Advanced Haptic Actuators and Wearable Sensory Substitution Systems

NU 2024-099

INVENTORS

• John Rogers*

SHORT DESCRIPTION

A novel wearable haptic device that leverages a bistable electromechanical design and the skin’s natural elastic energy to deliver both dynamic and static stimuli. This technology transmits a range of tactile sensations, including pressure and twisting motions, for immersive and assistive applications.

BACKGROUND

Conventional wearable haptic systems struggle to fully engage the nuanced mechanoreceptor network in human skin, limiting the quality and adaptability of sensory feedback in applications ranging from patient care to immersive virtual environments. The integration of bioelectronic interfaces with energy-recovery mechanisms addresses these challenges by offering a more efficient and responsive method to stimulate the diverse tactile receptors in the skin.

ABSTRACT

The presented technology is a compact, skin‐conformable device comprising a hexagonal array of miniaturized, bistable transducers encapsulated within a flexible silicone-mesh material. This system delivers controlled normal and shear forces that create both static and dynamic stimuli, effectively translating data from smartphone-based sensors into tactile feedback. Its design harnesses the elastic energy stored in the skin, enabling energy‐efficient operation and prolonged device use without continuous power input.

Systematic experimental and computational studies underpin the design, defining optimal conditions for interfacing with varied skin properties. This wireless haptic interface is engineered for applications such as sensory substitution, aiding individuals with visual impairments, and providing real-time assistive feedback for rehabilitation and immersive experiences.

APPLICATIONS

• Sensory substitution for vision-impaired users – Provides tactile cues to help navigate environments.
• Assistive feedback in prosthetics and rehabilitation – Enhances motor control with noninvasive sensory input.
• Immersive VR/AR and gaming experiences – Converts smartphone sensor data into realistic touch sensations.
• Wearable patient care monitoring – Delivers real-time biofeedback for improved healthcare delivery.

ADVANTAGES

• Energy-efficient operation – Uses a bistable design to minimize power consumption.
• High-density tactile feedback – Delivers both dynamic and static stimuli with precision.
• Adaptive and programmable stimuli – Customizes sensory responses based on user and application needs.
• Miniaturized and flexible construction – Ensures comfortable and seamless skin integration.

PUBLICATIONS

Rogers et al., Bioelastic state recovery for haptic sensory substitution, Nature, 06 November 2024, volume 635, pages345–352

IP STATUS

US Patent Pending

IN THE NEWS

New haptic patch transmits complexity of touch to the skin - Device delivers various sensations, including vibrations, pressure and twisting. Northwestern News, November 6, 2024 By Amanda Morris.