A Study of Buckling and Snapping Under Dynamic Load

Lock, M. H.

doi:10.21236/ad0666914

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…Therefore, an average diameter 185 (defined as the mean of the smallest and largest number given in Table B2) was calculated. The curve radii and 186 bifurcation angles have been estimated based on illustrations and data in [8][9][10][11][12][13][14][15][16][17][18][19] , and are given in Tables B3 and B4, 187 respectively. 188…”

Section: Author Contributionsmentioning

confidence: 99%

Crossing Total Occlusions using a hydraulic pressure wave: a feasibility study

Sakes¹,

Nicolai²,

Karapanagiotis³

et al. 2018

Biomed. Phys. Eng. Express

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Crossing highly calcified occlusions is technically challenging mainly due to guidewire buckling. In an effort to prevent buckling, a catheter that uses a dynamic impulse load is proposed. The proposed Wave catheter consists of an input plunger to generate an impulse at the handle, a hydraulic pressure wave confined within a Ø2 mm catheter to transfer the impulse towards the tip, and an output plunger to transfer the impulse to the occlusion. To determine the feasibility of this catheter, an experiment was performed in which the input and output impulses were recorded as a function of the catheter type, curvature, and plunger travel distance. Additionally, the system was tested on artificial CTO models to determine the clinical validity. The catheter has illustrated the ability to safely transfer high-force impulses of up to 43N (1.5 N required) with only minimum catheter type and no curvature dependency, allowing for delivering high-force impulses through tortuous vasculature and under any angle. Furthermore, the catheter was able to penetrate the artificial CTO models within 1 strike.

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Section: Author Contributionsmentioning

confidence: 99%

Crossing Total Occlusions using a hydraulic pressure wave: a feasibility study

Sakes¹,

Nicolai²,

Karapanagiotis³

et al. 2018

Biomed. Phys. Eng. Express

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show abstract

“…Lock [13] found that if the load duration (dt) is sufficiently small (i.e., the step load becomes an impulsive load), a column can sustain higher loads than under static loading. In other words, in dynamic loading conditions, the impulse imparted to the structure rather than the size of the load becomes the most significant load parameter (see Budiansky in [14] for an analytical description).…”

Section: Dynamic Loadingmentioning

confidence: 99%

Buckling prevention strategies in nature as inspiration for improving percutaneous instruments: a review

2016

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A typical mechanical failure mode observed in slender percutaneous instruments, such as needles and guidewires, is buckling. Buckling is observed when the axial compressive force that is required to penetrate certain tissue types exceeds the critical load of the instrument and manifests itself by sudden lateral deflection of the instrument. In nature, several organisms are able to penetrate substrates without buckling while using apparatuses with diameters smaller than those of off-the-shelf available percutaneous needles and guidewires. In this study we reviewed the apparatuses and buckling prevention strategies employed by biological organisms to penetrate substrates such as wood and skin. A subdivision is made between buckling prevention strategies that focus on increasing the critical load of the penetration tool and strategies that focus on decreasing the penetration load of the substrate. In total, 28 buckling prevention strategies were identified and categorized. Most organisms appear to be using a combination of buckling prevention strategies simultaneously. Integration and combination of these biological buckling prevention strategies in percutaneous instruments may contribute to increasing the success rate of percutaneous interventions.

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“…Lock et al [180] showed that dynamic loads, such as step loads and impulses, much in the excess of static buckling loads can be applied on the penetration tool, as long as they are removed fast enough. Therefore, the high-speed impact force tools, such as used in the axially vibrating Vibrational Angioplasty Device (Medical Miracles, UK), Crosser catheter (FlowCardia, Sunnyvale, CA; designed for peripheral chronic occlusions), and the device proposed by Rubenchik et al [61], may have an increased buckling resistance over the static tools.…”

Section: ) Increase the Applied Forcementioning

confidence: 99%