CN101933855B - Recyclable vascular stent and recycling method thereof - Google Patents
Recyclable vascular stent and recycling method thereof Download PDFInfo
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- CN101933855B CN101933855B CN2010102656106A CN201010265610A CN101933855B CN 101933855 B CN101933855 B CN 101933855B CN 2010102656106 A CN2010102656106 A CN 2010102656106A CN 201010265610 A CN201010265610 A CN 201010265610A CN 101933855 B CN101933855 B CN 101933855B
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Abstract
The invention discloses a recyclable vascular stent and a recycling method thereof. The vascular stent comprises a tubular netted framework woven by silks, the end part of the stent is provided with a connecting structure, and the connecting structure forms separable connection with a stent conveyor; the stent can be arranged in the stent conveyor, and can be restored to the original shape after being released; and net holes on the part of the connecting structure are more loosen than other grids, and are used for repeatedly positioning and/or recycling the stent in a vascular cavity. The netholes positioned on the connecting structure on the end part of the stent are easier to stretch and deform than other net holes at other positions, the connecting structure is folded and pulled into a sheath catheter of the stent conveyor, and the rest part of the stent is also collected in the sheath catheter of the stent conveyor, so an operator is greatly convenient to adjust the form of the stent and adjust the proper position of the stent in the vascular cavity and even recycle the stent from the vascular cavity, the repeated positioning and smooth recycling of the vascular stent are realized, and the technical requirement of PTA therapy is better met.
Description
Technical field
The present invention relates to treat or the medical instruments field of auxiliary treatment angiopathy aspect, in particular, improving what relate to is a kind of callable intravascular stent and recovery method thereof.
Background technology
Along with the change of therapeutic treatment pattern and the raising of people's living standard, obvious difference has also appearred in the kind of disease and frequency of disease development, and especially the sickness rate of angiopathy presents the trend that rises year by year.
Angiopathy can be divided into arteries disease and vein blood vessel disease according to vessel position, wherein: described arteries disease can be subdivided into again expanding arteries disease and inaccessible type arteries disease, and described vein blood vessel disease can be subdivided into again Vein reflux type disease and vein stops up sick; Described angiopathy can be divided into congenital angiopathy and wound angiopathy according to the morbidity cause, wherein: described congenital angiopathy can be subdivided into deformation, venous malformation and hemangioma again, and described wound angiopathy can be subdivided into again artery trauma, vein wound and arteriovenous associating wound.
traditional vascular operation mode, the mode by direct incision lesion vessels reaches the purpose for the treatment of angiopathy, because patient's majority of angiopathy is old patient, its health is often comparatively weak, be difficult to bear the huge operation wound that traditional vascular operation is brought, so in recent years, the therapeutic modality of the angiopathy Endovascular therapy mode from traditional vascular operation mode to Wicresoft changes, for example, the puncture shaping surgery PTA that last century, the nineties began progressively to carry out in the world (Percutaneous Transluminal Angiography, the Percutaneous intravascular angioplasty), namely under the guiding of medical imaging device, by little otch, the intravascular intracavity is sent into special metal rack, the disease that is used for the treatment of blood vessel, reach the therapeutic effect the same with the surgical sectioning operation, and can greatly reduce hemorrhage and complication, shorten recovery time.
Can a large amount of use various supports in different therapeutic processes, these supports can be transported to by conduit the diseased region of blood vessel, such as: the abnormal vascular such as angiostenosis, hemangioma, arteriovenous fistula place; Support of the prior art mostly is the tubular bracket of cut, although the network of metal wire knitted is also arranged, yet actual surgery situation is sometimes comparatively complicated, form and the position of most supports after release is unsatisfactory, can't satisfy the requirement for the treatment of itself, often need first to be recovered in conduit or sheath pipe and carry out second positioning and release.
But, but the support that has at present can not be realized recyclable and function resetting; And have can only realize partially recycled function, but can't satisfy other requirement, for example, the closed loop tubular bracket of cut, just can't be recovered in conduit again in case discharge fully, and the non-constant of its bending property, can not use in the blood vessel of extremity or bending; The support that also has draws in together by some sleeve pipes, and an end is fixed with the nut of metal, is connected with push rod, tinsel and sleeve pipe all easily are deposited in nut end when reclaiming, produce very large resistance, need to adopt thicker conduit could realize reclaiming, be not suitable for using in less blood vessel.
Therefore, prior art still haves much room for improvement and develops.
Summary of the invention
The object of the invention is to, a kind of callable intravascular stent is provided, form and position after its release of capable of regulating are realized the resetting of intravascular stent and are reclaimed smoothly function, to satisfy the requirement of PTA treatment.
Technical scheme of the present invention is as follows:
A kind of callable intravascular stent comprises a pipe type netted skeleton that is woven into silk, and the one end arranges a syndeton, is used for forming disengageable the connection with a bracket conveyer; Described support can be packed in described carrier, and described support can restore to the original state after discharging from described bracket conveyer; Described syndeton comprises plural protuberance, and described protuberance is evenly distributed on the periphery of described support one end; Wherein: each protuberance comprises a mesh, is used for connecting described bracket conveyer; Each protuberance is made of individual thread; The average-size of the mesh of described protuberance, average-size greater than other position mesh on described skeleton, can with an end of the described bracket conveyer of described support income, be used in the lumen of vessels resetting and/or reclaim described support by described gathering syndeton.
Described callable intravascular stent, wherein: be provided with the latch closure that adaptive described bracket conveyer connects on described protuberance.
Described callable intravascular stent, wherein: cross sections different on described support is adhered on the summit of described protuberance separately, consists of multistage braided support.
Described callable intravascular stent, wherein: be provided with latch closure on the second-order protuberance of described multistage braided support, the first rank silk of described multistage braided support passes described latch closure.
Described callable intravascular stent, wherein: at the other end of described support, adjacent two rhizoids mutually are wound around and are a pigtail shape knot.
Described callable intravascular stent, wherein: on the surface of described support, the choked flow film is set.
a kind of callable intravascular stent provided by the present invention, because having adopted, the end at support weaves to get relatively loose syndeton, and form disengageable the connection with bracket conveyer, by drawing described syndeton in and drawing in the sheath pipe of described bracket conveyer, the remainder of support also can be taken in described bracket conveyer sheath pipe, greatly facilitate the form that the operator adjusts described support, and adjust the correct position of described support in lumen of vessels, or even described support is reclaimed from lumen of vessels, realize the resetting of intravascular stent and reclaimed smoothly function, thereby satisfied preferably the specification requirement of PTA treatment.
Description of drawings
Fig. 1 is the single order intravascular stent axonometric chart in the embodiment of the present invention 1;
Fig. 2 is the single order intravascular stent axonometric chart that has closing in the embodiment of the present invention 2;
Fig. 3 is the multistage intravascular stent axonometric chart in the embodiment of the present invention 3;
Fig. 4 is with the multistage intravascular stent axonometric chart of latch closure in the embodiment of the present invention 4;
Fig. 5 is the multistage intravascular stent axonometric chart of tying with the pigtail shape in the embodiment of the present invention 5;
Fig. 6 adopts sub-thread to reclaim the process schematic diagram that silk reclaims intravascular stent in the embodiment of the present invention 6;
Fig. 7 adopts in the embodiment of the present invention 7 with the recovery silk of draw ring and the process schematic diagram of fixing silk recovery intravascular stent;
Fig. 8 adopts the bifilar process schematic diagram that silk reclaims intravascular stent that reclaims in the embodiment of the present invention 8;
Fig. 9 adopts the process schematic diagram that reclaims intravascular stent with the recovery silk of a plurality of hooks in the embodiment of the present invention 9;
Figure 10 adopts the process schematic diagram that reclaims intravascular stent with the bridle catcher of bayonet unit in the embodiment of the present invention 10;
Figure 11 adopts closed circle and is with the recovery silk of linking up with to reclaim the process schematic diagram of intravascular stent in the embodiment of the present invention 11.
The specific embodiment
Below with reference to accompanying drawing, the specific embodiment of the present invention and embodiment are described in detail.
A kind of callable intravascular stent of the present invention, one of its specific embodiment as shown in Figure 3, comprises a pipe type netted skeleton, described support can adopt single or many one metal wire braidings to form, and also can adopt to have the stronger nonmetal wire braiding composition of rebound performance.Support can be compressed, removes after external force resilient again.Arrange one at the initial braiding end of described support and have the syndeton of relatively loose mesh, be used for disengageable connection of formation between described support and a bracket conveyer.This syndeton place is provided with a plurality of mesh, described mesh is more loose than other mesh on described support, that is to say, be positioned at the average-size of syndeton on described skeleton place mesh, average-size greater than other position mesh on described skeleton, and, External Force Acting the former than latter's distortion that more easily is stretched.Described support can be drawn in and from an end retraction of described bracket conveyer by described syndeton.The shape of described syndeton can the conversion setting with the action of the recovery structure on described bracket conveyer, be that syndeton can be drawn in and be drawn in the sheath pipe of described bracket conveyer, also can be pushed out the sheath pipe and expand reinstatement, so that resetting and/or reclaim described support in lumen of vessels.
Correspondingly, the recovery method of a kind of intravascular stent of the present invention, one of its specific embodiment comprises and reclaims the pipe type netted skeleton that forms with metal wire knitted that the one end arranges a syndeton, is used for forming disengageable the connection with a bracket conveyer.Described support can be packed in described carrier, and described support can restore to the original state after discharging from described bracket conveyer.Wherein: the average-size that is positioned at syndeton on described skeleton place mesh, average-size greater than other position mesh on described skeleton, described support can be drawn in and from an end retraction of described bracket conveyer, be used in the lumen of vessels resetting and/or reclaim described support by described syndeton.As shown in Figure 6, adopt described recyclable intravascular stent and a bracket conveyer; Described bracket conveyer comprises a recovery structure, and described recovery structure comprises a sheath pipe, a push rod and adapter, and described push rod and adapter all pass described sheath pipe.First the recovery structure with described bracket conveyer is connected with the syndeton of described support, entangles the mesh of described syndeton by the adapter of described recovery structure, makes an end of support and described recovery structure be in connection status.Then by the recovery structure on the described bracket conveyers of action such as drawing, pull, carry, drag of appropriate strength, draw described syndeton in and it is drawn in the sheath pipe of described bracket conveyer, described syndeton and then the remainder of described support is brought in the sheath pipe, move described push rod, described support is released the sheath pipe, keep described connection status.The described recovery structure that will move coordinates and carries out with the described push rod of action, with resetting in lumen of vessels and the described support of recovery.
In the preferred embodiment of the callable intravascular stent of the present invention and recovery method thereof, described support can adopt one or more tinsel and the mould rod that big or small length is suitable, first weaves the structure that forms again grid duct shape through Overheating Treatment.Described mould rod surface is provided with a plurality of nearer fixtures apart, and tinsel is hung on these fixtures, holds the two ends of every one metal wire, and described support takes up one's knitting on the mould rod.Described tinsel begins to be staggered into grid after turning back on fixture, relatively will loosen at the mesh of the initial braiding end of described support.The grid that these edges are outstanding forms the syndeton with mesh, is used for being connected with bracket conveyer, realizes in lumen of vessels resetting and/or reclaims described support.Described support can be hung the mode of silk and the difference of position possesses slightly differentiated multiple syndeton because of when braiding, as single order braided support or multistage braided support, to adapt to connected modes different in practical situation and/or way of recycling.String diameter scope wiry used can be between 0.01mm～0.8mm, and its number can be that odd number can be also even numbers; On described support, the acute angle angular range of grid can be between 5 ° to 90 °; The length range of described support can be 5～500mm, and diameter range can be 1～50mm.The weaving manner of described support can be the longitude and latitude weaving, and a rhizoid is pressed another rhizoid, can be also that a rhizoid is pressed another two rhizoids, or two rhizoids is pressed another two rhizoids.
Preferably adopt the super-elastic shape memory alloy material, such as nitinol alloy wire etc., to guarantee the superior elasticity of described support, have good radial support performance and axial bending performance after release.First the nitinol alloy wire with suitable string diameter is woven into the required pipe type netted structure that comprises syndeton, reaches the required length of support, more after heat treatment support has and the corresponding stable diameter of mould rod, then takes off support from the mould rod.Described support has good radial support and axial bending, to be adapted at the vascular lesion position use of crooked position.In addition, the processing of can closing up of the tail end of described support to avoid occurring the phenomenon of filoselle in the process of folding and unfolding repeatedly, also can avoid tinsel to stab blood vessel, and the mode of closing in has back volume, welds, plaits the hair/spring and binding binding etc.In addition, also can carry out overlay film to described support and process, for example, the choked flow film is sewed up or sintering on wire netting, guarantee that blood flows through from the inner chamber of described support, the effect that completely cuts off with the blood vessel that plays blood and pathological changes.The material of choked flow film can be PTFE (Poly tetra fluoro ethylene, politef), PET (Polyethylene terephthalate, polyester), PE (Polyethylene, polyethylene), nylon, polyurethane, latex or silica gel etc.
Syndeton because described support has a braiding to form can be connected reliably with described bracket conveyer, realizes the function that pushes and/or reclaim.The function that pushes reclaims comparatively simple relatively, a push rod is set in the sheath pipe of described bracket conveyer can realizes the function that pushes.In the different specific embodiment, described push rod can have different structure, can be solid hopkinson bar, can be also the pipe that hollow connects.And the realization of reclaiming function is more diversified, it is different from the adapter connected mode of the recovery structure of described bracket conveyer that its main variation is, specifically can roughly be divided into and flexibly connect and be rigidly connected, described flexible connection mode comprises that snare connects and be connected and connects etc., and described being rigidly connected comprises the buckle connection and be threaded etc.But no matter be any connected mode, described support is in the process that reclaims, and all the syndeton of support is first drawn in before this, then is drawn in described sheath pipe, and then, the remainder of support is also drawn in the sheath pipe.Below, illustrating in the mode of embodiment, the technical characterictic between embodiment allows combined crosswise to consist of new technical scheme.
Embodiment 1:
As shown in Figure 1, can bore at the sustained height that braiding mould rod makes progress from the bottom hole of some, and insert the bar of hanging silk use in the hole, tinsel 101 is turned back to hang over becomes bifilar silk on bar.To overwork again the tinsel in a week and weave, and can adopt a rhizoid to press the mode of a rhizoid during braiding, after being woven into certain length, support will be fixed on this braiding mould rod, thereby and heat-treat the braided support of producing single order.
Embodiment 2:
As shown in Figure 2, at the termination of support braiding end 110, can adopt back the processing of closing up of the mode of volume, thereby can avoid described support injured blood vessel.
Embodiment 3:
As shown in Figure 3, can bore at the differing heights that braiding mould rod makes progress from the bottom hole of some, there is plural at least hole at the sustained height place, and the axis projection of described central point of hole evenly distributes or is symmetrical arranged along braiding mould rod periphery or edge line.Insert the bar of hanging silk use in the hole, tinsel is turned back to hang over becomes bifilar silk on the different bar of height.Tinsel 201 shown in figure is one of tinsel that is hung on the highest extension screw mandrel in position on the mould rod.The tinsel that overworks a week is woven, can adopt a rhizoid to press the mode of a rhizoid during braiding, after being woven into certain-length, support is fixed on braiding mould rod, heat-treat.What make like this is multistage braided support, and the syndeton that is positioned at its initial braiding end 210 comprises plural the first rank protuberance 201a at least; Described the first rank protuberance 201a can be evenly distributed on the periphery of the initial braiding end 210 of support.The second-order protuberance is also near the initial braiding end 210 of support, and is still, more farther than the first rank initial braiding end margin of protuberance distance.Each protuberance comprises a mesh, is used for connecting described bracket conveyer.The summit of described protuberance can be adhered to cross sections different on described support separately; Each protuberance is made of individual thread.Such syndeton, the contained tinsel of its outer rim is less than the tinsel that the support remainder comprises, and more easily is compressed in the sheath pipe, and the braided support recyclability that adopts thus multistage weaving manner to make is better, and the resistance during recovery is less.
Embodiment 4:
As shown in Figure 4, tinsel pitch of the laps on the bar of extension silk use higher on braiding mould rod when hanging silk, every rhizoid can be divided into two.All the other tinsels are hung on the bar of extension silk use of the different braiding mould rod of height and be bent into bifilar silk.Tinsel 201 shown in figure is one of tinsel that is hung on the highest extension screw mandrel in position on the mould rod, hangs pitch of the laps on screw mandrel, forms the latch closure 201b of the first rank protuberance.Weave after overworking the tinsel in a week, can adopt a rhizoid to press the mode of a rhizoid during braiding, after being woven into certain-length, support is fixed on braiding mould rod, heat-treat.In the syndeton of its initial braiding end 210, the latch closure 201b of the first rank protuberance is used for being connected with described bracket conveyer, and what make like this is the multistage braided support that initial braiding end 210 has latch closure.In addition, use the same method, also can on the second-order protuberance of the initial braiding end of described multistage braided support, latch closure be set.The connection of the adaptive described bracket conveyer of described latch closure can reduce tinsel at the deflection of bending part, promotes anti-fatigue performance.
Embodiment 5:
As shown in Figure 5, namely stop braiding end 320 at the support tail end, the mode of available welding welds together adjacent two one metal wires, makes support tinsel in compression and release can not scatter and stabs blood vessel.Two adjacent rhizoids can also be intertwined becomes pigtail shape knot 321, makes its more difficult scattering.Can sheathed heat-shrinkable T bush outside described pigtail shape knot 321, avoid the effect of filoselle with further reinforcement.
When hanging silk, from weaving the tinsel that on the mould rod, higher extension screw mandrel sends, can meet in pairs on lower extension screw mandrel, form a latch closure with another one metal wire pitch of the laps on lower extension screw mandrel, and the aforementioned a pair of silk braid that crosses is advanced in latch closure.On a second-order protuberance as shown in the figure, a latch closure 202c is arranged, the first rank silk 201 passes from latch closure.Then all tinsels have been woven together, support has been fixed on braiding mould rod, heat-treated.What make like this is also the multistage braided support that latch closure is arranged, and the first rank grid of its syndeton is more sparse, more easily takes in the sheath pipe.And the tinsel on the first rank passes second-order latch closure wiry, and described latch closure makes the tinsel on the first rank be not easy to scatter, and has increased support force and the stability of support.
Embodiment 6:
As shown in Figure 6, the way of recycling of described support 400 comprises that employing one sub-thread reclaims silk 420 operations of carrying out, described sub-thread is reclaimed silk 420 pass in hollow push rod 410, after passing the mesh on the syndeton of described support 400, return in described push rod 410 and pull out.The recovery structure of carrier comprises sheath pipe (not shown), push rod 410 and reclaims silk 420, and push rod 410 can be the hollow tubule of spring Coil-up.For example, a rope can be passed a plurality of mesh on the syndeton of described support, then the formation rope sling be closed up at the two ends of rope.Again this rope sling is passed the push rod of bracket conveyer to the other end of bracket conveyer.On push rod, rope ends all is exposed at outside sheath pipe and push rod with the sheath pipe box.Firmly hold rope, the syndeton of support is drawn in, then draw in the sheath pipe of bracket conveyer, until whole support all is included into the sheath pipe.During propelling movement, use push rod outwards to push support, support is released the sheath pipe be released in blood vessel, temporarily rope sling can be stayed on support.During recovery, haul rope sling from the other end of bracket conveyer, firmly support is drawn and draws in the sheath pipe.As the need resetting, only need mobile sheath pipe, then stent pushing is gone out the sheath pipe.Until confirm that support is placed on the appropriate location, its form is also suitable, and rope sling is extracted out from the syndeton of support the most at last, and rope sling is together withdrawn with the sheath pipe.Described push rod 410 can be also solid hopkinson bar, at this moment reclaims silk 420 and is pasting push rod 410 and directly passing the sheath pipe, and other operating process is constant.
Embodiment 7:
As shown in Figure 7, the way of recycling of described support 400 comprises the operation that the recovery silk 520 that adopts an end that one draw ring 520a is set carries out, described recovery silk 520 ends with draw ring 520a are passed in hollow push rod 410, after passing again the mesh 401 on the syndeton of described support 400, pass described draw ring 520a with a fixing silk 521.For example, can set up the recovery silk with certain rigidity, the one end is coiled into a circle, i.e. described draw ring.The end that circle is arranged that reclaims silk is passed all mesh on the syndeton of support, then pass with a fixing silk with certain rigidity the circle that reclaims silk, and be placed in support, reclaim a silk maintenance tensioned state.This two rhizoid is passed the push rod of bracket conveyer to the other end of bracket conveyer, form recovery structure, then the syndeton of described support is drawn in draw in sheath pipe (not shown).During propelling movement, use push rod outwards to push support, support is released the sheath pipe be released in blood vessel, temporarily do not free fixing silk.During recovery, tighten and reclaim silk and fixing silk, haul whole recovery structure, firmly support is drawn and draws in the sheath pipe.Releasing bracket, carry out resetting again, until the position of support and form are all suitable, then will fix silk and extract out from the circle that reclaims silk, will fix at last silk and reclaim silk withdrawing from the sheath pipe.Described push rod 410 can be also solid hopkinson bar, at this moment reclaims silk 520 and is pasting push rod 410 and directly passing the sheath pipe, and other operating process is constant.
Embodiment 8:
As shown in Figure 8, the way of recycling of described support 400 comprises 620 operations of carrying out of the bifilar recovery silk of employing one, described bifilar recovery silk 620 is passed in hollow push rod 410, after passing the mesh 401 on the syndeton of described support 400, pass described bifilar recoverys threads 620 with a fixing silk 621.For example, a rhizoid is turned back form bifilar recoverys silk, then turning back of will reclaiming thread held all mesh on the syndeton of passing support.Pass the recovery silk with a fixing silk with certain rigidity, and be placed in support.This two rhizoid is passed the push rod 410 of bracket conveyer to the other end of bracket conveyer, form recovery structure, then the syndeton of described support is drawn in draw in sheath pipe (not shown); During propelling movement, use push rod outwards to push support, support is released the sheath pipe be released in blood vessel; During recovery, silk and fixing silk are reclaimed in tension, firmly support are drawn and draws in the sheath pipe.After treating that support location suitably, then releasing bracket fully, withdraw fixing silk, will reclaim at last thread to withdraw and free.Described push rod 410 can be also solid hopkinson bar, at this moment reclaims silk 620 and is pasting push rod 410 and directly passing the sheath pipe, and other operating process is constant.
Embodiment 9:
As shown in Figure 9, the way of recycling of described support 400 comprises the operation of adopting a plurality of recovery silks 720 that hook 720a at one end is set to carry out, band hook 720a one end that reclaims silk 720 is passed in hollow push rod 410, be hooked on one to one on the mesh 401 in the syndeton of described support 400.For example, there is the recovery silk of a plurality of hooks to hook the mesh of support with front end.During propelling movement, use push rod outwards to push support, support is released the sheath pipe be released in blood vessel, the syndeton of support does not temporarily break away from described hook.During recovery, pull whole recovery structure, firmly support is drawn and draws in sheath pipe (not shown).During releasing bracket, push away some push rods forward, shake a little described hook, utilize the resilience force of support, the syndeton of described hook and support is freed.Described push rod 410 can be also solid hopkinson bar, at this moment reclaims silk 720 and is pasting push rod 410 and directly passing the sheath pipe, and other operating process is constant.
Embodiment 10:
As shown in Figure 10, the way of recycling of described support 400 comprises that employing one with the operation that the push rod 410 of bayonet unit 410a carries out, is nested in a plurality of mesh 401 in described support 400 syndetons on the bayonet unit 410a of described push rod 410.For example, as shown in Figure 10, with one on its surface the push rod 410 with pin 410a, pin 410a is passed the mesh 401 of described support 400 syndetons, the syndeton of support 400 is fixed on this push rod 410.Then, push rod 410 is passed sheath pipe 820, the syndeton of described support 400 is drawn in draw in sheath pipe 820, on push rod 410, the top of pin 410a contacts with sheath pipe 820 inwalls, because of stopping of sheath pipe 820 inwalls, the syndeton of support 400 can not get loose from pin 410a.During propelling movement, use push rod 410 outwards to push support 400, support 400 is released sheath pipe 820 be released in blood vessel, do not allow pin 410a break away from sheath pipe 820, the syndeton of support 400 does not temporarily break away from push rod 410.During recovery, use push rod 410 to pull whole recovery structure, firmly draw and draw in support 400 in sheath pipe 820.During releasing bracket 400, push rod 410 is released forward the outer certain distance of sheath pipe 820, allow pin 410a stretch out outside sheath pipe 820, shake a little push rod 410, utilize the resilience of support 400, syndeton and the push rod 410 of support 400 are freed.
Embodiment 11:
As shown in Figure 11, the way of recycling of described support 400 comprises the operation of adopting a closure circle 920 that passes described support 400 all mesh 400 of syndeton outer most edge to carry out, the recovery silk 921 that one end is arranged a hook 921a passes in hollow push rod 410, is hooked on described closed circle 920.For example, as shown in Figure 11, penetrate a flexible rings 920 in the mesh 401 of support 400 syndetons; Hook flexible rings 920 on support 400 with a tinsel 921 with hook 921a, tinsel 921 is passed described hollow push rod 410, again with the sheath pipe box on push rod 410, catch at last tinsel 921 and push rod 410 that support 400 is drawn in and draw in sheath pipe (not shown).During propelling movement, use push rod to 410 outer propelling movement supports 400, support 400 is released the sheath pipe be released in blood vessel, temporarily do not free hook 921a.During recovery, use hook 921a to hold flexible rings 920, utilize flexible rings 920 firmly to draw and draw in support 400 in the sheath pipe.During releasing bracket 400, will link up with 921a and flexible rings 920 is freed.Described push rod 410 can be also solid hopkinson bar, at this moment reclaims silk 921 and is pasting push rod 410 and directly passing the sheath pipe, and other operating process is constant.
Embodiment 12:
First internal layer PTFE film is wrapped in outside overlay film internal layer mould, then with the support fixed cover of braiding in PTFE film outside, after outer PTFE film is wrapped in the support outside, thereby support is embedded in the centre of inside and outside two-layer PTFE film.After putting the outer mould of overlay film, at high temperature carry out sintering, sintering temperature is the 400-420 degree, can produce like this braided support of overlay film, and the support of overlay film can have isolated blood flow, makes blood only flow through in the tube chamber of support centre.
This shows, be compressible to the interior support of sheath pipe of described carrier, be positioned Endovascular by carrier, the support of releasing from described sheath pipe can restore to the original state and can be recycled in the sheath pipe.This support has columnar braiding skeleton, skeleton has initial braiding end and stops the braiding end, at described initial braiding end, a syndeton that mesh is relatively sparse is set, between the recovery structure of this syndeton and described bracket conveyer, forms disengageable annexation.And the syndeton of described initial braiding end is provided with a plurality of protuberances that extend vertically, and is as a whole with the skeleton braiding, and each protuberance all is made of individual thread and a mesh is arranged, and supplies the adapter of described recovery structure to pass.It is axially symmetrical that described protuberance can become, thereby can make described support keep balance, is difficult for run-off the straight during recovery.And the length that each protuberance extends vertically can be different, thereby avoid all protuberances drawn in simultaneously in described sheath pipe or be compressed on same position in described sheath pipe, the resistance when reducing to pull back.In the process that discharges described support, as long as described syndeton is not freed fully, the described syndeton of just can pulling back is retracted in described sheath pipe, then continues to pull back and can with in the described sheath pipe of whole described support retraction, realize reorientating, reclaim and/or again discharging of described support.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improve and conversion all should belong to the protection domain of claims of the present invention.
Claims (6)
1. a callable intravascular stent, comprise a pipe type netted skeleton that is woven into silk, and the one end arranges a syndeton, is used for forming disengageable the connection with a bracket conveyer; Described support can be packed in described carrier, and described support can restore to the original state after discharging from described bracket conveyer; Described syndeton comprises plural protuberance, and described protuberance is evenly distributed on the periphery of described support one end; It is characterized in that: each protuberance comprises a mesh, is used for the connection bracket carrier; Each protuberance is made of individual thread; The average-size of the mesh of described protuberance, average-size greater than other position mesh on described skeleton, can with an end of the described bracket conveyer of described support income, be used in the lumen of vessels resetting and/or reclaim described support by drawing described syndeton in.
2. callable intravascular stent according to claim 1, is characterized in that: be provided with the latch closure that adaptive described bracket conveyer connects on described protuberance.
3. callable intravascular stent according to claim 1, it is characterized in that: cross sections different on described support is adhered on the summit of described protuberance separately, consists of multistage braided support.
4. callable intravascular stent according to claim 3, it is characterized in that: be provided with latch closure on the second-order protuberance of described multistage braided support, the first rank silk of described multistage braided support passes described latch closure.
5. callable intravascular stent according to claim 1 is characterized in that: at the other end of described support, adjacent two rhizoids mutually are wound around and are a pigtail shape knot.
6. callable intravascular stent according to claim 1, is characterized in that: on the surface of described support, the choked flow film is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102656106A CN101933855B (en) | 2010-08-26 | 2010-08-26 | Recyclable vascular stent and recycling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102656106A CN101933855B (en) | 2010-08-26 | 2010-08-26 | Recyclable vascular stent and recycling method thereof |
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| Publication Number | Publication Date |
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| CN101933855A CN101933855A (en) | 2011-01-05 |
| CN101933855B true CN101933855B (en) | 2013-06-12 |
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| CN2010102656106A Active CN101933855B (en) | 2010-08-26 | 2010-08-26 | Recyclable vascular stent and recycling method thereof |
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