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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...
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Localized cell and drug delivery for auditory prostheses.

Jeffrey L Hendricks1, Jennifer A Chikar, Mark A Crumling

  • 1Department of Biomedical Engineering, The University of Michigan, 1107 Gerstacker Building, 2200 Bonisteel Boulevard, Ann Arbor, MI 48109-2099, USA. jlhendri@umich.edu

Hearing Research
|June 25, 2008
PubMed
Summary

Localized drug delivery to the cochlea improves auditory prostheses (APs) by reducing side effects and enhancing function. This approach optimizes the tissue-device interface, improving safety and effectiveness for better hearing outcomes.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Otolaryngology

Background:

  • Auditory prostheses (APs) offer solutions for hearing loss but face limitations like tissue reactions, nerve degeneration, and infections.
  • Current APs can cause adverse effects such as limited tonal/dynamic ranges and channel interactions.
  • Tissue responses and neural degeneration significantly impact AP performance and patient outcomes.

Purpose of the Study:

  • To explore localized cell and drug delivery strategies for improving auditory prostheses (APs) safety and efficacy.
  • To address limitations of APs, including adverse tissue reactions, infections, and suboptimal stimulation resolution.
  • To optimize the tissue-device interface for enhanced AP function and reduced complications.

Main Methods:

  • Review of pharmaceutical compounds promoting auditory tissue viability and preventing inflammation/infection.
  • Exploration of cell delivery and gene therapy for hearing loss and neural degeneration.
  • Analysis of localized and sustained drug delivery methods for APs, including integration into devices.

Main Results:

  • Localized drug delivery offers better control over drug concentrations, minimizing systemic side effects.
  • Pharmaceutical agents and localized delivery techniques can mitigate tissue reactions, inflammation, and infection.
  • Cell and gene therapies show promise in treating hearing loss and reversing neural degeneration.

Conclusions:

  • Localized cell and drug delivery strategies can significantly improve the safety and performance of auditory prostheses.
  • Integrating advanced drug delivery techniques into APs optimizes the tissue-device interface, reducing risks of infection and rejection.
  • These approaches enhance tissue viability and neural function, leading to improved auditory perception and AP effectiveness.