# Experimental investigation of a powered lifting assistance device introducing direct touch between the caregiver and the care receiver

## TL;DR

This paper presents a new lifting assistance device that allows caregivers to intuitively adjust a patient's position using cables, with successful results in experiments and positive user feedback.

## Contribution

A novel lifting assistance device concept that enables intuitive, touch-based adjustments through cable tension detection.

## Key findings

- The device successfully detected caregiver intentions and adjusted the care receiver's position with over 70% accuracy.
- Both experienced and inexperienced caregivers gave high ratings to the value of direct touch in the device.
- Physical therapists and non-experienced users rated the device highly on a 5-point Likert scale (4.8 and 4.3, respectively).

## Abstract

Transferring a patient from one place to another is one of the most strenuous works in nursing care. To address this issue, we proposed a concept for a lifting assistance device that uses two cables to perform operations such as translation, rotation, and stay. It facilitates direct touch between the caregiver and the care receiver, allowing intuitive adjustments of position and posture based on the caregiver’s intention, detected through variations in cable tension.

To investigate the effectiveness of this concept, lifting experiments using a fabricated prototype were conducted. Twelve subjects, including four physical therapists (PTs) and eight subjects having no transfer experience, acted as caregivers, and a dummy was used as the care receiver.

Results show that regardless of the transfer experience, the caregiver’s intention detection and adjustment of the care receiver’s position and posture were successfully achieved with an accuracy of over 70%.

Survey feedback collected after the lifting experiments confirmed that utilizing direct touch between the caregiver and the care receiver was highly valued by all subjects, with a 5-point Likert scale rating both PTs (average score: 4.8 points) and non-experienced subjects (average score: 4.3 points).