Magnetic Nanoparticle Catheter Locking for Tip Hyperthermia

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Solution Overview

Problem

Existing IV catheters face issues with blood clot and biofilm formation, leading to occlusions and increased risk of catheter-related bloodstream infections, with current prevention methods being labor-intensive, ineffective, or promoting antibiotic resistance.

Innovation Solution

A system using a magnetic probe to introduce magnetic nanoparticles into the catheter lock solution, which migrates and heats up at the catheter tip, generating a hyperthermic condition to prevent and treat thrombus formation and biofilm accumulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If regular flushing with saline or heparin is employed to prevent blood clots and biofilms, then catheter patency is maintained, but labor intensity increases and patients must remain connected to infusion lines

Engineering Contradiction:

Improvecatheter patencyVSAvoidlabor intensity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The magnetic nanoparticles autonomously migrate to the catheter tip and generate heat in response to magnetic field stimulation, eliminating the need for continuous manual flushing by healthcare providers. The system self-maintains catheter patency through on-demand hyperthermia therapy.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The mechanical flushing system is replaced with a magnetic field-based system. Instead of physically flushing the catheter with fluids, magnetic nanoparticles are guided by external magnetic fields to the target location where they generate thermal energy to prevent occlusions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If antimicrobial catheters are used to prevent biofilm formation, then bacterial growth is inhibited, but the antimicrobial effects wear off with time

Engineering Contradiction:

Improvebiofilm preventionVSAvoidantimicrobial effect duration

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The system changes the physical parameter of temperature locally at the catheter tip by heating magnetic nanoparticles to hyperthermic levels (40-47°C). This thermal parameter change creates an antimicrobial effect that can be activated and sustained as needed, rather than relying on depleting chemical antimicrobial agents.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If antibiotic lock therapy is used to prevent bacterial growth, then biofilm formation is inhibited, but antibiotic resistant microorganisms develop

Engineering Contradiction:

Improvebacterial growth preventionVSAvoidantimicrobial resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Chemical antibiotic therapy is substituted with a physical therapy approach using magnetic hyperthermia. The magnetic nanoparticles generate thermal energy that kills bacteria through heat damage to cellular structures, avoiding the selection pressure that leads to antibiotic resistance while maintaining effective bacterial growth prevention.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Reliability

If vibration inducing devices are used to prevent occlusion attachment, then biofilm and clot attachment is reduced, but effectiveness decreases with longer catheters and at distal tips

Engineering Contradiction:

Improveocclusion preventionVSAvoidcatheter length adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

Instead of applying vibration uniformly throughout the catheter, the magnetic nanoparticles are selectively concentrated at the distal tip using external magnetic fields. The hyperthermia treatment is locally applied where occlusions are most prevalent, providing effective treatment regardless of catheter length while focusing energy where it is most needed.

Inventive Principle:

Principle #3Local quality

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

Effectively prevents and treats occlusions and biofilms at the catheter tip, reducing the need for frequent catheter removal and minimizing antibiotic resistance, while maintaining catheter patency.

Implementation Method 1

the magnet element causes the magnetic nanoparticles to migrate towards the distal end of the catheter

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

the magnet element causes a temperature of the magnetic nanoparticles to increase, generating a magnetically-induced hyperthermic condition

Methodology Applied

Scientific EffectMagneto-thermal heating: Magnetic Hysteresis

Data Source

PatentUS20260069834A1Lock Solution Having Magnetic Nanoparticles

Publication Date: 2026.03.12 BECTON DICKINSON & CO

AI summary

Provided herein is a system including an IV catheter assembly with a catheter having a distal end positionable intravenously within a patient and a port providing fluid access to the catheter. The system also includes a pre-filled syringe connectable to the port and that contains an aqueous catheter lock solution having magnetic particles suspended therein. The system further includes a probe module comprising a magnetic probe that includes a magnet element and a driver. The magnetic probe is operable in a first driving mode where the magnet element causes the magnetic nanoparticles to migrate towards the distal end of the catheter and is operable in a second driving mode where the magnet element causes a temperature of the magnetic nanoparticles to increase, generating a magnetically-induced hyperthermic condition at the distal end of the catheter that prevents and/or treats thrombus formation and biofilm accumulation in the catheter.