Patient Fall Detection Using 3D Position Tracking
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Solution Overview
Problem
Current patient monitoring systems in healthcare facilities face challenges in accurately detecting patient falls in bathrooms and tracking bathroom usage, as they often rely on accelerometers that increase costs and complexity, and may generate false positives, while also failing to account for unattended patient bathroom use which affects sanitation and caregiver response times.
Innovation Solution
A high-accuracy locating system using transceivers and patient ID tags that communicate via ultra-wideband signals or time difference of arrival techniques to determine patient location in 3D space without accelerometers, detecting falls based on elevation changes relative to a reference plane and initiating alerts for prolonged bathroom stays or excessive usage, thereby improving patient safety and sanitation monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If accelerometers are included in tracking tags to monitor patient movement, then patient fall detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the fall detection function from the patient-worn tag and relocates it to the facility infrastructure. The tag only needs to contain a simple transceiver, while the complex processing is performed by ceiling-mounted transceivers and a central server, thereby simplifying the tag design and reducing its complexity
Solution Approach 2:
The patent introduces ceiling-mounted transceivers as intermediaries between the patient tag and the fall detection function. These transceivers receive signals from the tag, calculate the patient's position and elevation, and send this information to the server, which performs the actual fall detection analysis
2Reliability
If accelerometers are used to detect patient falls, then fall detection is enabled, but false positive signals increase due to normal arm movements
Solution Approach 1:
The patent transitions from monitoring acceleration (1D temporal change) to monitoring 3D spatial position, particularly the vertical elevation dimension. By tracking the patient's position in three-dimensional space using ceiling-mounted transceivers, the system can distinguish between normal arm movements (which maintain relatively stable elevation) and actual falls (which cause significant elevation changes)
3Object-affected harmful factors
If bathroom door is kept closed to maintain privacy, then patient privacy is protected, but caregiver visibility and response time to falls are reduced
Solution Approach 1:
The patent replaces the mechanical visual monitoring system (caregivers needing to see into the bathroom) with an electronic sensing system. The transceivers and server continuously monitor the patient's position electronically, enabling fall detection without requiring the door to be open for visual inspection
4Device complexity
If traditional tracking systems are used without bathroom usage tracking, then system simplicity is maintained, but sanitation monitoring capability is lost
Solution Approach 1:
The patent makes the tracking system universal by enabling it to perform multiple functions: fall detection and bathroom usage monitoring. The same transceiver infrastructure and positioning algorithms are used for both purposes, so no additional hardware is needed - the system simply gains enhanced functionality
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 system provides accurate patient fall detection and bathroom usage tracking within one foot of the patient's location, reducing false alarms and enabling timely caregiver intervention and targeted housekeeping, enhancing both patient safety and facility sanitation.
Implementation Method 1
transceivers and patient ID tags that communicate via ultra-wideband signals or time difference of arrival techniques to determine patient location in 3D space
Implementation Method 2
transceivers and patient ID tags that communicate via ultra-wideband signals or time difference of arrival techniques to determine patient location in 3D space
Data Source
AI summary
A patient fall detection system includes a computer and multiple transceivers mounted at fixed locations in a healthcare facility. The transceivers are electronically coupled to the computer. A patient identification tag is worn by a patient and includes a tag transceiver. The high-accuracy locating system monitors a location of the patient ID tag via signals from the tag transceiver to determine whether a patient has entered a bathroom. The computer monitors at least one of an elevation of the patient ID tag in the bathroom, an elevation drop of the patient ID tag in the bathroom, or a time that the patient ID tag has been in the bathroom to determine whether the patient has fallen.