CN114081663A - Filter mesh weaving method, filter mesh and embolic protector - Google Patents
Filter mesh weaving method, filter mesh and embolic protector Download PDFInfo
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- CN114081663A CN114081663A CN202111642317.1A CN202111642317A CN114081663A CN 114081663 A CN114081663 A CN 114081663A CN 202111642317 A CN202111642317 A CN 202111642317A CN 114081663 A CN114081663 A CN 114081663A
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- 238000009941 weaving Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000001012 protector Effects 0.000 title claims abstract description 27
- 230000003073 embolic effect Effects 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000004804 winding Methods 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 claims description 11
- 239000012781 shape memory material Substances 0.000 claims description 6
- 238000009998 heat setting Methods 0.000 claims description 3
- 238000002788 crimping Methods 0.000 claims 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 208000007536 Thrombosis Diseases 0.000 abstract description 33
- 210000004204 blood vessel Anatomy 0.000 abstract description 22
- 208000005189 Embolism Diseases 0.000 abstract description 16
- 239000002245 particle Substances 0.000 abstract description 9
- 238000009940 knitting Methods 0.000 description 23
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 239000008187 granular material Substances 0.000 description 9
- 230000017531 blood circulation Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 230000002439 hemostatic effect Effects 0.000 description 4
- 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
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000925 Cd alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 206010053648 Vascular occlusion Diseases 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
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002874 hemostatic agent Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 229910001000 nickel titanium Inorganic materials 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000002966 stenotic effect Effects 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
- 208000021331 vascular occlusion disease Diseases 0.000 description 1
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- 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
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- 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 invention relates to a filter mesh weaving method, a filter mesh and an embolism protector, comprising: weaving: weaving a base material into a cylindrical mesh structure; closing: closing the ends of the mesh structure, The two interweaving lines of each interweaving point at the end of the mesh structure are wound on the positioning member of the positioning structure in the direction away from each other until the two interweaving lines of the same interweaving point are interwoven with each other. The radial support force reduces 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. ability to improve the effectiveness of the use of embolic protectors.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a filter screen weaving method, a filter screen and an embolism protector.
Background
Emboli are intravascular masses that lodge in stenotic vessels causing blockage of the vessel at distal body parts, such as in valve repair or replacement procedures, manipulation of calcified valves can result in migration of calcified material, tissue particles and other debris, which can potentially form clumps, thereby forming an embolism which, if located in the heart or aorta, may cause an occlusion in any part of the body, embolic debris may migrate, one way to reduce the risk of these complications, through the circulatory system and resulting in vascular occlusion, blood clots and cerebrovascular accidents, and stroke, is to place an embolic protector downstream of the surgical treatment site, capturing any emboli that may occlude the vessel, once captured, the embolic protector must be carefully closed and removed from the patient's body, avoiding the captured emboli from being reissued into the vessel.
The embolism protector utilizes the mesh grid to collect free thrombus granule, can collect solid particle, also can allow the blood flow to pass through, but present embolism protector's big terminal surface binding off only uses the seal wire that comprises memory material to close up, and this binding off mode can be collected free thrombus granule, but the laminating degree of big port binding off and vascular wall is not high, and less thrombus flows out from the clearance between big port binding off and the thrombus wall easily, influences the collection of thrombus granule, influences embolism protector's result of use.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems that the joint degree of a large-port closed opening and a blood vessel wall is not high, smaller thrombus is easy to flow out, and collection of thrombus particles is influenced, so that a filter screen weaving method, a filter screen and an embolism protector are provided.
A method for weaving a filter screen,
the method comprises the following steps:
weaving: weaving the base material into a cylindrical net structure;
closing: closing up the end part of the net-shaped structure, and connecting the two interwoven lines of each interwoven point of the end part of the net-shaped structure on a positioning piece of the positioning structure in a winding way along the direction of mutual deviation until the two interwoven lines of the same interwoven point are interwoven.
Further, in the closing step, the interweaving line is wound and connected to a positioning piece of the positioning structure in an S-shaped manner.
Further, the included angle between the plane of the positioning structure and the axial direction of the net-shaped structure is set to be 20-80 degrees.
Furthermore, the plane of the positioning structure is 45 degrees with the axial direction of the net-shaped structure.
Furthermore, the end part of the net-shaped structure is closed in an oval shape, and the positioning piece is a positioning rod.
Further, in the above-mentioned case,
after the closing step, the method further comprises the following steps:
and (4) shaping, namely heat-setting and fixing the net-shaped structure.
Further, in the above-mentioned case,
after the closing step, the method further comprises the following steps:
dismantling: removing the locating structure from the end of the mesh structure.
Further, the substrate is composed of a shape memory material.
A filter screen is manufactured based on the filter screen weaving method.
An embolic protector comprising the filter screen.
Further comprising:
the filter screen is connected to the far end of the guide wire and is suitable for pushing the filter screen to leave the outer sheath tube and release the filter screen to be attached to the vessel wall;
the filter screen and the guide wire are arranged in the outer sheath tube in a penetrating way.
Further comprising:
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 filter screen weaving method, which comprises the following steps: weaving the base material into a cylindrical net structure; closing: closing up the end part of the mesh structure, winding and connecting two interwoven threads of each interwoven point of the end part of the mesh structure on a positioning part of a positioning structure along the direction deviating from each other until the two interwoven threads of the same interwoven point are interwoven with each other, weaving two groups of base materials along opposite directions during weaving, weaving the base materials into a cylindrical mesh structure, untying the base materials woven at one end of the mesh structure, untying each interwoven point of the mesh structure, generating two interwoven threads, winding and arranging the two interwoven threads on the positioning part of the positioning structure along the direction deviating from each other until one circle of the end part of the mesh structure is untwisted and arranged on the positioning part of the positioning structure, completing closing up, then fixing the whole filter screen, and winding up the large port surface on the positioning part along opposite directions by winding the two interwoven threads of the base materials of the circle of the large port surface on the positioning part during weaving of the filter screen, thereby the interweaving line that the interweaving point of messenger's network structure round was untied all piles up each other and is twined together, thereby form big port face through the substrate that piles up together this moment, provide the holding power through the substrate interweaving line that piles up, thereby the radial holding power of big port face has been improved, when sending into the filter screen to the blood vessel, because the radial holding power of big port face improves, thereby when making the filter screen expand, the laminating degree of big port face and blood vessel inner wall is high, make the appearance that reduces the gap between big port face and the blood vessel inner wall, thereby make less thrombus can not flow out from the clearance between big port face and the thrombus wall, thereby improved the ability that the filter screen collected the thrombus granule, improved embolic protector's result of use.
2. In the closing-up step, the interweaving lines are wound and connected on the positioning piece of the positioning structure in an S shape, and in the winding process, after two interweaving lines at one interweaving point are wound, the two interweaving lines are not easy to scatter from the positioning piece of the positioning structure, so that a worker can conveniently unwind the two interweaving lines at the next interweaving point and then wind the two newly generated interweaving lines on the positioning piece of the positioning structure.
3. According to the filter screen weaving method provided by the invention, the included angle between the plane of the positioning structure and the axial direction of the net-shaped structure is set to be 20-80 degrees, the included angle exists between the plane of the positioning structure and the net-shaped structure, when the net-shaped structure is woven and the large port surface is closed, the included angle between the large port surface and the axial direction of the net-shaped structure is consistent with the included angle of the positioning structure due to the arrangement of the included angle of the positioning structure, 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 the oblique port is larger than the vertical area, so that the capability of capturing thrombus is stronger, the capability of the filter screen for collecting thrombus particles is improved, and the use effect of the embolic protector is improved.
4. According to the filter screen weaving method provided by the invention, the plane of the positioning structure and the axial direction of the net-shaped structure form an angle of 45 degrees, so that the plane of the large port surface of the woven filter screen 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 embolism protector is improved.
5. According to the filter screen weaving method provided by the invention, the end part of the net-shaped structure is in an oval shape, the positioning piece is the positioning rod, and through the arrangement of the positioning rod, when the large port surface is closed, two interwoven threads formed by untwisting the interwoven points of the filter screen are respectively wound on the positioning rods for half a circle along opposite directions, so that the two interwoven threads with untwisted points are twined and then are interwoven again at the end part, after all one circle of interwoven points of the large port surface are untwisted on the positioning rod, the interwoven threads which are mutually stacked together are fixed through hemostatic forceps, and shaping is carried out.
6. The invention provides a filter screen weaving method, which comprises the following steps of after the closing step, shaping, heat-shaping and fixing the mesh structure, after the mesh structure is woven and two separated interwoven threads with untwisted interweaving points of a circle of a large port surface are wound on a positioning structure, fixing the interwoven threads which are mutually stacked together by using a hemostatic forceps, feeding the whole filter screen into the heat-shaping machine together, and carrying out heat-shaping on the large port surface of the mesh structure which is mutually stacked together, so that the interwoven threads which are mutually stacked together are fixed and cannot be scattered, the interwoven threads which are mutually stacked together provide larger radial supporting force, after the filter screen enters a blood vessel, the joint degree between the large port closing edge and the blood vessel wall is high after the filter screen is unfolded, the collection capacity of thrombus particles is improved, and the use effect of the embolism protector is improved.
7. According to the filter screen weaving method provided by the invention, the base material is made of the shape memory material, and the filter screen made of the shape memory material can better adapt to the inner wall shapes of different blood vessels and has better adherence.
8. The embolism 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 the filter screen to be attached to the vessel wall; the outer sheath tube, the said filter screen and guide wire are through the outer sheath tube, when using, the braided filter screen is contracted in the outer sheath tube, when operating, the outer pin tube and the filter screen are inserted into the blood vessel with thrombus, after being pushed to the downstream of the operation part, the guide wire is pushed to withdraw the filter screen from the outer sheath tube, at this time, after the filter screen leaves the outer sheath tube, the filter screen will automatically return to the original shape funnel shape due to the shape memory of the braided base material, at this time, the big end opening closing up of the filter screen will be close to the inner wall of the blood vessel, because the big end opening closing up is formed by the overlapped base material interweaving line, the support force is provided by the overlapped base material interweaving line, thereby improving the radial support force of the big end opening, when the filter screen is unfolded, the fit degree of the big end opening and the inner wall of the blood vessel is high, the gap between the big end opening and the inner wall of the blood vessel is reduced, thereby make less thrombus can not flow from the clearance between big port face and the thrombus wall to improved the ability that the thrombus granule was collected to the filter screen, improved embolism protector's result of use, the blood flow that comes this moment can flow into in the filter screen, and the blood flow passes through in the filter screen, and the thrombus granule is collected in the filter screen, and after the collection finishes, the filter screen is retracted once more and is taken out from the human body along with outer sheath pipe.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a step diagram of a method of weaving a screen according to the present invention;
FIG. 2 is a schematic view of the structure of a metal bar according to the present invention;
FIG. 3 is a schematic view of the wound closure of the present invention;
FIG. 4 is a schematic view of the wound closure of the present invention;
fig. 5 is a schematic structural view of the embolic protector of the present invention.
Description of reference numerals:
1. filtering with a screen; 2. a guide wire; 3. an outer sheath tube; 4. a developing ring; 5. a metal rod; 6. and (7) positioning the holes.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being 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," "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, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the following description, the side of the apparatus closer to the operator in use is referred to as the proximal end, and the side farther from the operator is referred to as the distal end.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
Referring to fig. 1 to 5, the present invention provides a method for weaving a filter screen, including the steps of:
s1: weaving: weaving the base material into a cylindrical net structure;
the base material is formed by weaving wires made of shape memory materials, the specific weaving 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 better adapt to the inner wall shapes of different blood vessels and has better adherence.
In the knitting step of the step S1, knitting personnel knit on a stainless steel solid metal rod 5 with the outer diameter of 6mm and knit 48 spindles of knitting wires in a one-to-one knitting mode, during knitting, the knitting wires 24 spindles form one group, two groups of knitting wires knit in opposite directions, every two groups of knitting wires are lapped together to form an interlacing point, during knitting of one knitting wire of any group, the knitting wires are firstly lapped on the other group of knitting wires in an S shape, and through the one-to-one mode, the radial supporting force of the knitted reticular structure is large, so that the knitted reticular structure has better adherence. The outer diameter of the braided wire was set to 0.04 mm.
Specifically, taking one of the knitting yarns as an example, what is called "lapping-on-lapping" is to lap the knitting yarn with another set of 24-spindle knitting yarns respectively when one end of the knitting yarn is knitted toward the other set of 24-spindle knitting yarns, and connect two interlacing points when lapping-on-lapping is performed, wherein the part of the knitting yarn at one of the interlacing points is contacted with the metal rod, and the part of the knitting yarn at the other interlacing point is contacted with the part of the knitting yarn at the other end, which is opposite to the metal rod, so as to complete knitting of the knitting yarn.
In an alternative embodiment, the weaving into a cylindrical mesh structure can also be realized by the S-shaped winding arrangement.
The metal rod 5 is provided with a positioning hole 6 which is 2mm long and has a diameter of 0.3mm along a circle at a position 80mm away from the head part and surrounds the metal rod 5, the positioning structure is arranged in the positioning hole 6, and an included angle between the plane where the positioning holes 6 are located and the axial direction of the metal rod 5 is set to be 20 degrees to 80 degrees, so that the included angle between the plane where the positioning structure is located and the axial direction of the mesh structure is also 20 degrees to 80 degrees, because the plane where the positioning structure is located and the mesh structure have an included angle, when the mesh structure is woven, the closing-in of the large port surface is carried out, at the moment, because of the arrangement of the included angle of the positioning structure, the included angle between the large port surface and the axial direction of the mesh structure is also consistent with the included angle of the positioning structure, because the included angle between the large port surface of the filter screen 1 and the axial direction of the filter screen 1 is set to be 20 degrees to 80 degrees, so that the large port surface of the filter screen 1 can more easily pass through a bent blood vessel, meanwhile, the large port face of the oblique port is larger than the vertical area, so that the thrombus catching capacity is higher, the thrombus particle collecting capacity of the filter screen 1 is improved, and the using effect of the embolism protector is improved.
The specific included angle that 6 planes of a plurality of locating holes and the axis direction of metal bar 5 on sets up to 45 degrees to make location structure place plane with the upward included angle of network structure's axial direction also is 45 degrees, thereby makes the area of big port face reach the biggest, thereby reaches the biggest to the ability performance of catching the thrombus, further improvement filter screen 1 collect the ability of thrombus granule, improved embolism protector's result of use.
S2: closing: closing up the end part of the net-shaped structure, and connecting the two interwoven lines of each interwoven point of the end part of the net-shaped structure on a positioning piece of the positioning structure in a winding way along the direction of mutual deviation until the two interwoven lines of the same interwoven point are interwoven.
In the close-up step of S2, the tip binding off of network structure is oval, the interweaving line becomes the winding of S type and connects on location structure 'S setting element, winds through above-mentioned S type and establishes on location structure' S setting element, makes around the in-process of establishing, winds after establishing two interweaving lines of an interlace department, and two interweaving lines are difficult for scattering from location structure 'S setting element to make things convenient for the staff to untie behind two interweaving lines of next interlace department, and twine two interweaving lines that newly produce on location structure' S setting element again.
Specifically, in this embodiment, the positioning structure includes a plurality of positioning holes 6 disposed on the metal rod, the positioning members are 24 positioning rods, and the outer diameter of each positioning rod is 0.3 mm. Specifically, in the present embodiment, 24 positioning holes 6, B1, B2, … B23 and B24 are provided, and the positioning holes are used for inserting the positioning rods. Correspondingly, the number of the positioning rods is 24, namely C1, C2 … C23 and C24, wherein C1 is plugged on B1, C2 is plugged on B2, … C23 is plugged on B23, and C24 is plugged on B24.
A plurality of location stick encircle network structure week along setting, after weaving out network structure on metal rod 5, when closing up big port face, untie the woven mesh of 6 distance metal rod 5 head distance 80mm long this end department of locating hole this moment, when untiing, the woven mesh interlacing point unties two interwoven lines that appear and twines the half circle on a plurality of location sticks along opposite direction respectively, the tip once more meets after two interwoven lines that make the interlacing point untie, all big port face round interweave after all untie the winding on the location stick, it fixes mutually pile together interwoven line through hemostatic forceps, finalize the design.
As shown in fig. 3 and 4, taking one of the interleaving points as an example:
two interweaving lines start to appear at the interweaving point of A1: a11 and A12, A11 winds from C1 to the clockwise direction of B2 and B3, A12 winds from B1 to the counterclockwise direction of B24 and B23;
when A11 is wound, firstly, A11 is wound on C2 in the distal direction of B2, then A11 is wound on C3 … … A11 in the proximal direction of B3 in the distal direction of B11 in C11, and finally A11 is wound on C12 in the distal direction of B12.
When A12 is wound, firstly, A12 is wound on C24 in the distal direction of B24, then A12 is wound on C23 … … A12 in the proximal direction of B23 in the distal direction of B13 in C13, and finally A12 is wound on C12 in the distal direction of B12.
Then, a11 and a12 interweave with each other at the far end side of C12, and the overlapping part of two interweaving lines is fixed by a hemostat, and the other 23 interweaving points are wound in the same way with the interweaving points until all the interweaving lines which are unwound from the interweaving points are wound on the positioning rod.
S3: shaping: heat-setting and fixing the net-shaped structure;
in the shaping step of S3, after the net-shaped structure is woven and the two interweaving lines with separated interweaving points and untwisted in a circle on the large port face are wound on the positioning rod, the interweaving lines which are stacked together are fixed by hemostatic forceps, the whole filter screen 1 is sent into the heat shaping machine together, the large port face with the net-shaped structure stacked together is subjected to heat shaping, so that the interweaving lines which are stacked together are fixed and cannot be scattered, the interweaving lines which are stacked together provide larger radial supporting force, after the filter screen 1 enters the blood vessel, the attaching degree between the large port closing edge and the blood vessel wall is high after the filter screen 1 is unfolded, the collection capacity of thrombus particles is improved, and the using effect of the embolic protector is improved.
S4: dismantling: removing the locating member from the end of the mesh structure.
The method for knitting the filter screen provided by this embodiment weaves two groups of base materials in opposite directions by a one-to-one weaving mode to weave the base materials into a cylindrical mesh structure, at this time, one end of the mesh structure is defined as a large port surface, the woven base materials at the large port surface are untied, when each interweaving point of the mesh structure is untied, two interweaving lines appear, at this time, the interweaving lines of the two interweaving lines are wound on the positioning piece of the positioning structure along the directions deviating from each other until one circle of the large port surface is untied and wound on the positioning piece of the positioning structure, completing the closing of the large port surface, forming the large port surface of the filter screen 1, then fixing the whole filter screen 1, during the weaving process of the filter screen 1, the closing of the large port surface is realized by winding the two interweaving lines of the base materials untied one circle of the large port surface on the positioning piece along opposite directions, therefore, interweaving lines with one circle of interweaving points of the net-shaped structure are stacked and twined together, the large port face is formed by the overlapped substrate interweaving lines, supporting force is provided by the stacked substrate interweaving lines, and the radial supporting force of the large port face is improved.
Example 2
As shown in fig. 1-5, the invention provides an embolism protector, which comprises a filter screen 1 manufactured by the above-mentioned filter screen weaving method, developing rings 4 arranged at both ends of the filter screen 1, a guide wire 2 and an outer sheath tube 3, wherein 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 to be attached to the blood vessel wall; 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, when in operation, the outer pin tube and the filter screen 1 are inserted into a blood vessel with thrombus in the human body together, and are pushed to the downstream of the operation part, then the guide wire 2 is pushed, the filter screen 1 is withdrawn from the outer sheath tube 3, at the moment, after the filter screen 1 leaves the restriction of the outer sheath tube 3, the filter screen 1 can automatically return to the funnel shape due to the shape memory of the woven base material, at the moment, the large port closing-up of the filter screen 1 can be pressed close to the inner wall of the blood vessel, because the large port closing-up is a large port surface formed by the overlapped base material interweaving lines, the supporting force is provided by the overlapped base material interweaving lines, thereby the radial supporting force of the large port surface is improved, when the filter screen 1 is unfolded, the attaching degree of the large port surface and the inner wall of the blood vessel is high, and the gap between the large port surface and the inner wall of the blood vessel is reduced, thereby make less thrombus can not flow out from the clearance between big port face and the thrombus wall to improved filter screen 1 and collected the ability of thrombus granule, improved embolism protector's result of use, the blood flow that comes this moment can flow into in filter screen 1, the blood flow passes through in the filter screen 1, the thrombus granule is collected in filter screen 1, after the collection finishes, in filter screen 1 retracts to sheath pipe 3 once more, takes out from the human body along with sheath pipe 3 together.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (12)
1. A method of weaving a filter screen, comprising:
weaving: weaving the base material into a cylindrical net structure;
closing: closing up the end part of the net-shaped structure, and connecting the two interwoven lines of each interwoven point of the end part of the net-shaped structure on a positioning piece of the positioning structure in a winding way along the direction of mutual deviation until the two interwoven lines of the same interwoven point are interwoven.
2. The method of claim 1, wherein the interweaving lines are wrapped around the positioning members of the positioning structure in an S-shaped manner during the crimping step.
3. The method of weaving a screen according to claim 1, wherein the plane of the positioning structure is arranged at an angle of 20-80 degrees to the axial direction of the mesh structure.
4. The method of weaving a screen according to claim 1, wherein the plane of the locating formation is at 45 degrees to the axial direction of the mesh.
5. The method of claim 1, wherein the net structure has an oval end and the positioning element is a positioning rod.
6. The method of weaving a screen according to any of claims 1 to 5, further comprising, after the crimping step:
and (4) shaping, namely heat-setting and fixing the net-shaped structure.
7. The method of weaving a screen according to claim 6, further comprising, after the crimping step:
dismantling: removing the locating structure from the end of the mesh structure.
8. The method of weaving a screen according to claim 1, wherein the base material is composed of a shape memory material.
9. A filter screen produced by the method of weaving a filter screen according to any one of claims 1 to 5 and 7 to 8.
10. An embolic protector, characterized by comprising the screen (1) of claim 9.
11. The embolic protector of claim 10, further comprising:
the filter screen (1) is connected to the far end of the guide wire (2) and is suitable for pushing the filter screen (1) to leave the outer sheath tube (3) and release the filter screen to be attached to the vessel wall;
the outer sheath pipe (3), filter screen (1) and seal wire (2) wear to establish in outer sheath pipe (3).
12. The embolic protector of claim 10, further comprising:
and the developing ring (4) is arranged at the end part of the filter screen (1).
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| CN114081663B (en) | 2024-12-31 |
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