CN108771572B - Sectional type esophagus support and braiding method thereof - Google Patents
Sectional type esophagus support and braiding method thereof Download PDFInfo
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- CN108771572B CN108771572B CN201811047146.6A CN201811047146A CN108771572B CN 108771572 B CN108771572 B CN 108771572B CN 201811047146 A CN201811047146 A CN 201811047146A CN 108771572 B CN108771572 B CN 108771572B
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- hollow metal
- stent
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
- A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2240/00—Manufacturing or designing of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2240/001—Designing or manufacturing processes
Abstract
The invention provides a sectional esophagus support and a braiding method thereof, which is a cylindrical net support with two ends of a horn mouth formed by braiding a monofilament, wherein the net support consists of an upper horn mouth section and a lower horn mouth section, and the upper horn mouth section and the lower horn mouth section are connected through a plurality of locking structures. Compared with the existing hook-type lock catch, the cross-shaped lock catch structure can enhance the supporting force of the whole esophageal stent and has better rigidity; the two ends of the esophageal stent are both horn mouths, the horn mouths at the upper part are beneficial to food passing after the esophageal stent is put into the esophagus, and the horn mouths at the lower part can prevent the stent from shifting, so that the stent has good fixing effect and is accurately fixed; the whole weaving process of the whole stent is completed by only one silk thread, so that the rigidity of the esophageal stent is improved, the axial compression deformation of the esophageal stent can be reduced, and the normal use of the esophageal stent is ensured.
Description
Technical Field
The invention belongs to the field of medical equipment, and particularly relates to a sectional esophageal stent and a braiding method thereof.
Background
Esophageal stenosis or obstruction is a common complication of digestive tract diseases, and a common treatment method is to treat the esophageal stenosis and obstruction by adopting an inner stent, specifically, a biodegradable stent is placed at a lesion, the biodegradable stent is formed in the esophagus for a short period of time, has good biocompatibility, is completely dissolved later, and can adjust the degradation time of the stent according to clinical needs, so that the complication of a permanent stent is avoided. The shape and the weaving method of esophagus support are various, and what is commonly used at present is sectional type support, and sectional type support's segmentation part adopts the hasp connection of mutually hooking, and whole support adopts many silk threads to weave to form, causes the support to shrink easily in the axial, and whole rigidity is relatively poor, further leads to both ends open-ended stationary power to reduce, and the support can inwards shrink at the middle part simultaneously, leads to the internal diameter of support to diminish, is unfavorable for food to pass through, long-time use can shorten the life-span of esophagus support even.
Disclosure of Invention
The invention aims to solve the problems that the existing esophageal stent is easy to shorten in the axial direction and poor in overall rigidity due to the fact that a plurality of wires are adopted for weaving.
The invention provides a sectional esophagus support, which is a cylindrical net support woven by a monofilament and provided with horn mouths at two ends, wherein the net support consists of an upper horn mouth section and a lower horn mouth section, and the upper horn mouth section and the lower horn mouth section are connected through a plurality of lock catch structures.
Further, the locking structure is a cross structure formed by overlapping and crossing monofilaments at the connection part of the tail end of the upper horn mouth section and the tail end of the lower horn mouth section.
Further, at least three locking structures are arranged between the upper horn mouth section and the lower horn mouth section.
Further, the angle of the flare is 40-50 °.
Further, a braiding method of the segmented esophageal stent comprises the following steps:
step one: punching a blind hole in the middle of the esophageal stent braiding tool and inserting a screw rod into the blind hole;
step two: one end of a monofilament is fixed at the head of any one end of an esophageal stent braiding tool, the other end of the monofilament is overlapped and crossed and wound on the esophageal stent braiding tool to form a net-shaped upper horn mouth section and lower horn mouth section, and the monofilament is overlapped and crossed and wound at a screw rod to form a cross-shaped locking structure;
step three, knitting at least three lock catch structures according to the knitting method of the step two;
and fourthly, after the braiding is completed, performing heat setting on the two ports of the segmented esophageal stent to form a horn mouth with a flaring of 40-50 degrees, and completing the braiding of the segmented esophageal stent.
Further, the esophageal stent braiding tool comprises a cylindrical hollow metal tube, a screw rod, a short section, a square tube and a spring, wherein the short section, the square tube and the spring sequentially penetrate through the screw rod from top to bottom, the screw rod penetrates through the hollow metal tube, a limiting structure is arranged in the hollow metal tube, one end of the spring is limited by the limiting structure, the other end of the spring is propped against the end face of the square tube, the outer diameter of the short section is the same as the outer diameter of the hollow metal tube, the inner cavity of the hollow metal tube is a square channel, the square tube is matched and inserted in the square channel of the hollow metal tube, and the short section and the square tube are fixedly connected or integrally formed and can slide along the screw rod;
a plurality of edges are uniformly arranged on the outer walls of the hollow metal pipe and the short joint at intervals in the circumferential direction, and the edges on the hollow metal pipe correspond to the edges on the short joint one by one.
Further, the nipple, the square pipe and the spring are all one, and nuts are screwed at two ends of the screw respectively;
the limiting structure is a round hole formed in one end of the hollow metal tube, the diameter of the round hole is smaller than that of the spring, a square hole is formed in the other end of the hollow metal tube, and the square tube penetrates through the square hole and is inserted into the hollow metal tube.
Further, the screw rod sequentially penetrates through the short joint, the square pipe and the spring from the two end parts to the middle point, and nuts are screwed at the two ends of the screw rod respectively;
the inner cavity of the hollow metal tube is divided into three sections, the upper section and the lower section are square channels, the middle section is a cylindrical channel, the aperture of the cylindrical channel is smaller than that of the square channel, a step is formed at the joint of the cylindrical channel and the square channel, two square tubes are respectively inserted into the corresponding square channels, one ends of the two springs are abutted to the corresponding step, the other ends of the two springs are abutted to the end faces of the corresponding square tubes, and the two steps are limiting structures of the two springs.
Further, when the nipple and the square pipe slide up and down along the screw rod, the spring is in a natural or compressed state, and when the spring is in a natural state, the distance between the lower end surface of the nipple and the upper end surface of the hollow metal pipe is 2-5 mm.
Further, the outer wall of the middle part of the hollow metal pipe is provided with a circle of blind holes, the distances between two adjacent circles of blind holes are equal, and a screw rod is inserted into each blind hole; the number of the edges on the outer walls of the hollow metal tube and the pup joint is the same as the number of the silk threads at the end part of the bracket to be woven.
The invention has the beneficial effects that: according to the sectional type esophageal stent and the braiding method thereof, the sectional type esophageal stent is formed by braiding monofilaments, the braided parts are mutually overlapped and are mutually crossed and wound to form a net-shaped stent, and particularly, a crossed cross-shaped locking structure is adopted between the sectional parts; the two ends of the esophageal stent are both horn mouths, the horn mouths at the upper part are beneficial to food passing after the esophageal stent is put into the esophagus, and the horn mouths at the lower part can prevent the stent from shifting, so that the stent has good fixing effect and is accurately fixed; the whole weaving process of the whole stent is completed by only one silk thread, so that the rigidity of the esophageal stent is improved, the axial compression deformation of the esophageal stent can be reduced, and the normal use of the esophageal stent is ensured.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
Figure 1 is a schematic structural view of a segmented esophageal stent.
Fig. 2 to 9 are schematic views of the knitting steps of example 4.
Fig. 10 is a perspective view of the esophageal stent braiding tool.
Fig. 11 is an elevation view of the esophageal stent braiding tool.
Figure 12 is a cross-sectional view of an esophageal stent braiding tool with a spring in the center metal tube.
FIG. 13 is a cross-sectional view of an esophageal stent braiding tool with two springs in the center metal tube.
Fig. 14 is a schematic view of a center metal tube with blind holes.
Reference numerals illustrate:
1. a hollow metal tube; 101. a blind hole;
201. a screw; 202. a nut; 203. a short section; 204. square tube; 205. and (3) a spring.
Detailed Description
Example 1:
as shown in fig. 1, the embodiment provides a sectional esophageal stent, which is a cylindrical mesh stent woven by a monofilament and having two ends with bell mouths, wherein the mesh stent consists of an upper bell mouth section and a lower bell mouth section, and the upper bell mouth section and the lower bell mouth section are connected through a plurality of locking structures.
The sectional type esophagus support of this embodiment comprises upper horn mouth section and lower horn mouth section, namely, the both ends of esophagus support are horn mouth form, and the horn mouth design can make the esophagus support after the esophagus is gone into to the lower part, and upper portion's horn mouth does benefit to food and passes through, and lower part's horn mouth can prevent that the support from shifting, plays good fixed action to the support, makes its accurate location; the whole weaving process of the whole stent is completed by only one silk thread, so that the rigidity of the esophageal stent is improved, the axial compression deformation of the esophageal stent can be reduced, and the normal use of the esophageal stent is ensured.
Example 2:
on the basis of the embodiment 1, compared with the existing hook-type lock catch, the lock catch structure in the embodiment is a cross structure formed by overlapping and crossing monofilaments at the connecting position of the tail end of the upper bell mouth section and the tail end of the lower bell mouth section.
The cross-shaped locking structure can enhance the supporting force of the whole esophageal stent and has better rigidity. The whole weaving process of the whole stent is completed by only one silk thread, so that the rigidity of the esophageal stent is improved, the axial compression deformation of the esophageal stent can be reduced, and the normal use of the esophageal stent is ensured.
Example 3:
on the basis of embodiment 2, in order to ensure a stable shape of the entire esophageal stent, avoiding deformation, at least three locking structures are provided between the upper and lower flare sections. The angle of the horn mouth is 40-50 degrees, after the esophageal stent is placed into the esophagus, the horn mouth on the upper part is beneficial to food passing, the horn mouth on the lower part can prevent the stent from shifting, and the horn mouth has good fixing effect on the stent, so that the stent is accurately fixed.
Example 4:
a method for braiding a segmented esophageal stent, comprising the steps of:
step one: a blind hole 101 is formed in the middle of the esophageal stent braiding tool, and a screw rod is inserted into the blind hole 101;
step two: one end of a monofilament is fixed at the head of any one end of an esophageal stent braiding tool, the other end of the monofilament is overlapped and crossed and wound on the esophageal stent braiding tool to form a net-shaped upper horn mouth section and lower horn mouth section, and the monofilament is overlapped and crossed and wound at a screw rod to form a cross-shaped locking structure;
step three, knitting at least three lock catch structures according to the knitting method of the step two;
and fourthly, after the braiding is completed, performing heat setting on the two ports of the segmented esophageal stent to form a horn mouth with a flaring of 40-50 degrees, and completing the braiding of the segmented esophageal stent.
The weaving method of the sectional type esophagus support shown in fig. 2-9 comprises the following specific steps:
before describing the steps of the braiding method, it should be specifically noted that P1-P12 and R1-R12 are all drilled with blind holes on the esophageal stent tooling where these points are located, 4 circles of blind holes in total, and a screw rod is inserted into each blind hole, in order to clearly illustrate how the esophageal stent is braided, the positions of the 4 circles of blind holes (screw rods) are marked in fig. 2-9, and the 4 screw rods in the figure are merely illustrative.
As shown in fig. 2, the end of a single braided monofilament is fixed at A1, then from a starting point A1 through D5 to P1, and then from P1 through F6, E8, D10 to B1, and B1 through a2 to A3;
as shown in fig. 3, the monofilament is connected from A3 to G1 through F11, then from G1 through p2 to G3 (the circle in the figure is a screw rod), and bypasses G3 to R4 (the screw rod), R4 is from H6, I8 to L1, then from L1 to N5, N5 is from J11 to I1, and I1 is from H3 to R5;
as shown in fig. 4, the monofilament is connected 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, J1 through K4 to N9, N9 through M11 to K1, K1 through H6 to R9, R9 through H11 to I1, I1 through J5 to N11, N11 through M12 to L1;
as shown in fig. 5, L1 is connected via I6 to R10 (where the lead screw is inserted), bypassing R10 to P4 (where the lead screw is inserted), and passing from P4 via F8 to C1;
as shown in fig. 6, C1 is connected through B3 to A5, A5 is connected through D10 to F1, F1 is connected through G3 to P5, and P5 is connected through D12 to D1;
as shown in fig. 7, D1 through b4 to A7, A7 through b9 to E1, E1 through F4 to P7, P7 through E12 to E1, E1 through b6 to A9, A9 through b11 to D1, D1 through F6 to P9, P9 through G11 to F1, F1 through C7 to a11, a11 through b12 to C1, C1 through F6 to P10 (where the lead screw is inserted), around P10 to R11 (where the lead screw is inserted), R11 through R12 to H1;
as shown in fig. 8, H1 goes through K8 to N1, N1 goes through H10 to R1, R1 goes through J8 to M1, M1 goes through N2 to N3, N3 goes through J9 to H1, H1 goes through R2 to R3 (where a screw is inserted), bypassing R3 to P11;
as shown in fig. 9, P11 is connected through P12 to G1, and then through D8 to A1 from G1;
the braiding of the segmented esophageal stent is completed, and the braided finished product is shown in figure 1.
It should be noted that the braiding method provided by the present invention uses only one thread throughout.
Example 5:
the embodiment provides an esophageal stent braiding tool, which comprises a cylindrical hollow metal tube 1, as shown in fig. 10, 11 and 12, a screw 201, a nipple 203, a square tube 204 and a spring 205, wherein the nipple 203, the square tube 204 and the spring 205 sequentially penetrate through the screw 201 from top to bottom, the screw 201 penetrates through the hollow metal tube 1, a limiting structure is arranged in the hollow metal tube 1, one end of the spring 205 is limited by the limiting structure, the other end of the spring is abutted against the end face of the square tube 204, the outer diameter of the nipple 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, the square tube 204 is matched and inserted in the square channel of the hollow metal tube 1, and the nipple 203 and the square tube 204 are fixedly connected or integrally formed and can slide along the screw 201;
a plurality of ribs are uniformly arranged on the outer walls of the hollow metal pipe 1 and the short section 203 at intervals in the circumferential direction (as shown in fig. 13), and the ribs on the hollow metal pipe 1 are in one-to-one correspondence with the ribs on the short section 203 (as shown in fig. 13).
The working principle or working engineering of the esophageal stent braiding tool provided by the embodiment is as follows:
braided the esophageal stent on the outer wall of nipple 203 and hollow metal tube 1, braided in-process, if the condition of silk thread tensioning appears, can press nipple 203, because nipple 203 and square tube 204 are connected or integrated into one piece, nipple 203 slides along screw 201 along square tube 204, spring 205 receives square tube 204's extrusion and compresses, and then make the length of whole braiding frock realize adjustable, when adjusting to suitable position, fixed nipple 203 is in this position, continue to weave, after the completion of braiding, can press nipple 203 until hugging closely with hollow metal tube 1, because the length of whole frock shortens and is shorter than the length of esophageal stent, can easily take down the esophageal stent from the frock this moment.
It should be noted that, in this embodiment, the inner cavity of the hollow metal tube 1 is a square channel, so that when the square tube 204 is inserted into the hollow metal tube 1, the edges on the outer walls of the hollow metal tube 1 and the nipple 203 can be in one-to-one correspondence, so as to facilitate braiding of the esophageal stent.
The frock is woven to esophageal stent that this embodiment provided can weave the esophageal stent on the outer wall of nipple joint, cavity tubular metal resonator, reserves 2 ~ 5 mm's distance between nipple joint and the cavity tubular metal resonator, can press the nipple joint according to the needs of weaving, adjusts the distance between nipple joint and the cavity tubular metal resonator, guarantees that the esophageal stent receives elastic holding power in the weaving process, and in addition the esophageal stent can be through pressing the nipple joint to the bottom until hugging closely with the cavity tubular metal resonator after weaving is accomplished, conveniently takes out the esophageal stent. Therefore, the esophageal stent braiding tool provided by the invention improves the supporting force on the esophageal stent by adjusting the whole length, avoids the occurrence of fracture or wire breakage, is particularly suitable for degradable esophageal stents, ensures the quality and efficiency of braiding the esophageal stents, and has high practical value.
Example 6:
on the basis of the embodiment 5, as shown in fig. 11, the nipple 203, the square tube 204 and the spring 205 are all one, and two nuts 202 are respectively screwed at two ends of the screw 201; the limiting structure is a circular hole formed in one end portion of the hollow metal tube 1, the diameter of the circular hole is smaller than that of the spring 205, a square hole is formed in the other end portion of the hollow metal tube 1, and the square tube 204 penetrates through the square hole and is inserted into the hollow metal tube 1.
The embodiment embodies a structure for adjusting the length of the esophageal stent, specifically, as shown in fig. 11, a screw 201 passes through a hollow metal tube 1, a nut 202 is screwed on the top end and the bottom end of the screw, the top end nut 202 is used for fixing the nipple 203 to prevent rebound after pressing, and the bottom end nut 202 is used for limiting and positioning the screw 202.
When the tool is used, the nut 202 at the bottom end is screwed, if the tool length is required to be adjusted, the short section 203 is pressed until the tool moves downwards to a proper position, and then the nut 202 at the top end is screwed until the tool is tightly attached to the top end of the short section 203; after the stent is woven, the short section 203 is pressed until the short section is tightly attached to the hollow metal tube 1, then the nut 202 at the top end is rotated until the short section 203 is tightly attached to the top end, and the esophageal stent is taken down.
The frock is woven to esophageal stent that this embodiment provided can weave the esophageal stent on the outer wall of nipple joint, cavity tubular metal resonator, reserves 2 ~ 5 mm's distance between nipple joint and the cavity tubular metal resonator, can press the nipple joint according to the needs of weaving, adjusts the distance between nipple joint and the cavity tubular metal resonator, guarantees that the esophageal stent receives elastic holding power in the weaving process, and in addition the esophageal stent can be through pressing the nipple joint to the bottom until hugging closely with the cavity tubular metal resonator after weaving is accomplished, conveniently takes out the esophageal stent. Therefore, the esophageal stent braiding tool provided by the invention improves the supporting force on the esophageal stent by adjusting the whole length, avoids the occurrence of fracture or wire breakage, is particularly suitable for degradable esophageal stents, ensures the quality and efficiency of braiding the esophageal stents, and has high practical value.
Example 7:
on the basis of embodiment 5, this embodiment provides a solution different from embodiment 6, specifically, as shown in fig. 10 and 13, the screw 201 sequentially wears the nipple 203, the square tube 204, and the spring 205 from two ends to a middle point thereof, and two nuts 202 are respectively screwed at two ends of the screw 201; the inner cavity of the hollow metal tube 1 is divided into three sections, the upper section and the lower section are square channels, the middle section is a cylindrical channel, the aperture of the cylindrical channel is smaller than that of the square channel, and the junction of the cylindrical channel and the square channel forms steps, two square tubes 204 are respectively inserted in the corresponding square channels, one ends of the two springs 205 are abutted to the corresponding steps, the other ends of the two springs 205 are abutted to the end faces of the corresponding square tubes 204, and the two steps are limiting structures of the two springs 205.
As shown in fig. 10, the nipple 203, square tube 204, and spring 205 have two groups that are symmetrically threaded onto the screw 201 about the midpoint of the screw 201. When the length of the tool is required to be adjusted, the short section 203 at one end can be pressed or the short sections 203 at two ends can be pressed, as the short sections 203 are connected with the square pipe 204 or integrally formed, the short sections 203 slide along the screw 201 with the square pipe 204, the springs 205 are extruded by the square pipe 204 to be compressed, the length of the whole braiding tool is further adjustable, when the tool is adjusted to a proper position, the short sections 203 are fixed at the position, braiding is continued, after braiding is completed, the short sections 203 can be pressed until the short sections are tightly attached to the hollow metal pipe 1, and because the length of the whole tool is shortened and shorter than the length of the esophageal stent, the esophageal stent can be easily taken down from the tool at the moment, and time and labor are saved.
It should be noted that, in this embodiment, the spring 205 may be one (as shown in fig. 12, the nipple 203 at both ends is pressed), that is, the two sets of nipples 203 and the square tube 204 share one spring 205, in other words, the spring 205 is located between the upper square tube 204 and the lower square tube 204.
In this embodiment, both ends of the screw 201 can be adjusted, so that flexibility of adjusting the length of the braiding tool is improved, and a corresponding nipple can be pressed in a targeted manner in the process of braiding the esophageal stent, so that the tool length is adjusted, and the quality of braiding the esophageal stent is ensured.
Example 8:
on the basis of embodiment 5, embodiment 6 or embodiment 7, when the nipple 203 and the square tube 204 slide up and down along the screw 201, the spring 205 is in a natural or compressed state, and when the spring 205 is in a natural state, the distance between the lower end surface of the nipple 203 and the upper end surface of the hollow metal tube 1 is 2-5 mm.
In order to adapt to the braiding of esophageal stents of various sizes, through multiple experiments, the optimal distance between the short section 203 and the hollow metal tube 1 is 2-5 mm, so that the short section can be reasonably contracted, and the short section can be smoothly taken down after the braiding is completed.
Example 9:
on the basis of embodiment 4, as shown in fig. 14, 4 circles of blind holes 101 (6 rows in fig. 14, only 4 rows are actually used, and the other 2 rows are used for calibrating the distance) are formed on the outer wall of the middle part of the hollow metal tube 1, the distances between two adjacent circles of blind holes 101 are equal, and a screw rod is inserted into each blind hole 101.
Specifically, in the process of braiding an esophageal stent, in order to adapt to or adapt to each braiding method, the tooling of the embodiment is provided with 4 circles of blind holes 101 on the outer wall of the middle part of the hollow metal tube 1, during braiding, short rods or short wires can be inserted into the blind holes 101, then overlapped or crossed around the short rods or short wires according to a specific braiding method, short wires or short rods are inserted into the blind holes 101, and segmentation of the braided stent is realized at the short wires or short rods.
The number of ribs on the outer walls of the hollow metal tube 1 and the nipple 203 is the same as the number of heads of the end wires of the stent to be woven. Specifically, when the esophageal stent is braided, a corresponding braiding tool is selected according to the contour (diameter) of the stent to be braided, and after the final braiding is finished, the end head of each rib is wound with a silk thread.
The application method of the esophageal stent braiding tool comprises the following steps:
screwing nuts 202 at two ends of the esophageal stent braiding tool, fixing one end of a silk thread for braiding the esophageal stent at one end of the esophageal stent braiding tool, starting braiding the esophageal stent, after the esophageal stent braiding is completed, pressing a short section 203, sliding the short section 203 and a square tube 204 along a screw 201, compressing a spring 205, shortening the distance between the lower end face of the short section 203 and the upper end face of a hollow metal tube 1, screwing the nuts 202 at the end when the distance is shortened to a required position, and taking down the esophageal stent.
Specifically, weave the esophagus support on the outer wall of nipple 203 and cavity tubular metal resonator 1, weave the in-process, if the condition of silk thread tensioning appears, can press nipple 203, because nipple 203 and square tube 204 are connected or integrated into one piece, nipple 203 slides along screw 201 with square tube 204, spring 205 receives square tube 204's extrusion and compresses, and then make the length of whole frock of weaving realize adjustable, when adjusting to suitable position, fixed nipple 203 is in this position, continue to weave, weave the back of accomplishing, can press nipple 203 to the bottom until hugging closely with cavity tubular metal resonator 1, because the length of whole frock shortens and is shorter than the length of esophagus support, can easily take down the esophagus support from the frock this moment.
The hollow metal tube 1 may be one hollow metal tube 1 as shown in fig. 10 and 11, or may be a multi-stage telescopic structure composed of a plurality of hollow metal tubes 1.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention. The components and structures not specifically described in this embodiment are well known in the art and are not described in detail herein.
Claims (5)
1. The method for braiding the sectional esophageal stent is characterized in that the sectional esophageal stent is a cylindrical reticular stent which is braided by a monofilament and has two ends with a bell mouth, the reticular stent consists of an upper bell mouth section and a lower bell mouth section, and the upper bell mouth section and the lower bell mouth section are connected through a plurality of locking structures;
the braiding method comprises the following steps:
step one: punching a blind hole (101) in the middle of the esophageal stent braiding tool, and inserting a screw rod into the blind hole (101);
step two: one end of a monofilament is fixed at the head of any one end of an esophageal stent braiding tool, the other end of the monofilament is overlapped and crossed and wound on the esophageal stent braiding tool to form a net-shaped upper horn mouth section and lower horn mouth section, and the monofilament is overlapped and crossed and wound at a screw rod to form a cross-shaped locking structure;
step three, knitting at least three lock catch structures according to the knitting method of the step two;
fourthly, after the braiding is completed, performing heat setting on the two ports of the segmented esophageal stent to form a flare with a flaring of 40-50 degrees, and completing the braiding of the segmented esophageal stent;
the esophageal stent braiding tool comprises a cylindrical hollow metal tube (1), and further comprises a screw rod (201), a nipple (203), a square tube (204) and a spring (205), wherein the nipple (203), the square tube (204) and the spring (205) sequentially penetrate through the screw rod (201) from top to bottom, the screw rod (201) penetrates through the hollow metal tube (1), a limiting structure is arranged in the hollow metal tube (1), one end of the spring (205) is limited by the limiting structure, the other end of the spring is abutted to the end face of the square tube (204), the outer diameter of the nipple (203) is identical to the outer diameter of the hollow metal tube (1), the inner cavity of the hollow metal tube (1) is a square channel, the square tube (204) is matched and inserted in the square channel of the hollow metal tube (1), and the nipple (203) and the square tube (204) are fixedly connected or integrally formed and can slide along the screw rod (201);
the outer walls of the hollow metal pipe (1) and the short joint (203) are uniformly provided with a plurality of edges at intervals in the circumferential direction, and the edges on the hollow metal pipe (1) correspond to the edges on the short joint (203) one by one.
2. The method of braiding a segmented esophageal stent of claim 1, wherein: the nipple (203), the square tube (204) and the spring (205) are all one, and nuts (202) are respectively screwed at two ends of the screw rod (201);
the limiting structure is a round hole formed in one end portion of the hollow metal tube (1), the diameter of the round hole is smaller than that of the spring (205), a square hole is formed in the other end portion of the hollow metal tube (1), and the square tube (204) penetrates through the square hole and is inserted into the hollow metal tube (1).
3. The method of braiding a segmented esophageal stent of claim 1, wherein: the screw rod (201) sequentially wears the short joint (203), the square pipe (204) and the spring (205) from two end parts to the middle point, and nuts (202) are respectively screwed at two ends of the screw rod (201);
the inner cavity of the hollow metal tube (1) is divided into three sections, the upper section and the lower section are square channels, the middle section is a cylindrical channel, the aperture of the cylindrical channel is smaller than that of the square channel, the cylindrical channel and the joint of the square channels form steps, two square tubes (204) are respectively inserted in the corresponding square channels, one ends of the two springs (205) are abutted to the corresponding steps, the other ends of the two springs are abutted to the end faces of the corresponding square tubes (204), and the two steps are limiting structures of the two springs (205).
4. A method of braiding a segmented esophageal stent as claimed in claim 1, 2 or 3, wherein: when the short section (203) and the square pipe (204) slide up and down along the screw rod (201), the spring (205) is in a natural or compressed state, and when the spring (205) is in a natural state, the distance between the lower end surface of the short section (203) and the upper end surface of the hollow metal pipe (1) is 2-5 mm.
5. The method of braiding a segmented esophageal stent of claim 4, wherein: 4 circles of blind holes (101) are formed in the outer wall of the middle of the hollow metal pipe (1), the distances between two adjacent circles of blind holes (101) are equal, and a screw rod is inserted into each blind hole (101); the number of edges on the outer walls of the hollow metal tube (1) and the short section (203) is the same as the number of heads of the silk thread at the end part of the bracket to be woven.
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| CN110251282B (en) * | 2019-06-14 | 2020-11-10 | 上海七木医疗器械有限公司 | Polymer scaffold weaving and forming method and end face processing equipment |
| CN111544168B (en) * | 2020-05-13 | 2021-07-09 | 东华大学 | Integrated woven covered stent edge folding process |
| CN116327460A (en) * | 2021-12-24 | 2023-06-27 | 微创优通医疗科技(嘉兴)有限公司 | Support and support braiding method |
| CN116687625B (en) * | 2023-08-08 | 2023-11-03 | 上海心纪元医疗科技有限公司 | Bracket for polymer valve and manufacturing method thereof |
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| US20040088037A1 (en) * | 2000-12-27 | 2004-05-06 | American Medical Systems, Inc. | Method and apparatus for making a braided stent with spherically ended wires |
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| CN204562475U (en) * | 2015-02-08 | 2015-08-19 | 韩新巍 | A kind of bottle shape stent in esophagus being applicable to treatment high position of esophageal stenosis |
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