CN114522004A

CN114522004A - Delivery device and blood flow guiding stent system

Info

Publication number: CN114522004A
Application number: CN202210086477.0A
Authority: CN
Inventors: 黄浩金; 张�杰
Original assignee: Juhui Medical Technology Shenzhen Co ltd
Current assignee: Juhui Medical Technology Shenzhen Co ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-05-24

Abstract

The invention discloses a conveying device for conveying a blood flow guide support, which comprises a conveying guide wire and a pushing rod connected with the conveying guide wire, wherein a ribbon is arranged at the far end of the conveying guide wire, the ribbon comprises a body, and a fixed end and a free end which are respectively positioned at the two ends of the body, the fixed end is fixed with the conveying guide wire, the body is wound at the far end of the blood flow guide support along the direction from the far end to the near end during conveying, and after the blood flow guide support is released, the body can be unscrewed, and the extending direction of the body is opposite to the winding direction. Above-mentioned conveyor, the ribbon can wrap up the distal end of blood flow guide holder, can prevent that the braided wire of the distal end of blood flow guide holder and little catheter inner wall from taking place to cut and rub and causing the circumstances such as the damage of little catheter inner wall and the braided wire of blood flow guide holder distal end turns over and gets in touch, can also avoid the unable circumstances of opening or carrying the unable withdrawal of seal wire of the distal end of blood flow guide holder. The present application further relates to a blood flow directing stent system.

Description

Delivery device and blood flow guiding stent system

Technical Field

The invention relates to the technical field of medical instruments, in particular to a conveying device and a blood flow guide support system.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

The current incidence rate of intracranial aneurysms is about 3% -5%, the probability of aneurysm rupture per year in patients is about 0.95%, once the aneurysm ruptures to cause subarachnoid hemorrhage, the mortality rate is as high as 40%, so that manual intervention before the intracranial aneurysm ruptures is performed is very important to prevent the aneurysm from rupturing. At present, there are many methods for manually intervening aneurysm rupture, which are often interventional operations, and intracranial aneurysm interventional treatment is proved to be a safer and more reliable method for treating intracranial aneurysm.

The principle of treating intracranial aneurysm through the blood flow guiding bracket is that the blood flow guiding bracket is conveyed to an aneurysm lesion part in a micro-catheter through a femoral artery puncture device, the blood flow guiding bracket is released from the micro-catheter, and the blood flow guiding bracket can cover the neck of the aneurysm, reduce the blood flow flowing into the aneurysm body and induce the formation of thrombus in the aneurysm body by utilizing the compactness characteristic of meshes of the blood flow guiding bracket, so that the aim of reducing the blood flow pressure in the aneurysm body and further treating the aneurysm is fulfilled. Compared with the currently used spring ring tumor filling treatment method, the spring ring tumor filling treatment method has obvious advantages, reduces problems such as spring ring falling and the like which can be brought by long term, and has obvious advantages for treating wide and large aneurysms.

The principle of conveying the blood flow guide support by the current blood flow guide support conveying device is mainly that the blood flow guide support is conveyed by means of friction force, the blood flow guide support is sleeved on a silica gel block with high elasticity and high friction coefficient on the conveying device, then the blood flow guide support and the conveying device are together arranged in a guide-in sheath with a diameter smaller than that of the blood flow guide support, the blood flow guide support and the silica gel block are mutually extruded in a sheath tube to generate friction force, and the friction force between the outer side of the blood flow guide support and the inner wall of the guide-in sheath tube is smaller than the friction force generated by mutual extrusion between the inner side of the blood flow guide support and the silica gel block, so that the blood flow guide support and the silica gel block are forced to be in a relatively static state in the conveying process, and the purpose of conveying the blood flow guide support can be achieved by pushing the conveying device. Then the blood flow guide stent is conveyed into the micro catheter from the inside of the guiding sheath through the matching of the connecting piece on the micro catheter and the guiding sheath, the principle of the blood flow guide stent conveying in the micro catheter is the same as that in the guiding sheath, because the inner diameter of the guiding sheath is consistent with that of the micro catheter, and finally the blood flow guide stent releases the stent after conveying the stent to a lesion site in the micro catheter. However, there are many problems with the delivery devices currently on the market for stent delivery, such as:

prior art blood flow directing stents are typically woven from multiple strands of wire resulting in a blood flow directing stent having multiple loose wire ends at the ends. In the process of pushing the blood flow guide bracket by the microcatheter, the wire head can scratch the inner wall of the microcatheter, so that the blood flow guide bracket and the inner wall of the microcatheter are greatly rubbed, the far end of the blood flow guide bracket is greatly damaged, the blood flow guide bracket can be deformed, and the normal release of the blood flow guide bracket is influenced.

The guide wire is carried to pipeline on the market at present, its distal end is provided with the protection device who is used for the protective cradle distal end, in blood flow guide support transportation process, blood flow guide support's distal end is through carrying two semicylinder protective sheaths protections that set up on the guide wire, blood flow guide support is when the release, two semicylinder protective sheaths are opened, blood flow guide support release back, two semicylinder protective sheaths are whole to be withdrawn back to in the microcatheter with 180 upsets, the space that the protective sheath was opened and is overturn needs is great, when meetting less blood vessel, the release that influences blood flow guide support can's unable effective opening of protective sheath appears, or when withdrawing the transport guide wire, the protective sheath can't overturn and get into in the microcatheter, if the transport guide wire of forced withdrawal can cause serious medical accident such as protective sheath fracture.

Disclosure of Invention

The present invention has been made to solve at least one of the above-mentioned problems. The purpose is realized by the following technical scheme:

the embodiment of the application provides a conveying device, and this conveying device is used for carrying blood flow guide support, including carry the seal wire and with the push rod that carries the seal wire to connect, the distal end of carrying the seal wire is provided with the ribbon, the ribbon includes the body and is located respectively the stiff end and the free end at body both ends, the stiff end with carry the seal wire fixed, during the transport, the body is in blood flow guide support's distal end is twined along distal end to near-end direction blood flow guide support releases the back, the body can despin just the extending direction and the winding direction of body are opposite.

According to the conveying device provided by the embodiment of the application, in the conveying process, the far end of the blood flow guide support can be wrapped by the ribbon, so that the situations that the inner wall of the micro catheter is damaged due to rubbing between the braided wires at the far end of the blood flow guide support and the inner wall of the micro catheter, the braided wires at the far end of the blood flow guide support are reversely bent and hooked and the like can be prevented, and the safety of the operation is influenced; when the blood flow guide support releases, the ribbon can be automatically unscrewed and turned, the space required by turning is small, the condition that the far end of the blood flow guide support cannot be opened or the conveying guide wire cannot be retracted can be avoided, the ribbon cannot be blocked at the pipe orifice of the micro-catheter after turning, and the recovery process is smooth.

In addition, according to the embodiment of the invention, the following additional technical characteristics can be provided:

in one embodiment, the body has a width of 0.2mm to 3mm and a thickness of 0.01mm to 0.1 mm.

In one embodiment, the body is shaped to form a helical tower-like structure of increasing diameter from the fixed end to the free end.

In one embodiment, the pitch of the body is 2mm-5mm, the number of turns of the spiral is 2-5 turns, and the diameter of the opening end is 2mm-6 mm.

In one embodiment, the conveying device further includes a first sleeve and a second sleeve, the first sleeve and the second sleeve are both sleeved on the conveying guide wire, the fixed end is inserted into the first sleeve, and the second sleeve and the first sleeve are fixed to compress the ribbon.

In one embodiment, the proximal end face of the second sleeve and the distal end face of the first sleeve abut one another to compress the flag.

In one embodiment, the first sleeve and the second sleeve are secured in a nesting manner to compress the flag.

In one embodiment, the proximal end of the second sleeve is of a tapered configuration.

In one embodiment, the conveying device further comprises a developing spring coil and an embedded spring, the developing spring coil and the embedded spring are both sleeved on the conveying guide wire, the fixed end of the ribbon is wound on the embedded spring, and the embedded spring and the fixed end are inserted into the developing spring coil and fixed at the near end of the developing spring coil.

The application still provides a blood flow guide support system, including above-mentioned arbitrary conveyor, still include blood flow guide support, blood flow guide support cover is located carry the seal wire, the ribbon winding is in blood flow guide support's distal end.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic view of a blood flow directing stent system within a microcatheter according to a first embodiment of the present invention;

FIG. 2 is a schematic view of the blood flow directing stent of FIG. 1;

FIG. 3 is a schematic structural view of the conveying apparatus shown in FIG. 1;

FIG. 4 is a schematic structural view of the flag shown in FIG. 3;

FIG. 5 is an exploded view of the first sleeve, the second sleeve and the flag shown in FIG. 3;

FIG. 6 is a schematic view of the configuration of the blood flow directing stent system within the loading tube;

FIG. 7 is a schematic view of the insertion of the blood flow directing stent system loaded into the loading tube into the microcatheter;

FIG. 8 is a schematic view of a semi-released configuration of a blood flow directing stent in a blood flow directing stent system;

FIG. 9 is a schematic view of the fully released blood flow directing stent of the blood flow directing stent system;

FIG. 10 is a schematic view of a portion of a second embodiment of the delivery device of the present invention;

FIG. 11 is an exploded view of the first sleeve and the second sleeve shown in FIG. 10;

fig. 12 is a partial structural view of a conveying device according to a third embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that, in the present application, a range represented by "one numerical value to another numerical value" is a general expression avoiding all numerical values in the range from being recited in the specification. Thus, recitation of a range of values herein is intended to encompass any value within the range and any smaller range defined by any value within the range, as if the range and smaller range were explicitly recited in the specification.

In the present application, the end closer to the operator in use is referred to as the "proximal end", the end farther from the operator is referred to as the "distal end", and the "proximal end" and the "distal end" of any component of the delivery device are defined according to this principle.

Referring to fig. 1, a blood flow guiding stent system 10 according to an embodiment of the present application includes a blood flow guiding stent 100 and a delivery device 200, the blood flow guiding stent 100 is sleeved on the delivery device 200, and the delivery device 200 is used for delivering the blood flow guiding stent 100 to a lesion site.

Referring also to fig. 2, the blood flow directing stent 100 is woven from a plurality of wires to form a luminal structure. In one embodiment, the blood flow guiding stent 100 is woven from 48 or 64 strands of metal wires, the weaving is one-to-one or two-to-two, the metal wires may be made of nitinol, cobalt-chromium alloy, platinum or their alloys, or a composite structure formed by wrapping a developing wire with a metal wire having a wire diameter of 0.0010 to 0.0016 inches. During conveying, the blood flow guiding bracket 100 is sleeved at the far end of the conveying device 200 and compressed into a straightened state, and after release, the blood flow guiding bracket 100 can be restored to a state matched with the blood vessel and attached to the inner wall of the blood vessel.

Referring to fig. 3, the delivery device 200 includes a delivery wire 210 and a pushing rod 220 connected to the delivery wire 210, wherein a proximal end of the delivery wire 210 is fixedly connected to a distal end of the pushing rod 220, for example, by welding.

In one embodiment, the pushwire 210 is made of nitinol or stainless steel. The pushwire 210 is a tapered wire, and the diameter of the pushwire 210 decreases in the proximal to distal direction. In one embodiment, the delivery guidewire 210 has a largest diameter end with a diameter of 0.1mm to 0.2mm and a smallest diameter end with a diameter of 0.03mm to 0.1 mm.

With continued reference to fig. 3, the delivery device 200 further includes a visualization spring coil 230 disposed at the distal end of the delivery guidewire 210, wherein the visualization spring coil 230 is sleeved at the end of the delivery guidewire 210 with the smaller diameter. In one embodiment, the contrast spring coil 230 is secured to the distal end of the delivery guidewire 210 by welding, soldering, or the like, or by bonding with a polymeric biocompatible material. In one embodiment, the developing spring coil 230 is formed by winding a metal wire capable of developing under X-ray, such as platinum-tungsten wire or platinum wire, the diameter of the metal wire wound around the developing spring coil 230 is 0.033mm to 0.1mm, and the diameter of the developing spring coil 230 is 0.2mm to 0.4 mm. By developing the spring coil 230, it is possible to judge the position where the most distal end of the delivery device 200 is located in the body.

Referring to fig. 1 and 3, the delivery device 200 further includes a silica gel block 240 disposed at the proximal end of the delivery guide wire 210, the silica gel block 240 is sleeved on the proximal end of the delivery guide wire 210, and when loading, the proximal end of the blood flow guiding stent 100 is sleeved on the silica gel block 240. In one embodiment, the silica gel block 240 has a two-layer structure, the inner layer is a circular tube made of polymer, the circular tube is made of polypropylene, polyimide, etc., the inner layer 240 is sleeved on the conveying guide wire 210, the outer layer is made of silica gel, the inner diameter of the inner circular tube is 0.16mm-0.25mm, the outer diameter is 0.3mm-0.4mm, the outer diameter is 0.55mm-0.60mm, the inner diameter of the outer layer is determined according to the outer diameter of the inner layer, and the length of the silica gel block 240 is 2mm-4 mm.

With reference to fig. 3, the delivery device 200 further includes a proximal developing sleeve 250 and a distal developing sleeve 260, which are sleeved on the proximal end of the delivery guide wire 210, the proximal end of the silica gel block 240 of the distal developing sleeve 250 abuts against the proximal end of the distal developing sleeve 260, the distal end of the proximal silica gel block 240 of the distal developing sleeve 260 abuts against the distal end of the pushing rod 220, the proximal developing sleeve 250 can prevent the silica gel block 240 from moving reversely when delivering the blood flow guiding stent 100, and the proximal developing sleeve 250 can be used to abut against the proximal end of the blood flow guiding stent 100 and to develop and position the position of the proximal end of the blood flow guiding stent 100.

The proximal and

distal imaging cannulas

250, 260 are made of a developable metallic material, such as platinum, tungsten, gold, silver, tantalum, nitinol, cobalt-chromium alloy, platinum-tungsten alloy, platinum-iridium alloy, etc. In one embodiment, the proximal developer sleeve 250 is a hollow cylindrical structure with an outer diameter of 0.3mm to 0.6mm and a length of 2mm to 5 mm. In one embodiment, the proximal end of the distal developer sleeve 260 is also a hollow cylindrical structure having a length of 1mm to 3mm, and the distal end is a hollow conical structure having a length of 1mm to 3 mm. The distal end of the distal imaging sleeve 260 is secured to the delivery guidewire 210 by soldering. With the proximal and

distal visualization sleeves

250, 260, it can be determined whether the proximal end of the blood flow directing stent 100 is completely on the silicone block 240 under DSA, which can help to see whether the blood flow directing stent 100 is displaced relative to the delivery device 200. When loaded, the proximal end of the blood flow directing stent 100 extends beyond the silicone block 240 and overlies the proximal visualization cannula 250.

The push rod 220 is made of nickel-titanium alloy or stainless steel, and the outer diameter is 0.4mm-0.6 mm. With continued reference to FIG. 3, the push rod 220 includes a distal portion 221 and a proximal portion 222 coupled to the distal portion 221, the distal portion 221 being coupled to the delivery guidewire 210. In one embodiment, the distal portion 221 is laser engraved with nitinol or stainless steel tubing to form a helical hollow, the pitch of the helix increasing from the distal end to the proximal end. The nitinol or stainless steel tube of the distal segment 221 is further provided with a heat-shrinkable tube, such as a PTFE (polytetrafluoroethylene) heat-shrinkable tube, which can protect the spiral hollow-out grooves and prevent the distal segment 221 from being straightened due to an excessive force. The proximal section 222 includes a nitinol or stainless steel tube integrally formed with the distal section 221 and a solid steel wire inserted into the nitinol or stainless steel tube, so that the proximal section 222 has greater support strength and is not easily broken when pushed. The pushing rod 220 has the advantages that the flexibility of the far-end section 221 is good, the pushing rod can penetrate through a bent blood vessel, the supporting force of the near-end section 222 is good, and a good pushing effect can be achieved. In one embodiment, the push rod 220 has an overall length of 1.5m to 2.0m, wherein the distal section 221 has a length of 70mm to 120 mm.

Referring to fig. 1, 3 and 4, the distal end of the delivery guidewire 210 is provided with a streamer 270. The flap 270 includes a body 271, and a fixed end 272 and a free end 273 respectively located at two ends of the body 271, the fixed end 272 is fixed with the delivery guide wire 210, during delivery, the body 271 is wound along a direction from the distal end to the proximal end at the distal end of the blood flow guide stent 100, after the blood flow guide stent 100 is released, the body 271 can be unscrewed, and the extending direction of the body 271 is opposite to the winding direction, that is, during delivery, the fixed end 272 is closer to the distal end than the free end 273, and after the release, the free end 273 is closer to the distal end than the fixed end 272.

Through the arrangement of the ribbons 270, in the conveying process of the blood flow guide support 100, the ribbons 270 can guide the blood flow to the far end of the support 100, and the far end of the blood flow guide support 100 can be avoided from directly contacting with the inner wall of the micro catheter, so that the possibility that the far end of the blood flow guide support 100 scratches the inner wall of the micro catheter to damage the inner wall of the micro catheter is reduced, and meanwhile, when the blood flow guide support 100 is released, the radial supporting force of the blood flow guide support 100 and the impact force of the blood flow can help the ribbons 270 to be unrotated, and the ribbons 270 extend along the blood flow direction under the impact force of the blood flow, the space required for opening and overturning the ribbons 270 is small, and the occurrence rate that the blood flow guide support cannot be released or guide wires cannot be recycled can be reduced.

The material of the ribbon 270 is PTFE material or other soft materials with good biocompatibility. In one embodiment, referring to fig. 4, the thickness of the body 271 of the flap 270 is 0.01mm to 0.1mm, so that the flap 270 is wound around the blood flow guiding support 100 without affecting the difficulty of sheathing and pushing the blood flow guiding support 100 due to an excessive thickness, and the space required for turning over the flap 270 is smaller. In one embodiment, 271 is 0.03mm to 0.08mm thick. In one embodiment, the width d of the body 271 is 0.2mm-3mm, which can make the blood flow contact with the body 271 in a larger area, thereby facilitating the unwinding and the turning of the body 271. In one embodiment, the width d of the body 271 is 0.5mm-2 mm. In one embodiment, the body 271 is shaped to form a helical tower-like structure with a diameter that gradually increases from the fixed end 272 to the free end 273, which facilitates loading of the blood flow directing stent 100. In one embodiment, the pitch p of the body 271 is 2mm to 5mm, the number of turns of the helix is 2 to 5, and the diameter D of the open end is 2mm to 6mm, i.e., the diameter of the end near the free end 273 is 2mm to 6mm, so that the body 271 can be unscrewed and turned over quickly. In one embodiment, the length of the body 271 wrapped at the distal end of the blood flow guiding stent 100 is 2mm to 3mm, the body 271 can better protect the distal end of the blood flow guiding stent 100, and meanwhile, the body 271 can be smoothly unscrewed, thereby avoiding the influence on the self-expansion of the blood flow guiding stent 100.

It should be noted that the ribbon 270 may not be shaped, i.e. it is a strip in a natural state, and when assembled with the blood flow guiding stent 100, it is wound around the distal end of the blood flow guiding stent 100.

With reference to fig. 3 and fig. 5, the conveying device 100 further includes a first sleeve 280 and a second sleeve 290, the first sleeve 280 and the second sleeve 290 are both sleeved on the conveying guide wire 210, the fixed end 272 is inserted into the first sleeve 280, and the second sleeve 290 and the first sleeve 280 are fixed to compress the ribbon 270. In one embodiment, the securing end 272 is inserted into the first sleeve 280 such that the body 271 extends from the proximal end of the first sleeve 280 and then over the delivery guidewire 210, and the distal end of the second sleeve 290 is secured to the proximal end of the first sleeve 280 to secure the flag 270 between the first sleeve 280 and the second sleeve 290. In one embodiment, the first sleeve 280 is a hollow cylindrical structure with an outer diameter of 0.3mm to 0.4mm and an inner diameter of 0.2mm to 0.25mm, the first sleeve 280 is located at the proximal end of the developing spring coil 230, and the distal end of the first sleeve 280 abuts against the proximal end of the developing spring coil 230. The distal end of the second sleeve 290 is also a hollow cylinder, with a length of 1mm to 2mm, an outer diameter of 0.3mm to 0.4mm, and an inner diameter of 0.20mm to 0.25mm, and the distal end face of the second sleeve 290 and the proximal end face of the first sleeve 280 abut against each other to secure the flag 270. The first sleeve 280 and the second sleeve 290 can be fixed on the delivery guidewire 210 by welding, and the fixed end 271 can be fixed in the first sleeve 280 by glue dispensing. In one embodiment, the proximal end of the second sleeve 290 is tapered to facilitate easier retrieval of the delivery guidewire 210 into the microcatheter. In one embodiment, the proximal taper of the second sleeve 290 has a length of 1mm to 2 mm.

Referring to fig. 1, 6-9, an embodiment of the present application further provides a method of operating the blood flow guiding stent system 10. The blood flow directing stent system 10 also includes a loading catheter 20.

Step S11: the delivery device 200 is threaded into the loading catheter 20 with the loading catheter 20 in place of the pusher arm 220, and the blood flow directing stent 100 is then threaded through the delivery guidewire 210, wrapping the flap 270 around the distal end of the blood flow directing stent 100, and gradually pulling the blood flow directing stent 100 into the loading tube 20. Fig. 6 is a schematic view of the blood flow directing stent system 10 loaded into the loading tube 20.

Step S12: loading tube 20 is inserted into microcatheter 30 (at which time microcatheter 30 has reached the lesion), delivery device 200 is advanced, and blood flow is directed to stent 100 and advanced into microcatheter 30. Fig. 7 is a schematic view of the structure of the blood flow guiding stent system 10 loaded with the loading catheter 20 inserted into the micro-catheter 30, and fig. 1 is a schematic view of the structure of the blood flow guiding stent system 10 located in the micro-catheter 30.

Step S13: pushing the delivery device 200 until the distal end of the blood flow guiding stent 100 reaches the distal end of the micro-catheter 30, withdrawing the micro-catheter 30 and pushing the delivery device 200 when the blood flow guiding stent 100 is properly released, so that the ribbons 270 and the distal ends of the blood flow guiding stent 100 are exposed outside the micro-catheter 30, the radial support force of the blood flow guiding stent 100 and the impact force of the blood flow can help the ribbons 270 to unravel, and the ribbons 270 extend in the blood flow direction under the impact force of the blood flow. Fig. 8 is a partially released configuration of the blood flow directing stent 100 when the flag 270 has been unwound and inverted.

Step S14: continued advancement of delivery device 200 releases blood flow directing stent 100 completely, simultaneously withdrawing delivery device 200 into microcatheter 30 and withdrawing microcatheter 30 out of the body along with delivery device 200. Fig. 9 is a schematic view of the delivery device 200 retracted into the microcatheter 30 after the blood flow directing stent 100 is fully released.

In the blood flow guiding stent system 10, in the conveying process, the ribbon 270 can wrap the distal end of the blood flow guiding stent 100, so that the situation that the inner wall of the micro catheter 30 is damaged due to the rubbing of the braided wires at the distal end of the blood flow guiding stent 100 and the inner wall of the micro catheter 30, the braided wires at the distal end of the blood flow guiding stent 100 are reversely bent and hooked and the like can be prevented, and the operation safety is influenced; when the blood flow guide support 100 releases, the ribbon 270 can be automatically unscrewed and turned, the space required for turning is small, the situation that the far end of the blood flow guide support 100 cannot be opened or the delivery guide wire 210 cannot be retracted can be avoided, and meanwhile, the ribbon 270 cannot block the pipe orifice of the micro-catheter 30 after turning, so that the recovery process is smooth.

Referring to fig. 10, a conveying device 200a according to a second embodiment of the present application has substantially the same structure as the conveying device 200 according to the first embodiment, and the difference is mainly that: the first sleeve 280a is secured in a nesting manner with the second sleeve 290a to compress the flag 271 a. Referring to fig. 10 and 11, the first sleeve 280a has a cylindrical structure, an outer diameter of 0.3mm to 0.4mm and a length of 3mm to 6 mm. The distal lumen of the first sleeve 280a is cylindrical with an inner diameter of 0.10mm to 0.25mm, and the proximal lumen of the first sleeve 280a is tapered with a taper length of 0.5mm to 1 mm. The two ends of the second sleeve 290a are cone-shaped structures, the length of the cone-shaped structures is 1mm-2mm, the middle part is a cylindrical structure, the outer diameter of the cylindrical structure is 0.3mm-0.4mm, the inner cavity of the second sleeve 290a is a cylindrical structure, and the inner diameter is 0.1mm-0.25 mm. In use, the fixed end (not shown, hidden) of the flag 270a is inserted into the inner cavity of the first sleeve 280a and the flag 270a is fixed with the inner cavity of the first sleeve 280a by using a glue with good biocompatibility, then the first sleeve 280a together with the flag 270a is inserted onto the delivery guide wire 210a and fixed on the delivery guide wire 210a, then the distal end of the second sleeve 290a is inserted into the proximal inner cavity of the first sleeve 280a, and then the first sleeve 280a and the second sleeve 290a are fixed by welding or using a glue with good biocompatibility. The first sleeve 280a is secured to the second sleeve 290a in a nested manner to avoid the risk of pinching the flag 270a apart.

It should be noted that the shape of the proximal lumen of the first sleeve 280a and the shape of the distal end of the second sleeve 290a may be other shapes, so long as it is ensured that the proximal lumen of the first sleeve 280a matches the shape of the distal end of the second sleeve 290 a.

The blood flow guiding stent system of the second embodiment of the present application has substantially the same structure as the blood flow guiding stent system of the first embodiment, and mainly differs therefrom in that: the blood flow guiding stent system of the second embodiment employs the delivery device 200a of the second embodiment.

Referring to fig. 12, the structure of the conveying device 200b according to the third embodiment of the present application is substantially the same as that of the conveying device 200 according to the first embodiment, and the differences mainly lie in that: the feeding device 200b includes an embedded spring 275, the inner cavity spring 275 is sleeved on the feeding guide wire 210b, the fixed end 272b of the ribbon 270b is wound around the inner cavity spring 275, and the embedded spring 275 and the fixed end 272b are inserted into the developing spring coil 230b and fixed at the near end of the developing spring coil 230 b. In one embodiment, fixed end 272b is wound 15-20 turns around innerspring 275, with innerspring 275 having a length of 4mm-6 mm. In one embodiment, the embedded spring 275 is formed by winding stainless steel wire having a wire diameter of 0.01mm to 0.03mm, and the embedded spring 275 has a diameter of 0.15mm to 0.20 mm. In one embodiment, the embedded spring 275, the fixing end 272b and the developing spring coil 230b are fixed by dispensing with a biocompatible glue. Since the embedded spring 275 is formed by winding, the surface is rough, so that the frictional force between the embedded spring 275 and the developing spring coil 230b is large, and the fixed end 272b is not easily detached from between the embedded spring 275 and the developing spring coil 230 b. The embedded spring 275 may also increase the strength of the proximal end of the visualization spring coil 230b, reducing the likelihood that the proximal end of the visualization spring coil 230b will be pulled apart by the delivery guidewire.

The blood flow guiding stent system of the third embodiment of the present application has substantially the same structure as the blood flow guiding stent system of the first embodiment, and mainly differs therefrom in that: the blood flow directing stent system of the third embodiment employs the delivery device 200b of the second embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a conveying device for carry blood flow guide holder, including carry the seal wire and with carry the push rod that the seal wire is connected, its characterized in that, the distal end of carrying the seal wire is provided with the ribbon, the ribbon includes the body and is located respectively the stiff end and the free end at body both ends, the stiff end with it is fixed to carry the seal wire, during the transport, the body is in the distal end of blood flow guide holder is twined along distal end to the direction of near-end blood flow guide holder release back, the body can unscrew just the extending direction and the winding direction of body are opposite.

2. The delivery device of claim 1, wherein the body has a width of 0.2mm to 3mm and a thickness of 0.01mm to 0.1 mm.

3. The delivery device of claim 1, wherein the body is shaped to form a helical tower-like structure of increasing diameter from the fixed end to the free end.

4. A delivery device according to claim 3, wherein the body has a pitch of 2mm to 5mm, a number of turns of the helix of 2 to 5 turns, and an open end of 2mm to 6mm diameter.

5. The conveying device as claimed in claim 1, further comprising a first sleeve and a second sleeve, wherein the first sleeve and the second sleeve are both sleeved on the conveying guide wire, the fixing end is inserted into the first sleeve, and the second sleeve and the first sleeve are fixed to compress the ribbon.

6. The delivery device of claim 5, wherein the proximal end face of the second sleeve and the distal end face of the first sleeve abut one another to compress the flag.

7. The delivery device of claim 5, wherein the first sleeve and the second sleeve are secured in a nested manner to compress the flag.

8. The delivery device of claim 1, wherein the proximal end of the second sleeve is of a tapered configuration.

9. The conveyance device according to claim 1, further comprising a developing spring coil and an embedded spring, wherein the developing spring coil and the embedded spring are both sleeved on the conveyance guide wire, the fixed end of the ribbon is wound around the embedded spring, and the embedded spring and the fixed end are inserted into the developing spring coil and fixed at a proximal end of the developing spring coil.

10. A blood flow directing stent system comprising the delivery device of any one of claims 1-9, further comprising a blood flow directing stent, wherein the blood flow directing stent is sleeved over the delivery guidewire, and wherein the streamers are wrapped around the distal end of the blood flow directing stent.