Inflatable mattress and control methods
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Solution Overview
Problem
In healthcare settings, manually determining the optimal inflation level for inflatable mattresses to distribute patient weight evenly and prevent bed sores while ensuring comfort is challenging for caregivers.
Innovation Solution
The implementation of a system with inflatable bladders, depth sensors, air pressure sensors, and a controller that automatically determines suitable inflation levels by monitoring the rate of change of depth signals relative to air pressure signals, allowing for individualized and adaptive pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the inflation level of the bladders is increased to distribute patient weight over a greater area, then the interface pressure between the patient and the mattress is reduced, but the patient may sink too deeply into the mattress causing discomfort
Solution Approach 1:
The mattress uses dynamically adjustable inflatable bladders that can change their inflation levels in real-time based on patient position and pressure distribution requirements, allowing the system to adapt between supporting weight distribution and preventing excessive sinking
Solution Approach 2:
The system changes the physical parameter of bladder inflation pressure to optimize the balance between weight distribution and patient comfort, using controlled pressure adjustments to achieve optimal support without excessive sinking
2Reliability
If the inflation level is manually adjusted by caregivers to achieve proper weight distribution, then bed sore prevention is improved, but the complexity of operation increases and requires manual intervention
Solution Approach 1:
The mattress system performs self-adjustment of inflation levels using embedded sensors and automated control algorithms that monitor patient pressure distribution and automatically modify bladder pressure to prevent bed sores without requiring caregiver intervention
Solution Approach 2:
The system incorporates pressure sensors that continuously monitor patient-mattress interface pressure and provide feedback to the control system, which then adjusts bladder inflation levels accordingly to maintain optimal pressure distribution for bed sore prevention
3Device complexity
If a single inflation level is used for the entire mattress, then the device complexity is reduced, but the ability to provide individualized pressure distribution for different patient body regions is compromised
Solution Approach 1:
The mattress is divided into multiple independent inflatable bladder zones that can be controlled separately, allowing different pressure levels in different body regions (head, torso, legs) to accommodate individual patient anatomical and comfort requirements
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
This system effectively reduces interface pressure, minimizing the risk of bed sores and ensuring patient comfort without manual intervention, by automatically adjusting inflation levels based on patient position and movement.
Implementation Method 1
a depth sensor that generates a depth signal indicative of how deeply a patient positioned on the patient support sinks into the inflatable bladder
Implementation Method 2
an air pressure sensor that generates an air pressure signal indicative of a level of air pressure inside the inflatable bladder
Data Source
AI summary
A patient support, such as a mattress, includes a plurality of inflatable bladders. Depth sensors are included in the support that measure the degree of penetration of a patient into the mattress. An air pressure sensor is also included that measures the pressure inside at least one bladder. A suitable inflation level of the mattress is determined by monitoring the rate of change of the depth with respect to air pressure as the bladder is either inflated or deflated. By detecting an inflection point in the graphical relationship of the depth and pressure outputs, a suitable inflation point for the bladders is determined that reduces interface pressures experienced by the patient, yet does not overly sink the patient into the mattress to a degree of discomfort. Analyzing the outputs of the depth and pressure sensors can also be used to detect a patient's heart rate and respiration rate.