Negative Pressure Wound Therapy Leakage Control

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Solution Overview

Problem

Negative-pressure wound therapy systems face challenges in maintaining effective pressure levels due to leaks, which can impede wound healing and are costly and complex to operate.

Innovation Solution

A system comprising a porous pad, a drape, a pump, a flow rate sensor, and a controller that monitors and adjusts the flow rate to maintain a minimum level by inducing air leakage from the external environment when necessary, ensuring effective treatment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the system uses a sealed environment to maintain negative pressure, then wound pressure control is improved, but system complexity increases due to leak monitoring and active compensation mechanisms

Engineering Contradiction:

Improvewound pressure controlVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system uses the existing leakage path (through the porous dressing) as a beneficial feature rather than treating it purely as a problem to be sealed. The controller monitors flow rate and actively compensates by adjusting pump operation to maintain minimum flow rates, turning the leakage into a self-regulating feature that promotes wound healing while maintaining pressure control.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system dynamically adjusts pump operation parameters based on real-time flow rate measurements. When flow rate drops below the minimum threshold, the controller increases pump power or changes pump cycle timing to restore adequate flow, thereby maintaining effective negative pressure despite system leakage.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the system allows some leakage to maintain minimum flow rate, then wound healing effectiveness is improved, but pressure stability deteriorates due to uncontrolled air intake

Engineering Contradiction:

Improvewound healing effectivenessVSAvoidpressure stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The system continuously monitors flow rate through sensors and uses this feedback to adjust pump operation in real-time. The controller compares measured flow rates against minimum thresholds and dynamically modifies pump power or cycling to maintain flow rates within the therapeutic range, thereby stabilizing pressure despite the presence of leakage.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system transitions from a static sealed environment to a dynamic controlled environment where the pump operation is continuously adjusted based on real-time conditions. The controller modulates pump power or cycling frequency to adapt to changing leakage conditions, maintaining effective flow rates while managing pressure stability.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the system increases pump power to compensate for leakage, then flow rate is maintained, but energy consumption increases

Engineering Contradiction:

Improveflow rate maintenanceVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system uses periodic or cyclic pump operation rather than continuous high-power operation. The controller adjusts pump cycling frequency and duty cycle based on measured flow rates, allowing the pump to operate at lower average power while still maintaining minimum flow rates through strategic timing of pump activation.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system applies just enough pump power to maintain minimum therapeutic flow rates rather than continuously applying maximum power. The controller modulates pump operation to provide sufficient compensation for leakage only when necessary, reducing overall energy consumption while maintaining effective treatment.

Inventive Principle:

Principle #16Partial or excessive action

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 effectively maintains wound pressure, promoting healing by ensuring a consistent flow rate and reducing the complexity and cost of therapy.

Implementation Method 1

reducing pressure in proximity to a tissue site can augment and accelerate growth of new tissue at the tissue site

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Implementation Method 2

a flow rate sensor having an input fluidly coupled between the pump and the porous pad and an output for providing a flow-rate signal representing a flow rate (FR) of fluids

Methodology Applied

Scientific EffectFlow rate measurement:

Data Source

PatentUS20230310218A1Apparatus for controlling leakage of a reduce pressure therapy system

Publication Date: 2023.10.05 KCI MFG UNLIMITED CO

AI summary

In one example embodiment, a system for stimulating healing of tissue at a wound site is disclosed. The system comprises a dressing including a porous pad and a drape covering the pad at a wound site for maintaining negative pressure at a wound site, a negative- pressure source including a pump and an electric motor to generate a pump pressure for applying to the wound site, and a first pressure sensor for sensing the pump pressure. The system further comprises a controller coupled to the first pressure sensor and electric motor and a regulator coupled to the controller for inducing leakage into the therapeutic environment of the system to maintain a minimum level of fluid flow within the dressing.