Auxetic Coronary Stent Endoprosthesis: Fabrication and Structural Analysis

Amin, Faisal; Ali, Murtaza Najabat; Ansari, Umair; Mir, Mariam; Minhas, Muhammad Asim; Shahid, Wakeel

doi:10.5301/jabfm.5000213

Cited by 33 publications

(16 citation statements)

References 13 publications

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“…One example of a suggested macroscale application is in stents for medical use. In procedures requiring esophageal stents, [ 189 ] it has been shown that rotating rigid units could be used for their auxetic properties with the expectation that once it reaches the desired position, a deformation induces a mechanism that would increase the size of the stent radially and consequently longitudinally, therefore making the insertion less invasive and the implementation range higher. It was found that semi‐rigid units would probably make better candidates as the produced samples failed early when fully rigid samples were used.…”

Section: Applications and Implementationsmentioning

confidence: 99%

Auxetic Behavior and Other Negative Thermomechanical Properties from Rotating Rigid Units

Grima‐Cornish

Attard

Grima

et al. 2021

Physica Rapid Research Ltrs

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Auxetics display the anomalous property of expanding laterally when uniaxially stretched, that is, a negative Poisson's ratio, a property that arises from 1) the presence of specific geometric features within the nano/macrostructure of the material and 2) amenable deformations in response to the applied stimulus. Herein, how ancient symmetrical esthetic artifacts have been transformed to functional auxetics through mechanisms that have ripened the field of “mechanical metamaterials” and “architected materials” in the last decades is explored. In particular, the important role and various implementations, both in 2D and 3D, of “rotating rigid units,” which range from “rotating squares” to much more complex renditions at various scales of structure, are looked at. The role of rotating rigid units to generate negative thermal expansion and negative compressibility is also delved into.

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Section: Applications and Implementationsmentioning

confidence: 99%

Auxetic Behavior and Other Negative Thermomechanical Properties from Rotating Rigid Units

Grima‐Cornish

Attard

Grima

et al. 2021

Physica Rapid Research Ltrs

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“…Applying NPR structure to vascular stent can reduce the radial and longitudinal size of stent simultaneously when the stent is crimped, which is beneficial to minimally invasive implantation. And the vascular stent can expand in both radial and longitudinal direction, which allows good anchorage with arterial walls [30]. …”

Section: Experiments and Methodsmentioning

confidence: 99%

Radial Compressive Property and the Proof-of-Concept Study for Realizing Self-expansion of 3D Printing Polylactic Acid Vascular Stents with Negative Poisson’s Ratio Structure

Zhao

et al. 2018

Materials

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Biodegradable stents offer the potential to reduce the in-stent restenosis by providing support long enough for the vessel to heal. The polylactic acid (PLA) vascular stents with negative Poisson’s ratio (NPR) structure were manufactured by fused deposition modeling (FDM) 3D printing in this study. The effects of stent diameter, wall thickness and geometric parameters of arrowhead NPR structure on radial compressive property of 3D-printed PLA vascular stent were studied. The results showed that the decrease of stent diameter, the increase of wall thickness and the increase of the surface coverage could enhance the radial force (per unit length) of PLA stent. The radial and longitudinal size of PLA stent with NPR structure decreased simultaneously when the stent was crimped under deformation temperature. The PLA stent could expand in both radial and longitudinal direction under recovery temperature. When the deformation temperature and recovery temperature were both 65 °C, the diameter recovery ratio of stent was more than 95% and the maximum could reach 98%. The length recovery ratio was above 97%. This indicated the feasibility of utilizing the shape memory effect (SME) of PLA to realize the expansion of 3D-printed PLA vascular stent under temperature excitation.

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“…One of such studies [13] was devoted to the development of a new auxetic geometry coronary stent based on 316L medical grade stainless steel, manufactured by laser cutting. The peculiarity of this design allows the stent to retain a certain lumen volume due to simultaneous expansion in two directions under the action of the balloon being inflated.…”

Section: Stentsmentioning

confidence: 99%

Auxetic Metamaterials for Biomedical Devices: Current Situation, Main Challenges, and Research Trends

et al. 2022

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Auxetic metamaterials are characterized by a negative Poisson ratio (NPR) and display an unexpected property of lateral expansion when stretched and densification when compressed. Auxetic properties can be achieved by designing special microstructures, hence their classification as metamaterials, and can be manufactured with varied raw materials and methods. Since work in this field began, auxetics have been considered for different biomedical applications, as some biological tissues have auxetic-like behaviour due to their lightweight structure and morphing properties, which makes auxetics ideal for interacting with the human body. This research study is developed with the aim of presenting an updated overview of auxetic metamaterials for biomedical devices. It stands out for providing a comprehensive view of medical applications for auxetics, including a focus on prosthetics, orthotics, ergonomic appliances, performance enhancement devices, in vitro medical devices for interacting with cells, and advanced medicinal clinical products, especially tissue engineering scaffolds with living cells. Innovative design and simulation approaches for the engineering of auxetic-based products are covered, and the relevant manufacturing technologies for prototyping and producing auxetics are analysed, taking into consideration those capable of processing biomaterials and enabling multi-scale and multi-material auxetics. An engineering design rational for auxetics-based medical devices is presented with integrative purposes. Finally, key research, development and expected technological breakthroughs are discussed.

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Auxetic Coronary Stent Endoprosthesis: Fabrication and Structural Analysis

Cited by 33 publications

References 13 publications

Auxetic Behavior and Other Negative Thermomechanical Properties from Rotating Rigid Units

Auxetic Behavior and Other Negative Thermomechanical Properties from Rotating Rigid Units

Radial Compressive Property and the Proof-of-Concept Study for Realizing Self-expansion of 3D Printing Polylactic Acid Vascular Stents with Negative Poisson’s Ratio Structure

Auxetic Metamaterials for Biomedical Devices: Current Situation, Main Challenges, and Research Trends

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