Radial force measurement of endovascular stents: Influence of stent design and diameter

Matsumoto, Takuya; Matsubara, Yutaka; Aoyagi, Yukihiko; Matsuda, Daisuke; Okadome, Jun; Morisaki, Koichi; Inoue, Kentarou; Tanaka, Shinichi; Ohkusa, Toshifumi; Maehara, Yoshihiko

doi:10.1177/1708538115590040

Cited by 18 publications

(11 citation statements)

References 21 publications

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“…Comparison to other carotid stents is limited by rare data in the literature, mostly derived at only one diameter 22 or from superficial femoral artery stents. 23 Both of these investigations showed relatively high radial forces compared to the presented data for the One-Size-Fits-All CGuard.…”

Section: Discussionmentioning

confidence: 60%

Initial Clinical Results and In Vitro Testing of the New CGuard MicroNet-Covered “One-Size-Fits-All” Carotid Stent

et al. 2019

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Purpose: To evaluate a MicroNet-covered stent designed for the carotid artery with the new ability to adjust to different vessel diameters. Materials and Methods: Thirty consecutive patients (mean age 72.1±7.7 years; 26 men) with symptomatic stenosis (86.3%±6.4%) of the internal carotid artery were treated with the new self-adjusting nitinol stent, which has a self-expanding, open-cell design covered by an outer conformable layer (MicroNet). The only stent used was the “One-Size-Fits-All” CGuard stent with lengths of 30 or 40 mm. In bench testing, the chronic outward force of the One-Size-Fits-All stent was determined with a segmented head radial force test device. The stent was deployed directly into the test device at a diameter of 5.0 mm, and the chronic outward force was measured up to 10.0 mm, the maximum expansion of the stent. Results: The stent was successfully implanted in all 30 patients without periprocedural complications, including no neurological events within 30 days. The chronic outward force normalized by stent length demonstrated a near-equivalent radial force outcome: The stent displayed only a minor difference between the minimal radial force at 9.0 mm (0.195 N/mm) and the maximal radial force at 5.5 mm (0.330 N/mm). Conclusion: The new self-adjusting, MicroNet-covered stent has high conformability combined with an almost equivalent radial force at expansion diameters ranging from 5.5 to 9.0 mm. The first clinical results demonstrate that the new One-Size-Fits-All stent can be safely implanted in internal carotid arteries with reference diameters within this range.

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Section: Discussionmentioning

confidence: 60%

Initial Clinical Results and In Vitro Testing of the New CGuard MicroNet-Covered “One-Size-Fits-All” Carotid Stent

et al. 2019

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“…The non-congruent results of the CR and RRF of the tested self-expanding stents are based on the different loading mechanisms of the test methods itself [2,8]. The resistance against flattening or radial deformation depends on the individual stent design.…”

Section: Resultsmentioning

confidence: 99%

Support function of self-expanding nitinol stents – Are radial resistive force and crush resistance comparable?

Brandt-Wunderlich

Schmidt

Grabow

et al. 2019

Current Directions in Biomedical Engineering

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The main task of any vascular stent is the mechanical support of the re-opened vessel. This support function may be quantified by the compressive properties of the stent in radial outer loading conditions. Different test methods are standardized and are accepted to provide relevant data. Six commercially available self-expanding stents were investigated with regard to their forcedeformation behavior during radial as well as elliptical deformation. The measured radial resistive force and crush resistance were not qualitatively congruent for all stents. As a conclusion both test methods should be considered when describing the compressive properties of self-expanding stents.

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“…This radial force was more than four times greater than the radial force measured when compressing two stents in parallel, based on a comparison between our present results and our previously reported results. 17 For this reason, the radial force placed on the TEVAR endoprosthesis increases the compression of the bare stent. Therefore, it is essential that the surgeon evaluates the possibility of stent deformities during and after surgery.…”

Section: Discussionmentioning

confidence: 99%

“…However, the radial force across the entire circumference of the GORE c-TAG stent when oversizing was significantly greater than that of other two TEVAR stents. 17 Further studies are needed to clarify the radial force between the bare stent and a GORE c-TAG stent when oversizing.…”

Section: Discussionmentioning

confidence: 99%

Radial forces of stents used in thoracic endovascular aortic repair and bare self-expanding nitinol stents measured ex vivo – Rapid rescue for obstruction of the innominate artery using bare self-expanding nitinol stents

et al. 2016

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Purpose Our objective was to compare the radial forces of several stents ex vivo to identify stents suitable for rescue of the unexpected coverage of aortic arch branches in thoracic endovascular aortic repair. Methods We measured the radial forces of two types of self-expanding bare nitinol stents (E-luminexx and Epic) used singly or as double-walled pairs, and of three endoprostheses used in thoracic endovascular aortic repair (TEVAR, Gore c-TAG, Relay, and Valiant) by compressing the stent using an MTS Instron universal testing machine (model #5582). We also examined the compressive effects of the TEVAR endoprostheses and the bare nitinol stents on each other. Results The radial force was greater in the center than at the edge of each stent. In all stents tested, the radial force decreased incrementally with increasing stent diameter. The radial force at the center was two times greater when using two stents than with a single stent. In the compression test, only E-luminexx used as a pair was not compressed after compressing a Relay endoprosthesis by 12 mm. Conclusion Two E-luminexx stents are appropriate to restore the blood flow if a TEVAR endoprosthesis covers the innominate artery following innominate-carotid-left subclavian arterial bypass.

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Radial force measurement of endovascular stents: Influence of stent design and diameter

Abstract: Differences in radial force depend on types of stents, site of deployment, and layer characteristics. In clinical settings, an understanding of the mechanical characteristics, including radial force, is important in choosing a stent for each patient.

Cited by 18 publications

References 21 publications

Initial Clinical Results and In Vitro Testing of the New CGuard MicroNet-Covered “One-Size-Fits-All” Carotid Stent

Initial Clinical Results and In Vitro Testing of the New CGuard MicroNet-Covered “One-Size-Fits-All” Carotid Stent

Support function of self-expanding nitinol stents – Are radial resistive force and crush resistance comparable?

Radial forces of stents used in thoracic endovascular aortic repair and bare self-expanding nitinol stents measured ex vivo – Rapid rescue for obstruction of the innominate artery using bare self-expanding nitinol stents

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