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If a part of the metal stent has not grown into a vessel, can this part of the stent be washed out by the blood flow in 10 to 40 years (theoretically)?

Also are such cases known that blood flow destroy part of the metal stent in 10 to 20 years (practically)?

For example, titanium + nickel (self-expanding stent).

Clarification: Metal stents can corrode/dissolve, but this process is uneven, so some parts of the stents can dissolve earlier, and some later — then these parts break away from the stent and float to the heart and lung (if this part of the stent has not grown into a vessel)

Question: I clarified the question: what percentage of the different types of effects contribute to stent fragmentation: vessel pulsation, mechanical bending, blood flow? What percentage (1%, 10%, 90%) of stents breaks down into fragments from mechanical stress (arterial pulsation, ...), and what percentage (1%, 10%, 90%) of stents breaks down into fragments from blood flow (corrode/dissolve) after 10-40 years?


For example, stents broken into several parts:

Computed tomography (CT) image showing fracture of right coronary artery (RCA) stent into three fragments

enter image description here

  • I've never heard of a coronoary or other arterial stent being broken apart by blood flow, other than erosion of the drug-eluding stent coating perhaps. A stent is basically a mesh tube... Where is your source for this? – DoctorWhom Sep 23 '19 at 21:41
  • @DoctorWhom I just know that over time, stents break down, as do kava filters. If arterial stents are destroyed possibly due to cardiac pulsation. What could be causing the cava filter or Venous Stent to break, is it not a blood flow? – Alex Sep 24 '19 at 11:30
  • @Alex Stents can fail, but they don't literally break down. The usually fail either because they didn't deploy properly in the first place or they become obstructed by the body's healing response. Vena cava filters are similar. They can migrate (rarely), but the metal doesn't break down. – Carey Gregory Sep 24 '19 at 14:58
  • @Carey Gregory♦ Kava filters can be destructed and their parts enter the heart and lungs. One cava-filter was destructed after 4 days [101]. 101. Chitwood W.R., Chiang K.S., Williams J.M. et al. Embolectomy of a Bird’s Nest vena cava filter // The Annals of Thoracic Surgery. 1994. Vol. 58 (6). P. 1766–1768. doi.org/10.1016/0003–4975 (94) 91687-x. – Alex Sep 24 '19 at 15:13
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    I clarified the question: what percentage of the different types of effects contribute to stent fragmentation: vessel pulsation, mechanical bending, blood flow ? – Alex Sep 24 '19 at 20:18

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