A Hybrid Soft Haptic Display for Rendering Lump Stiffness in Remote Palpation

TL;DR

This paper presents a hybrid soft haptic display that significantly improves the accuracy of remote lump detection in telemedicine by combining force and positional feedback, balancing realism and responsiveness.

Contribution

It introduces a novel hybrid fingertip display with three rendering strategies, demonstrating substantial accuracy improvements in lump detection over traditional force-only displays.

Findings

Hybrid methods increased detection accuracy from 50% to over 95%.

Hybrid B provided more realistic tactile feedback but may increase latency.

Trade-off identified between realism and real-time responsiveness.

Abstract

Remote palpation enables noninvasive tissue examination in telemedicine, yet current tactile displays often lack the fidelity to convey both large-scale forces and fine spatial details. This study introduces a hybrid fingertip display comprising a rigid platform and a $4\times4$ soft pneumatic tactile display (4.93 mm displacement and 1.175 N per single pneumatic chamber) to render a hard lump beneath soft tissue. This study compares three rendering strategies: a Platform-Only baseline that renders the total interaction force; a Hybrid A (Position + Force Feedback) strategy that adds a dynamic, real-time soft spatial cue; and a Hybrid B (Position + Preloaded Stiffness Feedback) strategy that provides a constant, pre-calculated soft spatial cue. In a 12-participant lump detection study, both hybrid methods dramatically improved accuracy over the Platform-Only baseline (from 50\% to over 95\%). While the Hybrid B was highlighted qualitatively for realism, its event-based averaging is expected to increase interaction latency in real-time operation. This suggests a trade-off between perceived lump realism and real-time responsiveness, such that rendering choices that enhance realism may conflict with those that minimize latency.