Electrotactile display composed of two-dimensionally and densely distributed microneedle electrodes

Tezuka, Mayuko; Ishimaru, K.; Miki, Norihisa

doi:10.1016/j.sna.2017.02.021

Cited by 14 publications

(17 citation statements)

References 22 publications

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“…Given that the different types of mechanoreceptors distributed in the glabrous skin respond to mechanical pressure, vibration, or deformation, 216 through pressures/forces applied by actuators, thus reproducing the true nature of the sense of touch. 186 The request for soft materials has led to focus on polymer-based dielectric elastomers because of their cost-effective fabrication techniques and their flexibility and elastic properties similar to those of human skin, allowing adhesion on body surfaces. Also Shape Memory Alloys (SMAs) platforms could be of interest for the development of haptic devices because of their capability to stretch skin once attached, creating shear forces similar to light pinches.…”

Section: Conformable Devices For Mechanical Stimulationmentioning

confidence: 99%

“…Wei et al also reported the functional properties of carbon-based materials in lowering the skin impedance 184. With a different approach, Tezuka et al avoided the stratum corneum high impedance by implementing microneedles for their tactile displays for electrotactile stimulation 185,186. The authors used chemical etching of titanium wires with the tip protruding from a soft embedding matrix (PI or Ecoflex) to prepare a matrix 600 µm tall sharp cones (with a 300 µm diameter at the base).…”

mentioning

confidence: 99%

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Conformable on-skin devices for thermo-electro-tactile stimulation: materials, design, and fabrication

2021

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Section: Conformable Devices For Mechanical Stimulationmentioning

confidence: 99%

mentioning

confidence: 99%

Conformable on-skin devices for thermo-electro-tactile stimulation: materials, design, and fabrication

2021

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“…Owing to their short height, they are considered painless and can be considered a minimally invasive device. Applications of microneedle patches include transdermal drug delivery (vaccines 1 , insulin 2 ), chemical biosensing (glucose 3 , DNA biomarkers 4 ), electrical biosignal recording (electrocardiography 5 , surface electromyography 6 , intramuscular electromyography 7 , electroencephalography 8 ), electrical stimulation (electrotactile display 9 ), and as neural interfaces 10 . Depending on the requirement, microneedles may be solid 11 , coated 12 , hollow 13 , porous 14 , hydrogel based 15 /swellable 16 , or of a merged-tip geometry 17 .…”

Section: Introductionmentioning

confidence: 99%

Simple and customizable method for fabrication of high-aspect ratio microneedle molds using low-cost 3D printing

et al. 2019

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We present a simple and customizable microneedle mold fabrication technique using a low-cost desktop SLA 3D printer. As opposed to conventional microneedle fabrication methods, this technique neither requires complex and expensive manufacturing facilities nor expertise in microfabrication. While most low-cost 3D-printed microneedles to date display low aspect ratios and poor tip sharpness, we show that by introducing a two-step “Print & Fill” mold fabrication method, it is possible to obtain high-aspect ratio sharp needles that are capable of penetrating tissue. Studying first the effect of varying design input parameters and print settings, it is shown that printed needles are always shorter than specified. With decreasing input height, needles also begin displaying an increasingly greater than specified needle base diameter. Both factors contribute to low aspect ratio needles when attempting to print sub-millimeter height needles. By setting input height tall enough, it is possible to print needles with high-aspect ratios and tip radii of 20–40 µm. This tip sharpness is smaller than the specified printer resolution. Consequently, high-aspect ratio sharp needle arrays are printed in basins which are backfilled and cured in a second step, leaving sub-millimeter microneedles exposed resulting microneedle arrays which can be used as male masters. Silicone female master molds are then formed from the fabricated microneedle arrays. Using the molds, both carboxymethyl cellulose loaded with rhodamine B as well as polylactic acid microneedle arrays are produced and their quality examined. A skin insertion study is performed to demonstrate the functional capabilities of arrays made from the fabricated molds. This method can be easily adopted by the microneedle research community for in-house master mold fabrication and parametric optimization of microneedle arrays.

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“…Later, Tezuka et al [ 8 , 9 ] further studied electro-tactile stimulation and developed a sheet-type electro-tactile device with microneedle electrodes to transfer information. The device is capable of increasing the variety of tactile sensations and the amount of available information with a low voltage.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to touching and perceiving tactile rendering through the fingertip [ 10 , 11 , 12 , 13 ], the lips [ 14 ], tongue [ 15 , 16 , 17 ], forehead [ 18 ], abdomen [ 19 ], forearm [ 8 ], back [ 20 ] and residual nerves [ 21 ] also have been utilized to express information. These various tactile displays are usually obstructive because of the invasiveness of the stimulation or the large dimension being a burden to a healthy person.…”

Section: Introductionmentioning

confidence: 99%

Experiment Study for Wrist-Wearable Electro-Tactile Display

Lin

Wang

et al. 2021

Sensors

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Tactile sensation is a promising information display channel for human beings that involves supplementing or replacing degraded visual or auditory channels. In this paper, a wrist-wearable tactile rendering system based on electro-tactile stimulation is designed for information expression, where a square array with 8 × 8 spherical electrodes is used as the touch panel. To verify and improve this touch-based information display method, the optimal mode for stimulus signals was firstly investigated through comparison experiments, which show that sequential stimuli with consecutive-electrode-in-active mode have a better performance than those with single-electrode-in-active mode. Then, simple Chinese and English characters and 26 English characters’ recognition experiments were carried out and the proposed method was verified with an average recognition rate of 95% and 82%, respectively. This wrist-wearable tactile display system would be a new and promising medium for communication and could be of great value for visually impaired people.

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Electrotactile display composed of two-dimensionally and densely distributed microneedle electrodes

Cited by 14 publications

References 22 publications

Conformable on-skin devices for thermo-electro-tactile stimulation: materials, design, and fabrication

Conformable on-skin devices for thermo-electro-tactile stimulation: materials, design, and fabrication

Simple and customizable method for fabrication of high-aspect ratio microneedle molds using low-cost 3D printing

Experiment Study for Wrist-Wearable Electro-Tactile Display

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