Wound Volume Measurement Using Pneumatic Vacuum and Flow Sensing
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Solution Overview
Problem
Current methods for measuring wound volume during topical negative pressure (TNP) therapy are inaccurate, time-consuming, and impractical for continuous monitoring, especially outside a hospital setting, as they rely on dimensions, fillers, or photographic methods that do not provide reliable volume assessments.
Innovation Solution
A method and apparatus that apply a dressing with a sealing drape over the wound, create a vacuum using a pump, measure the volume of air extracted, and calculate the wound volume using a flow sensor, allowing for precise and portable wound volume measurement at dressing changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods (dimensions, fillers, photography) are used to measure wound volume, then measurement can be performed, but accuracy and reliability are poor
Solution Approach 1:
The patent replaces traditional mechanical measurement methods (rulers, fillers, photographs) with a pneumatic system that uses vacuum pressure and flow sensing to measure wound volume. The vacuum pump creates negative pressure to draw air through the wound cavity, and the flow sensor measures the air flow rate to calculate volume, providing accurate and reliable measurements without physical contact with the wound.
Solution Approach 2:
The invention uses pneumatic principles by applying vacuum pressure through a pump to create controlled air flow through the wound cavity. The system measures the flow rate of air under known pressure differential to determine wound volume, leveraging gas flow characteristics for non-invasive, accurate measurement.
2Reliability
If complex hospital-based apparatus is used for TNP therapy and wound measurement, then therapeutic effects are achieved, but device portability and ease of use outside hospital are poor
Solution Approach 1:
The patent divides the wound measurement function from the main TNP therapy system, creating a separate, portable measurement apparatus that can be used independently at dressing changes. This segmentation allows the measurement device to be lightweight and easy to transport while the full TNP system remains in the hospital, enabling home care scenarios.
Solution Approach 2:
The measurement apparatus creates a simplified copy of the hospital-based measurement capability, using the same vacuum and flow sensing principles but in a compact, portable form factor. This allows accurate wound volume assessment outside the hospital without requiring the full complexity of hospital equipment.
3Productivity
If frequent wound volume measurements are performed to monitor healing progress, then continuous monitoring is achieved, but time consumption and practicality decrease
Solution Approach 1:
The automated pneumatic measurement system replaces time-consuming manual measurement procedures. The vacuum pump automatically draws air through the wound and the flow sensor continuously measures air flow, allowing rapid volume assessment without manual intervention, making frequent measurements practical and efficient.
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
Enables accurate and continuous monitoring of wound volume progression, facilitating effective TNP therapy management in various environments with a lightweight, user-friendly device capable of maintaining negative pressures up to -200 mmHg, reducing patient discomfort and improving wound healing assessment.
Implementation Method 1
creating a vacuum in the wound cavity by vacuum pump means so as to produce a predetermined vacuum in the wound cavity
Implementation Method 2
measuring a volume of air extracted from the wound cavity in producing the predetermined vacuum
Implementation Method 3
measuring a volume of air extracted from the wound cavity in producing the predetermined vacuum
Data Source
AI summary
A method and apparatus for measuring a volume of a wound are described, the method comprising the steps of: applying a dressing over a wound, the volume of which is to be measured, the dressing including at least a sealing drape over the wound so as to create a sealed wound cavity; creating a vacuum in said wound cavity by vacuum pump means so as to produce a predetermined vacuum in the wound cavity; measuring a volume of air extracted from said wound cavity in producing said predetermined vacuum; and, calculating a volume of said wound.