Roller Table Slip Simulation for Fall Prevention
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Solution Overview
Problem
Current fall prevention technologies are ineffective in simulating natural slips and are often large or impractical for clinical use, failing to adequately address the increased risk of falls among the elderly, which leads to significant morbidity and mortality.
Innovation Solution
A physical therapy apparatus featuring a roller table with free motion rollers and powered rollers, a lifting mechanism, and a programmable logic controller to simulate slips and trips in a controlled environment, while monitoring patient responses through a load cell and safety cord system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional training methods such as walking on foam mats or motorized treadmill perturbations are used, then strength and proprioception are improved, but reflex development has negligible impact
Solution Approach 1:
The apparatus intentionally creates controlled slip and trip conditions that simulate harmful fall scenarios, converting potentially dangerous situations into beneficial training opportunities. The slip simulation mechanism deliberately reduces friction under the user's feet to trigger natural reflex responses, while the trip mechanism creates controlled stumbling conditions. This approach transforms harmful slip/trip events into therapeutic tools for developing protective reflexes.
Solution Approach 2:
The system dynamically transitions between different training modes (normal walking, slip simulation, trip simulation) and adjusts the intensity of perturbations in real-time. The friction control mechanism dynamically modifies the coefficient of friction between the roller surface and user's footwear, while the trip mechanism dynamically adjusts the magnitude and direction of perturbations based on user response, creating adaptive reflex training.
2Device complexity
If existing fall prevention products are designed to address single modes of cause, then device complexity is reduced, but effectiveness in significantly reducing public fall risk is limited
Solution Approach 1:
The apparatus integrates multiple training functions into a single device: it can simulate slips by controlling friction, simulate trips by creating perturbations, provide strength training through resistance, and offer proprioception training through various surface conditions. This multi-functional design allows comprehensive fall prevention training addressing multiple causes and types of falls simultaneously, rather than requiring separate devices for each training mode.
3Reliability
If a physical therapy apparatus is designed to simulate natural slips in a controlled environment, then reflex training effectiveness is improved, but device complexity and clinical practicality may be compromised
Solution Approach 1:
The system uses an intermediary friction control mechanism between the user's feet and the support surface. By controlling the friction coefficient of the roller surface, the system can simulate slip conditions without requiring the user to be on a truly slippery surface. This intermediary friction control provides a safe, controllable way to induce slip reflexes while maintaining clinical safety standards.
Solution Approach 2:
The apparatus leverages the user's own body weight and natural reflexes as the training mechanism. The user's weight provides the force for the trip simulation, and their natural neuromuscular responses provide the training stimulus. This self-service approach eliminates the need for complex external actuation systems while maintaining training effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus effectively reconditions reflexes and mobility by simulating natural slips and trips, reducing the likelihood of falls and improving stability, thereby lowering healthcare costs and enhancing quality of life for elderly users.
Implementation Method 1
a load cell in communication with the apparatus, the load cell being configured to sense and record a patient's response to the transition of the roller table from the first position to the second position
Implementation Method 2
the plurality of free motion rollers being aligned in two parallel columns along a single plane... the plurality of powered rollers being positioned beneath and in contact with the plurality of free motion rollers
Data Source
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AI summary
An apparatus and method for physical therapy is disclosed. The apparatus includes a base structure, a roller table positioned on the base structure including an outer frame and a plurality of free motion rollers, at least one motor connected to the base structure, a plurality of powered rollers located within the base structure being in contact with the plurality of free motion rollers and connected to the at least one motor, a lifting mechanism located within the base structure and connected to the at least one motor and being configured to raise and lower the roller table to transition the apparatus between a first mode and a second mode, a load cell in communication with the apparatus being configured to measure and record a patient's response to the transition of the roller table from the first mode to the second mode, and a programmable logic controller in communication with the at least one motor and the load cell being configured to control the transition of the apparatus between the first mode and the second mode.