NPWT Controller Dynamic Fluid Volume Adjustment
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Solution Overview
Problem
Existing negative pressure wound therapy (NPWT) devices often overfill wounds with instillation fluid, leading to frequent leakages and reduced therapy quality due to inadequate accounting for changes in fluid capacity over time.
Innovation Solution
A NPWT system with a controller that adjusts the quantity of instillation fluid based on a reduction factor, determined by negative pressure and therapy duration, to ensure appropriate fluid levels and prevent overfilling, using a database of reduction factors and empirical relationships to calculate the reduced fluid volume for subsequent cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed quantity of instillation fluid is provided to the wound for each cycle, then the instillation system is simple to operate, but the wound becomes overfilled leading to frequent leakages
Solution Approach 1:
The system dynamically adjusts the instillation fluid quantity based on real-time monitoring of wound fluid capacity, negative pressure values, and therapy duration. The controller modifies the fluid delivery rate and total volume adaptively, transitioning from static fixed-volume delivery to dynamic responsive delivery that prevents overfilling and leakages while maintaining ease of operation through automated control.
Solution Approach 2:
The system implements feedback control by monitoring negative pressure values, fluid delivery rates, and therapy duration, then using this information to adjust subsequent instillation fluid quantities. The controller receives feedback from sensors and automatically modifies delivery parameters to maintain optimal wound fluid capacity, preventing both overfilling and under-treatment.
2Quantity of substance
If the instillation fluid quantity is increased to ensure adequate wound coverage, then wound coverage is improved, but leakages occur more frequently
Solution Approach 1:
The system changes the parameter of instillation fluid quantity from a fixed high value to a dynamically adjusted value based on monitored wound conditions. By continuously adapting the fluid delivery parameters (volume, rate, timing) to match actual wound fluid capacity, the system ensures adequate wound coverage while preventing the harmful effect of overfilling-induced leakages.
Solution Approach 2:
Instead of delivering a fixed excessive amount of fluid that causes overfilling, the system delivers precisely the partial amount needed based on real-time wound capacity assessment. The controller adjusts delivery to provide sufficient but not excessive fluid, eliminating the harmful leakage effect while maintaining therapeutic effectiveness.
3Object-affected harmful factors
If the instillation fluid quantity is decreased to prevent overfilling, then leakages are reduced, but wound coverage becomes insufficient
Solution Approach 1:
The system dynamically determines the optimal instillation fluid quantity by monitoring wound negative pressure, therapy duration, and fluid delivery characteristics. This dynamic adjustment ensures the wound receives sufficient fluid coverage for effective treatment while preventing overfilling, adapting the fluid quantity to match actual wound needs rather than using fixed reduced amounts.
Solution Approach 2:
The controller uses feedback from negative pressure monitoring and therapy duration tracking to adjust instillation fluid quantity. This feedback mechanism ensures that reduced fluid delivery does not compromise wound coverage, as the system compensates by optimizing delivery timing and rate based on real-time wound capacity assessment.
4Reliability
If a dynamic adjustment system is implemented to account for wound fluid capacity changes, then therapy reliability is improved, but device complexity increases
Solution Approach 1:
The controller performs multiple functions: it monitors negative pressure, tracks therapy duration, calculates optimal instillation fluid quantity, controls fluid delivery rate, and prevents leakages. By consolidating these diverse functions into a single multi-functional controller, the system improves reliability through dynamic adjustment while minimizing the increase in overall device complexity through functional integration.
Solution Approach 2:
The system provides self-service by automatically monitoring wound conditions and adjusting instillation fluid delivery without requiring manual intervention. The controller autonomously determines optimal fluid quantities based on monitored parameters, eliminating the need for complex external control systems or frequent manual adjustments, thereby improving reliability while keeping device complexity manageable.
Data Source
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AI summary
One implementation of the present disclosure is a negative pressure wound therapy (NPWT) system, according to some embodiments. In some embodiments, the system includes an instillation system configured to provide instillation fluid to a wound site, and a controller. In some embodiments, the wound site includes a wound and a wound dressing. In some embodiments, the controller is configured to provide a first quantity of instillation fluid for a first instillation cycle. In some embodiments, the controller is configured to determine a second quantity of instillation fluid for a second instillation cycle based on the first quantity and a reduction factor. In some embodiments, the second quantity of instillation fluid is less than the first quantity of instillation fluid. In some embodiments, the controller is configured to adjust an operation of the instillation system to provide the second quantity of instillation fluid to the wound site.