A Planar, Multisensing Wearable Health Monitoring Device Integrated with Acceleration, Temperature, and Electrocardiogram Sensors

Yamamoto, Daisuke; Nakata, Satoshi; Kanao, Kenichiro; Arie, Takayuki; Akita, Seiji; Takei, Kuniharu

doi:10.1002/admt.201700057

Cited by 40 publications

(29 citation statements)

References 30 publications

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Section: Various Categories Of Flexible Sensorsmentioning

confidence: 99%

“…Nevertheless, limb movements are not always correlated with overall physical activities, hence resulting in probably inaccurate diagnosis in combination with the recorded health data. Inspired by the kirigami structure, a three‐axis acceleration sensor was developed composed of four beams integrated with three strain sensors in response to changes in structural strain (Figure h–j) . The introduction of kirigami structure hinders the stretching induced mechanical and electrical failures and meanwhile improves the comfort for wearers.…”

Section: Various Categories Of Flexible Sensorsmentioning

confidence: 99%

“…It is found that the threshold acceleration of the motion sensor is about 5–12 m s −2 , determined by the direction of acceleration . Through the rational tuning of structural dimensions, a sufficiently low acceleration threshold less than 3 m s −2 is obtained at the beam length ( L ) of 10.7 mm and width ( W ) of 0.35 mm, enabling its possibility to detect light human activity, such as small steps (Figure k,l) . To make the acceleration sensor adaptable to a wide range of people, the further device developments are demanded to obtain desired detectable threshold ( D Threshold ) based on the following relationship

D_{Threshold} \propto L^{2.7} / W

…”

Section: Various Categories Of Flexible Sensorsmentioning

confidence: 99%

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Multifunctional Skin‐Inspired Flexible Sensor Systems for Wearable Electronics

Takei

2019

Adv Materials Technologies

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483

332

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Skin‐inspired wearable devices hold great potentials in the next generation of smart portable electronics owing to their intriguing applications in healthcare monitoring, soft robotics, artificial intelligence, and human–machine interfaces. Despite tremendous research efforts dedicated to judiciously tailoring wearable devices in terms of their thickness, portability, flexibility, bendability as well as stretchability, the emerging Internet of Things demand the skin‐interfaced flexible systems to be endowed with additional functionalities with the capability of mimicking skin‐like perception and beyond. This review covers and highlights the latest advances of burgeoning multifunctional wearable electronics, primarily including versatile multimodal sensor systems, self‐healing material‐based devices, and self‐powered flexible sensors. To render the penetration of human‐interactive devices into global markets and households, economical manufacturing techniques are crucial to achieve large‐scale flexible systems with high‐throughput capability. The booming innovations in this research field will push the scientific community forward and benefit human beings in the near future.

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Section: Various Categories Of Flexible Sensorsmentioning

confidence: 99%

Section: Various Categories Of Flexible Sensorsmentioning

confidence: 99%

D_{Threshold} \propto L^{2.7} / W

…”

Section: Various Categories Of Flexible Sensorsmentioning

confidence: 99%

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Multifunctional Skin‐Inspired Flexible Sensor Systems for Wearable Electronics

Takei

2019

Adv Materials Technologies

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483

332

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“…Our approach to the design of multifunctional strain sensors will lead to the development of cost-effective and well-integrated multifunctional wearable devices. C 2019, 5, 17 2 of 16the development of mobile devices where increasing functionalities are being integrated into single devices, multifunctional wearable devices [2,10,11] open new tech logical possibilities in areas such as human-machine interaction, health monitoring and drug delivery [12]. For example, a single device might be fabricated which can simultaneously deliver drugs and monitor the physiological response.…”

mentioning

confidence: 99%

A Multifunctional Wearable Device with a Graphene/Silver Nanowire Nanocomposite for Highly Sensitive Strain Sensing and Drug Delivery

Shi

Liu

Kopecki

et al. 2019

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Advances in wearable, highly sensitive and multifunctional strain sensors open up new opportunities for the development of wearable human interface devices for various applications such as health monitoring, smart robotics and wearable therapy. Herein, we present a simple and cost-effective method to fabricate a multifunctional strain sensor consisting of a skin-mountable dry adhesive substrate, a robust sensing component and a transdermal drug delivery system. The sensor has high piezoresisitivity to monitor real-time signals from finger bending to ulnar pulse. A transdermal drug delivery system consisting of polylactic-co-glycolic acid nanoparticles and a chitosan matrix is integrated into the sensor and is able to release the nanoparticles into the stratum corneum at a depth of~60 µm. Our approach to the design of multifunctional strain sensors will lead to the development of cost-effective and well-integrated multifunctional wearable devices. C 2019, 5, 17 2 of 16the development of mobile devices where increasing functionalities are being integrated into single devices, multifunctional wearable devices [2,10,11] open new tech logical possibilities in areas such as human-machine interaction, health monitoring and drug delivery [12]. For example, a single device might be fabricated which can simultaneously deliver drugs and monitor the physiological response. Despite the clear promise of such multifunctional wearable devices, further improvements related to the fabrication process and cost-effectiveness are needed for their adoption.In terms of materials selection, there have been various approaches utilizing nanomaterials (e.g., silver nanowires [13], carbon nanotubes [14] and chemical vapor deposition (CVD) graphene [15]) as sensing components and elastomeric polymers or textiles as flexible and stretchable substrates [16,17]. Graphene nanoplatelets (GnPs) have been widely used in various polymer nanocomposites because of their superior electrical and mechanical properties [18][19][20]. Each GnP is typically 2-5 nm in thickness and may contain 3-10 graphene layers [21]. Upon reaching the percolation threshold in a matrix, the individual GnP forms a physically connected network where the overall resistance of the nanocomposites becomes limited by the interlayer contact resistance of the GnPs [4,22]. A strategy to reduce the contact resistance is to combine GnPs with silver nanowires (AgNWs). AgNWs employed in this work are around 40 nm in diameter and 20-60 µm in length. Under low strain, nanowires might change wave amplitudes and slide across each other, thus facilitating and maintaining a conducting network to accommodate the strain [23].Transdermal drug delivery is a promising drug delivery strategy to complement the limitations of traditional oral-and injectable-based methods. Transdermal drug delivery might potentially realize convenient and painless drug delivery and a sustained release profile with reduced side effects [24]. Advances in nanotechnology have led to the development of drug nanocarriers whi...

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“…The past decade has witnessed rapid advances in stretchable electronics, an emerging class of electronics, which can maintain their electrical or optoelectronic functions while mechanically stretched at a level (>>1%) far greater than most of the materials' intrinsic fracture limit . Realized through the combinations of materials, device layouts, and mechanical structure designs, stretchable electronics have a broad range of applications in areas ranging from wearable photovoltaics, to personal health monitors, to sensitive robotic skin prosthetics, to soft surgical tools, and to electronic “eyeball” imaging devices . In all of these cases, mechanical stretchability is a key, enabling characteristic.…”

mentioning

confidence: 99%

Biaxially Stretchable Ultrathin Si Enabled by Serpentine Structures on Prestrained Elastomers

Sim

Song

et al. 2018

Adv Materials Technologies

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most of the materials' intrinsic fracture limit. [1][2][3][4][5] Realized through the combinations of materials, device layouts, and mechanical structure designs, stretchable electronics have a broad range of applications in areas ranging from wearable photo voltaics, to personal health monitors, to sensitive robotic skin prosthetics, to soft surgical tools, and to electronic "eyeball" imaging devices. [6][7][8][9][10] In all of these cases, mechanical stretchability is a key, enabling characteristic. Recent advances in material design and synthesis have led to many stretchable polymeric functional materials such as conductors, [11][12][13] semiconductors, [14,15] mechanophores, [16,17] etc., which provide immediate outlets to stretchable electronics. [13][14][15]18] In particular, from the perspective of electronics performance, among all kinds of stretchable electronics, those employing inorganic materials are especially attractive since they are able to offer a high profile of device performance besides their mechanical merits for applications such as biomedical instruments, where high performance is required.To date, many studies have reported on developing stretchable inorganic semiconductors from materials, such as Si, which are intrinscally brittle. One prevalent strategy is the prestrain strategy, in which very thin stiff films are first bonded or deposited on a prestretched elastomer substrate and then the prestrain on the elastomer is released resulting in simultaneously generated surface microstructures. The prestrain strategy has been successfully adopted to generate stretchable Si-based electronics, which represents a way of exploiting out-of-plane deformation to induce stretchability. [19][20][21][22][23][24][25][26][27] In this case, the stretchability is limited to the prestrain applied on the elastomer substrate; the thin films become flattened when stretched at the same extent of the prestrain, and further stretching will induce fracture. In addition, most of the reported devices were generated by uniaxial prestrains on materials in the configuration of thin films, ribbons, or wires. [19][20][21][22][23][24] Thin films bonded with prestretched elastomer substrate along biaxes give rise to undefined surface topographies depending upon the orders of the prestrain relaxation.The other widely adopted strategy, which lies in constructing devices in the configuration of thin serpentine interconnects with island shaped Si functional electronics, has been explored for stretchable electronics, where in-plane geometries of the thin serpentine wires enable stretchability. [28][29][30] In this case, the stretchability simply depends on the ratio of contour length Building stretchable electronics from inorganic materials is a testified pathway toward devices with high performances for many applications in fields such as optoelectronics, biomedical, etc. Owing to the unstretchable nature of these materials (e.g., brittleness of Si), existing ways to enable stretchabilities mainly involve either bonding thin f...

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A Planar, Multisensing Wearable Health Monitoring Device Integrated with Acceleration, Temperature, and Electrocardiogram Sensors

Cited by 40 publications

References 30 publications

Multifunctional Skin‐Inspired Flexible Sensor Systems for Wearable Electronics

Multifunctional Skin‐Inspired Flexible Sensor Systems for Wearable Electronics

A Multifunctional Wearable Device with a Graphene/Silver Nanowire Nanocomposite for Highly Sensitive Strain Sensing and Drug Delivery

Biaxially Stretchable Ultrathin Si Enabled by Serpentine Structures on Prestrained Elastomers

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