Diverter Valve Purging Negative Pressure Wound Therapy
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Solution Overview
Problem
Existing negative pressure wound therapy (NPWT) systems face issues with blockages due to viscous fluids and solid matter, inaccurate wound pressure sensing due to fluid accumulation, and overfilling during instillation, leading to therapy interruptions and compromised accuracy.
Innovation Solution
A system and method utilizing a diverter valve to control fluid flow, allowing purging by directing flow to atmosphere or wound therapy dressing, with pressure sensors to detect blockages and manipulate the valve to clear obstructions without applying high pressure to the wound site, using a negative pressure source and reservoir to collect obstructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diverter valve is used to direct fluid flow to atmosphere for purging, then blockages in fluid lines are cleared, but fluid may accidentally enter pressure sensing lines during instillation
Solution Approach 1:
The system divides the fluid management into separate pathways: a therapy line for instillation fluid delivery and a pressure sensing line for monitoring. The diverter valve selectively directs flow to different destinations (atmosphere or wound dressing) to clear blockages in the therapy line without affecting the pressure sensing line, thereby maintaining measurement precision while improving reliability.
Solution Approach 2:
The diverter valve acts as an intermediary component that controls fluid flow direction. It mediates between the instillation pump, the wound dressing, and the atmosphere, allowing selective purging of the therapy line while isolating the pressure sensing line from potential fluid contamination, thus resolving the contradiction between clearing blockages and maintaining accurate pressure sensing.
2Reliability
If negative pressure is applied continuously to clear blockages, then fluid lines are purged effectively, but high pressure may be applied to the wound site causing tissue damage
Solution Approach 1:
The system extracts the purging function from the main therapy pathway by introducing a separate diverter valve that directs fluid flow to atmosphere. This allows blockages to be cleared by directing flow away from the wound site through the diverter valve, effectively removing the harmful high-pressure effect on tissue while maintaining the blockage clearance function.
Solution Approach 2:
Instead of applying negative pressure directly to the wound site to clear blockages (which could cause tissue damage), the system inverts the approach by using the diverter valve to create an alternative flow path that bypasses the wound site. The purging action is performed on the therapy line through atmospheric venting rather than direct wound site application, eliminating the harmful effect while achieving the desired blockage clearance.
3Quantity of substance
If instillation fluid is delivered in large volumes, then therapeutic effect is enhanced, but fluid accumulates in pressure sensing lines degrading measurement accuracy
Solution Approach 1:
The system segments the fluid pathways into a therapy line for large-volume instillation fluid delivery and a separate pressure sensing line for accurate monitoring. The diverter valve provides a purging pathway for the therapy line, allowing large volumes of instillation fluid to be delivered therapeutically while preventing accumulation in the pressure sensing line, thus maintaining measurement precision despite high quantity of substance in the therapy line.
Data Source
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AI summary
Systems and methods for purging a negative pressure wound therapy system.