CN114081663B - Filter weaving method, filter and embolic protector - Google Patents
Filter weaving method, filter and embolic protector Download PDFInfo
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- CN114081663B CN114081663B CN202111642317.1A CN202111642317A CN114081663B CN 114081663 B CN114081663 B CN 114081663B CN 202111642317 A CN202111642317 A CN 202111642317A CN 114081663 B CN114081663 B CN 114081663B
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- filter screen
- interwoven
- braiding
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000003073 embolic effect Effects 0.000 title claims abstract description 27
- 230000001012 protector Effects 0.000 title claims abstract description 27
- 238000009941 weaving Methods 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000004804 winding Methods 0.000 claims abstract description 17
- 238000009954 braiding Methods 0.000 claims description 52
- 238000007493 shaping process Methods 0.000 claims description 14
- 239000012781 shape memory material Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 238000002788 crimping Methods 0.000 claims 2
- 238000009940 knitting Methods 0.000 claims 1
- 238000004513 sizing Methods 0.000 claims 1
- 208000007536 Thrombosis Diseases 0.000 abstract description 34
- 210000004204 blood vessel Anatomy 0.000 abstract description 30
- 239000002245 particle Substances 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 230000002439 hemostatic effect Effects 0.000 description 4
- 230000017531 blood circulation Effects 0.000 description 3
- 208000006011 Stroke Diseases 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000925 Cd alloy Inorganic materials 0.000 description 1
- 206010061216 Infarction Diseases 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 description 1
- 210000000709 aorta Anatomy 0.000 description 1
- WJCRZORJJRCRAW-UHFFFAOYSA-N cadmium gold Chemical compound [Cd].[Au] WJCRZORJJRCRAW-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 239000002874 hemostatic agent Substances 0.000 description 1
- 230000007574 infarction Effects 0.000 description 1
- 229910001000 nickel titanium Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/01—Filters implantable into blood vessels
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
- D04C3/00—Braiding or lacing machines
- D04C3/40—Braiding or lacing machines for making tubular braids by circulating strand supplies around braiding centre at equal distances
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
- D04C3/00—Braiding or lacing machines
- D04C3/48—Auxiliary devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/01—Filters implantable into blood vessels
- A61F2002/016—Filters implantable into blood vessels made from wire-like elements
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Textile Engineering (AREA)
- Biomedical Technology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Cardiology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
本发明涉及一种滤网编织方法、滤网及栓塞保护器，包括编织：将基材编织为呈筒型的网状结构；收口：对所述网状结构的端部进行收口，将所述网状结构端部的每个交织点的两个交织线沿相互背离的方向绕接在定位结构的定位件上，直至同一交织点的两个交织线相互交织，本发明具有提高大端口面的径向支撑力，使大端口面和血管内壁之间减少缝隙的出现，从而使较小的血栓不会从大端口面和血栓壁之间的间隙中流出，从而提高了滤网收集血栓颗粒的能力，提高了栓塞保护器的使用的效果。
The present invention relates to a filter weaving method, a filter and an embolic protector, comprising weaving: weaving a base material into a cylindrical mesh structure; closing: closing the end of the mesh structure, winding two interlaced wires of each interlacing point at the end of the mesh structure around a positioning member of a positioning structure in directions diverging from each other, until the two interlaced wires at the same interlacing point are interlaced with each other. The present invention has the effect of improving the radial supporting force of the large port surface, reducing the appearance of gaps between the large port surface and the inner wall of the blood vessel, so that smaller thrombi will not flow out of the gap between the large port surface and the thrombus wall, thereby improving the ability of the filter to collect thrombus particles and improving the effect of the use of the embolic protector.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a filter screen braiding method, a filter screen and an embolic protector.
Background
The emboli are pieces of blood vessel that lodge in stenosed blood vessels and cause vessel blockage of distal parts of the body, for example, in valve repair or replacement procedures, manipulation of the calcified valve may cause movement of calcified material, tissue particles and other debris that may form pieces, thereby forming emboli that if in the heart or aorta, may cause infarction of any part of the body, embolic debris may migrate, through the circulatory system and cause vessel occlusion, blood clots and cerebrovascular accidents and strokes, one way to reduce these risks of complications is to provide a embolic protector downstream of the point of surgical treatment, capturing any emboli that may block the blood vessel, once captured, the embolic protector must be carefully closed and moved away from the patient's body, preventing the captured emboli from re-escaping into the blood vessel.
The embolic protector is to collect free thrombus particles by using a woven mesh, so that solid particles can be collected, blood flow can be allowed to pass through, but the large end face of the embolic protector is closed by only using a guide wire made of a memory material at present, the closing mode can collect the free thrombus particles, but the degree of adhesion between the large end face closing and a blood vessel wall is not high, small thrombus easily flows out from a gap between the large end face closing and the thrombus wall, so that the collection of the thrombus particles is influenced, and the using effect of the embolic protector is influenced.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems that the binding degree of the large-port closing opening and the vascular wall is not high, smaller thrombus flows out easily and the collection of thrombus particles is influenced, and provides a filter screen braiding method, a filter screen and an embolic protector.
A method for weaving a filter screen,
Comprising the following steps:
Braiding, namely braiding a base material into a cylindrical net structure;
And (3) closing up, namely closing up the end part of the mesh structure, and winding two interwoven wires of each interwoven point of the end part of the mesh structure on a positioning piece of the positioning structure along the direction deviating from each other until the two interwoven wires of the same interwoven point are interwoven with each other.
Further, in the closing step, the interwoven wires are wound and connected on a positioning piece of the positioning structure in an S-shaped winding mode.
Further, an included angle between the plane where the positioning structure is located and the axial direction of the mesh structure is set to be 20-80 degrees.
Further, the plane where the positioning structure is located is 45 degrees to the axial direction of the mesh structure.
Furthermore, the end part of the net structure is closed to be elliptical, and the positioning piece is a positioning rod.
Further, the method comprises the steps of,
After the closing-in step, further comprising:
and (3) shaping, namely heat-shaping and fixing the net-shaped structure.
Further, the method comprises the steps of,
After the closing-in step, further comprising:
Removing the locating structure from the end of the mesh structure.
Further, the substrate is composed of a shape memory material.
The filter screen is manufactured based on the filter screen braiding method.
An embolic protector includes the screen.
Further comprises:
the filter screen is connected to the distal end of the guide wire and is suitable for pushing the filter screen to leave the outer sheath tube and release and fit with the vessel wall;
and the filter screen and the guide wire are arranged in the outer sheath tube in a penetrating way.
Further comprises:
and the developing ring is arranged at the end part of the filter screen.
The technical scheme of the invention has the following advantages:
1. The invention provides a method for braiding a filter screen, which comprises braiding a base material into a cylindrical net structure; closing in: closing up the end part of the mesh structure, winding two interwoven wires of each interwoven point of the end part of the mesh structure on a positioning piece of the positioning structure along the direction deviating from each other until the two interwoven wires of the same interwoven point are interwoven with each other, braiding two groups of base materials along the opposite direction during braiding, braiding the base materials into a cylindrical mesh structure, unwinding the base materials braided at one end of the mesh structure, winding the two interwoven wires on the positioning piece of the positioning structure along the direction deviating from each other when each interwoven point of the mesh structure is unwound, winding the two interwoven wires on the positioning piece of the positioning structure until a circle of winding of the end part of the mesh structure is unwound, finishing closing up, fixing the whole filter screen, and winding the whole filter screen during the braiding process of the filter screen, the closing of the big port surface is realized by winding two interweaved lines of the unbuckled base material of the big port surface on the positioning piece along opposite directions, so that the interweaved lines of the unbuckled interweaved points of the net structure are mutually stacked and wound together, the base material stacked together forms the big port surface, the supporting force is provided by the stacked base material interweaved lines, the radial supporting force of the big port surface is improved, when the filter screen is sent into a blood vessel, the radial supporting force of the big port surface is improved, when the filter screen is unfolded, the fitting degree of the big port surface and the inner wall of the blood vessel is high, the gap between the big port surface and the inner wall of the blood vessel is reduced, so that smaller thrombus can not flow out from the gap between the big port surface and the thrombus wall, the capability of the filter screen for collecting thrombus particles is improved, the use effect of the embolic protector is improved.
2. According to the filter screen braiding method provided by the invention, in the closing step, the interweaved lines are wound in the S shape and are wound on the positioning piece of the positioning structure, and in the winding process, after two interweaved lines at one interweaved point are wound, the two interweaved lines are not easy to scatter from the positioning piece of the positioning structure, so that a worker can conveniently unwind the two interweaved lines at the next interweaved point, and then wind the two newly generated interweaved lines on the positioning piece of the positioning structure.
3. According to the method for braiding the filter screen, the included angle between the plane of the positioning structure and the axial direction of the mesh structure is set to be 20-80 degrees, and because the included angle exists between the plane of the positioning structure and the mesh structure, when the mesh structure is braided, the large port surface is closed, at the moment, the included angle between the large port surface and the axial direction of the mesh structure is consistent with the included angle between the large port surface and the positioning structure because of the included angle of the positioning structure, and the included angle between the large port surface of the filter screen and the axial direction of the filter screen is set to be 20-80 degrees, so that the large port surface of the filter screen can more easily pass through a bent blood vessel, and meanwhile, the large port surface of an inclined port is larger than the vertical area, so that the thrombus capturing capacity is stronger, the thrombus particle collecting capacity of the filter screen is improved, and the use effect of the embolic protector is improved.
4. According to the method for weaving the filter screen, the plane where the positioning structure is located and the axial direction of the mesh structure form an angle of 45 degrees, so that the plane where the large port surface of the woven filter screen is located and the axial direction of the filter screen form an angle of 45 degrees, the area of the large port surface is maximized, the thrombus capturing capacity is maximized, the thrombus particle collecting capacity of the filter screen is further improved, and the using effect of the embolic protector is improved.
5. According to the method for weaving the filter screen, the end portion of the net structure is closed to form an oval shape, the locating pieces are locating rods, and through the arrangement of the locating rods, two interwoven wires which are formed by the fact that the interweaving points of the filter screen are untwisted are respectively wound on the locating rods in the opposite directions for half a circle, the two interwoven wires which are untwisted by the interweaving points are wound, then the end portions are interweaved again, after all the interweaving points of one circle of the big end face are untwisted on the locating rods, the interwoven wires which are mutually stacked together are fixed through the hemostatic forceps, and shaping is carried out.
6. The method for weaving the filter screen, provided by the invention, further comprises the steps of shaping after the step of closing up, fixing the mesh structure by heat shaping, after weaving the mesh structure and winding two interweaved wires separated by a circle of unbuckled interweaved points on the large port surface on the positioning structure, fixing the interweaved wires mutually stacked together by using a hemostatic forceps, and sending the whole filter screen into a heat shaping machine together, and performing heat shaping on the large port surface of the mesh structure mutually stacked together, so that the interweaved wires mutually stacked together are fixed and cannot scatter, the interweaved wires mutually stacked together provide larger radial supporting force, the degree of fit between the large port closing up edge and the blood vessel wall after the filter screen is unfolded is high, the collection capacity of thrombus particles is improved, and the use effect of the embolic protector is improved.
7. According to the method for weaving the filter screen, the base material is made of the shape memory material, and the filter screen made of the shape memory material can be better adapted to the inner wall shapes of different blood vessels, so that the adherence is better.
8. The embolic protector provided by the invention comprises a filter screen and a guide wire, wherein the filter screen is connected to the distal end of the guide wire and is suitable for pushing the filter screen to leave the outer sheath tube and release and attach with the wall of a blood vessel; the filter screen and the guide wire are arranged in the outer sheath tube in a penetrating mode, when the filter screen is used, the woven filter screen is contracted in the outer sheath tube, during operation, the outer pin tube is inserted into a blood vessel with thrombus in a human body together with the filter screen, after the filter screen is pushed to the downstream of an operation position, the guide wire is pushed again, the filter screen is withdrawn from the outer sheath tube, at the moment, after the filter screen leaves the constraint of the outer sheath tube, the filter screen can automatically recover to an original funnel shape due to the shape memory of a woven base material, at the moment, the big port closing-up of the filter screen can be close to the inner wall of the blood vessel, the big port closing-up is formed through base material interweaved lines stacked together, supporting force is provided through the stacked base material interweaved lines, accordingly, radial supporting force of the big port face is improved, when the filter screen is unfolded, the attaching degree of the big port face and the inner wall of the blood vessel is high, gaps are reduced between the big port face and the inner wall of the blood vessel, accordingly small thrombus cannot flow out from gaps between the big port face and the wall of the blood vessel, the filter screen can be recovered to the original funnel shape due to the shape memory of the filter screen, at the moment, the big port closing-up of the filter screen can be pulled into the inner side of the filter screen, the thrombus can be recovered from the filter screen after the filter screen is taken out from the outer sheath, and the thrombus can be collected from the inside the blood vessel along with the thrombus, and the blood flow after the blood circulation can be collected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a step diagram of a method of braiding a filter screen according to the present invention;
FIG. 2 is a schematic view of a metal rod according to the present invention;
FIG. 3 is a schematic view of the structure of the present invention during the wrapping process;
FIG. 4 is a schematic view of the structure of the present invention when wound around a neck;
fig. 5 is a schematic view of the structure of the embolic protector of the present invention.
Reference numerals illustrate:
1. a filter screen; 2, a guide wire, 3, an outer sheath tube, 4, a developing ring, 5, a metal rod and 6, a positioning hole.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the following description, the apparatus is used with the side closer to the operator being the proximal end and the side farther from the operator being the distal end.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
Referring to fig. 1 to 5, the present invention provides a method for braiding a filter screen, comprising the steps of:
S1, braiding, namely braiding a base material into a cylindrical net structure;
the base material is made of braided wires made of shape memory materials, and the specific braided wires can be made of nickel titanium, titanium alloy, gold-cadmium alloy or copper-zinc alloy, and the filter screen 1 made of the shape memory materials can be better adapted to the inner wall shapes of different blood vessels, so that the adherence is better.
In the braiding step of the step S1, braiding staff carries out braiding on a stainless steel solid metal rod 5 with the outer diameter of 6mm, and the braiding method is formed by braiding 48-spindle braiding wires in a one-by-one braiding mode, when braiding, the braiding wires 24 are in one group, two groups of braiding wires are braided in opposite directions, two groups of braiding wires are lapped together to form interweaving points, when any one group of braiding wires is braided, the braiding wires are lapped on the other group of braiding wires in an S-shaped mode, and the radial supporting force of the braided net structure is high in a one-by-one mode, so that the braided net structure has better adherence. The outer diameter size of the braided wire was set to 0.04mm.
Specifically, taking one of the braiding wires as an example, when one end of the braiding wire is braided in the direction of the other group of 24-pin braiding wires, the braiding wire is respectively overlapped with the other group of 24-spindle braiding wires, when the braiding wires are overlapped, two interweaving points are connected, the part of the braiding wire positioned at one interweaving point is contacted with the metal rod, and the part of the braiding wire at the other interweaving point is contacted with the part of the braiding wire at the other end, which is opposite to the metal rod, so that the braiding of the braiding wire is completed.
In alternative embodiments, a S-wrap placement may also be employed to achieve a mesh structure woven into a cylinder.
The metal rod 5 is provided with a locating hole 6 which surrounds the length 2mm of the circumference of the metal rod 5 and has the diameter of 0.3mm from the 80mm of the head, the locating structure is arranged in the locating hole 6, the included angle between the plane where the locating holes 6 are arranged and the axial direction of the metal rod 5 is 20 to 80 degrees, so that the included angle between the plane where the locating structure is arranged and the axial direction of the net structure is also 20 to 80 degrees, and the included angle exists between the plane where the locating structure is arranged and the net structure.
The specific included angle between the plane where the plurality of positioning holes 6 are located and the axial direction of the metal rod 5 is set to be 45 degrees, so that the included angle between the plane where the positioning structure is located and the axial direction of the net structure is also 45 degrees, the area of the large port surface is maximized, the capability of capturing thrombus is maximized, the capability of collecting thrombus particles of the filter screen 1 is further improved, and the using effect of the embolic protector is improved.
S2, closing up, namely closing up the end part of the mesh structure, and winding two interwoven wires of each interwoven point of the end part of the mesh structure on a positioning piece of the positioning structure along the direction deviating from each other until the two interwoven wires of the same interwoven point are interwoven with each other.
In the step of closing up S2, the end of the reticular structure is closed up in an oval shape, the interweaved wires are wound in an S shape and are wound on the positioning piece of the positioning structure, the S shape is wound on the positioning piece of the positioning structure, after two interweaved wires at one interweaved point are wound in the winding process, the two interweaved wires are not easy to scatter from the positioning piece of the positioning structure, so that a worker can conveniently unwind the two interweaved wires at the next interweaved point, and then wind the two newly generated interweaved wires on the positioning piece of the positioning structure.
In this embodiment, the positioning structure includes a plurality of positioning holes 6 formed in the metal rod, the positioning members are 24 positioning rods, and the outer diameter of the positioning rods is 0.3mm. Specifically, in the present embodiment, 24 positioning holes 6, B1, B2, and..b23 and B24 are provided, the positioning holes being used for inserting the positioning rod. Correspondingly, the locating stick is provided with 24, is C1, C2...C23 and C24 in proper order, wherein, C1 is pegged graft on B1, and C2 is pegged graft on B2..C23 is pegged graft on B23, and C24 is pegged graft on B24.
The positioning rods are arranged around the periphery of the reticular structure, after the reticular structure is woven on the metal rod 5, when the big port face is closed, the woven mesh at the end, which is the end, of the positioning hole 6, which is 80mm long away from the head of the metal rod 5, is unwound, when the woven mesh is unwound, two interwoven wires which appear when the woven mesh is unwound at the interweaving points are respectively wound on the positioning rods in half circles along opposite directions, so that the two interwoven wires which are unwound at the interweaving points are wound well and then the ends meet again, after all the interweaving points of the big port face are wound on the positioning rods, the interwoven wires which are mutually stacked together through hemostatic forceps are fixed, and the shaping is performed.
As shown in fig. 3 and 4, taking one of the interleaving points as an example:
Two interlaced wires are started to appear at the A1 interlacing point, namely A11 and A12, wherein A11 winds clockwise from C1 to B2 and B3, and A12 winds anticlockwise from B1 to B24 and B23;
when a11 is wound, it is first wound on C2 in the distal direction of a11 to B2, then a11 is wound on C3. in the proximal direction of B3, a11 is wound on C11 in the distal direction of B11, and finally a11 is wound on C12 in the distal direction of B12.
When a12 is wound, it is first wound on C24 in the distal direction of a12 to B24, then a12 is wound on C23 in the proximal direction of B23.
Then, A11 and A12 interweave each other at the distal end side of C12 to fix the coincidence of two interweaving lines through hemostat, other 23 interweaving points are consistent with the interweaving point winding mode, and the interweaving lines that all interweaving points are untied are all wound on the positioning rod.
S3, shaping, namely heat-shaping and fixing the net-shaped structure;
In the shaping step of S3, after the reticular structure is woven, and two interweaved wires separated by one circle of unbuckled interweaved points are wound on the positioning rod, the interweaved wires stacked together are fixed by the hemostatic forceps, the whole filter screen 1 is fed into a heat setting machine together, the reticular structure and the large port surfaces stacked together are heat set, so that the interweaved wires stacked together are fixed and cannot scatter, the interweaved wires stacked together provide larger radial supporting force, the degree of fit between the closing edge of the large port and the blood vessel wall is high after the filter screen 1 is unfolded after the filter screen 1 enters the blood vessel, the collection capacity of thrombus particles is improved, and the use effect of the embolic protector is improved.
And S4, detaching the positioning piece from the end part of the net structure.
In the method for braiding the filter screen provided by the embodiment, during braiding, two groups of base materials are braided in opposite directions in a one-to-one braiding mode, the base materials are braided into a cylindrical net structure, one end of the net structure is defined as a big port surface, the braided base materials at the big port surface are unwound, at the moment, when each interweaving point of the net structure is unwound, two interweaving wires appear, at the moment, the interweaving wires of the two interweaving wires are wound on a positioning piece of the positioning structure along the direction deviating from each other, until the big port surface is unwound and wound on the positioning piece of the positioning structure, the closing-up of the big port surface is completed, the big port surface of the filter screen 1 is molded, then the whole filter screen 1 is fixed, during the braiding process of the filter screen 1, the closing-up of the big port surface is wound on the positioning piece along opposite directions by winding the two interweaving wires of the unwound base materials of the big port surface, thereby make the interweaving of mesh structure round interweave the point and unbuckled interweave the line and all pile up and establish together, thereby form big port face through the substrate interweaving that stacks together this moment, provide holding power through the substrate interweaving that stacks, thereby improve the radial holding power of big port face, when sending filter screen 1 into the blood vessel, because the radial holding power of big port face improves, thereby when making filter screen 1 expand, the laminating degree of big port face and blood vessel inner wall is high, reduce the appearance of gap between big port face and the blood vessel inner wall, thereby make less thrombus can not follow in the clearance between big port face and the thrombus wall, thereby improve filter screen 1 and collected the ability of thrombus granule, the result of use of embolic protector has been improved.
Example 2
As shown in fig. 1-5, the invention provides an embolic protector, which comprises a filter screen 1 manufactured by the method for weaving the filter screen, wherein both ends of the filter screen 1 are provided with developing rings 4, the embolic protector further comprises a guide wire 2 and an outer sheath tube 3, the filter screen 1 is connected to the distal end of the guide wire 2 and is suitable for pushing the filter screen 1 to leave the outer sheath tube 3 and release and attach to the vessel wall, and the filter screen 1 and the guide wire 2 are arranged in the outer sheath tube 3 in a penetrating way.
When in use, the woven filter screen 1 is contracted in the outer sheath tube 3, during operation, the outer pin tube is inserted into a blood vessel with thrombus in a human body together with the filter screen 1, after being pushed to the downstream of an operation part, the guide wire 2 is pushed again, the filter screen 1 is withdrawn from the outer sheath tube 3, at this moment, after the filter screen 1 leaves the restraint of the outer sheath tube 3, the filter screen 1 can automatically recover to an original funnel shape due to the shape memory property of woven base materials, at this moment, the big port closing-up of the filter screen 1 can be close to the inner wall of the blood vessel, as the big port closing-up is formed by the base material interweaved wires stacked together, the supporting force is provided by the stacked base material interweaved wires, so that the radial supporting force of the big port face is improved, when the filter screen 1 is unfolded, the degree of the laminating of the big port face and the inner wall of the blood vessel is high, gaps between the big port face and the inner wall of the blood vessel are reduced, so that smaller thrombus can not flow out from gaps between the big port face and the thrombus wall at this moment, the capability of the filter screen 1 for collecting thrombus particles is improved, the use effect of a protector is improved, the big port closing-up of the filter screen 1 can be retracted into the filter screen 1 from the inner side of the filter screen 1 along with the inner wall 3 of the blood vessel, and the thrombus particles can be withdrawn from the filter screen 1 after the filter screen 1 is completely taken out from the filter screen 1.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (11)
1. A method of braiding a filter screen, comprising:
Braiding, namely braiding a base material into a cylindrical net structure;
Closing up, namely closing up the end part of the mesh structure, winding two interwoven wires of each interwoven point at the end part of the mesh structure on positioning pieces of the positioning structure along the direction deviating from each other until the two interwoven wires of the same interwoven point are interwoven with each other, specifically winding the two interwoven wires which are generated when the interwoven points of the filter screen are unwound on a plurality of positioning pieces along the opposite directions respectively, interweaving the end parts again after the two interwoven wires which are unwound at the interwoven points are wound well, and fixing the interwoven wires which are mutually stacked together after all the interwoven points of one circle of big port surfaces are unwound on the positioning pieces for shaping;
the included angle between the plane where the positioning structure is located and the axial direction of the net structure is set to be 20-80 degrees.
2. The method of claim 1, wherein in the step of crimping, the interlaced wire is wound in an S-wrap around a retainer of a retaining structure.
3. The method of claim 1, wherein the plane of the positioning structure is 45 degrees from the axial direction of the mesh structure.
4. The method of claim 1, wherein the end portion of the mesh structure is closed in an oval shape, and the positioning member is a positioning rod.
5. The method of braiding a filter screen according to any of claims 1-4, further comprising, after the step of crimping:
and (3) shaping, namely heat-shaping and fixing the net-shaped structure.
6. The method of knitting a screen as in claim 5 further comprising, after the step of sizing:
Removing the locating structure from the end of the mesh structure.
7. The method of braiding a filter screen of claim 1, wherein the substrate is comprised of a shape memory material.
8. A screen manufactured by the screen weaving method according to any one of claims 1 to 4 and 6 to 7.
9. An embolic protector comprising the filter screen of claim 8.
10. The embolic protector of claim 9, further comprising:
the filter screen is connected to the distal end of the guide wire and is suitable for pushing the filter screen to leave the outer sheath tube and release and fit with the vessel wall;
and the filter screen and the guide wire are arranged in the outer sheath tube in a penetrating way.
11. The embolic protector of claim 9, further comprising:
and the developing ring is arranged at the end part of the filter screen.
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| CN202111642317.1A CN114081663B (en) | 2021-12-29 | 2021-12-29 | Filter weaving method, filter and embolic protector |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101912289A (en) * | 2010-08-25 | 2010-12-15 | 成正辉 | Thrombus excider and preparation method and use method thereof |
| CN102413781A (en) * | 2009-02-26 | 2012-04-11 | 德普伊国际有限公司 | Support structure implant for a bone cavity |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201798779U (en) * | 2010-08-25 | 2011-04-20 | 成正辉 | Thrombus remover |
| CN104068909A (en) * | 2013-03-26 | 2014-10-01 | 上海微创医疗器械（集团）有限公司 | Intracranial vascular thrombus retrieval machine and thrombus retrieval device |
| US9700332B2 (en) * | 2015-10-23 | 2017-07-11 | Inari Medical, Inc. | Intravascular treatment of vascular occlusion and associated devices, systems, and methods |
| CN210962104U (en) * | 2019-09-11 | 2020-07-10 | 武汉唯柯医疗科技有限公司 | Atrium shunting pressure reduction device and atrium shunting pressure reduction device using and compiling device |
| CN111839806A (en) * | 2020-07-31 | 2020-10-30 | 上海心玮医疗科技有限公司 | High-compliance plug protector and filter screen manufacturing method thereof |
| CN212426368U (en) * | 2020-09-22 | 2021-01-29 | 威海文华服饰有限公司 | A knitting device for clothing decoration |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102413781A (en) * | 2009-02-26 | 2012-04-11 | 德普伊国际有限公司 | Support structure implant for a bone cavity |
| CN101912289A (en) * | 2010-08-25 | 2010-12-15 | 成正辉 | Thrombus excider and preparation method and use method thereof |
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