Self-Activated Lifting Vest with Sensory Feedback
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Solution Overview
Problem
Existing lifting devices, such as back belts, are ineffective in preventing lifting-related back injuries as they do not significantly reduce biomechanical loading on the trunk during manual lifting, and there is a need for better lift-assistance devices to address the high incidence and economic impact of such injuries.
Innovation Solution
A self-activated lifting vest with sensory-feedback (LV(SF)) that includes a load transfer element, posture compliance element, and sensory feedback element to encourage appropriate posture during lifting by transferring weight from the shoulders to the lower torso and providing feedback to the user to maintain an erect posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If back belts are used to support the trunk during lifting, then some level of support is provided, but they do not significantly reduce biomechanical loading on the trunk and are ineffective in preventing lifting-related back injuries
Solution Approach 1:
The lifting vest is divided into multiple functional segments: load transfer elements (shoulder straps, waist belt), postural compliance elements (rigid back panel, flexible side panels), and sensory feedback elements (pressure-sensitive materials). This segmentation allows each component to perform its specific function optimally while working together to reduce spinal loading and prevent back injuries.
Solution Approach 2:
The vest introduces intermediary elements between the user's body and the external load. The load transfer elements act as intermediaries to distribute weight across the shoulders and waist rather than the spine. The postural compliance elements serve as intermediaries to enforce proper lifting posture through mechanical constraints and sensory feedback, thereby preventing injury.
2Object-affected harmful factors
If a lifting device provides mechanical support to reduce spinal loading, then back injury prevention is improved, but the device structure becomes more complex
Solution Approach 1:
The vest employs self-service mechanisms where the user's own movements and posture automatically engage the support system. As the user bends or adopts incorrect posture, the postural compliance elements passively restrict motion and provide sensory feedback through pressure-sensitive materials. This eliminates the need for active control systems, motors, or complex electronics while still achieving spinal loading reduction.
Solution Approach 2:
The vest changes physical parameters of the support system based on user posture. The postural compliance elements alter their mechanical constraints and the sensory feedback elements change their pressure sensitivity levels in response to the user's bending angle and posture. This dynamic parameter adjustment provides optimal spinal protection without requiring complex active control systems.
3Ease of operation
If sensory feedback is provided to encourage appropriate posture, then lifting technique improvement is enhanced, but the device complexity increases
Solution Approach 1:
The vest incorporates sensory feedback elements that provide immediate tactile feedback to the user when incorrect posture is adopted. Pressure-sensitive materials in the postural compliance elements detect improper bending or posture and provide localized pressure feedback to guide the user back to the correct lifting technique. This continuous feedback loop enhances posture compliance without requiring complex electronic or computational systems.
Data Source
AI summary
Medical lifting devices and methods are disclosed. A lifting support device includes a garment configured to be worn by a user and at least one sensory feedback element. The sensory feedback element is coupled to the garment and is configured to provide sensory feedback to the user. The sensory feedback encourages the user to adopt an appropriate posture during a lifting operation. A lifting vest includes a load transfer element, a posture compliance element, a coupling device, and at least one sensory feedback element. The load transfer element is configured to transfer a weight of a load to a point over shoulders of a user and down to a lower torso of the user. The posture compliance element is configured to passively or actively enforce an appropriate back posture. The coupling device is configured to connect the load-transfer element to the postural compliance element.