CN1389271A - Knitted medical internal metal rack and its making process - Google Patents
Knitted medical internal metal rack and its making process Download PDFInfo
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- CN1389271A CN1389271A CN01113035A CN01113035A CN1389271A CN 1389271 A CN1389271 A CN 1389271A CN 01113035 A CN01113035 A CN 01113035A CN 01113035 A CN01113035 A CN 01113035A CN 1389271 A CN1389271 A CN 1389271A
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Abstract
The present invention relates to a knitted medical internal scaffold made of nickel-titanium shape memory alloy filament. Said alloy filament possesses the good biological compatibility and features super-elasticity, high-weight, strong corrosino resistance, good fatigue resistance, good compression resistance and good tension resistance, and completely is applicable to human body. Said invention adopts straight cylinder and conical cylinder small-aperture knitting machine and adopts double-cylinder knitting technique to produce said invented internal scaffold product. Said scaffold product possesses uniform loop structure, its sinker loop is similar to the form of needle loop, and their length is approximate, so that under the condition of low temp. Said internal scaffold can be maximally deformed, therefore it is convenient for implantation operation in the course of operation.
Description
The present invention relates to a kind of medical internal metal rack, particularly disclose a kind of knitted medical internal metal rack, belong to medical mechanical domain.
Medical internal metal rack is one of advanced in the world at present medical apparatus and instruments.Not long to its research history abroad, domestic it is manufactured is confined to craft, small lot batch manufacture.Medically, there are a lot of diseases or operation to cause some luminal stenosis, block, unhealthful, severe patient increases the weight of disease, even threat to life.For this reason, people once used various apparatuses or air bag to expand in the affected part or support, but the work more complicated, and may produce other complication.Application of rubber pipe or silica gel tube are easily aging as air-bag support or supporter, distortion, and tissue reaction is big, and effect is imprecise.Owing to make the limitation of material itself, there are complicated operation to some extent in commonly used stainless steel stent, titanium alloy support and polyurethane support etc., fixedly owe shortcoming such as firm.They all can not long-term existence in human body, to a certain extent, limited the development of surgical technic.Nick-eltitanium alloy stent not only has the favorable tissue compatibility, but also has unique shape memory characteristic.Utilize this characteristic that support is inserted in the body, easy and simple to handle, be easy to grasp.This support is specially adapted to get old and weak, the patient of unsuitable open surgery.It is reported that at present, nick-eltitanium alloy stent can be used for treating the urethral obstruction due to the prostatic hyperplasia, esophagus, biliary tract, tracheal stenosis as a kind of new palliative therapy means, are received effect preferably in clinical.Figure 1 shows that the operation principle of niti-shaped memorial alloy support.With the netted braiding inner support of cardiovascular is example, at first as required, support is made certain shape (Fig. 1 (a)).Fig. 1 (b) is depicted as the angiostenosis that human body causes because of various diseases such as tumors.Fig. 1 (C) be depicted as at low temperatures support is become tiny, be easy to place intravital shape.Fig. 1 (d) is depicted as by guiding tube support is inserted human body.Through body temperature heating, implant frame can recover its original shape voluntarily and give demulcent support and expansionary force, and tract and combine with it in supporting to keep unobstructed blood vessel, slows down narrow.Fig. 1 (e) is depicted as the application result of part blood vessel prosthesis.
The prior art support has stainless steel stent, titanium alloy support, nick-eltitanium alloy stent, tantalum wire support according to the raw material branch, according to basic forming principle branch inflation molding inner support, elastic forming inner support and temperature memory molding inner support are arranged, according to framework's structure branch helical stent pipe, manual woven mesh support tube are arranged, helical form inner support pipe is made simple, low price, firm position, insertion and convenient to remove, but support inner surface and tissue non-homogeneous should not be covered by tissue.Manual woven mesh support tube has homogeneity preferably, and recoverability is good, and insertion process is simple, and is few with material, Stability Analysis of Structures, but this support only limits to make by hand, required stent length can only customize in the operation, can not be as required clip arbitrarily.
The objective of the invention is to disclose a kind of knitted medical inner support and manufacture method thereof, the inner support structure is that knitting latitude flat needle structure support is to weave to form on small-bore knitting circular knitting machine, it has the strong point of manual woven mesh support, homogeneity is preferably arranged, simple in structure, utilize the latitude plain stitch along the contrary collapsible characteristic of weaving direction, when the tractive respective taps, this support can be broken, thereby this support takes out in the human body also very conveniently, and it and helical form inner support Guan Junke be random clip as required.
The present invention realizes like this; A kind of knitted medical internal metal rack, it is the inner support pipe that the niti-shaped memorial alloy silk is formed, and it is characterized in that the inner support shape that the niti-shaped memorial alloy silk is formed is a cylindrical shape, the inner support structure is knitting latitude plain construction.Knitted medical internal metal rack, niti-shaped memorial alloy silk knit latitude plain construction inner support even structure degree is good, coil sinker loop portion section (1) and needle loop portion section (2) plesiomorphism, length is close, can reach distortion to greatest extent under the low temperature.Knitted medical internal metal rack, the flat pin internal metal rack of niti-shaped memorial alloy silk knit latitude bore can be at 3mm～28mm.Knitted medical internal metal rack, niti-shaped memorial alloy silk nickel content is 54～56%.The manufacture method of knitted medical internal metal rack, employing weaves on the knitting machine of special use, braiding niti-shaped memorial alloy inner support also will through moving back circle, pad yarn, remain silent, knocking over, kinking, these stages of lopping, it is characterized in that: A) adopt strengthen traction force and frequently on pin the method for oiling agent make to move back and be not prone to needle latch backwash phenomenon when enclosing; B) because of the rigidity of nitinol alloy wire big, not yielding, caused the normally knocking over of old coil, choose tongue and go up high higher latch needles again, increase coil when helping weaving and be convenient to transfer between the coil, help knocking over, pretreatment guaranteed the smooth knocking over of alloy silk to reduce its rigidity before the alloy silk was woven; The manufacture method of knitted medical internal metal rack is taked the crosspointer knitting skill, and promptly adjacent two pieces of pins weave a big coil simultaneously, makes its needle loop portion section of inner support and the sinker loop portion segment length of gained approaching, and coil transfer and deflection under low temperature state are big.The manufacture method of knitted medical internal metal rack, need preceding normalized treatment of involutory spun gold braiding and the annealing in process after the braiding, it promptly is that the alloy silk is heated to uniform temperature that involutory spun gold carries out normalized treatment, in air, cool off then, annealing in process promptly is that the alloy silk is heated to more than the critical temperature, and through cooling off in air after the insulation after a while, annealing treating process is: the alloy silk is heated to 460 ℃ in the metallographic stove again, insulation is 45 minutes in stove, cools off in air then.The special equipment of a kind of knitted medical internal metal rack product and manufacture method, special equipment is custom-designed knitting machine, syringe bore scope is at 5mm～30mm, the preferential taper syringe that adopts, adopt one tunnel cam system, when weaving the medical internal metal rack bore when 5mm is following, adopt the taper syringe; The internal metal rack bore adopts straight shape syringe or taper syringe when 5mm is above.
The present invention is further described with accompanying drawing below.
The operation principle of accompanying drawing 1 recalled nitinol alloy stent.
Accompanying drawing 2 product structure sketch maps of the present invention.
Embodiment: with reference to the accompanying drawings the present invention is elaborated.(1) selection of raw material
316L and 317L type rustless steel are widely used metallic biomaterials.But researcher is just being made great efforts to study the performance of niti-shaped memorial alloy and is being made this class inner support both at home and abroad in recent years, mainly utilize the shape memory effect of niti-shaped memorial alloy, the compression ratio of inner support is improved greatly, thereby make operation more convenient, even can place by scope, the diseases such as urethral stricture that treatment stenosis of common bile duct, angiostenosis and prostate hyperplasia cause are exempted open surgery, alleviate patient's misery greatly.Application prospect is very tempting.
Shape memory effect is meant that the memorial alloy test specimen with definite shape is after special handling, (martensitic phase) gives obvious deformation under low temperature state, test specimen is warmed to (phase transition temperature) after the uniform temperature, test specimen can recover its original shape (Ovshinsky bulk phase), and in shape recovery process, produce bigger restoring force, thereby be widely used in field of engineering technology.It is reported that the alloy with shape memory effect is kind surplus in the of existing 20 at present, but be the niti-shaped memorial alloy of nickel content between 54-56% in the tool development and application prospect of medical domain.Niti-shaped memorial alloy has characteristics such as shape memory effect, super-elasticity, endurance, wear-resistant, corrosion-resistant and good biocompatibility, is considered as a kind of novel medical biotechnology functional material by people, and obtains using comparatively widely at clinical medicine.In recent decades, Japan, the U.S., Germany etc. have done a large amount of basic research to marmem, and countries such as America and Europe have held repeatedly international conference, in the clinical medicine application facet many reports are arranged also.China starts from 1979 to the basic research of marmem, though start late, we can say at present to be in the first place in the world aspect clinical practice.To the application of niti-shaped memorial alloy, positive tooth, orthopaedics, orthopedic expand to all kinds of inner supports of diseases such as curing urethra, esophagus, biliary tract, trachea, blood vessel, proctostenosis just gradually from the oral cavity.This problem is selected the material of niti-shaped memorial alloy as knitted medical internal metal rack for use by a large amount of investigation.It has the following characteristic: 1. relevant with medical science Nitinol performance
Fusing point: 1240-1310 ℃ proportion: 6.45g/cm
3
Recovery temperature: 30-45 ℃, can decide according to specific use
Tensile strength: σ
b=1078-1300Mpa percentage elongation: δ=20-40%
Fatigue point: 558Mpa shear strength: 725-921Mpa
Elastic modelling quantity (40 ℃ time) 22000Mpa superelastic strain amount:＞7%
Heat plastic strain: 〉=8% heating recovers stress: 400Mpa
Phase transition temperature: M
S=223K---343K
Young modulus varies with temperature and changes, and is as shown in table 1.
Table 1 young modulus varies with temperature relation
2. histocompatibility and anti-corrosive properties (1) toxicity
| Temperature (℃) | -10 | ?0 | ?22 | ?37 | ?45 | ?100 |
| Young modulus E (Gpa) | 58.9 | ?58.9 | ?61.1 | ?63.7 | ?64.2 | ?71.5 |
As everyone knows, simple metal is dived to human body and is contained toxicity.Be arranged as by toxicity: hydrargyrum, cadmium, lead, chromium, antimony, osmium, zinc, manganese, silver, nickel, gold, stannum, bismuth, copper, ferrum, palladium, vanadium, germanium, cobalt, the toxicity of nickel metal is placed in the middle.Therefore, China and foreign countries' researcher is taked careful attitude to the stability of the nickel ion in the Nitinol, and studies the toxicity and the biocompatibility of Nitinol respectively from different perspectives.Result of study shows that nickel ion is stable in Nitinol.The alloy organizing compatibility is better than medical stainless steel, and is similar with cochrome, some aspect even be better than cochrome.The NiTi bone rivet of approved Mitek company of nineteen ninety U.S. food medicine committee (FDA) comes into the market to apply.Nanjing Medical University, Southeast China University draw the good biocompatibility of this alloy bracket, no obvious toxic and side effects by the analytical test to nickel-titanium shape memory effect endovascular stent.(2) corrosion resistance
Niti-shaped memorial alloy has fabulous corrosion resistance.Rate of corrosion in seven kinds of media such as artificial saliva, artificial perspiration, Hand ' s physiological liquid, 1%Nacl aqueous solution and 0.05% hydrochloric acid is all less than 6.8 * 10
-5Mm/, chemical corrosion resistance all belongs to extremely strong, considerably beyond normal limit dissolution velocity.This corrosion resistance can make Nitinol be stored in human body for a long time.(3) histocompatibility
China and foreign countries' researcher finds that through the arduous research in more than 20 years Nitinol meets the transplanting requirement.Its histocompatibility be medical stainless steel, carbon fiber, cochrome can not than.3. memory effect
Niti-shaped memorial alloy is that the thermoplasticity martensitic state transforms, and by the proportion of change nickel, and uses different heat treatments, can obtain one way, round trip or multipass shape memory effect.Alloy can produce sizable power in Recovery Process, can make mechanical power in various degree.For example: 1mm
2The NiTi nail can produce 85kg power in Recovery Process.4. super-elasticity
Niti-shaped memorial alloy can be interpreted as " flexibility in the rigidity and the rigidity in the flexibility " and " coordination of potent and mild therapies ".Under similarity condition, the residual deformation of Nitinol is 1/10 of a medical stainless steel, and bending moment is stainless 3/8.5. other performance
The proportion of Nitinol can make its elastic modelling quantity and bone photo work as less than rustless steel through suitable heat treatment.These behavioral illustrations Nitinols and medical stainless steel are essentially different.Generally speaking, Nitinol is dynamic, variable, and its mechanical performance is successive, dynamic and resilient.(2) special equipment---knitting machine design
Medical metal stand wants flexibility well also certain resistance to compression effect can be arranged in blood vessel, trachea and esophagus in human body.Yarn can shift between the coil with coil arrangement in the weft-knitted fabric, has higher strain, meets the requirement of medical metal stand.
The braiding of medical metal stand is identical with the The Knitting Principle of common knitted fabric, but it has the characteristics of self again:
A, syringe bore are little, and scope is between 5mm-30mm.
B, syringe can adopt straight shape, but for satisfying small-bore requirement, the taper syringe is better.
C, the tinsel scope that can weave are 0.1-0.3mm, and needle tray is bigger than common needle tray usually.
D, because of syringe is very little, only adopt one tunnel cam system.
For satisfying different needs, the medical internal metal rack knitting machine should be the knitting machine system of a series.According to test, the inner support bore does not wait from 5mm-30mm in the footpath from 3mm to 28mm respective needle nozzle.1. knitting needle
Latch needles is one of main loop-forming element on the knitting machine.Its characteristics of motion and mechanical characteristics will directly have influence on the weaving performance and the work efficiency of knitting machine.Compare with common knitting machine, the knitting machine of braiding medical internal metal rack except that general performance, also has following some property to the requirement of latch needles: ● tongue is gone up high high as far as possible again, during braiding, can make wire coil big as far as possible, helps knocking over, lopping, also has
Be beneficial to the transfer between the coil.● the latch needles traverse is as far as possible little, helps reducing the triangle height.● because wire coils is very big to the pressure of latch needles in the knocking over process, be easy to damage needle latch.Therefore,
Hardness to latch needles requires than general latch needles height.
In addition, for improving the wearability of latch needles, should select the high steel of chrome content for use; Through certain heat treatment to increase
The elasticity of latch needles; Through the fineness of special processing technique with raising pinhock, needle latch, shank.2. syringe
Syringe also is one of critical part of weft-knitting machine.Be divided into two kinds of integral type and inserted trick formulas by its version.At present, generally use the syringe of inserted trick formula on the knitting machine, but because the small-bore characteristics of medical internal metal rack knitting machine, we select the integral type syringe for use.
When design and test, we find, during braiding small diameter metal inner support, also exist following several problem:
(1) because the bore of inner support is too little, require the syringe barrel dliameter also very little.But on straight shape syringe, triangle
The reasonable arrangement of appropriate design and pin number has limited dwindling of syringe barrel dliameter.
When (2) on straight shape cyclinder needle loom, weaving because very big to the traction force of pipe, braiding be again soft
The property relatively poor tinsel, its rollback is less, thereby when moving back circle and knocking over certain difficulty is arranged.
(3) when the design triangle,, must reduce withdrawal of needle angle and pressing in order to reduce the impact force of triangle and knitting needle
Angle, but osculum the girth of shape syringe is little and limited this requirement straight.
At small-bore inner support, we consider the taper syringe.Its pluses and minuses are as follows:
(1) utilize the taper syringe to help reducing the braiding bore of inner support pipe.
(2) compare with straight shape syringe, easier the moving back of taper syringe enclosed and knocking over.
When (3) adopting the taper syringe, it is more convenient feasible that triangle is designed, rise cam and depressing cam
Angle can suitably be amplified.The taper syringe is because bigger at the height place of trigonum diameter, and developed surface is than broad,
Thereby do not resemble the straight shape syringe restricted.The triangle expansion radius of taper syringe is big, makes rise cam and pressure
Pin triangle angle when design can reduce, and has alleviated the percussion of triangle to knitting needle.
(4) taper syringe processed complex, difficulty of processing is big.The parameter designing of syringe and triangle and calculating are comparatively speaking
Also complicated.
Through repetition test and contrast, we finally select for use:
(1) the medical internal metal rack bore adopts the taper syringe below 5mm.
(2) the medical internal metal rack bore adopts straight shape syringe or taper syringe more than 5mm.
During the taper barrel design, the tapering of syringe is wanted rationally.Simultaneously, because the bore of syringe is little, in transmission the transmission wild effect can appear.Therefore adopt the mode that syringe is fixed, Triangulum rotates to weave.3. triangle
Because syringe is taper, triangle also is taper.For easy for installation, the outer surface of getting triangle is cylindrical, and the inner surface of triangle is taper.The developed surface of considering small-bore taper syringe is not very big, and we adopt the rise cam and the pressing auxiliary triangle of integral type.Can not rub when triangle is rotated, get syringe and triangle inner surface horizontal clearance Δ=0.3mm with syringe.Syringe is fixed on the frame, and triangle is fixed on the Triangulum, and Triangulum is driven and rotated by 76 tooth large toothed disks.Depressing cam can be done vertical adjusting, with regulating winding length.Convenient in order to adorn pin and to change pin, on depressing cam, open a breach.4. yarn guide
On small diameter metal inner support knitting machine, yarn guide has two effects: the one, and pad yarn, the 2nd, anti-needle latch backwash.Because syringe is taper, knitting needle also is a countersunk arrangement, thereby yarn guide also is taper.Its tapering is identical with syringe.The thickness of yarn guide is 2mm.The width of yarn guide is designed to: move back circle when knitting needle rises, when coil retreated on the needle latch spoon, yarn guide enters the operating position in case needle latch backwash and dropped stitch; When knitting needle descends when finishing the pad yarn and beginning to remain silent, the yarn guide position of deactivating.Yarn guide surrounds the central angle of syringe in 75 °, and maximum angle of contact is 120 °.5. send yarn, tractive and drive mechanism
(1) Yarn-feeding mechanism: adopt passive type to send the yarn mode.Tension compensating mechanism is installed on creel.
(2) draw-off mechanism: consider that tinsel is hard and smooth, after the braiding lopping, to leading of wire rack mount
Draw and batch the comparison difficulty, its flattening can not be changed the shape of support when batching, can not make again
It skids and influences and normally batch, and it is loose that wire rack mount is produced, so that cause and can not normally compile
Knit.Therefore, adopt passive type tractive mode, weight tractive at present in the test.
(3) drive mechanism: the electromotor → angular wheel → 76 tooth large toothed disk → Triangulums of band speed setting controller →
Triangle.(3) weaving method 1. braiding knitting cycles
The same with all knitted fabrics, the braiding of the niti-shaped memorial alloy inner support of latitude flat needle structure also will through moving back circle, fill up yarn, remain silent, knocking over, kinking, these stages of lopping.2. coil form
When selecting for use nitinol alloy wire to weave knitting medical stent, require the underfill coefficient of inner support very big, be beneficial to coil transfer and distortion to greatest extent under the low temperature state.Because the syringe needle diameter of the selected latch needles of knitting machine can not be very thick, make between two pins bigger at interval, and then the inner support that knits out, on the coil form, the sinker loop portion section of coil is big, needle loop portion section is little, as shown in Figure 2.Through test of many times, we finally take the crosspointer knitting skill, and promptly adjacent two pieces of pins weave a big coil simultaneously, make its needle loop portion section of resulting inner support and sinker loop portion segment length approaching, as shown in Figure 4.Coil transfer and the deflection of this support under low temperature state is big, respond well.3. normalized treatment before the alloy silk weaves and the annealing in process after the braiding
(1) normalized treatment
Involutory spun gold carries out normalized treatment, is about to the alloy silk and is heated to uniform temperature, cools off in air then.The place
The purpose of reason is that the organizational structure of metal is changed, and mechanical performance increases.After processing, big portion
Under the situation of branch, this alloy is the kinking lopping normally.But the lasting fracture of wire in the braiding process also can appear sometimes
Phenomenon, product quality are stable inadequately.
(2) annealing in process
Involutory spun gold carries out annealing in process, is about to the alloy silk and is heated to more than the critical temperature, through insulation after a while
After, in air, cool off again.This method can make the coarse grain refinement after forging, the casting processing,
With intensity, plasticity and the toughness that improves it, eliminate and forge, cast in the course of processing because inhomogeneous cooling and change
Uneven and the internal stress that causes of shape, can eliminate simultaneously foundry goods, forging in cooling procedure because cooling is too fast
The unbalance microstructure that causes, and then reduce its hardness.The annealing treating process that we take is: at metallographic
Be heated to 460 ℃ in the stove, be incubated 45 minutes and in air, cool off then.(4), the performance of knitted medical internal metal rack
The performance of the knitted medical internal metal rack of employing nitinol alloy wire braiding is as follows:
The product phase transition temperature that Ultimum Ti wove is 31 ℃, it can become tiny, soft in 0-4 ℃ frozen water, be convenient to the medical operation operation, and in the following shape that can return to original design of human body temperature (about 37 ℃), and corresponding generation restoring force, play the effect of expansion, support and drain.Because Nitinol has special shape memory function, outstanding super-elasticity, excellent abrasion resistance and corrosion resistance, good biocompatibility, it is good around Qu Xingneng to make by its medical stent of making, and can adapt to the natural torsion of tract.Can be covered by new epithelize after inserting, become an ingredient of tract.It has no side effect, and can be used as long-term intracanal scaffold, to treat tract narrow.
Compare with the medical internal metal rack that other method is produced, this product is mechanization production on a large scale, also has following advantage simultaneously:
● the inner support surface is difficult for causing the infection in the medical process without burr.
● the inner support tissue homogeneous degree is good, makes the restoring force uniformity of all directions, and it is expanded equably
Open in the human pipeline.
● the organizational structure of inner support can be so that this support clip becomes any Len req to insert human body.This support
Longer-term is placed in vivo, even lost efficacy, is broken into tinsel just by shirtsleeve operation or with it
Can take out easily, internally the damage of tract is minimum.This has extremely important meaning in clinical practice
Justice.
The effect that the present invention is useful reduces:
1. the knitted medical inner support is selected the niti-shaped memorial alloy silk for use, its medical performance, bio-compatible
The property good, simultaneously it also have super-elasticity, in light weight, corrosion resistance strong and resisting fatigue, resistance to compression, anti-
Draw characteristics such as performance is good, be applicable to human body fully.
2. with the knitted medical inner support of niti-shaped memorial alloy silk braiding, become below 10 ℃ tiny,
Easy shape of placing.Place in the body, rely on the heating of body temperature or external source, it will restore to the original state voluntarily,
Support human body interior conduit is also combined closely with it, guarantees that it is unimpeded.This supporting structure good evenness, expansion
The time all directions the restoring force uniformity, can be applicable to human pipeline's expansion fully.This product can
Be cut into random length as required.After using, can in human body, get easily human body simultaneously through breaking
Go out, reduce patient's misery of repeatedly performing the operation.
3. the particular design of straight shape syringe, the small-bore knitting machine of taper syringe can adapt to niti-shaped memorial alloy
The characteristics that big, the rigidity of silk hardness is big, bending property is poor, percentage elongation is little, the inner support bore is little etc., energy
Knit out the knitting inner support pipeline that meets the medical operation requirement.
4. adopt the crosspointer knitting skill, can make the inner support that is woven have uniform loop construction, the coil sedimentation
Arc and needle loop portion section plesiomorphism, the distortion and the metastasis degree of inner support coil are big, thereby in being beneficial to
The implant procedure in the medical operation process is convenient in distortion to greatest extent under the support low temperature state.
5. the braiding parameter in the knitted medical internal metal rack braiding process has directly inner support bore and coil form
Connect influence.Generally speaking, when the alloy silk is thin and when soft, can normally weave under the prerequisite, can adopt
With less tractive tension force with to yarn tension, inner support softness and coil good evenness.But when the alloy silk
When diameter is thick, can strengthen tractive tension force to improve its knitting property.
In a word, product of the present invention is that structure or material all are fit to medical requirement, and its prospect very
Optimistic.
Claims (8)
1, a kind of knitted medical internal metal rack, it is the inner support pipe that the niti-shaped memorial alloy silk is formed, and it is characterized in that the inner support shape that the niti-shaped memorial alloy silk is formed is a cylindrical shape, the inner support structure is knitting latitude plain construction.
2, knitted medical internal metal rack according to claim 1, it is characterized in that described niti-shaped memorial alloy silk knit latitude plain construction inner support even structure degree is good, coil sinker loop portion section (1) and needle loop portion section (2) plesiomorphism, length is close.
3, knitted medical internal metal rack according to claim 1 and 2 is characterized in that the flat pin internal metal rack of described niti-shaped memorial alloy silk knit latitude bore can be at 3mm～28mm.
4, knitted medical internal metal rack according to claim 3 is characterized in that used niti-shaped memorial alloy silk nickel content is 54～56%.
5, a kind of manufacture method of claim 1～4 knitted medical internal metal rack, employing weaves on the knitting machine of special use, braiding niti-shaped memorial alloy inner support also will through moving back circle, fill up yarn, remain silent, knocking over, kinking, these stages of lopping, it is characterized in that: take the crosspointer knitting skill, be that adjacent two pieces of pins weave a big coil simultaneously, make its needle loop portion section of inner support and the sinker loop portion segment length of gained approaching, coil transfer and deflection under low temperature state are big.
6, the manufacture method of knitted medical internal metal rack according to claim 5, needing it is characterized in that preceding normalized treatment of involutory spun gold braiding and the annealing in process after the braiding, it promptly is that the alloy silk is heated to uniform temperature that involutory spun gold carries out normalized treatment, in air, cool off then, annealing in process promptly is that the alloy silk is heated to more than the critical temperature, through in air, cooling off again after the insulation after a while, annealing treating process is: the alloy silk is heated to 460 ℃ in the metallographic stove, insulation is 45 minutes in stove, cools off in air then.
7, the manufacture method of knitted medical internal metal rack according to claim 5 is characterized in that: A) adopt to strengthen traction force and frequently on pin the method for oiling agent make to move back and be not prone to needle latch backwash phenomenon when enclosing; B) because of the rigidity of nitinol alloy wire big, not yielding, caused the normally knocking over of old coil, choose tongue and go up high higher latch needles again, increase coil when helping weaving and be convenient to transfer between the coil, help knocking over, pretreatment guaranteed the smooth knocking over of alloy silk to reduce its rigidity before the alloy silk was woven;
8, the special equipment of a kind of knitted medical internal metal rack product and manufacture method, it is characterized in that special equipment is custom-designed knitting machine, syringe bore scope is at 5mm～30mm, the preferential taper syringe that adopts, adopt one tunnel cam system, when weaving the medical internal metal rack bore when 5mm is following, adopt the taper syringe; The internal metal rack bore adopts straight shape syringe or taper syringe when 5mm is above.
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