Pressure-Sensor Patient Position Detection for Turn Assist Beds
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Solution Overview
Problem
Existing patient support apparatuses in hospital beds lack effective means to ensure proper patient positioning during turn assist and therapy functions, leading to compromised efficacy due to reliance on caregiver visual assessment, which can result in improper patient alignment.
Innovation Solution
Incorporation of a graphical user interface (GUI) and control circuitry that uses sensors to detect patient position, providing visual feedback through text, pictorial representations, and color-coded icons to indicate improper positioning, allowing caregivers to correct the patient's position before initiating or continuing turn assist and therapy functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual assessment by caregiver is used to determine patient positioning, then the system remains simple and easy to operate, but the accuracy and reliability of patient positioning deteriorates
Solution Approach 1:
The patent replaces the manual visual assessment mechanism with an automated sensor-based detection system. Pressure sensors embedded in the mattress surface automatically detect patient position and provide objective feedback, eliminating reliance on caregiver visual judgment and significantly improving positioning accuracy.
Solution Approach 2:
The system enables self-monitoring of patient positioning through automated sensors that continuously track patient location and provide real-time feedback. The mattress itself serves the dual function of supporting the patient and detecting their position, reducing the need for external monitoring equipment.
2Reliability
If no patient position feedback is provided, then the device complexity remains low, but the therapy function efficacy deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where pressure sensors detect patient position and provide real-time information to the control system. This feedback loop ensures that turn assist and therapy functions are only activated when the patient is properly positioned, guaranteeing therapy efficacy while maintaining straightforward control logic.
Solution Approach 2:
The system performs preliminary position verification before initiating turn assist or therapy functions. The sensors check patient positioning in advance, and the GUI provides advance notification to caregivers, ensuring proper positioning is established before therapy begins, thereby preventing wasted therapy cycles.
3Measurement precision
If real-time patient position detection is implemented, then the positioning accuracy improves, but the device complexity and cost increase
Solution Approach 1:
The pressure sensor array serves multiple functions: it detects patient position for turn assist guidance, monitors positioning during therapy, and can potentially track patient movement patterns. This multi-functionality justifies the added complexity by providing comprehensive monitoring capabilities from a single sensor system.
Solution Approach 2:
The patent uses a uniform array of identical pressure sensors distributed across the mattress surface. This homogeneous approach simplifies the sensor system design and manufacturing, as all sensors are of the same type and can be produced using standardized processes, thereby reducing overall system complexity despite the increased number of sensors.
Data Source
AI summary
A patient support apparatus includes a patient support surface to support a patient. The patient support surface has at least one air bladder that is inflated and/or deflated to achieve a turn assist function and/or a therapy function of the patient support surface. A graphical user interface (GUI) is configured to receive user inputs from a caregiver to initiate the turn assist or therapy functions. The patient support apparatus has control circuitry coupled to the GUI. The GUI is controlled by the control circuitry to display information indicating that the patient is improperly positioned on the patient support surface for either the turn assist function or the therapy function. Alternatively or additionally, the control circuitry indicates that the patient is improperly positioned for raising a head section of a bed frame.