Conveying device

Abstract

The invention provides a conveying device. The conveying device comprises a main stent conveying pipe and a multi-cavity pipe. The main stent conveying pipe is used for conveying an intravascular stent, and a branch opening is formed in the intravascular stent; the multi-cavity tube comprises a plurality of cavities, the cavities have different axial lengths, the preset guide wire is preset in at least one branch opening, and the multi-cavity tube can reach the branch opening along the preset guide wire to establish a passage from the branch opening to the branch blood vessel. According to the conveying device, the intravascular stent can be conveyed only through the lower limb admission passage, the intravascular stent does not need to be conveyed from the upper limb admission passage, and damage to healthy blood vessels is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a conveying device. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Aortic disease, mainly including aortic aneurysm and aortic dissection, is a common serious life-threatening disease. If not treated in time, once an aneurysm or dissecting aneurysm ruptures, the mortality rate is extremely high.

[0004] Thoracic aortic dissection or thoracic aortic aneurysm is the most common aortic disease, with high mortality, surgery-related mortality, and surgical complication rates. Surgery and thoracic aortic endovascular repair are common treatments for thoracic aortic disease; among them, thoracic aortic endovascular repair is a minimally invasive surgical method that uses interventional therapy-related technologies to treat thoracic aortic disease. This surgical method uses a pusher to push the branch stent to the location of the vascular lesion. The branch stent supports the inner wall of the vascular lesion to block the lesion. This surgical method has become the main surgical method for treating thoracic aortic disease.

[0005] There are three important branch arteries above the aortic arch that supply blood to the brain and both upper limbs. The three blood vessels are the brachiocephalic artery (innominate artery), the left common carotid artery, and the left subclavian artery. When aortic dissection or aortic aneurysm involves the ascending aorta or aortic arch, in order to protect the three important branch arteries on the aortic arch, a branched vascular stent technology is required. The vascular stent consists of two parts: the main stent and the sub-stent. It can block the breakthrough of the aortic lesions while retaining the opening of the branch artery on the aortic arch. Although minimally invasive surgery has the advantage of less trauma compared to surgical surgery, there are also some problems, especially the treatment of branch blood vessels. After the main stent is implanted through the lower limb approach, it is usually necessary to puncture the branch blood vessels of the upper limb to introduce the guide catheter and guidewire, establish a delivery path, and then release the sub-stent. For the healthy blood vessels of the upper limbs, there is a great risk of damage.

[0006] Therefore, a new delivery system is needed to achieve the precise release of branch stents while reducing damage to healthy blood vessels caused by puncture and other operations. Summary of the invention

[0007] Based on this, it is necessary to provide a delivery device that can accurately release the branch stent while reducing damage to healthy blood vessels caused by puncture and other operations.

[0008] The present invention provides a conveying device, comprising:

[0009] The main stent delivery tube is used to deliver the vascular stent. The vascular stent includes a main stent and a sub-stent. The main stent includes a plurality of branch openings. The sub-stent can be connected to the main stent through the branch openings.

[0010] The multi-lumen tube comprises a preset guide wire and a plurality of cavities, wherein the plurality of cavities have different axial lengths, and the preset guide wire is preset in at least one branch opening; the preset guide wire is passed through the cavity with the shortest axial length of the multi-lumen tube, and the multi-lumen tube can reach the branch opening along the preset guide wire, thereby assisting in establishing a passage from the branch opening to the branch blood vessel.

[0011] In one embodiment, a groove section is provided on the main support, and the branch opening is provided in the groove section of the main support.

[0012] In one embodiment, the diameter of the end of the branch opening gradually increases along the longitudinal center axis of the branch opening in a direction away from the branch opening.

[0013] In one embodiment, the multi-lumen tube comprises three cavities, and the other two cavities of the multi-lumen tube except the cavity for inserting the pre-installed guide wire can be used for inserting the hard guide wire and the loach guide wire respectively.

[0014] In one embodiment, the multi-lumen tube comprises a main body section and a distal section, and the distal section of the multi-lumen tube comprises a converging guide head.

[0015] In one embodiment, the distal section of the multi-lumen tubing includes a tapered tip.

[0016] In one embodiment, the distal section of the multi-lumen tubing is biased to one side.

[0017] In one embodiment, the outlet of the cavity with the shortest axial length of the multi-lumen tube is arranged at the main body section of the multi-lumen tube.

[0018] In one embodiment, a preset guidewire is preset in all branch openings.

[0019] In one embodiment, it further includes:

[0020] A sub-stent delivery tube, used for delivering the sub-stent;

[0021] The sheath core has a Tip head at the distal end, and the Tip head can reach the branch blood vessels.

[0022] In one embodiment, the main stent and the sub-stent are released in stages by means of coating winding.

[0023] The beneficial effects of the present application are as follows: different from the prior art, the delivery device of the present application can be completely delivered through a unilateral approach to the lower limbs. By setting a pre-set guide wire, the multi-lumen tube can reach the branch opening of the branch stent along the pre-set guide wire, and then enter the branch blood vessel, establishing a pathway for subsequent delivery of the branch stent, thereby reducing damage to healthy blood vessels caused by puncture, sheath passage and other operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 Schematic diagram of the overall conveying device

[0026] Figure 2 This is a schematic diagram of the positional relationship between the aortic arch and the vascular stent;

[0027] Figure 3 A schematic diagram of the positional relationship of the pre-placed guide wire inserted into the branch opening of the main stent;

[0028] Figure 4 Another structural schematic diagram of a branch opening of a main stent;

[0029] Figure 5 is a stereoscopic view of a multi-lumen tube with three cavities;

[0030] Figure 6 is a cross-sectional view of a multi-lumen tube with three lumens;

[0031] Figure 7 It is a schematic diagram of the position relationship of the multi-lumen tube along the first preset guide wire to the first branch port;

[0032] Figure 8 It is a schematic diagram of the position relationship of the multi-lumen tube along the loach guide wire to the brachiocephalic artery;

[0033] Fig. 9 This is a schematic diagram of the position of the rigid guidewire remaining in the brachiocephalic artery after the multi-lumen catheter is withdrawn;

[0034] Fig.10 This is a schematic diagram of the positional relationship of the stent delivered to the brachiocephalic artery;

[0035] Fig.11 It is a schematic diagram of the position relationship of the multi-lumen tube along the second pre-placed guide wire to the second branch opening;

[0036] Fig.12This is a schematic diagram of the positional relationship of the rigid guidewire left in the left common carotid artery and the left subclavian artery after the multi-lumen tube is withdrawn;

[0037] Fig.13 A three-dimensional diagram of a multi-lumen tube having multiple cavities with different axial lengths according to a first embodiment of the present invention;

[0038] Fig.14 A three-dimensional diagram of another structure of a multi-lumen tube having a plurality of cavities with different axial lengths according to the first embodiment of the present invention;

[0039] Fig.15 is a schematic diagram of a main stent with an envelope;

[0040] Fig.16 Schematic diagram of a sub-stent with an envelope;

[0041] Fig.17 is a schematic diagram of the envelope line;

[0042] Fig.18 A schematic diagram showing that after the main stent is released from the main stent delivery tube, the groove end of the main stent is unfolded, and the main body of the main stent is restrained by the capsule line and not unfolded;

[0043] Fig.19 Schematic diagram of the sub-stent being released from the sub-stent delivery tube, the sub-stent umbrella edge being unfolded, and the main section of the sub-stent being restrained by the envelope line and not unfolded

[0044] Fig. 20 This is a schematic diagram of the positional relationship of the third pre-placed guide wire being placed in the left and right renal arteries through the main stent;

[0045] Fig.21 This is a schematic diagram of the position relationship when the loach guidewire is used to superselect the left renal artery;

[0046] Fig. 22 This is a schematic diagram of the positional relationship of the vascular stent in the left and right renal arteries;

[0047] Fig.23 A stereoscopic view of a multi-lumen tube with a convergent guide head at the distal end of the multi-lumen tube according to a second embodiment of the present invention;

[0048] Fig.24 A stereoscopic view of a multi-lumen tube in which the distal end section of the multi-lumen tube is a conical head according to a second embodiment of the present invention;

[0049] Fig.25 A stereoscopic view of a multi-lumen tube in which the distal end section of the multi-lumen tube is offset to one end according to a second embodiment of the present invention;

[0050] Fig.26 A cross-sectional view of a multi-lumen tube in which the distal end section of the multi-lumen tube is offset to one end according to a second embodiment of the present invention;

[0051] Fig. 27This is a schematic diagram of the third branch opening being too far forward relative to the left subclavian artery after the main stent is released in the second embodiment of the present invention;

[0052] Fig.28 for Fig. 27 A partial enlarged view of

[0053] Fig.29 This is a schematic diagram of the third branch opening being too far back relative to the left subclavian artery after the main stent is released in the second embodiment of the present invention;

[0054] Fig.30 for Fig.29 A partial enlarged view of

[0055] Fig.31 A three-dimensional diagram of a multi-lumen tube in which a short lumen outlet is arranged in a main section and the multi-lumen tube only includes two cavities;

[0056] Fig.32 A cross-sectional view showing that a short lumen outlet is arranged in a main section of a multi-lumen tube and the multi-lumen tube only includes two cavities;

[0057] Fig.33 This is a schematic diagram of the positional relationship of a pre-placed guide wire pre-placed in all branch openings according to the third embodiment of the present invention;

[0058] 100. Conveying device;

[0059] 11. Main stent delivery tube; 12. Multi-lumen tube; 120. Offset side; 121. Multi-lumen tube main section; 1211. Side outlet; 122. Multi-lumen tube distal section; 123. First cavity; 124. Second cavity; 125. Third cavity; 120. Offset side; 13. Preset guide wire; 131. First preset guide wire; 132. Second preset guide wire; 133. Third preset guide wire; 134. Fourth preset guide wire; 14. Loach guide wire; 15. Hard guide wire; 16. Sub-stent delivery tube; 17. Sheath core; 18. Tip head; 19. Handle;

[0060] 200. Vascular stent;

[0061] 21. Main stent; 211. Branch opening; 2111. External development mark of branch opening; 2112. Internal development mark of branch opening; 212. Main stent capsule; 213. Narrow membrane of main stent; 214. Groove section of main stent; 215. Main stent body section; 22. Sub-stent; 221. Sub-stent body section; 222. Sub-stent umbrella edge; 223. Sub-stent capsule; 224. Sub-stent development mark; 23. Capsule line; 201. First branch opening; 202. Second branch opening; 203. Third branch opening; 204. Fourth branch opening; 205. Fifth branch opening; DETAILED DESCRIPTION

[0062] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0063] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0065] In the field of interventional medical devices, the "distal end" is defined as the end away from the operator during surgery, and the "proximal end" is defined as the end close to the operator during surgery. "Axial" refers to the direction parallel to the line connecting the distal and proximal centers of the medical device, "radial" refers to the direction perpendicular to the above axial direction, and "circumferential" refers to the direction around the line connecting the distal and proximal centers of the medical device.

[0066] First embodiment

[0067] The following description will be made using the aortic arch as an example. It should be noted that the delivery device 100 is also applicable to replacing other blood vessels with branches.

[0068] like Figure 1-3As shown, in this embodiment, the delivery device 100 includes a main stent delivery tube 11, a multi-lumen tube 12, a sheath core 17, a tip head 18 and a handle 19. Among them, the main stent delivery tube 11 is used to deliver a vascular stent 200 to a target blood vessel. The vascular stent 200 includes a main stent 21 and a branch stent 22. The main stent 21 is provided with a plurality of branch openings 211 for the branch stents 22 to penetrate. The branch stents 22 can be connected with the main stent 21 through the branch openings 211. In this embodiment, in order to facilitate the release of the main stent 21, there is enough space for superselection when using the multi-lumen tube 12 to establish a branch passage (in interventional medicine, "superselection" means that during interventional operations, a catheter or guide wire is selectively inserted into a specific blood vessel or organ branch through a special catheter technology to achieve accurate positioning and treatment of the lesion site) The main stent 21 includes a main stent groove section 214 and a main stent body section 215, and the branch opening 211 is provided in the main stent groove section 214.

[0069] In this embodiment, the branch openings 211 are defined from left to right as the first branch opening 201, the second branch opening 202 and the third branch opening 203, which correspond to the three branch vessels above the aortic arch: the brachiocephalic artery, the left common carotid artery and the left subclavian artery. The distal end of the first pre-placed guide wire 131 passes through the first branch opening 201, and the distal end of the first pre-placed guide wire 131 is detachably disposed at the distal end of the main stent 21. Specifically, the distal end of the main stent 21 is provided with a main stent envelope 212 and a main stent narrow membrane 213 (see Fig.15 ), the distal end of the first preset guidewire 131 is arranged in the interlayer of the main stent capsule 212 and the main stent narrow membrane 213, and the first preset guidewire 131 can be directly withdrawn from the interlayer later. The second preset guidewire 132 passes through the third branch opening 203 and the second branch opening 202, and the proximal and distal ends of the second preset guidewire 132 are both outside the main stent 21. Similarly, a third preset guidewire 133 can also be arranged, and the second preset guidewire 132 and the third preset guidewire 133 pass through the second branch opening 202 and the third branch opening 203 respectively, and the distal ends are arranged on the main stent 21. Only the first preset guidewire 131 and the second preset guidewire 132 can reduce the use of the preset guidewire 13 and improve the convenience of subsequent delivery and establishment of a pathway.

[0070] like Figure 4 As shown, in other embodiments, in order to facilitate the multi-lumen tube 12 to have sufficient adjustment angle when superselecting branch blood vessels and reduce the restriction of the edge of the branch opening 211 on the multi-lumen tube 12, the end diameter of the branch opening 211 gradually increases along the longitudinal center axis of the branch opening 211 away from the branch opening 211.

[0071] In addition, the tip of the preset guide wire 13 can be softened and polished to prevent the sharp tip from puncturing the blood vessel during operation.

[0072] When the main stent 21 is delivered to the aortic arch through the main stent delivery tube 11 and released, since the main stent 21 is provided with a pre-set guide wire 13, the multi-lumen tube 12 can reach the branch opening 211 along the pre-set guide wire 13, that is, the pre-set guide wire 13 establishes a passage from the body to the branch opening 211. Specifically, during the delivery of the main stent 21 to the aortic arch, the branch opening 211 should be roughly aligned with the three branch blood vessels on the aortic arch.

[0073] like Figure 5-6 As shown, the multi-lumen tube 12 includes three cavities, namely a first cavity 123, a second cavity 124 and a third cavity 125, which can be respectively penetrated by a preset guide wire 13, a loach guide wire 14 and a hard guide wire 15 (see Figure 7-9 ). The loach guidewire 14, also known as a hydrophilic guidewire or super-slippery guidewire, is a medical device with a hydrophilic coating on the surface of the guidewire. This coating forms a smooth gel when it encounters a liquid, which increases lubricity and reduces friction, making the guidewire very lubricated and able to pass through a narrow part smoothly, as flexible as a loach, hence the name. In this embodiment, the use of the loach guidewire 14 can improve the convenience of super-selecting branch blood vessels.

[0074] like Figure 7-10 As shown, the first cavity 123 of the multi-lumen tube 12 reaches the first branch opening 201 along the first preset guide wire 131, and after the distal end of the multi-lumen tube 12 passes through the first branch opening 201, a loach guide wire 14 is passed through the second cavity 124, and the loach guide wire 14 passes through the distal end of the multi-lumen tube 12 to superselect the branch blood vessels. After observing that the loach guide wire 14 has superselected the brachiocephalic artery through X-ray and other technologies, the first preset guide wire 131 is recovered, and the multi-lumen tube 12 is pushed to move toward the distal end along the loach guide wire 14 until the multi-lumen tube 12 re-accommodates the loach guide wire 14 into the second cavity 124, and then a hard guide wire 15 is passed through the third cavity 125. After observing that the distal end of the hard guide wire 15 reaches the distal end of the multi-lumen tube 12 through imaging techniques such as DSA or ultrasound, the loach guide wire 14 and the multi-lumen tube 12 are withdrawn, and the hard guide wire 15 becomes a passage from the body to the brachiocephalic artery. Fig.19 ) through the tip head 18 at the distal end of the sheath core 17 (see Figure 1 ) The distal end of the sub-stent 22 is delivered to the brachiocephalic artery along the hard guide wire 15, and the proximal end of the sub-stent 22 is still in the first branch opening 201. The sub-stent delivery tube 16 is manipulated by the handle 19 to release the sub-stent 22 and withdraw it.

[0075] like Figure 11-12As shown, for the delivery of the sub-stent 22 to the left common carotid artery or the left subclavian artery, the process is similar, except that after the loach guidewire 14 superselects the left common carotid artery or the left subclavian artery, the second pre-set guidewire 132 is not recovered, and the hard guidewire 15 is passed through the third cavity 125 to the left common carotid artery or the left subclavian artery, the multi-lumen tube 12 is recovered, and the second pre-set guidewire 132 is retained before all the extracorporeal access to the branch vessels is established. When the sub-stent delivery tube 16 delivers the distal end of the sub-stent 22 to the left common carotid artery or the left subclavian artery along the hard guidewire 15 through the Tip head 18, the proximal end of the sub-stent 22 is still in the second branch opening 202 or the third branch opening 203, and the sub-stent delivery tube 16 releases the sub-stent 22 and withdraws.

[0076] In this embodiment, there is no sequence requirement for the above process of establishing an extracorporeal access to a branch blood vessel and delivering the branch stent 22 , and the operator can adjust the sequence according to actual conditions.

[0077] like Fig.13 As shown, in order to further improve the convenience of the multi-lumen tube 12 in super-selecting branch blood vessels, the multiple cavities of the multi-lumen tube 12 in other embodiments of the present invention may have different axial lengths. The distance between the axial distance of the shortest cavity and the axial distance of the longest cavity is limited to the situation that the long cavity extends out of the branch opening 211 while the short cavity is still in the branch opening 211, so that the multi-lumen tube 12 will not be unable to extend out of the branch opening 211 or reach a distant branch blood vessel due to the limitation of the unrecovered pre-set guide wire 13, and the shortest cavity is still in the branch opening 211 after the longer cavity extends out of the branch opening 211, which also ensures that the distal end of the multi-lumen tube 12 has a larger range of motion when moving. Specifically, the multi-lumen tube 12 can be arranged in the form of two shorter cavities of the same length and one longer cavity. As shown Fig.14As shown, the multi-lumen tube 12 can also adopt a long, medium and short gradient setting, which is not limited here. Since the second branch port 202 and the third branch port 203 in this embodiment share the second preset guide wire 132, the multi-lumen tube 12 cannot directly retract the second preset guide wire 132 after extending from the second branch port 202 or the third branch port 203. Affected by the traction of the second preset guide wire 132, the distal end of the multi-lumen tube 12 is difficult to reach a place too far from the branch opening 211. The design of the long and short cavities makes it difficult for the short cavity of the multi-lumen tube 12 to reach the vicinity of the branch opening 211 along the preset guide wire 13, and the long cavity of the multi-lumen tube 12 has reached the branch opening 211 or extended out of the branch opening 211. The multi-lumen tube 12 can adjust the extension distance of the long cavity of the multi-lumen tube 12 according to the morphology of the blood vessel, so as to facilitate the super-selection of the loach guide wire 14 into the branch blood vessel. The long and short cavity characteristics of the multi-lumen tube 12 are also applicable to establishing a path from the branch blood vessel of the first opening to the outside of the body. Furthermore, the preset guide wire 13 is passed through the cavity with the shortest axial length of the multi-lumen tube 12, so that when the multi-lumen tube 12 reaches the branch opening 211 along the preset guide wire 13, the cavity with the longest axial length of the multi-lumen tube 12 extends out of the branch opening 211 and is closer to the branch blood vessel, which is convenient for superselection.

[0078] At this point, all the sub-stents 22 are delivered to the target branch vessels through a unilateral approach to the lower limbs. There is no need to deliver a guide wire to the branch opening 211 through upper limb puncture to establish a pathway and then deliver the sub-stents 22, thereby reducing damage to healthy blood vessels caused by puncture, sheath insertion and other operations.

[0079] like Figure 15-17 As shown, in order to improve the accuracy of the release of the main stent 21, the main stent 21 can still be positioned after being released from the main stent delivery tube 11, and the branch opening 211 of the main stent 21 can better align the branch blood vessels after the main stent 21 is released, so as to facilitate the subsequent superselection of the branch blood vessels by the multi-lumen tube 12. In this embodiment, the vascular stent 200 can also be released by using a coating winding method.

[0080] The main stent 21 includes a main stent groove section 214, a main stent body section 215, a main stent envelope 212 and a main stent narrow membrane 213. The distal end of the first preset guide wire 131 is arranged in the interlayer between the main stent envelope 212 and the main stent narrow membrane 213. The branch opening 211 of the main stent 21 is provided with a branch opening outer side development mark 2111 and a branch opening inner side development mark 2112. The sub-stent 22 includes a sub-stent body section 221, a sub-stent umbrella edge 222, a sub-stent envelope 223 and a sub-stent development mark 224. The sub-stent development mark 224 is arranged at the connection between the sub-stent body section 221 and the sub-stent umbrella edge 222.

[0081] The main stent coating 212 and the sub-stent coating 223 use a coating line 23 to Fig.17The coating line 23 is wrapped in a manner such that it binds the main stent coating 212 / sub-stent coating 223, thereby binding the main stent body segment 215 / sub-stent body segment 221.

[0082] like Figure 17-19 As shown, specifically, when the main stent delivery tube 11 delivers the main stent 21 to the aortic arch blood vessel, the main stent delivery tube 11 is withdrawn to release the main stent 21. Since the main stent envelope 212 is bound by the envelope line 23, the main stent groove section 214 can be normally deployed, and the main stent body section 215 is bound by the envelope line 23 and cannot be deployed. Through X-ray and other technologies, observe whether the external development mark 2111 of the branch opening of the main stent 21 is aligned with the vascular opening of the aortic arch branch artery. If it is observed that the external development mark 2111 of the branch opening is not aligned with the branch vascular opening, the relative position of the branch opening 211 of the main stent 21 and the vascular opening of the aortic arch branch artery can be adjusted by moving the main stent 21. If it is observed that the external development mark 2111 of the branch opening is aligned with the branch vascular opening, pull the envelope line 23 to release the constraint of the main stent body section 215, so that the main stent 21 is fully deployed. Compared with the method of withdrawing the main stent delivery tube 11 without the envelope line 23 to release the main stent 21 as a whole, in this embodiment, since the main stent main body section 215 is restrained by the envelope line 23 and is not deployed after the main stent delivery tube 11 is withdrawn, the main stent 21 can be adjusted further when it is found that the position is not good. The accurate release of the main stent 21 is achieved, the relative distance between the branch opening 211 and the branch blood vessel is reduced, and the subsequent multi-lumen tube 12 is convenient for superselection of the branch blood vessel.

[0083] Similarly, when the sub-stent delivery tube 16 delivers the sub-stent 22 along the hard guide wire 15 to the branch opening 211, the sub-stent delivery tube 16 is withdrawn to release the sub-stent 22. Since the sub-stent envelope 223 is bound by the envelope line 23, the sub-stent umbrella edge 222 can be normally unfolded, and the sub-stent main body 221 is bound by the envelope line 23 and cannot be unfolded. Through X-ray and other technologies, it is observed whether the sub-stent development mark 224 is near the development mark 2112 inside the branch opening, so as to adjust the relative position of the sub-stent 22 and the branch opening 211, realize the accurate release of the sub-stent 22, and avoid internal leakage.

[0084] The present invention is also applicable to blood vessels with branches such as the left and right renal arteries, the abdominal aorta, the celiac trunk and the superior mesenteric artery. The left and right renal arteries are used as an example for explanation.

[0085] like Figure 20-22As shown, in order to adapt to the structure of the left and right renal arteries, the branch openings 211 of the main stent 21 of the vascular stent 200 for the left and right renal arteries are arranged opposite to each other, and the third preset guide wire 133 passes through the outside of the main stent 21 from the fourth branch opening 204 and then passes through the inside of the main stent 21 from the fifth branch opening 205. The head end and the tail end of the third preset guide wire 133 are both located outside the body during the delivery of the main stent 21. When the main stent 21 is released, the multi-lumen tube 12 follows the preset guide wire 13 to reach the fourth branch opening 204 or the fifth branch opening 205, and then the loach guide wire 14 is passed through to superselect the left renal artery / right renal artery, and finally the hard guide wire 15 is passed through to reach the left renal artery / right renal artery. Before all branch vascular accesses are established, the third preset guide wire 133 is retained, the loach guide wire 14 and the multi-lumen tube 12 are withdrawn, and the sub-stent delivery tube 16 delivers the distal end of the sub-stent 22 to the left renal artery or the right renal artery along the hard guide wire 15 through the Tip head 18, and the sub-stent umbrella edge 222 is still in the fourth branch opening 204 or the fifth branch opening 205, and the sub-stent delivery tube 16 releases the sub-stent 22 and withdraws.

[0086] Second embodiment

[0087] like Fig.23 As shown, different from the first embodiment, the multi-lumen tube 12 includes a multi-lumen tube main section 121 and a multi-lumen tube distal section 122. In order to further improve the convenience of the multi-lumen tube 12 in super-selecting branch blood vessels, the multi-lumen tube distal section 122 of this embodiment includes a convergent guide head. The convergent guide head can be set to a cone, a parabola, a semicircle, a bullet shape, etc. The multi-lumen tube distal section 122 is set to a convergent guide head. On the one hand, it can reduce the resistance of the multi-lumen tube 12 during the transportation process, and on the other hand, it is also conducive to passing through the branch opening 211, and the directionality is more obvious when using a guide head with a convergent distal end to super-select branch blood vessels.

[0088] like Fig.24 As shown, further, in this embodiment, the distal end of the multi-lumen tube 12 is set as a conical head. The conical head is smaller in size and has a more obvious advantage in passing through a narrow mouth, which is beneficial to further improve the convenience of the multi-lumen tube 12 in super-selecting branch blood vessels.

[0089] The blood vessels of the human body are different, and the same specification products are difficult to meet the needs of individuals. It is inevitable that there will be a large distance between the branch opening 211 of the main stent 21 and the branch blood vessels. Figure 25-26 As shown, in this example, the distal end of the multi-lumen tube 12 with a conical head can be further set to be biased to one side, and the side where the cavity with a longer axial distance of the multi-lumen tube 12 is located is defined as the biased side 120. When the multi-lumen tube 12 passes through the branch opening 211 and is still far away from the branch blood vessel, the multi-lumen tube 12 can be rotated to adjust the biased direction so that the biased side 120 is away from the inner wall of the blood vessel, thereby improving the convenience of the multi-lumen tube 12 to superselect the branch blood vessel.

[0090] like Figure 27-30 As shown, the third branch opening 203 is taken as an example for explanation. Fig. 27 and 28 ), the third branch opening 203 is too close to the left common carotid artery relative to the left subclavian artery, and the multi-lumen tube 12 will also be forward (i.e., close to the left common carotid artery) when extending from the third branch opening 203, resulting in the loach guide wire 14 being used for superselection to be oriented toward the inner wall side of the left subclavian artery vascular opening, making superselection difficult. The multi-lumen tube 12 of this embodiment is provided with an offset side 120. When the third branch opening 203 is too close to the left common carotid artery relative to the left subclavian artery, the offset side 120 of the multi-lumen tube 12 can be rotated to move away from the inner wall side of the left subclavian artery vascular opening (i.e., the multi-lumen tube 12 is rotated to move the offset side 120 toward the side of the left subclavian artery away from the left common carotid artery), thereby reducing the difficulty of superselection of the loach guide wire 14. Similarly, after the vascular stent 200 is released (see Figure 29-30 ), if the third branch opening 203 is too far back relative to the left subclavian artery, the difficulty of superselection of the loach guidewire 14 can be reduced by rotating the multi-lumen tube 12 so that the offset side 120 of the multi-lumen tube 12 is toward the inner wall side of the left subclavian artery close to the left common carotid artery.

[0091] like Figure 31-32 As shown, in other embodiments, the multi-lumen tube 12 only includes two cavities, a first cavity 123 and a second cavity 124, and the first cavity 123 is defined as a cavity with a shorter axial length, and the second cavity 124 is defined as a cavity with a longer axial length. Since the cavities of the multi-lumen tube 12 have different axial lengths and the pre-set guide wire 13 is inserted into the first cavity 123, when the multi-lumen tube 12 reaches the branch opening 211 along the pre-set guide wire 13, the second cavity 124 can directly extend into the branch blood vessel, and there is no need to use the loach guide wire 14 to super-select the branch blood vessel to establish a passage. When the multi-lumen tube 12 reaches the branch opening 211 along the pre-set guide wire 13, it is only necessary to insert the hard guide wire 15 into the second cavity 124, withdraw the multi-lumen tube 12, and the passage from the body to the branch blood vessel is established. Compared with the multi-lumen tube 12 including three cavities in the first embodiment, the multi-lumen tube 12 of this embodiment includes only two cavities, so that the overall diameter of the multi-lumen tube 12 can be reduced, thereby making it easier for the multi-lumen tube 12 to pass through / withdraw from the branch opening 211, thereby improving the smoothness of transportation. Furthermore, a side outlet 1211 of the first cavity 123 can be provided in the multi-lumen tube main body section 121, and the outlet of the second cavity 124 is provided at the distal end of the multi-lumen tube 12, thereby increasing the distance that the distal end of the multi-lumen tube 12 extends from the branch opening 211, thereby improving the convenience of the multi-lumen tube 12 in super-selecting branch blood vessels.

[0092] Third embodiment

[0093] like Fig.33As shown, unlike the first embodiment, a fourth preset guide wire 134 is preset in all branch openings 211. In this embodiment, the aortic arch vascular stent 200 is taken as an example for explanation, and the fourth preset guide wire 134 is preset in three branch openings 211. Specifically, after the fourth preset guide wire 134 passes through one of the branch openings 211, it passes through the other two branch openings 211 in the form of a bifurcated line. Compared with the first embodiment, the fourth preset guide wire 134 set in this way does not need to set the first preset guide wire 131, and does not need to set the distal end of the first preset guide wire 131 in the interlayer of the main stent envelope 212 and the main stent narrow membrane 213 as in the first embodiment. It avoids the situation that the first preset guide wire 131 may fall off from the interlayer during the process of conveying the main stent 21 and the multi-lumen tube 12 to pass the first preset guide wire 131, thereby improving the reliability of the conveying device 100. Since only one fourth preset guide wire 134 is provided, during the process of the multi-lumen tube 12 using the fourth preset guide wire 134 to establish a path for the branched blood vessels, the fourth preset guide wire 134 can be withdrawn only after the path establishment of all the branched blood vessels is completed. While reducing the number of preset guide wires 13 required for establishing the branched blood vessels, the number of times the preset guide wires 13 are withdrawn during the process of the multi-lumen tube 12 establishing the path for the branched blood vessels is reduced, thereby avoiding operational errors caused by too many preset guide wires 13 (e.g., withdrawing the second preset guide wire 132 when the first preset guide wire 131 needs to be withdrawn, causing an operational accident).

[0094] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A conveying device, characterized in that: include: A main stent delivery tube, used for delivering a blood vessel stent, wherein the blood vessel stent comprises a main stent and a sub-stent, wherein the main stent comprises a plurality of branch openings, and the sub-stents can be connected to the main stent through the branch openings; A multi-lumen tube comprises a pre-set guide wire and a plurality of cavities, wherein the plurality of cavities have different axial lengths, and the pre-set guide wire is pre-set in at least one of the branch openings; the pre-set guide wire is passed through the cavity with the shortest axial length of the multi-lumen tube, and the multi-lumen tube can reach the branch opening along the pre-set guide wire to assist in establishing a passage from the branch opening to the branch blood vessel.

2. The conveying device according to claim 1, characterized in that The main support is provided with a groove section, and the branch opening is provided in the groove section of the main support.

3. The conveying device according to claim 1, characterized in that The diameter of the end of the branch opening gradually increases in a direction away from the branch opening along the longitudinal center axis of the branch opening.

4. The conveying device according to claim 1, characterized in that The multi-lumen tube comprises three cavities, and the other two cavities of the multi-lumen tube except the cavity for passing the preset guide wire can be used for passing a hard guide wire and a loach guide wire respectively.

5. The conveying device according to claim 1, characterized in that The multi-lumen tube comprises a main body section and a distal section, and the distal section of the multi-lumen tube comprises a convergent guide head.

6. The conveying device according to claim 5, characterized in that The distal section of the multi-lumen tube includes a tapered tip.

7. The conveying device according to claim 6, characterized in that The distal end section of the multi-lumen tube is biased to one side.

8. The conveying device according to claim 5, characterized in that The outlet of the cavity with the shortest axial length of the multi-lumen tube is arranged at the main body section of the multi-lumen tube.

9. The conveying device according to claim 1, characterized in that One preset guide wire is preset in all the branch openings.

10. The conveying device according to any one of claims 1 to 9, characterized in that: Also includes: A sub-stent delivery tube, used for delivering the sub-stent; The sheath core has a Tip head at the distal end, and the Tip head can reach the branch blood vessel.

11. The conveying device according to claim 10, characterized in that The main stent and / or the sub-stent are released in sections by means of coating and winding.

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