Wound Dressing Fluid Delivery via Pressure Feedback Control
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Solution Overview
Problem
Existing fluid delivery systems for wound therapy dressings lack automation in determining the appropriate volume of fluid to be delivered, leading to potential under- or over-delivery, especially since wounds are non-uniform and change volume during therapy, and current methods rely on user judgment or visual observation, which can be time-consuming and prone to errors.
Innovation Solution
A system comprising a wound dressing, a negative pressure source, a fluid flow device, a pressure sensor, a control device, a reservoir, and a check valve that uses pressure sensors to control fluid flow, ensuring the wound dressing receives the correct volume of fluid by restricting flow when a predetermined pressure is reached, thus preventing overfilling and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automated fluid delivery systems are implemented, then fluid delivery precision is improved, but device complexity increases
Solution Approach 1:
The system employs a pressure sensor that continuously monitors fluid pressure within the wound dressing and feeds this information back to the controller. When the predetermined pressure threshold is reached, the controller automatically stops fluid delivery, ensuring precise fluid volume control without requiring complex volume measurement mechanisms.
Solution Approach 2:
The patent replaces complex mechanical volume measurement and control systems with a simpler pressure-based control mechanism. Instead of using sophisticated flow meters and volume tracking systems, the invention uses pressure sensing to indirectly control fluid delivery, substituting mechanical complexity with a more straightforward pressure-regulation approach.
2Device complexity
If user judgment and visual observation are used to determine fluid volume, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The system performs self-monitoring and self-control of fluid delivery. The pressure sensor automatically detects when the wound dressing has received sufficient fluid, and the controller autonomously stops delivery, eliminating the need for user judgment while maintaining system simplicity through automated feedback control.
3Device complexity
If gravity feed systems are used, then device complexity is reduced, but control precision over fluid delivery deteriorates
Solution Approach 1:
The pressure sensor acts as an intermediary between the gravity feed system and the control mechanism. It translates the physical state of fluid pressure within the dressing into control signals that regulate the flow regulator, bridging the simple gravity feed mechanism with precise automated control without requiring complex pumping systems.
4Ease of operation
If active pumping systems are used, then fluid delivery control is improved, but loss of substance increases due to over-delivery
Solution Approach 1:
The pressure sensor provides real-time feedback on the fluid pressure state within the wound dressing, enabling the controller to stop fluid delivery at the optimal moment. This prevents both under-delivery and over-delivery, eliminating fluid waste while maintaining ease of operation through automated 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 ensures accurate and efficient fluid delivery to wound dressings by automatically controlling fluid flow based on pressure readings, reducing waste and leakage, and accommodating changes in wound volume over time.
Implementation Method 1
a pressure sensor coupled to the wound dressing and to the control device, wherein the pressure sensor is configured to send a control signal to the control device and control fluid flow from the fluid flow device when the pressure sensor detects a predetermined pressure at the wound dressing
Implementation Method 2
a check valve between the wound dressing and the reservoir, wherein the check valve is configured to restrict fluid flow to the reservoir when the reservoir is not at a negative pressure
Implementation Method 3
a negative pressure source coupled to the wound dressing
Implementation Method 4
a vent coupled to the reservoir and configured to selectively open the reservoir to atmosphere
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Systems and methods for delivery of fluid to a wound therapy dressing. In exemplary embodiments, a pressure sensor measures the pressure at the wound therapy dressing and restricts fluid flow to the wound therapy dressing when a predetermined pressure is achieved.