CN1238994A - Radially expansible support bending easily - Google Patents
Radially expansible support bending easily Download PDFInfo
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- CN1238994A CN1238994A CN 99107710 CN99107710A CN1238994A CN 1238994 A CN1238994 A CN 1238994A CN 99107710 CN99107710 CN 99107710 CN 99107710 A CN99107710 A CN 99107710A CN 1238994 A CN1238994 A CN 1238994A
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Abstract
A supporter expansible radially and being bending easily is used to transplant it in canals of human body. It has more rings, each including two Y-shaped elements and two W-shaped elements, which are alternatively arranged. For adjacent rings, the Y-shaped element of the first ring is opposite to the W-shaped one of the second ring, and the W-shaped element of the first element is opposite to the Y-shaped one of the second ring. The wire of the Y-shaped element in the first ring, which is parallel to axis of supporter is extended to the central top of W-shaped element in the second ring to form connection between adjacent rings. Said supporter is especially suitable for expanding the canals with smaller curvature radius.
Description
The present invention relates to be applicable to the radially distensible endovascular stent of the obstructive illness treatment of angiostenosis, more specifically, but relate to the endovascular stent of flexible radial dilatation.
Percutaneous has been widely used in through the angioplasty (PTA) of tube chamber and has treated the obstructive illness of angiostenosis clinically.State when operation on the implementation, must make the support in the implantable intravascular at least should be distensible diametrically,, thereby make the blood flow can be than freely pass through suitablely so that the caliber of the narrow section of blocking of blood vessel is expanded.This existing many people of endovascular stent with radial dilatation ability have proposed various solution.For example disclosed International Patent Application WO 92/09246 disclosed and has a kind ofly replaced the radially distensible endovascular stent that spiral type that the circle of reverse ellipse garden shape forms constitutes by filament Tower Allen J. in 1992, this support is discharged it after in implantable intravascular by reeling condition, distend the blood vessels under the effect of elastic restoring force.The high Chinese patent CN 2195343Y that waits of disclosed Xu Wen on April 26 nineteen ninety-five then discloses a kind of netted garden cylindrical stent of buckleing a circle with diameter less than the stainless steel silk of 0.1mm by similar knitting wool weaving manner along length and garden Zhou Fangxiang one circle, since this support to angiectatic supporting-point far more than the disclosed support of WO92/09246, thereby blood vessel can uniformly expanded under the stress.On March 25th, 1997 laid-open U.S. Patents US-5,613,981, William J.Boyle etc. has proposed a kind of two-way two sinusoidal wave helical stent, it forms bending to first wrap that helical form extends forward and formed second wrap that extends forward with the sinusoidal wave form curl of a hollow by second filament with sinusoidal wave form of a hollow by first filament, but the hand of spiral of second wrap is opposite with first wrap, and its internal diameter is bigger than first wrap, then with both near-end and the far-end formation that links together respectively.Above three kinds of supports can both realize upwards blood vessel dilating of footpath.
Except that above-mentioned, also proposed to improve new departure of support local segment intensity.For example, in February, 1997 disclosed European patent application EP-0758541A
1, Miksza and Amthony S. have proposed a kind of support that can improve radial strength.On August 1st, 1997 disclosed european patent application Ep-0800801A
1, Limon Timothy A. and Turnlund Todd H. have proposed a kind of length direction along support and have had the support that changes structural strength.In addition, Chen Jie has proposed the support that a kind of energy compensates its longitudinal length shortening that causes owing to the support radial dilatation in Chinese patent application CN98203487.3, has solved the difficult problem owing to longitudinal length shortening after the support radial dilatation of puzzlement always.
As everyone knows, the intravital blood vessel of people or other tube chamber are not straight or with less curvature bending, but natural torsion, sometimes curvature can be very big, in case stricture obstruction occurs at this position, adopt the support that has plural connecting device between the above-mentioned adjacent turn, for example, EP-0800801A
1Disclosed support, it has four connecting devices between adjacent turn, it just makes and forms a rigid structure between the adjacent turn, when this support is implanted in the bigger vessel segment of curvature, form polyline shaped with regard to being difficult to comply with the natural torsion of blood vessel, furtherly, owing to implanted above-mentioned support they are stretched near a side of the center of curvature with away from a side of the center of curvature at the bigger vessel segment of curvature, and will be much larger than a side away from the center of curvature near the stretching that the center of curvature one side is subjected to, thereby make the tube wall attenuation of blood vessel, the appearance of vascular wall attenuation, elderly patients particularly, this will cause angiorrhexis hemorrhage, and its consequence obviously is extremely serious.
Therefore, the object of the present invention is to provide a kind of above-mentioned defective that can overcome, radially expansible support bending easily.
But the support according to flexible radial dilatation of the present invention comprises a plurality of circles, use the term circle at this, meaning with the support longitudinal axis is axis, by the specific garden cylindricality circle that geometric figure constituted, its wall thickness is much smaller than its diameter, each circle comprises two W shape elements and two Y shape elements, W shape element and the alternate configuration of Y shape element, and make the Y shape element of first adjacent circle relative with the W shape element of second circle, simultaneously, make the W shape element of first circle relative with the Y shape element of second circle, wherein, the line that the Y shape element of first circle parallels with the support axis extend to second circle W shape element in the middle of partly summit, thereby the Y shape element that constitutes first circle is connected the connecting device of second circle with the line that the support axis parallels, therefore, between adjacent turn, have only two connecting devices.
Therefore, according to radially expansible support bending easily of the present invention behind implantable intravascular, it carries the vessel segment that installs to the desire treatment as the described support of prior art by support, from conveyer device, discharge support then, withdraw from stent conveying device, support is in radial dilatation, thereby this blood vessel is expanded, reach the stricture obstruction of eliminating or reducing existence in this vessel segment, make restoration of blood flow unimpeded.Crooked when running into, very during the less vessel segment of the radius of curvature of hyperamization canal curvature, have only two connecting devices according to radially expansible support bending easily of the present invention owing between adjacent two circles, therefore, it can wind by two plane that connecting device determined deflections relatively adjacent corral along the curvature of the axial compliance blood vessel of blood vessel, be implemented under the situation that does not make the blood vessel wall varied in thickness or only make under the vicissitudinous slightly situation of blood vessel wall, and this variation is in the scope of the strain of blood vessel wall and assurance blood vessel wall intensity the less blood vessel of radius of curvature to be expanded, reach this vessel segment elimination or reduce its stricture obstruction, so that blood flow is unimpeded.
Obviously, solved the expansion of the very little vessel segment of radius according to radially expansible support bending easily of the present invention.
Secondly, simple in structure according to radially expansible support bending easily of the present invention, be easy to make, cost is low, and the more complicated part of implantation of any support than prior art can not arranged the patient when clinical use, is easy to promote.
Above-mentioned purpose of the present invention and other purpose and advantage thereof will be more readily apparent from by the detailed description below in conjunction with the accompanying drawing illustrated embodiment, and accompanying drawing has:
Fig. 1 is the perspective view according to first embodiment of radially expansible support bending easily of the present invention;
Fig. 2 is the expanded view of support shown in Figure 1;
Fig. 3 is the sectional view in the III-III cross section of Fig. 2;
Fig. 4 is that support shown in Figure 1 is implanted in endovascular sketch map;
Fig. 5 is the perspective view according to second embodiment of radially expansible support bending easily of the present invention;
Fig. 6 is the expanded view of support shown in Figure 4;
Fig. 7 is the schematic representation of apparatus that is used to process support of the present invention;
Fig. 8 is the flow process chart of processing radially expansible support bending easily of the present invention.
At first, see figures.1.and.2 explanation according to first embodiment of radially expansible support bending easily of the present invention.As shown in the figure, support 1 has the profile of a figure cylindricality, it is made up of a plurality of circles 10,20,30,40, each circle comprises that the element 11,13 of two Y shapes becomes W shape element 12,14 to form with two, but Y shape element and the apart configuration of W shape element, and Y shape element is connected with the adjacent edge of W shape element.Between adjacent turn, for example enclose between 10 and 20, corresponding with the Y shape element 11,13 of circle on 10 is W shape element 22 and 24 on the circle 20, corresponding with the W shape element 12,14 on the circle 10 is Y shape element 21 and 23 on the circle 20.Wherein, the limit 15,17 that parallels with the support longitudinal axis of Y shape element extends on W shape element 22, the 24 intermediary summits 26,28 of next circle (for example enclosing 20) along the longitudinal axis, thus, in fact the limit 15,17 of Y shape element 11,13 has constituted encloses 10 connecting devices that are connected between 20 with circle.It should be noted that circle 10 and circle between 20 connecting device and enclose 20 and the connecting device that encloses between 30 be in each other on the mutually orthogonal direction, surplus person is identical with it, Pei Zhi benefit is that support both had been easy to bending in the implant into body blood vessel, make it to keep certain rigid again like this.
Fig. 3 shows the shape in cross section of the filament on the limit that constitutes support, and wide have two chamferings to reduce the friction to blood vessel wall on the square-section, prevent thromboembolism again.
Illustrate how to distend the blood vessels in the support illustrated in figures 1 and 21 implant into body blood vessel below in conjunction with Fig. 4.Support 1 is sent into the vessel segment of desire expansion by the conveyer device (not shown), exist on the inwall of this vessel segment because stricture obstruction appears in formed this vessel segment that makes of deposition, zone shown in dashed lines among the figure, when conveyer device is implanted in support 1 in the described vessel segment, because support 1 is to be in compressive state when implanting, it will return to its original shape in case conveyer device withdraws from the back, at this moment constitute the Y shape of support 1 and the interior shade of limit compressing vessel segment of W shape element and partly force its inwall direction displacement along vessel segment, thus, make the vessel segment radial dilatation, thereby realize eliminating or the interior stricture obstruction of reduction vessel segment, make blood flow unimpeded.
Continue below to illustrate with reference to Fig. 4 how support 1 adapts to the natural curvature of vessel segment.For convenience of explanation, only show among the figure by four supports 1 that circle 10,20,30 and 40 is formed.Comprise six connecting devices 15,17,25,27 and 35,37 between the above-mentioned circle.Wherein connecting device 15,17 and 35,37 are in the direction consistent with the bending direction of vessel segment, and connecting device 25,27 with the orthogonal position of bending direction of vessel segment, the spacing that causes enclosing between 20 and 30 upper end increases, the spacing of lower end reduces, and does corresponding displacement because the variation of circle 20 and 30 upper and lower side spacings will drive circle 10 and 40, but because connecting device 15,17 and 35,37 are in vessel segment and move towards identical direction, thereby they are in " rigidity " state, finally are formed on circle 20, between 30 by protruding on the direction as shown, two ends ( circle 10 and 20 between and enclose between 30 and 40) are distinguished downward-sloping, thereby meet the curvature of this vessel segment.
With reference to second embodiment of Fig. 5 and Fig. 6 explanation according to radially expansible support bending easily of the present invention.In this embodiment, support 2 is made up of a plurality of circles, and each circle comprises two Y shape elements and two W shape elements, for example encloses 210, comprises Y shape element 211 and 213, two W shape elements 212 and 214.Each limit of different with embodiment illustrated in figures 1 and 2 is W shape element is not with the bearing of trend unanimity of support 2, but tilt with it, but the adjacent vertical spacing in W shape element top equates, and the width on W shape element top also is identical with previous embodiment.Two Y shape elements of each circle, for example, the Y shape element 211 of circle 210 and 213 limit 215,217 is still consistent with the bearing of trend of support 2, and terminate on the intermediary summit of W coil element of next circle, therefore, the effect of the connecting device that adjacent turn is connected is played on limit 215 and 217.
The process equipment and the manufacture method of radially expansible support bending easily of the present invention are described below with reference to Fig. 7 and Fig. 8.Radially expansible support bending easily of the present invention is to use the tubular material compatible with human-body biological to make, and particularly makes with the tubulose stainless steel material.Size based on support is less, and the structured element material on it makes, and therefore adopts by computer-controlled laser instrument and Digit Control Machine Tool processing.Idiographic flow is: to processing required device, comprise computer, energized such as laser instrument and Digit Control Machine Tool and finish preheating and self-check program after, be fixed in part blank on the Digit Control Machine Tool and whether detect its installation correct, in case the blank part correctly is installed on the Digit Control Machine Tool, computer is pressed predetermined support shape and size to Digit Control Machine Tool move instruction and data, Digit Control Machine Tool cuts into predetermined shape and size by laser instrument, whenever finishing the cutting of an element once checks, carry out the cutting of next element after qualified again, so come and go, until finishing whole processing.
The applicant is described in detail with regard to radially expansible support bending easily of the present invention and embodiment; but be not limited thereto; can make various conversion and improvement on this basis to the professional and technical personnel; but these conversion and improvement all do not break away from spirit of the present invention, all within the protection domain of appended claims.
Claims (4)
1, a kind of radially expansible support bending easily, it is characterized in that it comprises a plurality of circles, each circle comprises two Y shape elements and two W shape elements, Y shape element and the alternate configuration of W shape element, and between the adjacent turn, make the Y shape element of first circle relative with the W shape element of second circle, the W shape element of first circle is relative with the Y shape element of second circle, wherein, the line that the Y shape element of first circle parallels with the support axis extends to the summit of mid portion of the W shape element of second circle, thereby the Y shape element that constitutes first circle is connected the connecting device of second circle with the line that the support axis parallels, therefore, have only two connecting devices between the adjacent turn.
2,, it is characterized in that each limit and support shaft line parallel of described W shape element according to the described support of claim 1.
3,, it is characterized in that each limit of described W shape element and support axis tilt according to the described support of claim 1.
4, according to the described support of claim 1, the cross sectional shape that it is characterized in that the limit of described support is the rectangle in a side chamfering that contacts with blood vessel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99107710 CN1238994A (en) | 1999-05-25 | 1999-05-25 | Radially expansible support bending easily |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99107710 CN1238994A (en) | 1999-05-25 | 1999-05-25 | Radially expansible support bending easily |
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| Publication Number | Publication Date |
|---|---|
| CN1238994A true CN1238994A (en) | 1999-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 99107710 Pending CN1238994A (en) | 1999-05-25 | 1999-05-25 | Radially expansible support bending easily |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352406C (en) * | 2004-08-17 | 2007-12-05 | 微创医疗器械(上海)有限公司 | Combined membrane-covered stent capable of being bent in any direction |
| CN113116408A (en) * | 2019-12-31 | 2021-07-16 | 浙江乾合畅脉医疗科技有限公司 | High-support net pipe structure |
-
1999
- 1999-05-25 CN CN 99107710 patent/CN1238994A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352406C (en) * | 2004-08-17 | 2007-12-05 | 微创医疗器械(上海)有限公司 | Combined membrane-covered stent capable of being bent in any direction |
| CN113116408A (en) * | 2019-12-31 | 2021-07-16 | 浙江乾合畅脉医疗科技有限公司 | High-support net pipe structure |
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