CN219074239U

CN219074239U - Biliary tract support manufacturing clamp

Info

Publication number: CN219074239U
Application number: CN202222868195.4U
Authority: CN
Inventors: 罗永春; 葛泉波; 冯志辉
Original assignee: Leo Medical Co ltd
Current assignee: Leo Medical Co ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-05-26
Anticipated expiration: 2032-10-28

Abstract

The utility model relates to a biliary tract stent manufacturing clamp, which comprises a clamp main body, wherein a plurality of pins are arranged on the clamp main body in the circumferential direction and the length direction, and the pins are detachably connected with the clamp main body; the pins are arranged in rows along the circumferential direction and in rows along the length direction; the pins of different rows have the same or different numbers, and the pins of different columns have the same or different numbers; the clamp body is provided with grooves at the periphery of at least part of the pins, the width of each groove is not smaller than the diameter of the braided wire of the biliary tract stent, and the grooves can provide certain buffer for the wires at the crossing so as to reduce stress and avoid breakage of the wires at the crossing due to folding.

Description

Biliary tract support manufacturing clamp

Technical Field

The utility model relates to the technical field of interventional medical devices, in particular to a biliary tract stent manufacturing clamp and a biliary tract stent manufacturing method.

Background

The biliary tract system has the functions of secretion, storage, concentration and bile delivery, and has important regulation function on the discharge of bile into duodenum. Malignant biliary obstruction caused by malignant tumors such as biliary tract cancer, liver cancer, pancreatic cancer and metastatic cancer has a high incidence rate, and is found to be often advanced. Implantation of biliary stents at stenosed or occluded sites is a better method of treating biliary obstruction. The biliary tract stent not only has the functions of reducing pressure and draining, supporting and facilitating healing of biliary tract, but also has the functions of observing bile condition, postoperative biliary tract radiography and the like.

After being implanted into the biliary tract of a human body, the biliary tract stent can be freely expanded at the body temperature, thereby ensuring the smoothness of the biliary tract. Typically, biliary stents are made of shape memory alloys (e.g., nitinol) that are capable of maintaining a distending force at body temperature.

In the prior art, the biliary tract stent manufacturing clamp is mostly in a long cylindrical shape, and when the biliary tract stent manufacturing clamp is used for the cross knitting of wires at a pin position, the wires are easy to break because the wires are tightly attached to the surface of the clamp, so that the stress of the wires at the cross position is larger.

Disclosure of Invention

The utility model discloses a biliary tract stent manufacturing clamp which is used for solving the technical problems existing in the prior art.

The utility model adopts the following technical scheme:

the application provides a biliary tract stent manufacturing clamp, which comprises a clamp main body, wherein a plurality of pins are arranged on the clamp main body in the circumferential direction and the length direction, and the pins are detachably connected with the clamp main body;

the pins are arranged in rows along the circumferential direction of the clamp body and in columns along the length direction; the pins of different rows have the same or different numbers, and the pins of different columns have the same or different numbers;

the clamp body is provided with grooves around at least part of the pins, the width of the grooves is not smaller than the diameter of the braided wires of the biliary tract stent, and the grooves are used for reducing the stress when the wires cross at the grooves.

As a preferred solution, the groove is arranged around the pin, the groove being configured as a ring.

As a preferred solution, grooves are provided along the rows of pins, the grooves being configured as elongated grooves.

As a preferred solution, the grooves are arranged along a row of pins, the grooves being configured as circular rings.

As a preferred solution, the outer circumference of each row of adjacent pins is provided with grooves, the grooves being configured as an arc, and/or the outer circumference of each column of adjacent pins is provided with grooves, the grooves being configured as an elongated groove.

As the preferable technical scheme, the clamp main body is provided with a plurality of positioning holes, the outer contours of the positioning holes are matched with the outer contours of the pins, and the positioning holes and the pin can be detachably connected;

the number of the positioning holes is not less than the number of the pins.

As a preferred embodiment, the positioning holes are arranged in a matrix on the jig body, and the pins are provided in the positioning holes at intervals or adjacently.

As a preferable technical scheme, the clamp body is in a long cylindrical shape; the clamp body is provided with a reducing structure, and the diameter of the clamp body gradually increases from the middle part to the two sides.

As a preferred solution, the pins of the different rows have the same or different dimensions and the pins of the different columns have the same or different dimensions.

As a preferred solution, the pins in the same row have the same or different dimensions and the pins in the same column have the same or different dimensions.

The technical scheme adopted by the utility model can achieve the following beneficial effects:

the application provides a novel biliary tract support makes anchor clamps, anchor clamps main part is equipped with the recess around the round pin, when the wire rod that is used for making biliary tract support is crossed in one side or both sides of round pin, because the existence of recess, can provide certain buffering for the wire rod of junction to reduce stress, avoid the wire rod to break because of the discount in the junction.

Further, in order to satisfy different braiding manners or braiding structures of the biliary tract stent, the grooves provided on the clamp may be provided along a circumferential direction or a length direction of the clamp body, and each groove may correspond to an entire row/column of pins or a portion of pins in an entire row/column.

Furthermore, positioning holes are distributed throughout the clamp body and are used for being detachably connected with the pins, the positioning holes are preferably arranged in an array shape, the number of the positioning holes is larger than that of the pins, and the specific arrangement of the pins can be set according to actual needs.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments are briefly described below to form a part of the present utility model, and the exemplary embodiments of the present utility model and the description thereof illustrate the present utility model and do not constitute undue limitations of the present utility model. In the drawings:

FIG. 1 is a schematic view showing the structure of a biliary tract stent manufacturing jig according to a preferred embodiment of the present utility model disclosed in example 1;

FIG. 2 is a perspective view showing a biliary tract stent manufacturing jig according to a preferred embodiment of the present utility model disclosed in example 1;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a top view of a biliary stent fabrication jig in accordance with a preferred embodiment of the disclosure in example 1 of the present utility model;

FIG. 5 is a schematic view showing the structure of a clamp body in a preferred embodiment disclosed in example 1 of the present utility model;

FIG. 6 is a plan view of a pin on a biliary stent manufacturing jig in accordance with a preferred embodiment of the present utility model disclosed in example 1;

FIG. 7 is a plan view of a pin on a biliary stent manufacturing jig in accordance with another preferred embodiment of the disclosure in example 1 of the present utility model;

FIG. 8 is a plan view of a pin on a biliary stent manufacturing jig in accordance with another preferred embodiment of the present utility model disclosed in example 1;

FIG. 9 is an expanded view of a biliary stent of the prior art;

FIG. 10 is a plan view of a pin on a biliary stent manufacturing jig in accordance with a preferred embodiment of the present utility model disclosed in example 2;

FIGS. 11 a-11 d are views showing the process of manufacturing a first cylindrical mesh structure in accordance with a preferred embodiment of the present utility model disclosed in example 2;

FIGS. 12 a-12 d are views showing the process of manufacturing a second cylindrical mesh structure according to a preferred embodiment of the present utility model disclosed in example 2;

FIG. 13 is a schematic view showing a partial structure of a biliary stent in a preferred embodiment disclosed in example 2 of the present utility model;

FIG. 14 is a schematic view showing a partial structure of a biliary stent in another preferred embodiment disclosed in example 2 of the present utility model;

FIG. 15 is an enlarged view of a portion of a non-self-locking structure in accordance with a preferred embodiment of the present utility model as disclosed in example 2;

fig. 16 is a perspective view of a biliary stent in accordance with a preferred embodiment of the present utility model disclosed in example 2.

Reference numerals illustrate:

biliary stent 10, first wire 11, first cylindrical mesh structure 111, second wire 12, second cylindrical mesh structure 121, self-locking structure 13, non-self-locking structure 14; the biliary tract stent manufacturing clamp 20, a pin 21, a clamp main body 22, a positioning hole 23 and a groove 24; a developing ring 30.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to specific embodiments of the present utility model and corresponding drawings. In the description of the present utility model, it should be noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.

In the description of the present utility model, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Implementation of the embodimentsExample 1

In the prior art, biliary tract stents are manufactured based on jigs, which are generally cylindrical in structure, and when manufacturing biliary tract stents using jigs of this structure, wires are cross-woven at pins and the wires are closely attached to the surface of the jigs, so that the stress of the wires at the intersections is large, and thus the wires are easily broken.

Referring to fig. 1 to 8, in order to solve the above-mentioned problems, in the present embodiment, a novel biliary tract stent manufacturing jig 20 is provided, which includes a jig main body 22 and a plurality of pins 21 provided on the jig main body 22, the jig main body 22 is provided with a plurality of positioning holes 23 on its surface, and the pins 21 can be arranged in the positioning holes 23 in a certain pattern and detachably connected with the positioning holes 23.

In a preferred embodiment, the clamp body 22 is made of a metal material, and the clamp body 22 may be configured in a long cylindrical shape, and more preferably, the clamp body 22 has a variable diameter structure, as shown in fig. 5, whose diameter is gradually increased from the middle to both ends, so that the biliary tract stent 10 manufactured based on the structure also has the same variable diameter structure as the clamp body 22, and when the manufactured biliary tract stent 10 is implanted into a human body, since both ends thereof are enlarged, the positioning ability of the biliary tract stent 10 in the biliary tract of the human body can be enhanced, and since the diameter of the middle of the biliary tract stent 10 is slightly thinner, a better bending property can be provided to improve the structural fit of the biliary tract stent 10.

In a preferred embodiment, positioning holes 23 are provided in the surface of the jig main body 22, the positioning holes 23 being provided along the circumferential direction and the length direction of the jig main body 22, respectively, for detachable connection with the pins 21; preferably, the positioning hole 23 may be provided in a screw hole structure having a screw thread provided therein, and the pin 21 is provided with an external screw thread at a connection end thereof, and the positioning hole 23 is screw-coupled with the pin 21.

Preferably, the positioning holes 23 are provided at all points where the circumferential dividing line and the length dividing line of the jig main body 22 intersect, such that all the positioning holes 23 are arranged in a matrix; specifically, the distance between the circumferential dividing line and the length dividing line can be freely set according to actual requirements, and will not be described herein.

Preferably, although the positioning holes 23 are arranged in a matrix, not all of the positioning holes 23 are connected with the pins 21; in a preferred embodiment, the pins 21 are arranged in rows adjacent or spaced along the circumference of the clamp body 22, and the pins 21 of different rows are of the same or different numbers and the pins 21 of different columns are of the same or different numbers, arranged in columns adjacent or spaced along the length of the clamp body 22.

In a preferred embodiment, pins 21 are provided in all rows of locating holes 23 on the clamp body 22; in another preferred embodiment, the pins 21 are all provided in the positioning holes 23 of the upper row of the jig main body 22, and the pins 21 of the other rows are provided with one positioning hole 23 at intervals, as shown in fig. 5; in some alternative embodiments, pins 21 of each row on the clamp body 22 are disposed at least one location hole 23 apart.

In a preferred embodiment, pins 21 are provided in all columns of locating holes 23 in the clamp body 22; in another preferred embodiment, the pins 21 are all provided in the positioning holes 23 of the upper part of the column of the jig main body 22, and the pins 21 of the other columns are provided with at least one positioning hole 23 being spaced apart.

Preferably, the number of the positioning holes 23 may correspond to the number of the pins 21 one by one, but the positioning holes 23 are not all provided at all points where the circumferential dividing line and the length dividing line of the jig main body 22 intersect, but the positioning holes 23 are provided only at points where part of the dividing lines intersect, and then the pins 21 are provided in the positioning holes 23.

In a preferred embodiment, positioning holes 23 are formed at intersecting points of parting lines at both ends of the jig main body 22, and a pin 21 is provided in each positioning hole 23; among the parting line crossing points at other positions of the jig main body 22, the positioning holes 23 are provided at intervals in the circumferential direction, that is, one pin 21 is provided at every other parting line crossing point.

In a preferred embodiment, the pins 21 are arranged in rows along the circumferential direction of the clamp body 22, and in columns along the length direction of the clamp body 22; the pins 21 of different rows have the same or different numbers, and the pins 21 of different columns have the same or different numbers.

Preferably, grooves 24 are formed around at least part of the pins 21, the width of the grooves 24 is not smaller than the diameter of the wire knitted by the biliary stent 10, the wire can be crossly knitted at the grooves 24, due to the grooves 24, the bottom of the wire after crossly knitting is suspended, and the suspension provided by the grooves 24 can buffer the crossing of the wire to reduce stress and avoid breakage of the wire at the crossing due to folding.

In a preferred embodiment, the clamp body 22 is provided with an annular groove 24 around each pin 21, and the width of the groove 24 is greater than the diameter of the braided wire, as shown in fig. 6; in other preferred embodiments, the grooves 24 are configured as rings around a single pin 21, but not the outer circumference of each pin 21 is provided with grooves 24, or only a portion of the outer circumference of the pins 21 on the row/column is provided with grooves 24.

Preferably, each row of pins 21 on the clamp body 22 corresponds to a groove 24, and the grooves 24 are also configured in a ring shape, as shown in fig. 2 and 3; in other preferred embodiments, annular grooves 24 are provided on only a portion of the rows, while other rows are not provided; alternatively, the grooves 24 are spaced apart in different rows.

Preferably, each column on the clamp body 22 corresponds to a groove 24, the grooves 24 being configured as elongated slots, as shown in fig. 7; in other preferred embodiments, grooves 24 are provided on only a portion of the columns, while other columns are not provided; alternatively, the grooves 24 are spaced apart on different columns.

In some other preferred embodiments, the outer periphery of each row of adjacent pins 21 is provided with grooves 24, the grooves 24 being configured in an arc shape, as shown in fig. 8; alternatively, the outer circumferences of the adjacent pins 21 of each column are provided with grooves 24, and the grooves 24 are configured in a long groove shape at this time.

In the present embodiment, no matter what shape the groove 24 is set to, the wire can have smaller stress when crossing here, so that the wire is not easy to break during the knitting process.

In a preferred embodiment, the pins 21 disposed at different positions on the clamp body 22 have different sizes, and the larger the size of the pins 21, the larger the pores that the wires can form when crossing can ensure that the wires can move relatively when the final biliary stent is implanted into a human body and bent, so that the axial stretching of the wires is avoided, and the deformation of the wires is reduced, thereby reducing the tendency of the biliary stent to recover.

Preferably, different rows of pins 21 may be configured with the same or different dimensions, and different columns of pins 21 may be configured with the same or different dimensions.

Preferably, the pins 21 in the same row may be configured to be the same or different sizes, and the pins 21 in the same column may be configured to be the same or different sizes.

Example 2

In the present embodiment, a novel biliary tract stent manufacturing method is provided, which is manufactured based on the biliary tract manufacturing jig 20 in the above embodiment 1 to overcome the problem of poor fitting of the biliary tract stent in the prior art.

Referring to fig. 9, in the prior art, when a biliary stent is manufactured, a first wire is used to manufacture a first cylindrical mesh structure, a second wire is used to manufacture a second cylindrical mesh structure, and each of the first cylindrical mesh structure and the second cylindrical mesh structure includes a plurality of mesh structures arranged in sequence in the circumferential direction; the production process of the whole biliary tract stent comprises the following steps: after the first wire is wound on the biliary tract stent to manufacture the clamp and finally form a first cylindrical net structure, the second wire is moved and woven to form a second cylindrical net structure, in the whole biliary tract stent structure, a plurality of first cylindrical net structures are axially arranged, a plurality of second cylindrical net structures are also axially arranged, the first wire or the second wire between axially adjacent net structures commonly use the pin of the same biliary tract stent manufacturing clamp, and when the biliary tract stent is wound around the pin in a bending way, the pin is wound in the following way: the wires all pass through the same side of the pin and are fixed in a crossed manner to form a self-locking structure 13. The self-locking structure 13 can be relatively stable after the biliary tract stent is heat-set, when the biliary tract stent is implanted into a human body, the self-locking structure 13 can be relatively displaced, particularly at the outer radius of the biliary tract stent 10, the bending is generated by the stretching deformation of the wire rod, and the wire rod has large recovery trend and poor stent fitting property due to large wire rod deformation.

In a preferred embodiment, the biliary stent 10 is manufactured by winding a wire around the biliary stent manufacturing jig 20 and finally heat-setting the biliary stent 10, as shown in fig. 16. Preferably, the biliary stent fabrication jig 20 has a substantially long cylindrical shape, a plurality of detachable pins 21 are disposed on the biliary stent fabrication jig 20, and the pins 21 are detachable from the biliary stent fabrication jig 20 after the biliary stent 10 is woven and set so as to facilitate detachment of the biliary stent 10 from the biliary stent fabrication jig 20; preferably, the two ends of the biliary tract stent manufacturing fixture 20 are in a horn shape which is approximately outwards bulged, so that the two axial ends of the finally shaped biliary tract stent 10 are also provided with horn-shaped structures, which is beneficial to the positioning of the biliary tract stent 10 in the biliary tract of a human body so as to overcome the undesired sliding of the biliary tract stent.

In a preferred embodiment, the pins 21 are arranged along the circumferential direction and the length direction of the biliary stent fabrication jig 20, respectively, as shown in fig. 10; alternatively, the pins 21 may be distributed on the outer surface of the biliary stent fabrication jig 20 on average, on uneven or in a pattern, and in this embodiment, the pins 21 are provided at points where the circumferential parting line and the length parting line of the biliary stent fabrication jig 20 partially intersect, specifically: 7 rows of pins 21 are provided in the longitudinal direction of the biliary tract stent manufacturing jig 20, x1 to x7 respectively, and 10 rows of pins 21 are provided in the circumferential direction of the biliary tract stent manufacturing jig 20, y1 to y10 respectively; wherein, the pins 21 on x2 to x6 are arranged at intervals, only 5 pins are arranged, and the pins 21 on x1 and x7 are arranged continuously, and 10 pins are arranged, which is consistent with the number of rows of the pins 21 arranged in the circumferential direction. It will be appreciated by those skilled in the art that in the present embodiment, the arrangement of the pins 21 is merely an example, and the specific arrangement and number of the pins 21 may be changed according to actual needs in the actual arrangement.

Preferably, in the present embodiment, the wire used for manufacturing the biliary tract stent 10 is a metal wire, and specifically, a metal material having shape memory characteristics such as nickel-titanium alloy may be selected, and after the biliary tract stent 10 is manufactured, the material may be heat-set, and may be compressed at a low temperature, and after implantation in a human body, the material may be automatically expanded to a predetermined shape at the time of manufacturing along with an increase in temperature.

Preferably, in the present embodiment, the wires used for manufacturing the biliary tract stent 10 include a first wire 11 and a second wire 12, which are made of the same material and diameter, so as to ensure uniformity of strength of the biliary tract stent 10. In other preferred embodiments, wires of different materials and different diameters may also be selected. It will be appreciated by those skilled in the art that when wires of different materials and different diameters are selected, the two wires may have the same strength or may have different strengths.

In a preferred embodiment, fig. 11a to 11d illustrate a method of manufacturing the biliary stent 10 according to an example of the present utility model using the biliary stent manufacturing jig 20, in which solid lines represent the moving paths of the first wire 11 and/or the second wire 12, and hollow dots represent the planar arrangement of the pins 21 on the biliary stent manufacturing jig 20 in a preferred embodiment; in order to distinguish the structures formed by the first wire 11 and the second wire 12, respectively, in fig. 12a to 12d, the structures formed by the second wire 12 are represented by slightly thinner lines, and it should be understood by those skilled in the art that the thickness of the solid line in the figures is only a portion arbitrarily set for convenience of explanation, and the thickness of the solid line is substantially independent of the properties or dimensions of the wires in the present embodiment.

In the present embodiment, after the first wire 11 starts to move and weave, the second wire 12 can start to move and weave, without waiting for the second wire 12 to start to weave again after the first wire 11 finishes completely weaving; alternatively, after the second wire 12 starts knitting, the knitting of the first wire 11 may be started; alternatively, the first wire 11 and the second wire 12 start knitting at the same time; for convenience of explanation, the knitting process of the first wire 11 and the second wire 12 will be described, respectively; it should be noted that, the "first" and "second" are only names manually set for convenience of distinguishing and describing two wires, and the two do not include causal relationships or other necessarily logical relationships.

In a preferred embodiment, the method of manufacturing the biliary stent 10 includes the steps of:

the first wire 11 is moved in the circumferential direction from the first starting point by using any one of the pins 21 at one end of the biliary tract stent manufacturing jig 20 as the first starting point, and is wound in a zigzag shape with the pins 21 as the supporting points, thereby forming a first cylindrical mesh structure 111.

Preferably, the pin 21 at (x 1, y 1) is set as a first starting point, and the first wire 11 is woven along the pin 21 on the surface of the biliary tract stent manufacturing jig 20 in a bent shape of peaks and valleys; preferably, the first wire 11 is moved with one pin 21 spaced apart in the longitudinal direction and adjacent pins 21 are directly connected in the circumferential direction, but since the pins 21 on x2 to x6 are spaced apart, the first wire 11 is moved with actually one intersection of the circumferential dividing line and the longitudinal dividing line, that is, the first wire 11 is moved with one intersection of the circumferential dividing line and the longitudinal dividing line spaced apart in both the circumferential direction and the longitudinal direction.

Preferably, the moving track of the first wire 11 passes through the pins 21 (x 1, y 1), (x 3, y 3), (x 1, y 5), (x 3, y 7), (x 1, y 9), (x 3, y 1), when the first wire 11 walks as above, a zigzag structure is formed at this time, and then knitting is continued, the moving track of which passes through the pins 21 (x 3, y 1), (x 1, y 3), (x 3, y 5), (x 1, y 7), (x 3, y 9), (x 1, y 1), (x 3, y 3), and when the first wire 11 moves to the pins 21 (x 1, y 1) again, the knitting of the first cylindrical mesh structure 111 of the first wire 11 is completed.

Preferably, the first cylindrical mesh structure 111 includes a plurality of mesh structures arranged in sequence in a circumferential direction, the mesh structures have a substantially diamond shape, and vertexes of adjacent mesh structures are opposite.

Preferably, after the knitting of the first cylindrical mesh structure 111 is completed, the first wires 11 are again moved from (x 1, y 1) to (x 3, y 3) in order to fix the first wires 11 overlapped with each other on the moving path, and thus the again passed first wires 11 are helically twisted from the pins 21 (x 1, y 1) around the first passed first wires 11 to (x 3, y 3) to complete the mutual fixation of the twice overlapped moving trajectories of the first wires 11.

Preferably, the first wire 11 is moved straight after reaching (x 3, y 3) again and continues to be zigzag wound at least at intervals (x 3, y 3) to form the second first cylindrical mesh 111, and the point is regarded as the first transition point, that is, the first adjacent pin 21 through which the first wire 11 passes again from the first start point along the original moving path, since the start point of the second first cylindrical mesh 111 can be regarded as (x 3, y 3) and the point also belongs to the end point of the first cylindrical mesh 111.

Preferably, the movement track of the second first cylindrical mesh structure 111 is (x 3, y 3), (x 5, y 5), (x 3, y 7), (x 5, y 9), (x 3, y 1), (x 5, y 3), (x 3, y 5), (x 5, y 7), (x 3, y 9), (x 5, y 1), (x 3, y 3), (x 5, y 5), and is the same as the first cylindrical mesh structure 111 in that the movement track is still spaced apart from the intersection point of the circumferential dividing line and the length dividing line in both the circumferential direction and the length direction during the braiding of the second cylindrical mesh structure.

Preferably, after the knitting of the second first cylindrical mesh structure 111 is completed, the first wire 11 is fixed by spirally twisting the first wire 11 passing first when moving from (x 3, y 3) to (x 5, y 5) again, and at this time (x 5, y 5) is used as a second transition point, which is the first adjacent pin 21 through which the first wire 11 passes again along the original moving path by the first transition point.

The knitting of the third first cylindrical mesh structure 111 is performed in the same manner, and the movement locus of the third first cylindrical mesh structure 111 is (x 5, y 5), (x 7, y 7), (x 5, y 9), (x 7, y 1), (x 5, y 3), (x 7, y 5), (x 5, y 7), (x 7, y 9), (x 5, y 1), (x 7, y 3), (x 5, y 5), (x 7, y 7), and the movement locus is still at the intersection of one circumferential dividing line and one length dividing line in both circumferential direction and length direction during the knitting of the third cylindrical mesh structure, as in the above-described first and second first cylindrical mesh structures 111.

Preferably, after the knitting of the third first cylindrical mesh structure 111 is completed, the first wire 11 is fixed by spirally twisting the first wire 11 passing first when moving from (x 5, y 5) to (x 7, y 7) again. To this end, the first cylindrical mesh structure 111 has entirely covered the biliary stent fabrication jig 20 in the axial direction; it will be appreciated by those skilled in the art that since the number or the number of rows of pins 21 on the biliary stent fabrication jig 20 is not limited to the number provided in the present embodiment, when the number of pins 21 increases, the above steps are repeated so that a plurality of first cylindrical mesh structures 111 are axially disposed in order until one end of the biliary stent fabrication jig 20 extends to the other end.

Preferably, since each first cylindrical mesh structure 111 comprises several mesh structures arranged circumferentially, in a preferred embodiment the mesh structures in the first cylindrical mesh structure 111 may be defined as first mesh structures. The peaks of the first cylindrical mesh structures 111 adjacent to each other are opposite, and share a pin 21, such as (x 3, y 1), (x 3, y 3), (x 3, y 5), (x 3, y 7), (x 3, y 9), and (x 5, y 1), (x 5, y 3), (x 5, y 5), (x 5, y 7), (x 5, y 9), through which the first wire 11 passes twice in succession, respectively, each time the current trajectory of the first cylindrical mesh structure 111 is woven; in a preferred embodiment, taking (x 3, y 7) as an example, the first wire 11 is woven to trace the first cylindrical mesh 111 when passing through for the first time, and the second wire is woven to trace the second cylindrical mesh 111 when passing through for the second time; preferably, the first wire 11 crosses the first wire 11 woven for the first time at the second pass through the point and is looped from the other side of the pin 21 at the point (i.e., the opposite side of the first wire 11 from the first looped side), crosses the first wire 11 again and is secured, forming the first wire 11 interdigitated but non-self locking structure 14, as shown in fig. 15. It will be appreciated by those skilled in the art that when the first wire 11 passes through the point a second time and crosses over the first wire 11 woven for the first time and is looped from the same side of the point, it is abutted against, crosses over and is secured to the first wire 11 in such a way that the self-locking structure 13 is formed.

In a preferred embodiment, the first wires 11 are mutually crossed but not self-locking structures at the opposite positions of the peaks of all the first cylindrical net structures 111 adjacent to each other, when the biliary stent 10 is manufactured and the pin 21 is pulled out, a relatively movable space exists at the positions of the first cylindrical net structures 111 and the non-self-locking structures 14, when the biliary stent 10 is stressed to bend, the relative movement between the different first cylindrical net structures 111 is reduced, and the space in the non-self-locking structures 14 is not reduced, rather than the stretching deformation of the first wires 11, so that the biliary stent 10 has smaller trend force for restoring the shape and high fitting degree with the biliary structure, and a patient is more comfortable.

Preferably, after the first wire 11 finishes braiding one or more first cylindrical net structures 111, a developing ring 30 is sleeved at the spiral twisting position where the final track is overlapped, preferably, the developing ring 30 is in a spiral cylinder shape with smaller pitch, when the developing ring 30 is placed, the developing ring 30 can be moved to a non-spiral twisting position, after the first wire 11 finishes spiral twisting at the track overlapping position, the developing ring 30 is moved to the spiral twisting position and sleeved outside the spiral twisting position, and the developing ring is used for developing a medical imaging system and fixing the first wire 11 at the track overlapping position. Preferably, the developing ring 30 is provided at a position where the knitting of the first wire 11 is finished to restrain the first wire 11 from tilting an end portion thereof.

In a more preferred embodiment, a developing ring 30 is sleeved at each position where the trajectories of the first wires 11 overlap, so that each overlapping region of the helically twisted first wires 11 can be relatively fixed and a developing site is provided.

Preferably, after the first wire 11 starts to weave, or simultaneously with the weaving, the second wire 12 starts to move and weave, and since the first wire 11 substantially includes the intersection point of one circumferential dividing line and a length dividing line in each mesh structure when weaving the first cylindrical mesh structure 111, the gap is relatively large, and the second wire 12 is used to reduce the gaps of the mesh structures formed by the first cylindrical mesh structure 111.

Preferably, the second wire 12 is used to weave the second cylindrical mesh structure 121, the second cylindrical mesh structure 121 intersects with the trajectory of the first cylindrical mesh structure 111, and an insertion design is performed at the intersection, ensuring that the final biliary stent 10 forms a stable structure in a single mesh structure.

It will be understood by those skilled in the art that a first cylindrical mesh 111 refers to a cylindrical unit woven from first wire 11, and a second circular mesh refers to a cylindrical unit woven from second wire 12; the first cylindrical mesh structure 111 and the second cylindrical mesh structure 121 are provided in plurality and are sequentially arranged along the length direction of the biliary tract stent manufacturing jig 20, and are finally covered from one end to the other end of the biliary tract stent manufacturing jig 20.

Preferably, any pin 21 at one end of the biliary stent manufacturing jig 20, which is not on the first cylindrical mesh structure 111, is used as a second starting point, the second wire 12 is moved from the second starting point in the circumferential direction, and is bent and wound in a zigzag shape with the pin 21 not on the first cylindrical mesh structure 111 as a fulcrum, forming a second cylindrical mesh structure 121; preferably, the second cylindrical mesh structure 121 is trajectory-intersected with the first cylindrical mesh structure 111 and sequentially disposed along the axial direction of the biliary stent fabrication jig 20 until extending to the other end of the biliary stent fabrication jig 20.

Preferably, the pin 21 at (x 1, y 6) is set as a second starting point, and the second wire 12 is woven along the pin 21 on the surface of the biliary stent manufacturing jig 20 in a bent shape of peaks and valleys; preferably, the second wires 12 directly connect adjacent pins 21 when knitting the first second cylindrical mesh structure 121 without further spacing the intersection of one circumferential parting line with a length parting line, in order to reduce the mesh size of the first cylindrical mesh structure 111.

Preferably, the movement track of the second wire 12 passes through pins 21 (x 1, y 6), (x 2, y 7), (x 1, y 8), (x 2, y 9), (x 1, y 10), (x 2, y 1), (x 1, y 2), (x 2, y 3), (x 1, y 4), (x 2, y 5), (x 2, y 7), when the second wire 12 walks along the path described above, a first second cylindrical mesh structure 121 is formed, and the first second cylindrical mesh structure 121 has a zigzag structure extending circumferentially.

Preferably, after the knitting of the first second cylindrical mesh structure 121 is completed, the second wires 12 are again moved from (x 1, y 6) to (x 2, y 7) in order to fix the second wires 12 overlapped with each other on the moving path, and thus the second wires 12 passed again are helically twisted from the pins 21 (x 1, y 6) around the first-passing second wires 12 to (x 2, y 7) to complete the mutual fixation of the two overlapping moving trajectories of the second wires 12.

Preferably, the movement track of the second cylindrical mesh structure 121 is (x 2, y 7), (x 4, y 9), (x 2, y 1), (x 4, y 3), (x 2, y 5), (x 4, y 7), (x 2, y 9), (x 4, y 1), (x 2, y 3), (x 4, y 5), (x 2, y 7), (x 4, y 9), unlike the first second cylindrical mesh structure 121, the movement track is spaced apart from the intersection of the circumferential parting line and the length parting line in both the circumferential direction and the length direction during the braiding of the second cylindrical mesh structure.

Preferably, the second cylindrical mesh structure 121 includes a plurality of mesh structures arranged in sequence in the circumferential direction, the mesh structures having a substantially diamond shape, and the vertices of adjacent mesh structures being opposite. In a preferred embodiment, the mesh structure woven from the second wires 12 may be defined as a second mesh structure.

As with the first second cylindrical mesh structure 121, the second wire 12 is spirally wound around the first-passing second wire 12 upon passing (x 2, y 7), (x 4, y 9) again to complete mutual fixation of the two overlapping movement trajectories of the second wire 12.

Preferably, the movement track of the third second cylindrical mesh structure 121 is (x 4, y 9), (x 6, y 1), (x 4, y 3), (x 6, y 5), (x 4, y 7), (x 6, y 9), (x 4, y 1), (x 6, y 3), (x 4, y 5), (x 6, y 7), (x 4, y 9), (x 6, y 1), and the knitting manner is the same as that of the second cylindrical mesh structure 121, and will not be repeated herein; preferably, the second wire 12 is spirally wound around the first passing second wire 12 at the time of the second pass (x 4, y 9), (x 6, y 1).

The movement track of the second wire 12 is (x 6, y 1), (x 7, y 2), (x 6, y 3), (x 7, y 4), (x 6, y 5), (x 7, y 6), (x 6, y 7), (x 7, y 8), (x 6, y 9), (x 7, y 10), (x 6, y 1), (x 7, y 2) when the last second cylindrical mesh structure 121 is woven, and the second wire 12 is spirally wound around the first-passing second wire 12 when passing (x 6, y 1), (x 7, y 2) again; preferably, the last second cylindrical mesh structure 121 is identical in structure to the first second cylindrical mesh structure 121, and also has a zigzag structure extending circumferentially, so far as the entire biliary stent 10 is knitted, as shown in fig. 13.

Preferably, after the second wire 12 finishes knitting one or more second cylindrical mesh structures 121, a developing ring 30 is further sleeved at the spiral twist where the final track overlaps, and the arrangement of the developing ring 30 is the same as that of the developing ring 30 arranged in the first cylindrical mesh structure 111, which is not described herein.

In a more preferred embodiment, a developing ring 30 is sleeved at each position where the trajectories of the second wires 12 overlap, so that each overlapping region of the helically twisted second wires 12 can be relatively fixed and a developing site is provided.

Preferably, the first and last second cylindrical meshes 121 are in a zigzag structure extending circumferentially, while the second and third second cylindrical meshes 121 are in a mesh structure arranged circumferentially, the vertices of axially upper and lower adjacent second cylindrical meshes 121 are opposite and share a pin 21, such as (x 2, y 1), (x 2, y 3), (x 2, y 5), (x 2, y 7), (x 2, y 9), (x 4, y 1), (x 4, y 3), (x 4, y 5), (x 4, y 7), (x 4, y 9), (x 6, y 1), (x 6, y 3), (x 6, y 5), (x 6, y 7), (x 6, y 9), and the second wire 12 passes through these points twice in sequence, respectively; in a preferred embodiment, taking (x 4, y 3) as an example, the second wire 12 is first threaded to weave a second cylindrical mesh 121 and is second threaded to weave a third second cylindrical mesh 121; preferably, the second wire 12 crosses over the first braided second wire 12a second time past the point and loops around from the other side of the pin 21 at the point (i.e., the opposite side of the first loop of the second wire 12), crosses over again the second wire 12 and is secured, forming a second wire 12 interdigitated but non-self locking structure 14.

In a preferred embodiment, the second wires 12 are interdigitated but non-self locking structures 14 at all opposite vertices of the second cylindrical mesh structure 121 adjacent one another. The non-self-locking structure 14 of the second wire 12 is the same as the non-self-locking structure 14 of the first wire 11, and will not be described here.

Preferably, the dimensions of each non-self-locking structure 14 in each first cylindrical mesh structure 111 may be the same or different; the dimensions of each non-self-locking structure 14 in each second cylindrical mesh structure 121 may be the same or different; the non-self-locking structures 14 in the first cylindrical mesh 111 may or may not be the same size as the non-self-locking structures 14 in the second cylindrical mesh 121.

In a preferred embodiment, the size of the non-self-locking structure 14 may be determined by the size of the pin 21, the larger the space in the non-self-locking structure 14; in another preferred embodiment, a plurality of closely spaced pins 21 may be provided at the non-self-locking structure 14, where the larger the number of pins 21, the larger the size of the non-self-locking structure 14.

In a preferred embodiment, since the first wire 11 and the second wire 12 may be woven at the same time, it is no longer defined which wire of the first cylindrical mesh structure 111 and the second cylindrical mesh structure 121 is located above at the locus intersection in the entire biliary stent 10.

In this embodiment, the opposite positions of the vertexes of the adjacent first cylindrical mesh structures 111 and the opposite positions of the vertexes of the adjacent second cylindrical mesh structures 121 are respectively provided with a non-self-locking structure 14, so that when the biliary stent 10 is axially stretched within a certain range, the opposite movements between the different cylindrical mesh structures will occur first, and the deformation of the wire is reduced, thereby reducing the restoring trend thereof. The deformation of the wire is only entirely induced when the space within the non-self locking structure 14 is squeezed to completely disappear. Such a property allows the biliary stent 10 to reduce the deformation of the wire by reducing the space in the non-self-locking structure 14 in a state where the outer radius of curvature is stretched when the biliary stent 10 is curved in the biliary tract, thereby reducing the tendency of the biliary stent 10 to return to its original shape. The fitting degree of the biliary stent 10 to the human body cavity is improved, and the possibility that the biliary stent 10 brings abnormal feeling to the patient at the bending part of the cavity is reduced.

Example 3

The present embodiment provides a manufacturing method of the biliary tract stent 10, which is different from that of the above-described embodiment 2 mainly in that the wire knitting method of the axially adjacent first cylindrical mesh structure 111 at the opposite vertex and the adjacent second cylindrical mesh structure 121 at the opposite vertex, other technical features already included in embodiment 1 are naturally inherited in the present embodiment.

In a preferred embodiment, the first wire 11 and/or the second wire 12 cross each other but are not self-locking at the pin 21 in the middle of the biliary stent fabrication jig 20, and cross each other and are self-locking at the pins 21 near both ends of the biliary stent fabrication jig 20; referring to fig. 14, since the first wire 11 does not have the condition of forming the self-locking structure 13 at both ends of the biliary tract stent manufacturing jig 20, the first wire 11 is provided with the non-self-locking structure 14 in the second and third first cylindrical net structures 111 thereof, and when the number of rows of pins 21 increases in the length direction, it is expected that the self-locking structure 13 is still provided at a position near both ends of the biliary tract stent manufacturing jig 20 and the non-self-locking structure 14 is provided at the pin 21 near the middle position of the biliary tract stent manufacturing jig 20; preferably, since the second wire 12 does not have the condition of forming the self-locking structure 13 at both ends of the biliary stent fabrication jig 20 and all the pins 21 in the x2 row and the x6 row are close to both ends, the second wire 12 is not provided with the non-self-locking structure 14 in all the pins 21 in the x1, x2, x6, x7 rows, and the non-self-locking structure 14 is provided only in all the pins 21 in the x4 row in the middle of the biliary stent fabrication jig 20, that is, only in the opposite positions of the apexes of the second and third second cylindrical net structures 121, it is expected that the number of rows in which the non-self-locking structure 14 can be provided in the middle of the biliary stent fabrication jig 20 increases as the number of rows of the pins 21 increases in the length direction.

It will be appreciated by those skilled in the art that the above arrangement is only for the number of rows of pins 21 in the y-direction of the biliary stent manufacturing jig 20 shown in the drawings, and when the number of rows increases, the number of non-self-locking structures 14 and/or self-locking structures 13 may be correspondingly increased, but the overall arrangement concept is still: the non-self-locking structures 14 are arranged or not arranged at two ends close to the biliary tract stent 10, the self-locking structures 13 are arranged or arranged in a plurality of ways, the non-self-locking structures 14 are arranged or arranged in a plurality of ways in the middle close to the biliary tract stent 10, and the self-locking structures 13 are not arranged or arranged in a plurality of ways.

Since the two ends of the biliary tract stent 10 are always bell-mouthed for positioning after being implanted into a human body, the self-locking structure 13 can further strengthen the trend force of the biliary tract stent 10 for restoring the original shape, so as to enhance the positioning capability of the biliary tract stent 10 in the biliary tract of the human body, and the bending of the biliary tract stent 10 is always generated in the middle part thereof, so that the non-self-locking structure 14 is still arranged in the middle part thereof, thereby improving the structural fitting degree of the stent.

In another preferred embodiment, the biliary stent 10 is provided with little or no self-locking structure 13 at both ends thereof, is provided with no or more self-locking structures 14, is provided with more or less self-locking structures 13 in the middle portion near the biliary stent 10, is provided with no or more self-locking structures 14; alternatively, in another preferred embodiment, the first wire 11 is provided with a non-self-locking structure 14 opposite the vertices of all the first cylindrical units, and the second wire 12 is provided with a self-locking structure 13 opposite the vertices of all the second cylindrical units; alternatively, in another preferred embodiment, the first wire 11 is provided with a self-locking structure 13 opposite the vertices of all the first cylindrical units, and the second wire 12 is provided with a non-self-locking structure 14 opposite the vertices of all the second cylindrical units; alternatively, the first wires 11 and/or the second wires 12 are alternately arranged around the pins 21 with self-locking and non-self-locking between the pins 21 with opposite apexes of adjacent rows.

All four designs are applicable to patients with certain biliary tract specific lesions to provide the biliary tract stent 10 with a better fit for the specific type of lesion.

The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.

Claims

1. The biliary tract stent manufacturing clamp is characterized by comprising a clamp main body, wherein a plurality of pins are arranged in the circumferential direction and the length direction of the clamp main body, and the pins are detachably connected with the clamp main body;

the pins are arranged in rows along the circumferential direction of the clamp body and in columns along the length direction; the pins of different rows have the same or different numbers, and the pins of different columns have the same or different numbers; the pins of different rows have the same or different dimensions and the pins of different columns have the same or different dimensions; the pins in the same row have the same or different dimensions and the pins in the same column have the same or different dimensions;

the clamp body is provided with grooves around at least part of the pins, the width of the grooves is not smaller than the diameter of the braided wires of the biliary tract stent, and the grooves are used for reducing the stress when the wires cross.

2. The biliary stent fabrication jig of claim 1, wherein the groove is disposed around the pin, the groove configured as a circular ring.

3. The biliary stent fabrication jig of claim 1, wherein the grooves are disposed along the pin array, the grooves configured as elongated slots.

4. The biliary stent fabrication jig of claim 1, wherein the grooves are disposed along the row of pins, the grooves being configured in a circular shape.

5. The biliary stent manufacturing jig of claim 1, wherein the outer circumferences of the adjacent ones of the pins of each row are provided with the grooves, the grooves are configured in an arc shape, and/or the outer circumferences of the adjacent ones of the pins of each column are provided with the grooves, the grooves are configured in a long groove shape.

6. The biliary tract stent manufacturing clamp according to claim 1, wherein the clamp body is provided with a plurality of positioning holes, the outer contour of the positioning holes is matched with the outer contour of the pin, and the positioning holes and the pin can be detachably connected;

the number of the positioning holes is not less than the number of the pins.

7. The biliary tract stent manufacturing jig of claim 6 wherein said positioning holes are arranged in a matrix on said jig body, said pins being disposed in said positioning holes at intervals or adjacently.

8. The biliary tract stent manufacturing jig of claim 1 wherein said jig body is long cylindrical; the clamp body is provided with a reducing structure, and the diameter of the clamp body gradually increases from the middle part to the two sides.