Bed-leaving Sensor Using Foot Region Pressure Detection
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Solution Overview
Problem
Existing bed-leaving sensors in hospitals and nursing facilities detect bed-leaving after the user has completely left the bed, leading to delayed alerts and increased risk of accidents due to false alarms and early detection of sitting up as bed-leaving.
Innovation Solution
A bed-leaving sensor system that includes a pressure sensor to detect the sitting position and foot movement within a preset bed-leaving expectation region, allowing for accurate detection of bed-leaving behavior before the user completely leaves the bed, using a pressure sensor arranged only in the foot side region to minimize false alarms and ensure user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is arranged on the entire bed surface to detect sitting position, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The bed surface is divided into multiple detection zones (head region, body region, foot region) with pressure sensors strategically positioned only in critical areas. The sitting position detection focuses on the foot side region where pressure changes indicate bed-leaving intent, rather than monitoring the entire bed surface.
Solution Approach 2:
Pressure sensors are concentrated in the foot side region where they provide maximum diagnostic value for detecting bed-leaving behavior. This localized sensor placement optimizes detection accuracy while minimizing the number of sensors required, reducing device complexity and cost.
2Loss of time
If the pressure sensor detects any sitting position as bed-leaving, then detection timing is improved (earlier alert), but false alarm rate increases
Solution Approach 1:
The system detects sitting position in the foot side region as a preliminary indicator of bed-leaving intent, triggering an alert before the user actually leaves the bed. This preliminary detection provides early warning while the user is still on the bed, allowing intervention before accidents occur.
Solution Approach 2:
The system continuously monitors pressure sensor data to track changes in user position and behavior. By analyzing the sequence and pattern of pressure changes (sitting up, moving to foot region, feet touching ground), the system provides feedback to distinguish genuine bed-leaving events from temporary sitting positions, reducing false alarms.
3Measurement precision
If load sensors are provided at each leg part to detect center of gravity movement, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential detection function from complex multi-sensor systems. Instead of using load sensors at each leg part, a single pressure sensor on the foot side region suffices to detect the characteristic pressure changes that indicate bed-leaving intent, simplifying the device while maintaining accuracy.
Solution Approach 2:
The pressure sensor on the foot side region serves multiple detection functions: detecting sitting position, detecting feet touching ground, and inferring bed-leaving intent. This single sensor replaces what would otherwise require multiple specialized sensors, reducing device complexity.
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
Enables precise detection of bed-leaving behavior before the user leaves the bed, reducing the risk of accidents and false alarms, while maintaining user comfort and sensor compactness.
Implementation Method 1
a pressure sensor arranged on the bed
Data Source
AI summary
A bed-leaving sensor for detecting bed-leaving by a user on a bed, including: a sitting position detection member that detects a sitting position of the user based on a detection value of a pressure sensor arranged on the bed; a foot movement detection member for detecting foot movement of the user based on the detection value of the pressure sensor; and a bed-leaving behavior detection member that detects bed-leaving behavior of the user with the sitting position or the foot movement being detected within a preset bed-leaving expectation region as a condition.