WO2020047878A1 - Segmentation-type esophageal stent and weaving method therefor - Google Patents

Abstract

A segmentation-type esophageal stent and a weaving method therefor. The esophageal stent is a cylindrical mesh stent that is formed by weaving a monofilament and has two ends in the shape of a bell mouth; the mesh stent consists of an upper bell mouth segment and a lower bell mouth segment; the upper bell mouth segment and the lower bell mouth segment are connected by means of several locking structures. Compared with an existing hook-type lock, a cruciform locking structure can enhance the supporting force of a whole esophageal stent and have good rigidity; the two ends of the esophageal stent both are in the shape of the bell mouth; by means of the design of the bell mouth, after the esophageal stent is inserted into an esophagus, the bell mouth in an upper part facilitates the pass of food, and the bell mouth in a lower part can prevent the stent from displacing and have a good function of fixing the stent, so that the stent is accurately fixed and positioned; the weaving process of the whole stent is completed by means one filament, so that the rigidity of the esophageal stent is improved, the axial compressional deformation of the esophageal stent can also be reduced, and the normal use of the esophageal stent is ensured.

Description

Segmented esophagus stent and weaving method thereof Technical field

The invention belongs to the field of medical equipment, and particularly relates to a segmented esophageal stent and a weaving method thereof.

Background technique

Esophageal stenosis or obstruction is a common complication of gastrointestinal diseases. The commonly used treatment method is to use domestic stents to treat esophageal stenosis and obstruction. The specific method is to place a biodegradable stent in the lesion. It is short-term formed in the esophagus and has good The biocompatibility is completely dissolved subsequently, and the degradation time of the stent can be adjusted according to clinical needs, avoiding the complications of the permanent stent. There are various shapes and weaving methods of esophageal stents. Currently, segmented stents are commonly used. The segmented parts of segmented stents are connected by interlocking locks. The overall stent is braided with multiple wires, causing the stent to be in the shaft. Easy to shrink, poor overall rigidity, further reducing the fixing force of the openings at both ends, and at the same time, the stent will contract inward in the middle, resulting in a smaller inner diameter of the stent, which is not conducive to food passage. Long-term use may even shorten the life of the esophageal stent .

Summary of the Invention

The purpose of the present invention is to solve the problems that the existing esophageal stent is easily shortened in the axial direction and has poor overall rigidity, which is caused by braiding multiple threads.

To this end, the present invention provides a segmented esophageal stent, which is a cylindrical mesh stent with a bell mouth at both ends woven from a single wire. The mesh brace is composed of an upper bell mouth section and a lower bell mouth. The two sections are composed of two sections. The upper flared section and the lower flared section are connected by a plurality of locking structures.

Further, the lock structure is a cross-shaped structure formed by overlapping and crossing the monofilament at the junction of the end of the upper bell mouth section and the end of the lower bell mouth section.

Further, at least three locking structures are provided between the upper bell mouth section and the lower bell mouth section.

Further, the angle of the bell mouth is 40-50 °.

Further, a method for weaving a segmented esophageal stent includes the following steps:

Step 1: punch a blind hole in the middle of the esophageal braiding tooling and insert a screw into the blind hole;

Step 2: Fix one end of the monofilament to the head of either end of the esophageal braiding jig, and the other end of the monofilament to be overlapped and intertwined on the esophageal braid jig to form a meshed upper and lower bell mouth section. The wire is overlapped and wound at the screw rod to form a cross-shaped locking structure;

Step three, according to the knitting method of step two, weaving at least three lock structures;

Step 4. After the braiding is completed, heat-set the two ports of the segmented esophageal stent to form a bell mouth with a flare of 40-50 °, and complete the braiding of the segmented esophageal stent.

Further, the esophagus braiding tooling includes a cylindrical hollow metal tube, and also includes a screw, a short joint, a square tube, and a spring. The short joint, the square tube, and the spring are sleeved on the screw in order from top to bottom, and the screw passes through the hollow metal. There is a limit structure in the hollow metal tube. One end of the spring is limited by the limit structure and the other end bears on the end face of the square tube. The outer diameter of the short joint is the same as the outer diameter of the hollow metal tube. The inner cavity of the hollow metal tube is Square channel, the square tube fits into the square channel of the hollow metal tube, the short joint and the square tube are fixedly connected or integrally formed and can slide along the screw;

On the outer wall of the hollow metal pipe and the short joint, several edges are evenly spaced circumferentially, and the ribs on the hollow metal pipe correspond to the ribs on the short joint one to one.

Further, the short joint, the square tube and the spring are all one, and two ends of the screw are respectively screwed with a nut;

The limiting structure is a circular hole opened at one end of the hollow metal pipe, the diameter of the circular hole is smaller than the diameter of the spring, and a square hole is opened at the other end of the hollow metal pipe. The square pipe is inserted into the hollow metal pipe through the square hole.

Further, from the two ends to the middle point of the screw, a short joint, a square tube and a spring are threaded in order, and a nut is screwed on each end of the screw;

The inner cavity of the hollow metal tube is divided into three sections, the upper and lower sections are square channels, the middle section is a cylindrical channel, the diameter of the cylindrical channel is smaller than the diameter of the square channel, and the connection between the cylindrical channel and the square channel forms a step. The tubes are respectively inserted in the corresponding square channels. One end of the two springs abuts the corresponding step, and the other end abuts the end surface of the corresponding square tube. The two steps are the limiting structures of the two springs.

Further, when the short joint and the square pipe slide up and down along the screw, the spring is in a natural or compressed state. When the spring is in a natural state, the distance between the lower end of the short joint and the upper end of the hollow metal pipe is 2 to 5 mm.

Further, a blind hole is provided on the outer wall of the middle portion of the hollow metal pipe. The distance between the two adjacent blind holes is equal, and the distance between the two adjacent blind holes in each circle is the same. Screw rods; the number of ribs on the outer wall of the hollow metal tube and the short joint is the same as the number of heads of the wire at the end of the stent to be woven.

Beneficial effects of the present invention: The segmented esophageal stent and weaving method provided by the present invention adopts monofilament weaving to form a segmented esophageal stent, which overlaps and crosses each other to form a mesh-shaped stent when weaving, especially segmentation. The cross-shaped lock structure is adopted between the parts. Compared with the existing hook-type lock, the cross-shaped lock structure of the present invention can enhance the support force of the entire esophageal stent and has better rigidity; The ends are trumpet-shaped. The design of the trumpet allows the esophageal stent to enter the esophagus, and the upper flared mouth facilitates the passage of food. The lower flared mouth prevents the stent from shifting and plays a good role in fixing the stent to make it accurate. Retention; the whole braiding process of the stent is completed by only one silk thread, which not only improves the rigidity of the esophageal stent, but also reduces the axial compression deformation of the esophageal stent to ensure the normal use of the esophageal stent.

The present invention will be further described in detail below with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a segmented esophageal stent.

2 to 9 are schematic diagrams of a knitting step in the fourth embodiment.

Fig. 10 is a perspective view of an esophageal braiding jig.

Fig. 11 is a front view of an esophageal braiding jig.

FIG. 12 is a cross-sectional view of an esophageal stent braiding tool with a spring in the center metal tube.

13 is a cross-sectional view of an esophageal stent braiding tool with two springs in a center metal tube.

FIG. 14 is a schematic diagram of a central metal pipe with blind holes.

Reference sign description:

1. Hollow metal tube; 101. Blind hole;

201. screw; 202. nut; 203. short joint; 204. square tube; 205. spring.

detailed description

Example 1:

As shown in FIG. 1, this embodiment provides a segmented esophageal stent, which is a cylindrical mesh stent with a bell mouth at both ends woven from a single wire. The mouth section and the lower bell mouth section are composed of two sections, and the upper bell mouth section and the lower bell mouth section are connected by a plurality of locking structures.

The segmented esophageal stent of this embodiment is composed of an upper flared section and a lower flared section, that is, both ends of the esophageal stent are flared, and the design of the flared stent can make the esophageal stent fall into the esophagus The upper bell mouth is conducive to the passage of food, the lower bell mouth can prevent the bracket from shifting, and it has a good fixing effect on the bracket, allowing it to be accurately held; the entire braiding process of the bracket is completed with only one silk thread, which improves both The rigidity of the esophageal stent can be reduced, and the axial compression deformation of the esophageal stent can be reduced, so as to ensure the normal use of the esophageal stent.

Example 2:

On the basis of Embodiment 1, compared with the existing hook-type lock, the lock structure in this embodiment is formed by overlapping and crossing the monofilament at the end of the upper bell mouth section and the lower bell mouth section. Cruciform structure.

The cross-shaped locking structure of the invention can enhance the supporting force of the entire esophageal stent and has better rigidity. The whole braiding process of the entire stent is completed by only one silk thread, which not only improves the rigidity of the esophageal stent, but also reduces the axial compression deformation of the esophageal stent to ensure the normal use of the esophageal stent.

Example 3:

Based on Embodiment 2, in order to ensure the stable shape of the entire esophageal stent and avoid deformation, at least three locking structures are provided between the upper flared section and the lower flared section. The angle of the bell mouth is 40 to 50 °. The design of the bell mouth can make the esophageal stent into the esophagus, the upper bell mouth is convenient for food to pass through, and the lower bell mouth can prevent the stent from shifting. Fixing effect makes it precise retention.

Example 4:

A method for weaving a segmented esophageal stent includes the following steps:

Step 1: punch a blind hole 101 in the middle of the esophageal braiding tooling and insert a screw into the blind hole 101;

Step 2: Fix one end of the monofilament to the head of either end of the esophageal braiding jig, and the other end of the monofilament to be overlapped and intertwined on the esophageal braid jig to form a meshed upper and lower bell mouth section. The wire is overlapped and wound at the screw rod to form a cross-shaped locking structure;

Step three, according to the knitting method of step two, weaving at least three lock structures;

Step 4. After the braiding is completed, heat-set the two ports of the segmented esophageal stent to form a bell mouth with a flare of 40-50 °, and complete the braiding of the segmented esophageal stent.

According to the weaving method of the segmented esophageal stent shown in Figs. 2-9, the specific steps are as follows:

Before describing the steps of the weaving method, it is necessary to specify that P1 ～ P12 and R1 ～ R12. The esophageal stent fixtures at these points are marked with blind holes, a total of 4 circles of blind holes, and each blind hole is inserted in There are screw rods. In order to clearly explain how the esophageal stent is knitted, in this embodiment, the positions of the blind holes (screw rods) of 4 circles are marked in Figures 2-9. The four screw rods in the figure are only used as Example description.

As shown in Figure 2, the end of a woven monofilament is fixed at A1, then starting from the starting point A1, passing D5 to P1, and then passing P1 through F6, E8, D10 to B1, and B1 through a2 to A3;

As shown in Figure 3, after connecting, the monofilament goes from A3 through F11 to G1, then G1 through p2 to G3 (circle is a screw in the figure), bypasses G3 to R4 (screw), and R4 goes through H6, I8 To L1, then from L1 to N5, N5 via J11 to I1, I1 via H3 to R5;

As shown in Figure 4, connected, the monofilament goes from R5 through h9 to K1, then from K1 through m4 to N7, N7 through m9 to J1, J1 through h4 to R7, R7 through h10 to J1, and J1 through k4 to N9. N9 via m11 to K1, K1 via h6 to R9, R9 via H11 to I1, I1 via j5 to N11, and N11 via M12 to L1;

As shown in Fig. 5, after connecting, L1 passes I6 to R10 (the screw is inserted here), bypasses R10 to P4 (the screw is inserted here), and passes from P4 to F8 to C1;

As shown in Figure 6, connect C1 through B3 to A5, A5 through d10 to F1, F1 through G3 to P5, and P5 through d12 to D1;

As shown in Figure 7, connected, D1 passes b4 to A7, A7 passes b9 to E1, E1 passes f4 to P7, P7 passes e12 to E1, E1 passes b6 to A9, A9 passes b11 to D1, and D1 passes f6 to P9. , P9 passes G11 to F1, F1 passes c7 to A11, A11 passes b12 to C1, C1 passes F6 to P10 (the screw is inserted here), bypasses P10 to R11 (the screw is inserted here), and R11 passes the r12 To H1;

As shown in Figure 8, connected, H1 via K8 to N1, N1 via h10 to R1, R1 via J8 to M1, M1 via n2 to N3, N3 via J9 to H1, and H1 via r2 to R3 (there is a wire inserted here) Rod), bypassing R3 to P11;

As shown in Figure 9, after connecting, P11 passes p12 to G1, and then G1 passes D8 to A1;

The braiding of the segmented esophageal stent is completed, and the finished product is shown in FIG. 1.

It should be particularly noted that the weaving method provided by the present invention uses only one silk thread from beginning to end.

Example 5:

This embodiment provides a braiding tool for esophageal stent, including a cylindrical hollow metal tube 1, as shown in FIG. 10 and FIG. 11 and FIG. 12, and further includes a screw 201, a short joint 203, a square tube 204, and a spring 205. The section 203, the square tube 204 and the spring 205 are sleeved on the screw 201 in order from top to bottom. The screw 201 passes through the hollow metal tube 1 and a limiting structure is provided in the hollow metal tube 1. The spring 205 One end is limited by a limiting structure, and the other end abuts against the end surface of the square tube 204. The outer diameter of the short joint 203 is the same as the outer diameter of the hollow metal tube 1. The inner cavity of the hollow metal tube 1 It is a square channel, and the square tube 204 fits and intersects in the square channel of the hollow metal tube 1. The short joint 203 and the square tube 204 are fixedly connected or integrally formed and can slide along the screw 201;

On the outer wall of the hollow metal pipe 1 and the short joint 203, several ribs are uniformly spaced circumferentially (as shown in FIG. 13), and the rib on the hollow metal pipe 1 and the rib on the short joint 203 One correspondence (as shown in Figure 13).

The working principle or engineering of the esophageal braiding tooling provided in this embodiment is as follows:

Braid the esophageal stent on the short wall 203 and the outer wall of the hollow metal tube 1. In the process of weaving, if there is a tension in the thread, the short bar 203 can be pressed. Because the short bar 203 is connected to the square tube 204 or integrally formed, the short bar 203 slides along the screw 201 with the square tube 204, and the spring 205 is compressed by the compression of the square tube 204, so that the length of the entire knitting tool can be adjusted. When adjusted to a suitable position, the fixed short section 203 is in this position. Continue knitting. After the knitting is completed, press the short joint 203 to the end until it is in close contact with the hollow metal tube 1. Since the length of the entire tool is shortened and shorter than the length of the esophagus, the esophagus can be easily removed from the tool at this time. Save time.

It should be particularly noted that the inner cavity of the hollow metal pipe 1 in this embodiment is a square channel, so that when the square pipe 204 is inserted into the hollow metal pipe 1, the edges on the outer wall of the hollow metal pipe 1 and the short joint 203 can correspond one-to-one. So that we can brace the esophagus.

The esophageal stent braiding tool provided in this embodiment can braid the esophagus stent on the outer wall of the short section and the hollow metal tube. A distance of 2 to 5 mm is reserved between the short section and the hollow metal tube, and the short section can be pressed according to the needs of knitting. , Adjust the distance between the short section and the hollow metal tube to ensure that the esophageal support is elastically supported during the weaving process. In addition, after the esophageal support is knitted, the short section can be pressed to the bottom until it is in close contact with the hollow metal tube. Remove the esophageal stent. Therefore, the esophageal stent braiding tool provided by the present invention improves the support force to the esophageal stent by adjusting the overall length, and avoids the problem of broken or broken wires. It is especially suitable for degradable esophageal stent, which guarantees the quality and efficiency of the esophageal stent. Has a high practical value.

Example 6:

Based on Embodiment 5, as shown in FIG. 11, the short joint 203, the square tube 204, and the spring 205 are all one, and two ends of the screw 201 are respectively screwed with a nut 202; the limiting structure is A circular hole is formed in one end of the hollow metal pipe 1, the diameter of the circular hole is smaller than the diameter of the spring 205, and a square hole is opened in the other end of the hollow metal pipe 1, and the square pipe 204 passes through The square hole is inserted in the hollow metal pipe 1.

This embodiment embodies the structure for adjusting the length of the esophageal stent. Specifically, as shown in FIG. 11, the screw 201 passes through the hollow metal tube 1, and a nut 202 is screwed on the top and bottom ends of the screw 201. The top nut 202 is used for fixing. The short joint 203 prevents it from rebounding after being pressed. The bottom nut 202 limits and positions the screw 202.

When in use, first tighten the nut 202 at the bottom, if you need to adjust the length of the tooling, press the short joint 203 until it moves down to a proper position, and then turn the top nut 202 until it is in close contact with the top of the short joint 203; the braid is braided After completion, press the short section 203 until it is in close contact with the hollow metal tube 1, and then turn the top nut 202 until it is in close contact with the top of the short section 203, and then remove the esophageal stent.

The esophageal stent braiding tool provided in this embodiment can braid the esophagus stent on the outer wall of the short section and the hollow metal tube. A distance of 2 to 5 mm is reserved between the short section and the hollow metal tube, and the short section can be pressed according to the needs of knitting , Adjust the distance between the short section and the hollow metal tube to ensure that the esophageal support is elastically supported during the weaving process. In addition, after the esophageal support is knitted, the short section can be pressed to the bottom until it is in close contact with the hollow metal tube. Remove the esophageal stent. Therefore, the esophageal stent braiding tool provided by the present invention improves the support force to the esophageal stent by adjusting the overall length, and avoids the problem of broken or broken wires. It is especially suitable for degradable esophageal stent, which guarantees the quality and efficiency of the esophageal stent. Has a high practical value.

Example 7:

Based on Embodiment 5, this embodiment provides a solution different from Embodiment 6. Specifically, as shown in FIG. 10 and FIG. 13, the screw 201 passes through the sleeve from its two ends to its midpoint in order. A short section 203, a square tube 204, and a spring 205, and two ends of the screw 201 are respectively screwed with a nut 202; the inner cavity of the hollow metal tube 1 is divided into three sections, the upper section and the lower section are square channels, and the middle section is cylindrical Channel, the diameter of the cylindrical channel is smaller than the diameter of the square channel, and the connection between the cylindrical channel and the square channel forms a step. Two square tubes 204 are respectively inserted in the corresponding square channels. One end abuts on the corresponding step, and the other end abuts on the end surface of the corresponding square tube 204. The two steps are the limiting structures of the two springs 205.

As shown in FIG. 10, there are two groups of the short joint 203, the square tube 204, and the spring 205, and the two groups are symmetrically threaded on the screw 201 about the midpoint of the screw 201. When you need to adjust the length of the tooling, you can press the short section 203 at one end or the short section 203 at both ends. Since the short section 203 is connected to or integrated with the square tube 204, the short section 203 slides along the screw 201 with the square tube 204 and the spring 205 Compressed by the square tube 204 to compress, so that the length of the entire knitting tooling can be adjusted. When adjusted to a suitable position, fix the short section 203 at that position and continue to knit. After the knitting is completed, you can press the short section 203 to the end until It is in close contact with the hollow metal tube 1, because the length of the entire tooling is shortened and shorter than the length of the esophageal stent, the esophageal stent can be easily removed from the tooling at this time, saving time and effort.

It should be noted that, in this embodiment, the spring 205 may also be one, as shown in FIG. 12 (the short joints 203 at both ends are pressed), that is, the two sets of short joints 203 and the square tube 204 share one spring 205. In other words, the spring 205 is located between the upper and lower square tubes 204.

In this embodiment, both ends of the screw 201 can be adjusted, which improves the flexibility of adjusting the length of the braided tooling, so that during the process of weaving the esophageal stent, the corresponding short section can be pressed in a targeted manner, thereby adjusting the length of the tooling and ensuring that The quality of braided esophageal stents.

Example 8:

Based on Embodiment 5 or Embodiment 6 or Embodiment 7, when the short joint 203 and the square tube 204 slide up and down along the screw 201, the spring 205 is in a natural or compressed state. When 205 is in a natural state, the distance between the lower end surface of the short joint 203 and the upper end surface of the hollow metal pipe 1 is 2-5 mm.

In order to adapt to the weaving of esophageal scaffolds of various sizes, through multiple tests, this embodiment has obtained that the optimal distance between the short joint 203 and the hollow metal tube 1 is 2 to 5 mm, so that it can be properly contracted and smooth after weaving is completed Take off.

Example 9:

On the basis of Example 4, as shown in FIG. 14, four hollow holes 101 are formed on the outer wall of the middle of the hollow metal pipe 1 (6 rows in FIG. 14, only 4 rows are actually used, and the other 2 rows are used To calibrate the distance), the distance between the two adjacent blind holes 101 is equal, and the distance between the two adjacent blind holes 101 is equal in each circle. Each blind hole 101 is inserted with a screw.

Specifically, in the process of weaving the esophageal stent, in order to adapt or be applicable to various weaving methods, four circles of blind holes 101 are opened in the middle outer wall of the hollow metal tube 1. When weaving, a short rod or The short filament is inserted into the blind hole 101, and then overlaps or crosses the short pole or the short filament according to the specific weaving method. The short filament or the short pole is inserted in the blind hole 101 to realize the short filament or the short pole. Segment of braided stent.

The number of ribs on the outer wall of the hollow metal pipe 1 and the short joint 203 is the same as the number of the ends of the stent to be woven. Specifically, when weaving an esophageal stent, a corresponding knitting tool is selected according to the outline (diameter) of the stent to be woven. After the final knitting is completed, a wire is wound around the end of each edge.

Application method of esophageal braiding tooling includes the following steps:

Tighten the nuts 202 at both ends of the braces of the esophageal stent, fix one end of the wire for braiding the esophagus to the end of the braid of the esophagus, and start braiding the esophagus. After braiding, press the short section 203, short section 203, and square The tube 204 slides along the screw 201, the compression spring 205, the distance between the lower end of the short joint 203 and the upper end of the hollow metal tube 1 is shortened. When it is shortened to the desired position, the nut 202 at the end is tightened, and the esophagus support is removed.

Specifically, the esophageal stent is braided on the outer wall of the short section 203 and the hollow metal tube 1. During the knitting process, if a thread tension occurs, the short section 203 may be pressed. Since the short section 203 and the square tube 204 are connected or integrally formed, The short section 203 slides along the screw 201 with the square tube 204, and the spring 205 is compressed by the square tube 204 to compress, so that the length of the entire knitting tool can be adjusted. When adjusted to a suitable position, the fixed short section 203 is fixed at At this position, continue knitting. After the knitting is completed, press the knuckle 203 to the end until it is in close contact with the hollow metal tube 1. Since the length of the entire tool is shortened and shorter than the length of the esophagus, the esophagus can be easily removed from the tool at this time Save time and effort.

It should be particularly noted that the hollow metal pipe 1 may be one shown in FIG. 10 and FIG. 11, or may be a multi-stage retractable structure composed of a plurality of hollow metal pipes 1.

The above exemplification is merely an illustration of the present invention, and does not constitute a limitation on the protection scope of the present invention. Any design that is the same as or similar to the present invention falls within the protection scope of the present invention. The components and structures that are not described in detail in this embodiment are well-known components and common structures or common means in the industry, and are not described here one by one.

Claims (10)

A segmented esophageal stent is characterized in that it is a cylindrical net-shaped stent with a bell mouth at both ends woven from a single wire. The net-shaped stent is composed of an upper bell mouth section and a lower bell mouth section. It is composed of two sections, and the upper flared section and the lower flared section are connected by a plurality of locking structures. The segmented esophageal stent according to claim 1, wherein the lock structure is a cross-shaped structure formed by overlapping and intersecting monofilaments at the end of the upper bell mouth section and the lower bell mouth section. The segmented esophageal stent according to claim 2, wherein at least three locking structures are provided between the upper flared section and the lower flared section. The segmented esophageal stent according to claim 2, wherein the angle of the bell mouth is 40-50 °. A method for weaving a segmented esophageal stent according to any one of claims 1 to 4, further comprising the following steps: Step 1: punch a blind hole (101) in the middle of the esophageal braiding tooling and insert a screw into the blind hole (101); Step 2: Fix one end of the monofilament to the head of either end of the esophageal braiding jig, and the other end of the monofilament to be overlapped and intertwined on the esophageal braid jig to form a mesh upper and lower bell mouth section. The wire is overlapped and wound at the screw rod to form a cross-shaped locking structure; Step three, according to the knitting method of step two, weaving at least three lock structures; Step 4. After the braiding is completed, heat-set the two ports of the segmented esophageal stent to form a bell mouth with a flare of 40-50 °, and complete the braiding of the segmented esophageal stent. The method of weaving a segmented esophageal stent according to claim 5, wherein the esophageal stent braiding tool comprises a cylindrical hollow metal tube (1), further comprising a screw (201), a short section (203), A square tube (204) and a spring (205), the short joint (203), the square tube (204) and the spring (205) are threaded on the screw rod (201) from top to bottom, and the screw rod (201) is threaded Passing the hollow metal pipe (1), a limiting structure is provided in the hollow metal pipe (1), one end of the spring (205) is limited by the limiting structure, and the other end bears against the square pipe (204) The outer diameter of the short joint (203) is the same as the outer diameter of the hollow metal tube (1). The inner cavity of the hollow metal tube (1) is a square channel. In the square channel of the hollow metal pipe (1), the short joint (203) and the square pipe (204) are fixedly connected or integrally formed and can slide along the screw (201); On the outer wall of the hollow metal pipe (1) and the short joint (203), several ribs are evenly spaced in the circumferential direction, and the rib on the hollow metal pipe (1) and the rib on the short joint (203) are evenly spaced. One-to-one correspondence. The method for weaving a segmented esophageal stent according to claim 6, characterized in that the short section (203), the square tube (204) and the spring (205) are all one, and two parts of the screw (201) One nut (202) is screwed on each end; The limiting structure is a circular hole opened at one end of the hollow metal pipe (1), the diameter of the circular hole is smaller than the diameter of the spring (205), and the other end of the hollow metal pipe (1) is opened It is a square hole, and the square pipe (204) is inserted into the hollow metal pipe (1) through the square hole. The method for weaving a segmented esophageal stent according to claim 6, characterized in that the screw (201) is passed through the short section (203) and the square tube (204) sequentially from the two ends to the midpoint. A spring (205), and a nut (202) is screwed on each end of the screw (201); The inner cavity of the hollow metal pipe (1) is divided into three sections, the upper section and the lower section are square channels, the middle section is a cylindrical channel, the diameter of the cylindrical channel is smaller than that of the square channel, and the cylindrical channel and the A step is formed at the joint of the square channel, and two square tubes (204) are respectively inserted in the corresponding square channels. One end of the two springs (205) abuts the corresponding step, and the other end abuts the corresponding square tube (204). On the end face of the two, the two steps are the limiting structure of two springs (205). The method for weaving a segmented esophageal stent according to claim 6 or 7 or 8, characterized in that, when the short section (203) and the square tube (204) slide up and down along the screw (201), The spring (205) is in a natural or compressed state. When the spring (205) is in a natural state, the distance between the lower end face of the short joint (203) and the upper end face of the hollow metal pipe (1) is 2 ~ 5mm. The method for weaving a segmented esophageal stent according to claim 9, characterized in that: four circles of blind holes (101) are opened on the outer wall of the middle portion of the hollow metal tube (1), and two adjacent circles of blind holes (101) ) Are equal in distance, and the distance between two adjacent blind holes (101) in each circle is equal. Each blind hole (101) is inserted with a screw; the hollow metal tube (1) and the short The number of ribs on the outer wall of the joint (203) is the same as the number of the ends of the stent to be knitted.

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