Delivery guidewire and delivery system

Abstract

The present invention relates to the technical field of medical device equipment, and provides a delivery guide wire and a delivery system, which aims to solve the technical problem that the proximal developing ring of the existing delivery guide wire is welded to the core shaft, which causes the stent to deform during the delivery of the delivery guide wire. The delivery guide wire includes a core shaft, which includes a limiting groove arranged on its outer peripheral surface; the proximal developing ring is sleeved on the outside of the core shaft, and the proximal developing ring includes a hollow cylinder and a clamp, the hollow cylinder includes an annular distal end face, the clamp is arranged on the distal end face, and the clamp is inserted into the limiting groove so that the proximal developing ring can rotate circumferentially relative to the core shaft. According to the delivery guide wire provided by the present invention, the core shaft includes a limiting groove, and the clamp of the proximal developing ring is inserted into the limiting groove so that the proximal developing ring can rotate relative to the core shaft, so that the stent abutting against the proximal developing ring is twisted during the twisting process, thereby avoiding the torsional deformation of the stent.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a delivery guide wire and a delivery system. Background Art

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

[0003] Intracranial aneurysms are mostly abnormal bulges on the walls of intracranial arteries, and are the leading cause of subarachnoid hemorrhage. Subarachnoid hemorrhage is one of the main types of hemorrhagic stroke in clinical practice. There are two main methods of treating aneurysms: surgical clipping and interventional treatment. Clinical trials have found that the mortality rate of interventional treatment for aneurysm patients is lower than that of surgical treatment.

[0004] At present, the endovascular interventional treatment of intracranial aneurysms is mainly based on coil embolization technology. This method focuses on the treatment of the aneurysm cavity, but this method is not perfect and still has many shortcomings, especially for the treatment of wide-necked aneurysms. Examination shows that the coil has dislocated or escaped, leading to occlusion of the tumor-bearing artery and the risk of ischemic complications. It is necessary to use an intracranial stent to assist in supporting the coil to ensure that the coil can be stable in the aneurysm.

[0005] See also Figure 1 , Figure 1 It is a schematic diagram of the structure of the existing delivery system 200. In order to ensure that the intracranial stent 201 can be smoothly delivered to the location of the aneurysm, the delivery system 200 needs to have sufficiently stable and reliable performance. Because during the pushing process of the intracranial stent 201, the axial pushing force of the delivery guide wire 202 is used to enable the intracranial stent 201 to overcome the friction between the intracranial stent 201 and the guide sheath 203, so as to achieve the purpose of delivering the intracranial stent 201. The developing film on the proximal end of the intracranial stent 201 is stuck between the two developing rings of the delivery guide wire 202 (i.e., the limiting part), and the developing film is in contact with the proximal developing ring 204, and the proximal developing ring 204 of the delivery guide wire 202 is fixed to the core shaft by welding and cannot rotate freely. During the operation, torque will be generated when the intracranial stent 201 passes through the tortuous blood vessels, and the proximal developing film of the intracranial stent 201 is in contact with the proximal developing ring 204. The friction between the two can overcome the torque generated when the intracranial stent 201 passes through the tortuous blood vessels. This makes the structure of the proximal part of the intracranial stent 201 unchanged, but other parts will be kinked, causing the intracranial stent 201 to deform, thereby affecting the delivery of the intracranial stent 201 and the release of the intracranial stent 201, resulting in failure of the operation. Summary of the invention

[0006] The purpose of the present invention is to at least solve the technical problem that the proximal developing ring of the existing delivery guide wire is welded to the core shaft, which causes the stent to be twisted and deformed during the delivery of the stent. This purpose is achieved through the following technical solutions:

[0007] The first aspect of the present invention provides a delivery guidewire, the delivery guidewire comprising:

[0008] A mandrel, the mandrel comprising a limiting groove arranged on its outer peripheral surface;

[0009] A proximal developing ring is sleeved on the outside of the core shaft, the proximal developing ring comprises a hollow cylinder and a clamp, the hollow cylinder comprises an annular distal end face, the clamp is arranged on the distal end face, the clamp is inserted into the limiting groove so that the proximal developing ring can rotate circumferentially relative to the core shaft.

[0010] According to the delivery guide wire provided by the present invention, a limiting groove is provided on the core shaft, and a clamping piece is provided on the distal end face of the proximal developing ring, and part of the clamping piece is clamped into the limiting groove, so that the proximal developing ring can rotate relative to the core shaft. In use, the delivery guide wire is used to push the stent, and the delivery guide wire mainly pushes the stent through the proximal developing ring. When the delivery guide wire pushes the stent through a tortuous blood vessel, a torque force is generated to rotate the stent, and the first developing film on the proximal end of the stent abuts against the clamping piece of the proximal developing ring. The friction between the first developing film of the stent and the clamping piece drives the clamping piece to twist. Since the clamping piece is provided in the limiting groove of the core shaft, the clamping piece can rotate circumferentially in the limiting groove of the core shaft, and the proximal developing ring also rotates with the stent, which enables the proximal end of the stent to rotate, and the stent can rotate as a whole without torsional deformation.

[0011] In addition, the delivery guide wire according to the present invention may also have the following additional technical features:

[0012] In some embodiments of the present invention, the limiting groove is a fan-shaped groove, and the circumferential angle range of the fan-shaped groove is 80 degrees to 90 degrees.

[0013] In some embodiments of the present invention, the limiting groove is an annular groove whose circumferential angle is 360 degrees, and the clamping member is a clamping ring, which is coaxially arranged with the hollow cylinder, and the clamping ring is sleeved in the annular groove to form a clamping connection.

[0014] In some embodiments of the present invention, there are multiple limit grooves, which are circumferentially spaced on the outer circumferential surface of the core shaft; there are multiple clamps, which are circumferentially spaced on the distal end surface; and each clamp is inserted into one limit groove.

[0015] In some embodiments of the present invention, the clamping member includes a radial clamping member, and part of the radial clamping member is clamped into the limiting groove.

[0016] In some embodiments of the present invention, the clamp further comprises an axial clamp, the axial clamp comprising a first end and a second end disposed opposite to each other in the axial direction, the first end being connected to the distal end surface, and the radial clamp being disposed on the second end.

[0017] In some embodiments of the present invention, the radial clamping member includes a distal surface, and a clamping groove is formed on the distal surface of the radial clamping member.

[0018] In some embodiments of the present invention, the length dimension of the clamp is in the range of 0.8 mm to 1.0 mm.

[0019] In some embodiments of the present invention, the delivery guide wire also includes a head end developing spring and a distal end developing ring, and the head end developing spring, the distal end developing ring and the proximal end developing ring are sequentially sleeved on the core shaft from the distal end to the proximal end.

[0020] A second aspect of the present invention provides a conveying system, comprising:

[0021] The delivery guide wire according to the first aspect of the present invention;

[0022] A guide sheath, the guide sheath forming an inner cavity, the delivery guide wire being disposed in the inner cavity;

[0023] The bracket is located in the inner cavity and is sleeved on the core shaft. The bracket includes a first developing film arranged at its proximal end, and the first developing film is abutted or clamped with the clamp.

[0024] In the delivery system provided by the second aspect of the present invention, the guide sheath protects the delivery guide wire and the stent and controls the stent in a contracted state for easy delivery. The delivery guide wire can push the stent to the lesion site. When the delivery system passes through a circuitous blood vessel, the first development film of the stent is aligned with the proximal development ring.

[0025] However, since the card is inserted into the limiting groove of the mandrel, the proximal end developing ring can rotate circumferentially relative to the mandrel, so that the proximal end developing ring can rotate along with the bracket.

[0026] The bracket rotates together, and when the bracket rotates, the proximal developing ring abutting or clamping with the first developing sheet at the proximal end of the bracket also rotates, so that the bracket can be rotated as a whole, avoiding torsional deformation of the bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 5 Various other advantages and benefits will be apparent from the following detailed description of the preferred embodiments.

[0028] It will become clear to those skilled in the art. The accompanying drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the present invention. Also, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0029] Figure 1 The structural diagram of the existing conveying system is schematically shown.

[0030] Figure 2 An axial cross-sectional view of a delivery guide wire according to a third embodiment of the present invention is schematically shown.

[0031] Figure 3 Schematically shows Figure 2 EE cross-sectional view of the delivery guidewire.

[0032] Figure 4 The structural diagram of the core shaft according to the third embodiment of the present invention is schematically shown.

[0033] Figure 5 Schematically shows Figure 4 AA section view of the mandrel.

[0034] Figure 6 A perspective view of a proximal developing ring according to a third embodiment of the present invention is schematically shown.

[0035] Figure 7 The schematic diagram of the structure of the core shaft and the proximal developing ring according to the third embodiment of the present invention is schematically shown.

[0036] Figure 8 The schematic diagram of the structure of the delivery guide wire and the stent according to the third embodiment of the present invention is shown schematically.

[0037] Fig. 9 Schematically shows Figure 8 A partial enlarged view of the C area.

[0038] Fig.10 The schematic diagram of the structure of the delivery guide wire and the stent according to the fourth embodiment of the present invention is shown schematically.

[0039] Fig.11 Schematically shows Fig.10 A partial enlarged view of area B.

[0040] Fig.12 The structural diagram of the proximal developing ring according to the fourth embodiment of the present invention is schematically shown.

[0041] Fig.13 The schematic structural diagram of the mandrel according to the fifth embodiment of the present invention is shown schematically.

[0042] Fig.14 Schematically shows Fig.13 DD cross-sectional view of the mandrel in FIG.

[0043] Fig.15 A perspective view of a proximal developing ring according to a fifth embodiment of the present invention is schematically shown.

[0044] Fig.16 A side view of a proximal developing ring according to a fifth embodiment of the present invention is schematically shown.

[0045] Fig.17 Schematically shows Fig.16 FF cross-sectional view of the mid-proximal development ring.

[0046] Fig.18 The structural diagram of the conveying system according to the first embodiment of the second aspect of the present invention is schematically shown.

[0047] Fig.19 The structural diagram of the conveying system according to the second embodiment of the second aspect of the present invention is schematically shown.

[0048] Fig. 20 The structural diagram of the bracket is schematically shown.

[0049] Description of reference numerals:

[0050] 200: existing delivery system; 201: intracranial stent; 202: delivery guide wire; 203: guide sheath; 204: proximal development ring;

[0051] 1: Delivery guide wire;

[0052] 10: mandrel; 11: limiting groove;

[0053] 20: proximal developing ring; 21: hollow cylinder; 211: distal end surface; 212: mandrel hole; 22: clamping piece; 221: radial clamping piece; 2211: clamping groove; 222: axial clamping piece;

[0054] 30: head end developing spring;

[0055] 40: distal development ring;

[0056] 2: bracket; 23: first developing film; 24: tubular body;

[0057] 3: Introducer sheath;

[0058] 100: Conveying system. DETAILED DESCRIPTION

[0059] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0060] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0061] 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.

[0062] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0063] 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 herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0064] It should be noted that in this application, the range expressed by "a value to another value" is a summary expression method to avoid listing all the values ​​in the range one by one in the specification. Therefore, the description of a specific numerical range covers any value in the numerical range and a smaller numerical range defined by any value in the numerical range, just as if the arbitrary value and the smaller numerical range were explicitly written in the specification.

[0065] In this application, the end closer to the operator during use is called the "proximal end", and the end farther from the operator is called the "distal end", and the "proximal end" and "distal end" of any component of the delivery guidewire are defined based on this principle. "Axial" generally refers to the length direction of the delivery guidewire, "radial" generally refers to the direction of the delivery guidewire perpendicular to its "axial direction", and "circumferential" generally refers to the direction of the cylindrical axis around the delivery guidewire, and the "axial", "radial" and "circumferential" of any component of the delivery guidewire are defined based on this principle.

[0066] See also Figures 2 to 7 A first aspect of the present invention provides a delivery guide wire 1, which includes a core shaft 10 and a proximal developing ring 20 sleeved on the outside of the core shaft 10, the core shaft 10 includes a limiting groove 11 arranged on its outer peripheral surface, and the proximal developing ring 20 includes a clamping member 22, which is clamped into the limiting groove 11 so that the proximal developing ring 20 can rotate circumferentially relative to the core shaft 10.

[0067] The delivery guide wire 1 provided by the present invention has a limiting groove 11 on the mandrel 10, a proximal developing ring 20 is integrally sleeved on the outside of the mandrel 10, a clamp 22 is provided on the distal end face 211 of the proximal developing ring 20, and a part of the clamp 22 is clamped into the limiting groove 11, so that the proximal developing ring 20 can rotate circumferentially relative to the mandrel 10. In use, the delivery guide wire 1 is used to push the stent 2. The delivery guide wire 1 mainly pushes the stent 2 through the proximal developing ring 20. When the delivery guide wire 1 pushes the stent 2 through a tortuous blood vessel, a torque force is generated. , causing the bracket 2 to rotate, the first developing film 23 on the proximal end of the bracket 2 abuts or clamps with the clamp 22 of the proximal developing ring 20, and the friction between the first developing film 23 of the bracket 2 and the clamp 22 drives the clamp 22 to twist. Since the clamp 22 is arranged in the limiting groove 11 of the core shaft 10, the clamp 22 can rotate along the circumferential direction in the limiting groove 11 of the core shaft 10, and the proximal developing ring 20 also rotates with the bracket 2, which makes the proximal end of the bracket 2 also rotate, and the bracket 2 can rotate as a whole without torsional deformation.

[0068] See also Figure 4 and Figure 5 , the mandrel 10 is a multi-gradient variable diameter straight wire structure, which includes a distal shaft and a proximal shaft connected to each other along the circumferential direction, the outer diameter of the distal shaft of the mandrel 10 is thinner, and the outer diameter of the proximal shaft of the mandrel 10 is thicker. The proximal developing ring 20 is sleeved on the distal shaft of the mandrel 10. The proximal developing ring 20 is sleeved at the limiting groove 11 of the mandrel 10. The length range of the mandrel 10 is 1840 mm to 1860 mm. The outer diameter range of the mandrel 10 is 0.07 mm to 0.38 mm. A limiting groove 11 is provided on the distal shaft of the mandrel 10, and the limiting groove 11 is provided on the outer peripheral surface of the distal shaft. In one embodiment, the limiting groove 11 is a fan-shaped groove, which has a certain circumferential angle. The circumferential angle range of the fan-shaped groove is 80 degrees to 90 degrees. The circumferential angle range of the fan-shaped groove is the rotatable angle of the proximal developing ring 20 relative to the mandrel 10. The circumferential angle range of the fan-shaped groove is 80 to 90 degrees, that is, the proximal developing ring 20 can rotate 80 to 90 degrees relative to the mandrel 10. The proximal developing ring 20 can rotate a larger angle relative to the mandrel 10. In this way, during use, even if the bracket 2 rotates significantly, the proximal developing ring 20 can also rotate with the bracket 2 without being restricted by the mandrel 10. The width range of the fan-shaped groove is 0.22 mm to 0.25 mm, and the depth range is 0.05 to 0.06 mm. The width and depth of the fan-shaped groove are large, so that the clamp 22 can be firmly inserted into the fan-shaped groove, so that the clamp 22 is firmly connected to the fan-shaped groove and is not easy to detach. In one embodiment, there are multiple fan-shaped grooves, and the multiple fan-shaped grooves are circumferentially spaced on the outer peripheral surface of the mandrel 10. In one embodiment, there are three fan-shaped grooves, and the three fan-shaped grooves are circumferentially spaced.

[0069] See also Figure 6 and Figure 7 , the proximal developing ring 20 includes a hollow cylinder 21 and a clamp 22. The hollow cylinder 21 is a tubular structure, and a core shaft hole 212 is formed along its axial direction. The core shaft 10 passes through the core shaft hole 212 so that the proximal developing ring 20 is sleeved on the outer circumferential surface of the core shaft 10, and the hollow cylinder 21 can rotate relative to the core shaft 10. The core shaft hole 212 makes the distal end face 211 and the proximal end face of the hollow cylinder 21 both annular. The clamp 22 and the hollow cylinder 21 can be an integral structure or a split structure. The function of the proximal developing ring 20 is to serve as a release developing mark. In the process of the conveying guide wire 1 pushing the stent 2, the proximal developing ring 20 of the conveying guide wire 1 passes through the distal end of the guide sheath 3, thereby releasing the stent 2.

[0070] The length of the proximal developing ring 20 (including the entirety of the hollow cylinder 21 and the clamp 22) ranges from 1.5 mm to 2.0 mm, the inner diameter ranges from 0.18 mm to 0.20 mm, and the outer diameter ranges from 0.35 mm to 0.40 mm. The length of the clamp 22 ranges from 0.18 mm to 1.0 mm. The maximum value of the outer diameter of the clamp 22 should not exceed the inner diameter of the guide sheath 3, so that the proximal developing ring 20 can be assembled inside the guide sheath 3.

[0071] Example 1

[0072] In this embodiment, the clamp 22 only includes a radial clamp 221 (excluding an axial clamp 222), and the radial clamp 221 extends radially so that the radial clamp 221 can be inserted into the limiting groove 11. The distal end face 211 of the hollow cylinder 21 is annular, so the distal end face 211 includes an outer circumference and an inner circumference arranged radially at intervals, and the inner circumference defines the mandrel hole 212. In one embodiment. The radial clamp 221 extends radially from the outer circumference of the distal end face 211 to the inner circumference, and further extends radially to the top of the mandrel hole 212 inside the inner circumference, and the limiting groove 11 is formed on the mandrel 10 to accommodate the radial clamp 221. The radial clamp 221 is an elongated rectangular parallelepiped, with a similar length and width, and a thin thickness. Its length direction is consistent with the radial direction of the hollow cylinder 21, and its width direction is consistent with the axial direction of the hollow cylinder 21. In this embodiment, there are three clamping members 22, which are circumferentially spaced apart on the annular distal end surface 211. The three clamping members 22 are inserted into the three limiting grooves 11, so that the connection between the clamping members 22 and the core shaft 10 is firm and not easy to be separated.

[0073] By means of the structure in which the radial clamping piece 221 of the proximal developing ring 20 is clamped into the limiting groove 11 of the core shaft 10, the proximal developing ring 20 can be fixed on the core shaft 10. At the same time, the proximal developing ring 20 can rotate circumferentially relative to the core shaft 10, but the proximal developing ring 20 will not fall off the core shaft 10 and shift. In this way, during use, when the guide wire 1 is conveyed to push the stent 2, the proximal developing ring 20 can rotate along with the first developing film 23 at the proximal end of the stent 2 to protect the stent 2 from torsional deformation.

[0074] Example 2

[0075] In this example, see Fig.10 and Fig.11 , the clamp 22 only includes a radial clamp 221 (excluding an axial clamp 222), and the radial clamp 221 includes a distal face and a proximal face that are arranged opposite to each other along the axial direction. A clamping groove 2211 is formed on the distal face of the radial clamp 221. The proximal face of the radial clamp 221 is connected to the distal end face 211 of the hollow cylinder 21. The clamping groove 2211 is square, and includes a bottom face and two opposite side walls connected to the bottom face. It can be understood that the shape of the clamping groove 2211 is not limited, as long as the clamping groove 2211 can be clamped with the developer film. A clamping groove 2211 is formed on the distal face of each clamp 22. In use, the proximal end of the bracket 2 is provided with a first developer film 23, and the distal end is provided with a second developer film. The first developer film 23 of the bracket 2 is clamped into a clamping groove 2211 to fix the first developer film 23 to the radial clamp 221, thereby fixing the proximal end of the bracket 2 to the distal end of the proximal developer ring 20.

[0076] When the delivery guide wire 1 pushes the stent 2 through a tortuous blood vessel, the stent 2 rotates. The first developing film 23 at the proximal end of the stent 2 is snapped into the slot 2211 to fix the first developing film 23 of the stent 2 to the radial clamp 221, so that the proximal end of the stent 2 is fixed to the distal end of the proximal developing ring 20. The rotation of the stent 2 drives the radial clamp 221 to rotate, but a part of the radial clamp 221 is arranged in the limiting slot 11. In this way, through the limiting slot 11, the radial clamp 221 can rotate circumferentially relative to the core shaft 10, which enables the proximal end of the stent 2 to rotate as well, and the stent 2 can rotate as a whole without torsional deformation.

[0077] In addition, the slot 2211 structure can prevent the first developing sheet 23 of the stent 2 from slipping when the clearance between the stent 2 and the guide sheath 3 is too large, thereby increasing the stability of the transfer between the stent 2 and the delivery guide wire 1.

[0078] Example 3

[0079] See also Figure 6 and Figure 7In this embodiment, the clamp 22 includes an axial clamp 222 and a radial clamp 221. The axial clamp 222 includes a first end and a second end that are arranged opposite to each other, and the first end and the second end are located at two ends in the axial direction. The first end is fixed to the distal end face 211, and the first end is located in the annular surface of the distal end face 211 to prevent the first end of the axial clamp 222 from affecting the mandrel 10 passing through the mandrel hole 212. In one embodiment, the first end of the axial clamp 222 is square, which extends from the outer circumference of the distal end face 211 to the inner circumference, so that the width of the axial clamp 222 is the largest and its strength is maximized. The axial clamp 222 is a rectangular parallelepiped as a whole, and its length is greater than its width. The thickness direction is consistent with the thickness direction of the radial clamp 221, the length direction of the axial clamp 222 is consistent with the axial direction of the hollow cylinder 21, and its width direction is consistent with the radial direction of the hollow cylinder 21. The shape of the second end of the axial clamp 222 is the same as the shape of its first end. The radial clamp 221 is located at the second end of the axial clamp 222. The radial dimension of the radial clamp 221 is greater than the radial dimension of the axial clamp 222. The axial clamp 222 includes a proximal surface and a distal surface. The proximal surface of the axial clamp 222 is connected to the distal end surface 211 of the hollow cylinder 21. The radial clamp 221 includes a proximal surface and a distal surface. The proximal surface of the radial clamp 221 is connected to the distal surface of the axial clamp 222. In the present embodiment, the axial clamp 222 and the radial clamp 221 are an integral structure. It can be understood that the proximal developing ring 20 as a whole can also be an integral structure. The radial clamp 221 is spaced apart from the hollow cylinder 21, and the axial clamp 222 is located between the radial clamp 221 and the hollow cylinder 21. However, the vertical projection of the radial clamp 221 on the distal end face 211 of the hollow cylinder 21 is located within the inner circumference of the distal end face 211, that is, within the core shaft hole 212. In this way, after the proximal developing ring 20 is assembled with the core shaft 10, the radial clamp 221 can be inserted into the limiting groove 11 of the core shaft 10.

[0080] See also Figure 8 and Fig. 9 During the process of conveying the stent 2, the conveying guide wire 1 is sleeved on the outside of the conveying guide wire 1, and the first developing film 23 at the proximal end of the stent 2 abuts against the radial clamping piece 221 of the clamping piece 22. Specifically, the first developing film 23 abuts against the distal end surface of the radial clamping piece 221 of the clamping piece 22.

[0081] The material of the clamp 22 is platinum-iridium alloy, platinum-tungsten alloy, tungsten or tantalum.

[0082] The delivery guide wire 1 also includes a head end developing spring 30 and a distal end developing ring 40, and the head end developing spring 30, the distal end developing ring 40 and the proximal end developing ring 20 are sequentially sleeved on the mandrel 10 from the distal end to the proximal end. The head end developing spring 30 and the distal end developing ring 40 can be fixed on the mandrel 10 by welding.

[0083] The delivery guide wire 1 is a multi-gradient variable diameter straight wire structure, which has the function of pushing support, and can push the stent 2 to the lesion site during use. In this embodiment, the length of the delivery guide wire 1 ranges from 1840 mm to 1860 mm, and the outer diameter ranges from 0.16 mm to 0.38 mm.

[0084] The function of the head end development spring 30 is to observe the distal positioning of the delivery system 100. The distal head of the head end development spring 30 is a spherical structure, and its material can be a polymer material or metal tin. The diameter range of the distal head is 0.15 mm to 0.20 mm. The spherical structure of the distal end of the head end development spring 30 facilitates the movement of the delivery guide wire 1 in the guide sheath 3. The length range of the head end development spring 30 is 4.0 mm to 13 mm, and the outer diameter range is 0.16 mm to 0.20 mm. The material of the head end development spring 30 can be a platinum tungsten alloy, a platinum iridium alloy or a precious metal such as gold.

[0085] The distal developing ring 40 is a hollow cylindrical structure with a length of 0.9 mm to 1.5 mm, an inner diameter range of 0.18 mm to 0.20 mm, and an outer diameter range of 0.20 mm to 0.30 mm. The material of the distal developing ring 40 can be platinum-tungsten alloy, platinum-iridium alloy, tungsten or tantalum. The function of the distal developing ring 40 is to serve as a recovery developing mark. During use, when the position of the stent 2 needs to be adjusted, the position of the distal developing ring 40 can be observed to ensure that the distal developing ring 40 does not exceed the distal end of the guide sheath 3, otherwise the stent 2 in the contracted state may detach from the guide sheath 3 and open to the expanded state, thereby losing control of the stent 2.

[0086] Example 4

[0087] See also Fig.10 , Fig.11 and Fig.12 In this embodiment, the clamping member 22 includes an axial clamping member 222 and a radial clamping member 221. The radial clamping member 221 includes a distal end surface. A clamping groove 2211 is formed on the distal end surface of the radial clamping member 221. The structure and beneficial effects of the clamping groove 2211 are the same as those of the clamping groove 2211 in Embodiment 2.

[0088] Example 5

[0089] See 13 and Fig.14 In this embodiment, the limiting groove 11 on the mandrel 10 is an annular groove, that is, the circumferential angle of the limiting groove 11 is 360 degrees. The mandrel 10 may be formed with one limiting groove or two limiting grooves spaced apart along the axial direction.

[0090] See also Figures 15 to 17In this embodiment, the proximal developing ring 20 is cylindrical as a whole, and includes a hollow cylinder 21 located in the middle and a clamp 22 located on the end surface of the hollow cylinder 21. In this embodiment, the clamp 22 is a clamp ring, and the clamp ring includes a first clamp ring and a second clamp ring. The first clamp ring is located on the distal end surface of the hollow cylinder 21, and the second clamp ring is located on the proximal end surface of the hollow cylinder 21. It can be understood that the first clamp ring and the second clamp ring can be an integral structure with the hollow cylinder 21. A mandrel hole 212 is formed in the hollow cylinder 21, and the snap ring is coaxially arranged with the hollow cylinder 21. The snap ring is also hollow cylindrical in shape, and a snap hole 221 is formed inside it. The snap hole 221 is coaxially arranged with the mandrel hole 212, and the diameter of the snap hole 221 is smaller than the diameter of the mandrel hole 212. In this way, when the proximal developing ring 20 is sleeved on the outside of the mandrel 10, the hollow cylinder 21 is used to sleeve the outside of the non-limiting groove of the mandrel 10, and the snap ring is used to sleeve the outside of the limiting groove of the mandrel 10. If the mandrel 10 is formed with a limiting groove, the proximal developing ring 20 can include only one clamp 22, which is a clamp ring. If the mandrel 10 is formed with two annular limiting grooves 11, the proximal developing ring 20 should include two clamps 22, and the two clamp rings are respectively inserted into the two annular limiting grooves 11.

[0091] See also Fig.18 and Fig.19 A second aspect of the present invention provides a conveying system 100, the conveying system 100 comprising:

[0092] A delivery guide wire 1 according to the first aspect of the present invention;

[0093] A guide sheath 3, the guide sheath 3 comprises an inner cavity, and the delivery guide wire 1 is arranged in the inner cavity;

[0094] The support 2 is located in the inner cavity and is sleeved on the core shaft 10. Fig. 20 The stent 2 includes a tubular body 24 and a developing sheet. The tubular body 24 includes a proximal end and a distal end. The developing sheet includes a first developing sheet 23 arranged at the proximal end of the tubular body 24 and a second developing sheet arranged at the distal end of the tubular body 24 .

[0095] The inner diameter of the inner cavity of the guide sheath 3 remains constant from the distal end to the proximal end. The inner diameter of the guide sheath 3 is larger than the outer diameter of the delivery guide wire 1, so that the delivery guide wire 1 can move from the proximal end to the distal end in the inner cavity of the guide sheath 3 to push the stent 2.

[0096] The stent 2 is a tubular structure, which includes two states: a contracted state and an expanded state. The stent 2 is arranged in the guide sheath 3 in a contracted state. After the transported guide wire 1 is pushed out of the guide sheath 3, the stent 2 expands to an expanded state. In one embodiment, the stent 2 is an intracranial stent. The proximal and distal ends of the stent 2 are provided with developing films, which can be used to observe the position of the stent 2. The number of first developing films 23 can be the same as the number of clamps 22 of the proximal developing ring 20. In use, each first developing film 23 is axially abutted or clamped with a clamp 22. In one embodiment, three first developing films 23 are circumferentially spaced apart at the proximal end of the stent 2, and three second developing films are circumferentially spaced apart at the distal end of the stent 2.

[0097] See also Fig.18 In the embodiment where the clamping piece 22 of the proximal developing ring 20 of the delivery guide wire 1 does not include the clamping groove 2211, that is, the delivery guide wire 1 of the embodiment 1 and the embodiment 3 of the first aspect of the present invention, the three first developing sheets 23 at the proximal end of the stent 2 are located between the distal developing ring 40 and the proximal developing ring 20 of the delivery guide wire 1, that is, the three first developing sheets 23 at the proximal end of the stent 2 are respectively abutted against the distal end surfaces of the radial clamping pieces 221 of the three clamping pieces 22, so as to prevent the stent 2 from shifting and achieve the effect that the stent 2 can be delivered under the push of the delivery guide wire 1. Please refer to Fig.19 In the embodiment in which the clamping member 22 of the proximal developing ring 20 of the conveying guide wire 1 includes a clamping groove 2211, that is, the conveying guide wire 1 of Embodiment 2 and Embodiment 4 of the first aspect of the present invention, the three first developing films 23 located at the proximal end of the bracket 2 are respectively clamped with the clamping grooves 2211 on the distal surfaces of the three radial clamping members 221.

[0098] In the delivery system 100 provided in the second aspect of the present invention, the guide sheath 3 protects the delivery guide wire 1 and the stent 2, and controls the stent 2 in a contracted state for easy delivery. The delivery guide wire 1 can push the stent 2 to the lesion site. When the delivery system 100 passes through a circuitous blood vessel, each first developing film 23 at the proximal end of the stent 2 abuts or clamps with the distal end surface of the radial clamp 221 of a clamp 22 of the proximal developing ring 20. However, since the clamp 22 is clamped into the limiting groove 11 of the mandrel 10, the proximal developing ring 20 can rotate circumferentially relative to the mandrel 10, so that the proximal developing ring 20 rotates with the stent 2. In this way, when the stent 2 rotates, the proximal developing ring 20 abutting or clamping with the first developing film 23 at the proximal end of the stent 2 also rotates, so that the stent 2 can achieve overall rotation, avoiding torsional deformation of the stent 2.

[0099] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A delivery guide wire, characterized in that: The delivery guide wire comprises: A mandrel, the mandrel comprising a limiting groove arranged on its outer peripheral surface, the limiting groove having a circumferential angle; A proximal developing ring, which is sleeved on the outside of the core shaft, comprises a hollow cylinder and a clamp, wherein the hollow cylinder comprises an annular distal end face, the clamp is arranged on the distal end face, a portion of the clamp is inserted into the limiting groove so that the proximal developing ring can rotate circumferentially relative to the core shaft, and the range of the circumferential angle is the rotatable angle of the proximal developing ring relative to the core shaft.

2. The delivery guide wire according to claim 1, characterized in that: The limiting groove is a fan-shaped groove, and the circumferential angle range of the fan-shaped groove is 80 degrees to 90 degrees.

3. The delivery guide wire according to claim 1, characterized in that: The limiting groove is an annular groove, and its circumferential angle is 360 degrees. The clamping member is a clamping ring, and the clamping ring is coaxially arranged with the hollow cylinder. The clamping ring is sleeved in the annular groove to form a clamping connection.

4. The delivery guide wire according to claim 1, characterized in that: There are multiple limiting grooves, which are circumferentially spaced on the outer circumferential surface of the core shaft; there are multiple clamping parts, which are circumferentially spaced on the distal end surface, and each clamping part is clamped into one limiting groove.

5. The delivery guide wire according to claim 1, characterized in that: The clamping piece includes a radial clamping piece, and the radial clamping piece is clamped into the limiting groove.

6. The delivery guide wire according to claim 5, characterized in that: The clamp further comprises an axial clamp, the axial clamp comprising a first end and a second end which are arranged opposite to each other in the axial direction, the first end being connected to the distal end surface, and the radial clamp being arranged on the second end.

7. The delivery guide wire according to claim 5 or claim 6, characterized in that: The radial clamping member comprises a distal end surface, and a clamping groove is formed on the distal end surface of the radial clamping member.

8. The delivery guide wire according to claim 1, characterized in that: The length dimension of the clamp is in the range of 0.8 mm to 1.0 mm.

9. The delivery guide wire according to claim 1, characterized in that: The conveying guide wire also includes a head end developing spring and a distal end developing ring. The head end developing spring, the distal end developing ring and the proximal end developing ring are sequentially sleeved on the core shaft from the distal end to the proximal end.

10. A conveying system, characterized in that: The delivery system comprises: The delivery guidewire according to any one of claims 1 to 9; A guide sheath, the guide sheath forming an inner cavity, the delivery guide wire being disposed in the inner cavity; A bracket is located in the inner cavity and sleeved on the core shaft. The bracket includes a first developing film arranged at its proximal end, and the first developing film is abutted or clamped with the clamp.

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