Negative Pressure Wound Pump Control for Dressing Full Detection
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Solution Overview
Problem
Existing wound treatment technologies face challenges in efficiently providing controlled negative pressure therapy to wounds, particularly in managing fluid exudates and promoting healing while minimizing disturbance to the wound site.
Innovation Solution
A pump system with a conductive coil, magnet, and diaphragm configuration, along with a dampener and valves, is used to provide controlled negative pressure, incorporating sensors and controllers for precise pressure management and fluid flow control, and a wound dressing that forms a fluid-tight seal with the pump system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If topical negative pressure therapy is applied to reduce tissue edema and promote wound healing, then wound healing rate is improved, but device complexity increases due to need for pump system, controller, and sensors
Solution Approach 1:
The patent combines the pump system, controller, and sensor array into an integrated wound treatment apparatus. The pump assembly is directly coupled with the wound dressing, and the controller is integrated into the pump housing, creating a unified system that delivers TNP therapy while monitoring wound conditions, thereby managing complexity through intentional integration rather than separate components
Solution Approach 2:
The wound dressing serves multiple functions: it acts as a barrier layer, contains the sensor array, provides fluid communication pathways, and interfaces with the pump system. This multi-functionality reduces the need for separate dedicated components for each function, addressing the complexity issue while maintaining therapeutic effectiveness
2Productivity
If controlled negative pressure is applied to promote blood flow and reduce edema, then wound healing is enhanced, but energy consumption increases due to continuous pump operation
Solution Approach 1:
The pump system operates by applying negative pressure in controlled cycles rather than continuous operation. The controller regulates the pump to create periodic suction phases followed by release phases, which maintains therapeutic effectiveness for promoting blood flow and reducing edema while allowing energy recovery during non-pumping phases, thereby reducing overall energy consumption
Solution Approach 2:
The system dynamically adjusts negative pressure parameters (magnitude and duration) based on wound healing stage and patient response. The controller modulates pump operation to deliver optimal pressure levels rather than constant maximum pressure, improving therapeutic outcomes while reducing unnecessary energy expenditure during later healing stages when lower pressures suffice
3Measurement precision
If sensor array is integrated into wound dressing to monitor wound conditions, then measurement precision is improved, but manufacturing complexity increases
Solution Approach 1:
The sensor array is divided into multiple discrete sensing elements distributed across the wound dressing surface. Each sensor monitors specific local wound conditions, and the controller processes individual sensor signals to create a comprehensive wound assessment. This segmentation allows for modular manufacturing of sensor modules that can be assembled into the dressing, reducing overall manufacturing complexity while maintaining high measurement precision through distributed sensing
4Productivity
If pump system operates at higher negative pressure to effectively manage hard-to-heal wounds, then therapeutic effectiveness is improved, but risk of tissue damage increases
Solution Approach 1:
The sensor array continuously monitors wound conditions including tissue response, exudate levels, and pressure distribution. This feedback is processed by the controller, which automatically adjusts pump operation to maintain optimal negative pressure levels. When sensors detect signs of tissue stress or damage risk, the controller reduces pressure magnitude or extends release phases, thereby maintaining therapeutic effectiveness for hard-to-heal wounds while preventing tissue damage through real-time feedback control
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 system effectively manages negative pressure therapy, reducing tissue edema, promoting blood flow, and minimizing bacterial load, while allowing for rapid wound healing with minimal disturbance.
Implementation Method 1
The coil can be directly or indirectly coupled with the diaphragm and can be configured to move at least a portion of the diaphragm to pump a fluid through the pump assembly in response to a drive signal applied to the coil
Implementation Method 2
A pump system with a diaphragm and voice coil actuator, integrated with a wound dressing, that applies controlled negative pressure through a fluid flow pathway
Data Source
AI summary
Systems and methods for controlling a pump system for use in negative pressure wound therapy are described herein. In some embodiments, a method for controlling a pump system includes causing provision of negative pressure, via a flow path, to a wound dressing configured to be positioned over a wound, the flow path configured to fluidically connect the pump system to the wound dressing, measuring a first pressure value in the flow path at a first time, measuring a second pressure value in the flow path at a second time, calculating a first rate of pressure change using the first and second pressure values, and in response to determining that the calculated first rate of pressure change satisfies a threshold rate of change, providing an indication that the wound dressing is full, wherein the method is performed under control of a controller of the pump system.