A kind of shaper of memory alloy stent ring and processing method for shapingTechnical field
The invention belongs to technical field of medical instruments, more particularly to a kind of memory suitable for memorial alloy intravascular stent to closeThe shaper and processing method for shaping of golden support ring.
Background technology
Arotic disease particularly aortic aneurysm is a kind of serious threat patient vitals, the high cardiovascular injuries of fatal rateAcute disease.According to statistics, the non-annual death rate of curer 5 is 50%~76%, and the death rate for the person that merges heart and lung diseases is up to 93%.90Before age, surgical operation is to treat the main method of arotic disease, but this operation method wound is big, operating timeLength, complication is more, the death rate is high, and for thoracoabdominal aortic aneurysm operative mortality rate up to 5%~26%, paraplegia incidence is 4.6%.In recent yearsCome, with the development of Micro trauma interventional therapeutic technique, endoluminal vascular support graft exclusion treatment arotic disease is able to widely shouldHave that wound is small, bleeding is few with, this operation method, the traditional surgery such as treatment time is short, good effect, repeatability treatmentThe advantages of method is incomparable.Intravascular stent is sent into diseased region using intravascular stent delivery device, made by intravascular stentInterlayer or the blood flow of knurl intracavitary disappear, and form thrombus, hereafter gradually absorb or completely cut off lesion, to reach treatment arotic diseasePurpose.
Memorial alloy intravascular stent is softer at 0 DEG C~10 DEG C, can arbitrarily change shape, and energy side within the specific limitsJust, it is readily integrated into delivery device.By delivery device by the diseased region of stent pushing to patient, under human body temperature, blood vesselStent-expansion, resile, be in close contact with vascular wall, and certain radial support power is produced on vascular wall, controlled with reachingThe purpose for the treatment of.
Memorial alloy intravascular stent forms by memory alloy stent ring and overlay film, and support ring is located at mount proximal end by oneNaked frame and overlay film part some main body rack ring groups into.At present, the naked frame of in the market and support ring are by memory alloy pipesMaterial forms through laser engraving or the braiding of memorial alloy silk material.The support ring of memorial alloy silk material braiding is open loop, it is necessary to use noteRecall alloy spring winding method or stainless steel tube crimping mode two heads are connected as one, exist bonding strength it is poor, shapeThe problems such as property is poor, compression diameter is big；Although the support ring or naked frame formed by memorial alloy tubing laser engraving avoids above-mentionedProblem, but memorial alloy tubing is expensive, and rapid laser carving cost is high, has raised the cost of support.
The content of the invention
In view of the above-mentioned problems, the present invention, which proposes one kind, to avoid bonding strength existing for silk material braided support ringWhile low, various drawbacks such as formability is poor, compression diameter is big, and reduce material cost and processing cost, and improve plusThe shaper and processing method for shaping of the memory alloy stent ring suitable for memorial alloy intravascular stent of work efficiency rate.
A kind of shaper of memory alloy stent ring, including：Surface is provided with the die main body of pin, located at the mouldTool body top lifts disk, the push rod that connects is engaged with the screwed hole at the top of the die main body and along the die main body tableThe drag hook that the guide groove in face slides, one end of the drag hook be hooked in it is described lift disk, the push rod is by rotary moving, and bandThe dynamic disk of lifting rises or declined, so as to drive the drag hook to be slided up or down along the guide groove, pin and guidingGroove is alternates setting, and the quantity of drag hook, pin, guide groove is N, and N is the positive integer more than or equal to 2.
For memorial alloy sheet material to be strutted by being stamped or cut out the support ring that mode obtains, support ring is alternately fixed onBetween pin and drag hook.
The support ring is the circle or n sides shape of closing, and n is the even number more than or equal to 4.
It is alternate successively on n interior angle of n sides shape to be provided with n/2 hangnail, cushion block is provided with the guide groove, is led toThe inclined-plane for crossing cushion block jacks up hangnail.
The shaper is divided into taper shaper and cylindricality shaper according to the shape of the support ring.
The pin is uniformly distributed circumferentially in the cylinder or the conical surface of the die main body, and the guide groove is in the mouldMain body cylinder or the conical surface are uniformly distributed circumferentially, and N number of pin is along the circumferential direction staggered with N number of guide groove.
The drag hook is slice-shaped part, and the guiding well width of die main body described in its thickness ratio is small；The drag hook includesPull bar and the wedge-shaped slot for being arranged on the pull bar surface, the wedge-shaped slot on the drag hook are hooked in the wedge shape lifted on diskFace, pull bar and the n angular n exterior angle of the drag hook hook.
The push rod from top to bottom successively include be slidably matched with the mesopore for lifting disk light bar segment, for supportingState the boss for lifting disk and the thread segment being used cooperatively with the screwed hole on the die main body.
A kind of memory alloy stent ring processing method for shaping based on shaper described in claim 1, including following stepSuddenly：
Pass through punching press or spark cutting mode machining support ring with memorial alloy sheet material；
The support ring is set in the shaper surface, and cooperated by pin and pull bar to fix；
By drag hook drawing and die main body is spacing struts the support ring for solid and be attached at the die main bodySurface turns into preliminary three-dimensional bracket ring；
By the preliminary three-dimensional bracket ring through Overheating Treatment solid shape, three-dimensional bracket ring is finally given.
It will strut and be fixed on what the preliminary three-dimensional bracket ring on shaper was set in 400-600 degree Celsius rangesAt a temperature of heat and be incubated the time of setting, and the type of cooling is taken, so as to which support ring is shaped into three-dimensional shape.
The beneficial effects of the present invention are：The shaper and processing method for shaping of memory alloy stent ring both avoid silkThe shortcomings of bonding strength existing for material braided support ring is low, formability is poor, compression diameter is big, while with being swashed with memorial alloy tubingLight carves naked frame and support ring is compared, and reduces material cost and processing cost, improves processing efficiency.
Moreover, memory alloy stent ring is processed by punching press or spark cutting mode with memorial alloy sheet material, it is such to addWork mode is simple, and processing cost is low, high in machining efficiency.Memorial alloy sheet material is readily available compared with tubing, and the cost of material is low.Passing through willThe planar bracket ring of different dimensions is arranged, and can greatly improve stock utilization.
Brief description of the drawings
Fig. 1 is not barbed five angle planes support ring schematic diagram in the present invention.
Fig. 2 is barbed five angle planes support ring schematic diagram in the present invention.
Fig. 3 is not barbed circular flat support ring schematic diagram in the present invention.
Fig. 4 a are conical stent ring sizing taper shaper schematic diagram in the present invention.
Fig. 4 b are cylindrical stent ring sizing cylindricality shaper schematic diagram in the present invention.
Fig. 5 a are that the die main body of shaper in the present invention is the structural representation of taper die main body.
Fig. 5 b are that the die main body of shaper in the present invention is the structural representation of cylindrical mold main body.
Fig. 6 is the drag hook schematic diagram of shaper in the present invention.
Fig. 7 is the push rod schematic diagram of shaper in the present invention.
Fig. 8 is that shaper lifts disk schematic diagram in the present invention.
Fig. 9 is the cushion block schematic diagram of shaper in the present invention.
Figure 10 a are cylindrical stent ring sizing schematic diagram in the present invention.
Figure 10 b are conical stent ring sizing schematic diagram in the present invention.
Figure 11 a are finished product schematic diagram of the cylinder without hangnail support ring in the present invention.
Figure 11 b are finished product schematic diagram of the cone with hangnail support ring in the present invention.
Figure 12 is that midplane support ring of the present invention processes arrangement schematic diagram.
Embodiment
Below in conjunction with the accompanying drawings, embodiment is elaborated.
The shaper of memory alloy stent ring provided in an embodiment of the present invention is used to memorial alloy sheet material passing through punching pressOr the planar bracket central shoring that cutting mode obtains is opened as three-dimensional bracket ring.Wherein, the memorial alloy sheet material is run after fame adopted composition54.5wt%-57.0wt%Ni NiTi memorial alloys, and the memorial alloy sheet material can be that rectangle can also be circular, thicknessSpend for 0.1mm-2mm.In the present embodiment, the memorial alloy sheet material can be forged by memorial alloy ingot casting, be rolling,Also can be obtained by memorial alloy bar perpendicular to axially cutting.
Moreover, such as：Shown in Fig. 1, Fig. 2 and Fig. 3, the planar bracket ring is the circle of closing, pentagon, hexagon, sevenAngular, octagonal, nonagon, regular decagon, undecagon, dodecagon.The planar bracket ring can be with hangnail also withoutThorn, and the angular planar bracket rings of N have N number of exterior angle 19 and N number of interior angle 20, wherein, N is positive integer.In the present embodimentIn, the planar bracket ring can be by obtaining to memorial alloy sheet material progress punching press or spark cutting mode.
Accordingly, as shown in figures 4 a and 4b, the shaper of the memory alloy stent ring is according to the shape of support ringShape is divided into taper shaper and cylindricality shaper；And the shaper of the memory alloy stent ring can be according to described flatThe head number of face support ring be divided into five shapers, six shapers, seven shapers, eight shapers, nine it is fixedPattern tool, ten shapers, 11 shapers or 12 shapers.
Moreover, the shaper of the memory alloy stent ring can be with the support ring height of patterning process for 5-50mm, coneDegree α is 0-60 degree, and diameter (conical support fourth finger end diameter) is 5-50mm.
In the present embodiment, as shown in figures 4 a and 4b, the shaper of the memory alloy stent ring is set including surfaceThe die main body 1 for being equipped with pin, the drag hook 2 slided along the guide groove 6 on the surface of die main body 1, push up with the die main body 1The push rod 3 of the screwed hole engagement connection in portion, lifting disk 4 and be used cooperatively with the drag hook 2 located at the top of the die main body 1Cushion block 10.Disk 4 is lifted in one end of the drag hook 2 described in being hooked in, and the push rod 3 drives the support by rotary movingLift disk 4 to rise or decline, so as to drive guide groove 6 of the drag hook 2 along the surface of die main body 1 to slide up or down.
As shown in figure 5 a and 5b, the die main body 1 divides for taper die main body and cylindrical mold main body, above has N number ofPin 5, N number of guide groove 6 and a screwed hole 7.Pin quantity is identical with the support take capel number shaped with guide groove quantity,All pins 5 are uniformly distributed circumferentially in the cylinder of die main body 1 or the conical surface, and all guide grooves 6 are in the cylinder of die main body 1 or the conical surfaceIt is uniformly distributed circumferentially, and pin 5 is along the circumferential direction staggered with guide groove 6, N number of pin 5 and the plane branch angular NN number of interior angle of frame ring hooks.
As shown in fig. 6, the drag hook 2 is slice-shaped part, the width of guide groove 6 of its thickness ratio die main body is smaller, canAlong guide groove slidably.Drag hook includes pull bar 8 and is arranged on the surface wedge-shaped slot 9 of pull bar 8.Wedge-shaped slot 9, which is hooked in, to be liftedOn lozenges 18 on disk 4；N number of exterior angle of the pull bar 8 of N number of drag hook 2 and the planar bracket ring angular N hooks.
As shown in fig. 7, the push rod 3 include be slidably matched with the mesopore for lifting disk 4 light bar segment 14, for supportingThe boss 15 for lifting disk 4 and the thread segment 16 being used cooperatively with the screwed hole 7 on the die main body 1.
As shown in figure 8, the disk 4 of lifting is made up of the ring-type lozenges 18 of periphery and the mesopore at middle part, mesopore and push rod 3On light bar segment 14 be slidably matched.
As shown in figure 9, the cushion block 10 is wedge metal piece, the width of guide groove 6 of die main body 1 described in its thickness ratio omitsIt is small, can be along guide groove 6 slidably；Its ramp is used to support ring hangnail is propped up into required angle when support ring is shaped；ThereonA groove 11 is tied up, for the pull bar 8 of cushion block and the drag hook 2 being bound by tying up silk.
As as-shown-in figures 10 a and 10b, using the memory alloy stent ring with shaper by the planar bracket ringStrut as solid, refer to hang on all interior angles 20 of planar bracket ring on the pin 5 of die main body 1, by all exterior angles 19Hang on the pull bar 8 of the lower end of drag hook 2；Drag hook 2 is embedded in the guide groove 6 of die main body 1, and can be glided along guide grooveDynamic, the wedge-shaped slot 9 of the upper end of drag hook 2 is taken on the lozenges 18 for being placed on and lifting disk 4；Disk 4 is lifted to be placed in the light bar segment 14 of push rod 3 simultaneouslyHeld by the boss 15 on push rod, can be along light bar segment relative to slip, rotation；The thread segment 16 of push rod 3 is threaded onto the spiral shell of die main body 1In pit 7.
Rotate counterclockwise push rod 3, boss 15 drive and lift disk 4 and rise, because of drag hook 2 by the lodge of wedge-shaped slot 9 in lifting on disk,Therefore lift disk and drive drag hook to rise along guide groove 6, drag hook pulls planar bracket ring exterior angle 19 along die main body by its upper connecting rod 8The conical surface or cylinder rise；Because planar bracket ring interior angle hang on it is immovable on the pin 5 of die main body 1, so that with push rod 3Rise, planar bracket ring, which is finally tightened up and fitted in, turns into three-dimensional bracket ring on the conical surface or cylinder of die main body 1.If support ringThere is hangnail 17, then also need cushion block 8 being embedded in the guide groove 6 of body die 1, and rely on its inclined-plane by support ring hangnail topRise, hangnail jacks up the angle that angle depends on cushion block inclined-plane.
Moreover, in embodiments of the present invention, as shown in Figure 10 a, Figure 10 b, Figure 11 a and Figure 11 b, processing support ring can be withFor cylindrical stent ring, or conical stent ring；Both can be with hangnail 17, also can be without hangnail.
A kind of processing method for shaping of the shaper of the memory alloy stent ring according to Fig. 1 specifically includes following stepSuddenly：
Planar bracket ring is processed by punching press or spark cutting mode with memorial alloy sheet material；
The planar bracket ring set is located at the shaper surface, and cooperated by pin and pull bar to fixThe planar bracket ring；
By drag hook drawing and die main body is spacing opens the planar bracket central shoring for solid and be attached at the mouldBody surfaces turn into preliminary three-dimensional bracket ring；
By the preliminary three-dimensional bracket ring through Overheating Treatment solid shape, three-dimensional bracket ring is finally given.
It should be noted that in heat treatment process, it will strut and be fixed on the preliminary three-dimensional bracket on shaperHeated under the suitable temperature that ring is set in the range of 400-600 degree and be incubated the time of setting, and take the appropriate type of cooling,So as to which support ring is shaped into three-dimensional shape.
Compared to prior art, the shaper and processing method for shaping of memory alloy stent ring provided by the invention were both kept awayExempted from the shortcomings of bonding strength existing for silk material braided support ring is low, formability is poor, compression diameter is big, at the same with memorial alloyThe naked frame of tubing laser engraving and support ring are compared, and are reduced material cost and processing cost, are improved processing efficiency.
Moreover, memory alloy stent ring is processed by punching press or spark cutting mode with memorial alloy sheet material, it is such to addWork mode is simple, and processing cost is low, high in machining efficiency.Memorial alloy sheet material is readily available compared with tubing, and the cost of material is low.Passing through willThe planar bracket ring of different dimensions is arranged, and can greatly improve stock utilization, as shown in figure 12.
This embodiment is only the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto,Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claimsIt is defined.