Miniaturized Pneumatic Actuator Array for Multipoint Deep Pressure Tactile Stimulation

2026-02-21

AI Summary

This work addresses the challenge of delivering multipoint, high-force (>1 N) deep pressure tactile stimulation in wearable haptic devices without compromising miniaturization or user comfort. The authors propose a miniature pneumatic actuator array fabricated from thermoplastic-coated fabric, featuring a shared folded fluidic channel architecture created via a single-step thermoforming process. This design eliminates the need for sacrificial barrier layers and enables a high-density layout with 8 mm diameter actuators spaced only 1 mm apart. Under a driving pressure of 230 kPa, the array achieves a blocking force of 2.1 N, enabling distinguishable and superimposable tactile stimuli. Furthermore, it supports fine modulation of stimulus amplitude down to the just-noticeable difference, making it well-suited for fingertip-worn haptic applications.

Technology Category

• Humans and AI: Interaction Techniques and Devices
• Intelligent Robots: Manipulation
• Machine Learning: Hardware-aware ML

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Experiences and lessons learnt from Web-based algorithms and system deployments
• User Modeling, Personalization and Recommendation: On-Device user modeling, personalization, and recommendation
• Responsible Web: Human-perceived consequences of algorithmic deployment on the web

Abstract

Wearable distributed tactile devices aim to provide multipoint touch stimuli, but struggle to provide sufficient forces (> 1 N) at frequencies to invoke deep pressure sensation with minimal encumbrance at small scales. This work presents a method of fabricating arrays of pneumatic actuators from thermoplastic-coated textiles. By routing pneumatic inlets to a common fold line in the fabric, we demonstrate that multiple pneumatic pouch actuators can be formed in a single simple heat-pressing operation that does not require the use of sacrificial blocking layers. The method accommodates a range of actuator diameters and spacing distances, including as compact as 8 mm diameter actuators spaced 1 mm apart, which enables use in fingertip wearable devices. In a blocked force test, these small pneumatic textile actuators exert 2.1 N when pressurized to 230 kPa. With this pair of actuators, we demonstrate an example application in which we invoke both distinct and summative stimuli, suggesting the possibility of titrating just noticeable difference in amplitude with a textile actuator array.

Problem

• wearable tactile devices
• deep pressure sensation
• multipoint stimulation
• miniaturized actuators
• force delivery

Innovation

• pneumatic actuator array
• textile-based fabrication
• deep pressure tactile stimulation
• wearable haptics
• heat-pressing manufacturing