阅读说明：本技术 输送装置 (Conveying device ) 是由 黄辉 王高波 陈文兆 韦秋娟 于 2021-04-12 设计创作，主要内容包括：本申请涉及一种输送装置,其包括输送外管及第一输送内管。第一输送内管插设于输送外管内,并固定于输送外管的内壁,第一输送内管的远端端面伸出输送外管,第一输送内管包括第一管体及设置于第一管体近端的第一连接件,第一管体与输送外管的内壁固定连接,第一连接件用于在回收过程中与抽吸装置连接。上述输送装置,在使用过程中,不需要两端切换,简化了器械的操作,而且回收过程中,第一输送内管的近端连接抽吸装置,抽吸装置可以捕获从栓塞保护器中逃逸出来的栓子,从而防止从栓塞保护器逃逸的栓子流向远端血管而造成远端血管的栓塞,提高手术安全性。(The application relates to a conveying device, which comprises an outer conveying pipe and a first inner conveying pipe. The first conveying inner pipe is inserted into the conveying outer pipe and fixed on the inner wall of the conveying outer pipe, the far end face of the first conveying inner pipe extends out of the conveying outer pipe, the first conveying inner pipe comprises a first pipe body and a first connecting piece arranged at the near end of the first pipe body, the first pipe body is fixedly connected with the inner wall of the conveying outer pipe, and the first connecting piece is used for being connected with a suction device in the recycling process. Above-mentioned conveyor, in the use, do not need both ends to switch, simplified the operation of apparatus, retrieve the in-process moreover, the near-end connection suction device of first transport inner tube, suction device can catch the embolus of escaping from the embolism protector to the embolus that prevents to escape from the embolism protector flows to distal end blood vessel and causes the embolism of distal end blood vessel, improves the operation security.)

1. A conveyor apparatus, comprising:

a delivery outer tube, and

the first conveying inner pipe is inserted into the conveying outer pipe and fixed on the inner wall of the conveying outer pipe, and the distal end face of the first conveying inner pipe extends out of the conveying outer pipe;

the conveying device further comprises a second conveying inner pipe, the second conveying inner pipe is used for conveying and recovering the embolism protector, the second conveying inner pipe and the first conveying inner pipe are arranged side by side, the second conveying inner pipe is inserted into the conveying outer pipe and fixed on the inner wall of the conveying outer pipe, the inner diameter of the first conveying inner pipe is smaller than that of the second conveying inner pipe, the far end face of the second conveying inner pipe is located in the conveying outer pipe, and the axial distance between the far end face of the second conveying inner pipe and the far end face of the conveying outer pipe is 10-20 mm.

2. The conveying device as claimed in claim 1, wherein the portion of the first conveying inner pipe extending out of the conveying outer pipe is provided with an inclined hole, and the inclined hole is arranged at one side close to the center of the conveying outer pipe.

3. The conveying device according to claim 2, wherein the diameter of the inclined hole is not more than 0.5mm, and the included angle between the central line of the inclined hole and the extending direction of the first conveying inner pipe is 30-60 degrees.

4. The delivery device of claim 2, wherein the distal end of the first inner delivery tube is a closed structure.

5. The delivery device of claim 1, wherein the length of the first inner delivery tube extending out of the outer delivery tube is 2mm to 10 mm.

6. The delivery device of claim 1, wherein the outer delivery tube, the first inner delivery tube, and the second inner delivery tube are all circular in cross-section.

7. The conveying device according to claim 1, wherein a distal end of the conveying outer tube is provided with a developing ring, and the developing ring is arranged on a distal end face of the conveying outer tube.

8. The delivery device of claim 1, wherein the first inner delivery tube comprises a first tube body and a first connector disposed at a proximal end of the first tube body, the first tube body being secured to an inner wall of the outer delivery tube, the first connector being configured to connect to a suction device during a recovery procedure.

9. The conveying device as claimed in claim 1, wherein the first conveying inner pipe is a plurality of pipes, and the plurality of pipes are fixed on the inner wall of the conveying outer pipe.

10. The delivery device of claim 1, wherein the first inner delivery tube comprises, from outside to inside, a first outer layer and a first inner layer, the first inner layer being coaxially disposed inside the first outer layer.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a conveying device.

Background

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

At present, the cardiovascular and cerebrovascular interventional therapy modes, such as balloon expansion, rotary cutting of vascular plaques, stent expansion, valve operation and the like, generate emboli in the operation process. These emboli are intravascular masses that can enter stenotic vessels in the direction of blood flow and cause blockage of vessels in distal body parts, for example in valve repair or replacement surgery where manipulation of a calcified valve can cause migration of calcified material, tissue particles and other debris that may form into masses and thus emboli. Emboli if located in the heart, aorta or brain, emboli can cause infarction in any part of the body, embolic debris can migrate through the circulatory system and cause vascular occlusion, blood clots and cerebrovascular accidents, as well as stroke, possibly leading to cerebral infarction, myocardial infarction, pulmonary embolism, and even death. One way to reduce these complications is to place an embolic protector downstream of the surgical treatment site, to capture any emboli that may occlude the vessel, such as plaque, thrombus, etc., that have fallen off during the surgical procedure, and to protect the distal stenosed vessel from occlusion. Meanwhile, once the embolus is captured, the embolus protector has the risk of the embolus falling off in the process of recovering the sheath tube and leaving the body of the patient, so that new vascular embolism is caused, and the operation risk is increased.

Products of existing embolic protection devices can be divided into suction-type devices and screen-type devices. The suction device occludes a far-end blood vessel by using an expansion balloon, and emboli and plaques are sucked out through a suction catheter after an operation, so that blood vessel embolism is avoided, but the mode can cause blood vessel ischemia, and the operation risk is increased; the filter screen type device is used for placing the filter screen in a far-end blood vessel to block emboli and plaque from flowing to a narrow blood vessel at the tail end, and then the filter with the emboli is recycled through the recycling catheter, so that the blood flow is not blocked, and the application is wide.

The embolic protection device needs to be placed at the far end of a lesion position before an interventional operation, a delivery device in the prior art can simultaneously realize a delivery function and a recovery function, please refer to fig. 1, the embolic protection device 21 comprises a guide wire 22 and a filter screen 23 arranged on the guide wire 22, and two ends of the filter screen 23 are fixed on the guide wire 22 through a developing sleeve 24. Referring to fig. 2, the conveying device 11 includes a conveying section 12, a recycling section 13, and an intermediate section 14 disposed between the conveying section 12 and the recycling section 13, wherein the central section 14 is a solid structure, i.e., the conveying section 12 is not communicated with the recycling section 13. The tube wall of the conveying section 12 is provided with a guide wire exchange port 15 for entering the way and a conveying hole 16, the guide wire exchange port 15 for entering the way is used for penetrating a guide wire 17, and the conveying hole 16 is used for penetrating a guide wire 22 of an embolism protector 21 during conveying. The recovery section 13 is provided with a recovery hole 18, and the recovery hole 18 is used for a guide wire 22 penetrating into the embolic protector 21 during recovery. In use, referring to fig. 3 and 4 together, the embolic protector 21 is preloaded in the delivery segment 12 of the delivery device 11, the guide wire 22 of the embolic protector 21 is passed out of the delivery hole 16, the delivery device 11 is delivered to the distal end of the lesion site through the access guide wire 17, the access guide wire 17 is withdrawn, then the embolic protector 21 is released, and the embolic protector 21 is released from the end of the delivery segment 12 away from the retrieval segment 13 to the target site, and the delivery device 11 is withdrawn. After the operation is completed, the delivery device 11 is switched to the retrieval section 13, the retrieval section 13 is passed through the retrieval hole 18 along the proximal end of the guide wire 22 of the embolic protector 21, the retrieval section 13 is delivered to a predetermined position along the guide wire 22, and the guide wire 22 is pulled proximally to pull the embolic protector 21 of the embolus into the retrieval section 13 for retrieval. The above-mentioned conveying device 11 needs to withdraw the catheter and change the port in the transportation and recovery, and the operation is complicated, and in the recovery process, when the filter screen 23 enters the recovery section 13, it is easy to squeeze and cut the embolus in the filter screen 23, causing the embolus to drop from the filter screen 23, causing the distal blood vessel to block, increasing the operation risk.

Disclosure of Invention

It is an object of the present invention to solve at least one of the problems of the prior art. The purpose is realized by the following technical scheme:

an embodiment of the present application provides a conveying device, which includes:

a delivery outer tube, and

the inner conveying pipe is inserted into the outer conveying pipe and fixed on the inner wall of the outer conveying pipe, the far end face of the inner conveying pipe extends out of the outer conveying pipe, the inner conveying pipe comprises a first pipe body and a first connecting piece arranged at the near end of the first pipe body, the first pipe body is fixedly connected with the inner wall of the outer conveying pipe, and the first connecting piece is used for being connected with a suction device in the recovery process.

According to the delivery device of the embodiment of the application, in the using process, two ends are not required to be switched, the operation of the instrument is simplified, in the recovery process, the near end of the first delivery inner tube is connected with the suction device, the suction device can capture embolus escaping from the embolism protector, and therefore embolus of a far-end blood vessel caused by the fact that the embolus escaping from the embolism protector flows to the far-end blood vessel is prevented, and the operation safety is improved.

In addition, in the conveying process, the access guide wire is arranged in the first conveying inner pipe, the guide wire of the embolism protector is arranged in the second conveying inner pipe, and the access guide wire and the guide wire of the embolism protector cannot be wound together, so that the operation is facilitated.

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

in one embodiment, the part of the first conveying inner pipe extending out of the conveying outer pipe is provided with an inclined hole, and the inclined hole is arranged on one side close to the center of the conveying outer pipe.

In one embodiment, the aperture of the inclined hole is not more than 0.5mm, and the included angle between the central line of the inclined hole and the extending direction of the first conveying inner pipe is 30-60 degrees.

In one embodiment, the distal end of the first inner delivery tube is a closed structure.

In one embodiment, the length of the first conveying inner pipe extending out of the conveying outer pipe is 2 mm-10 mm.

In one embodiment, the conveying device further comprises a second conveying inner pipe, the second conveying inner pipe is arranged side by side with the first conveying inner pipe, and the second conveying inner pipe is inserted into the conveying outer pipe and fixed on the inner wall of the conveying outer pipe.

In one embodiment, the distal end face of the second inner delivery tube is located within the outer delivery tube.

In one embodiment, the axial distance between the distal end face of the second conveying inner tube and the distal end face of the conveying outer tube is 10 mm-20 mm.

In one embodiment, the number of the first conveying inner pipes is multiple, and the multiple first conveying inner pipes are all fixed on the inner wall of the conveying outer pipe.

In one embodiment, the first conveying inner pipe comprises a first outer layer and a first inner layer from outside to inside, and the first inner layer is coaxially arranged on the inner side of the first outer layer.

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 diagram of a prior art embolic protector;

FIG. 2 is a schematic diagram of a prior art conveyor;

FIG. 3 is a schematic structural view of the conveying device shown in FIG. 1 during a conveying process;

FIG. 4 is a schematic view of the conveyor apparatus shown in FIG. 1 during a recycling process;

FIG. 5 is a schematic structural diagram of a conveying apparatus according to a first embodiment of the present application;

FIG. 6 is a schematic view of the conveyor apparatus shown in FIG. 5 from another perspective;

FIG. 7 is a schematic structural view of a delivery outer tube of the delivery device shown in FIG. 5;

FIG. 8 is a schematic structural view of an intermediate layer of the delivery tube shown in FIG. 7;

FIG. 9 is a schematic structural view of a first conveying inner tube of the conveying device shown in FIG. 5;

FIG. 10 is a schematic structural view of a second inner conveying tube of the conveying device shown in FIG. 5;

FIG. 11 is a schematic view of the conveyor apparatus shown in FIG. 5 during conveyance;

FIG. 12 is a schematic view of the conveyor apparatus of FIG. 5 during a recycling process;

FIG. 13 is a schematic structural view of a conveying device according to another embodiment of the present application during a conveying process;

FIG. 14 is a schematic structural view of a delivery device according to a second embodiment of the present application;

fig. 15 is a schematic structural view of the conveying device shown in fig. 14 from another perspective.

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.

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. "axial" generally refers to the length of the conveyor as it is transported and "radial" generally refers to the direction of the conveyor perpendicular to its "axial" direction, and defines both "axial" and "radial" directions for any component of the conveyor in accordance with this principle.

The present application provides a delivery device that can be used to both deliver and retrieve embolic protectors. The embolic protector of the present application is prior art, and the structure can refer to the structure of fig. 1, and is not described herein again. Of course, the embolic protector is not limited to the configuration shown in FIG. 1, and any suitable embolic protector is included within this scope.

Referring to fig. 5 and 6, the conveying device 100 according to the first embodiment of the present disclosure includes an outer conveying pipe 110, a first inner conveying pipe 120 and a second inner conveying pipe 130, wherein the first inner conveying pipe 120 and the second inner conveying pipe 130 are arranged side by side, are inserted into the outer conveying pipe 110, and are fixed to an inner wall of the outer conveying pipe 110. Referring also to FIG. 10, the outer delivery tube 110 is used to support the embolic protector 21, providing greater support and better delivery. The first delivery tube 120 has an inner diameter smaller than that of the second delivery tube 130, the first delivery tube 120 being used to pull the access wire 17, and the second delivery tube 130 being used to deliver and retrieve the embolic protector 21.

It should be noted that the second delivery inner tube 130 may be omitted, and the lumen of the outer delivery tube 110 may be used to remove space from the first delivery inner tube 120 for delivery and retrieval of the embolic protector 21.

Referring to fig. 6, the cross sections of the outer conveying pipe 110, the first inner conveying pipe 120 and the second inner conveying pipe 130 are all circular, and the sum of the outer diameter of the first inner conveying pipe 120 and the outer diameter of the second inner conveying pipe 130 and the inner diameter of the outer conveying pipe 110. In other embodiments, the cross sections of the first conveying inner tube 120 and the second conveying inner tube 130 may be elliptical, and the inner wall of the conveying outer tube 110 may form a part of the first conveying inner tube 120, that is, a part of the conveying outer tube 110 and the first conveying inner tube 120 together form an elliptical cross section, and similarly, the inner wall of the conveying outer tube 110 may form a part of the second conveying inner tube 130, that is, a part of the conveying outer tube 110 and the second conveying inner tube 130 together form an elliptical cross section.

In an embodiment, the first conveying inner tube 120 and the second conveying inner tube 130 are attached side by side, and the conveying outer tube 110 is wrapped on the outer sides of the first conveying inner tube 120 and the second conveying inner tube 130 and fixed by a hot melting or bonding process.

The outer diameter of the delivery tube 110 is 4F-7F (French). Referring to fig. 7, the outer delivery tube 110 includes an outer layer 111, an intermediate layer 112 and an inner layer 113 in sequence from outside to inside. The outer layer 111 is made of polymer material such as Pebax (polyether block polyamide), PA (polyamide), PC (polycarbonate), and the like. In one embodiment, the surface of the outer layer 111 distal from the intermediate layer 112 is further provided with a hydrophilic coating to reduce the pushing friction of the delivery device 100. The middle layer 112 is a rigid layer, primarily a woven mesh structure. The intermediate layer 112 is made of metal materials such as stainless steel 304V, stainless steel 316L, and nitinol to ensure the support performance of the delivery outer tube 110. Referring also to FIG. 8, intermediate layer 112 is woven from 10, 16, 18, or 32 braided filaments having a filament diameter of 0.0005inch (0.0127mm) to 0.004inch (0.1016mm) to form a braided mesh structure. In one embodiment, the mesh fabric of the intermediate layer 112 near the distal end has a lower mesh fabric density than the mesh fabric near the proximal end, so that the delivery tube 110 has a better flexibility at the distal end and a better pushability at the proximal end. The inner layer 113 is made of polymer material such as PTFE (polytetrafluoroethylene), FEP (perfluoroethylene propylene copolymer), ePTFE (expanded polytetrafluoroethylene), etc., and can reduce the friction between the embolic protector 21 and the wall of the delivery outer tube 110.

With continued reference to fig. 7, the distal end of the outer delivery tube 110 is further provided with a visualization ring 115, the visualization ring 115 is disposed on the distal end face of the outer delivery tube 110, the visualization ring 115 is used to indicate the relative positions of the embolic protector 21 and the distal end face of the outer delivery tube 110 in the delivery process and the recovery process, when the proximal visualization steel sleeve 24 of the screen 23 of the embolic protector 21 exceeds the visualization ring 115 in the delivery process, it indicates that the embolic protector 21 has left the outer delivery tube 110 and entered the blood vessel, and when the distal visualization steel sleeve 24 of the screen 23 of the embolic protector 21 is closer to the proximal end than the visualization ring 115 in the recovery process, it indicates that the embolic protector 21 has been recovered into the outer delivery tube 110. In one embodiment, the developer ring 115 is made of a developable metal material, such as platinum, tungsten, gold, silver, tantalum, nitinol, cobalt-chromium alloy, platinum-tungsten alloy, platinum-iridium alloy, and the like.

The inner diameter of the first inner delivery tube 120 is 0.014inch (0.3556mm) to 0.018inch (0.4572mm), and the first inner delivery tube 120 is used for delivering the access wire 17. Referring to fig. 9, the first inner delivery tube 120 includes a first tube 121 and a first connector 122 disposed at a proximal end of the first tube 121, the first connector 122 is used for connecting the suction device 31 during recovery, during the recovery, the suction device 31 can capture the embolus escaping from the embolic protector 21, thereby preventing the embolus escaping from the embolic protector 21 from flowing to the distal blood vessel to cause embolism of the distal blood vessel, and improving the safety of the operation. In one embodiment, the first connector 122 is a luer connector.

With continued reference to fig. 4, the distal end surface of the first inner delivery tube 120 extends beyond the outer delivery tube 110. In one embodiment, the length of the first inner delivery tube 120 extending out of the outer delivery tube 110 is 2mm to 10mm, which is beneficial for the suction device 31 to capture the embolus escaping from the embolic protector 21 during the recovery process, and prevent the embolus escaping from the embolic protector 21 from flowing to the distal blood vessel, thereby reducing the risk of the embolus blocking the blood vessel. In an embodiment, the portion of the first inner conveying pipe 120 extending out of the outer conveying pipe 110 is provided with an inclined hole 123, and the inclined hole 123 is provided at a side of the first inner conveying pipe 120 close to the second inner conveying pipe 130 to facilitate the capture of the escaped emboli by the suction device 31. In one embodiment, the diameter of the inclined hole 123 is not larger than 0.5mm, so as to prevent the suction device 31 from sucking excessive blood. In one embodiment, referring to fig. 13, the distal end of the first inner delivery tube 120 is closed, and the access guide wire 17 enters the first inner delivery tube 120 through the inclined hole 123, so that the suction device 31 can draw less blood and capture more thrombus. In one embodiment, the angle between the central line of the inclined hole 123 and the extending direction of the first conveying inner tube 120 is 30-60 degrees, which facilitates the capture of the escaped emboli by the suction device 31. In one embodiment, the number of the inclined holes 123 is 1 to 3, and the inclined holes 123 are disposed near the distal end surface of the outer conveying pipe 110.

In one embodiment, the first tube 121 includes, from outside to inside, a first outer layer 124 and a first inner layer 125, and the first inner layer 125 is coaxially disposed inside the first outer layer 124. The first outer layer 124 is made of polymer material such as Pebax (polyether block polyamide), PA (polyamide), PC (polycarbonate), etc., and the first inner layer 125 is made of polymer material such as PTFE (polytetrafluoroethylene), FEP (perfluoroethylene propylene copolymer), ePTFE (expanded polytetrafluoroethylene), etc. In one embodiment, the distal end of the first delivery tube 120 is further provided with a first visualization marker 126, the first visualization marker 126 being used to indicate the location of the distal-most end of the delivery device 100 within the vessel. In one embodiment, the first development mark 126 is made of a metal material capable of being developed, and the material of the metal material can be platinum, tungsten, gold, silver, tantalum, nickel-titanium alloy, cobalt-chromium alloy, platinum-tungsten alloy, platinum-iridium alloy, etc.

With continued reference to fig. 4, the distal end face of the second inner conveying pipe 130 is located inside the outer conveying pipe 110, that is, only the first inner conveying pipe 120 is located inside the distal end position of the outer conveying pipe 110, and the position of the outer conveying pipe 110 where the second inner conveying pipe 130 is not located is used for accommodating the filter mesh 23 of the embolic protector 21 during the recovery process, that is, during the recovery process, the filter mesh of the embolic protector 21 is pulled into the distal end of the outer conveying pipe 110 without entering the second inner conveying pipe 130, that is, during the recovery process, the filter mesh 23 of the embolic protector 21 can be kept inside the outer conveying pipe 110 without further entering the second inner conveying pipe 130, because the inner space of the distal end of the outer conveying pipe 110 is larger than the inner space of the second inner conveying pipe 130, the embolus in the filter mesh 23 of the embolic protector 21 can be crushed during the recovery process and fall off the filter mesh 24 due to the small inner space, thereby reduce distal end vascular occlusion's risk, simultaneously because the back recovery in-process seal wire 22 removes in second conveying inner tube 130, the internal diameter of second conveying inner tube 130 can be close with the silk footpath of seal wire 22 to can avoid conveying device 100 can deviate to one side and lead to the support to shift in the back recovery in-process, be favorable to improving the operation success rate.

In an embodiment, the axial distance between the distal end face of the second conveying inner pipe 130 and the distal end face of the conveying outer pipe 110 is 10mm to 20mm, so that the filter mesh 23 of the plug protector 21 can be completely accommodated in the conveying outer pipe 110 to prevent the second conveying inner pipe 130 from pressing the filter mesh 23.

In one embodiment, the second delivery inner tube 130 has an inner diameter of 0.02inch (0.508mm) to 0.04inch (1.016 mm). Referring to fig. 10, the second conveying inner tube 130 includes a second outer layer 131 and a second inner layer 132 from the outside to the inside, and the second inner layer 132 is coaxially disposed inside the second outer layer 131. The material of the second outer layer 131 is polymer material such as Pebax (polyether block polyamide), PA (polyamide), PC (polycarbonate), etc., and the material of the second outer layer 132 is polymer material such as PTFE (polytetrafluoroethylene), FEP (perfluoroethylene propylene copolymer), ePTFE (expanded polytetrafluoroethylene), etc.

In one embodiment, the second delivery inner tube 130 further comprises a second connector 133 disposed at the proximal end, and the second connector 133 is a luer connector, which can facilitate the connection of the second delivery inner tube 130 to a syringe or other device.

Referring to fig. 11 and 12, in use, the embolic protector 21 is first received in the delivery device 100, the guide wire 22 is threaded out of the second delivery inner tube 120, the first delivery inner tube 110 is then threaded over the access guide wire 17, the distal end of the delivery device 100 is advanced to the target location under the guidance of the access guide wire 17, and the embolic protector 21 received in the delivery device 100 is then released to the target location. When the operation is completed, the embolic protector 21, which is loaded with emboli, needs to be recovered and withdrawn from the body. During retrieval, the guide wire 22 of the embolic protector 21 is passed through the second delivery inner tube 130, the second delivery inner tube 130 is brought to a proper position along the guide wire 22, the suction device 31 is connected to the first connector 122 of the first delivery inner tube 110, the guide wire 22 of the embolic protector 21 is pulled to pull the mesh 23 of the embolic protector 21 into the delivery outer tube 110, the suction device 31 is simultaneously activated, the suction device 31 can catch emboli that have escaped from the mesh 23 during retrieval, and finally the delivery device 100 is withdrawn out of the body together with the embolic protector 21.

Above-mentioned conveyor 100, in the use, do not need both ends to switch, the operation of apparatus has been simplified, and in the recovery process, guide wire 22 can move in second conveying inner tube 130, the internal diameter of second conveying inner tube 130 can be close with the silk footpath of guide wire 22, thereby can avoid conveying conveyor 100 can deviate to one side and lead to the support aversion in the recovery process, the filter screen 24 that has the embolus can be retrieved in conveying outer tube 110 simultaneously, because the space of conveying outer tube 110 is great, can avoid crushing the embolus in the filter screen 23 of embolism protector 21. In addition, in the recovery process, the first conveying inner tube 120 is communicated with the suction device 31, and escaped emboli are captured by the suction device 31, so that the emboli are prevented from entering a distal blood vessel to cause the blockage of the distal blood vessel, and the success rate of the operation is improved.

In addition, because the access guide wire 17 is arranged in the first conveying inner tube 120 and the guide wire 22 of the embolism protector 21 is arranged in the second conveying inner tube 130 in the conveying process, the access guide wire 17 and the guide wire of the embolism protector 21 cannot be wound together, and the operation is convenient.

Referring to fig. 14 and 15, a conveying device 200 according to a second embodiment of the present application is substantially the same as the conveying device 100 according to the first embodiment, and mainly differs therefrom in that: the first conveying inner pipe 220 is a plurality of first conveying inner pipes 220, and the plurality of first conveying inner pipes 220 are arranged around the second conveying inner pipe 230. In one embodiment, the number of the first conveying inner tubes 220 is 2 to 8.

Referring to fig. 15, the plurality of first conveying inner tubes 220 are uniformly distributed on the outer circumference of the second conveying inner tube 230, and the conveying outer tube 210 is wrapped on the outer circumference of the plurality of first conveying inner tubes 220 and fixed by a hot melting or bonding process.

In an embodiment, the portion of each first conveying inner tube 220 extending out of the conveying outer tube 210 is provided with an inclined hole 223, the inclined hole 223 is disposed at a side facing the second conveying inner tube 230, and each first conveying inner tube 220 is connected to a suction device during the recycling process. In one embodiment, the length of the first inner delivery tube 220 extending out of the outer delivery tube 210 is not exactly equal. In one embodiment, the inclined holes 223 of the first inner conveying pipes 220 are staggered, that is, the axial distances between the inclined holes 223 and the distal end surface of the outer conveying pipe 210 are not equal, which is beneficial for the suction device to capture emboli scattered at various positions.

In one embodiment, the distal end of each of the first inner delivery tubes 220 is closed, and the first inner delivery tubes 220 are in blood flow communication with the outer delivery tube 220 through the slanted holes 223.

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.