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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...
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Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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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...
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Magnetically Actuated Soft Capsule With the Multimodal Drug Release Function.

Sehyuk Yim1, Kartik Goyal1, Metin Sitti1

  • 1Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213 USA.

IEEE/ASME Transactions on Mechatronics : a Joint Publication of the IEEE Industrial Electronics Society and the ASME Dynamic Systems and Control Division
|November 8, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a novel magnetically actuated soft capsule endoscope for targeted drug delivery in gastric disease treatment. It offers two release modes, controlled by magnetic fields, enabling precise and localized therapeutic interventions.

Keywords:
Capsule endoscopedrug deliverymagnetic micro-robotmedical robotics

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Area of Science:

  • Biomedical Engineering
  • Gastroenterology
  • Drug Delivery Systems

Background:

  • Gastric disease treatment often requires localized drug delivery.
  • Current capsule endoscopy lacks active therapeutic capabilities.
  • Minimally invasive drug delivery methods are in high demand.

Purpose of the Study:

  • To develop and evaluate a magnetically actuated multimodal drug release mechanism using a soft capsule endoscope.
  • To enable precise, localized drug delivery for gastric disease treatment.
  • To explore two distinct drug release modes controlled by external magnetic fields.

Main Methods:

  • Design and fabrication of a tetherless soft capsule endoscope with a central drug chamber and magnetic heads.
  • Application of external magnetic fields (0.01-0.03 T pulsed, 0.07 T continuous) to actuate drug release.
  • Experimental validation of drug release control via magnetic field frequency and strength.
  • Simulation and experimental evaluation of the capsule's drug release capability and polymeric coating formation.

Main Results:

  • Demonstrated continuous drug release controlled by magnetic pulse frequency (0.01-0.03 T).
  • Achieved bulk drug release (approx. 800 mm³) using a stronger magnetic field (0.07 T), inducing capsule collapse and polymeric coating.
  • Showcased that the coated area is dependent on drug viscosity.
  • Validated the magnetically actuated multimodal drug release capability through simulations and experiments.

Conclusions:

  • The proposed soft capsule endoscope offers a promising magnetically actuated multimodal drug release mechanism.
  • This technology enables precise, localized drug delivery for gastric disease treatment.
  • The tetherless, minimally invasive device represents a next-generation tool for therapeutic capsule endoscopy.