JP2900988B2 - Wire bending equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire bending device, and more particularly, to a wire bending device constituting a stent inserted into a blood vessel.

[0002]

2. Description of the Related Art Conventionally, there is known a technique of inserting a cylindrical stent into a blood vessel of a human body to expand a blood vessel having a narrow flow path. The stent is composed of a stainless steel wire and a thread that are bent in a sawtooth shape as a whole, and the thread is sequentially inserted through small annular locking portions provided at each of the V-shaped folded portions of the wire, the entire wire you are to form a cylindrical shape.

[0003]

By the way, conventionally,
The above-described wire bending operation has been performed manually. Therefore, in the related art, there is a drawback in that it takes a long time to bend the wire rod, and the dimensional accuracy of each part after being bent and formed is poor. this
In view of such circumstances, the present invention relates to a process for manufacturing a stent.
Wire bending device that can mechanically process the part
Is provided.

[0004]

That is, according to the present invention, semi-circular engaging portions which mutually engage with each other are formed at opposing positions, and are provided so as to be relatively movable in the X direction which is a direction of coming and coming from each other. A pair of first molding members, and semi-circular engagement portions that are arranged in parallel with the first molding members and engage with each other at mutually opposing positions, and are provided so as to be relatively movable in the X direction. and a pair of second forming member, protruded in a semicircular engaging portions opposite directions to each other and a semicircular engaging portion of the second forming shape member of the first mold member, and the first A semi-circular shape in which the first molding member and the second molding member are arranged at a distance in the Y direction orthogonal to the X direction, and the wire is sandwiched between the engagement portions of the molding members and protrudes in opposite directions. Is formed by providing a predetermined linear portion between the two.

[0005]

According to the present onset Akira [action], has been conventional manually processing half
It can be mechanically processed to molding operation of the circular engagement portion
You. Therefore, the dimensional accuracy of each part of the wire after the forming can be improved, and the time required for the wire forming operation can be shortened.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. In FIG. 7, reference numeral 1 denotes a cylindrical stent which is the same as a conventionally known stent. The stent 1 expands in diameter in its natural state due to its own elasticity. However, as shown in a cross-sectional view in FIG. 8, when the stent 1 is inserted into a blood vessel 2 of a human body, the diameter of the stent 1 is reduced. , After being inserted into the blood vessel 2
When placed in a required position, the flow path in that portion is expanded. Then, blood flows through the internal space of the stent 1 placed in the blood vessel 2 as described above. As shown in FIGS. 10 to 12, the stent 1 is made of a stainless steel thin wire 3 bent and formed into a saw-tooth shape, and sequentially inserted into each locking portion 3 a of the wire 3 to make the entire wire 3 into a cylindrical shape. And a thread 4 to be formed.

The stent 1 is manufactured by bending the wire 3.
Process, previously not a, as shown in FIG. 9, prepared stainless steel thin wire 3, to form a semicircular engaging portion 3a at predetermined intervals of the wire 3. Note that the adjacent locking portions 3a are
The bulging direction is formed so as to be sequentially reversed. Next, as shown in FIG. 10, the wire 3 is bent so that the locking portions 3a and the straight portions 3b and 3c before and after the locking portions 3a become V-shaped as a whole. It is formed so as to have a C-shape close to a substantially circular shape. Thereby, as shown in FIG. 12, the entire stainless steel wire 3 is bent in a sawtooth shape on the same plane. FIG.
As shown in FIG. 0, the wire 3 after the whole was formed into a sawtooth shape
The dimensions 3b and 3c of each linear portion are the same in the entire area of the wire 3 and, as shown in FIG. 13, the central portion of the entire wire 3 is the same as that of FIG. In some cases, the dimensions 3b and 3c are set to the same dimensions, and the dimensions 3b and 3c of each straight line portion on both ends in the longitudinal direction of the entire wire 3 are gradually reduced. Next, as shown in FIG. 11, each of the C-shaped engaging portions 3a and the straight portions 3
Since the portions that become the boundaries with b and 3c are in the state of being opposed to and closest to each other, they are soldered so as to be integrated with each other. As a result, each of the locking portions 3a having a C-shape is formed into a complete ring. In this way, the bending operation of the wire 3 and the locking portions 3a
Is completed.

Thereafter, the thread 4 is sequentially passed through the locking portion 3a on one end side of the entire wire 3 to the locking portion 3a located on the other end side (FIG. 11), and the linear portion 3b of the wire 3
The cylindrical stent 1 is completed as a whole by sequentially bending the 3c into an arc shape. The wire 1 formed as shown in FIG. 12 and formed into a cylindrical shape with a thread 4 is the stent 1 shown in FIG. 7, and is generally called a straight stent. On the other hand, as shown in FIG.
4 is a stent 1 shown in, which is generally that have been referred to as Spiral stent. In this embodiment, the bending process of the wire 3 shown in FIG. 9 is mechanically processed by the first bending device 5 according to the present invention shown in FIGS. 1 and 2, and the wire shown in FIG. The bending step 3 is mechanically processed by the second bending device 6 shown in FIGS.

(Structure of First Bending Device 5) That is, in FIGS. 1 and 2, the first bending device 5 includes a rectangular base 11 that is supported horizontally.
A guide member 12 is fixed on the base 11 by protruding in parallel with the Y direction. On the upper surface of the base 11, a first movable member 13 and a second movable member 14, each having a rectangular shape, are mounted. Engagement grooves 13a, 14a formed on the bottom surfaces of the movable members 13, 14 are provided by the guides. It is engaged with the member 12. Thereby, the movable members 13 and 14 can be moved on the base 11 along the Y direction. On the upper surface of the first movable member 13, a pair of left and right first molding members 15, 1
5 'is provided with, on the upper surface of the second movable member 14 Similarly, a pair of left and right third forming shape members 16, 16' are provided. Also on the upper surface of the base 11 to a position between the two movable members 13 and 14, further pair of second forming shape members 17,
17 'is provided. The two movable members 13 and 14 include:
Slots 13b and 14b are formed in parallel with the Y direction. Screws 18 and 18 are passed through the slots 13b and 14b and screwed into the screw holes of the base 11. Also, the base 11
A plate-like member 21 is connected to a left side portion of the plate-shaped member 21. Notches 21a and 21b are formed in the plate-like member 21 at positions facing the movable members 13 and 14, respectively. Screws 2 are inserted into these notches 21a and 21b.
2 and 22 are penetrated, and their ends are
The screw holes 3 and 14 are screwed into the screw holes. By tightening the screws 18 and 22, the two movable members 13 and
14 can be fixed at a required position in the Y direction on the base 11, and the movable members 13 and 14 can be moved in the Y direction on the base 11 by loosening the screws 18 and 22. The first molding member 15 is the first movable member 1
3, the first molded member 15 is formed with an h-shaped notch 15a. And this notch 15a
The first forming member 15 'having the same shape as the first forming member 15' is fitted and mounted on the first movable member 13, and the first forming member 15 'is orthogonal to the Y direction in the notch 15a. The relative movement can be performed only in the X direction. On the other hand, the third
Forming the shape member 16 is fixed at the second movable member 14, the third
The formed shape member 16 and forms a notch 16a Yoo shaped as a notch 15a and symmetrical first molding member 15. The notch 16a has the same shape as that of the notch 16a.
Third forming shape member 16 'fitted to Yes is placed on the second movable member 14, the third forming shape members 16' X in the notch 16a
Relative movement is possible only in the direction. On the upper surface of the first mold member 15 and the third forming shape member 16 located on the left side, Y direction parallel to the groove 15b, and 16b are formed on the same straight line. Formed in these grooves 15b, 16b are protrusions projecting rightward, and semi-circular engagement protrusions 15c, 16
c is formed. On the other hand, a formed portion protruding leftward is formed at an upper end of the first formed member 15 'and on the left side, and the formed portion is placed on the bottom of the groove 15b. A semicircular engaging recess 15a 'that engages with the engaging projection 15c is formed at the center of the tip of the molded portion. Similarly to this, at the upper side of the third forming shape members 16 ', and an end portion of the left side there as a molded portion projecting toward the left, placing the molded part at the bottom of the groove 16b And a semicircular engagement recess 16a 'that engages with the engagement protrusion 16c is formed at the center of the tip of the molded portion. Then, the engaging protrusion 15c at the opposing position and the engaging recess 1
The wire 3 is sandwiched between the engaging projections 5a 'and the engaging projections 16c and the engaging recesses 16a' to form the above-described semicircular locking portion 3a. The first molding member 15 'and the third forming shape members 16', notches 15a, X direction of the through hole 15d penetrating to the 16a, Yes and drilled 16d, the through-hole 15d, the rod 23 to 16d, 24 are slidably penetrated. One end of the rod 23 is rotatably connected to the first forming member 15 ′, and the outer periphery of the other end of the rod 23 is a thread. The other end of the rod 23 serving as the screw portion is screwed to one end of a pipe 26 linked to the handle 25. By rotating the rod 23 by the required amount in the normal and reverse directions, the stop position of the first forming member 15 'in the X direction in the notch 15a can be adjusted. One end of the rod 24 is Yes coupled rotatably to the third forming shape members 16 ', the other end outer periphery of the rod 24 is a threaded portion. The screw portion is screwed to one end of a pipe 28 linked to the handle 27. Thus, the rod 24 by a required amount by rotating the forward and reverse, it is possible to adjust the X-direction of the stop position of the third forming shape members 16 'in the notch 16a. The rods 23, 24
Lock nuts 29, 29 are screwed into the threaded portions of the pipe 2.
By contacting the ends of the rods 6 and 28, each rod 2
3 and 24 are fixed to the pipes 26 and 28, respectively. The pipe 26 is slidably penetrated through a through hole of a guide portion 13c provided in the first movable member 13, and a bifurcated connecting portion 25a of the handle 25 is attached to an end of the pipe 26 projecting outward. They are swingably connected. The connecting portion 25a of the handle 25 is substantially 9
A pair of links 31 are attached to the guide portion 13c so as to be bent by 0 degrees and to be bent at both sides. Similarly, the pipe 28 is slidably penetrated through a through hole of a guide portion 14c provided in the second movable member 14, and an end of the pipe 28 protruding outward is connected to a connecting portion 27a of the handle 27. Are swingably connected.
The connecting portion 27a of the handle 27 is bent approximately 90 degrees with respect to the upper main body, and a pair of links 3 extends over both sides of the bent portion and the guide portion 14c.
2 is installed. Then, as shown by the imaginary line in FIG. 2, in a state where the handle 25 (27) is turned sideways, the first molding member 15 ′ ( third
Forming shape member 16 ') is located on the most right side become retracted position within the notch 15a (16a). On the other hand, from the state shown by the imaginary line to the position shown by the solid line, the handle 25 (2
When 7) is raised to the limit position, the first molded member 15 '
(Third formed shape member 16 ') is advanced to the advanced position where the leftmost side put in cutout 15a (16a). At this time, the opposed engaging recesses 15a '(16a') and the engaging projections 15c (16c) engage with each other.
At this time, the engagement recesses 15a '(16a') and the engagement protrusions 1
5c (16c) and the engaging rod 15a '(16a') and the engaging protrusion 15c.
(16c) sandwiches the wire 3, and the portion is formed as a semicircular locking portion 3a. Next, the pair of first molding members 15, 15 'and the
3 second forming shaped member is provided between the forming shape members 16, 16 '1
7, 17 'will be described. Second forming shape members left side 1
Numeral 7 is fixed to the upper surface of the base 11, and a notch 17a in the Y direction which is open on the right side is provided on the upper surface. A formed portion extending toward the right side is formed in the notch 17a, and a semicircular engaging recess 17b is formed at the center of the tip of the formed portion. On the other hand, the second molding member 17 ′ on the right side is movably mounted on the upper surface of the base 11, and the engaging recess 17 b is provided on the upper surface on the left end thereof. A molded portion protruding toward the front end is formed. A semicircular engagement projection 1 that engages with the engagement recess 17b is provided at the tip of the molded portion.
'Yes form a engaging projection 17a' 7a molded part provided with is placed on the bottom of the notch 17a of the third forming shape member 17. Further, the end portion of the right side of the second forming shape members 17 ', are connected to rotatably rod 33. An outer peripheral portion on the right side of the rod 33 is a screw portion, and the screw portion is screwed to one end of the pipe 34. The pipe 34 is slidably penetrated through a through hole of a guide portion 11 a provided on the upper surface of the base 11. Second forming shape members 17 '
, In conjunction with the rod 33 and the pipe 34, and is movable only in the second forming shape member 17 and toward or away from (X direction). The end of the pipe 34 protruding outward from the through hole of the guide portion 11a is connected to the handle 25, 2 described above.
7 and is swingably connected to a connecting portion 35a of a handle 35 formed in the same manner as in FIG. Also, the handle 35 and the guide unit 1
3c, a pair of links 36 is attached. Therefore, when the defeated the handle 35 to the horizontal is, first
2 formed shape member 17 'is spaced apart from the second forming shape members 17 of the left side, engagement recess 17b and the engaging protrusion 17a' gap is formed between the. On the other hand, when the upright handle 35 to the limit position, the second formed shape member 17 'is moved to the left side,
The engaging recess 17b and the engaging projection 17a 'are designed to engage with each other. At this time, the engaging recess 17b and the engaging protrusion 17
If the wire 3 is interposed between the wire 3 and the wire a 3, the wire 3 is sandwiched between the engaging recess 17 b and the engaging protrusion 17 a ′ to form a semicircular locking portion 3 a. . Incidentally, by rotating the rod 33 by a required amount, the
It is possible to adjust the stop position put in the X direction of the two forming shape members 17 '. Also, a lock nut 37 is screwed into the threaded portion of the rod 33, and the rod 33 is fixed to the pipe 34 by rotating the lock nut 37 to abut the end of the pipe 34. I have. It said first
The height of the 'engagement recess 17b and the engaging projections 17a' in the 2 formed shape members 17 and 17, the first shaping member 15 described above (1
5 '), and a third formed shape member 16 (16') of the engaging projection 15c (16c) and the engagement recess 15a '(16
It is set to the same height as a '). The engaging projection 15c of the first molding member 15, the engaging projection of the third forming shape members 16 1
6c and engagement recess 17b of the second forming shape member 17 so as to be positioned in a straight line parallel with the Y direction. Also,
The dimensions of the engaging projections 15c, 16c, 17a 'are the same, and the dimensions of the engaging recesses 15a', 16a ', 17b are the same. Further, in this embodiment, the plate-shaped shim 3 between one side and the first mold member 15 of the second forming shape members 17
8 with interposing the, first the other side of the second forming shape members 17
Is interposed a plate-like shim 39 between 3 formed shape member 16. By replacing the shims 38 and 39 with ones having different thicknesses, the distance in the Y direction between the engaging recess 17b and the engaging protrusion 15c can be adjusted.
The distance in the Y direction between the engaging recess 17b and the engaging protrusion 16c can be adjusted. That is, the distance between the adjacent locking portions 3a formed on the wire 3 can be adjusted.

(Explanation of Operation of First Folding Device 5) The operation when the wire 3 is bent for the spiral stent shown in FIG. 13 by the first bending device 5 configured as described above will be described. In this case, before starting the work, shims 38 and 39 having a predetermined thickness are prepared in accordance with the interval between the locking portions 3a at one end side in the longitudinal direction of the adjacent wires 3 and as shown in FIG. The shim 38 is connected to both molding members 15,
17 and the first movable member 13 is
, The shim 39 is interposed between the molding members 17 and 16, and the second movable member 14 is
It is fixed to the base 11 at 8,22. In addition, since the wire 3 is supplied from the lower side in FIG. 1, in this case, the thickness of the shim 39 is thicker by a predetermined dimension than the thickness of the shim 38. Before starting the work, the handles 25, 3
5 and 27 are laid sideways, so that the engaging recesses 15a '(16a', 17b) and the
5c (16c, 17a ') are spaced apart. In this state, the linear wire 3 is inserted from the lower side in FIG.
5a '(16a', 17b) and the engagement projection 15c (16
c, 17a ') and grooves 15b, 16b
The wire 3 is supplied into the notch 17a, and the tip of the wire 3 is positioned at a position shifted upward by a predetermined dimension from the engagement recess 15a 'in the drawing. After this, first handle 2
5 is completely raised to the position shown by the solid line,
a ′ is advanced to the left, the wire 3 is sandwiched between the engaging recess 15a ′ and the engaging protrusion 15c, and a semicircular locking portion 3a bulging toward the right side is provided at that portion. Molded. next,
Thereafter, in a state in which the semi-circular first locking portion 3a is sandwiched between the engagement recesses 15a 'and the engagement projections 15c, the handle 35 at the center position is raised and the engagement projection 1
7a 'is advanced, and the engaging projection 17a'
7b and a flat portion at an adjacent position to the wire 3 between them.
But lightly pinch it. Thus, already the distance between the second locking portion for future molding a first engaging portion 3a of the already molded is to be determined accurately. Thereafter, the handle 25 on the upper side is returned to a horizontal position, and the engagement recess 15a 'and the engagement protrusion 15c are formed.
And the first locking portion 3 already formed.
a is disengaged upward from the engagement recess 15a '. In this state, the handle 35 at the center position is completely raised to the limit position, so that the wire 3 is sandwiched by the engagement protrusion 17a 'and the engagement recess 17b, and bulges toward the left side at that portion. The second locking portion 3a is formed. Thereafter, the handle 27 on the lower side is raised to advance the engagement recess 16a 'to the left, and the wire 3 is lightly nipped between the flat surface adjacent to the engagement recess 16a' and the engagement protrusion 16c. By
The already formed second locking portion 3a and the third
Is determined with the locking portion 3a. Thereafter, the handle 35 at the center position is horizontally tilted to release the engagement between the engagement projection 17a 'and the engagement recess 17b, and the second engagement portion 3a between them is disengaged upward. Immediately after this, the lower handle 27 is completely raised to the limit position, the wire 3 is sandwiched between the engaging recess 16a 'and the engaging protrusion 16c, and the wire 3 bulges toward the right side. A circular third locking portion 3a is formed. As a result, three locking portions 3a are formed sequentially from the leading end of the wire 3 to the rear. After supplying the wire 3 to the first bending device 5,
When the three handles 25, 35, 27 are raised simultaneously to lock the locking portions 3a at three locations, the front and rear portions of each locking portion 3a are strongly pulled and the wire is disconnected.
In order to prevent the wire 3 from being cut off during molding, the locking portion 3a is molded in the above-described procedure. Thereafter, the handle 27 is tilted sideways to release the engagement between the engagement recess 16a 'and the engagement protrusion 16c, and the molded third engagement portion 3a is disengaged upward from the engagement recess 16a'. After letting
The wire 3 is fed in until the third locking portion 3a is above the engagement projection 15c, and the third locking portion 3a is engaged with the engagement projection 15c. Next, the screws 18 and 22 are loosened to move the movable members 13 and 14 in the Y direction, and the shims 38 and 39 that have been interposed are removed. Shims 38 and 39 first
The molding member 15 and between the second forming shape members 17 of the second forming shape member 17 is interposed in the third forming shape member 16. Then, after that, the screws 18 and 22 are tightened, and the movable members 13 and
14 is fixed on the base 112. Thereafter, in a state where the third locking portion 3a is engaged with the engagement protrusion 15c,
With the handle 35 at the center raised, the wire 3 is lightly clamped between the engaging recess 17b and the engaging protrusion 17a ', and the position to be the fourth locking portion 4a is determined. Thereafter, after the third locking portion 3a is removed from the engagement projection 15c, and the handle 35 is completely raised to the limit position, the engagement recess 17b and the engagement projection 1
The wire 3 is sandwiched between the wire rod 7a 'and the semicircular fourth locking portion 3a which bulges toward the left side. Thereafter, the handle 27 on the lower side is raised in this state, and the wire 3 positioned therebetween is gently nipped by the engagement recesses 16a 'and the engagement protrusions 16c. After determining the position to be 3a, the center handle 35
Is tilted sideways to disengage the fourth locking portion 3a upward from the engaging recess 17b and the engaging protrusion 17a '. Next, after this, the lower handle 27 is completely raised to the limit position, the wire rod 3 is sandwiched between the engagement recesses 16a 'and the engagement protrusions 16c, and a fifth bulge toward the right side is formed. Form the locking part. Hereinafter, the same operation as described above is repeated to sequentially form the locking portions 3 a on the wire 3. On the center side in the longitudinal direction of the entire wire 3, the spacing between the adjacent locking portions 3 a, that is, The lengths of the straight portions 3b and 3c before and after the locking portion 3a are the same. Therefore, when molding the longitudinally central portion of the entire wire 3, the shims 38 and 39 are used.
Use the same thickness. Further, as shown in FIG. 13, the other end of the entire wire 3 in the longitudinal direction is
Since the lengths of the straight portions 3b and 3c before and after are gradually shortened, the thicknesses of the shims 38 and 39 are also gradually replaced with thinner ones. In this way, the wire 3 is bent by the first bending device 5 to form the engaging portions 3a which alternately bulge in the opposite direction at predetermined intervals of the wire 3.
Since the operation of forming the wire 3 in the first bending device 5 has been described on the assumption that the wire 3 is used for a spiral stent, the thickness of the shims 38 and 39 is changed depending on which part of the entire wire 3 is to be formed. However, when the wire 3 is formed for the straight stent shown in FIG. 12, the shims 38 and 39 having the same thickness may be used.
There is no need to replace 8,39. In other words, the first bending device 5 of the present embodiment is a dual-purpose type for a straight stent and a spiral stent.

(Structure of Second Bending Device 6) Next, the second bending device 6 will be described with reference to FIGS. 3 and 4. The second bending device 6 includes a base 41 that is supported horizontally and On the base 41, a rectangular plate-like member 42 is fixed. The plate-like member 42 has a T-shaped first concave portion 42a and a rectangular second concave portion 42b formed on the same straight line parallel to the X direction. Movable members 43, 44 having the same shape are accommodated in the respective concave portions 42a, 42b, and these movable members 43, 44 can be moved only in the X direction in the respective concave portions 42a, 42b. I have. A pair of coil springs 45 is elastically mounted over the opposing end surfaces of the movable member 43 and the first concave portion 42a.
Is constantly urged rightward in the first concave portion 42a. The right end surface of the plate member 42 has a first concave portion 42a
A through-hole 42c is formed to penetrate the rod 46 through the through-hole 42c. This rod 46
Is in contact with the end surface of the movable member 43. The outer peripheral portion on the right side of the rod 46 is a screw portion,
As in the case of the first bending device 5 described above, the rod 4
The threaded portion 6 is screwed to the end of the pipe 47, and the threaded portion of the rod 46 is threadedly engaged with a lock nut 48. By rotating the rod 46 in the opposite direction, the stop position of the movable member 43 in the X direction in the first concave portion 42a can be adjusted, and the lock nut 48 is rotated to abut on the end of the pipe 47. Thus, the rod 46 can be fixed to the pipe 47. A guide portion 41a is provided on the right upper surface of the base 41, and the pipe 47 is slidably passed through a through hole of the guide portion 41a. A bifurcated connecting portion 51a of a handle 51 is swingably connected to the right end of the pipe 47, and a pair of links 52 is provided between the lower side portions of the handle 51 and the guide portion 41a. Attached. When the handle 51 is laid down sideways as indicated by the imaginary line, the first
The movable member 43 is located on the rightmost side in the concave portion 42a. On the other hand, when the handle 51 is raised to the position shown by the solid line against the coil spring 45, the movable member 43 moves forward to the leftmost side in the first recess 42a. The movable member 43
A plate-shaped movable pin 53 is attached to the upper surface of the left end of the above, and the movable pin 53 is placed on the upper surface of the plate-shaped member 42 closer to the center than the first recess 42a. FIG.
As shown in FIG. 6, the portion on the distal end side of the movable pin 53 is formed so that the width is gradually reduced toward the distal end 53a, and has a V-shape when viewed in a plan view. And
Both sides of the V-shaped portion behind the front end 53a are used as support surfaces 53b. At a position on the extension of the tip of the movable pin 53, a columnar fixing pin 50 is erected on the plate member 41 vertically upward. The outer diameter of the fixing pin 50 protruding from the upper surface of the plate member 41 is set to the same outer diameter as the inner diameter of the locking portion 3a after the completion of molding. Further, in this embodiment, the lower peripheral portion of the fixing pin 50 is embedded in the plate-like member 41 in a state of being surrounded by the cylindrical urethane rubber 60. And handle 51
When the movable pin 53 is advanced to the forward end by the movement, the distal end of the fixed pin 50 comes into contact with the outer peripheral portion of the movable pin 53 as shown in FIG. In this embodiment, the movable pin 53 and the fixed pin 50 are separately provided. However, the fixed pin 50 is omitted, and a cylindrical member corresponding to the fixed pin 50 is provided at the tip of the movable pin 53. It may be formed integrally. On the other hand, a through hole 42d penetrating to the second concave portion 42b is formed in the left end surface of the plate member 42, and the rod 54 passes through the through hole 42d. The right end of the rod 54 is rotatably connected to the movable member 44.
Has a threaded portion on the left side, and the threaded portion is screwed to the end of the pipe 55. A lock nut 49 is screwed into the thread of the rod 54. Rod 5
By rotating the movable member 4 in the forward and reverse directions, the stop position of the movable member 44 in the X direction in the second concave portion 42b can be adjusted, and the lock nut 49 is rotated to make contact with the end of the pipe 55. Thereby, the rod 54 can be fixed to the pipe 55. The guide 4 is provided on the upper surface on the left side of the base 41.
1b is provided, and the pipe 55 is slidably penetrated through a through hole formed in the guide portion 41b. A bifurcated connecting portion 56a of a handle 56 is swingably connected to the left end of the pipe 55, and a pair of the lower side of the handle 51 and the guide portion 41b are connected to each other. The link 57 is attached. And
When the handle 57 is tilted sideways as indicated by the imaginary line, the movable member 4 is moved to the leftmost side in the second concave portion 42b.
When the handle 4 is retracted and the handle 57 is raised to the position shown by the solid line, the movable member 44 advances to the rightmost side in the second concave portion 42b. On the upper surface on the right side of the movable member 44, a clamp member 58 composed of a pair of left and right members is provided so as to be openable and closable, and the distal end side of the clamp member 58 is placed on the upper surface of the central part of the plate member 42. I have. A spring 59 is elastically mounted on the opposing surface on the distal end side of the clamp member 58, whereby the clamp member 58 is constantly urged to open. The outer side surface of the clamp member 58 is formed such that the distal end side has a reduced width, which is used as a sliding surface 58a. The sliding surfaces 58a are brought into contact with a pair of engaging pins 61 erected on the plate member 42. As shown in FIGS. 5 and 6 in an enlarged manner, the tip of the clamp member 58 is located on the opposite side of the movable pin 53 with the fixed pin 50 interposed therebetween. Further, a semicircular engaging recess 58b is formed at a position facing each other on the inner side of the distal end of the clamp member 58, and the distal end is further gradually expanded at the further distal end side. I'm shaving it. The engagement recess 58b
Both side surfaces, which are flatter than the leading end, are used as engagement surfaces 58c.
And, in a state where both handles 51 and 56 are tilted sideways,
As shown in FIG. 5, the distal end 53a of the movable pin 53 and the distal end of the clamp member 58 are separated from the fixed pin 50. On the other hand, when the handle 51 is set up, the movable pin 53 is advanced to the center side, and its tip comes into contact with the fixed pin 50 (FIG. 6), and from that state, the other handle 56 is set up. Then, the clamp member 58 moves forward to the center side, and the opened distal end is closed. At this time, the outer peripheral portion of the fixing pin 50 is vertically
8b, the support surface 53b of the movable pin 53 is held by the engagement surface 58c of the clamp member 58.

(Description of Operation of Second Bending Apparatus 6) The operation of the second folding apparatus 6 having the above configuration will be described. Before the start of the work, both handles 51, 56
Is reclined sideways as indicated by the imaginary line, so that it is retracted and separated from the fixed pin 50 between the tip 53a of the movable pin 53 and the tip of the clamp member 58 (FIG. 5).
In this state, the wire 3 formed by the above-described first bending device 5 is placed on the upper surface of the plate-like member 42 at the position of the fixing pin 50, and the first locking portion 3 a is attached to the fixing pin 50 by leftward. (FIG. 5). Next, when the handle 51 is raised from this state to the position shown by the solid line, the movable pin 53 is advanced to the forward end, and the tip 53a is fixed to the fixed pin 50.
(FIG. 5). Thereafter, when the left handle 56 is raised to the position shown by the solid line, the clamp member 58 is advanced toward the fixing pin 50, and the distal end of the clamp member 58 that has been opened is closed gradually. .
Thereby, after the front and rear linear portions 3b and 3c of the locking portion 3a are inclined toward the right side by the distal end portion of the clamp member 58, the locking portion 3a is supported from the inside by the fixing pin 50. In this state, the engaging portion 58b is sandwiched by the two engaging concave portions 58b, whereby the semicircular engaging portion 3a is formed into a substantially C-shaped substantially circular shape (FIG. 6). In addition, the locking portion 3a
Are sandwiched between the engaging surfaces 58c and the support surface 53b of the movable pin 53, so that the locking portion 3a and the front and rear straight portions 3b and 3c are generally V-shaped. (FIG. 6). After the first locking portion 3a and its front and rear portions have been formed in this way, the handle 56 is returned to the side again, and the clamp member 58 is retracted and its distal end is opened. As a result, the clamped state of the first locking portion 3a by the distal end portion of the clamp member 58 is released, and the first locking portion 3 is fixed to the fixing pin 50.
From the upper side. Thereafter, the first locking portion 3 is sent upward in the drawing of FIG. 3 and the next second locking portion 3 is engaged with the fixing pin 50. As described above, since the swelling directions of the locking portions 3 that are adjacent to each other are opposite to each other, the second locking portion 3 is connected to the distal end portion 53 a of the movable pin 53.
Immediately before the wire 3 is engaged, the entire wire 3 is turned over. After that, if the handle 56 is set up, the clamp member 5
8 is advanced and closed, and the second locking portion 3a is closed.
Is clamped by the inside of the distal end of the clamp member 58. Therefore, the second locking portion 3a is also formed into a substantially circular shape, and the second locking portion 3a and the linear portions before and after the second locking portion 3a are formed into a V-shape as a whole. Hereinafter, in the manner described above, the locking portions 3a that are sequentially rearward and the straight portions before and after the locking portions 3a are formed. As described above, in the present embodiment, the wire 3 is formed by the first bending device 5 and the second bending device 6 as described above, so that all the forming operations are performed manually as compared with the related art. The dimensional accuracy of each part of the wire 3 after the completion of the forming is improved, and the forming operation can be simplified to improve the working efficiency. In the case of forming the wire 3 to the engaging portion 3a as a straight stent, only the third forming shape members 17, 17 'of the central position in the first folding device 5 shown in FIG. 1 on the base A configuration in which two are provided in parallel may be used. That is, in the case of a stent for a straight type stent, the dimensions of the straight portions 3b and 3c before and after the locking portion 3a are all the same.
2 to the third forming shape members 17, 17 'only on the base
Even with a configuration provided in parallel, the above-described operation and effect of the present embodiment can be obtained. In this case, adjacent
'Engaging projection 17a of the' third forming shape members 17 and 17
It is necessary to form the (engaging recesses 17b) in mutually opposite directions. In moving both movable members 13 and 14 in the first bending device 5 shown in FIG. 1 in the Y direction,
A nut member may be provided on the side of both movable members 13 and 14, and the screw shaft on the drive motor side may be screwed into the nut member.

[0013]

As described above, according to the present invention , the conventional
Mechanical shaping of the semicircular locking part, which had been
It is possible to process, when compared with traditional, improved dimensional accuracy of each part of the wire after the completion of molding, and the effect that the molding operation can improve the working efficiency by simplifying is obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a first folding device showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

Figure 3 is a plan view of a second folding device

FIG. 4 is a sectional view of a main part taken along line IV-IV in FIG. 3;

FIG. 5 is an enlarged view of a main part shown in FIG. 3;

FIG. 6 is a plan view showing a different state of each member shown in FIG. 5;

FIG. 7 is a front view of a stent on which the present invention is based.

FIG. 8 is a cross-sectional view of a blood vessel showing a state where a stent is placed.

FIG. 9 is a plan view showing a forming process of the wire rod.

FIG. 10 is a plan view showing a forming process of the wire rod.

FIG. 11 is an enlarged view of one of the locking portions formed on the wire rod.

FIG. 12 is a plan view of a wire rod formed for a straight stent.

FIG. 13 is a plan view of a wire rod formed for a spiral stent.

FIG. 14 is a front view of a spiral stent.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Stent 3 Wire 3a Locking part 5 1st bending apparatus 6 2nd bending apparatus 15, 15 '
First shaping member 16, 16 'third forming shape members 17, 17'
Second forming shape members 38 and 39 shims (gap adjusting means) 53 movable pin 53a tip 53b supporting surface 58 the clamping member 58b engaging recess 58c engaging surface

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21F 1/00 A61M 29/00

Claims (3)

(57) [Claims] 1. A pair of first molding members, each of which has a semicircular engagement portion that engages with each other at opposing locations, and is provided so as to be relatively movable in an X direction that is a direction of coming and coming from each other. A pair of second forming members, which are arranged in parallel with the first forming member, form semi-circular engaging portions that engage with each other at opposing positions, and are provided so as to be relatively movable in the X direction. provided, the protruding semicircular engaging portion of the first mold member and the semicircular engaging portion of the second formed shape member in opposite directions, and in the first mold member and the second forming member To Y orthogonal to the X direction.
The wire is sandwiched between the engaging portions of the molding members, and semicircular locking portions projecting in opposite directions are formed by providing a predetermined linear portion between the two. An apparatus for bending a wire rod. 2. The second molded member is opposed to the first molded member.
To be relatively movable in the Y direction.
While the first molding member and the second molding member are separated in the Y direction
2. The wire bending apparatus according to claim 1, further comprising an interval adjusting means for adjusting the interval . 3. The apparatus according to claim 2, wherein said distance adjusting means is provided for each of said molded members.
3. A shim interposed therebetween.
A wire bending apparatus according to claim 1.