Conveying guide wire and conveying system

Abstract

The invention provides a conveying guide wire and a conveying system. The conveying system comprises a support and the conveying guide wire. The conveying guide wire comprises a guide wire body and a loading component, the loading component is arranged on the guide wire body, and the loading component is used for loading a stent; a friction material is arranged on the outer surface of the loading component; and the friction material is used for being in contact with the bracket loaded on the loading component so as to increase the friction force between the loading component and the bracket. The delivery guide wire has good force conductivity and flexibility, and can effectively prevent the stent from being disloaded from the loading component, so that smooth implantation of the stent is ensured, and the success rate of an operation is improved.

Description

Technical Field

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

[0002] When treating intracranial aneurysms, an operator usually delivers a stent or a coil to the site to be treated through a delivery guide wire, and releases the stent or the coil to achieve the treatment effect. Currently, the conventional delivery process of the stent or the coil is as follows: The operator first constructs a passage in the patient's body to deliver the stent in the body from the introducer sheath to the microcatheter through the delivery guide wire; as the delivery guide wire reaches the diseased site of the patient, the operator releases the stent through the cooperation of the delivery guide wire and the microcatheter to occlude the aneurysm.

[0003] The current conventional stent delivery method is: matching a delivery element with the stent, and relying on the friction force between the two to deliver the stent to the diseased site of the patient through the delivery element. Among them, during the process of delivering the stent by the delivery element, if the delivery element itself is relatively soft and has a small outer diameter, it will lead to low force conduction performance during transmission of the delivery element, making it difficult to push the stent in the microcatheter. If the delivery element itself has a high hardness, the flexibility of the delivery element is poor, so it is difficult to smoothly pass through the curved part of the blood vessel. In addition, in the existing delivery method, due to the certain outer diameter of the delivery element, the outer diameter of the delivery element will increase after the stent is matched with the delivery element, making the strength of the delivery element increase while the flexibility decreases, thereby increasing the operation difficulty for the operator to deliver the stent.

[0004] In addition, if the stent fails to reach the diseased site accurately after being released, the operator needs to retrieve the stent and re-release it after adjusting the position of the stent. At this time, if the friction force between the stent and the delivery element is small, there is a risk that the stent will be unloaded inside the microcatheter, resulting in the failure of the operation. Therefore, the assembly method of the delivery element and the stent usually requires the stent to have a certain anti-unloading property and release property to ensure that the stent can be accurately released to the diseased site. The existing delivery elements usually cannot well balance the force conduction and flexibility, and the stent also cannot well balance the anti-unloading property and release property, resulting in difficult operation for the operator and unable to guarantee the surgical effect. Summary of the Invention

[0005] The purpose of the present invention is to provide a delivery guide wire and a delivery system. The delivery guide wire has good force conduction and flexibility, and can also effectively prevent the stent from being unloaded from the loading member, so it can ensure the smooth implantation of the stent and improve the success rate of the operation.

[0006] To achieve the above object, the present invention provides a delivery guide wire, comprising a guide wire body and a loading member, wherein the loading member is arranged on the guide wire body, and the loading member is used for loading a stent; a friction material is arranged on the outer surface of the loading member; the friction material is used to contact the stent loaded on the loading member to increase the frictional force between the loading member and the stent.

[0007] Optionally, a recess is arranged on the outer surface of the loading member, and the friction material is placed in at least part of the recess.

[0008] Optionally, the recess is a spiral groove arranged axially rotated along the loading member itself.

[0009] Optionally, the friction material fills at least part of the area of the spiral groove.

[0010] Or, after the friction material fills at least part of the area of the spiral groove, it further covers at least part of the outer surface of the loading member and / or the guide wire body.

[0011] Optionally, the maximum depth of the spiral groove in the radial direction of the loading member is less than the wire diameter of the stent loaded on the loading member.

[0012] Optionally, the guide wire body comprises a proximal region, the loading member and a distal region which are sequentially connected along the axial direction from the proximal end to the distal end; the outer surface of the loading member is arranged as a spiral blade, and the spiral blade encloses to form the spiral groove.

[0013] Optionally, the spiral blade is sequentially connected by a plurality of rotating segments arranged at intervals along the axial direction of the spiral blade; the outer circumferential surface of at least part of the rotating segments is used to connect the friction material to increase the outer diameter of the rotating segments, so that the outer diameters of all the rotating segments are the same.

[0014] Optionally, the rotating segment comprises a first rotating piece and a second rotating piece, and the outer diameter of the first rotating piece is greater than the outer diameter of the second rotating piece; all the first rotating pieces and all the second rotating pieces are alternately arranged in sequence in the axial direction of the spiral blade.

[0015] Optionally, in the direction from the proximal end to the distal end along the axis of the spiral blade, all the rotating segments are arranged in sequence according to the outer diameter size, so that the outer diameters of all the rotating segments gradually decrease or gradually increase.

[0016] Optionally, the outer contour of the loading member is frustum-shaped, the outer diameter of the proximal end of the loading member is greater than the outer diameter of the distal end of the loading member, or the outer contour of the loading member is cylindrical.

[0017] Optionally, in the direction from the proximal end to the distal end along the axis of the loading member, the width of the spiral groove gradually increases, and the depth of the spiral groove in the radial direction of the loading member gradually increases.

[0018] Optionally, the loading member is an elastic member and can elongate or contract in its own axial direction. The loading member is sleeved on the outer surface of the guide wire body; the loading member is used to contract and separate from the stent after the stent is released.

[0019] Optionally, the delivery guide wire further includes a control wire. The proximal end of the loading member is connected to the guide wire body, and the distal end of the loading member is separated from the guide wire body; the control wire is connected to the distal end of the loading member, and the control wire is used to drive the distal end of the loading member to move towards the proximal end of the loading member after the stent is released, so as to contract the stent.

[0020] Optionally, after the stent is crimped on the loading member, the shape of the loading member matches the shape of the guide wire body.

[0021] Optionally, after the stent is crimped on the loading member, the proximal end of the stent is aligned with the proximal end of the loading member in the radial direction of the stent. The length of the loading member in its own axial direction is greater than 2 mm, and the length of the loading member in its own axial direction is less than two-thirds of the length of the stent in the axial direction of the loading member.

[0022] Optionally, the friction material is a polymer material.

[0023] To achieve the above object, the present invention also provides a delivery system, including a stent and the delivery guide wire according to any one of the above. The stent is crimped on the loading member, and the delivery guide wire is used to drive the stent to move through the loading member.

[0024] The present invention provides a delivery guide wire and a delivery system. The delivery system includes a stent and a delivery guide wire. The delivery guide wire includes a guide wire body and a loading member. The loading member is arranged on the guide wire body. The loading member is used to load the stent; a friction material is arranged on the outer surface of the loading member. The friction material is used to contact the stent loaded on the loading member to increase the frictional force between the loading member and the stent.

[0025] A friction material is provided on the outer surface of the loading member. On the one hand, while maintaining the force conductivity of the loading member, the flexibility of the loading member can be improved, so that the distal end of the delivery guide wire takes into account both force conductivity and flexibility. The delivery guide wire arranged in this way can reduce the risk of damaging the inner wall of the blood vessel at the distal end of the delivery guide wire during the process of delivering the stent. On the other hand, after the stent is loaded on the loading member, it can be in contact with the friction material, increasing the friction force between the stent and the loading member, effectively reducing the risk of the stent being unloaded from the loading member, improving the anti-unloading property and release property of the stent, ensuring the smooth implantation of the stent, and improving the success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. 6 is a schematic structural diagram of a delivery guide wire and a stent in a preferred embodiment of the present invention, wherein the stent is crimped on the loading member of the delivery guide wire.

[0027] Figure 2 FIG. 10 is a schematic structural diagram of a guide wire body and a loading member in a preferred embodiment of the present invention;

[0028] Figure 3a FIG. 14 is a schematic structural diagram of the loading member in a right-handed state in a preferred embodiment of the present invention;

[0029] Figure 3b FIG. 18 is a schematic structural diagram of the loading member in a left-handed state in a preferred embodiment of the present invention;

[0030] Figure 4a FIG. 22 is a schematic axial sectional structural diagram of the loading member in a preferred embodiment of the present invention, wherein the rotating section is not connected with the friction material;

[0031] Figure 4b FIG. 26 is a schematic axial sectional structural diagram of the loading member in a preferred embodiment of the present invention, wherein the rotating section is already connected with the friction material;

[0032] Figure 5a FIG. 30 is a schematic axial sectional structural diagram of the loading member in another preferred embodiment of the present invention, wherein the rotating section is not connected with the friction material;

[0033] Figure 5b FIG. 34 is a schematic axial sectional structural diagram of the loading member in another preferred embodiment of the present invention, wherein the rotating section is already connected with the friction material;

[0034] Figure 6 FIG. 38 is a schematic structural diagram of the loading member in another preferred embodiment of the present invention.

[0035] In the figure: conveying guide wire 1; guide wire body 11; imaging element 111; loading member 12; head end 13; handle 14; sleeve 15; spiral blade 121; mandrel 122; first spiral groove 123; rotating section 124; first rotating piece 1241; second rotating piece 1242; second spiral groove 125; bracket 2; friction material 3. Detailed implementation manners

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are all in very simplified forms and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0037] The orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0038] As used in this specification, "distal end" generally refers to the end of the conveying guide wire that is far from the operator; the term "proximal end" is opposite to the "distal end" and generally refers to the end of the conveying guide wire that is close to the operator; the term "axial direction" refers to the axial direction of the bracket, that is, the axial direction of the loading member.

[0039] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The following will describe the exemplary embodiments of the present application in detail in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be mutually supplemented or combined.

[0041] Such as Figure 1 And Figure 2As shown in the figure, a preferred embodiment of the present invention provides a delivery guide wire 1, which includes a guide wire body 11 and a loading member 12. The loading member 12 is arranged on the guide wire body 11 and is used for loading a stent 2. The guide wire body 11 can drive the stent 2 to move synchronously through the loading member 12. Among them, the loading member 12 can be integrally formed with the guide wire body 11, or can be connected after being separately formed from the guide wire body 11. The stent 2 is press-gripped on the loading member 12 before implantation, and there is a frictional force between the stent 2 and the loading member 12. When the delivery guide wire 1 drives the stent 1 to move in a blood vessel, the loading member 12 can drive the stent 2 to move and be released by relying on the frictional force.

[0042] Further, a friction material is provided on the outer surface of the loading member 12, and the friction material is used to contact the stent 2 loaded on the loading member 12 to increase the frictional force between the loading member 12 and the stent 2.

[0043] With such a structure, the flexibility of the loading member 12 can be improved while maintaining the force conductivity of the loading member 12, so that the distal end of the delivery guide wire 1 takes into account both force conductivity and flexibility. The delivery guide wire 1 arranged in this way can reduce the risk of the distal end of the delivery guide wire 1 damaging the inner wall of the blood vessel during the process of delivering the stent 2. It should be understood that the above-mentioned force conductivity refers to the ability of the delivery guide wire 1 to smoothly deliver the stent 2 to the lesion site.

[0044] In addition, by providing a friction material on the outer surface of the loading member 12, the stent 2 can be in contact with the friction material after being loaded on the loading member 12, so that the frictional force between the stent 2 and the loading member 12 can be increased. In this way, when the guide wire body 11 drives the stent 2 to be released, the risk of the stent 2 being unloaded from the loading member 12 can be effectively reduced, the anti-unloading property and release property of the stent 2 can be improved, the smooth implantation of the stent 2 at the lesion site can be ensured, and the success rate of the operation can be improved.

[0045] Preferably, the friction coefficient of the friction material provided on the outer surface of the loading member 12 is 0.1-10, that is, a friction material with a friction coefficient between 0.1 and 10 can be provided on the outer surface of the loading member 12, so that there is a large frictional force between the loading member 12 and the stent 2, and thus the release and recovery of the stent 2 can be realized.

[0046] Specifically, if the stent 2 does not accurately reach the lesion site and the stent 2 is in an incompletely released state, the guide wire body 11 can recover the stent 2 by means of the frictional force between the loading member 12 and the stent 2 to improve the anti-unloading property of the guide wire body 11.

[0047] It should be noted that the stent 2 has good self-expanding performance and radial support force, and the stent 2 can be compressed and held on the loading member 12 and placed in the delivery pipeline. When the delivery pipeline moves to the lesion location, the stent 2 can extend out of the delivery pipeline and expand (i.e., dilate) under the drive of the guide wire body 11, and then be fixed on the inner wall of the blood vessel.

[0048] More specifically, the preparation materials of the stent 2 include but are not limited to nitinol alloy, cobalt-chromium alloy, etc. The stent 2 can be prepared by winding, cutting or braiding, and the stent 2 itself can have a radiopaque function.

[0049] The types of the friction material in this application are not limited. The friction material can be set as a polymer material, such as any one or a combination of polyether amide resin, thermoplastic polyurethane elastomer, silica gel, nylon, and acrylic polymer. After the friction material is injection molded and shaped in the recess of the loading member 12, the hardness of the loading member 12 can be reduced while maintaining the skeleton structure of the loading member 12, so that the loading member 12 not only has the softness of the polymer material but also maintains the force conductivity of the loading member 12, so as to achieve both flexibility and force conductivity at the distal end of the delivery guide wire 1, ensure that the delivery guide wire 1 can deliver the stent 1 to the lesion location, and can also avoid damaging the blood vessel during delivery.

[0050] A preferred embodiment of the present invention also provides a delivery system. The delivery system includes a delivery guide wire 1 and a stent 2. The stent 2 is compressed and held on the loading member 12, and the delivery guide wire 1 is used to drive the stent 2 to move through the loading member.

[0051] It should be known that the delivery system needs to have good flexibility and force conductivity so that the delivery system will not be bent or knotted when delivering in tortuous blood vessels.

[0052] In addition, the distal end of the delivery system should also have flexibility and radiopacity to avoid damaging the patient's blood vessel during the process of delivering the stent 2. It can also facilitate the doctor to know the specific position of the delivery system during delivery in time for the next operation.

[0053] Referring to Figure 1 As shown, in an example, a radiopaque element 111 can be installed at the position corresponding to the middle part of the stent 2 on the loading member 12, and another radiopaque element 111 can be installed at the position corresponding to the proximal end of the stent 2 on the loading member 12. The preparation materials of the radiopaque element 111 include but are not limited to platinum, iridium, tantalum, and noble metal alloys, etc.

[0054] Further, the delivery system further includes a delivery pipeline (not shown), which is used to sleeved outside the delivery guide wire 1 and the stent 2, that is, the stent 2 and the delivery guide wire 1 are movably arranged inside the delivery pipeline. When the stent is actually implanted, it can first move synchronously in the body through the delivery pipeline and the delivery guide wire 1 to deliver the stent 2 to the diseased position of the blood vessel, and then drive the stent 2 to move relative to the delivery pipeline through the delivery guide wire 1 until the stent 2 extends out of the distal end of the delivery pipeline, and the stent 2 can be released after breaking free from the restraint of the delivery pipeline.

[0055] Further, the delivery pipeline includes an introducer sheath and a microcatheter. The wire body 11 and the stent 2 can be slidably placed in the introducer sheath for implantation, and the introducer sheath is docked with the microcatheter during the operation. The operator pushes the stent 2 into the microcatheter through the wire body 11 and releases it into the diseased blood vessel through the microcatheter.

[0056] In a preferred embodiment, the microcatheter includes an inner layer, an outer layer, a diffusion stress tube, and a connection port. Among them, the outer layer is placed outside the inner layer, and both the inner layer and the outer layer can be set as a single-layer structure or a multi-layer structure. At least one imaging element 111 is sleeved at the distal end of the inner layer. In a specific example, one imaging element 111 is sleeved at the distal end of the inner layer, and at least one imaging element 111 can be sleeved at the remaining positions of the inner layer except the distal end position.

[0057] The preparation materials of the inner layer and the outer layer of the microcatheter can include one or a combination of several materials such as nylon elastomer (Pebax), nylon, polyurethane (PU), polytetrafluoroethylene (PTFE), high-density polyethylene (HDPE), nylon elastomer or polyolefin elastomer mixed with friction coefficient reducing additives, but should not be limited thereto. The inner layer and the outer layer of the microcatheter can further include a hollow structure prepared by materials such as stainless steel, nitinol alloy, cobalt-chromium alloy or polymer wire through weaving, spiraling or cutting.

[0058] Refer to Figure 1 As shown, the distalmost end of the wire body 11 is the head end 13 of the delivery guide wire 1, and the head end 13 is used to be preferentially implanted into the human body and move in the diseased blood vessel of the human body. The loading member 12 is arranged in the proximal region of the head end 13, and the arrangement position of the loading member 12 is preferably adjacent to the head end 13 to facilitate moving the stent 2 into the diseased position.

[0059] Continue to refer to Figure 1 The delivery guide wire 1 further includes a handle 14, and the handle 14 is connected to the wire body 11 at the proximal end of the wire body 11. The operator controls the movement of the wire body 11 in the blood vessel by operating the handle 14.

[0060] It should be noted that the area of the guide wire body 11 close to the handle 14 often needs to have a certain strength and hardness to improve the force conductivity of the delivery guide wire 1 and ensure that the operator can smoothly deliver the guide wire body 11 to the lesion site by operating the handle 14.

[0061] In a schematic embodiment, the delivery guide wire 1 further includes a sleeve 15 (refer to Figure 1 ), the sleeve 15 is sleeved outside the guide wire body 11 and is located in the area between the loading member 12 and the handle 14, so that the delivery guide wire 1 has a certain strength and further improves the force conductivity of the delivery guide wire 1.

[0062] More specifically, the sleeve 15 includes, but is not limited to, a cut Hypotube and a stepped spring. At the same time, the preparation materials of the sleeve 15 include, but are not limited to, stainless steel, nitinol alloy, etc. The fixing method of the sleeve 15 to the guide wire body 11 can be glue bonding, laser welding, resistance welding or pulse welding, etc.

[0063] The specific structure of the loading member 12 will be described.

[0064] Embodiment 1

[0065] Refer to Figure 2 As shown, a recess (not shown) is provided on the outer surface of the loading member 12, and a friction material (not shown) is placed in at least part of the recess. For example, the friction material can be injection molded in the recess. At this time, the frictional force between the friction material and the stent 2 is greater than the frictional force between the loading member 12 and the stent 2.

[0066] As a preferred embodiment, the recess is a spiral groove axially rotated along the loading member 12 itself. In an embodiment, the outer contour of the loading member 12 is cylindrical or frustum-shaped, the central axis of the loading member 12 coincides with the axis of the guide wire body 11, and the radial direction of the loading member 12 is parallel or coincides with the radial direction of the guide wire body 11. With such a configuration, the loading member 12 with a spiral groove can elongate along its own axis direction after the stent 2 is compressed, so as to reduce the outer diameter of the stent 2 after compression, so that there is a large gap between the stent 2 and the delivery pipeline, thereby reducing the pushing resistance of the stent 2 in the delivery pipeline and also reducing the risk of the stent 2 being unloaded in the delivery pipeline when moving relative to the delivery pipeline.

[0067] In a specific embodiment, the friction material fills at least part of the area of the spiral groove. For example, a polymer material can be injection molded in the spiral groove. With such a setting, the roughness of at least part of the outer surface of the loading member 12 can be increased. After the stent 2 is compressed on the loading member 12, it can contact the outer peripheral surface of the loading member 12 and the friction material in the spiral groove, thereby increasing the frictional force between the stent 2 and the loading member 12 after the stent 2 is compressed on the loading member 12.

[0068] In another specific embodiment, after the friction material fills at least part of the spiral groove, it further covers at least part of the outer surface of the loading member 12 and / or the guide wire body 11. That is, the friction material is also coated on at least part of the outer surface of the loading member 12 and / or at least part of the outer surface of the guide wire body 11. In this way, the coverage area of the friction material on the outer surface of the loading member 12 can be increased, that is, the contact area between the stent 2 and the friction material after the stent 2 is crimped on the loading member 12 is increased, which is convenient for further improving the anti-deployment and release properties of the stent 2.

[0069] Preferably, the maximum depth of the spiral groove in the radial direction of the loading member 12 is less than the wire diameter (i.e., the diameter) of the stent 2 loaded on the loading member 12 to ensure that a certain force conductivity is still maintained after the recess is formed on the loading member 12. In a specific example, the outer contour of the loading member 12 is cylindrical, and the maximum depth of the spiral groove in the radial direction of the loading member 12 is less than the radius of the loading member 12.

[0070] As an alternative solution, after the stent 2 is crimped on the loading member 12, the proximal end of the stent 2 and the proximal end of the loading member 12 are substantially aligned in the radial direction of the stent 2. The length of the loading member 12 in its own axial direction is greater than 2 mm, and the length of the loading member 12 in its own axial direction is less than two-thirds of the length of the stent 2 in the axial direction of the loading member 12. With such a setting, on the one hand, a large frictional force can be provided between the loading member 12 and the stent 2 to enable the loading member 12 to drive the stent 2 to move; on the other hand, the distal end of the stent 2 is not in contact with the loading member 12, which is convenient for the expansion of the stent 2.

[0071] Referring to Figure 2 、 Figure 3a and Figure 3b As shown, in a preferred embodiment, the guide wire body 11 includes a proximal region, a loading member 12, and a distal region that are sequentially connected along its own axial direction from the proximal end to the distal end. That is, the loading member 12 is the middle section of the guide wire body 1. The outer surface of the loading member 12 is provided with spiral blades 121, and the spiral blades 121 enclose to form a spiral groove.

[0072] In one example, the outer surface of the loading member 12 can be cut along its own circumferential direction to form spiral blades 121. In another example, the formed spiral blades 121 can also be fixedly connected to the outer peripheral surface of the loading member 12.

[0073] Referring to Figure 3a and Figure 3b As shown, in this embodiment, the loading member 12 includes spiral blades 121 and a mandrel 122. The spiral blades 121 are sleeved and fixed on the outer surface of the mandrel 122, and the spiral blades 121 and the mandrel 122 enclose to form a first spiral groove 123.

[0074] In Figure 3a , the width a of the first spiral groove 123 is the distance between adjacent rotating segments 124 in the axial direction of the loading member 12, the thickness b of the spiral blade 121 is the distance between the opposite end faces of the spiral blade 121 in the axial direction of the loading member 12, and the width a of the first spiral groove 123 is greater than the thickness b of the spiral blade 121 to increase the contact area between the friction material and the bracket 2.

[0075] Preferably, the depth c of the first spiral groove 123 in the radial direction of the loading member 12 is less than the maximum outer diameter d of the spiral blade 121 to ensure that the force conductivity of the loading member 12 with the first spiral groove 123 meets the requirements. It should be understood that the depth c of the first spiral groove 123 in the radial direction of the loading member 12 is equal to half of the difference between the maximum outer diameter d of the spiral blade 121 and the outer diameter e of the mandrel 122, that is, c = 1 / 2(d - e).

[0076] More specifically, the spiral blade 121 is formed by sequentially connecting a plurality of rotating segments 124 arranged at intervals along its own axial direction, and the cavities between adjacent rotating segments 124 penetrate through in sequence to form the first spiral groove 123. The friction material is used to fill at least part of the area of the first spiral groove 123, and the friction material can also cover at least part of the outer surface of the loading member 12 after filling to increase the contact area between the bracket 2 and the friction material.

[0077] Referring to Figures 4a to 5b shown, the friction material 3 is connected to the outer peripheral surface of at least part of the rotating segment 124 to increase the outer diameter of the rotating segment 124, so that the outer diameters of all rotating segments 124 are the same. The shape of the friction material 3 is preferably matched with the shape of the rotating segment 124. That is to say, the friction material 3 can be connected to the outer peripheral surface of the rotating segment 124 with a smaller outer diameter, and the friction material 3 is set to the shape of the rotating segment 124 to increase the outer diameter of the rotating segment 124 through the friction material 3, so that the outer diameters of all rotating segments 124 are the same.

[0078] With such a configuration, when the bracket 2 is pressed on the outer surface of the spiral blade 121, the bracket 2 can contact the friction material 3 outside the rotating segment 124 with a smaller outer diameter. This solution adjusts the height of the rotating segment 124 with a smaller outer diameter in the spiral blade 121 in the radial direction of the spiral blade 121 through the friction material 3. On the one hand, it makes the bracket 2 contact the friction material 3 to increase the friction force when the bracket 2 contacts the loading member 12; on the other hand, it can make the loading member 12 elongate along its own axial direction after the bracket 2 is pressed to further reduce the pushing resistance of the bracket 2 in the conveying pipeline.

[0079] Referring to Figure 4a and Figure 4bAs shown, in a specific solution, the rotating section 124 includes a first rotating piece 1241 and a second rotating piece 1242, and the outer diameter of the first rotating piece 1241 is greater than that of the second rotating piece 1242. All the first rotating pieces 1241 and all the second rotating pieces 1242 are alternately arranged in sequence along the axial direction of the helical blade 121. At this time, a friction material 3 can be connected to the outer peripheral surface of the second rotating piece 1242 so that the outer diameter of the second rotating piece 1242 is the same as that of the first rotating piece 1241. After the bracket 2 is pressed and held on the loading member 12, since the second rotating pieces 1242 are distributed at intervals along the axial direction of the loading member 12, the friction material is evenly distributed on the surface of the loading member 12, and further the friction force between the bracket 2 and the friction material 3 is evenly distributed, so as to facilitate the loading member 12 to drive the bracket 2 to move.

[0080] Referring to Figure 5a and Figure 5b As shown, in another specific solution, in the direction from the proximal end to the distal end along the axis of the helical blade 121, all the rotating sections 124 are arranged in sequence according to the outer diameter size, so that the outer diameters of all the rotating sections 124 gradually decrease or gradually increase.

[0081] In a preferred solution, the second rotating piece 1242 can be arranged at the proximal end of the loading member 12, and the first rotating piece 1241 can be arranged at the distal end of the loading member 12, and all the rotating sections 124 are arranged in sequence from the proximal end to the distal end of the loading member 12 in a manner that the outer diameter gradually increases according to the outer diameter size of all the rotating sections 124. At this time, after the bracket 2 is pressed and held on the loading member 12, the proximal end of the bracket 2 contacts the friction material 3 outside the second rotating piece 1242 to increase the friction force between the proximal end of the bracket 2 and the loading member 12. Similarly, all the rotating sections 124 can also be arranged in sequence from the proximal end to the distal end of the loading member 12 in a manner that the outer diameter gradually decreases to increase the friction force between the distal end of the bracket 2 and the loading member 12.

[0082] Referring to Figure 2 As shown, after the bracket 2 is pressed and held on the loading member 12, the shape of the loading member 12 matches the shape of the guide wire body 11. At this time, the outer diameter of the loading member 12 is preferably equal to or slightly larger than the outer diameter of the adjacent part of the guide wire body 11.

[0083] In an embodiment, the outer diameter of the guide wire body 11 gradually decreases in the direction from the proximal end to the distal end along its own axis, and the outer contour of the loading member 12 is frustum-shaped, that is, the outer diameter of the loading member 12 also gradually decreases in the direction from the proximal end to the distal end along its own axis. Among them, the maximum outer diameter of the loading member 12 is preferably equal to or slightly larger than the outer diameter of the proximal region of the adjacent guide wire body 11, and the minimum outer diameter of the loading member 12 is preferably equal to or slightly larger than the outer diameter of the distal region of the adjacent guide wire body 11.

[0084] In another embodiment, the outer contour of the loading member 12 may also be cylindrical, and the outer diameter of the loading member 12 matches the outer diameter of the adjacent guide wire body 11, that is, the outer diameters of the two ends of the loading member 12 are preferably equal to or slightly larger than the outer diameter of the adjacent guide wire body 11.

[0085] Referring Figure 6 As shown, in yet another preferred embodiment, a second helical groove 125 is rotationally provided along the axial direction of the loading member 12 on its outer surface, and the axis of the second helical groove 125 coincides with the axis of the guide wire body 11.

[0086] As a preferred example, in the direction of the axis of the loading member 12 from the proximal end to the distal end, the width of the second helical groove 125 in the axial direction of the loading member 12 gradually increases, and the depth of the second helical groove 125 in the radial direction of the loading member 12 gradually increases. In this way, the flexibility of the distal end of the loading member 12 can be improved, so that the loading member 12 and the stent 2 can smoothly pass through the tortuous part of the blood vessel.

[0087] Of course, in another example, in the direction of the axis of the loading member 12 from the proximal end to the distal end, the width of the second helical groove 125 is evenly distributed in the axial direction of the loading member 12, and the depth of the second helical groove 125 in the radial direction of the loading member 12 is also evenly distributed. At this time, the flexibility and force conduction of the loading member 12 at each position in its own axial direction are the same.

[0088] Referring Figure 3a and Figure 6 As shown, both the first helical groove 123 and the second helical groove 125 include multiple layers of grooves arranged at intervals along the axial direction of the loading member 12. The distance between adjacent layers of grooves in the second helical groove 125 is preferably greater than the distance between adjacent layers of grooves in the first helical groove 123. That is to say, the first helical groove 123 is arranged more densely in the axial direction of the loading member 12, and the second helical groove 125 is arranged more sparsely in the axial direction of the loading member 12.

[0089] In addition, in the axial direction of the loading member 12, the width of the second helical groove 125 is preferably smaller than the width of the first helical groove 123; and in the radial direction of the loading member 12, the depth of the second helical groove 125 is preferably smaller than the depth of the first helical groove 123. That is to say, the size of the first helical groove 123 on the loading member 12 is smaller, while the size of the second helical groove 125 on the loading member 12 is larger.

[0090] When constructed in this way, the loading member 12 provided with the second helical groove 125 has good force conductivity and is generally applicable to conveying large-sized stents 2. The loading member 12 provided with the first helical groove 123 has good flexibility and can easily pass through tortuous blood vessels, and is generally applicable to stents 2 with a relatively far lesion site or those that need to pass through tortuous blood vessels to reach the lesion site. The operator can select a delivery guide wire 1 with a suitable loading member 12 according to needs for delivering the stent 2.

[0091] Embodiment 2

[0092] In this embodiment, the loading member 12 is integrally formed with the guide wire body 11. The loading member 12 is an elastic member (not shown) and can elongate or contract in its own axial direction. The loading member 12 is sleeved on the outer surface of the guide wire body 11. The loading member 12 is used to contract after the stent 2 is released, so that the stent 2 is separated from the loading member 12.

[0093] In an alternative embodiment, the loading member 12 can be designed as a spring. When the stent 2 is pressed and held on the loading member 12, the spring is in a stretched state. After the stent 2 is released, the stent 2 is separated from the loading member 12, and the spring automatically contracts after losing the external force to return to its initial length.

[0094] In another alternative embodiment, the delivery guide wire 1 further includes a control wire (not shown). The proximal end of the loading member 12 is connected to the guide wire body 11, the distal end of the loading member 12 is separated from the guide wire body 11, and the middle part of the loading member 12 (that is, the area of the loading member 12 other than the proximal and distal ends) can be connected to or separated from the guide wire body 11. The control wire is connected to the distal end of the loading member 12, and the control wire is used to drive the distal end of the loading member 12 to move towards the proximal end of the loading member 12 after the stent 2 is released.

[0095] More specifically, during the pushing process of the stent 2, the loading member 12 is in an initial state, so that the stent 2 and the loading member 12 have a large contact area, improving the delivery effect of the stent 2 and preventing relative displacement between the stent 2 and the loading member 12. After the stent 2 reaches the lesion position and releases a part of its length, the operator can pull the control wire from the distal end to the proximal end, so that the distal end of the loading member 12 contracts towards the proximal end of the loading member 12. At this time, the length of the loading member 12 is shortened, thereby realizing the separation of the loading member 12 from the stent 2 to achieve the purpose of releasing the stent 2.

[0096] This application does not limit the connection method between the stent 2 and the loading member 12. The loading member 12 can be connected to the stent 2 by welding or bonding, etc.

[0097] In a specific embodiment, the outer surface of the loading member 12 is rotationally cut along its own axis to form a helical blade. The distal end of the helical blade has at least one receiving hole, and the loading member 12 has a hollow accommodation cavity along its own axis. The receiving hole and the accommodation cavity are communicated. One end of the control wire is fixed (such as welded or glued) in the receiving hole, and the other end passes through the receiving hole and the accommodation cavity and then is connected to the handle 14.

[0098] In a preferred example, there are two receiving holes inside the helical blade at the outermost distal end. The two receiving holes are symmetrically arranged with respect to the central axis of the helical blade, that is, the two receiving holes are spaced 180° in the circumferential direction of the helical blade, and each receiving hole is communicated with the accommodation cavity. The number of control wires is two. One end of each control wire is fixed in a corresponding receiving hole, and the other end passes through the receiving hole and the accommodation cavity and then is connected to the handle 14. After the stent 2 releases most of its length, the operator can pull the two control wires to make the distal end of the loading member 12 contract towards the proximal end, thereby realizing the complete release of the stent 2.

[0099] In summary, the present invention provides a delivery guide wire and a delivery system. The outer surface of the loading member 12 is provided with a friction material, so that while maintaining the force conductivity of the loading member 12, the flexibility of the loading member 12 can be improved, and further, the distal end of the delivery guide wire 1 can take into account both force conductivity and flexibility. The delivery guide wire 1 arranged in this way can reduce the risk of damaging the inner wall of the blood vessel at the distal end of the delivery guide wire 1 during the process of delivering the stent 2.

[0100] In addition, by providing a friction material on the outer surface of the loading member 12, the stent 2 can be in contact with the friction material after being loaded on the loading member 12. Therefore, the friction force between the stent 2 and the loading member 12 can be increased, and the risk of the stent 2 being unloaded from the loading member 12 can be effectively reduced. The anti-unloading property and release property of the stent 2 can be improved, ensuring the smooth implantation of the stent 2 and improving the success rate of the operation.

[0101] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention according to the above disclosure belong to the protection scope of the present invention.

Claims

1. A delivery guide wire, characterized in that, It includes a guide wire body and a loading member. The loading member is arranged on the guide wire body, and the loading member is used for loading a stent; a friction material is arranged on the outer surface of the loading member, and the friction material is used to contact the stent loaded on the loading member to increase the frictional force between the loading member and the stent.

2. The delivery guide wire according to claim 1, wherein A recess is arranged on the outer surface of the loading member, and the friction material is placed in at least part of the recess.

3. The delivery guide wire according to claim 2, wherein, The recess is a spiral groove arranged to rotate along the axial direction of the loading member itself.

4. The delivery guide wire according to claim 3, characterized in that, The friction material fills at least part of the area of the spiral groove, or after the friction material fills at least part of the area of the spiral groove, it further covers at least part of the outer surface of the loading member and / or the guide wire body.

5. The delivery guide wire according to claim 3, characterized in that, The maximum depth of the spiral groove in the radial direction of the loading member is less than the wire diameter of the stent loaded on the loading member.

6. The delivery guide wire according to claim 3, wherein The guide wire body includes a proximal region, the loading member, and a distal region that are sequentially connected along the axial direction from the proximal end to the distal end; the outer surface of the loading member is arranged as a spiral blade, and the spiral blade encloses to form the spiral groove.

7. The delivery guide wire according to claim 6, wherein, The spiral blade is sequentially connected by a plurality of rotating segments arranged at intervals along the axial direction of the spiral blade itself; at least part of the outer peripheral surface of the rotating segment is used to connect the friction material to increase the outer diameter of the rotating segment, so that the outer diameters of all the rotating segments are the same.

8. The delivery guide wire according to claim 6, wherein The rotating segment includes a first rotating piece and a second rotating piece, and the outer diameter of the first rotating piece is greater than the outer diameter of the second rotating piece; all the first rotating pieces and all the second rotating pieces are alternately arranged in sequence in the axial direction of the spiral blade.

9. The delivery guide wire according to claim 8, wherein In the direction from the proximal end to the distal end along the axis of the spiral blade, all the rotating segments are arranged in sequence according to the size of the outer diameter, so that the outer diameters of all the rotating segments gradually decrease or gradually increase.

10. The delivery guide wire according to claim 3, characterized in that, The outer contour of the loading member is frustum-shaped, the outer diameter of the proximal end of the loading member is greater than the outer diameter of the distal end of the loading member, or the outer contour of the loading member is cylindrical.

11. The delivery guide wire according to claim 10, wherein, In the direction from the proximal end to the distal end along the axial direction of the loading member, the width of the spiral groove gradually increases, and the depth of the spiral groove in the radial direction of the loading member gradually increases.

12. The delivery guide wire according to claim 1, characterized in that, The loading member is an elastic member and can elongate or contract in its own axial direction; the loading member is sleeved on the outer surface of the guide wire body; the loading member is used to contract and separate from the stent after the stent is released.

13. The delivery guide wire according to claim 12, characterized in that, It further includes a control wire. The proximal end of the loading member is connected to the guide wire body, and the distal end of the loading member is separated from the guide wire body; the control wire is connected to the distal end of the loading member, and the control wire is used to drive the distal end of the loading member to move towards the proximal end of the loading member after the stent is released, so that the stent contracts.

14. The delivery guide wire according to any one of claims 1-13, characterized in that, After the stent is pressed and held on the loading member, the shape of the loading member matches the shape of the guide wire body.

15. The delivery guide wire according to any one of claims 1-13, characterized in that, After the stent is crimped on the loading member, the proximal end of the stent is radially aligned with the proximal end of the loading member. The length of the loading member in its own axial direction is greater than 2 mm, and the length of the loading member in its own axial direction is less than two-thirds of the length of the stent in the axial direction of the loading member.

16. The delivery guide wire according to any one of claims 1-13, characterized in that, The friction material is a polymer material.

17. A conveying system, characterized in that, It includes a stent and a delivery guide wire as described in any one of claims 1-16. The stent is crimped on the loading member, and the delivery guide wire is used to drive the stent to move through the loading member.

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