-embolism distal protection device 100 is compressed to the minimum state in the diameter, enters a blood vessel and is released after reaching a predetermined position, and then is unfolded, so that the diameter of the elastic base frame 10 is rebounded to be equivalent to the diameter of the blood vessel, and the adherence is realized.

First and second screens 20, 30 of the present application also open during deployment of elastomeric base frame 10 to function as a filter for thrombus or plaque. The pore diameters of the first filtering pore and the second filtering pore mentioned below are both referred to as the expanded pore diameter. The configurations of the flexible base frame 10, first screen 20, and second screen 30 of the present application are all referred to as expanded configurations.

Preferably, second screen 30 is spaced apart from first screen 20, and first screen 20 and second screen 30 are spaced apart from each other after being opened and not contacting each other. First screen 20 and second screen 30 of the present embodiment are spaced apart at least at the location where filtration actually occurs. The filter screens are arranged in double layers and at intervals, and the filter holes of the two filter screens have different apertures, so that thrombi or plaques with different sizes can be filtered respectively, and the thrombi or plaques can be distributed in the axial direction of the anti-embolism distal end protection device 100 with the double layers of filter screens, and can not be accumulated. The device is beneficial to ensuring the normal passage of blood and is not easy to generate the phenomena of blood blockage, perfusion or turbulence. While also facilitating the eventual recovery of the dual screen anti-embolism distal protection device 100. If a large particle thrombus or plaque is encountered and captured by the first screen 20, the first screen 20 may cut the large thrombus or plaque into small pieces under the influence of the blood flow impact power, and the small pieces of thrombus or plaque are eventually captured by the second screen 30.

For the filter screen with one layer of structure, the captured thrombus or plaque is accumulated on the filter screen with the one layer, and the condition of accumulation of the thrombus or plaque is easily caused in the operation process, so that the normal circulation of blood is influenced. In addition, thrombus or plaque is accumulated on one layer of filter screen, resulting in an excessively large local radial diameter, and a situation in which recovery is difficult is likely to occur when the double-layer filter screen anti-embolism distal end protection device 100 is recovered after the end of the operation. Therefore, the present embodiment provides the double-layer filter screens at intervals, so that the thrombus or plaque is dispersed along the running direction of the blood vessel, and the local radial diameter is not too large, thereby easily recovering the double-layer filter screen anti-embolism distal protection device 100.

Fig. 3 is a schematic diagram of the connection between the flexible base frame 10 and the first screen 20 of the dual-screen anti-embolism distal protection apparatus 100 according to the embodiment of the present invention. As shown in fig. 1 and 3, the first filter holes preferably have a decreasing hole area in the direction from the first open end 21 to the first closed end 22, which is advantageous for increasing the filtering effect of the first filter 20 on thrombus or plaque.

Preferably, the first screen 20 has a conical structure, and the diameter of the first screen 20 gradually decreases from the first open end 21 to the first closed end 22, which is beneficial to improve the thrombus or plaque filtering effect of the first screen 20.

Preferably, the aperture area of the second filtering aperture is smaller than the aperture area of the first filtering aperture. In the present embodiment, large thrombus or plaque 51 is first filtered by first screen 20, and small thrombus or plaque 52 passes through the first filtering holes and enters the space between first screen 20 and second screen 30, and is filtered by the second filtering holes of second screen 30 and stays in the space between first screen 20 and second screen 30. The embodiment filters thrombus or plaque layer by layer in turn, and the filtering effect is good.

Fig. 4 is a schematic diagram of a second screen 30 of a dual screen anti-embolism distal protection device 100 according to an embodiment of the invention. As shown in fig. 1 and 4, preferably, the second filter screen 30 includes a filter section 33, the second filter holes are distributed in the filter section 33, the filter section 33 is of a conical structure, and the diameter of the filter section 33 is gradually reduced in a direction away from the elastic base frame 10, which is beneficial to improving the effect of the second filter screen 30 in filtering thrombus or plaque.

Preferably, the filter segment 33 is sleeved on the first filter mesh 20, and the opening of the filter segment 33 is flush with the first open end 21, so that the first filter mesh 20 and the second filter mesh 30 of the present embodiment filter simultaneously, and the first filter mesh 20 filters large thrombus or plaque 51, and the second filter mesh 30 filters small thrombus or plaque 52, and the filtering is more sufficient. The opening of the filter segment 33 here refers to the opening of the end of the filter segment 33 facing upstream. The other end of filter segment 33 opposite the opening forms a second closed end 32 of the entire second screen 30.

As shown in fig. 2 and 4, preferably, the second filter 30 includes a filter segment 33 and a mounting segment 34 connected to each other, the mounting segment 34 is a cylindrical structure, and the mounting segment 34 is sleeved on and connected to an outer surface of the elastic base frame 10. The structure of the mounting section 34 of this embodiment facilitates the connection between the second filter screen 30 and the flexible base frame 10, and allows the second filter screen 30 to be easily sleeved outside the first filter screen 20. The upstream end of mounting section 34 forms second open end 31 of the entire second screen 30.

As shown in fig. 1, 2 and 4, preferably, the elastic base frame 10 includes an abutting portion 11, an outer wall of the abutting portion 11 is raised toward an inner wall of the blood vessel, and the mounting section 34 is sleeved on a periphery of the abutting portion 11 and is attached to the abutting portion 11. The installation section 34 is arranged between the abutting part 11 of the elastic pedestal 10 and the inner wall of the blood vessel, and the outer surface of the installation section 34 is closer to the local structure of the blood vessel, thereby being more beneficial to protecting the blood vessel. The mounting section 34 of the present embodiment also has a certain elasticity, and the abutting portion 11, in combination with the mounting section 34, can better abut against the blood vessel to be positioned at a predetermined position, and will not move during the operation.

Preferably, the dual screen anti-embolic distal protection device 100 further comprises a guide wire 40, the guide wire 40 being connected to one end of the resilient base frame 10. Specifically, a guidewire 40 is attached to the bunched end 12.

The guide wire 40 is used to deliver the double screen anti-embolic distal protection device 100 to a predetermined vascular site, for example, to deliver the double screen anti-embolic distal protection device 100 to a target lesion site, and as a guide wire, a catheter, an angiographic catheter, a balloon, an embolectomy device, a suction catheter, a stent transporter, a retrieval catheter, and the like for subsequent interventional procedures. The guide wire 40 may be made of biocompatible metal or polymer material, for example, metal such as nickel-titanium alloy, stainless steel or cobalt-chromium alloy, or polymer material such as nylon, PI or PET, and the outer diameter of the guide wire 40 is generally between 0.010Inch and 0.038Inch, preferably 0.014 Inch.

In the process of recovering the dual-layer screen anti-embolism distal protection device 100, the elastic base frame 10, the first screen 20 and the second screen 30 may be deformed due to being folded, which may cause turbulence, whirling or disorder of blood flow, and the structure of the first screen 20 and the second screen 30 of this embodiment may make thrombus or plaque that has been caught less likely to be separated from the dual-layer screen anti-embolism distal protection device 100 in the process of recovering the dual-layer screen anti-embolism distal protection device 100.

In other embodiments, first screen 20 and second screen 30 may also be in the shape of a windsock.

Preferably, when the first screen 20 is a metal screen, for example, the first screen 20 is a nickel-titanium alloy screen or a cobalt-chromium alloy screen or a stainless steel screen, it is convenient to connect with the elastic base frame 10 made of metal, for example, it can be integrally formed with the elastic base frame 10.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (12)

1. A dual screen anti-embolism distal protection device, comprising:

an elastic base frame (10);

the filter screen comprises a first filter screen (20), wherein a first open end (21) and a first closed end (22) are respectively arranged at two ends of the first filter screen (20), the distance between the first closed end (22) and the elastic base frame (10) is greater than the distance between the first open end (21) and the elastic base frame (10), the first open end (21) is connected with the elastic base frame (10), and a plurality of first filter holes are distributed in the first filter screen (20);

the second filter screen (30), distribute several second to filter the hole on the said second filter screen (30); the second filter screen (30) is connected with the elastic base frame (10), and the second filter screen (30) is sleeved outside the elastic base frame (10) and the first filter screen (20), so that in the using process of the double-layer anti-embolism distal protection device, blood sequentially passes through the elastic base frame (10), the first open end (21), the first filtering hole and the second filtering hole and flows to the downstream of a blood vessel.

2. The dual screen anti-embolic distal protection device of claim 1, wherein the second screen (30) is spaced apart from the first screen (20).

3. The double screen anti-embolic distal protection device of claim 1, wherein the first filter holes decrease in pore area sequentially in the direction from the first open end (21) to the first closed end (22).

4. Double screen anti-embolism distal protection according to claim 3, wherein said first screen (20) is of conical configuration and wherein the diameter of said first screen (20) decreases in the direction from said first open end (21) to said first closed end (22).

5. The dual screen anti-embolic distal protection device of any of claims 1-4, wherein the second filter aperture has a smaller aperture area than the first filter aperture.

6. Double screen anti-embolism distal protection according to claim 5, wherein the second screen (30) comprises a filter section (33), wherein the second filter holes are distributed in the filter section (33), wherein the filter section (33) has a cone-like structure, and wherein the diameter of the filter section (33) decreases in a direction away from the resilient base frame (10).

7. Double screen anti-embolism distal protection according to claim 6, wherein said filter section (33) is nested on said first screen (20) and the opening of said filter section (33) is flush with said first open end (21).

8. The double screen anti-embolic distal protection device of claim 1, wherein the second screen (30) comprises a filtering section (33) and a mounting section (34) connected, the mounting section (34) is a cylindrical structure, and the mounting section (34) is sleeved and connected on the outer surface of the elastic base frame (10).

9. The double-deck screen anti-embolic distal protection device of claim 8, wherein the resilient base frame (10) comprises an abutment portion (11), an outer wall of the abutment portion (11) bulges towards an inner wall of the blood vessel, and the mounting section (34) is sleeved on a periphery of the abutment portion (11) and is attached to the abutment portion (11).

10. The double screen anti-embolic distal protection device of claim 1, further comprising a guide wire (40), the guide wire (40) being connected to one end of the resilient base frame (10).

11. Double screen anti-embolisation distal end protection device according to claim 1, wherein the first screen (20) is a metal screen and/or the second screen (30) is a polymeric screen.

12. The double screen anti-embolisation distal end protection device of claim 11, wherein the first screen (20) is a nickel titanium alloy screen or a cobalt chromium alloy screen or a stainless steel screen.

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