Negative Pressure Control for Leak-Resilient Wound Therapy
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Solution Overview
Problem
Existing portable negative pressure wound therapy (TNP) devices are bulky, require skilled assistance, have limited battery life, generate unnecessary alarms due to leaks, and cause patient distress from pump fluctuations.
Innovation Solution
A pressure control apparatus with a controller that manages negative pressure application by deactivating the source if desired pressure is not achieved within a predetermined time, monitors for leaks, and adjusts pressure levels to avoid alarms and extend battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a portable TNP therapy unit is used, then mobility and patient independence are improved, but the device becomes relatively bulky and may require monitoring by a trained caregiver
Solution Approach 1:
The device is divided into separate functional modules: a controller unit, a power source (battery pack), and a TNP application module. This segmentation allows each component to be optimized independently and facilitates portable deployment while maintaining full functionality.
Solution Approach 2:
The controller automatically monitors pressure levels, detects leaks, and manages power consumption without requiring constant caregiver intervention. The system self-regulates therapy delivery and can independently respond to abnormal conditions, enabling patient independence.
2Reliability
If the source of negative pressure operates continuously, then desired negative pressure is maintained at the wound site, but battery power is depleted faster
Solution Approach 1:
The controller implements periodic pressure delivery cycles with adjustable duty cycles, alternating between active pressure application and rest periods. This maintains therapeutic effectiveness while significantly reducing average power consumption to extend battery life.
Solution Approach 2:
The system dynamically adjusts pressure delivery based on real-time wound site conditions, patient needs, and remaining battery power. The controller can modify pressure magnitude, duration, and timing to optimize both therapeutic outcome and energy efficiency.
3Stability of the object's composition
If the source of negative pressure is activated frequently to compensate for leaks, then pressure stability is improved, but the number of alarms increases and battery life decreases
Solution Approach 1:
The controller incorporates a leak compensation algorithm that anticipates and pre-corrects for expected pressure drops due to leaks. By proactively adjusting pressure delivery before alarms are triggered, the system maintains stability and prevents unnecessary alarm conditions.
Solution Approach 2:
The system continuously monitors pressure at the wound site and uses this feedback to automatically adjust pump activation timing and duration. This closed-loop control optimizes pressure maintenance while minimizing the number of pump cycles and associated alarms.
4Speed
If the pump motor is repeatedly started and stopped, then pressure control responsiveness is improved, but patient distress increases due to volume changes
Solution Approach 1:
The controller uses extended periodic cycles with longer on-periods and off-periods to reduce the frequency of motor start-stop events. This smoother operation minimizes volume fluctuations and associated patient discomfort while maintaining adequate pressure control.
Solution Approach 2:
The system incorporates multiple control strategies that can be selected based on patient condition and therapy stage: aggressive pressure control for rapid stabilization, and gentle gradual control for patient comfort during extended therapy. This multi-mode operation balances responsiveness with patient distress minimization.
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
Reduces alarms due to transient leaks, extends battery life, and maintains consistent negative pressure application, minimizing patient distress and contamination risks.
Implementation Method 1
a source of negative pressure; attempting to generate a desired negative pressure at the wound site
Data Source
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AI summary
A method and apparatus are disclosed for applying negative pressure to a wound site. The apparatus comprises a source of negative pressure, a processing element, and a memory comprising instructions configured to, when executed on the processor, cause the apparatus to perform the steps of, via the source of negative pressure, attempting to generate a desired negative pressure at the wound site, if the desired negative pressure has not been generated after a first predetermined period of time, deactivating the source of negative pressure for a second predetermined period of time, and subsequently attempting to generate the desired negative pressure at the wound site.