Pneumatic Mattress Control for Bed Section Retraction Sensing
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Solution Overview
Problem
Hospital bed frames with extendable and retractable sections often require mattresses to be controlled by the bed frame's integrated system, leading to issues like mattress overrun or billowing when used with incompatible mattresses or replacement surfaces.
Innovation Solution
A mattress with its own pneumatic control system and sensors, such as string potentiometers or Hall Effect sensors, that adjust bladder inflation in response to bed frame movements, ensuring consistent interface pressures and preventing overrun.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mattress replacement system is used on a hospital bed frame with extendable and retractable sections, then the mattress can be upgraded with new functionality, but the mattress may overrun the edges or billow when the bed section retracts
Solution Approach 1:
The patent implements a feedback control system where sensors detect the position of the bed frame sections and communicate this information to a controller. The controller then adjusts the inflation of bladder sections in real-time based on the detected bed section position, preventing overrun and billowing while maintaining proper mattress support.
Solution Approach 2:
The patent makes the mattress dynamically adaptive by using adjustable bladder inflation levels that change in response to bed frame movements. Instead of a static mattress structure, the system continuously adjusts internal pressure to maintain proper fit and support as the bed sections extend or retract.
2Reliability
If the mattress bladder inflation is adjusted dynamically in response to bed frame movements, then consistent interface pressures are maintained, but the system complexity increases
Solution Approach 1:
The patent divides the mattress into multiple independent bladder sections that can be controlled separately. Each bladder section can be adjusted individually based on the position of corresponding bed frame sections, allowing for localized pressure management without requiring complex global control.
Solution Approach 2:
The patent introduces a controller as an intermediary component that receives signals from sensors about bed section positions and translates them into appropriate inflation adjustments for the bladder sections. This intermediary simplifies the control logic by centralizing the decision-making process.
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 mattress maintains consistent interface pressures and prevents overrun by independently controlling bladder inflation based on bed frame movements, accommodating various bed frame configurations.
Implementation Method 1
The sensor may output a signal indicative that a force is being applied to the mattress in response to at least one mattress support section being extended or retracted
Implementation Method 2
a pneumatic controller configured to inflate and deflate the at least one inflatable bladder
Data Source
AI summary
A patient support surface, such as a mattress, includes one or more sensors to sense movement of at least a portion of the mattress caused by extension or retraction of an associated mattress support section of a bed frame. A pneumatic control system adjusts inflation and/or deflation of at least one inflatable bladder of the mattress in response to a signal received from the one or more sensors.