Testing bioresorbable stent feasibility in a rat aneurysm model.

Grüter, Basil Erwin; Täschler, Dominik; Strange, Fabio; Rey, Jeannine; von Gunten, Michael; Grandgirard, Denis; Leib, Stephen; Remonda, Luca; Widmer, Hans Rudolf; Nevzati, Edin; Fandino, Javier; Marbacher, Serge; Coluccia, Daniel (2019). Testing bioresorbable stent feasibility in a rat aneurysm model. Journal of neurointerventional surgery, 11(10), pp. 1050-1054. BMJ Publishing Group 10.1136/neurintsurg-2018-014697

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BACKGROUND

Advances in stent-assisted coiling have incrementally expanded endovascular treatment options for complex cerebral aneurysms. After successful coil consolidation and aneurysm occlusion, endovascular scaffolds are no longer needed. Thus, bioresorbable stents that disappear after aneurysm healing could avoid future risks of in-stent thrombosis and the need for lifelong antiplatelet therapy.

OBJECTIVE

To assess the applicability and compatibility of a bioresorbable magnesium- alloy stent (brMAS) for assisted coiling.

METHODS

Saccular sidewall aneurysms were created in 84 male Wistar rats and treated with brMAS alone, brMAS + aspirin, or brMAS + coils + aspirin. Control groups included no treatment (natural course), solely aspirin treatment, or conventional cobalt-chromium stent + coils + aspirin treatment. After 1 and 4 weeks, aneurysm specimens were harvested and macroscopically, histologically, and molecularly examined for healing, parent artery perfusion status, and inflammatory reactions. Stent degradation was monitored for up to 6 months with micro-computed and optical coherence tomography.

RESULTS

Aneurysms treated with brMAS showed advanced healing, neointima formation, and subsequent stent degradation. Additional administration of aspirin sustained aneurysm healing while reducing stent-induced intraluminal and periadventitial inflammatory responses. No negative interaction was detected between platinum coils and brMAS. Progressive brMAS degradation was confirmed.

CONCLUSIONS

brMAS induced appropriate healing in this sidewall aneurysm model. The concept of using bioresorbable materials to promote complete aneurysm healing and subsequent stent degradation seems promising. These results should encourage further device refinements and clinical evaluation of this treatment strategy for cerebrovascular aneurysms.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute for Infectious Diseases > Research
04 Faculty of Medicine > Service Sector > Institute for Infectious Diseases
04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurosurgery
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Forschungsbereich Mu50 > Forschungsgruppe Neurochirurgie

UniBE Contributor:

Grandgirard, Denis; Leib, Stephen and Widmer, Hans Rudolf

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

1759-8486

Publisher:

BMJ Publishing Group

Language:

English

Submitter:

Stephen Leib

Date Deposited:

06 May 2019 17:13

Last Modified:

17 Sep 2020 03:51

Publisher DOI:

10.1136/neurintsurg-2018-014697

PubMed ID:

30852526

Uncontrolled Keywords:

aneurysm coil stent

BORIS DOI:

10.7892/boris.127811

URI:

https://boris.unibe.ch/id/eprint/127811

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