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Related Concept Videos

Modified-Release Drug Delivery Systems: Classification01:23

Modified-Release Drug Delivery Systems: Classification

Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...
Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
Propagation of Action Potentials01:23

Propagation of Action Potentials

The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Modified-Release Drug Delivery Systems: Rate-Programmed I01:22

Modified-Release Drug Delivery Systems: Rate-Programmed I

Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...

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Related Experiment Video

Updated: May 9, 2026

Focused Ultrasound Induced Blood-Brain Barrier Opening for Targeting Brain Structures and Evaluating Chemogenetic Neuromodulation
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Focused Ultrasound Induced Blood-Brain Barrier Opening for Targeting Brain Structures and Evaluating Chemogenetic Neuromodulation

Published on: December 22, 2020

Spatiotemporal Pathway Control for Targeted Drug Delivery: A unified Waveform Modulation in Molecular Communication.

Ming Tan, Yue Sun, Hanyu Xiao

    IEEE Transactions on Nanobioscience
    |May 7, 2026
    PubMed
    Summary

    A new waveform modulation framework enhances nanoparticle drug delivery control. Magnetic navigation optimizes pathways, improving targeting and maintaining drug concentrations within safe therapeutic windows for diverse medications.

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    Predicting Gene Silencing Through the Spatiotemporal Control of siRNA Release from Photo-responsive Polymeric Nanocarriers

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    Area of Science:

    • Biomedical Engineering
    • Nanotechnology
    • Molecular Communication

    Background:

    • Precise drug delivery necessitates control over release, propagation, and targeting.
    • Existing methods face challenges in achieving full-chain control of nanoparticle behavior.

    Purpose of the Study:

    • To propose a unified waveform modulation framework for nanoparticle drug delivery.
    • To enable full-chain control of nanoparticle behavior from release to reception.
    • To integrate magnetic-field-assisted navigation for pathway optimization.

    Main Methods:

    • Developed a waveform modulation framework inspired by molecular communication.
    • Implemented magnetic-field-assisted navigation for spatiotemporal pathway control.
    • Utilized COMSOL Multiphysics simulations to model nanoparticle motion and accumulation.
    • Evaluated the framework using Digoxin and Ibuprofen as case studies.

    Main Results:

    • Magnetic-field-assisted pathway control increased NP accumulation at the target region by 75.3%.
    • The framework successfully maintained drug concentrations within the therapeutic window for both narrow and wide therapeutic index drugs.
    • Demonstrated tighter regulation for Digoxin to minimize toxicity risks.

    Conclusions:

    • Waveform modulation offers a unifying paradigm for controlling nanoparticle drug delivery across all stages.
    • Magnetic pathway control enhances targeting efficiency and therapeutic window regulation within vascular constraints.
    • The framework shows potential for generalizable and personalized drug delivery strategies.