Guide head structure and conveying system

Abstract

The invention relates to a guiding head structure and a conveying system.The guiding head structure comprises a guiding section and a main body section, the near end of the guiding section is in smooth transition connection with the far end of the main body section, when the guiding head structure is subjected to external force, at least one of the guiding section and the main body section can deform, and the guiding section and the main body section can deform. The maximum outer diameter of the guide head structure is larger than the maximum outer diameter of the guide head structure in a natural state. The conveying system comprises a sheath tube, a sheath core and a guiding head structure, the guiding head structure further comprises a wrapping section, the wrapping section is connected with the near end of the main body section, the far end of the sheath core is connected with the wrapping section, the sheath tube is arranged on the sheath core in a sleeving mode, the sheath tube can move relative to the sheath core and the guiding head structure, and the guiding head structure is connected with the sheath core in a sleeving mode. The far end of the sheath tube can move towards the guide head and wrap the wrapping section. The guide head structure can be prevented from scratching the blood vessel wall, and the use safety of the product is improved.

Description

Technical Field

[0001] The present invention relates to the field of interventional medicine, and particularly to a guiding head structure and a delivery system. Background Art

[0002] With the development of the medical device industry, a new treatment technology has gradually emerged clinically, namely endovascular treatment technology. Endovascular interventional treatment belongs to minimally invasive treatment, with a small incision. Through arterial puncture, relevant instruments can be introduced into the lesion area, and then a stent is released to achieve the treatment effect. This treatment causes less trauma to patients, has less impact on human functions, can reduce the occurrence of complications in patients, and the postoperative recovery is relatively fast.

[0003] For interventional devices, it is necessary to consider the bending performance of the delivery sheath when passing through the aortic arch, the guiding performance of the guiding head at the front end of the delivery sheath, and the anti-displacement performance required by the delivery system when releasing the stent. Among them, the design of the tip head structure at the front end of the delivery device should not only have good guiding performance but also not be too long and narrow. When treating patients with Stanford type A aortic dissection, since the rupture lesion occurs in the ascending aorta region, and the length of this region is limited. If the tip head of the front end of the delivery sheath is designed too long and narrow, it may cause damage to the aortic valve and may also cause blood reflux at the aortic valve during the operation; if the tip head of the front end of the delivery sheath is designed too short, it may not be able to smoothly guide the entire stent delivery system to move in the curved section of the arterial blood vessel, and thus the stent cannot be sent to the lesion position in the ascending aorta or aortic arch section. Summary of the Invention

[0004] To overcome the problems existing in the prior art, the present invention provides a novel guiding head structure and a delivery system.

[0005] The solution of the present invention to solve the technical problem is to provide a guiding head structure, which includes a guiding section and a main body section. The proximal end of the guiding section is smoothly and transitionally connected to the distal end of the main body section. When the guiding head structure is subjected to an external force, at least one of the guiding section and the main body section can generate deformation, so that the maximum outer diameter of the guiding head structure is greater than the maximum outer diameter of the guiding head structure in its natural state.

[0006] In some embodiments of the present invention, a plurality of first through grooves are formed along the axial direction on the main body section, and a plurality of deformed main bodies spaced apart by the first through grooves are provided. The plurality of first through grooves and the deformed main bodies are alternately and evenly arranged in the circumferential direction of the main body section. The first through grooves penetrate the inner and outer surfaces of the main body section, and the plurality of deformed main bodies can generate deformation through the plurality of first through grooves; a bending portion that bends outward or inward of the deformed main body is provided on the deformed main body.

[0007] In some embodiments of the present invention, the tube wall of the guiding section is arranged in a wavy fold to form a shortening structure, and the shortening structure is arranged at the distal end of the guiding section.

[0008] In some embodiments of the present invention, the inner wall of the guiding section is arranged in a wavy concave-convex shape to form a shortening structure, and the shortening structure extends from the proximal end to the distal end of the guiding section.

[0009] The solution of the present invention to solve the technical problem is to provide a delivery system for delivering a medical device to a lesion area during interventional therapy. The delivery system includes a sheath tube, a sheath core, and a guiding head structure as described in any one of the above. The guiding head structure further includes a covering section, the covering section is connected to the proximal end of the main body section, the distal end of the sheath core is connected to the covering section, the sheath tube is sleeved on the sheath core, and the sheath tube can move relative to the sheath core and the guiding head structure. The distal end of the sheath tube can move towards the guiding head structure and cover the covering section.

[0010] In some embodiments of the present invention, a second through groove penetrating the inner and outer surfaces of the guiding section is provided at the distal end of the guiding section. A tearing groove is provided between two adjacent second through grooves of the guiding section, and the tearing groove penetrates the inner and outer surfaces of the guiding section. The delivery system further includes a pulling structure, the pulling structure can move relative to the guiding head structure, the pulling structure includes a pulling main body and a clamping structure, the clamping structure is arranged at the distal end of the pulling structure, the pulling main body passes through the second through groove so that the clamping structure is arranged inside the guiding section, and the size of the clamping structure is larger than the size of the second through groove.

[0011] In some embodiments of the present invention, the pulling structure further includes a sleeve, the sleeve is coaxially arranged with the sheath tube and the sheath core, the sleeve can move relative to the sheath tube, the guiding head structure and the sheath core, the sleeve is sleeved on the sheath tube, or the sleeve is sleeved on the sheath core and received inside the sheath tube; a damping structure is provided in the second through groove.

[0012] In some embodiments of the present invention, the proximal end of the pulling main body is connected to the sleeve, the sleeve moves towards the proximal end to drive the pulling main body to move towards the proximal end, the movement of the pulling main body drives the clamping structure to move towards the proximal end, and when the clamping structure moves towards the proximal end, it can abut against the inner surface of the guiding section, so that the guiding section deforms from the distal end along the tearing groove towards the proximal end.

[0013] In some embodiments of the present invention, a receiving cavity penetrating from the proximal end to the distal end of the sheath tube is provided inside the sheath tube, or the delivery system further includes a delivery tube body, the delivery tube body is arranged on the inner wall or the outer wall of the sheath tube, and the delivery tube body is arranged along the length direction of the sheath tube.

[0014] In some embodiments of the present invention, the proximal end of the pulling body enters from the distal end of the receiving cavity or the conveying tube body and exits from the proximal end of the receiving cavity or the conveying tube body. Pulling the proximal end of the pulling body causes the pulling body to move towards the proximal end. The movement of the pulling body drives the clamping structure to move towards the proximal end. When the clamping structure moves towards the proximal end, it can abut against the inner surface of the guiding section, thereby causing the guiding section to deform from the distal end along the tearing groove towards the proximal end.

[0015] Compared with the prior art, a guiding head structure and a conveying system of the present invention have the following advantages: Since the first through groove is provided in the guiding head structure, the supporting performance of the deformation body is relatively weak. Therefore, when the guiding head structure contacts the blood vessel wall, the deformation body will deform towards the outer side of the guiding head structure. Therefore, the force of the guiding head structure abutting against the blood vessel wall will be converted into the elastic potential energy of the deformation of the deformation body, thereby unloading the force of the guiding head structure abutting against the blood vessel wall and avoiding scratching the blood vessel wall by the guiding head structure, improving the safety of product use. At the same time, since the above setting does not require the guiding head structure to be reduced in length, the anti-displacement performance of the guiding head structure is not affected. Therefore, the guiding head structure can not only avoid scratching the blood vessel wall during the conveying process, but also take into account the anti-displacement performance of the guiding head structure, thereby greatly improving the product performance and the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the guiding head structure provided by the first embodiment of the present invention.

[0017] Figure 2 is a structural schematic diagram of the guiding head structure provided by the first embodiment of the present invention after compression deformation.

[0018] Figure 3 is a cross-sectional structural schematic diagram of the guiding head structure provided by the first embodiment of the present invention.

[0019] Figure 4 is a three-dimensional structural schematic diagram of another embodiment of the guiding head structure provided by the first embodiment of the present invention.

[0020] Figure 5 is a cross-sectional structural schematic diagram of another embodiment of the guiding head structure provided by the first embodiment of the present invention.

[0021] Figure 6 is a three-dimensional structural schematic diagram of another embodiment of the guiding head structure provided by the first embodiment of the present invention.

[0022] Figure 7Schematic diagram of the cooperation state of the conveying system provided by the second embodiment of the present invention and the guiding head structure of the first embodiment.

[0023] Figure 8 Schematic diagram of the cooperation state of the conveying system provided by the second embodiment of the present invention and the guiding head structure of the third embodiment.

[0024] Figure 9 Schematic diagram of the cooperation state of the guiding section of the guiding head structure provided by the third embodiment of the present invention and the pulling structure.

[0025] Figure 10 Is Figure 8 Enlarged view of part A in

[0026] Figure 11 Schematic diagram of the state change of the conveying system provided by the second embodiment of the present invention and the guiding head structure of the third embodiment.

[0027] Figure 12 Schematic diagram of the separated state of the guiding section of the guiding head structure and the pulling structure provided by the third embodiment of the present invention.

[0028] Figure 13 Schematic diagram of the guiding head structure and the conveying system in the prior art when being conveyed to the aortic arch.

[0029] Figure 14 Schematic diagram of the guiding head structure and the conveying system in the third embodiment of the present invention when being conveyed to the aortic arch.

[0030] Figure 15 Schematic cross-sectional structure diagram of the conveying system provided by the second embodiment of the present invention and the guiding head structure of the third embodiment.

[0031] Explanation of the attached drawing reference numerals:

[0032] 100, guiding head structure; 11, guiding section; 12, main body section; 121, first through groove; 122, deformed main body; 111, guide wire cavity; 1221, bending part; 112, shortening structure; 200, conveying system; 21, sheath tube; 22, sheath core; 23, pulling structure; 13, covering section; 300, guiding head structure; 321, second through groove; 31, guiding section; 32, main body section; 312, tearing groove; 231, pulling main body; 232, clamping structure; 233, sleeve; 313, blocking structure. Detailed implementation manners

[0033] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0034] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the 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 combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0035] Although the terms first, second, third, etc. may be used herein 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 may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms when used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0036] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation in addition to the orientations depicted in the figure. For example, if the device in the figure is flipped, an element described as "below" or "beneath" another element or feature will then be oriented as "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both upward and downward orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0037] To more clearly describe the structure of the present application, the terms "proximal end" and "distal end" are defined herein as commonly used terms in the field of interventional medicine. Specifically, the "distal end" refers to the end away from the operator during the surgical operation, the "proximal end" refers to the end close to the operator during the surgical operation, the "axial direction" refers to its length direction, and the "radial direction" refers to the direction perpendicular to the "axial direction".

[0038] Please refer to Figure 1 and Figure 2 , a guiding head structure 100 is provided in the first embodiment of the present invention. The guiding head structure 100 is used in interventional therapy and functions as a catheter, sheath, or transporter for establishing a path, delivering medical devices, etc., and provides guidance and anti-displacement performance for catheters, sheaths, transporters, etc. In the first embodiment of the present invention, the guiding head structure 100 is described in detail by taking a transporter for delivering a vascular stent as an example.

[0039] The guiding head structure 100 includes a guiding section 11 and a main body section 12. The proximal end of the guiding section 11 is smoothly and transitionally connected to the distal end of the main body section 12. A plurality of first through slots 121 are formed by cutting along the axial direction on the main body section 12, and a plurality of deformable bodies 122 spaced apart by the first through slots 121 are provided. The plurality of first through slots 121 and the deformable bodies 122 are alternately and evenly arranged in the circumferential direction of the main body section 12, and the first through slots 121 penetrate the inner and outer surfaces of the main body section 12. When the guiding head structure 100 is axially squeezed, the plurality of deformable bodies 122 can deform through the plurality of first through slots 121.

[0040] Specifically, please combine Figure 3, both the guiding section 11 and the main body section 12 are hollow structures. The guiding section 11 and the main body section 12 have a wire guiding cavity 111 that communicates with each other. The wire guiding cavity 111 is for a guide wire to pass through. The guiding head structure 100 can move along the path established by the guide wire to the lesion location. The guiding section 11 is in a frustum shape, and the outer diameter of the guiding section 11 gradually decreases from the proximal end to the distal end of the guiding section 11, so that the guiding section 11 can play a guiding role. The proximal end of the guiding section 11 is smoothly and transitionally connected to the distal end of the main body section 12 to ensure that the outer surface of the guiding head structure 100 is flat and smooth, and to prevent the guiding head structure 100 from scratching the blood vessel wall. In a specific embodiment of the invention, cutting is performed from the proximal end to the distal end of the main body section 12, and the cutting direction is the axial direction, so as to cut out a plurality of first through grooves 121 that penetrate the inner and outer surfaces of the main body section 12. After a part of the proximal end of the main body section 12 is cut off, a deformed main body 122 that is alternately arranged with the plurality of first through grooves 121 is formed. That is, the arrangement manner of the plurality of first through grooves 121 and the deformed main body 122 in the circumferential direction of the main body section 12 is: adjacent to a first through groove 121 in the clockwise direction is a deformed main body 122, adjacent to this deformed main body 122 in the clockwise direction is another first through groove 121, adjacent to the other first through groove 121 in the clockwise direction is another deformed main body 122, and so on. At the same time, the first through grooves 121 and the deformed main body 122 are evenly arranged in the circumferential direction of the main body section 12. When the guiding head structure is pushed in the blood vessel and encounters a blood vessel with a large bending amplitude, due to the too large bending amplitude of the blood vessel, the distal end of the guiding head structure will abut against the blood vessel wall on the large bending side of the blood vessel. Since the guiding head structure has a certain supportability and hardness, the guiding head structure may scratch the blood vessel. Through the above setting of the guiding head structure 100 in the present invention, when the guiding head structure 100 abuts against the blood vessel wall on the large bending side of the blood vessel, because the guiding head structure 100 is subjected to the abutting force of the blood vessel wall and the pushing force for pushing the guiding head structure 100, and the above abutting force and pushing force are forces in opposite directions, the guiding head structure 100 will be axially compressed. At this time, since the guiding head structure 100 is provided with the first through grooves 121, the support performance of the deformed main body 122 is weak, so the deformed main body 122 will deform in the outer direction of the guiding head structure 100, such as Figure 2As shown. Therefore, the force of the guiding head structure 100 against the blood vessel wall will be converted into the elastic potential energy of the deformation main body 122 to generate deformation, thereby unloading the force of the guiding head structure 100 against the blood vessel wall, avoiding scratching the blood vessel wall by the guiding head structure 100, and improving the safety of product use. At the same time, since the above setting does not require the guiding head structure 100 to be reduced in length, the anti-displacement performance of the guiding head structure 100 is not affected. Therefore, the guiding head structure 100 can not only avoid scratching the blood vessel wall during transportation, but also take into account the anti-displacement performance of the guiding head structure 100, thereby greatly improving the product performance and use safety.

[0041] It should be noted that the length of the first through groove 121 can be adaptively set according to the actual use scenario. For example, when there is no large bend in the blood vessel passed by the guiding head structure 100, the length of the first through groove 121 can be adaptively shortened. When there is a large bend in the blood vessel passed by the guiding head structure 100, the length of the first through groove 121 can be adaptively increased. The position where the first through groove 121 is provided can also be adaptively set according to the bending direction of the blood vessel. For example, if the blood vessel passed by the guiding head structure 100 only bends to one side, the first through groove 121 can be provided only on one side of the main body section 12.

[0042] Please continue to refer to Figure 1 , a bending portion 1221 that bends outward or inward of the deformation main body 122 is provided on the deformation main body 122. Specifically, when a bending portion 1221 that bends outward of the deformation main body 122 is provided on the deformation main body 122, the guiding head structure 100 abuts against the blood vessel wall, and then the deformation main body 122 is subjected to an axial compression force. The bending portion 1221 that bends outward can ensure that the deformation main body 122 bends outward of the deformation main body 122, ensuring that the deformation main body 122 can generate a large amount of deformation, and avoiding the situation that the deformation main body 122 bends inward, resulting in insufficient deformation of the deformation main body 122 and unable to pass through the blood vessel smoothly. When the bending amplitude of the blood vessel passed by the guiding head structure 100 is small, a bending portion 1221 that bends inward of the deformation main body 122 can be provided on the deformation main body 122. When the guiding head structure 100 abuts against the blood vessel wall, the deformation main body 122 generates a certain deformation inward, so that the guiding head structure 100 can adaptively bend along the bending direction of the blood vessel, and then the guiding head structure 100 can smoothly pass through the bent blood vessel.

[0043] Furthermore, please refer to Figures 4 to 6, in the first embodiment of the present invention, to further reduce the risk of the guiding head structure 100 scratching the blood vessel wall, the inner wall of the guiding section 11 is provided with a wavy concavo-convex shape to form a shortening structure 112, and the shortening structure 112 extends from the proximal end to the distal end of the guiding section 11. By forming the shortening structure 112 on the inner wall of the guiding section 11, the wall thickness of the guiding section 11 is made uneven. When the distal end of the guiding section 11 abuts against the blood vessel wall, the shortening structure 112 deforms under force. The position where the wall of the guiding section 11 is relatively thick bulges outward, and the position where the wall of the guiding section 11 is relatively thin depresses inward. The guiding section 11 as a whole collapses to form a wrinkled shape, as Figure 6 shown, so that the force of the distal end of the guiding section 11 abutting against the blood vessel wall is dispersed during the process of the guiding section 11 collapsing as a whole, avoiding the guiding section 11 from scratching the blood vessel wall.

[0044] In other specific embodiments of the present invention, the distal end of the guiding section 11 can also be directly set to be in a wrinkled shape as Figure 6 shown. Specifically, the wall of the guiding section 11 is folded in a wavy shape to form a shortening structure 112, and this shortening structure 112 itself is in a wrinkled structure. The shortening structure 112 is provided at the distal end of the guiding section 11. When the distal end of the guiding section 11 abuts against the blood vessel wall, the shortening structure 112 deforms under force, that is, the shortening structure 112 is compressed axially as a whole, so that the force of the distal end of the guiding section 11 abutting against the blood vessel wall is dispersed on the shortening structure 112, thereby avoiding the guiding section 11 from scratching the blood vessel wall.

[0045] Please refer to Figure 7 , the second embodiment of the present invention provides a delivery system 200 for delivering a medical device to a lesion area during interventional therapy. The delivery system 200 includes a sheath 21, a sheath core 22, and the guiding head structure 100 provided in the first embodiment of the present invention. The guiding head structure 100 further includes a covering section 13, and the covering section 13 is connected to the proximal end of the main body section 12. The distal end of the sheath core 22 is connected to the covering section 13. The sheath 21 is sleeved on the sheath core 22, and the sheath 21 can move relative to the sheath core 22 and the guiding head structure 100. The distal end of the sheath 21 can move towards the guiding head structure 100 and cover the covering section 13.

[0046] It should be noted that when the distal end of the sheath tube 21 wraps the wrapped section 13, the proximal end of the wrapped section 13, the outer surface of the sheath core 22, and the inner surface of the sheath tube 21 together form the loading section of the stent, and the stent is compressed and loaded in the loading section. When the stent needs to be released, the sheath tube 21 can be retracted to expose the stent from the sheath tube 21, and then the stent can be deployed and released. The delivery system further includes a handle, and the movement of the sheath tube 21 is controlled through the handle.

[0047] Please refer to Figures 8 to 10 , the third embodiment of the present invention provides a guiding head structure 300 and a delivery system. The delivery system of the third embodiment of the present invention can directly adopt the delivery system 200 of the second embodiment. The main difference between the guiding head structure 300 and the guiding head structure 100 provided in the first embodiment of the present invention is that: a second through groove 321 extends from the distal end to the proximal end of the guiding section 31, and the second through groove 321 penetrates the inner and outer surfaces of the guiding section 31. A tearing groove 312 is provided between two adjacent second through grooves 321 of the guiding section 31, that is, a tearing groove 312 is provided between every two adjacent second through grooves 321, and the tearing groove 312 penetrates the inner and outer surfaces of the guiding section 31. Further, the delivery system 200 further includes a pulling structure 23, the pulling structure 23 can move relative to the guiding head structure 300, and the pulling structure 23 includes a pulling main body 231 and a clamping structure 232. The clamping structure 232 is arranged at the distal end of the pulling structure 23, the pulling main body 231 passes through the distal end of the second through groove 321, and then the pulling main body 231 moves a short distance towards the proximal end so that the pulling main body 231 abuts against the inner wall of the second through groove 321. The clamping structure 232 is arranged inside the guiding section 31, and the size of the clamping structure 232 is larger than the size of the second through groove 321.

[0048] It should be noted that in the third embodiment of the present invention, the clamping structure 232 is a spherical structure, and the diameter of the clamping structure 232 is larger than the width of the first through groove 321, so that the clamping structure 232 can be clamped inside the guiding section 31, that is, because the size of the clamping structure 232 is larger than the size of the second through groove 321, the clamping structure 232 cannot pass through the second through groove 321.

[0049] Furthermore, the pulling structure 23 further includes a sleeve 233, and the proximal end of the pulling body 231 is connected to the sleeve 233. The sleeve 233 is coaxially arranged with the sheath 21 and the sheath core 22, and the sleeve 233 can move relative to the sheath 21, the guiding head structure 100, and the sheath core 22, that is, the movement of the sleeve 233 can be controlled independently. In the third embodiment of the present invention, the sleeve 233 is sleeved on the sheath 21, and the sleeve 233 can move along the length direction of the sheath 21 on the outer side of the sheath 21. When the guiding head structure 100 moves into a curved blood vessel, the sleeve 233 can be moved proximally. The proximal movement of the sleeve 233 further pulls the pulling body 231 to move proximally, and the movement of the pulling body 231 drives the clamping structure 232 to move proximally. Since the size of the clamping structure 232 is larger than the size of the second through groove 321, when the clamping structure 232 moves proximally, the clamping structure 232 abuts against the inner surface of the guiding section 31, and the force exerted by the clamping structure 232 on the inner surface of the guiding section 31 causes the guiding section 31 to have a tendency to turn outward and deform. When the pulling force exerted by the pulling body 231 towards the proximal end is large enough, the guiding section 31 starts to bend proximally along the tearing groove 312 from the distal end, deforming the guiding section 31 into a petal shape, as Figure 11 shown, so that the relatively hard and pointed distal end of the guiding section 31 is deformed into a relatively smooth structure, thereby avoiding scratching the blood vessel wall by the guiding section 31. At the same time, since the guiding section 31 is deformed into a petal shape, the guiding section 31 has good deformability, and when the guiding section 31 contacts the blood vessel wall, the damage to the blood vessel wall can also be reduced by the deformation of the guiding section 31. At the same time, the guiding head structure 300 of the third embodiment of the present invention is particularly suitable for delivering a stent in the aortic arch. As Figure 13 shown, when the existing guiding head structure delivers a stent in the aortic arch, since the aortic arch is relatively close to the aortic valve, the guiding head structure may pierce the aortic valve, thereby causing damage to the aortic valve. After the guiding section 31 of the guiding head structure 300 of the third embodiment of the present invention is deformed into a petal shape, the axial length of the guiding head structure 300 can be shortened, thereby avoiding the guiding head structure 300 from piercing the aortic valve, as Figure 14 shown.

[0050] It should be noted that the distal end of the guiding section 31 between two adjacent tearing grooves 312 turns towards the proximal end and the outside along the length directions of the two tearing grooves 312, and a plurality of the tearing grooves 312 are evenly arranged in the circumferential direction of the guiding section 31. Therefore, the distal end of the guiding section 31 turns and deforms evenly in all directions, and at the same time, it also ensures that the force acting on the distal end of the guiding section 31 is uniform, avoiding excessive force on one side of the distal end of the guiding section 31, which may cause the overall bending of the guiding section 31. When the turning deformation of the distal end of the guiding section 31 exceeds 90 degrees and the pulling structure 23 continues to move towards the proximal end, the pulling main body 231 can move along the second through groove 321 towards the distal end of the second through groove 321. Finally, the pulling main body 231 slips out from the distal end of the second through groove 321, so that the pulling main body 231 and the clamping structure 232 are separated from the guiding section 31, as Figure 12 shown. At this time, continue to withdraw the pulling structure 23 to make the pulling structure 23 away from the area where the stent is released, thereby avoiding the pulling structure 23 affecting the release of the stent. The pulling structure 23 can be withdrawn from the human body together with the sheath tube 21, or the pulling structure 23 can be withdrawn from the human body alone.

[0051] It should be noted that in the third embodiment of the present invention, the second through groove 321 is arranged at the distal end of the guiding section 31, and the second through groove 321 does not extend to the proximal end of the guiding section 31 or into the main body section 32, thereby ensuring that the clamping structure 232 is stuck at the distal end of the guiding section 31, and further ensuring that the pulling structure 23 can easily pull the distal end of the guiding section 31, so that the guiding section 31 can easily turn towards the proximal end and the outside along the length directions of the two tearing grooves 312. The width of the tearing groove 312 is small, thereby ensuring the supportability and strength of the distal end of the guiding section 31. The length of the tearing groove 312 can be adaptively set according to the actual situation. For example, when there is no large bend in the blood vessel passed by the guiding head structure 300, the length of the tearing groove 312 can be adaptively shortened; when there is a large bend in the blood vessel passed by the guiding head structure 300, the length of the tearing groove 312 can be adaptively increased. At the same time, in order to prevent the pulling main body 231 from slipping out of the second through groove 321 too easily, resulting in the inability of the distal end of the guiding section 31 to deform. A damping structure is provided on the groove wall in the second through groove 231. The damping structure can be silicone, and the damping structure can also be an elastic member with good elasticity. When the pulling main body 231 slides in the second through groove 231, the damping structure will increase the resistance of the pulling structure relative to the second through groove 231, thereby preventing the pulling main body 231 from slipping out of the second through groove 321 too easily.

[0052] Please refer toFigure 15 In other specific embodiments of the present invention, the sleeve 233 can also be sleeved on the sheath core 22 and received in the sheath tube 21. The sleeve 233 moves within the lumen of the sheath tube 21, thereby ensuring that the sleeve 233 will not scratch the blood vessel wall during movement. It should be noted that the proximal end of the sleeve 233 can be connected to the handle, and the movement of the sleeve 233 can be controlled by operating the handle.

[0053] In other specific embodiments of the present invention, the sleeve 233 can also be omitted. A receiving cavity that penetrates from the proximal end to the distal end of the sheath tube 21 is provided within the sheath tube 21. The proximal end of the pulling body 231 enters from the distal end of the receiving cavity and exits from the proximal end of the receiving cavity. By pulling the proximal end of the pulling body 231, the pulling structure 23 moves proximally relative to the sheath tube 21 within the receiving cavity. The movement of the pulling structure 23 drives the latching structure 232 to move proximally. When the latching structure 232 moves proximally, it can abut against the inner surface of the guiding section 31, thereby causing the guiding section 31 to deform proximally along the tearing groove 312 starting from the distal end. A receiving cavity for receiving the pulling structure 23 is provided within the sheath tube 21, thereby ensuring that the overall size of the distal end of the delivery system 200 is smaller, making it easier for the delivery system 200 to enter the human body and adaptable to more complex blood vessel paths. At the same time, it can also prevent the pulling structure 23 from contacting the blood vessel wall during movement and avoid the risk of the pulling structure 23 scratching the blood vessel wall.

[0054] In other specific embodiments of the present invention, the sleeve 233 can also be omitted. A delivery tube body is provided on the inner wall or outer wall of the sheath tube 21, and the delivery tube body is arranged along the length direction of the sheath tube 21. The proximal end of the pulling body 231 enters from the distal end of the delivery tube body and exits from the proximal end of the delivery tube body. By pulling the proximal end of the pulling body 231, the pulling structure 23 moves proximally relative to the sheath tube 21 within the delivery tube body. The movement of the pulling structure 23 drives the latching structure 232 to move proximally. When the latching structure 232 moves proximally, it can abut against the inner surface of the guiding section 31, thereby causing the guiding section 31 to deform proximally along the tearing groove 312 starting from the distal end. The delivery tube body can be fixed to the sheath tube 21 by hot melting. Providing a delivery tube body for the pulling structure 23 directly on the sheath tube 21 can reduce the manufacturing difficulty and cost of the overall delivery system.

[0055] Compared with the prior art, a guiding head structure and a conveying system of the present invention have the following advantages: Since the guiding head structure is provided with the second through groove, the supporting performance of the deformable main body is relatively weak. Therefore, when the guiding head structure contacts the blood vessel wall, the deformable main body will deform in the outer direction of the guiding head structure. Therefore, the force of the guiding head structure against the blood vessel wall will be converted into the elastic potential energy of the deformation of the deformable main body, thereby removing the force of the guiding head structure against the blood vessel wall and avoiding scratching the blood vessel wall by the guiding head structure, improving the safety of product use. At the same time, because the above setting does not require the guiding head structure to be reduced in length, the anti-displacement performance of the guiding head structure is not affected. Therefore, the guiding head structure can not only avoid scratching the blood vessel wall during the conveying process, but also take into account the anti-displacement performance of the guiding head structure, thereby greatly improving the product performance and use safety.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A seeker head structure, characterized in that: The guiding head structure includes a guiding section and a main body section. The proximal end of the guiding section is smoothly and transitionally connected to the distal end of the main body section. When the guiding head structure is subjected to an external force, at least one of the guiding section and the main body section can deform, such that the maximum outer diameter of the guiding head structure is greater than the maximum outer diameter of the guiding head structure in its natural state.

2. The leading head structure according to claim 1, characterized in that: A plurality of first through slots are formed axially on the main body section and a plurality of deformable bodies spaced apart by the first through slots. The plurality of first through slots and the deformable bodies are alternately and uniformly arranged circumferentially on the main body section. The first through slots penetrate the inner and outer surfaces of the main body section, and the plurality of deformable bodies can deform through the plurality of first through slots; a bending portion that bends outward or inward of the deformable body is provided on the deformable body.

3. The leading head structure according to claim 1, wherein: The tube wall of the guiding section is arranged in a wavy fold to form a shortening structure, and the shortening structure is arranged at the distal end of the guiding section.

4. The leading head structure according to claim 1, wherein: The inner wall of the guiding section is arranged in a wavy concave-convex shape to form a shortening structure, and the shortening structure extends from the proximal end to the distal end of the guiding section.

5. A delivery system for delivering a medical device to a lesion area during interventional therapy, characterized in that: The delivery system includes a sheath tube, a sheath core, and a guiding head structure according to any one of claims 1-4. The guiding head structure further includes a covering section. The covering section is connected to the proximal end of the main body section. The distal end of the sheath core is connected to the covering section. The sheath tube is sleeved on the sheath core, and the sheath tube can move relative to the sheath core and the guiding head structure. The distal end of the sheath tube can move towards the guiding head structure and cover the covering section.

6. The conveying system according to claim 5, wherein: A second through slot penetrating the inner and outer surfaces of the guiding section is provided at the distal end of the guiding section. A tearing slot is provided between two adjacent second through slots of the guiding section, and the tearing slot penetrates the inner and outer surfaces of the guiding section. The delivery system further includes a pulling structure. The pulling structure can move relative to the guiding head structure. The pulling structure includes a pulling body and a clamping structure. The clamping structure is arranged at the distal end of the pulling structure. The pulling body passes through the second through slot so that the clamping structure is arranged inside the guiding section, and the size of the clamping structure is greater than the size of the second through slot.

7. The conveying system according to claim 6, characterized in that: The pulling structure further includes a sleeve. The sleeve is coaxially arranged with the sheath tube and the sheath core. The sleeve can move relative to the sheath tube, the guiding head structure, and the sheath core. The sleeve is sleeved on the sheath tube, or the sleeve is sleeved on the sheath core and received inside the sheath tube; a damping structure is provided in the second through slot.

8. The conveying system according to claim 7, characterized in that: The proximal end of the pulling body is connected to the sleeve. The sleeve moves towards the proximal end, thereby driving the pulling body to move towards the proximal end. The movement of the pulling body drives the clamping structure to move towards the proximal end. When the clamping structure moves towards the proximal end, it can abut against the inner surface of the guiding section, thereby causing the guiding section to deform from the distal end along the tearing slot towards the proximal end.

9. The conveying system according to claim 6, characterized in that: A receiving cavity penetrating from the proximal end to the distal end of the sheath tube is provided inside the sheath tube, or the delivery system further includes a delivery tube body. The delivery tube body is arranged on the inner wall or the outer wall of the sheath tube, and the delivery tube body is arranged along the length direction of the sheath tube.

10. The conveying system according to claim 9, characterized in that: The proximal end of the pulling body enters from the distal end of the receiving cavity or the conveying tube body and exits from the proximal end of the receiving cavity or the conveying tube body. Pulling the proximal end of the pulling body causes the pulling body to move towards the proximal end. The movement of the pulling body drives the clamping structure to move towards the proximal end. When the clamping structure moves towards the proximal end, it can abut against the inner surface of the guiding section, thereby causing the guiding section to deform from the distal end along the tearing groove towards the proximal end.

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