Closed-Loop Instillation Volume Control for Negative-Pressure Wounds
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Solution Overview
Problem
Existing wound therapy systems face challenges in determining appropriate instillation volumes for negative-pressure wound therapy, leading to issues such as overfill or underfill of the tissue site, which can cause dressing failure or reduced therapy effectiveness.
Innovation Solution
A system and method for determining an optimal instillation volume using a controller communicatively coupled to an instillation source and negative-pressure source, with sensors to measure fluid delivery and recovery, allowing for real-time adjustment to achieve equilibrium and saturation of the tissue site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual estimation of tissue site volume is used, then device complexity is reduced, but manufacturing precision (instillation volume accuracy) deteriorates
Solution Approach 1:
The system performs self-measurement of tissue site volume through automated sensor detection during negative-pressure therapy, eliminating the need for manual clinician estimation. The sensors automatically detect fluid dynamics parameters that indicate saturation, allowing the system to determine optimal instillation volume without external intervention.
Solution Approach 2:
The patent replaces manual mechanical measurement methods with automated electronic sensors and digital processing systems. Sensors detect fluid dynamics parameters (flow rate, pressure changes) and the controller processes this data to calculate tissue site volume, substituting human estimation with automated electronic measurement.
2Manufacturing precision
If automated sensor-based volume determination is implemented, then instillation volume accuracy is improved, but device complexity increases
Solution Approach 1:
The sensors and controller serve multiple functions: they monitor fluid dynamics during negative-pressure therapy, detect saturation conditions, determine tissue site volume, and control instillation parameters. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in system complexity.
Solution Approach 2:
The system uses real-time feedback from sensors monitoring fluid dynamics to automatically adjust instillation parameters. The controller continuously receives data from sensors, compares it against saturation thresholds, and modifies instillation volume accordingly, creating a closed-loop control system that improves accuracy while maintaining manageable complexity through intelligent automation.
3Reliability
If real-time instillation volume monitoring is implemented, then therapy effectiveness is improved, but loss of time (measurement time) increases
Solution Approach 1:
The system performs preliminary measurement of tissue site volume during the initial phase of negative-pressure therapy before beginning the instillation process. By characterizing the tissue site's fluid dynamics and saturation points in advance, the system establishes baseline data that enables rapid, real-time monitoring throughout the actual therapy duration.
Solution Approach 2:
The sensors continuously monitor fluid dynamics parameters throughout the entire therapy process without interruption, providing ongoing data for volume determination and saturation detection. This continuous monitoring ensures that the system can immediately detect when saturation occurs and adjust instillation parameters in real-time, maintaining therapy effectiveness while minimizing measurement time through uninterrupted data collection.
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
The system optimizes instillation volume determination, reducing clinician time demands and improving therapy effectiveness by minimizing overfill or underfill, thereby enhancing patient outcomes and wider adoption of negative-pressure wound therapy.
Implementation Method 1
a negative-pressure source configured to draw fluid from the tissue site to develop a negative pressure at the tissue site
Data Source
AI summary
Systems and methods for treating a tissue site are described. The system includes an instillation source configured to provide instillation solution to the tissue site, and a negative-pressure source configured to draw fluid from the tissue site to develop a negative pressure at the tissue site. The system also includes a controller communicatively coupled to the instillation source and the negative-pressure source. The controller is configured to actuate the instillation source and actuate the negative-pressure source. The system also includes a sensor communicatively coupled to the controller and operatively coupled to the instillation source and the negative-pressure source. The sensor is configured to generate a signal indicative of an amount of fluid delivered to the tissue site and an amount of fluid recovered from the tissue site.