CN1939550A - Fabric reinforcing tube and its production - Google Patents

Abstract

A braided material reinforced tube with soft surface, high strength and low ductility for medical purpose has the reinforcing ribs made of the filament braided substance. One or more resin layers are used to cover on the internal and/or external surfaces of said braided substance. Its preparing process is also disclosed.

Description

A kind of fabric reinforcing tube and preparation method thereof

Technical field

The present invention relates to medical treatment and go up the reinforced pipe that uses, relate in particular to a kind of fabric reinforcing tube.

Background technology

Along with the development of Wicresoft's interventional therapeutic technique, also more and more higher to the requirement that gets involved the various conduits that equipment uses.Be used to carry the induction system of self-expanding stent class interventional therapy equipment more special to the requirement of epitheca pipe, be similar to guiding catheter; thin-walled can reduce the conduit external diameter; thus operation wound reduced; and thin-walled also can enlarge inner chamber in addition; also require epitheca pipe softness in addition, arrives focus so that pass through tortuous blood vessel; As the sheath pipe of self-expanding stent induction system, requiring has enough radial and axial intensity, so that when being subjected to stretching or when being subjected to the expanded radially power of support, do not produce elongation strain basically, with synchronicity and the reliability that guarantees that support discharges.

Such as the polyimide hard material, though can be processed into ultra-thin-wall tension sheath pipe, coefficient of friction is also lower, and its easy discounting really up to the mark is not suitable for use in the sheath pipe.U.S. Patent number be US5954651 patent disclosure a kind ofly do reinforcement with fabric, skin is extruded the reinforced pipe that soft macromolecular material is made within it simultaneously, present this technology is very ripe, and also is applied in many interposing catheters, as angiography catheter.Because the fabric in the reinforced pipe is formed by metal wire knitted usually at present, basketwork structure is adjusted angle of weave to adjust braiding speed with a silk rotary speed, reinforced wire that obtains like this and tubing axially have certain angle (acute angle), the reinforced pipe that obtains so often is difficult to bear the mechanical load that self-expanding stent applies, and influences the product serviceability.Self-expanding stent compresses the induction system sheath pipe front end of packing into special equipment when apparatus is produced, the self-expanding stent after the compression gives tubing all the time radially with bigger expansive force in the storage life like this, and this expansive force also can increase when high temperature; In the operation, after the support that places system in advance sent to focus, need support be ejected the sheath pipe with the push rod of apparatus, support will be converted into the axial tensile force that puts on the sheath pipe by the frictional force between sheath pipe and support (or push rod) to the bigger expansive force of sheath pipe this moment, the stress of this both direction all proposes bigger challenge to the non-deformability of sheath pipe, because the trend of actual two stress directions that apply and sheath pipe reinforcement has certain angle, at this moment the bond properties of reinforcement and macromolecule layer becomes the key of sheath pipe non-deformability.And the bonding force between macromolecular material and metal material is less usually, and therefore this basketwork structure is difficult to play due reinforcement effect.In order to improve the intensity of tubing, have to increase the size of reinforcement and the wall thickness of macromolecule layer, so just make that the wall thickness of sheath pipe can not be too thin.

In addition, in order to guarantee the intensity of metal reinforced wire, what be difficult to do is very thin, and fine wire at present commonly used is 0.001 * 0.003 inch a flat filament; Tinsel is done reinforcement, and ectonexine must expose the stimulation that causes blood vessel to avoid tinsel by the coated high molecular material.So also be difficult to wall thickness is subtracted, the reinforced pipe wall thickness that this method obtains is usually more than 0.2 millimeter.The patent application of Application No. 20040089969 proposes elder generation to the reinforced wire coating, then only at outer extruding macromolecular layer, owing to reduced internal layer, can do thin.Clearly, this have only one deck resin bed and reinforcement bonding, and its adhesion strength can be very not high, and non-deformability has just reduced.

The fibrous silk that the patent application of Application No. 20040181208 proposes to adopt a kind of yield strength to be higher than common reinforced wire 20～40% is done reinforcement, to reduce wall thickness and elongation.But this high-intensity fiber shape silk is a kind of clad metal wire in fact, although can reduce wall thickness and elongation to a certain extent, effect is also not obvious, and with the common metal reinforced wire identical shortcoming is arranged, promptly can not expose the reinforced wire mechanical load of failing effectively to bear.

Do reinforcement because tinsel is harder with metal knitted webmaster, although can coat by inside and outside resin bed, but need one section pure high molecular tubing of welding in addition usually at sheath tube end (particularly near-end), patent application as Application No. 20050010194 proposes, after extruding the ground floor resin, length is blocked on demand, when extruding second layer resin, exceeds reinforcement and forms a no reinforcement section naturally for then.Clearly, no matter adopt which kind of method, doing reinforcement with tinsel all needs the termination is coated processing especially, has increased technology and cost so undoubtedly.In addition, the coated high molecular resin usually adopts softer model, no reinforcement section self intensity and and the intersegmental bonding strength of reinforcement all to contain the intensity of reinforcement section low, these parts often become the weak link that ruptures take place when stressed in the use.

In addition, adopt tinsel to do reinforcement, carry out different tubing when connecting by thermal weld, tend to because of being heated tinsel be exposed, existence wiry has also influenced the development effect of support to a certain extent, and this also proposes very big challenge for connection technology.

Summary of the invention

The present invention is in order to solve above-mentioned the deficiencies in the prior art part, proposed a kind ofly can effectively reduce wall thickness, easy to process, soft, fabric reinforcing tube that high-strength low-ductility is stretched.

A kind of fabric reinforcing tube of the present invention comprises the reinforcement that the fiber filament fabric is made, and is coated with resin bed at the internal layer of described reinforcement, and described resin bed is one or more layers.

Skin at described reinforcement is coated with resin bed, and described resin bed is one or more layers; Described fiber filament fabric is made by HMLS fiber type long filament, and for materials such as PFY PET, polypropylene filament yarn PP, Tynex NYLON, chinlon, carbon fiber any, described fiber filament axially and is radially arranged to be basically parallel to reinforced pipe.

The preparation method of described fabric reinforcing tube is as follows: the organizine along described reinforced pipe axial arranging is alternately opened, and tram then with angle in the organizine opened the spiral winding radially minimum with described reinforced pipe, is made reinforcement; Internal layer at reinforcement, by extrude, any mode of coating, heat bonding, coat one or more layers of resin bed, the different sections of every layer or every layer are different resin beds, press any of fluorine material macromolecule resin of polyimide resin POLYIMIDE, polytetrafluoroethylene PTFE for polyethers-amino block copolymer resin PEBAX, nylon resin NYLON, polyamides; Skin at reinforcement, by extrude, any mode of coating, heat bonding, the different sections of every layer or every layer are different resin beds, are any of the fluorine material macromolecule resin of polyethers-amino block copolymer resin PEBAX, nylon resin NYLON, polyimide resin POLYIMIDE, polytetrafluoroethylene PTFE.

The invention has the advantages that:

(1) because the macromolecule long filament than the tinsel softness, and can not stimulate blood vessel when exposed, so just can only coat one deck high stratification in interior or outside as required, help reducing wall thickness;

(2) because when thermal weld, tend to because of resin-coated contraction causes wiry exposing, and, can carry out hot perforate for the fiber filament reinforcement, processing is just more convenient like this;

(3) because reinforcement is distributed by force direction along radial and axial two of tubing, can effectively bear pressure, the tubing that therefore obtains has high-strength low-ductility and stretches performance.

Description of drawings

Fig. 1 is parallel to axial, the radial weaving method sketch map of reinforced pipe;

Fig. 2 is alternative one on the other braiding structure sketch map;

Fig. 3 is two times alternative braiding structure sketch maps on two;

Fig. 4 be on two two times alternately, the braiding structure sketch map that angle is 20 °.

The specific embodiment

Fabric reinforcing tube of the present invention is to be reinforcement with the fiber filament fabric, fiber filament can be made by PFY PET, polypropylene filament yarn PP, Tynex NYLON, chinlon or other macromolecular materials, because the macromolecule long filament is than the tinsel softness, and when exposed, can not stimulate blood vessel, therefore can be as required only coat one deck macromolecule layer, help reducing wall thickness at the internal layer or the skin of reinforcement.Particularly the end if resin-coated hardness can be accepted, then need not to weld soft head in addition, or additionally extrudes one section bulk resin when extruding.In addition, the also more metal knitted net reinforcement of perforate thermal weld is feasible, because during thermal weld, tends to cause wiry exposedly because of resin-coated contraction, and for the fiber filament reinforcement, can carry out hot perforate.

For reinforced pipe as conveying self-expanding stent sheath pipe, in order to guarantee that support discharges synchronicity, often need the sheath pipe in the scope that meets with stresses normally, elongation strain not to take place, promptly need be under less stress condition the almost not elongation of sheath pipe, or the stress that needs when less elongation takes place is bigger.HMLS fiber type long filament promptly is a kind of high polymer long filament of this performance of tool, it is the long filament that a kind of polymer that adopts higher molecular weight obtains by abundant drawing-off, strand is abundant along the long filament axial orientation, can equally with tinsel show good non-deformability when stressed, but more soft than tinsel.

The fabric fiber filament of reinforcement is arranged to be parallel to the axial and radial direction of tubing, be parallel to the axial and radial fiber filament of reinforced pipe and can adopt different weaving version, but trend keeps the axial or radial parallel with reinforced pipe basically, and needed Density is stressed with reinforced pipe and the fiber filament modulus is directly related.When having born that support discharges, the fiber filament of reinforced pipe axial arranging transfers to axial tensile force on the sheath pipe because of frictional resistance between support and sheath pipe; The radial support power that when fiber filament of radially arranging along reinforced pipe is then being born the support that is compressed in the sheath pipe and expanded the reinforced pipe sidewall is being produced.Because the stress on the both direction is directly born by fiber filament, there is not force resolution, therefore to resin-coated intensity particularly the bonding strength between resin and reinforcement is less demanding, so just can suitably select the resin or the attenuate resin bed of the soft trade mark, also just can obtain the softish reinforced pipe of ultra-thin-wall.

Be parallel to reinforced pipe axially or the basketwork structure of radially arranging can adopt mode shown in Figure 1 to weave to obtain, organizine 1 along the reinforced pipe axial arranging is alternately opened with ad hoc fashion, 2 of trams are to twine with the radially minimum angle spiral in the organizine of opening 1 of reinforced pipe, and the size of reinforcement fabric depends on the size of used lining plug 3.

Above-mentioned be raw material with HMLS fiber type long filament, according to being parallel to reinforced pipe axially or on the reinforcement that weaves of radial direction, can by extrude, mode such as coating, thermoplastic or two or more modes be combined in interior or (with) the outer resin bed that coats one or more, thickness that can be by regulating macromolecular material and hardness etc. are with pipe suitable intensity and the hardness of being strengthened.Extrude to coat and be about to be expressed into the method that forms clad on the reinforcement after resin becomes melt by the extruder melting; Coating coats soon, and resin solution is coated with (or cover, or transfer covers) on reinforcement, but resin solvent volatilization or temperature reduce the method for back formation clad; The plastic tubing that is about to process of thermoplastic is enclosed within on the reinforcement, heating make and cover after half melting of tubing part on reinforcement (need the overcoat thermoplastic tube usually, so as to coat after the tubing melting more closely knit evenly).Every layer of resin bed can adopt different macromolecular materials, and every layer different sections also can adopt different resin materials so that obtain the optimum transfer combination of different performances such as hardness.

Because fiber filament is low than softness and coefficient of friction, will as reinforcement fabric fully encrypt after, can reduce the resin-coated number of plies, only coat even not resin-coated layer of one deck; Adopt ciphering type fabric reinforcement can also increase the intensity of reinforced pipe in addition, under flexibility acceptable prerequisite, count is the bigger the better.Adopt the ciphering type reinforcement, reduce the resin-coated number of plies after, not only can effectively reduce the thickness of reinforced pipe, can also simplify reinforced pipe preparation technology.

Although the thickness of resin-coated layer and the bonding strength between resin bed and the reinforcement are not the main aspects of decision reinforced pipe intensity, but fusing point near and can guarantee that a little less than the resin of reinforcement fiber filament fusing point adding man-hour at clad does not influence the intensity of reinforcement fiber filament, thereby guarantee the final performance of reinforced pipe.

Therefore fabric reinforcing tube of the present invention is easy to process, has softness, ultra-thin-wall, high-strength low-ductility and stretches, and is fit to advantages such as thermal weld processing, can be widely used as various interposing catheters, particularly the sheath pipe field that thin-walled, softness, low elongation are had relatively high expectations simultaneously.

It is to be noted that the HMLS fiber type long filament of mentioning among the present invention is not limited to the specific material of a certain or a certain class, be parallel to axial, the radial reinforcement fiber filament of reinforced pipe respectively and distribute and also be not limited to certain specific braiding structure type.

Illustrate that with specific embodiment the present invention can reach effective effect below.

The parameter test method and the equipment that are adopted among the embodiment are as follows:

Load: adopt INSTRON 5543 omnipotent stretching-machines, draw speed 300mm/min;

Coefficient of friction: adopt the MXD-01 friction coefficient instrument, test speed 100mm/min, slide block quality 100 grams.

Embodiment 1:

The used fiber filament specification of reinforcement: diameter 0.025mm, the ultra-fine high-strength flatness fiber filament of PET, extension at break: 6%, fracture strength 7.0CN/dtex; Count and structure: PPI:246, braiding structure are illustrated in figure 2 as one on the other and replace; Reinforcement size: internal diameter: 1.60mm, external diameter 1.74mm; Resin-coated coating mode: thermoplastic only coats at skin; Overcoat thermoplastic tubing: Pebax7033, internal diameter: 1.80mm, wall thickness 0.06mm.

Result of the test:

Gained pipe performance parameter
						Axial load (N)		Radial load (N)		Inwall coefficient of friction (with metal)	Total wall thickness
The @1% elongation	The @ fracture	The @1% elongation	The @ fracture
				55	68	52	65	0.08	0.13mm

Conclusion: adopt ciphering type fabric reinforcement, not only can guarantee gained tubing radially, axial strength, and internal layer need not resin-coated layer, skin can be by the resin-coated layer of thermoplastic mode, technology is very simple, radially, the reinforcement that axially gathers effectively bearing mechanical load, can reach also on-deformable purpose under the big stress.

Embodiment 2:

The used fiber filament specification of reinforcement: diameter 0.025mm, the ultra-fine high-strength flatness fiber filament of PET, extension at break: 6%, fracture strength 7.0CN/dtex; Count and structure: PPI:246, braiding structure are illustrated in figure 2 as one on the other and replace; Reinforcement size: internal diameter: 1.60mm, external diameter 1.74mm; Resin-coated coating mode: skin is extruded; Resin material: Pebax7033, resin-coated wall thickness 0.05mm.

Result of the test:

Gained pipe performance parameter
						Axial load (N)		Radial load (N)		Inwall coefficient of friction (on the metal)	Total wall thickness
The @1% elongation	The @ fracture	The @1% elongation	The @ fracture
				59	73	55	68	0.08	0.10mm

Conclusion: adopt ciphering type fabric reinforcement, not only can guarantee gained tubing radially, axial strength, and internal layer need not resin-coated layer, outer by the resin-coated layer of extrusion way, can obtain thin wall thickness and guarantee wall thickness accuracy, radially, the reinforcement that axially gathers effectively bearing mechanical load, can reach also on-deformable purpose under the big stress.

Embodiment 3:

The used fiber filament specification of reinforcement: diameter 0.025mm, the ultra-fine high-strength flatness fiber filament of PET, extension at break: 6%, fracture strength 7.0CN/dtex; Count and structure: PPI:64, braiding structure are illustrated in figure 3 as on two two times alternately; Reinforcement size: internal diameter: 1.60mm, external diameter 1.74mm; Resin-coated coating mode: skin is extruded, and the internal layer coating coats outermost resin: Pebax7033, thickness 0.05mm, internal layer: PTFE, wall thickness 0.03mm.

Result of the test:

Gained pipe performance parameter
						Axial load (N)		Radial load (N)		Inwall coefficient of friction (with metal)	Total wall thickness
The @1% elongation	The @ fracture	The @1% elongation	The @ fracture
				41	48	39	44	0.02	0.13mm

Conclusion: internal layer is done the PTFE coating, have lower coefficient of friction,, decrease even load is compared withembodiment 1,2 although count is not high, but be parallel to radially, axial reinforced wire distributes and effectively born stress loading, the load during little deformation is still very high.

Comparative Examples:

The used metal reinforced wire of reinforcement: the 304s.s of 0.025mm * 0.075mm; Count and structure: PPI:64, braiding structure are illustrated in figure 4 as on two two times alternately, 20 ° of angles; Reinforcement size: internal diameter: 1.60mm, external diameter 1.74mm; Resin-coated coating mode: skin is extruded, and the internal layer coating coats; Outermost resin: Pebax7033, thickness 0.05mm, internal layer: PFA, wall thickness 0.03mm.

Result of the test:

Gained pipe performance parameter
						Axial load (N)		Radial load (N)		Inwall coefficient of friction (on the metal)	Total wall thickness
The @1% elongation	The @ fracture	The @1% elongation	The @ fracture
				12	44	9	48	0.02	0.13mm

Conclusion: with tinsel routinely the fabric made of braiding structure make reinforcement, although its breaking load (fracture strength decision wiry is arranged) is not low, be very easy to distortion.The mechanical load direction of arranging and bearing that mainly is reinforced wire has certain angle, can not effectively bear due to the stress.

Claims (5)

1. a fabric reinforcing tube is characterized in that, comprises the reinforcement that the fiber filament fabric is made, and is coated with resin bed at the internal layer of described reinforcement, and described resin bed is one or more layers.

2. a kind of fabric reinforcing tube according to claim 1 is characterized in that, is coated with resin bed at the skin of described reinforcement, and described resin bed is one or more layers.

3. a kind of fabric reinforcing tube according to claim 1 and 2, it is characterized in that, described fiber filament fabric is made by HMLS fiber type long filament, for materials such as PFY PET, polypropylene filament yarn PP, Tynex NYLON, chinlon, carbon fiber any, described fiber filament axially and is radially arranged to be basically parallel to reinforced pipe.

4. the preparation method of the described a kind of fabric reinforcing tube of claim 1 is characterized in that, alternately opens along the organizine of described reinforced pipe axial arranging, and tram then with angle in the organizine opened the spiral winding radially minimum with described reinforced pipe, is made reinforcement; Internal layer at reinforcement, by extrude, any mode of coating, heat bonding, coat one or more layers of resin bed, the different sections of every layer or every layer are different resin beds, are any of the fluorine material macromolecule resin of polyethers-amino block copolymer resin PEBAX, nylon resin NYLON, polyimide resin POLYIMIDE, polytetrafluoroethylene PTFE.

5. the preparation method of a kind of fabric reinforcing tube according to claim 4, it is characterized in that, skin at reinforcement, by extrude, any mode of coating, heat bonding, coat one or more layers of resin bed, the different sections of every layer or every layer are different resin beds, are any of the fluorine material macromolecule resin of polyethers-amino block copolymer resin PEBAX, nylon resin NYLON, polyimide resin POLYIMIDE, polytetrafluoroethylene PTFE.

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