Preparation method of intravenous stent and core rod

Abstract

The embodiment of the invention provides a preparation method of a venous stent and a core rod, and the preparation method of the venous stent comprises the following steps: forming a cutting part and a weaving part, and the weaving part is provided with a to-be-woven end; providing a first core rod, wherein the first core rod is provided with a first main body part and a second main body part; fixing the cutting part on the first main body part; fixing the weaving part on the second main body part; and connecting the end to be woven with the cutting part. By adopting the technical scheme, the cutting part is fixed on the first main body part of the first core rod, the weaving part is fixed on the second main body part of the first core rod, and then the end to be woven is connected with the cutting part, which means that the part, fixed on the second main body part, of the weaving part is formed before the end to be woven is connected with the cutting part; in this way, the parts, fixed to the second main body part, of the cutting part and the weaving part can be prepared at the same time, and therefore the preparation efficiency of the venous stent can be improved.

Description

Technical Field

[0001] The disclosed embodiments relate to the field of medical device technology, and in particular to a method for preparing a venous stent and a core rod. Background Art

[0002] The iliac vein is an important blood vessel for blood to flow back to the heart from the lower limbs and pelvis. Due to its specific anatomical structure, it is easily compressed, which can lead to blood flow obstruction and other complications. As the compressed part of the iliac vein, the iliac pressure segment vein is at risk of local lumen stenosis and requires interventional surgery.

[0003] In interventional surgery, a venous stent can be used to support the iliac vein to alleviate the risk of local lumen stenosis of the iliac vein. The preparation efficiency of existing venous stents is low, so how to improve the preparation efficiency of venous stents has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of this, the embodiments of the present disclosure provide a method for preparing a venous stent and a core rod, which can improve the preparation efficiency of the venous stent.

[0005] The present disclosure provides a method for preparing a venous stent, comprising the following steps:

[0006] forming a cutting portion and a braiding portion, wherein the braiding portion has an end to be braided;

[0007] providing a first mandrel having a first body portion and a second body portion;

[0008] Fixing the cutting portion to the first main body portion; fixing the braided portion to the second main body portion;

[0009] The end to be braided is connected to the cutting portion.

[0010] Optionally, fixing the cutting portion to the first main body portion includes:

[0011] The cutting part is sleeved on and bonded to the first main body part.

[0012] Optionally, the side of the first main body has an adjustment hole; after the cutting part is fixed to the first main body, the preparation method further includes:

[0013] One end of the adjusting member is passed through the cutting portion and inserted into the adjusting hole, and the cutting portion is squeezed by moving the other end of the adjusting member.

[0014] Optionally, fixing the braided portion to the second main body portion comprises:

[0015] The braided portion is sleeved on and bonded to the second main body portion.

[0016] Optionally, connecting the end to be braided with the cutting portion comprises:

[0017] After the braiding wire of the end to be braided is passed through the cutting part, a closed end is formed on the second main body part.

[0018] Optionally, a first winding member is provided on a side of the second main body; and the step of passing the braided wire of the end to be braided through the cutting portion to form a closed end on the second main body comprises:

[0019] After the braiding wire at the end to be braided is passed through the cutting portion, it is first folded back toward the direction of the first winding piece; based on the first winding piece, it is further folded back toward the direction of the first main body; and the wire head of the braiding wire is welded to the braiding portion between the first main body and the first winding piece.

[0020] Optionally, the side surface of the second main body has a plurality of rectangular marking areas distributed in an array; the step of connecting the end to be woven with the cutting portion comprises:

[0021] After the braiding wire to be braided is passed through the hollow area of ​​the cutting portion, the corresponding first winding piece is selected to be folded back along the diagonal direction of the rectangular marking area; based on the first winding piece, it is folded back along the other diagonal direction of the rectangular marking area; the wire head of the braiding wire is welded to the braided portion between the first main body and the first winding piece.

[0022] Optionally, forming the braided portion comprises:

[0023] Providing a braiding machine and a second mandrel, and assembling the second mandrel on the braiding machine;

[0024] Providing a braiding wire, connecting two ends of the braiding wire to the spindle of the braiding machine respectively, and winding a middle point on the second winding piece of the second mandrel;

[0025] The braiding machine is started to perform braiding to form a braided portion.

[0026] Accordingly, the embodiment of the present disclosure further provides a mandrel, which is applied to the method for preparing the venous stent described in any of the above embodiments, and the mandrel comprises:

[0027] A first main body portion, wherein a side surface of the first main body portion has a first adhesive layer;

[0028] The second main body has a second adhesive layer and a first winding member on its side.

[0029] Optionally, the side surface of the first main body further has an adjustment hole.

[0030] Optionally, the side surface of the second main body further has a rectangular identification area.

[0031] Compared with the prior art, the technical solution of the embodiment of the present disclosure has the following advantages:

[0032] In the solution provided by the embodiment of the present disclosure, the cutting part is first fixed to the first main body part of the first core rod, and the braiding part is fixed to the second main body part of the first core rod, and then the end to be braided is connected to the cutting part. This means that the part of the braiding part fixed to the second main body part is formed before the end to be braided is connected to the cutting part. In this way, the preparation of the cutting part and the part of the braiding part fixed to the second main body part can be carried out at the same time, thereby improving the preparation efficiency of the venous stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the drawings required for use in the embodiments of this specification or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A flowchart showing the steps of a method for preparing a venous stent in an embodiment of the present disclosure is shown;

[0035] Figure 2 A schematic structural diagram of a cutting portion in an embodiment of the present disclosure is shown;

[0036] Figure 3 A schematic structural diagram of a braided portion in an embodiment of the present disclosure is shown;

[0037] Figure 4 A schematic structural diagram of a first core rod in an embodiment of the present disclosure is shown;

[0038] Figure 5 A schematic structural diagram of a second mandrel in an embodiment of the present disclosure is shown;

[0039] Figure 6 A flowchart showing the specific steps of a method for preparing a venous stent in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0040] As described in the background art, an iliac vein stent may be used to support the iliac vein in the iliac segment during interventional surgery to alleviate the risk of local lumen stenosis of the iliac vein.

[0041] As an example, the venous stent includes: a cutting part and a braiding part, wherein the cutting part is a hollow area formed by a plurality of cutting rods; the braiding part is a mesh structure formed by braiding wires, and one end of the braiding part is connected to one end of the cutting part.

[0042] As an example, the preparation steps of the venous stent include: first, forming a cutting portion by laser cutting the material; then, sleeve the cutting portion on a braiding core rod (referred to as core rod) installed on a braiding machine; then, connect one end of the braiding wire to the spindle on the braiding machine, and the other end is passed through the cutting portion and also connected to the spindle; then, start the braiding machine to weave to form the braided portion.

[0043] According to the above preparation method, it can be known that the formation process of the braided portion requires the cooperation of the cutting portion, which means that the braided portion is formed after the cutting portion, resulting in a low preparation efficiency of the venous stent.

[0044] Therefore, how to provide a method for preparing a venous stent that can improve the preparation efficiency of the venous stent has become a technical problem that needs to be urgently solved by those skilled in the art.

[0045] In order to solve the above technical problems, an embodiment of the present disclosure provides a method for preparing a venous stent, which comprises the following steps: forming a braiding portion and a cutting portion, wherein the braiding portion has an end to be braided; providing a first core rod, wherein the first core rod has a first main body portion and a second main body portion; fixing the cutting portion to the first main body portion, and fixing the braiding portion to the second main body portion; connecting the end to be braided with the cutting portion.

[0046] In the preparation method of the venous stent provided in the embodiment of the present disclosure, the cutting part is first fixed to the first main body part of the first core rod, and the braiding part is fixed to the second main body part of the first core rod, and then the end to be braided is connected to the cutting part. This means that the part of the braided part fixed to the second main body part is formed before the end to be braided is connected to the cutting part. In this way, the preparation of the cutting part and the part of the braided part fixed to the second main body part can be carried out at the same time, thereby improving the preparation efficiency of the venous stent.

[0047] In order to enable those skilled in the art to better understand and implement the embodiments of the present disclosure, the concepts, schemes, principles and advantages of the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings and through examples.

[0048] Combined with reference Figures 1 to 4 ,in, Figure 1 A flowchart showing the steps of a method for preparing a venous stent in an embodiment of the present disclosure is shown. Figure 2 A schematic diagram of the structure of a cutting part in an embodiment of the present disclosure is shown. Figure 3 A schematic diagram of the structure of a braided portion in an embodiment of the present disclosure is shown. Figure 4 A schematic structural diagram of a first core rod in an embodiment of the present disclosure is shown.

[0049] In this embodiment, the venous stent can be prepared by the following steps:

[0050] Step A, forming a cutting portion.

[0051] In some examples, the cutting portion 10 may be a tubular structure with a side wall having a hollow area a. Compared with the braided portion 20, the cutting portion 10 has a higher supporting force and can better support the vein.

[0052] In some examples, there are multiple hollow areas a on the side wall of the cutting portion 10 .

[0053] In some examples, the material of the cutting portion 10 may be a shape memory material, for example, may be composed of one or more materials selected from nickel-titanium alloy, spring steel, shape memory polymer, and the like.

[0054] Step B, forming the braided portion.

[0055] In some examples, the braided portion 20 may be a tubular structure with meshed sidewalls formed by braiding wires 21. Compared to the cutting portion 10, the braided portion 20 has higher flexibility and can better match the physiological and anatomical characteristics of different sections of various veins.

[0056] In some examples, the number of mesh holes on the side wall of the woven portion 20 is multiple.

[0057] In some examples, the provided braided portion 20 is a tubular structure that has completed the main body braiding but also has an end 20a to be braided, wherein the end 20a to be braided can be an end that has not been closed and has a wire head 21a of the braiding wire 21 to be continued to be braided and completed with the closing treatment.

[0058] In some examples, the provided woven portion 20 may have one end as the end to be woven 20a and the other end as a closed end, wherein the closed end is the end of the woven portion 20 that has been closed.

[0059] Step C, providing a first core rod.

[0060] In some examples, the first core rod 30 may be a rod-shaped structure, and the first core rod 30 has a first main body portion 31 and a second main body portion 32 , and the first main body portion 31 and the second main body portion 32 are distributed along the axial direction of the first core rod 30 .

[0061] In some examples, the outer diameter of the first body portion 31 matches the inner diameter of the cutting portion 10 .

[0062] In some examples, an outer diameter of the second body portion 32 matches an inner diameter of the braided portion 20 .

[0063] Step D: fix the cutting part to the first main body of the first mandrel, so that the relative position of the cutting part 10 and the first mandrel 30 remains unchanged, which facilitates the subsequent connection between the cutting part 10 and the end 20a of the braided part 20.

[0064] Step E: fix the braided portion to the second main body of the first mandrel, so that the relative position of the braided portion 20 and the first mandrel 30 remains unchanged, which facilitates the subsequent connection between the end 20a of the braided portion 20 to be braided and the cutting portion 10.

[0065] Step F, connecting the end to be woven of the woven portion to the cutting portion.

[0066] It can be seen that the above preparation method decomposes the preparation process of the cutting part 10 and the weaving part 20 into independent steps, so that the preparation of the cutting part 10 and the weaving part 20 can be carried out simultaneously, and then the end to be woven 20a is connected to the cutting part 10 to complete the preparation of the final venous stent, thereby improving the preparation efficiency of the venous stent.

[0067] In order to enable those skilled in the art to better understand and implement, the preparation method of the aforementioned venous stent is described in detail below through specific examples.

[0068] In some examples, the fixing method of the cutting portion 10 and the first main body portion 31 includes at least one of the following detachable methods: bonding, plugging, etc.

[0069] In some examples, step D may include: sleeve the cutting portion and bond it to the first main body, so as to limit the movement of the cutting portion relative to the first main body, so that the cutting portion is fixed to the first main body.

[0070] In some examples, the surface of the first body portion 31 may have a first adhesive layer (not shown in the figure) to adhere and fix the cutting portion 10 .

[0071] In a specific implementation, the formation time of the first adhesive layer can be selected according to specific circumstances. For example, in some examples, the first adhesive layer can be formed after the cutting part 10 is sleeved on the first main body 31. For another example, in other examples, the first adhesive layer can also be formed before the cutting part 10 is sleeved on the first main body 31. In this embodiment, the former is selected, which can reduce the difficulty of sleeved the cutting part 10 on the first main body 31.

[0072] In some examples, the material of the first adhesive layer may include one or more medical hot melt materials such as vinyl hot melt adhesive, acrylic hot melt adhesive, etc. In this way, when the venous stent is prepared, the first adhesive layer can be melted by heating, so that the venous stent can be separated from the first core rod.

[0073] In some examples, the first main body portion 31 may be a rod-shaped structure having a limiter (not shown) on the side, and the limiter is adapted to at least one of the hollow areas a of the cutting portion 10 .

[0074] In some examples, step D may include: sleeve the cutting part on the first main body, and allow the stopper to pass through the hollow area of ​​the cutting part. When the cutting part 10 is sleeved on the first main body 31, by adjusting the relative position of the cutting part 10 and the first main body 31, the stopper can pass through the corresponding hollow area a, so that the movement of the cutting part 10 relative to the first main body 31 can be limited, thereby fixing the cutting part 10 to the first main body 31.

[0075] In some examples, there may be a plurality of the limiting members, and the plurality of limiting members are distributed in a circumferential array along the first main body portion 31 .

[0076] In some examples, the limiting member may be disposed on the first main body 31 in at least one of welding, bonding, integral molding, screw connection, clamping, plug connection, etc. In this embodiment, the limiting member is a protrusion integrally molded with the first main body.

[0077] In some examples, after performing step D, the preparation method may further include the following steps: adjusting the shape of the cutting portion, so as to reduce the error and make the adjusted cutting portion 10 more in line with the initial design requirements.

[0078] In some examples, the side surface of the first main body portion 31 may have an adjustment hole b, wherein when the cutting portion 10 is sleeved on the first main body portion 31 , the adjustment hole b is exposed to the hollow area a of the cutting portion 10 .

[0079] In some examples, the adjustment hole b is used in conjunction with an adjustment piece. Specifically, when the cutting portion 10 is sleeved on the first main body portion 31, one end of the adjustment piece is passed through the hollow area a and inserted into the adjustment hole b. The other end of the adjustment piece is moved to squeeze the side wall of the hollow area a to adjust the shape of the cutting portion 10.

[0080] In some examples, the number of the adjustment holes b may be multiple, and the multiple adjustment holes b are distributed in an array on the side of the first main body, and there is at least one adjustment hole b exposed to the hollow area a of the cutting portion 10.

[0081] In some examples, the adjusting member may be a needle-shaped structure.

[0082] In some examples, step E may include: sleeve the braided portion and bond it to the second main body portion, so as to limit the movement of the braided portion 20 relative to the second main body portion 32 , so that the braided portion 20 is fixed to the second main body portion 32 .

[0083] In some examples, the surface of the second main body portion 32 may have a second adhesive layer (not shown in the figures) to adhesively fix the woven portion 20 .

[0084] In a specific implementation, the formation time of the second adhesive layer can be selected according to specific circumstances. For example, in some examples, the second adhesive layer can be formed after the braided portion 20 is sleeved on the second main body portion 32. For another example, in other examples, the second adhesive layer can also be formed before the braided portion 20 is sleeved on the second main body portion 32. In this embodiment, the former is selected, which can reduce the difficulty of sleeved the braided portion 20 on the second main body portion 32.

[0085] In some examples, the material of the second adhesive layer may include one or more medical hot melt materials such as vinyl hot melt adhesive, acrylic hot melt adhesive, etc. In this way, when the venous stent is prepared, the second adhesive layer can be melted by heating, so that the venous stent can be separated from the first core rod.

[0086] In some examples, step F may include: after the wire head of the braiding wire at the end to be braided passes through the hollow area of ​​the cutting portion, a closed end is formed on the second main body portion to connect the braiding portion and the cutting portion.

[0087] In some examples, the end 20 a of the braided portion 20 is close to the cutting portion 10 , which facilitates the subsequent connection between the end 20 a and the cutting portion 10 .

[0088] In some examples, a first winding member 32 a is disposed on a side surface of the second main body portion 32 .

[0089] In some examples, the braiding wire at the end to be braided passes through the hollow area of ​​the cutting part to form a closed end at the second main body, which may include: after the braiding wire at the end to be braided passes through the hollow area of ​​the cutting part, it is first folded back in the direction of the first winding piece, and based on the first winding piece, it continues to fold back in the direction of the first main body, and the wire head of the braiding wire is fixed on the braided part between the first main body and the first winding piece to form a closed end at the second main body.

[0090] In some examples, the wire head 21a of the braided wire 21 and the braided portion 20 may be fixed by welding.

[0091] In some examples, the side of the second main body 32 may have a first loop hole (not shown in the figure), and the first loop member 32a is detachably connected to the second main body 32 through the first loop hole. When in use, after the braided portion 20 is sleeved on the second main body 32, one end of the first loop member 32a can be passed through the mesh of the braided portion 20 and fixed in the first loop hole; after the subsequent braiding is completed, the first loop member 32a is removed, and then the venous stent is detached from the first core rod 30. By setting the first loop member 32a to be detachably connected to the second main body 32, the difficulty of sleeve-on and detach-off of the braided portion 20 can be reduced, and the deformation of the braided portion 20 caused by the first loop member 32a during the sleeve-on and detach-off process can be reduced.

[0092] In some examples, the first winding member 32a may be arranged on the second main body 32 in at least one of detachable connection modes such as plug-in connection, screw connection, and clamp connection. In this embodiment, the first winding member 32a is plug-fitted with the first winding hole.

[0093] In some examples, the number of the first loop holes may be multiple, and the multiple first loop holes are distributed on the side surface of the second main body portion 32 along a circumferential array of the second main body portion 32 .

[0094] In some examples, there may be a plurality of first winding members 32 a , and the plurality of first winding members 32 a are distributed along the circumference of the second main body portion.

[0095] In some examples, the number of the first winding members 32 a corresponds to the number of connection positions between the cutting portion 10 and the braided portion 20 .

[0096] In some examples, the axial angle between the first winding member 32a and the first mandrel 30 may be less than or equal to 90 degrees, for example, 30 degrees, so as to reduce the probability of the braided wire 21 detaching from the first winding member 32a during the winding process.

[0097] In some examples, the side surface of the second main body portion 32 also has a plurality of identification areas C distributed in an array, which are used to provide positioning for the weaving of the braided wire 21 after passing through the hollow area a of the cutting portion 10 and forming a closed end.

[0098] In some examples, the side surface of the second main body portion 32 has a plurality of axial markings 32b extending along the axial direction of the second main body portion 32, and a plurality of circumferential markings 32c extending along the circumferential direction of the second main body portion 32. The axial markings 32b and the circumferential markings 32c intersect vertically to form a plurality of rectangular marking areas C distributed in an array on the side surface of the second main body portion 32.

[0099] In some examples, the braiding wire 21 of the end 20a to be braided forms a closed end on the second main body 32 after passing through the hollow area a of the cutting portion 10. It may include: after the braiding wire 21 of the end 20a to be braided passes through the hollow area a of the cutting portion 10, first select the corresponding first winding piece 32a to fold back along the diagonal direction of the rectangular marking area C, and fold back along the other diagonal direction of the rectangular marking area C based on the first winding piece 32a, and fix the wire head 21a of the braiding wire 21 on the braided portion 20 between the first main body 31 and the first winding piece 32a to form a closed end in the second main body 32.

[0100] In some examples, the axial mark 32b may include at least one of a groove and a marking line.

[0101] In some examples, the circumferential mark 32c may include at least one of a groove and a marking line.

[0102] In some examples, the first core rod 30 may further include a connecting portion 33 , and the connecting portion 33 is located between the first main body portion 31 and the second main body portion 32 .

[0103] In some examples, at least a part of the hollow area a of the end of the cutting portion 10 close to the second main body 32 is opposite to the connecting portion 33, and the outer diameter of the connecting portion 33 is smaller than the outer diameter of the first main body 31, which means that there is a gap between the hollow area a and the connecting portion 33 along the radial direction of the connecting portion 33. In this way, when the braiding wire of the end 20a to be braided passes through the hollow area a, the connecting portion 33 can provide a retreat space for the subsequent connection between the end 20a to be braided and the cutting portion 10, thereby reducing the difficulty of connecting the end 20a to be braided and the cutting portion 10, and at the same time, it can also improve the protrusion problem caused by the overlap of the braiding wire 21 at the connection position.

[0104] In some examples, the end to be braided 20a is opposite to the connecting portion 33, and the outer diameter of the connecting portion 33 is smaller than the outer diameter of the second main body portion 32, which means that there is a gap between the end to be braided 20a and the connecting portion 33 along the radial direction of the connecting portion 33. This can further reduce the difficulty of connecting the end to be braided 20a to the cutting portion 10 later.

[0105] In some examples, the second main body 32 may include at least one sub-body. When there are multiple sub-body, the multiple sub-body can be sequentially detachably connected along the axial direction of the first mandrel 30. By combining different numbers of sub-body, braided parts 20 of different lengths can be adapted, thereby increasing the adaptability of the first mandrel 30.

[0106] In some examples, the connection between adjacent sub-body parts may include at least one of detachable connection modes such as plug-in connection, screw connection, and snap connection. In this embodiment, the adjacent sub-body parts are plug-in-matched.

[0107] Combined with reference Figures 1 to 5 ,in, Figure 5 A schematic structural diagram of a second core rod in an embodiment of the present disclosure is shown.

[0108] In some examples, before executing step A, the method for preparing the venous stent may further include the following steps: forming a cutting portion 10 .

[0109] In some examples, the cutting portion 10 may be formed by a laser cutting process. Compared with a weaving process, the cutting portion formed by a laser cutting process has a higher supporting force.

[0110] In some examples, before executing step B, the method for preparing the venous stent may further include the following steps: forming a braided portion 20, wherein the braided portion 20 has a to-be-braided end 20a.

[0111] In some examples, the braided portion 20 may be formed by braiding wires 21 through a braiding process. Compared with a laser cutting process, the braided portion 20 formed by a braiding process has higher flexibility.

[0112] In some examples, the forming of the braided portion 20 may include: providing a braiding machine; wherein the braiding machine has a plurality of spindles, and the plurality of spindles are arranged in a circumferential array; providing a second core rod 40; a plurality of second winding members 40a are provided on the second core rod 40; assembling the second core rod 40 on the braiding machine; providing a braiding wire 21, connecting the two ends of the braiding wire 21 to the spindles respectively, and winding the midpoint around the second winding member 40a; starting the braiding machine for braiding to form the braided portion 20; wherein the formed braided portion 20 has an end 20a to be braided.

[0113] Through the above steps, the braiding part 20 can independently complete the main body braiding, and subsequently only needs to complete the connection with the cutting part 10 to realize the preparation of the venous stent.

[0114] In some examples, the axial angle between the second winding member 40a and the second mandrel 40 may be less than or equal to 90 degrees, for example, 30 degrees, so as to reduce the probability of the braiding wire 21 detaching from the second winding member 40a during the braiding process.

[0115] In some examples, there are multiple second winding members 40a, and the multiple second winding members 40a are evenly distributed along the circumference of the second mandrel 40. In this way, the uniformity of the formed braided portion 20 in the circumferential direction can be increased.

[0116] In some examples, the side of the second mandrel 40a has a second winding hole (not shown in the figure), and the second winding piece 40a is detachably connected to the second mandrel 40 through the second winding hole. This can reduce the difficulty of the braided portion 20 being separated from the second mandrel 40, and reduce the deformation of the braided portion 20 caused by the second winding piece 40a during the separation process.

[0117] In some examples, the second winding member 40a may be arranged on the second mandrel 40 in at least one of detachable connection modes such as plug-in connection, screw connection, and clamp connection. In this embodiment, the second winding member 40a is plug-in-matched with the second winding hole.

[0118] In order to enable those skilled in the art to better understand and implement, the preparation method of the aforementioned venous stent is described in detail below through specific application examples and drawings.

[0119] As a specific application example, see Figure 6 , Figure 6 The specific steps of a method for preparing a venous stent in an embodiment of the present disclosure are shown in a flowchart. The method for preparing a venous stent comprises:

[0120] S1, forming a cutting portion through a laser cutting process.

[0121] S2, providing a braiding machine and a second mandrel, and assembling the second mandrel on the braiding machine.

[0122] S3, providing a braiding wire, connecting two ends of the braiding wire to the spindles of the braiding machine respectively, and winding a middle point of the braiding wire on the second winding piece of the second core rod.

[0123] S4, starting the braiding machine to perform braiding to form the braided portion.

[0124] S5, providing a first mandrel.

[0125] S6, sleeve the cutting part on the first main body of the first mandrel, and make the limiting member pass through the hollow area of ​​the cutting part, and make the hollow area of ​​the cutting part close to the second main body be located at the connecting part of the first mandrel.

[0126] S7, adjusting the shape of the cutting portion.

[0127] S8, sleeve the braided portion onto and bond it to the second main body of the first core rod, and locate the end of the braided portion to be braided at the connecting portion.

[0128] S9, after the braiding wire of the end to be braided is passed through the hollow area of ​​the cutting part, the braiding wire is first folded back in the direction of the first winding piece, and then continued to be folded back in the direction of the first main body part based on the first winding piece, and then the wire head of the braiding wire is welded to the braided part between the first main body part and the first winding piece to form a closed end.

[0129] It should be noted that S1 and S2-S4 are independent of each other, and the execution order of the two can be determined according to the specific situation. For example, in this embodiment, S1 and S2-S4 are executed at the same time. For another example, in other examples, S1 and S2-S4 may not be executed at the same time.

[0130] It should be noted that S6-S7 and S8 are independent of each other, and the execution order of the two can be determined according to the specific situation. For example, in this embodiment, S6-S7 can be executed first, and then S8. For another example, in other examples, S8 can also be executed first, and then S6-S7.

[0131] Accordingly, combined with reference Figure 4 The embodiment of the present disclosure also provides a mandrel for preparing a venous stent, the venous stent includes a cutting portion and a braiding portion, and the mandrel may include: a first main body portion 31 and a second main body portion 32, wherein the first main body portion 31 is used to fix the cutting portion, and the second main body portion 32 is used to fix the braiding portion. In this way, the relative position of the cutting portion and the braiding portion remains unchanged, which facilitates the connection between the braiding portion and the cutting portion.

[0132] In some examples, the surface of the first body portion 31 may have a first adhesive layer to adhere and fix the cutting portion.

[0133] In some examples, the material of the first adhesive layer may include one or more medical hot melt materials such as vinyl hot melt adhesive, acrylic hot melt adhesive, etc. In this way, when the venous stent is prepared, the first adhesive layer can be melted by heating, so that the venous stent can be separated from the core rod.

[0134] In some examples, the first main body 31 may be a rod-shaped structure having a limiter on the side, and the limiter is used to penetrate the hollow area of ​​the cutting portion to fix the cutting portion.

[0135] In some examples, there may be a plurality of the limiting members, and the plurality of limiting members are distributed in a circumferential array along the first main body portion 31 .

[0136] In some examples, the limiting member may be disposed on the first main body 31 in at least one of welding, bonding, integral molding, screw connection, clamping, plug connection, etc. In this embodiment, the limiting member is a protrusion integrally molded with the first main body.

[0137] In some examples, the side surface of the first main body portion 31 may have an adjustment hole b, and the adjustment hole b is used to cooperate with an adjustment member to adjust the shape of the cutting portion sleeved on the first main body portion 31 .

[0138] In some examples, the number of the adjustment holes b may be multiple, and the multiple adjustment holes b are distributed in an array on the side of the first main body 31 .

[0139] In some examples, the surface of the second body portion 32 may have a second adhesive layer to adhesively fix the woven portion.

[0140] In some examples, the material of the second adhesive layer may include one or more medical hot melt materials such as vinyl hot melt adhesive, acrylic hot melt adhesive, etc. In this way, when the venous stent is prepared, the second adhesive layer can be melted by heating, so that the venous stent can be separated from the core rod.

[0141] In some examples, a first winding member 32 a may be disposed on a side surface of the second main body portion 32 .

[0142] In some examples, the side surface of the second main body portion 32 may have a first loop hole, and the first loop member 32a is detachably connected to the second main body portion 32 through the first loop hole.

[0143] In some examples, the first winding member 32a may be arranged on the second main body 32 in at least one of detachable connection modes such as plug-in connection, screw connection, and clamp connection. In this embodiment, the first winding member 32a is plug-fitted with the first winding hole.

[0144] In some examples, the number of the first loop holes may be multiple, and the multiple first loop hole arrays are distributed on the side of the second main body.

[0145] In some examples, there may be a plurality of first winding members 32 a , and the plurality of first winding members 32 a are distributed along the circumference of the second main body portion 32 .

[0146] In some examples, the number of the first winding members 32 a corresponds to the number of connection positions between the cutting portion and the braided portion.

[0147] In some examples, the axial angle between the first winding member 32a and the first mandrel 30 may be less than or equal to 90 degrees, for example, 30 degrees, so as to reduce the probability of the braided wire 21 detaching from the first winding member 32a during the winding process.

[0148] In some examples, the side surface of the second main body portion 32 also has an array-distributed identification area C for providing positioning for the weaving of the braided wire 21 after passing through the hollow area a of the cutting portion 10 and forming a closed end.

[0149] In some examples, the side surface of the second main body portion 32 has a plurality of axial markings 32b extending along the axial direction of the second main body portion 32, and a plurality of circumferential markings 32c extending along the circumferential direction of the second main body portion 32. The axial markings 32b and the circumferential markings 32c intersect vertically to form a rectangular marking area C distributed in an array on the side surface of the second main body portion 32.

[0150] In some examples, the axial mark 32b may include at least one of a groove and a marking line.

[0151] In some examples, the circumferential mark 32c may include at least one of a groove and a marking line.

[0152] In some examples, the core rod may further include a connecting portion 33, which is located between the first main body portion 31 and the second main body portion 32, and the outer diameter of the connecting portion 33 is smaller than the outer diameter of the first main body portion 31 and the outer diameter of the connecting portion 33 is smaller than the outer diameter of the second main body portion 32.

[0153] In this way, when the braided wire of the end to be braided passes through the hollow area, the connecting portion 33 can provide a retreat space for the connection between the end to be braided of the subsequent braided portion and the cutting portion, thereby reducing the difficulty of connecting the end to be braided of the subsequent braided portion and the cutting portion.

[0154] In some examples, the second main body 32 may include at least one sub-body. When there are multiple sub-body, the multiple sub-body can be sequentially detachably connected along the axial direction of the mandrel. By combining different numbers of sub-body, braided parts of different lengths can be adapted, thereby increasing the adaptability of the mandrel.

[0155] It can be understood that the above describes multiple embodiment schemes provided by the embodiments of the present disclosure, and the optional implementation methods and specific examples introduced in each embodiment scheme can be combined and cross-referenced with each other without conflict, thereby extending a variety of possible embodiment schemes, which can all be regarded as the embodiment schemes disclosed and disclosed by the present disclosure.

[0156] It should be noted that the “examples” or “embodiments” referred to in this specification refer to specific features, structures or characteristics that may be included in at least one implementation of the embodiments of the present disclosure. And in the description of this specification, the terms “first”, “second”, etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined by terms such as “first”, “second”, etc. may explicitly or implicitly include one or more of the features. Moreover, the terms such as “first”, “second”, etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or to express importance. It is understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein.

[0157] Although the embodiments of the present disclosure are disclosed as above, the present disclosure is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of this specification shall be subject to the scope defined by the claims.

Claims

1. A method for preparing a venous stent, characterized in that: The following steps are involved: forming a cutting portion and a braiding portion, wherein the braiding portion has an end to be braided; providing a first mandrel having a first body portion and a second body portion; Fixing the cutting portion to the first main body portion; fixing the braided portion to the second main body portion; The end to be braided is connected to the cutting portion.

2. The preparation method according to claim 1, characterized in that: The step of fixing the cutting portion to the first main body portion comprises: The cutting part is sleeved on and bonded to the first main body part.

3. The preparation method according to claim 1, characterized in that: The side surface of the first main body has an adjustment hole; after the cutting part is fixed to the first main body, the preparation method further includes: One end of the adjusting member is passed through the cutting portion and inserted into the adjusting hole, and the cutting portion is squeezed by moving the other end of the adjusting member.

4. The preparation method according to claim 1, characterized in that: The step of fixing the braided portion to the second main body portion comprises: The braided portion is sleeved on and bonded to the second main body portion.

5. The preparation method according to claim 1, characterized in that: The step of connecting the end to be braided with the cutting portion comprises: After the braiding wire of the end to be braided is passed through the cutting part, a closed end is formed on the second main body part.

6. The preparation method according to claim 5, characterized in that: A first winding member is provided on the side of the second main body; The method of passing the braided wire of the end to be braided through the cutting part to form a closed end on the second main body part comprises: After passing the braiding wire of the end to be braided through the cutting portion, it is first folded back in the direction of the first winding member; Based on the first winding member continuing to be folded back toward the first main body portion, the wire ends of the braiding wires are welded to the braided portion between the first main body portion and the first winding member.

7. The preparation method according to claim 1, characterized in that: The side surface of the second main body has a plurality of rectangular marking areas distributed in an array; the step of connecting the end to be woven with the cutting portion comprises: After the braiding wire to be braided is passed through the hollow area of ​​the cutting portion, the corresponding first winding piece is selected to be folded back along the diagonal direction of the rectangular marking area; based on the first winding piece, it is folded back along the other diagonal direction of the rectangular marking area; the wire head of the braiding wire is welded to the braiding portion between the first main body and the first winding piece.

8. The preparation method according to claim 1, characterized in that: The forming of the braided portion comprises: Providing a braiding machine and a second mandrel, and assembling the second mandrel on the braiding machine; Providing a braiding wire, connecting two ends of the braiding wire to the spindle of the braiding machine respectively, and winding a middle point on the second winding piece of the second mandrel; The braiding machine is started to perform braiding to form a braided portion.

9. A mandrel, characterized in that: The method for preparing the venous stent according to any one of claims 1 to 8, wherein the mandrel comprises: A first main body portion, wherein a side surface of the first main body portion has a first adhesive layer; The second main body has a second adhesive layer and a first winding member on its side.

10. The mandrel according to claim 9, characterized in that The side surface of the first main body also has an adjustment hole.

11. The mandrel according to claim 9, characterized in that The side surface of the second main body also has a rectangular marking area.

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