NPWT Gas Concentration Sensing for Blockage and Leak Detection
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Solution Overview
Problem
Existing NPWT systems face challenges in detecting blockages and leaks, which can disrupt the effectiveness of negative pressure treatment and compromise patient safety and comfort.
Innovation Solution
Incorporation of a gas concentration sensor and control circuitry to detect blockages and leaks by monitoring gas concentration levels within the fluid flow path, enabling the apparatus to output signals indicative of blockages or leaks based on detected gas concentrations over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a portable NPWT device with a smaller pump is used, then the device portability is improved, but the capacity to handle large amounts of wound exudate deteriorates
Solution Approach 1:
The system segments the exudate collection function into two parts: the absorbent dressing collects exudate at the wound site, and the canister collects exudate remotely. This allows the pump to operate at lower capacity while still effectively managing large amounts of exudate through the distributed collection approach.
2Reliability
If pressure monitoring is enhanced to detect blockages and leaks, then the treatment reliability is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a canister as an intermediary component between the wound site and the pump. The canister serves multiple functions: collecting exudate, providing a reference point for pressure monitoring, and enabling indirect detection of blockages and leaks through pressure differential measurements, thereby improving reliability without requiring direct sensing at the wound site.
Solution Approach 2:
The system implements feedback monitoring by continuously measuring pressure at the canister and comparing it against expected pressure differentials. When deviations occur indicating potential blockages or leaks, the system can alert the user or adjust operation, providing reliable monitoring through a relatively simple feedback mechanism.
3Quantity of substance
If the canister serves as the predominant means for collection of wound exudate, then the exudate collection capacity is improved, but the risk of blockages and leaks in the fluid flow path increases
Solution Approach 1:
The canister acts as an intermediary collection point that buffers the fluid flow path. By collecting exudate in the canister rather than requiring direct continuous flow to the pump, the system reduces the risk of blockages in the tubing and provides a safety margin against flow interruptions.
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
Enhances the robustness and safety of NPWT systems by independently detecting blockages and leaks, improving patient comfort and safety through automatic monitoring and adaptive pressure regulation.
Implementation Method 1
a gas concentration sensor configured to detect concentration levels of one or more gases within the fluid flow path or at the wound site
Implementation Method 2
Negative pressure wound therapy (NPWT) is a technique that promotes healing of e.g. surgical, acute and chronic wounds by the application of a sub-atmospheric pressure ('negative pressure') to the wound site, using a negative pressure pump. Excess wound exudate is thereby drawn out
Data Source
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AI summary
An apparatus for providing negative pressure to a wound site and related aspects are disclosed. The apparatus comprises a source of negative pressure configured to provide negative pressure via a fluid flow path from an inlet of the source of negative pressure to a wound site, a gas concentration sensor configured to detect concentration levels of one or more gases within the fluid flow path or at the wound site, and control circuitry operatively connected to the source of negative pressure and the gas concentration sensor. The control circuitry is configured to output a blockage signal indicative of a blockage being present within the fluid flow path based on a detected concentration level of one or more gases within the fluid flow path over time, and/or output a leakage signal indicative of a leakage being present within the fluid flow path based on a detected concentration level of one or more gases within the fluid flow path over time.