NPWT Apparatus Leak Detection via Pressure Monitoring

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Solution Overview

Problem

Existing wound dressing technologies for negative pressure therapy lack effective methods for detecting leaks and blockages in the fluid flow path, which can compromise the efficacy of the therapy and lead to patient discomfort.

Innovation Solution

A negative pressure wound therapy apparatus equipped with a pressure sensor and a controller that measures pressure and flow rate in the fluid flow path, detects leaks and blockages by analyzing these parameters, and provides an indication of their presence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If negative pressure therapy is applied to a wound, then wound healing is promoted, but leaks or blockages in the fluid flow path cannot be detected

Engineering Contradiction:

Improvetherapy efficacyVSAvoidleak and blockage detection

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The system continuously monitors pressure in the fluid flow path and uses this feedback to detect leaks or blockages. The controller compares the monitored pressure against expected pressure ranges to identify abnormal conditions, enabling real-time detection without compromising therapy efficacy.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces complex mechanical flow measurement devices with a pressure-based detection system. By monitoring pressure changes in the fluid flow path, the system can infer the presence of leaks or blockages without requiring direct mechanical measurement of fluid flow.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Difficulty of detecting and measuring

If pressure sensors and control systems are added to detect leaks, then leak detection capability is improved, but device complexity increases

Engineering Contradiction:

Improveleak and blockage detectionVSAvoidsystem structure

Core Design Contradiction:

Difficulty of detecting and measuringVSDevice complexity

Solution Approach 1:

The pressure sensor serves multiple functions: it monitors therapy delivery, detects leaks, identifies blockages, and provides data for flow rate calculation. This multi-functionality reduces the need for separate detection systems, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses its existing pressure monitoring infrastructure to simultaneously perform leak and blockage detection without requiring additional dedicated sensors or complex hardware additions. The controller processes pressure data to identify multiple abnormal conditions using the same measurement system.

Inventive Principle:

Principle #25Self-service

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 apparatus effectively detects leaks and blockages, ensuring the integrity of the negative pressure therapy, promoting wound healing, and reducing patient discomfort.

Implementation Method 1

a pressure sensor configured to measure pressure in a fluid flow path configured to fluidically connect the wound dressing and the source of negative pressure

Methodology Applied

Scientific EffectPressure measurement:

Implementation Method 2

a source of negative pressure configured to be in fluidic communication with a wound dressing, the source of negative pressure configured to aspirate fluid from the wound

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Implementation Method 3

The apparatus can include a tachometer configured to measure the speed of the motor. The controller can be further configured to measure a first plurality of motor speeds during a first period of time and to average the first plurality of motor speeds, the average being indicative of the rate of flow

Methodology Applied

Scientific EffectSpeed measurement:

Data Source

PatentUS20250025349A1Reduced pressure therapy apparatus construction and control

Publication Date: 2025.01.23 SMITH & NEPHEW INC

AI summary

Embodiments of negative pressure wound therapy systems and methods for operating the systems are disclosed. In some embodiments, a system includes a pump assembly, canister, and a wound dressing configured to be positioned over a wound. The pump assembly, canister, and the wound dressing can be fluidically connected to facilitate delivery of negative pressure to a wound. The pump assembly can present graphical user interface screens for controlling and monitoring delivery of negative pressure. The system can be configured to efficiently deliver negative pressure and to detect and indicate presence of certain conditions, such as low pressure, high pressure, leak, canister full, and the like. Monitoring and detection of operating condition can be performed by measuring one or more operational parameters, such as pressure, flow rate, and the like.