Wound Therapy Pressure Self-Testing for Leak and Flow Faults
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Solution Overview
Problem
Existing negative pressure wound therapy devices lack effective self-testing mechanisms to ensure proper functioning and safety, which can lead to inefficiencies and potential harm due to leaks, insufficient flow, or unsafe pressure levels.
Innovation Solution
Incorporation of a control circuitry system with valves, pressure sensors, and flow restrictors to perform self-testing modes, including leak, flow, and excessive pressure tests, ensuring device integrity and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-testing mechanisms are added to negative pressure wound therapy devices, then device safety and reliability are improved, but device complexity increases
Solution Approach 1:
The control circuitry performs self-tests before initiating negative pressure wound therapy to detect potential safety issues in advance. The system checks for leaks, verifies flow restrictor functionality, and confirms pressure sensor accuracy before therapy begins, preventing unsafe operation without requiring continuous complex monitoring during therapy.
Solution Approach 2:
The device performs self-diagnosis and self-testing using its own control circuitry, pressure sensors, and flow restrictors without requiring external testing equipment. The system automatically detects faults and alerts users, reducing the need for external verification and simplifying the overall testing infrastructure.
2Measurement precision
If multiple test modes (leak test, flow test, excessive pressure test) are implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The control circuitry serves multiple functions by implementing three distinct test modes (leak detection, flow verification, excessive pressure detection) within a single integrated system. The same control circuitry, pressure sensors, and flow restrictors are used across all test modes, allowing comprehensive safety verification without proportionally increasing hardware complexity.
Solution Approach 2:
The system uses a single pressure sensor to detect different safety conditions by monitoring pressure parameter changes under different test conditions. By varying the test parameters (closing valve during leak test, opening valve during flow test, monitoring at different pressure thresholds), the system achieves multiple measurement objectives with one sensor, reducing the need for multiple specialized sensors.
3Reliability
If the device performs self-testing before therapy, then reliability is improved, but loss of time occurs during testing
Solution Approach 1:
The control circuitry performs targeted partial tests focusing on critical safety parameters (leak detection, flow verification, pressure thresholds) rather than comprehensive exhaustive testing. This selective approach verifies essential safety functions quickly without requiring extended testing periods, balancing thoroughness with time efficiency.
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
Ensures reliable operation by detecting and addressing leaks, insufficient flow, and unsafe pressure, enhancing the safety and effectiveness of negative pressure wound therapy.
Implementation Method 1
a pressure sensor configured to measure pressure in the fluid flow path and a pressure differential across the flow restrictor
Implementation Method 2
a negative pressure source configured to be connected, via a fluid flow path, to a wound covered by a wound dressing and provide negative pressure to a wound
Implementation Method 3
a valve positioned in the fluid flow path. The valve can be configured to, in an open state, permit supply of negative pressure from the negative pressure source upstream of the valve. The valve can be configured to, in a closed state, block supply of negative pressure from the negative pressure source upstream of the valve
Implementation Method 4
a flow restrictor positioned in the fluid flow path, which can be positioned downstream of the valve
Data Source
AI summary
A negative pressure wound therapy device can include a negative pressure source configured to be connected, via a fluid flow path, to a wound, a valve positioned in the fluid flow path and configured to, in an open state, permit supply of negative pressure from the negative pressure source upstream of the valve and, in a closed state, block supply of negative pressure from the negative pressure source upstream of the valve, a flow restrictor positioned in the fluid flow path, and a pressure sensor configured to measure a pressure differential across the flow restrictor. The device can include control circuitry configured to, in a normal operational mode, cause the valve to be in the open state and, in a test mode, perform at least one of a leak test, a flow test, or an excessive pressure test.