CN116919530A

CN116919530A - Thrombolysis device for realizing expandable distal end bundle port by utilizing bundle-contracting traction wire

Info

Publication number: CN116919530A
Application number: CN202210367533.8A
Authority: CN
Inventors: 翟梦林; 晏伟; 刘振全; 孙冰; 贾晶
Original assignee: Shanghai Warm Sun Medical Instrument Co ltd
Current assignee: Shanghai Warm Sun Medical Instrument Co ltd
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2023-10-24

Abstract

The invention discloses a thrombus taking device for realizing an expandable distal end binding port by utilizing a binding traction wire, which comprises a catheter, wherein the catheter comprises a catheter main body and an expandable distal end, the expandable distal end is fixedly connected with the distal end of the catheter main body, a binding wire used for controlling the expandable distal end to self-expand or press binding is arranged on the side wall of the expandable distal end, the binding wire is arranged around the expandable distal end and forms a ring matched with the expandable distal end in shape, and the traction wire is fixedly connected to the binding wire.

Description

Thrombolysis device for realizing expandable distal end bundle port by utilizing bundle-contracting traction wire

[ field of technology ]

The invention relates to the technical field of medical appliances, in particular to the technical field of thrombus taking devices.

[ background Art ]

Thrombus is a small block of blood flow formed on the surface of the inside surface of a cardiovascular system vessel where it is exfoliated or repaired. In the variable fluid dependency, the thrombus consists of insoluble fibrin, deposited platelets, accumulated leukocytes and entrapped erythrocytes. There are two mechanisms in the human body for thrombus, the mechanism of thrombus generation is called: a coagulation system; the mechanism of clearing thrombus is called: fibrinolytic system. Once the blood vessel of the human body is damaged, the coagulation system is activated immediately, and the continuous bleeding is prevented; once a thrombus occurs, the fibrinolytic system that eliminates the thrombus activates, dissolving the clot away. The two systems are dynamically balanced to ensure that the blood neither coagulates nor bleeds too much.

Once this balance is broken, the thrombus occludes the vessel, leading to serious thrombotic disease. Thrombotic diseases including apoplexy, coronary heart disease, pulmonary embolism, etc. are one of the important diseases that seriously threaten life health of human beings and cause death and disability. Data statistics show that thrombotic diseases account for more than 51% of human disease mortality. Therefore, it is necessary to design a high-efficiency thrombus removing device.

The thrombus is removed by a plurality of means, firstly, the thrombus is dissolved by a medicine pouring mode, secondly, the thrombus is taken out by a thrombus taking bracket in a dragging mode, and the thrombus is assisted by a balloon or not; the other is to use an aspiration catheter to manually or automatically withdraw the endovascular plug into the catheter. The current common thrombolytic therapy method combines several modes: the thrombus is first dissolved or dragged by chemical or mechanical means, further combined with the aspiration function of the catheter, and the plug is retrieved into the catheter and subsequently removed from the vessel. The key to achieving this technique is to retrieve the plug as completely as possible and maximize aspiration efficiency, which can be achieved when the vessel is completely interrupted while the catheter has a larger caliber and lumen.

The invention patent of application publication number CN112472211A discloses a catheter device with an expandable guide head end, which comprises a three-way connecting seat, a catheter, a connecting seat, a delivery sheath, an expandable guide head end and an auxiliary expansion tube; the catheter proximal aspiration opening is provided with a self-expanding expandable guide head end which can temporarily block or reduce blood flow, thereby reducing the impact of blood flow force on the obstruction and improving the obstruction removal efficiency. However, the double-layer structure of the delivery sheath and the catheter reduces the inner diameter of the aspiration catheter, reduces aspiration efficiency, and some thrombus with larger diameter may not be effectively aspirated.

[ invention ]

The invention aims to solve the problems in the prior art, and provides a thrombus taking device for realizing an expandable distal end bundle port by utilizing a bundle-contracting traction wire, which reduces the thickness of a catheter, is convenient for cleaning thrombus and can effectively improve the suction efficiency.

In order to achieve the above-mentioned purpose, the invention provides a thrombus removing device for realizing an expandable distal end ligation opening by using a retraction wire, comprising a catheter, wherein the catheter comprises a catheter main body and an expandable distal end which is arranged at the distal end of the catheter main body and has a diameter-expandable structure, the expandable distal end is in a horn shape with the diameter gradually increased from being close to the end of the catheter main body to being far away from the end of the catheter main body, the expandable distal end is fixedly connected with the distal end of the catheter main body, the side wall of the expandable distal end is provided with the retraction wire for controlling the self-expanding or compression and contraction of the expandable distal end, the retraction wire is arranged around the expandable distal end and forms a ring matched with the shape of the expandable distal end, the retraction wire is fixedly connected with the retraction wire, and the retraction wire is axially arranged along the catheter, and the retraction wire can be controlled to shrink the diameter of the ring by pulling the retraction wire;

the expandable distal end is of a reticular structure, and the binding silk is inserted through the reticular structure pores of the expandable distal end and is slidably connected with the reticular structure pores; or the expandable distal end side wall is provided with a plurality of annular channels for being matched with the binding wires, and the binding wires are slidably connected with the annular channels.

Preferably, one end of the convergent wire is fixedly connected with the outer wall of the expandable distal end, and the other end of the convergent wire is fixedly connected with the traction wire after winding the expandable distal end.

Preferably, the traction wire comprises a first traction wire and a second traction wire, the tow collecting wire is arranged around the expandable distal end, two ends of the tow collecting wire are not fixedly connected with the expandable distal end, and two ends of the tow collecting wire are respectively and fixedly connected with the first traction wire and the second traction wire.

Preferably, both ends of the drawing wire are fixedly connected with the outer wall of the expandable distal end, and the distal end of the drawing wire is fixedly connected with the non-end part of the drawing wire.

Preferably, the number of the traction wires is at least two, and the number of the traction wires is two.

Preferably, the catheter main body further comprises a catheter outer layer sleeved on the outer wall of the catheter main body, and the traction wire is slidably arranged between the catheter outer layer and the catheter main body.

Preferably, the catheter main body is internally provided with a hollow cavity, and the traction wire can be slidably arranged in the hollow cavity in the catheter main body.

Preferably, the annular channel is made of a highly elastic material, and the annular channel and the expandable distal end are connected by gluing, welding or soldering.

Preferably, the expandable distal end is provided with a serpentine spring arranged around the outer wall or the inner wall of the expandable distal end, the serpentine spring is in a closed loop shape fixedly connected end to end, and the serpentine spring is arranged on the expandable distal end and is close to a loop formed by the converging wire.

Preferably, one end of the expandable distal end far away from the catheter main body is provided with a plurality of closing-in support legs extending towards the end far away from the catheter main body, one end of the closing-in support legs far away from the catheter main body is provided with first magnetic attraction blocks which can be mutually magnetically attracted and matched, and the first magnetic attraction blocks on the closing-in support legs can be mutually matched and magnetically attracted and connected in a contracted state of the expandable distal end; the first magnetic attraction blocks on the closing-in support legs can be separated from each other in the self-expanding state of the expandable distal end.

Preferably, the distal end of the closing-in leg has a tendency to bend away from the axial center side of the expandable distal end, and the attractive force between the first magnetic attraction blocks is smaller than the elastic restoring force of self-expanding expansion of the expandable distal end.

Preferably, the surface of the first magnetic attraction block is provided with a developing mark.

Preferably, the closing-in support leg comprises a first support leg and a second support leg which are arranged on two sides of the first magnetic attraction block, and a plurality of auxiliary support legs extending towards two sides are arranged in the middle section of the first support leg and/or the second support leg.

Preferably, the auxiliary supporting leg is arranged on the first supporting leg, a plurality of second magnetic blocks are arranged on the second supporting leg, and a third magnetic block which is in magnetic attraction fit with the second magnetic blocks on the adjacent closing-in supporting leg is arranged at the tail end of the auxiliary supporting leg; the second magnetic block is separated from the third magnetic block in the self-expanding state of the expandable distal end.

The invention discloses a thrombus taking device for realizing an expandable distal end bundle port by utilizing a bundle-contracting traction wire, which has the beneficial effects that: according to the invention, the self-expansion opening and the closing of the expandable distal end are controlled through the cooperation of the traction wire and the closing wire, the conveying and the thrombus taking of the expandable distal end can be realized only by a single-layer catheter main body, the thickness of the catheter is reduced, the inner diameter of the catheter is maximized, thrombus cleaning is facilitated, the suction efficiency can be effectively improved, the expandable distal end is suitable for blood vessels with different inner diameters, the distal end of the expandable distal end is provided with the closing-in supporting legs, the distal ends of the closing-in supporting legs are provided with the first magnetic attraction blocks, when the expandable distal end is in a press-holding and shrinking state, the first magnetic attraction blocks can mutually and magnetically cooperate to close the opening of the distal end of the expandable distal end, the opening is restrained, the opening is enabled to run in the blood vessel more smoothly, and the inner wall of the blood vessel is prevented from being scratched at the opening.

The features and advantages of the present invention will be described in detail by way of example with reference to the accompanying drawings.

[ description of the drawings ]

Fig. 1 is a schematic structural view of a embolectomy device for realizing an expandable distal stoma in a delivery configuration using a convergent traction wire according to an embodiment of the invention.

Fig. 2 is a schematic structural view of a embolectomy device for realizing an expandable distal stoma by using a convergent traction wire in a embolectomy state according to an embodiment of the present invention.

Fig. 3 is a schematic structural view of a embolectomy device for realizing an expandable distal stoma in a second delivery configuration using a convergent traction wire according to an embodiment of the invention.

Fig. 4 is a schematic structural diagram of a embolectomy device for realizing an expandable distal bundle port by utilizing a bundle-contracting traction wire in a second embolectomy state according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a embolectomy device for realizing an expandable distal stoma in a third delivery configuration using a convergent traction wire in accordance with the present invention.

Fig. 6 is a schematic structural diagram of a thrombus removing device in a third thrombus removing state for realizing an expandable distal end bundle port by using a bundle-drawing traction wire according to the present invention.

Fig. 7 is a schematic structural view of a four-delivery-state embolectomy device for realizing an expandable distal stoma using a convergent-divergent pull wire according to an embodiment of the present invention.

Fig. 8 is a schematic structural view of a four-embolectomy device for realizing an expandable distal stoma by using a convergent traction wire according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of a cross-sectional structure of a fourth, fifth and sixth embodiment of a thrombus removing device for realizing an expandable distal end opening by using a convergent traction wire.

Fig. 10 is a schematic diagram of an enlarged annular channel structure of a thrombolytic device using a convergent traction wire to achieve an expandable distal stoma in accordance with the present invention.

Fig. 11 is a schematic structural view of a fifth delivery state of an exemplary embolectomy device utilizing a convergent-divergent distal bundle opening in accordance with the present invention.

Fig. 12 is a schematic structural view of a fifth embolectomy device for realizing an expandable distal stoma by using a convergent traction wire according to an embodiment of the present invention.

Fig. 13 is a schematic structural view of a embolectomy device for realizing an expandable distal stoma in a sixth delivery configuration using a convergent traction wire in accordance with the present invention.

Fig. 14 is a schematic structural view of a thrombus removing device for realizing an expandable distal end opening by using a convergent traction wire in a sixth thrombus removing state according to an embodiment of the present invention.

Fig. 15 is a schematic view of a seventh cross-sectional structure of an exemplary embolectomy device for realizing an expandable distal stoma using a convergent traction wire.

FIG. 16 is a schematic illustration of an eight-section configuration of an exemplary embodiment of a thrombolytic device utilizing a convergent traction filament to achieve an expandable distal stoma.

Fig. 17 is a schematic view of a ninth embodiment of a thrombolytic device for realizing an expandable distal stoma using a convergent traction filament according to the present invention.

Fig. 18 is a schematic view showing a tenth structure of an exemplary embolectomy device for realizing an expandable distal stoma using a convergent traction wire.

In the figure: 1-catheter, 3-pull wire, 4-cinch wire, 5-annular lumen, 6-first magnet, 9-serpentine spring, 101-expandable distal end, 102-catheter body, 301-first pull wire, 302-second pull wire, 1021-catheter outer layer, 1012-cinch leg, 10121-first leg, 10122-second leg, 10123-secondary leg, 7-second magnet, 8-third magnet.

[ detailed description ] of the invention

The present invention will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.

In the description of the present invention, it will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

In the description of the present invention, it should be noted that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships in which the inventive product is conventionally placed in use, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The meaning of "a number" is one or more than one unless specifically defined otherwise.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Embodiment one:

referring to fig. 1 and 2, the invention relates to a thrombus removing device for realizing an expandable distal end binding opening by using a binding traction wire, which comprises a catheter 1, wherein the catheter 1 comprises a catheter main body 102 and an expandable distal end 101 with a diameter expandable structure, wherein the expandable distal end 101 is arranged at the distal end of the catheter main body 102. The expandable distal end 101 is flared with a gradually increasing diameter from the end proximal to the catheter body 102 to the end distal to the catheter body 102. The expandable distal end 101 is fixedly connected with the distal end of the catheter main body 102, and the side wall of the expandable distal end 101 is provided with a constriction wire 4 for controlling the self-expansion of the expandable distal end 101 or the compression constriction. The convergent wire 4 is arranged around the expandable distal end 101 and forms a ring matched with the shape of the expandable distal end 101, the convergent wire 4 is fixedly connected with the traction wire 3, the traction wire 3 is axially arranged along the catheter 1, and the diameter of the ring can be reduced by pulling the traction wire 3. The drawing wire 3 is pulled to reduce the diameter of a ring formed by the drawing wire 4 by inserting or winding the drawing wire 4 on the expandable distal end 101, so as to press the expandable distal end 101, keep the expandable distal end 101 in a pressed state and guide the expandable distal end in a blood vessel to approach a thrombus through a guide wire or other devices. After confirming the position, the pull wire 3 is released, allowing the catheter-expandable distal end 101 to naturally expand against the inner wall of the vessel. Further, the thrombus is retrieved into the catheter by aspiration through the catheter 1 using a manual aspiration device with a syringe or a mechanical automatic aspiration pump. After confirming that the thrombus enters the catheter, the traction wire 3 is pulled to enable the expandable distal end of the catheter to be in a pressed and held contracted state, and the catheter is retracted, so that the device is integrally recovered. The traction wire 3 and the tow-gathering wire 4 in the embodiment are matched to control the self-expansion and the tow-gathering of the expandable distal end 101, the conveying and the thrombus taking of the expandable distal end 101 can be realized only by the single-layer catheter main body 102, the thickness of the catheter is reduced, thrombus is convenient to clean, the suction efficiency can be effectively improved, and the device is suitable for blood vessels with various thicknesses. In this embodiment, the end far away from the operator is the distal end, and the end near the operator is the proximal end.

Referring to fig. 1, the expandable distal end 101 is a mesh structure, and the cinch wire 4 is inserted through and slidably connected to the mesh structure aperture of the expandable distal end 101. In this embodiment, the filament winding 4 is directly inserted through the hole of the expandable distal end 101, and there is no need to additionally provide a structure for fixing the filament winding 4 on the expandable distal end 101, so that the device is convenient to install and fix, simple in structure and low in cost.

Referring to fig. 1 and 2, one end of the converging wire 4 is fixedly connected with the outer wall of the expandable distal end 101, and the other end is fixedly connected with the traction wire 3 after winding around the expandable distal end 101. In this embodiment, the self-expanding and the retraction of the expandable distal end 101 can be controlled by pulling the end of the retraction wire 4 by the pulling wire 3, which is more convenient to control.

Embodiment two:

referring to fig. 3 and 4, the present embodiment differs from the first embodiment in that the traction wire 3 includes a first traction wire 301 and a second traction wire 302. The tow collecting wire 4 is arranged around the expandable distal end 101, two ends of the tow collecting wire 4 are not fixedly connected with the expandable distal end 101, and two ends of the tow collecting wire 4 are respectively fixedly connected with the first traction wire 301 and the second traction wire 302. In this embodiment, the two ends of the traction wire 3 are not fixedly connected with the expandable distal end 101, and the first traction wire 301 and the second traction wire 302 for controlling the bundling wire 4 are arranged at the two ends, and the diameter of the loop formed by the bundling wire 4 is reduced by pulling the first traction wire 301 and the second traction wire 302 at the two ends, so that the expandable distal end 101 is pressed, the expandable distal end 101 is in a pressing and holding bundling state, the stress on the two sides is more uniform, and the expandable distal end 101 is not easy to deform during bundling.

Embodiment III:

referring to fig. 5 and 6, the difference between the first embodiment and the second embodiment is that both ends of the drawing wire 4 are fixedly connected to the outer wall of the expandable distal end 101, and the distal end of the drawing wire 3 is fixedly connected to a non-end portion of the drawing wire 4. In this embodiment, both ends of the tow collecting wire 4 are fixed on the expandable distal end 101, and the tow collecting wire 4 is pulled by the plurality of traction wires 3, so that the tow collecting wire 4 can deform proximally, thereby reducing the diameter of a loop formed by the tow collecting wire 4, pressing the expandable distal end 101, and making the expandable distal end 101 in a press-holding and tow collecting state, and the tow collecting wire 4 with the structure is connected with the expandable distal end 101 more stably and is not easy to fall off.

Referring to fig. 5 and 6, the traction wires 3 include two traction wires 301 and 302. The traction wire 3 is symmetrically fixed on the outer ring of the expandable distal end 101, so that the periphery of the traction wire 3 can be uniformly stressed, the expandable distal end 101 can be uniformly stressed and contracted, and the operation is more accurate and convenient. The traction wires 3 may be connected by suitable fixing means such as bonding, welding, hot melting, mechanical connection, etc. In another alternative embodiment, the traction wires 3 are not limited to 2, 4 or 6, and the traction wires are fixed symmetrically, so that the stress of the drawing component is balanced when the drawing wires 4 are pulled, and the self-expansion of the expandable distal end 101 of the catheter is smoother.

Embodiment four:

referring to fig. 7, 8, 9 and 10, the difference between the first embodiment and the second embodiment is that the outer sidewall of the expandable distal end 101 is provided with a plurality of annular channels 5 for cooperating with the converging wire 4, and the converging wire 4 is slidably connected with the annular channels 5. In this embodiment, the expandable distal end 101 is provided with a plurality of annular channels 5 to fix the wire harness 4, and this fixing structure is more stable and has higher strength, and the wire harness 4 operates more smoothly and is not easy to be blocked. The annular channels 5 in this embodiment are disposed in an array about the axis of the expandable distal end 101.

Preferably, the annular channel 5 is made of a highly elastic material and is secured to the outer or inner wall of the expandable distal end of the catheter by adhesive, welding or soldering with the expandable distal end 101, among other suitable securing means.

Fifth embodiment:

referring to fig. 9, 10, 11 and 12, on the basis of the second embodiment, the difference between the present embodiment and the second embodiment is that the outer sidewall of the expandable distal end 101 is provided with a plurality of annular channels 5 for cooperating with the converging wire 4, and the converging wire 4 is slidably connected with the annular channels 5. In this embodiment, the expandable distal end 101 is provided with a plurality of annular channels 5 to fix the wire harness 4, and this fixing structure is more stable and has higher strength, and the wire harness 4 operates more smoothly and is not easy to be blocked. The annular channels 5 in this embodiment are disposed in an array about the axis of the expandable distal end 101.

Example six:

referring to fig. 9, 10, 13 and 14, based on the third embodiment, the difference between the present embodiment and the second embodiment is that the outer sidewall of the expandable distal end 101 is provided with a plurality of annular channels 5 for cooperating with the converging wire 4, and the converging wire 4 is slidably connected with the annular channels 5. In this embodiment, the expandable distal end 101 is provided with a plurality of annular channels 5 to fix the wire harness 4, and this fixing structure is more stable and has higher strength, and the wire harness 4 operates more smoothly and is not easy to be blocked. The annular channels 5 in this embodiment are disposed in an array about the axis of the expandable distal end 101.

Embodiment seven:

referring to fig. 15, in the fourth, fifth or sixth embodiments, the catheter body 102 further includes a catheter outer layer 1021 sleeved on the outer wall of the catheter body 102, and the pull wire 3 is slidably disposed between the catheter outer layer 1021 and the catheter body 102. The traction wire 3 is wrapped in the catheter outer layer 1021, so that the damage to a human body caused by the traction wire in the conveying process is avoided.

Example eight:

referring to fig. 16, on the basis of the fourth, fifth or sixth embodiments, a hollow cavity is provided in the catheter main body 102, and the traction wire 3 is slidably provided in the hollow cavity in the catheter main body 102. In this embodiment, the traction wire 3 is directly led out through the inside of the catheter main body 102, so that the structure is simple, the production cost is low, and the diameter of the catheter is not too thick.

Example nine:

referring to fig. 17, the expandable distal end 101 is provided with a serpentine spring 9 disposed about its outer wall, the serpentine spring 9 is in a closed loop shape fixedly connected end to end, and the serpentine spring 9 is disposed on the expandable distal end 101 adjacent to the loop formed by the wire harness 4. The setting of the serpentine spring 9 can improve the self-expansion performance of the expandable distal end 101, avoid that the expandable distal end 101 cannot be self-expanded and opened in the body, and set the serpentine spring 9 at the position of the wire 4 to be matched with the wire 4.

Example ten:

referring to fig. 13 and 14, a plurality of closing-in legs 1012 extending towards the end far away from the catheter main body 102 are arranged at one end far away from the catheter main body 102 on the expandable distal end 101, and first magnetic attraction blocks 6 capable of being mutually magnetically attracted and matched are arranged at one end far away from the catheter main body 102 on the closing-in legs 1012. The first magnetic attraction blocks 6 on the closing-in legs 1012 of the expandable distal end 101 in the contracted state can be mutually matched and magnetically attracted for connection. In this embodiment, by arranging the closing-up leg 1012 at the distal end of the expandable distal end 101 and arranging the first magnetic attraction block 6 at the distal end of the closing-up leg 1012, when the expandable distal end 101 is in a compressed state, the first magnetic attraction block 6 can be mutually magnetically matched, the distal opening of the expandable distal end 101 is closed, the opening size is restricted, the opening is made to run in a blood vessel more smoothly and smoothly, the inner wall of the blood vessel is prevented from being scratched at the opening, after the contraction wire 4 is loosened, the elastic restoring force of the expandable distal end 101 can automatically expand and open the first magnetic attraction block 6, the first magnetic attraction block 6 is disconnected, the expandable distal end 101 can normally expand and be attached to the blood vessel, and when a thrombus is confirmed to enter the catheter, the traction wire 3 is pulled to make the catheter expandable distal end 101 be in a compressed state again, the first magnetic attraction block 6 can be mutually magnetically matched, the opening size of the expandable distal end 101 is restricted, the blood vessel is prevented from being scratched in the back-withdrawing process, and the plug remained in the expandable distal end 101 can be prevented from sliding out.

Preferably, the distal end of the closing leg 1012 has a tendency to bend away from the axial side of the expandable distal end 101, and the attractive force between the first magnetic attraction pieces 6 is smaller than the elastic restoring force of self-expanding expansion of the expandable distal end 101. The closing-in leg 1012 can be bent to the axial center side far away from the expandable distal end 101 in a natural state, so that the closing-in leg 1012 is convenient to be attached to the inner wall of a blood vessel.

Preferably, two closing-in supporting legs 1012 are connected to each first magnetic attraction block 6 respectively, and the two closing-in supporting legs 1012 are adjacent.

Preferably, the surface of the first magnetic attraction block 6 is provided with a developing mark.

Example eleven:

referring to fig. 18, the closing-in leg 1012 includes a first leg 10121 and a second leg 10122 disposed on two sides of the first magnetic attraction block 6, and a plurality of sub-legs 10123 extending to two sides are disposed in the middle section of the first leg 10121. By providing the first leg 10121 with the secondary leg 10123, the concentration of the necked-in legs 1012 can be increased and the rapid sliding out of the remaining pins in the expandable distal end 101 can be further avoided.

Referring to fig. 18, a secondary leg 10123 is disposed on the first leg 10121, a plurality of second magnetic blocks 7 are disposed on the second leg 10122, and a third magnetic block 8 magnetically engaged with the second magnetic blocks 7 on the adjacent closing-in leg 1012 is disposed at the end of the secondary leg 10123; the third magnetic block 8 arranged at the tail end of the auxiliary supporting leg 10123 and the second magnetic block 7 arranged on the second supporting leg 10122 of the adjacent closing-in supporting leg 1012 are mutually matched and magnetically attracted and connected in the contracted state of the expandable distal end 101, and the second magnetic block 7 is separated from the third magnetic block 8 in the self-expanding state of the expandable distal end 101. The auxiliary supporting leg 10123 can be matched with the second magnetic block 7 on the side edge of the second supporting leg 10122, so that the binding effect is improved, and the auxiliary supporting leg 10123 is prevented from tilting in the binding state.

The working process of the invention comprises the following steps:

in the working process of the thrombus removing device for realizing the expandable distal end bundle opening by utilizing the bundle-collecting traction wire, the bundle-collecting wire 4 is inserted into or fixed on the expandable distal end 101 around a ring, the traction wire 3 is pulled to reduce the diameter of a ring formed by the bundle-collecting wire 4, so that the expandable distal end 101 is pressed, the expandable distal end 101 is in a pressed and held bundle-collecting state, and the thrombus is guided in a blood vessel to be close to a thrombus through a guide wire or other devices. After confirming the position, the pull wire 3 is released, allowing the catheter-expandable distal end 101 to naturally expand against the inner wall of the vessel. Further, the thrombus is retrieved into the catheter by aspiration through the catheter 1 using a manual aspiration device with a syringe or a mechanical automatic aspiration pump. After confirming that the thrombus has entered the catheter, the cinching guidewire is pulled again to place the catheter expandable distal end 101 in a crimped cinched state, withdrawing the catheter 1, and thereby retrieving the device as a whole.

The invention can be used with other auxiliary devices for removing thrombus, such as balloon dilation catheter, thrombus removing stent, etc., and the specific implementation process is as follows: the constriction wire 4 is inserted or looped over the expandable distal end 101, and pulling on the pulling wire 3 reduces the diameter of the loop formed by the constriction wire 4, thereby compressing the expandable distal end 101, placing the expandable distal end 101 in a crimped constriction, and guiding the vessel through a guidewire or other device to approach the thrombus. Auxiliary embolectomy tools such as drugs, embolectomy stents or balloon catheters can be threaded from within the catheter and delivered to the thrombus site. After confirming the position, the pull wire 3 is released, allowing the catheter-expandable distal end 101 to naturally expand against the inner wall of the vessel. Further, the thrombus is completely recovered in the catheter by sucking through the catheter by using a manual suction device with a syringe or a mechanical automatic suction pump. After confirming that the thrombus enters the catheter, the retraction and traction wire is pulled to enable the expandable distal end of the catheter to be in a press-holding state, and the catheter is retracted, so that the device is integrally recovered.

The above embodiments are illustrative of the present invention, and not limiting, and any simple modifications of the present invention fall within the scope of the present invention.

Claims

1. The utility model provides an utilize drawing silk of closing in to realize the thrombectomy device of expandable distal end bundle mouth, includes pipe (1), pipe (1) include pipe main part (102) and locate the expandable distal end (101) that have diameter expandable structure of pipe main part (102) distal end, expandable distal end (101) be by being close to pipe main part (102) end to keeping away from pipe main part (102) end diameter gradually increases's horn mouth shape, its characterized in that: the expandable distal end (101) is fixedly connected with the distal end of the catheter main body (102), a tow-collecting wire (4) for controlling the expandable distal end (101) to self-expand or press and shrink is arranged on the side wall of the expandable distal end (101), the tow-collecting wire (4) is arranged around the expandable distal end (101) and forms a ring matched with the expandable distal end (101) in shape, a traction wire (3) is fixedly connected to the tow-collecting wire (4), the traction wire (3) is axially arranged along the catheter (1), and the diameter of the ring is reduced by pulling the traction wire (3) to control the tow-collecting wire (4);

the expandable distal end (101) is of a net structure, and the binding wires (4) are inserted through holes of the net structure of the expandable distal end (101) and are slidably connected with the holes of the net structure; or the side wall of the expandable distal end (101) is provided with a plurality of annular channels (5) which are used for being matched with the convergent filaments (4), and the convergent filaments (4) are slidably connected with the annular channels (5).

2. A thrombolytic device for effecting inflation of an expandable distal stoma using a convergent traction filament as defined in claim 1, wherein: one end of the binding wire (4) is fixedly connected with the outer wall of the expandable distal end (101), and the other end of the binding wire is fixedly connected with the traction wire (3) after winding the expandable distal end (101).

3. A thrombolytic device for effecting inflation of an expandable distal stoma using a convergent traction filament as defined in claim 1, wherein: the traction wire (3) comprises a first traction wire (301) and a second traction wire (302), the tow collecting wire (4) is arranged around the expandable distal end (101), two ends of the tow collecting wire (4) are not fixedly connected with the expandable distal end (101), and two ends of the tow collecting wire (4) are fixedly connected with the first traction wire (301) and the second traction wire (302) respectively.

4. A thrombolytic device for effecting inflation of an expandable distal stoma using a convergent traction filament as defined in claim 1, wherein: both ends of the drawing wire (4) are fixedly connected with the expandable distal end (101), and the distal end of the traction wire (3) is connected with a non-end position on the drawing wire (4).

5. The embolectomy device of claim 4 for effecting an expandable distal stoma using a convergent pull wire, wherein: at least two traction wires (3) are arranged, and the number of the traction wires (3) is two.

6. A thrombolytic device for effecting inflation of an expandable distal stoma using a convergent traction filament as defined in claim 1, wherein: the catheter main body (102) further comprises a catheter outer layer (1021) sleeved on the outer wall of the catheter main body (102), and the traction wire (3) is slidably arranged between the catheter outer layer (1021) and the catheter main body (102).

7. A thrombolytic device for effecting inflation of an expandable distal stoma using a convergent traction filament as defined in claim 1, wherein: the catheter is characterized in that a hollow cavity is formed in the catheter body (102), and the traction wire (3) is slidably arranged in the hollow cavity in the catheter body (102).

8. A thrombolytic device for effecting inflation of an expandable distal stoma using a convergent traction filament as defined in claim 1, wherein: the annular channel (5) is made of a highly elastic material, and the annular channel (5) and the expandable distal end (101) are connected by gluing, welding or soldering.

9. A thrombolytic device for effecting inflation of an expandable distal stoma using a convergent traction filament as defined in claim 1, wherein: the expandable distal end (101) is provided with a snake-shaped spring (9) arranged around the outer wall or the inner wall of the expandable distal end, the snake-shaped spring (9) is in a closed loop shape fixedly connected end to end, and the snake-shaped spring (9) is arranged at a ring part, which is formed on the expandable distal end (101) and is close to the converging wire (4).

10. A thrombolytic device for effecting inflation of an expandable distal stoma using a convergent traction filament as defined in claim 1, wherein: a plurality of closing-in supporting legs (1012) which extend towards the end far away from the catheter main body (102) are arranged at one end far away from the catheter main body (102) on the expandable distal end (101), first magnetic attraction blocks (6) which can be mutually magnetically attracted and matched are arranged at one end far away from the catheter main body (102) on the closing-in supporting legs (1012), and the first magnetic attraction blocks (6) on the closing-in supporting legs (1012) can be mutually matched and magnetically attracted and connected in a contracted state of the expandable distal end (101); the first magnetic attraction blocks (6) on the closing-in support legs (1012) can be separated from each other in the self-expanding open state of the expandable distal end (101).

11. A thrombolytic device for effecting inflation of an expandable distal stoma using a convergent traction filament as defined in claim 10, wherein: the far end of the closing-in supporting leg (1012) has a tendency of bending towards the axis side far away from the expandable far end (101), and the suction force between the first magnetic attraction blocks (6) is smaller than the elastic restoring force of self-expansion of the expandable far end (101).

12. A thrombolytic device for effecting inflation of an expandable distal stoma using a convergent traction filament as defined in claim 10, wherein: the surface of the first magnetic attraction block (6) is provided with a developing mark.

13. A thrombolytic device for effecting inflation of an expandable distal stoma using a convergent traction filament as defined in claim 10, wherein: the closing-in support leg (1012) comprises a first support leg (10121) and a second support leg (10122) which are arranged on two sides of the first magnetic attraction block (6), and a plurality of auxiliary support legs (10123) extending towards two sides are arranged in the middle section of the first support leg (10121) and/or the second support leg (10122).

14. A embolectomy device for effecting an expandable distal stoma using a convergent pull wire as recited in claim 13, wherein: the auxiliary supporting leg (10123) is arranged on the first supporting leg (10121), a plurality of second magnetic blocks (7) are arranged on the second supporting leg (10122), and a third magnetic block (8) which is in magnetic attraction fit with the second magnetic blocks (7) on the adjacent closing-in supporting leg (1012) is arranged at the tail end of the auxiliary supporting leg (10123); the expandable distal end (101) is in a contracted state, the third magnetic block (8) arranged at the tail end of the auxiliary supporting leg (10123) is mutually matched with the second magnetic block (7) arranged on the second supporting leg (10122) adjacent to the closing-in supporting leg (1012), the second magnetic block (7) is separated from the third magnetic block (8) in a self-expanding state of the expandable distal end (101).