Ultrastretchable Kirigami Bioprobes

Morikawa, Yusuke; Yamagiwa, Shota; Sawahata, Hirohito; Numano, Rika; Koida, Kowa; Ishida, M.; Kawano, Takeshi

doi:10.1002/adhm.201701100

Cited by 136 publications

(147 citation statements)

References 23 publications

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“…[ 31,32 ] It has also been demonstrated that a kirigami‐based parylene film could conformally wrap the heart of a mouse, so that the sensing functions of the flexible electronics on it was enhanced. [ 33 ] These structures are usually realized passively by applying mechanical forces to form 3D configurations. However, the requirement of external force limits the potential applications of these morphing structures.…”

Section: Figurementioning

confidence: 99%

Kirigami‐Design‐Enabled Hydrogel Multimorphs with Application as a Multistate Switch

Hao

et al. 2020

Advanced Materials

108

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Morphing materials have promising applications in soft robots, intelligent devices, and so forth. Among the various design strategies, kirigami structures are recognized as a powerful tool to obtain sophisticated 3D configurations and unprecedented properties from planar designs on common materials. Here, some kirigami designs are demonstrated for programmable, multistable 3D configurations from composite hydrogel sheets. Via photolithographic polymerization, perforated composite hydrogel sheets are fabricated, in which soft and active hydrogel strips are patterned in stiff and passive hydrogel frames. When immersed in water, the gel strips buckle out of plane due to swelling mismatch. In the kirigami structures, the geometric continuity is disrupted by the introduction of cutouts, and thus the degrees of deformation freedom increases remarkably. Multiple configurations are obtained in a single composite hydrogel by controlling the buckling direction of each strip. Multitier configurations are also obtained by using a hierarchically designed kirigami structure. A multicontact switch of an electric circuit is designed by harnessing the multitier gel configurations. Furthermore, a rotation mode is realized by introducing chirality in the kirigami design. The versatile design of the kirigami structure for programmable deformations should be applicable for other intelligent materials toward promising applications in biomedical devices and flexible electronics.

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Section: Figurementioning

confidence: 99%

Kirigami‐Design‐Enabled Hydrogel Multimorphs with Application as a Multistate Switch

Hao

et al. 2020

Advanced Materials

108

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“…Another advantage of kirigami is that it could transform a variety of advanced materials and planar systems, that were previously limited in application, into mechanically tunable 2D and 3D architectures with broad geometric diversity . Kirigami techniques have been applied in a broad range of areas, including integrated solar tracking, deployable reflectors, energy storage devices, mechanical actuators, sensors, triboelectric nanogenerators, and stretchable electronics, such as conductors, supercapacitors, transistors, and bioprobes, and the stretchability can reach as high as 400% without degradation of intrinsic properties.…”

Section: Introductionmentioning

confidence: 99%

Stretchable Piezoelectric Sensing Systems for Self‐Powered and Wireless Health Monitoring

Sun

Carreira

Chen

et al. 2019

Adv Materials Technologies

111

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Wearable electronics are attracting increasing attention as recent developments in materials, mechanics, and manufacturing techniques create new opportunities for the integration of high-quality electronic systems into a single miniaturized Continuous monitoring of human physiological signals is critical to managing personal healthcare by early detection of health disorders. Wearable and implantable devices are attracting growing attention as they show great potential for real-time recording of physiological conditions and body motions. Conventional piezoelectric sensors have the advantage of potentially being self-powered, but have limitations due to their intrinsic lack of stretchability. Herein, a kirigami approach to realize a novel stretchable strain sensor is introduced through a network of cut patterns in a piezoelectric thin film, exploiting the anisotropic and local bending that the patterns induce. The resulting pattern simultaneously enhances the electrical performance of the film and its stretchability while retaining the mechanical integrity of the underlying materials. The power output is enhanced from the mechanoelectric piezoelectric sensing effect by introducing an intersegment, through-plane, electrode pattern. By additionally integrating wireless electronics, this sensing network could work in an entirely battery-free mode. The kirigami stretchable piezoelectric sensor is demonstrated in cardiac monitoring and wearable body tracking applications. The integrated soft, stretchable, and biocompatible sensor demonstrates excellent in vitro and ex vivo performances and provides insights for the potential use in myriad biomedical and wearable health monitoring applications.

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“…Low effective modulus comparable to that of biological tissues has been achieved using a kirigami structure (≈23 and ≈3.6 kPa) and a mesh structure (≈4 kPa) . These two devices exhibit high stretchability under high strain and low effective modulus.…”

mentioning

confidence: 99%

“…The low effective modulus of these devices enables the minimization of the device‐induced physical stress to biological tissues caused by the device placement, compared to conventional elastomer‐based stretchable devices (e.g., PDMS) . Using a stable device material [e.g., parylene and Styrene‐butadiene‐styrene,] of the above‐mentioned devices offer device stability to biofluids. However, kirigami and mesh structures are not able to solve other problems, such as microelectrode displacement over the wet surface of a tissue …”

mentioning

confidence: 99%

Donut‐Shaped Stretchable Kirigami: Enabling Electronics to Integrate with the Deformable Muscle

Morikawa

Yamagiwa

Sawahata

et al. 2019

Adv Healthcare Materials

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Electronic devices used to record biological signals are important in neuroscience, brain–machine interfaces, and medical applications. Placing electronic devices below the skin surface and recording the muscle offers accurate and robust electromyography (EMG) recordings. The device stretchability and flexibility must be similar to the tissues to achieve an intimate integration of the electronic device with the biological tissues. However, conventional elastomer‐based EMG electrodes have a Young's modulus that is ≈20 times higher than that of muscle. In addition, these stretchable devices also have an issue of displacement on the tissue surface, thereby causing some challenges during accurate and robust EMG signal recordings. In general, devices with kirigami design solve the issue of the high Young's modulus of conventional EMG devices. In this study, donut‐shaped kirigami bioprobes are proposed to reduce the device displacement on the muscle surface. The fabricated devices are tested on an expanding balloon and they show no significant device (microelectrode) displacement. As the package, the fabricated device is embedded in a dissolvable material‐based scaffold for easy‐to‐use stretchable kirigami device in an animal experiment. Finally, the EMG signal recording capability and stability using the fabricated kirigami device is confirmed in in vivo experiments without significant device displacements.

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Ultrastretchable Kirigami Bioprobes

Cited by 136 publications

References 23 publications

Kirigami‐Design‐Enabled Hydrogel Multimorphs with Application as a Multistate Switch

Kirigami‐Design‐Enabled Hydrogel Multimorphs with Application as a Multistate Switch

Stretchable Piezoelectric Sensing Systems for Self‐Powered and Wireless Health Monitoring

Donut‐Shaped Stretchable Kirigami: Enabling Electronics to Integrate with the Deformable Muscle

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