Wound Therapy Device Pressure Control
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Solution Overview
Problem
Current methods for dosing and determining the suitable volume of instill fluid in negative pressure wound therapy are inefficient, leading to potential under or over-pressure issues, which can impede wound healing and require subjective assessment, resulting in variable outcomes and increased costs due to premature dressing changes.
Innovation Solution
A wound therapy device equipped with a pressure sensor, drainage container, and control means that automatically regulates the negative pressure and fluid supply by emitting signals to switch off the pump when preset threshold values are reached, ensuring a precise volume of instill fluid is introduced into the wound space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the volume of instill fluid supplied is increased to improve wound rinsing effect, then the fluid flushing effect is enhanced, but over-pressure is generated in the wound space which can damage the wound and cause maceration
Solution Approach 1:
The patent employs pressure sensor means that continuously monitor the negative pressure in the wound space and provide feedback signals to the control means. When the pressure reaches a predetermined threshold indicating sufficient fluid instillation, the control means automatically interrupts further fluid supply, preventing over-pressure damage while ensuring adequate wound rinsing.
Solution Approach 2:
The system uses the wound space's own pressure conditions to regulate fluid instillation. The pressure sensor detects the actual pressure state within the wound space, and this self-generated information controls the instillation process, eliminating the need for external manual assessment and automatic preventing both under and over-instillation.
2Device complexity
If manual assessment methods are used to determine instill fluid volume, then device complexity is reduced, but measurement precision and reliability of dosing are compromised
Solution Approach 1:
The patent replaces manual visual assessment with an electronic pressure sensing and control system. Pressure sensor means electronically detect the pressure state, and the control means processes this information to automatically regulate fluid instillation, substituting human judgment with precise electronic measurement and control.
Solution Approach 2:
The pressure sensor means acts as an intermediary between the instillation system and the wound space. It translates the physical pressure state into electrical signals that the control means can process, enabling precise indirect measurement of instill fluid volume through pressure changes.
3Ease of operation
If subjective assessment by user is used to determine dosing point, then ease of operation is improved, but reliability and consistency of treatment outcomes deteriorate
Solution Approach 1:
The control means receives continuous feedback from the pressure sensor means and automatically adjusts the instillation process accordingly. This closed-loop control eliminates subjective user assessment, ensuring consistent and reliable treatment outcomes through objective pressure-based decision making.
Solution Approach 2:
The system automatically regulates its own operation based on real-time pressure measurements from the wound space. The control means independently determines when to interrupt instillation without requiring user intervention, ensuring treatment consistency and reliability.
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
This solution simplifies and automates the dosing of instill fluid, preventing over or under-pressure, promoting optimal wound healing by maintaining a stable negative pressure environment and reducing the frequency of dressing changes, thereby minimizing trauma and costs.
Implementation Method 1
a pressure sensor means (2) which can generate pressure readings
Implementation Method 2
a first pump unit (4) for sucking liquid out of the wound space via the drainage line
Data Source
Figure 1~2
Figure 3~4
AI summary
The wound therapy device (20,40) has pressure sensor (2) to generate the pressure measurement values by sensing pressure in wound space. A pump unit (4) aspirates fluid from wound space to drainage container (1) via drainage line (3). An instillation line (8) delivers instillation fluid from instillation container (7) into wound space. A control unit (5) switches off the pump unit when a predefined upper low-pressure threshold value is reached in wound space, and interrupts the delivery of instillation fluid when a predefined lower low-pressure threshold value is reached. An independent claim is included for method for determining instillation fluid volume for instillation therapy of wound.