CN115886936A - Bolt taking system - Google Patents

Bolt taking system Download PDF

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Publication number
CN115886936A
CN115886936A CN202211544074.2A CN202211544074A CN115886936A CN 115886936 A CN115886936 A CN 115886936A CN 202211544074 A CN202211544074 A CN 202211544074A CN 115886936 A CN115886936 A CN 115886936A
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CN
China
Prior art keywords
connecting ring
guide
embolectomy
thrombus
ring
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Pending
Application number
CN202211544074.2A
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Chinese (zh)
Inventor
李爽
郭力友
夏洁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Zhongtian Medical Device Technology Co ltd
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Suzhou Zhongtian Medical Device Technology Co ltd
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Application filed by Suzhou Zhongtian Medical Device Technology Co ltd filed Critical Suzhou Zhongtian Medical Device Technology Co ltd
Priority to CN202211544074.2A priority Critical patent/CN115886936A/en
Publication of CN115886936A publication Critical patent/CN115886936A/en
Pending legal-status Critical Current

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B17/221Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B2017/22001Angioplasty, e.g. PCTA
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B2017/22038Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with a guide wire
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B2017/22079Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with suction of debris
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B2017/22094Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for for crossing total occlusions, i.e. piercing

Abstract

The invention provides a embolectomy system, which relates to the technical field of medical instruments and comprises a embolectomy device and a far-end protection device; the thrombus taking device comprises a thrombus taking module and a guide piece extending along the length direction of a blood vessel, the thrombus taking module comprises a thrombus taking support and a first connecting ring, the thrombus taking support is sleeved on the guide piece, the thrombus taking support comprises a support catching net and a support converging end which are connected end to end, the support converging end is fixedly connected with the first connecting ring, and the guide piece is sleeved with the first connecting ring; the far-end protection device comprises a device framework, a knitting wire and a third connecting ring which are connected end to end, the guiding piece is sleeved with the device framework, the knitting wire is wound on one end of the device framework and is drawn in the third connecting ring, the guiding piece is sleeved with the third connecting ring, and an opening of the far-end protection device is opposite to an opening of the bolt taking support. The system realizes structural improvement through the split design of the bolt taking device and the far-end protection device, improves the working flexibility and provides convenience for bolt taking operation.

Description

Bolt taking system
The application is a divisional application of a patent application named as 'a thrombus extraction system and a thrombus extraction method', the application date of the original application is number 07, 13 in 2022, and the application number is 202210818077.4.
Technical Field
The invention relates to the technical field of medical instruments, in particular to a thrombus taking system.
Background
Pulmonary artery embolism is a potential life-threatening disease, acute pulmonary artery embolism can cause systemic hypotension and even whole heart failure, and further causes death of patients, and is one of three fatal cardiovascular diseases which are parallel to myocardial infarction and stroke. The most common embolus in pulmonary embolism is thrombus. At present, common treatment modes mainly comprise treatment operation modes such as pulmonary endarterectomy, thrombus suction, catheter thrombolysis, mechanical thrombus extraction and the like. Among them, mechanical thrombus removal mainly removes thrombus by crushing, suction, stent or basket thrombus removal, and has become a focus of research in recent years. The mechanical thrombus removal technology comprises the steps of expanding a stent, then embedding the stent with thrombus, dragging the thrombus into an aspiration catheter, and aspirating the thrombus out of a body by using an aspiration device.
However, the current thrombus removal device is mainly used for embedding the thrombus through the stent so as to take the stent and the thrombus into the catheter and remove the stent and the thrombus out of the body. However, in the process of bolt removal, the difficulty of the bolt removal process is increased due to the fact that the position between the bolt removal device and the far-end protection device is difficult to adjust, and the efficiency of the bolt removal operation is reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a bolt taking system, so that the working flexibility of the bolt taking system is improved, and convenience is provided for bolt taking operation.
In order to achieve the purpose, the invention provides the following scheme:
an embolectomy system capable of being placed within a blood vessel (910), comprising:
the thrombus taking device (100) comprises a guide piece, a thrombus taking module, a pushing rod (400), a guide catheter (500) and a thrombus absorbing catheter (600), wherein the pushing rod (400), the guide catheter and the thrombus absorbing catheter are sequentially sleeved from inside to outside, the guide piece extends along the length direction of a blood vessel (910), the thrombus taking module comprises a thrombus taking support (110) and a first connecting ring (140), the thrombus taking support (110) is sleeved on the guide piece, the thrombus taking support (110) comprises a support catching net (112) and a support beam-receiving end (113) which are connected end to end, the support beam-receiving end (113) is fixedly connected to the first connecting ring (140), and the first connecting ring (140) is sleeved on the guide piece;
the far-end protection device (200) comprises a device framework (210), a braided wire (220) and a third connecting ring (230) which are connected end to end, the device framework (210) is sleeved on the guide piece, the braided wire (220) is wound on one end of the device framework (210), the braided wire (220) is collected on the third connecting ring (230), the third connecting ring (230) is sleeved on the guide piece, and an opening of the far-end protection device (200) is opposite to an opening of the thrombus taking support (110);
the thrombus removing device (100) and the far-end protecting device (200) can be retracted in the guide catheter (500), one end of the guide piece, which is far away from the far-end protecting device (200), is fixedly connected with the push rod (400), and the thrombus absorbing catheter (600) is used for recovering the thrombus (920), the far-end protecting device (200) and the thrombus removing device (100); the guide piece comprises an inner tube (120) and a guide wire (300), the guide wire (300) penetrates through the inner tube (120), the first connecting ring (140) is sleeved on the inner tube (120), and the guide wire (300) penetrates through the third connecting ring (230) and is connected with the far-end protection device (200); the guide piece comprises an inner rod (150) and a guide wire (300), the guide wire (300) penetrates through the inner rod (150), and the first connecting ring (140) and the third connecting ring (230) are sleeved on the inner rod (150).
Preferably, a first connecting ring (140) and an associated bolt holder (110) are provided as a bolt group, at least one of which is provided.
Preferably, the stent catching net (112) forms a parallelogram grid which is spirally distributed around the axis of the guide, and the stent catching net (112) can drive the first connecting ring (140) to rotate around the axis of the guide.
Preferably, two bolt taking groups are provided, and the parallelogram grids on the two bolt taking brackets (110) are in opposite spiral directions around the axis of the guide piece, so that the rotation directions of the two bolt taking groups are opposite; two bolt groups are arranged at intervals along the extending direction of the guide piece, and two adjacent bolt groups can have partial area overlapping.
Preferably, the ratio of the length of the long side to the length of the short side of the parallelogram mesh is within 1.5-3.
Preferably, the peripheral wall of the guide part is convexly provided with a limit bulge, and when the bolt taking bracket (110) displaces relative to the guide part, the first connecting ring (140) is stopped by the first connecting ring (140) and abuts against the limit bulge.
Preferably, the limiting protrusion is a spherical member.
Preferably, the device framework (210) comprises a framework connecting rod (211) and a framework weaving part (212) arranged on one side of the framework connecting rod (211), the framework weaving part (212) forms framework holes (214), the framework holes (214) are uniformly distributed at intervals around the axis of the guide piece, weaving holes (213) penetrate through the framework weaving part (212), and a plurality of weaving holes (213) are uniformly distributed at intervals around the framework holes (214); each weaving wire (220) passes through one weaving hole (213), and two ends of each weaving wire are fixedly connected to the third connecting ring (230); a framework connecting head (215) is arranged on the other side of the framework connecting rod (211), the framework connecting head (215) is fixedly connected to a fourth connecting ring (240), and the fourth connecting ring (240) is sleeved on the guide piece; a part of the skeleton-woven part (212) forming the skeleton holes (214) evenly distributed at intervals around the axis of the guide is divided into a woven frame, and the third connecting ring (230) connected with the woven frame through the woven wires (220), the woven wires (220) connected with the woven frame and the woven frame form a storage net bag; accomodate the string bag and be equipped with at least one, the latter accomodate the string bag weave the coaxial rigid coupling of frame in the former accomodate the string bag weave the frame and keep away from the one end of thrombectomy device (100).
Preferably, the third connection ring (230) comprises a second inner ring (231) and a second outer ring (232) coaxially sleeved on the second inner ring (231), and the second inner ring (231) and the second outer ring (232) form a containing cavity; both ends of the knitting silk (220) are threaded in the accommodating cavity.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention can collect the dropped and broken embolus scraps by the remote protection device and take out the embolus scraps out of the body, thereby preventing the downstream blood vessel from being blocked. The filter screen sets up can realize effectively the action of catching the embolus, twines the zonulae occludens that can realize filter screen and device skeleton in the design of device skeleton through weaving the silk, has reduced the risk of distal end protection device damage, weaves the silk and draws in the design of third go-between and make the filter screen mesh narrow gradually from the embolus near-end to embolus distal end, has realized the optimization to the filter screen effect of catching from this. The design that the far-end protection device is right opposite to the opening of the embolectomy support can surround emboli from two sides, and therefore the risk that the emboli is separated from the embolectomy system is greatly reduced. The bolt taking device and the far-end protection device are arranged in a split manner, so that the bolt taking operation process of the bolt taking system is improved, the complex bolt taking working environment can be met, the working flexibility can be greatly improved, and the bolt taking operation efficiency can be improved; through the design that the guide piece is sleeved with the third connecting ring, the far-end protection device and the bolt taking device can be quickly positioned, and the bolt taking operation can be smoothly and accurately finished due to the design of a split structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a thrombus removal system according to an embodiment of the present invention;
FIG. 2 is a partially expanded view of an embolectomy support device provided by an embodiment of the invention;
FIG. 3 is a schematic structural diagram of another embolectomy module provided by the embodiments of the present invention;
FIG. 4 is a schematic structural view of another thrombectomy support according to the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a remote protection device provided in an embodiment of the present invention;
FIG. 6 is a partially expanded view of a device skeleton according to an embodiment of the present invention;
FIG. 7 is a partial expanded view of a carcass woven portion and a woven filament provided in accordance with an embodiment of the present invention;
FIG. 8 is a partially expanded view of another alternative thrombectomy stent provided in accordance with embodiments of the present invention;
FIG. 9 is a schematic structural view of a device skeleton and a braiding mandrel provided in accordance with an embodiment of the present invention;
FIG. 10 is a cross-sectional view of a first connecting ring provided by an embodiment of the present invention;
FIG. 11 is a cross-sectional view of a first coupling ring provided in accordance with an embodiment of the present invention;
FIG. 12 is a cross-sectional view of a third connector ring provided in accordance with an embodiment of the present invention;
FIG. 13 is a partial cross-sectional view of a tether system provided by an embodiment of the present invention;
FIG. 14 is a first cross-sectional view of a blood vessel, an embolus, and an embolectomy system provided by embodiments of the present invention;
FIG. 15 is a second cross-sectional view of a blood vessel, an embolus, and an embolectomy system provided in accordance with an embodiment of the present invention;
FIG. 16 is a schematic structural diagram of another embolectomy system provided by an embodiment of the invention.
Description of reference numerals: 100. a thrombus taking device; 110. a thrombus taking support; 111. a stent extension end; 112. a support is used for catching the net; 113. a support binding end; 114. a bracket connector; 120. an inner tube; 121. an inner pipe convex ring; 130. opening an end socket; 140. a first connecting ring; 141. a first inner ring; 142. a middle ring; 143. a first outer ring; 144. inserting grooves; 150. an inner rod; 160. the end of the inner rod; 170. a second connection ring; 200. a distal protection device; 210. a device skeleton; 211. a framework connecting rod; 212. a skeleton-knitted portion; 213. weaving holes; 214. a skeleton hole; 215. a framework connector; 220. weaving silk; 230. a third connecting ring; 231. a second inner ring; 232. a second outer ring; 240. a fourth connecting ring; 300. a guide wire; 400. a push rod; 500. a guide catheter; 600. a thrombus-aspiration catheter; 800. weaving a mandrel; 910. a blood vessel; 920. an embolus; 921. embolic debris.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
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, removably 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different elements and not for describing a particular sequential order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, the inclusion of a list of steps, processes, methods, etc. is not limited to only those steps recited, but may alternatively include additional steps not recited, or may alternatively include additional steps inherent to such processes, methods, articles, or devices.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, 2, 14 and 15, the present embodiment provides an embolectomy device 100, which can be placed in a blood vessel 910, and comprises a guide member and an embolectomy module; the guide extends along the length of vessel 910; the bolt taking module comprises a bolt taking support 110 and a first connecting ring 140, the bolt taking support 110 is sleeved on the guide piece, the bolt taking support 110 comprises a support extending end 111, a support catching net 112 and a support converging end 113 which are connected end to end, the support converging end 113 is fixedly connected to the first connecting ring 140, and the first connecting ring 140 is sleeved on the guide piece; the support catching net 112 forms a parallelogram grid which is spirally distributed around the axis of the guide, and the support catching net 112 can drive the first connecting ring 140 to rotate around the axis of the guide.
By means of the design of the parallelogram grids on the embolectomy support 110, the embolectomy device 100 can avoid the obstruction of the blood vessel 910 to the support catching net 112 in a rotating mode in the process of withdrawing the embolectomy device 100, and further realize the self-adaptive rotation of the embolectomy support 110 around the axis of the guide piece, so that the catching capacity of embolus 920 is enhanced, the condition that the embolus 920 falls off in the process of withdrawing is avoided, and the efficiency of embolectomy operation is improved. Meanwhile, the structural improvement enables the thrombus extraction stent 110 to have excellent flexibility and torque failure resistance, has good wall-adhering capability in a bent blood vessel 910, and can adapt to blood vessels 910 with different shapes; when resistance is met during retraction, the thrombus extraction stent 110 can also generate self-adaptive rotation, so that the resistance is automatically avoided, and the damage to the blood vessel 910 is reduced. The structure has the advantages of high thrombus removal efficiency, no damage to the blood vessel 910, easy development improvement and capability of preventing the embolus 920 from falling off.
In this embodiment, the extending end 111 of the bracket is a rod-shaped member, and one end is fixed to the bracket catching net 112; the frame extension end 111 is provided with at least one, and the developing property of the thrombectomy frame 110 can be enhanced by fixing the developing material (developing ring or developing ring) on the frame extension end 111. The bracket collecting end 113 is a rod-shaped member, and has at least one end fixedly connected to the bracket catching net 112 and the other end inserted into the first connecting ring 140.
Preferably, the stent 110 is made by cutting a shape memory alloy tube, and then performing heat treatment, shaping and polishing.
Specifically, the rotation direction of the embolectomy holder 110 is determined according to the extending direction of the parallelogram mesh.
In this embodiment, a first coupling ring 140 and an associated embolectomy support 110 serve as an embolectomy group, at least one of which is provided. The arrangement of the bolt taking group is helpful for improving the bolt taking capability of the bolt taking device 100, the catching capability of the bolt taking device 100 on bolts 920 with different sizes and shapes is improved, the probability of repeated bolt taking is reduced, and the efficiency of bolt taking operation is improved.
In another embodiment of this embodiment, as shown in fig. 3, 14 and 15, two bolt sets are provided, and the parallelogram meshes of the two bolt supports 110 are twisted around the axis of the guide in opposite directions, so that the rotation directions of the two bolt sets are opposite. Two bolt groups are arranged at intervals along the extending direction of the guide piece, and two adjacent bolt groups can have partial area overlapping. Through the limitation to the direction of rotation of two bolt groups, can adjust the action of bolt module when withdrawing to can further promote bolt ability, reduce the risk that bolt 920 drops. In other embodiments of this embodiment, the rotation directions of the two bolt sets are the same.
With continued reference to fig. 2, further, the parallelogram grid has long sides and short sides, a ratio of the length of the long sides to the length of the short sides is greater than a proportional threshold, and an included angle between the long sides and the short sides is within an angle threshold range. The design limits the size ratio of the long side to the short side and the range of the included angle, and limits the parallelogram grids, so that the self-adaptive capacity of the rotation of the bolt taking bracket 110 is ensured, and the rotation action of the first connecting ring 140 is accurately and effectively completed.
In this embodiment, the proportional threshold is 1.1, and the angular threshold ranges from 60 ° to 120 °. Preferably, the ratio of the length of the long side to the length of the short side is within 1.5-3.
As shown in fig. 4, 14 and 15, in another embodiment of this embodiment, the stent expansion end 111 is fixedly connected with a second connection ring 170, and the second connection ring 170 is sleeved on the guide member and can move along the length direction of the blood vessel 910. The second connecting ring 170 can slide freely along with the contraction or expansion of the embolectomy stent 110, which is beneficial to completing the delivery action of the embolectomy stent 110 and can avoid the condition that the stent extending end 111 damages the blood vessel 910.
As shown in fig. 10, 11, 14 and 15, in the present embodiment, the first connecting ring 140 includes a first inner ring 141, a middle ring 142 and a first outer ring 143 that are sequentially sleeved from inside to outside, the middle ring 142 has a plug-in port penetrating therethrough, and the plug-in port is communicated with an end face of the middle ring 142; the socket, the first inner ring 141 and the first outer ring 143 form a socket groove 144, and the bracket converging end 113 is plugged in the socket groove 144. Specifically, the end of the bracket converging end 113 away from the bracket catching net 112 is provided with a bracket connector 114, and the bracket connector 114 completely extends into the insertion groove 144. The first inner ring 141 provides a penetrating space for the guide member, and the processing cost of the first connection ring 140 is greatly reduced by means of the split design of the first inner ring 141, the middle ring 142 and the first outer ring 143 to form the insertion groove 144. The design ensures the stable connection between the bracket converging end 113 and the first connecting ring 140, and reduces the risk of position deviation or falling off of the thrombectomy bracket 110 in the thrombectomy process.
Preferably, each member of the first connecting ring 140 is cut from a metal or polymer tube.
In this embodiment, the components of the connecting ring and the guide piece can be connected together by glue, laser welding and the like. The specific connection method is a conventional technical means in the art, and is well known by those skilled in the art, and will not be described herein.
As shown in fig. 13, in this embodiment, the outer peripheral wall of the guide member is convexly provided with a limiting protrusion, and when the bolt taking bracket 110 is displaced relative to the guide member, the first connecting ring 140 is stopped by the first connecting ring 140 and abuts against the limiting protrusion. Under the condition that the thrombus removal support 110 is withdrawn or pushed forwards, the limiting protrusion drives the thrombus removal support 110 to move by directly contacting with the first connecting ring 140 and ensures that the first connecting ring 140 can rotate in a self-adaptive manner, so that the thrombus removal device 100 can smoothly and stably operate.
Preferably, the limiting protrusion is made of medical metal or polymer material, such as medical stainless steel, nitinol, cobalt-based alloy, titanium alloy or magnesium alloy, or developing material such as gold, platinum iridium, platinum tungsten or tantalum may be selected to increase the development property of the proximal end of the thrombectomy stent 110; the limiting protrusion is connected with the inner tube 120 by glue bonding, laser welding or hot melt welding.
In other embodiments of this embodiment, the limiting protrusion is a spherical member, and the above design greatly reduces the contact area between the limiting protrusion and the first connecting ring 140, thereby reducing the rotation resistance of the bolt-removing bracket 110.
As shown in fig. 1, 14 and 15, the present embodiment further provides an embolectomy system, which can be placed in a blood vessel 910, and comprises an embolectomy device 100 and a distal protection device 200; the thrombus removal device 100 comprises a guide part and a thrombus removal module, the far-end protection device 200 comprises a device framework 210, a knitting wire 220 and a third connecting ring 230 which are connected end to end, the guide part is sleeved with the device framework 210, the knitting wire 220 is wound on one end of the device framework 210, the knitting wire 220 is gathered in the third connecting ring 230, the guide part is sleeved with the third connecting ring 230, and an opening of the far-end protection device 200 is opposite to an opening of the thrombus removal support 110.
The embolectomy system can collect the broken and fallen embolus fragments 921 out of the body by the distal protection device 200, and prevent the downstream blood vessel 910 from being blocked. The setting of filter screen can realize effectively the action of catching embolus 920, can realize the zonulae occludens of filter screen and device skeleton 210 through the design of weaving silk 220 winding in device skeleton 210, has reduced the risk of distal end protection device 200 damage, weave silk 220 and draw in the design of third go-between 230 and make the filter screen mesh narrow gradually from embolus 920 near-end to embolus 920 distal end, realized the optimization to the filter screen effect of catching from this. The design that the distal protection device 200 faces the opening of the embolectomy support 110 can surround the embolus 920 from two sides, so that the risk that the embolus 920 is separated from the embolectomy system is greatly reduced. The bolt taking device 100 and the far-end protection device 200 are arranged in a split manner, so that the bolt taking operation process of the bolt taking system is improved, the complex bolt taking working environment can be met, the working flexibility can be greatly improved, and the bolt taking operation efficiency can be improved; through the design that the guide member is sleeved by the third connection ring 230, the distal protection device 200 and the embolectomy device 100 can be quickly positioned, and the embolectomy operation can be smoothly and accurately completed by the design of a split structure.
The embolectomy system is small in size, and the distal protection device 200 and the embolectomy device 100 are both easy to improve visualization. The distal protection device 200 has the advantage of good adherence, effectively reducing the risk of injury to the blood vessel 910. The filter screen is the toper structure, and the mesh of toper filter screen is by embolus 920 near-end to embolus 920 distal end taper, and then can promote the effect of catching to different size embolus piece 921.
Specifically, the thickness of the filter screen is 10-1000 μm, and the mesh diameter of the filter screen is 10-1000 μm.
As shown in fig. 1, 5, 14 and 15, the filter screen separates the device framework 210 from the inner wall of the blood vessel 910, and the surface of the filter screen is smooth, so that the damage of the device framework 210 to the inner wall of the blood vessel 910 can be reduced; the diameter of the knitting yarn 220 is 0.05-0.3mm, and the material is medical polymer yarn or medical metal wire; the filter screen can be provided with at least one developing wire of platinum iridium, platinum tungsten, platinum and the like, so that the filter screen can be integrally developed. The selection of the specific material of the filter screen is well known in the art, and is well known to those skilled in the art, and will not be described herein.
The above design allows the filter screen to collect emboli 920 without obstructing blood flow. The device framework 210 is formed by cutting or weaving medical memory alloy pipes and then performing heat treatment and shaping; the filter screen is woven by medical wires or punched by medical membrane materials, and can be coated on the outer surface of the device framework 210 in a hot melting, bonding, welding and other modes.
As shown in fig. 5-7, a frame connector 215 is further disposed on the other side of the frame link 211, the frame connector 215 is fixedly connected to a fourth connecting ring 240, and the fourth connecting ring 240 is sleeved on the guide member. The fourth connection ring 240 is arranged to realize the positioning effect of the device framework 210 and the guide piece, further facilitate the positioning of the distal end protection device 200 and the embolectomy device 100, and avoid the damage of the framework connection rod 211 to the blood vessel 910.
In this embodiment, the device frame 210 includes a frame link 211 and a frame knitting part 212 disposed on one side of the frame link 211, the frame knitting part 212 forms frame holes 214, the frame holes 214 are uniformly spaced around the axis of the guide, the frame knitting part 212 has knitting holes 213 therethrough, and the plurality of knitting holes 213 are uniformly spaced around the frame holes 214; each of the knitting filaments 220 passes through one of the knitting holes 213, and both ends thereof are fixedly coupled to the third coupling ring 230. Specifically, the weaving holes 213 are cut by laser. The connecting structure of the knitting yarn 220 on the device framework 210 is simple, the connecting strength is high, the problem of falling or deviation is not easy to occur, and the effect of thrombus removal operation is guaranteed.
The distance d between every two adjacent weaving holes 213 in the circumferential direction of the frame link 211 is the same, and the above design ensures that the weaving holes 213 are uniformly distributed on the frame link 211. The reinforced convex plate is arranged near the weaving hole 213, the reinforced convex plate avoids the situation that the strength of the framework connecting rod 211 is reduced due to the arrangement of the weaving hole 213, so that the strength of each part of the framework connecting rod 211 is the same, and the expansion action of the framework connecting rod 211 is more uniform due to the arrangement.
Preferably, the part of the frame knitting part 212 forming the frame holes 214 evenly distributed around the axis of the guiding element is divided into a knitting frame, and the third connecting ring 230 connected with the knitting frame through the knitting wire 220, the knitting wire 220 connected to the knitting frame and the knitting frame form a storage net bag; the storage net bag is provided with at least one, and the weaving frame of the next storage net bag is coaxially and fixedly connected with one end, far away from the bolt taking device 100, of the weaving frame of the previous storage net bag.
The setting of a plurality of string bags of accomodating makes the filter screen denser, helps improving distal end protection device 200's catching ability, has promoted distal end protection device 200 to the effect of catching of the embolus piece 921 of different sizes and shapes, has reduced embolus piece 921 and has blockked up vascular 910's risk again.
As shown in fig. 9, the process flow of the distal protection device 200 includes the following steps: sleeving the device framework 210 on the outer surface of the weaving mandrel 800, so that the device framework 210 and the weaving mandrel 800 are relatively fixed; the knitting yarn 220 is passed through the knitting hole 213, and both ends of the knitting yarn 220 are connected to the knitting machine; after weaving is completed, the filter screen and the device framework 210 are subjected to heat setting; after the setting is completed, both ends of the braided wire 220 are fixed by the third connection ring 230.
As shown in fig. 5-7 and 12, in the present embodiment, the third connection ring 230 includes a second inner ring 231 and a second outer ring 232 coaxially sleeved on the second inner ring 231, and the second inner ring 231 and the second outer ring 232 form a receiving cavity; both ends of the braided wire 220 are threaded into the accommodating cavities. Specifically, the second inner ring 231 is fixedly connected to the second outer ring 232.
The second inner ring 231 provides a penetrating space for the guide member, and the processing cost of the third connection ring 230 is greatly reduced by means of a manner of forming an accommodating cavity by means of a split design of the second inner ring 231 and the second outer ring 232. The above design ensures the firm connection between the braided wire 220 and the third connecting ring 230, and reduces the risk of position deviation or falling off of the filter screen during the embolectomy process.
Specifically, the braided wire 220 and the third connecting ring 230 are fixedly connected by welding or gluing. The second inner ring 231 can be cut from a medical polymer or metal tube, and the second outer ring 232 can be made of developing materials such as platinum iridium, platinum tungsten or platinum, so that the developing performance of the far end of the embolus 920 is better.
Through the mode of promoting the developability, can make thrombectomy device 100 and distal end protection device 200 all can wholly develop, and then help guaranteeing the transport of thrombectomy system, expand and withdraw the accurate completion of action.
With continued reference to fig. 1, 14 and 15, in this embodiment, the embolectomy system further includes a pushing rod 400, a guiding catheter 500 and a thrombus extraction catheter 600, which are sequentially sleeved from inside to outside, wherein the embolectomy device 100 and the distal protection device 200 can be retracted in the guiding catheter 500, one end of the guiding element away from the distal protection device 200 is fixedly connected to the pushing rod 400, and the thrombus extraction catheter 600 is used for sucking the embolus 920 during the operation and recovering the distal protection device 200 and the embolectomy device 100. The bolt taking system is simple and reliable in structure and stable in operation, and ensures that bolt taking operation by the bolt taking system can be smoothly and efficiently completed through mutual matching work among all components.
In this embodiment, the guiding member includes an inner tube 120 and a guide wire 300, an opening tip 130 is fixedly connected to one end of the inner tube 120 close to the distal end protection device 200, the guide wire 300 passes through the inner tube 120 and the opening tip 130, the first connecting ring 140 is sleeved on the inner tube 120, and the guide wire 300 passes through the third connecting ring 230 and is connected to the distal end protection device 200. The design of the guide wire 300 with low rigidity is selected, so that the positioning difficulty of the guide piece and the far-end protection device 200 is reduced, and the guide piece and the far-end protection device 200 can be smoothly and quickly aligned.
Specifically, the limiting protrusion on the inner tube 120 is an inner tube convex ring 121, and the inner tube convex ring 121 is sleeved on the outer side wall of the inner tube 120.
The embodiment also provides a thrombus removal method applied to the thrombus removal system, which comprises the following steps:
the method comprises the following steps: a puncture is made at the target site and a puncture hole is created, and a embolectomy system is advanced through the puncture hole to the embolic site of blood vessel 910, with distal protection device 200 positioned distal to the embolic site, through embolus 920.
Step two: the guiding catheter 500 is withdrawn, releasing the distal protection device 200, allowing the distal protection device 200 to gradually expand until it conforms to the inner wall of the blood vessel 910.
Step three: the embolectomy device 100 is guided through the embolus 920 by the guide wire 300 and the guide catheter 500, the guide catheter 500 is withdrawn, the embolectomy device 100 is released, and the embolectomy device 100 is gradually expanded until the embolus 920 is completely wrapped by the embolus removing bracket 110.
Step four: guide catheter 500 is withdrawn from blood vessel 910.
Step five: after the embolectomy support 110 is sufficiently engaged with the embolus 920, the embolectomy device 100 and the embolus 920 located in the embolectomy device 100 are withdrawn into the embolus-sucking catheter 600.
Step six: the distal protective device 200 and the embolic debris 921 located in the distal protective device 200 are withdrawn into the thrombus catheter 600, withdrawing the thrombus catheter 600 out of the blood vessel 910.
The thrombus removal method successfully completes the expansion action of the thrombus removal system by positioning and expanding the far-end protection device 200, positioning the thrombus removal device 100 by the guide wire 300 and finally expanding the thrombus removal device 100; the planning of the above process is simple and accurate, the flexibility of positioning the embolectomy device 100 and the far-end protection device 200 is guaranteed by utilizing split design, and the positioning time of the embolectomy device 100 and the far-end protection device 200 is effectively shortened, so that the embolectomy operation can be smoothly and efficiently completed. The method has the advantages of wide application range, simplicity and convenience in operation and low workload, effectively simplifies the process of embolectomy operation, reduces the risk of embolectomy misoperation, improves the embolectomy effect, reduces the risk of residue of the embolus fragments 921, and ensures the personal safety of patients.
After deployment in the vessel 910, the thrombectomy stent 110 gradually expands as the temperature increases, binding with the embolus 920. If an embolectomy procedure does not completely remove embolus 920, embolectomy device 100 may be re-deployed for retrieval until embolus 920 is completely removed.
As shown in fig. 16, in another embodiment of this embodiment, the guide member includes an inner rod 150 and a guide wire 300, an end of the inner rod 150 near the distal end protection device 200 is fixedly connected with an inner rod tip 160, the guide wire 300 passes through the inner rod 150 and the inner rod tip 160, and the first connection ring 140 and the third connection ring 230 are both sleeved on the inner rod 150.
Specifically, the limiting protrusion on the inner rod 150 is an inner rod convex ring, and the inner rod convex ring is sleeved on the outer side wall of the inner rod 150.
The embodiment also provides another embolectomy method, which is applied to the embolectomy system and comprises the following steps: the method comprises the following steps: a puncture is made at the target site and a puncture hole is formed, the embolectomy system is inserted into the embolus site of the blood vessel 910 through the puncture hole, the guide wire 300 and the inner rod 150 are successively passed through the embolus 920, and the distal end protection device 200 is placed at the distal end of the embolus site.
Step two: the guiding catheter 500 is withdrawn, the distal protection device 200 and the embolectomy device 100 are released, the distal protection device 200 is gradually expanded until the distal protection device is attached to the inner wall of the blood vessel 910, and the embolectomy device 100 is gradually expanded until the embolectomy stent 110 completely covers the embolus 920.
Step three: guide catheter 500 is withdrawn from blood vessel 910.
Step four: after the thrombus taking support 110 is fully combined with the thrombus 920, the pushing rod 400 is retracted towards the thrombus guiding tube 600, the thrombus taking device 100 and the distal end protection device 200 are successively collected in the thrombus guiding tube 600, and the thrombus 920 in the thrombus taking device 100 and the thrombus debris 921 in the distal end protection device 200 are collected in the thrombus guiding tube 600.
Step five: the thrombectomy catheter 600 is withdrawn from the blood vessel 910.
According to the thrombus removal method, the inner rod 150 is positioned by using the guide wire 300, the distal end protection device 200 and the thrombus removal device 100 are positioned, and the distal end protection device 200 and the thrombus removal device 100 are unfolded to complete the unfolding action of the thrombus removal system, so that the unfolding action of the thrombus removal system can be smoothly completed by the above process; the thrombus taking method also ensures that the thrombus taking operation can be smoothly and efficiently completed.
The thrombus removal method successfully completes the expansion action of the thrombus removal system by positioning and expanding the far-end protection device, positioning the thrombus removal device by the guide wire and expanding the thrombus removal device; the planning of the above process is simple and accurate, the flexibility of positioning of the bolt taking device and the far-end protection device is guaranteed by utilizing split design, and the positioning time of the bolt taking device and the far-end protection device is effectively shortened, so that the bolt taking operation can be smoothly and efficiently completed. The method has the advantages of wide application range, simple and convenient operation and low workload, effectively simplifies the process of embolectomy operation, reduces the risk of embolectomy misoperation, improves the embolectomy effect, reduces the risk of embolus debris residue, and ensures the personal safety of patients.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (9)

1. An embolectomy system capable of being placed within a blood vessel (910), comprising:
the thrombus taking device (100) comprises a guide piece, a thrombus taking module, a pushing rod (400), a guide conduit (500) and a thrombus absorbing conduit (600), wherein the pushing rod (400), the guide conduit and the thrombus absorbing conduit (600) are sequentially sleeved from inside to outside, the guide piece extends along the length direction of a blood vessel (910), the thrombus taking module comprises a thrombus taking support (110) and a first connecting ring (140), the thrombus taking support (110) is sleeved on the guide piece, the thrombus taking support (110) comprises a support catching net (112) and a support binding end (113) which are connected end to end, the support binding end (113) is fixedly connected to the first connecting ring (140), and the first connecting ring (140) is sleeved on the guide piece;
the far-end protection device (200) comprises a device framework (210), a braided wire (220) and a third connecting ring (230) which are connected end to end, the device framework (210) is sleeved on the guide piece, the braided wire (220) is wound on one end of the device framework (210), the braided wire (220) is furled in the third connecting ring (230), the third connecting ring (230) is sleeved on the guide piece, and an opening of the far-end protection device (200) is opposite to an opening of the thrombus taking support (110);
the thrombus removal device (100) and the distal end protection device (200) can be both collected in the guide catheter (500), one end of the guide piece, which is far away from the distal end protection device (200), is fixedly connected to the pushing rod (400), and the thrombus suction catheter (600) is used for recovering the thrombus (920), the distal end protection device (200) and the thrombus removal device (100); the guide piece comprises an inner tube (120) and a guide wire (300), the guide wire (300) penetrates through the inner tube (120), the first connecting ring (140) is sleeved on the inner tube (120), and the guide wire (300) penetrates through the third connecting ring (230) and is connected with the far-end protection device (200); the guide piece comprises an inner rod (150) and a guide wire (300), the guide wire (300) penetrates through the inner rod (150), and the first connecting ring (140) and the third connecting ring (230) are sleeved on the inner rod (150).
2. The embolectomy system of claim 1, wherein a first connecting ring (140) and an associated embolectomy support (110) form a group of embolectomy devices, at least one of which is provided.
3. The embolectomy system of claim 1, wherein the stent catchment net (112) forms a parallelogram lattice, the parallelogram lattice being helically distributed about the axis of the guide, the stent catchment net (112) being capable of rotating the first link ring (140) about the axis of the guide.
4. The embolectomy system of claim 3, wherein there are two embolectomy groups, and the parallelogram meshes on the two embolectomy supports (110) are helical about the axis of the guide in opposite directions, so that the rotation directions of the two embolectomy groups are opposite; two bolt groups are arranged at intervals along the extending direction of the guide piece, and two adjacent bolt groups can have partial area overlapping.
5. The embolectomy system of claim 3, wherein the ratio of the length of the long side to the length of the short side of the parallelogram mesh is within 1.5-3.
6. The embolectomy system of claim 1, wherein the outer peripheral wall of the guide member is convexly provided with a stop protrusion, and when the embolectomy support (110) is displaced relative to the guide member, the first connection ring (140) is stopped by the first connection ring (140) against the stop protrusion.
7. The embolectomy system of claim 6, wherein the stop protrusion is a ball-shaped member.
8. The embolectomy system of claim 1, wherein the device frame (210) comprises a frame link (211) and a frame woven portion (212) disposed on one side of the frame link (211), the frame woven portion (212) forms frame holes (214), the frame holes (214) are uniformly spaced around an axis of the guide, the frame woven portion (212) has woven holes (213) therethrough, and a plurality of the woven holes (213) are uniformly spaced around the frame holes (214); each weaving wire (220) passes through one weaving hole (213), and two ends of each weaving wire are fixedly connected to the third connecting ring (230); a framework connecting head (215) is arranged on the other side of the framework connecting rod (211), the framework connecting head (215) is fixedly connected to a fourth connecting ring (240), and the fourth connecting ring (240) is sleeved on the guide piece; a part of the skeleton-woven part (212) forming the skeleton holes (214) evenly distributed at intervals around the axis of the guide is divided into a woven frame, and the third connecting ring (230) connected with the woven frame through the woven wires (220), the woven wires (220) connected with the woven frame and the woven frame form a storage net bag; accomodate the string bag and be equipped with at least one, the latter accomodate the string bag weave the coaxial rigid coupling of frame in the former accomodate the string bag weave the frame and keep away from the one end of thrombectomy device (100).
9. The embolectomy system of claim 1, wherein the third connecting ring (230) comprises a second inner ring (231) and a second outer ring (232) coaxially sleeved on the second inner ring (231), and the second inner ring (231) and the second outer ring (232) form a containing cavity; both ends of the knitting silk (220) are threaded in the accommodating cavity.
CN202211544074.2A 2022-07-13 2022-07-13 Bolt taking system Pending CN115886936A (en)

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CN115281905A (en) * 2022-08-30 2022-11-04 苏州中天医疗器械科技有限公司 Thrombectomy support, thrombectomy device and thrombectomy system
CN115177323A (en) * 2022-09-09 2022-10-14 苏州中天医疗器械科技有限公司 Thrombus taking device and thrombus taking system

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EP1402826B1 (en) * 2002-08-20 2013-06-12 Nipro Corporation Thrombus capture catheter
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