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Tactile and Chemical Senses

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.

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Updated: Aug 10, 2025

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing

Published on: October 20, 2021

An implantable wireless tactile sensing system.

Lin Du^1,2, Han Hao¹, Yixiao Ding¹

¹Department of Electrical and Systems Engineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, PA 19104, USA.

Research Square

|February 13, 2023

Summary

This summary is machine-generated.

Researchers developed an implantable tactile sensor for restoring hand function. This miniature device provides precise fingertip force measurement, enabling potential for brain-encoded sensory feedback in neuroprosthetics.

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Area of Science:

Biomedical Engineering
Neuroscience
Materials Science

Background:

Restoring hand function after amputation or paralysis is crucial for quality of life.
Current wearable tactile sensors are suboptimal for neuroprosthetic systems aiming to reanimate a patient's own hand.
There is a need for advanced implantable sensing solutions for seamless integration with neural interfaces.

Approach:

Developed a miniature implantable tactile sensing system for subdermal placement.
The system integrates a microfabricated capacitive force sensor, a custom integrated circuit for wireless power and data transmission, and a hermetic silica package.
Validated the device through simulations, benchtop, and ex vivo primate hand testing.

Key Points:

The implantable sensor accurately measured skin forces with a resolution of 4.3 mN in fingertip placement.
The system is designed for potential integration with microstimulation for brain-encoded tactile feedback.
This technology establishes foundational capabilities for diverse implantable sensing applications.

Conclusions:

The novel implantable tactile sensor offers a promising solution for restoring hand sensation in neuroprosthetic applications.
The developed system advances the field of implantable biosensors and neural interfaces.
This research paves the way for enhanced sensory feedback in prosthetic devices and other implantable technologies.