Motion Artifact‐Resilient Zone for Implantable Sensors

Abstract

The miniaturization and flexibility of wearable and implantable devices allow humans to carry them directly on or in their bodies, thus enabling these devices to measure biometric signals in real-time anywhere. However, as they are embedded or implanted into an actively moving human interface, motion artifact noise inevitably occurs. Typically, devices are laminated or implanted on body surfaces, but the positions of such devices cannot be designed without any discussion of the noise. Thus, this paper investigates an approach that minimizes the noise to achieve negligible motion artifacts in implantable micro-devices that have a specific angle on the surface of the body, while maintaining the function of sensor. The device with a specific angle successfully detects the target signal, while motion artifacts-such as tension, compression, and bending-disturb the measurement. The pulse signal on a wrist is well measured while the hand is rotating, and artificial skin implanted on a rat can distinguish external pressure from the movement noise. A thermometer sensor that follows the same rule is further examined. Therefore, this approach is expected to be useful in numerous areas including human interface-based medical devices, virtual reality, and health aids to improve quality of life.

Miniaturized Implantable Fluorescence Probes Integrated with Metal–Organic Frameworks for Deep Brain Dopamine Sensing

“…In addition, motion artifacts pose a significant challenge to brain implants due to the dynamic nature of brain tissue and the potential for displacement or deformation of intracranial implants. These artifacts may further be minimized by adjusting the implant angle to a noise-insensitive position 68 or by introducing engineered hydrogels as selective frequency dampers. 69 Meanwhile, more sophisticated animal experiments involving memory training, pharmacological stimulation, and social interaction must be implemented to explore the sensing performance and potential applications of the probe in complex brain environments.…”

Materials and Structural Designs toward Motion Artifact-Free Bioelectronics

“…298 Additionally, there are methods of differentiating dimensions of the sensor and noise stress, such as mounting a sensor at a specific angle to the noise generated in one direction, which gives insensitivity to noise. 52,299 In the case of multimodal sensors, it is possible to selectively measure specific signals by separating overlapped signals. 300−302 Lastly, as one of the stresses comes from friction, conformal contact, and good adhesion can also reduce noise.…”

Neuromodulation of the peripheral nervous system: Bioelectronic technology and prospective developments

“…Alongside the continuous advancement of neuromodulation devices, wireless power transmission technology is also developing rapidly. [142][143][144] A wireless wearable device requires a considerable amount of power, [145][146][147] including for data processing and wireless communication, such as with other devices. [148][149][150][151] While batteries and energy harvesting methods can serve as wireless power sources, they have disadvantages such as limited lifespan, the need for replacement, and insufficient power output.…”