Metastable Diamagnetic Nanoparticle 3D Navigation

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Solution Overview

Problem

Traditional methods for navigating magnetic nanoparticles in 3D space for medical applications, such as targeted drug delivery and deep-brain stimulation, face limitations in spatial and temporal resolutions, making it difficult to accurately direct nanoparticles to specific points in the brain, especially at the single-neuron level.

Innovation Solution

Transforming magnetic nanoparticles into metastable diamagnetic nanoparticles by matching their magnetic moment relaxation time with external magnetic field pulses, allowing them to be navigated using magnetic field gradients to points with minimum magnetic field strength, which can be controlled by adjusting electromagnet currents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional magnetic field gradient methods are used to navigate magnetic nanoparticles, then nanoparticles can be transported in 3D space, but spatial resolution is limited to 1-mm level and cannot achieve single-neuron precision

Engineering Contradiction:

Improvespatial resolutionVSAvoidimage-guided negative feedback loop

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent changes the magnetic susceptibility parameter of nanoparticles from positive (paramagnetic) to negative (diamagnetic) by transforming them into metastable diamagnetic nanoparticles. This fundamental parameter change enables navigation toward minimum magnetic field points rather than maximum points, achieving superior spatial resolution without requiring complex image-guided feedback loops.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent inverts the traditional navigation approach by using diamagnetic nanoparticles that move toward minimum magnetic field points instead of maximum points. This inversion allows direct navigation to arbitrary 3D points by creating minimum points at desired locations, eliminating the need for iterative image-guided feedback control and achieving micrometer-level spatial resolution.

Inventive Principle:

Principle #13The other way round (Inversion)

2Force

If magnetic field strength is increased to improve navigation control, then nanoparticles can be directed more effectively, but magnetic field strength decreases as it moves farther from the source

Engineering Contradiction:

Improvemagnetic forceVSAvoidmagnetic field range

Core Design Contradiction:

ForceVSLength of stationary object

Solution Approach 1:

By changing the magnetic susceptibility of nanoparticles from positive to negative, the patent enables effective navigation forces to act over longer distances. Diamagnetic nanoparticles experience force toward minimum field points, allowing navigation control even when magnetic field strength is naturally weaker at greater distances from the source.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If time-controlled image-guided navigation is used, then nanoparticles can be directed to desired locations, but temporal resolution is severely limited and cannot achieve real-time control

Engineering Contradiction:

Improvetemporal resolutionVSAvoidnavigation time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent eliminates time-consuming iterative feedback loops by inverting the navigation approach. Diamagnetic nanoparticles naturally navigate toward minimum magnetic field points through direct magnetic force, enabling real-time control and high temporal resolution without requiring repeated imaging and feedback adjustments.

Inventive Principle:

Principle #13The other way round (Inversion)

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

Enables high-precision navigation of magnetic nanoparticles with improved spatial resolution, facilitating targeted treatments at the neuronal level for neurodegenerative diseases and other medical applications.

Implementation Method 1

Transforming magnetic nanoparticles into metastable diamagnetic nanoparticles

Methodology Applied

Scientific EffectDiamagnetism: Diamagnetism

Implementation Method 2

matching their magnetic moment relaxation time with the frequency of external magnetic field pulses

Methodology Applied

Scientific EffectMagnetic moment relaxation:

Implementation Method 3

As diamagnetic nanoparticles move towards weaker magnetic fields, the metastable diamagnetic nanoparticles can be navigated to any point in a 3D space via the application of magnetic field gradients

Methodology Applied

Scientific EffectMagnetic field gradient force: Lorentz Force

Data Source

PatentUS10300011B13D navigation of nanoparticles via induction of metastable diamagnetic response

Publication Date: 2019.05.28 FLORIDA INTERNATIONAL UNIVERSITY

AI summary

Methods and devices for three-dimensional navigation of magnetic nanoparticles are provided. A method can comprise introducing high-anisotropy magnetic nanoparticles to a mammal and directing the high-anisotropy magnetic nanoparticles towards a target region of the mammal. Direction control is achieved by subjecting the high-anisotropy magnetic nanoparticles to an alternating signal comprising a uniform magnetic field pulse having a strength greater than a coercivity of the high-anisotropy magnetic nanoparticles and a magnetic gradient pulse having a highest strength that is less than the coercivity of the high-anisotropy magnetic nanoparticles and a location of a lowest strength at the target region of the mammal, and the direction of the uniform magnetic field pulse being in an opposite direction of the magnetic gradient pulse.