A Flexible Wearable Supernumerary Robotic Limb for Chronic Stroke Patients

Summary

This protocol introduces a flexible wearable supernumerary robotic limb tailored to assist in finger rehabilitation for stroke patients. The design incorporates a bending sensor to facilitate seamless human-robot interaction. Validation through experiments involving both healthy volunteers and stroke patients underscores the efficacy and dependability of the proposed study.

Abstract

In this study, we present a flexible wearable supernumerary robotic limb that helps chronic stroke patients with finger rehabilitation and grasping movements. The design of this innovative limb draws inspiration from bending pneumatic muscles and the unique characteristics of an elephant's trunk tip. It places a strong emphasis on crucial factors such as lightweight construction, safety, compliance, waterproofing, and achieving a high output-to-weight/pressure ratio. The proposed structure enables the robotic limb to perform both envelope and fingertip grasping. Human-robot interaction is facilitated through a flexible bending sensor, detecting the wearer's finger movements and connecting them to motion control via a threshold segmentation method. Additionally, the system is portable for versatile daily use. To validate the effectiveness of this innovation, real-world experiments involving six chronic stroke patients and three healthy volunteers were conducted. The feedback received through questionnaires indicates that the designed mechanism holds immense promise in assisting chronic stroke patients with their daily grasping activities, potentially improving their quality of life and rehabilitation outcomes.

Introduction

According to previous research¹, as of 2019, there were more than 100 million cases of stroke worldwide. Approximately two-thirds of these cases resulted in hemiplegic sequelae, and over 80% of severe hemiplegic stroke patients could not fully recover hand and arm function². Furthermore, the aging population is expected to continue growing in the coming decades, leading to a significant increase in the number of potential stroke victims. The persistent upper extremity impairments following a stroke can significantly affect activities of daily living (ADLs), and hand rehabilitation has been clinicall....

Protocol

This protocol has been approved by the Ethics Review Board of Union Hospital, Tongji Medical College, Huazhong University of Science and Technology. Patients with upper limb functional disorders who met the diagnostic criteria and were receiving treatment at the author's hospital's rehabilitation department outpatient and inpatient units were selected as participants. The patients' motor function recovery was assessed according to the Brunnstrom recovery stages²¹, and patients in stage.......

Discussion

This study presents an innovative, flexible, wearable supernumerary robotic limb designed to assist chronic stroke patients in finger rehabilitation and gripping tasks. This robotic system prioritizes portability and offers both envelope grasp and fingertip grasp functionalities. It incorporates a flexible bending sensor for user-friendly human-machine interaction control. Static grasping experiments validate the gripping capabilities of the designed mechanism in two distinct grasping modes. The study involves experiment.......

Materials

Name	Company	Catalog Number	Comments
Air Compressor	Xinweicheng	F35L-JJ-24V	Provide air supply for the pneumatic gripper
Arduino	Emakefun	Mega 2560	Single-chip microcomputer/data acquisition card
Backpack	Mujin		Integrating external devices
Flex Sensor	Spectra Symbol	Flex Sensor 2.2	Flexible bending sensors
Power supply	Yisenneng	YSN-37019200	Provide power
PU quick-plug connector	Elecall	PU-6	Connector for PU tube
PU tube	Baishehui	ZDmJKJJy	Air line connection
Silicone elastomer	Wacker	ELASTOSIL M4601 A/B	Material of the pneumatic gripper
Thermostatic chamber	Ruyi	101-00A	Constant temperature to accelerate the curing of silicone
Vacuum dryer	Fujiwara	PC-3	Further defoaming
Vacuum mixing and degassing machine	Smida	TMV-200T	Mix silicone thoroughly and get it defoamed
Valve	SMC	NTV1030-312CL	Control the air pressure