Stent Graft
A covered stent and bare stent technology, applied in stents, medical science, blood vessels, etc., can solve problems such as increasing the risk of stent displacement, insufficient adherence of bare stents, and thrombosis
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no. 1 example
[0027] Such as image 3 As shown, a stent graft 10 includes a stent graft segment 11 and a bare stent segment 12 connected to the proximal end of the stent graft segment 11 . The bare stent segment 12 includes a wave-shaped ring. It can be understood that the bare stent segment 12 may also include a plurality of wave-shaped rings. , wherein a waveform 121 bends away from the axis 13 of the stent-graft 10 .
[0028] Such as Figure 4 As shown, the Stanford type B dissection extended only to the descending aorta or extended to the abdominal aorta, but did not involve the ascending aorta and aortic arch. The intimal tear of Stanford type B dissection is often located in the isthmus of the aorta, close to the root of the left subclavian artery. The existence of the bare stent segment 12 can make the proximal end of the covered stent segment 11 close to the lower edge of the opening of the branch blood vessel 16. The dissection breach 17 is well blocked without hindering the blo...
no. 2 example
[0032] Such as Figure 5 As shown, the structure of the stent-graft 20 of this embodiment is basically the same as that of the first embodiment, the difference is that in this embodiment, the bare stent segment 22 of the stent-graft 20 also has an axial 23 is a curved waveform 222 , and the waveform 222 is opposite to the waveform 221 that is curved away from the axis 23 of the stent-graft 20 .
[0033] Similarly, in the case where the two waveforms 221 and 222 exist in the bare stent segment 22, the large and small curvature of the stent-graft 20 has been determined, and has directionality during implantation, such as Figure 6 As shown, the waveform 221 should be aligned with the lesser curvature 24 of the aortic arch, and the waveform 222 should be aligned with the greater curvature 25 of the aortic arch.
[0034] The curvature of the waveform 222 enables the bare stent segment 20 to fit the curvature of the greater curvature side 25 of the aortic arch well. Therefore, th...
no. 3 example
[0037] Such as Figure 7 and Figure 8 As shown, the structure of the stent-graft 30 of this embodiment is basically the same as that of the previous embodiment. The difference is that in this embodiment, the peaks and vertices of multiple waveforms of the bare stent segment 32 fall on the same circumference. , the circle has a radius R1, and the peaks of the troughs of a plurality of waveforms fall on another same circle, which has a radius R2. Moreover, R1>R2, so that the bare stent segment 32 is in the shape of a “trumpet” radiating away from the axis 33 of the stent graft 30 . That is to say, in this embodiment, the bare stent segment 32 has a certain taper.
[0038] The bare stent segment 32 has a certain taper so that the covered stent 30 can exert good adhesion and anchoring performance when dealing with lesions with severe curvature of the aortic arch or large changes in vessel diameter. At the same time, the curved waveforms of the waveform 321 on the lesser curvatur...
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