CN101584617A - Furcated intravascular stent - Google Patents

Abstract

The invention discloses a furcated intravascular stent which comprises a main body stent section provided with tectorial membrane and a branch stent section connected with the main body stent section, and the connection position of the main body stent section and the branch stent section is provided with a leading-in section with a horn shape. The upper part of the leading-in section is narrow and the lower part is wide, and the design enlarges the diameter of the leading-in section, can obviously improve the leading-in performance of the branch stent and makes the leading-in process be simple and smooth. In addition, one end of the branch stent is designed as a crown shape, a short branch section of the main body stent section has a taper so as to be beneficial for enhancing the adherent performance of the proximal end of the branch stent, the pull-out force between the branch stent and the short branch section is improved, and the use risk of the stent is reduced.

Description

A kind of branch type intravascular stent

Technical field

The present invention relates to a kind of Wicresoft and hinder the interventional medical device product, be specifically related to a kind of branch type intravascular stent.

Background technology

Along with the development of modern medicine, artificial blood vessel bracket is as a kind of novel intervention vascular treatment technology, is applied to just constantly that large artery trunks is narrow, treatment of diseases such as valve abnormalities, dissection of aorta and aneurysm.Wherein, much more very the intravascular stent (abbreviation overlay film frame) that has overlay film is seen in aneurysmal treatment.

In recent years, intervention property vascular treatment technology has been applied to the treatment of dissection of aorta, and obtained gratifying achievement, at first adopted overlay film frame closed treating Type B dissection of aorta to separate abroad in 1994, postoperative finds that thromboembolism all appears in the false chamber of nearly all patient and obturation has realized treatment truly, compare with surgical operation, relevant complication does not almost appear in the patient of interventional therapy, and surgical operation group patient's acute events incidence rate is 42%, and mortality rate is 25%.

Aneurysm is very dangerous clinically a kind of angiopathy, once finding the aneurysm patient, should carry out corresponding treatment to it as early as possible.At present, utilizing the Wicresoft of inner cavity insulation principle to hinder interventional therapeutic technique is widely used, it is with the thinner induction system of a cover caliber, the overlay film frame that the band of confined state supports is sent to the vascular lesion position, after accurately locating, with its release and covering lesion vessels, isolated vascular lesion position also forms new channel of blood flow.When overlay film frame is used for aneurysm treatment, it is sent into the position at aneurysm place by corresponding induction system and discharges, the two end supports that makes overlay film frame is on the normal blood vessels at aneurysm two ends, make aneurysm and blood isolated, aneurysm is after the forfeiture blood supply, and tumor intracavity remained blood forms thrombosis gradually and flesh changes into vascular tissue, and the tumor wall of expansion state shrinks because of being subjected to negative pressure, return near original form gradually, thereby reach the aneurysmal purpose of treatment.

At present the endoluminal vascular prosthesis support has been accomplished to commercially produce, and mainly is divided into straight type and branch type, be by the outsourcing of Ultimum Ti endovascular stent or in cover the porous Teflon varicosity or dacron membrane is made.

The branch type intravascular stent comprises integral structure and split-type structural, and wherein split-type structural is made up of main body overlay film frame and branch's overlay film frame two parts, and branch's overlay film frame part is mated to discharge at release main body overlay film frame Duan Houzai and installs.For the artificial blood vessel bracket of integral type, generally can not cause risk, and for split type intravascular stent, owing in the process that support discharges, often discharge main body rack earlier, then import branch's mounting system again, if the difficulty of importing may cause bigger risks such as operative failure.

The end that the main body overlay film frame section of existing branch type intravascular stent matches with the branch overlay film frame does not often have introduction segment, the shortcoming that such design exists is: after the main body overlay film frame discharges in blood vessel, need a seal wire to enter the short branch support of main body overlay film frame section, branch's stent delivery system enters short branch along seal wire then, if there is not introduction segment, seal wire imports the comparison difficulty that will become, and can increase operating time, even cause operative failure.

Have again, the short branch support of the main body overlay film frame section of existing branch type intravascular stent does not normally have tapering, like this when main body overlay film frame and branch's overlay film frame cooperation, can not form one " wedge shape ", pulling-out force can be lower, branch's support even might cause serious consequence from main body rack like this because the pulling-out force that cooperates with main body rack is crossed low and broken away from.

Summary of the invention

Goal of the invention of the present invention provides a kind of branch type intravascular stent that has introduction segment, makes the importing of branch's support be more prone to, and more smooth and easy.

For the facility on describing, hereinafter the near-end of being mentioned refers to the end near heart, and far-end refers to the end away from heart.

The technical scheme that the present invention provides for achieving the above object is:

A kind of branch type intravascular stent comprises the main body rack section of being with overlay film and the branch's brace sections that links to each other with the main body rack section, and wherein said main body rack Duan Zaiqi and branch's brace sections connecting place are provided with the introduction segment of " horn mouth " shape.

Wherein, described main body rack section comprises long son field and short son field, is connected with the introduction segment of " horn mouth " shape at an end of described short son field.

Wherein, the slot of described " horn mouth " joins with short son field, and " horn mouth " shape introduction segment is connected with short son field by the mode of sewing up.

Wherein, described short son field has tapering wide at the top and narrow at the bottom, and promptly the narrow end of the bore of short son field connects " horn mouth " shape introduction segment.The scope of tapering β is: 0 degree-60 degree.

Described " horn mouth " shape is specially up-narrow and down-wide, and last lower section is circle or ellipse, and the scope of the angle α that introduction segment both sides prismatic becomes is 0 degree-90 degree.Introduction segment adopts the alloy silk to work out, and supports the introduction segment that overlay film forms " horn mouth " shape.The alloy silk that the support of introduction segment is preferably thinner, can adopt 0.010 "-0.020 " alloy silk braiding form, make it reduce maximum outline when support is compressed into limit state in induction system, thereby have compliance preferably, help installing and discharging.

As optimized technical scheme, the end that is connected with the main body rack section of described branch brace sections is " Phaleria macrocarpa shape " structure.

Wherein, described main body rack section comprises long son field and short son field, and described branch brace sections is connected with short son field, and promptly described branch brace sections is " Phaleria macrocarpa shape " structure with the end that short son field matches.Described " Phaleria macrocarpa shape " structure specifically refers to cut out the outer unnecessary overlay film of support, only keeps the overlay film that covers holder part.Wherein, the diameter of the head end of " Phaleria macrocarpa shape " structure is bigger slightly than short son field internal diameter.Wherein, the support of " Phaleria macrocarpa shape " shape can adopt 0.010 "-0.020 " alloy silk braiding form.

Branch type intravascular stent of the present invention is compared with prior art, owing to be connected with the introduction segment of " horn mouth " shape at short branch one end of main body rack section, introduction segment is up-narrow and down-wide, this design can significantly improve the importing performance of branch's support by the diameter that enlarges introduction segment, makes its importing process become simple and smooth and easy.

Branch's brace sections one end in the optimal technical scheme of the present invention is designed to " Phaleria macrocarpa shape ", its advantage has two: one, branch's mount proximal end is designed to " Phaleria macrocarpa shape ", cuts out and removes unnecessary overlay film, helps improving the adherent performance of branch's brace sections near-end, if there is not the design of " Phaleria macrocarpa shape ", behind branch's brace sections implantable intravascular, fold appears in overlay film that mount proximal end is positioned at the tinsel outside easily, and blood flow enters from fold easily, thereby cause the near-end internal hemorrhage due to trauma, influence therapeutic effect; Its two, the design of " Phaleria macrocarpa shape " mount proximal end has certain tapering, can be tightr when branch's brace sections matches with short son field, can improve pulling-out force between the two, reduce the application risk of support.

The short son field of the main body rack section in the further optimized technical scheme of the present invention has tapering, form one " wedge shape " in the time of can making it and the branch support cooperates, bonding strength in the time of can effectively promoting the main body rack section and the branch brace sections matches reduces the support application risk.

Description of drawings

Fig. 1 is the structural representation of branch type intravascular stent of the present invention.

Fig. 2 is " horn mouth " shape introduction segment sketch map of branch type intravascular stent of the present invention.

Fig. 3 is " Phaleria macrocarpa shape " structural representation of branch's mount proximal end of branch type intravascular stent of the present invention.

Blood flow performance sketch map in blood vessel when Fig. 4 does not have " Phaleria macrocarpa shape " structure for common intravascular stent.

Fig. 5 is the short son field structural representation that has tapering of branch type intravascular stent of the present invention.

Caption: 1, main body rack section; 2, branch's brace sections; 11, lack son field; 12, " horn mouth " shape introduction segment; 22, " Phaleria macrocarpa shape " structure of branch's brace sections.

The specific embodiment

The end that the main body rack section of existing branch type intravascular stent matches with the branch brace sections does not often have introduction segment, its shortcoming is that the main body rack section discharges in blood vessel after, need a seal wire to enter the short son field of main body rack section, branch's stent delivery system enters short son field along seal wire then, if there is not introduction segment, seal wire imports the comparison difficulty that will become, and can increase operating time, even cause operative failure.The present invention is more prone to smooth and easy for the importing that makes branch's support, the introduction segment that in the short branch of main body rack section, has " horn mouth " shape, introduction segment is up-narrow and down-wide, this design can significantly improve the importing performance of branch's support by the diameter that enlarges introduction segment, makes its importing process become simple and smooth and easy.

Further specify the present invention below in conjunction with accompanying drawing.

Fig. 1 is the structural representation of branch type intravascular stent of the present invention, comprise main body rack section 1 and the branch's brace sections 2 of being with overlay film, main body rack section 1 comprises long son field and short son field 11, wherein has the introduction segment 12 of " horn mouth " shape at an end of described short son field 11.The slot of described " horn mouth " joins with short son field, and " horn mouth " shape introduction segment 12 is connected with short son field 11 by the mode of sewing up.

Fig. 2 is " horn mouth " shape introduction segment sketch map of branch type intravascular stent of the present invention, and it is up-narrow and down-wide that wherein said " horn mouth " shape is specially, and last lower section is circle or ellipse, and the scope of the angle α that introduction segment both sides prismatic becomes is 0 degree-90 degree.Introduction segment adopts the alloy silk to work out, and supports the introduction segment 12 that overlay film forms " horn mouth " shape.The alloy silk that the alloy silk of introduction segment is preferably thinner, can adopt 0.010 "-0.020 " alloy silk braiding form, make it reduce maximum outline (profile) when support is compressed into limit state in induction system, thereby have compliance preferably, help installing and discharging.

Fig. 3 is " Phaleria macrocarpa shape " structural representation of branch's mount proximal end of branch type intravascular stent of the present invention, blood flow performance sketch map in blood vessel when Fig. 4 does not have " Phaleria macrocarpa shape " structure for common intravascular stent.The diameter of the head end of " Phaleria macrocarpa shape " structure is bigger slightly than short son field 11 footpaths, branch's brace sections 2 enters the short son field 11 of main body rack section by induction system, branch's brace sections 2 also is compressed in the induction system at this moment, by the time after entering suitable position, branch's brace sections 2 will discharge from branch's stent delivery system, and branch's brace sections 2 will return to normal user mode at this moment.

The near-end of branch's brace sections 2 is designed to " Phaleria macrocarpa shape ", makes it have certain tapering, can be tightr when branch's brace sections 2 matches with short son field 11 like this, can improve pulling-out force between the two, and reduce the application risk of support.The near-end of branch's brace sections 2 is cut out and is removed unnecessary overlay film, only keep the overlay film that covers holder part, help improving the adherent performance of branch's brace sections 2 near-ends like this, if there is not the design of " Phaleria macrocarpa shape ", behind branch's brace sections 2 implantable intravasculars, fold appears in overlay film that mount proximal end is positioned at the tinsel outside easily.As shown in Figure 4, blood flow did not enter from fold easily when common intravascular stent had " Phaleria macrocarpa shape " structure, thereby caused the near-end internal hemorrhage due to trauma, influenced therapeutic effect.The holder part of " Phaleria macrocarpa shape " can adopt 0.010 "-0.020 " alloy silk braiding form, make it have compliance preferably, help installing and discharging.

Fig. 5 is the short son field structural representation that has tapering of branch type intravascular stent of the present invention, and short son field 11 has tapering wide at the top and narrow at the bottom, and promptly the narrow end of the bore of short son field 11 connects " horn mouth " shape introduction segment 12.The scope of tapering β is: 0 degree-60 degree.

Two parts of branch type intravascular stent of the present invention are that main body rack section 1 and branch's brace sections 2 are successively sent into diseased region and release by corresponding carrier from bilateral femoral arterial respectively.After two parts brace sections discharges respectively, connect as a wholely in vivo, overlay film frame self forms new channel of blood flow, the aneurysm of diseased region is got rid of outside blood circulation, thereby realized isolated to the tumor chamber, reaches the aneurysmal purpose of treatment.

It is to be noted; the described branch type intravascular stent of specific embodiment part be for better implement the present invention preferred embodiment; protection scope of the present invention is not limited to the described technical scheme of above-mentioned embodiment; and should be as the criterion with the described flesh and blood of claims, any possible structural change is only otherwise the scope that the flesh and blood that breaks away from claim of the present invention all belongs to the present invention to be protected.

Claims (14)

1, a kind of branch type intravascular stent, comprise it is characterized in that the main body rack section of being with overlay film and the branch's brace sections that links to each other with the main body rack section: described main body rack Duan Zaiqi and branch's brace sections connecting place are provided with the introduction segment of " horn mouth " shape.

2, branch type intravascular stent according to claim 1 is characterized in that: described main body rack section comprises long son field and short son field, is connected with the introduction segment of " horn mouth " shape at an end of described short son field.

3, branch type intravascular stent according to claim 2 is characterized in that the slot of described " horn mouth " and short son field join.

4, branch type intravascular stent according to claim 2 is characterized in that " horn mouth " shape introduction segment is connected with short son field by the mode of sewing up.

5, branch type intravascular stent according to claim 2 is characterized in that described short son field has tapering wide at the top and narrow at the bottom.

6, branch type intravascular stent according to claim 5 is characterized in that described range of taper is 0 degree-60 degree.

7, branch type intravascular stent according to claim 1 is characterized in that the last lower section of " horn mouth " shape introduction segment is circle or ellipse.

8, branch type intravascular stent according to claim 1 is characterized in that the angular range that introduction segment both sides prismatic becomes is 0 degree-90 degree.

9, branch type intravascular stent according to claim 1 is characterized in that the support of introduction segment adopts thinner alloy silk.

10, branch type intravascular stent according to claim 1 is characterized in that the end that is connected with the main body rack section of described branch brace sections is " Phaleria macrocarpa shape " structure.

11, branch type intravascular stent according to claim 10 is characterized in that described main body rack section comprises long son field and short son field, and described branch brace sections is connected with short son field.

12, branch type intravascular stent according to claim 11 is characterized in that the diameter of head end of " Phaleria macrocarpa shape " structure is bigger slightly than short son field internal diameter.

13, branch type intravascular stent according to claim 10 is characterized in that the holder part of " Phaleria macrocarpa shape " structure keeps overlay film.

14, branch type intravascular stent according to claim 10 is characterized in that the holder part of " Phaleria macrocarpa shape " structure adopts thinner alloy silk.

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