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Modified-Release Drug Delivery Systems: Rate-Programmed II

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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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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Controlling Antibiotic Release from Polymethylmethacrylate Bone Cement.

Victoria Wall1,2, Thi-Hiep Nguyen3,4, Nghi Nguyen3,4

  • 1Faculty of Medicine (Princess Alexandra Hospital), St Lucia Campus, The University of Queensland, Brisbane, QLD 4072, Australia.

Biomedicines
|January 6, 2021
PubMed
Summary
This summary is machine-generated.

Antibiotic-loaded bone cements (ALBCs) aim to prevent joint infections but struggle with controlled antibiotic release and toxicity. Future research needs improved in vitro models to predict in vivo performance for better implant integration.

Keywords:
PMMAantibioticsbacterial infectionbone implantcementdeliveryrelease

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Area of Science:

  • Orthopaedic Surgery
  • Biomaterials Science
  • Infectious Diseases

Background:

  • Bone cement is crucial in orthopaedic surgery for implants and bone defects.
  • Antibiotic-loaded bone cements (ALBCs) deliver high local antibiotic concentrations to combat prosthetic joint infections.
  • However, high antibiotic levels can cause tissue toxicity, necessitating controlled release.

Purpose of the Study:

  • To review the current state of ALBCs regarding antibiotic release characteristics.
  • To explore advancements in controlling antibiotic release and enhancing osteo-conductivity/inductivity.
  • To highlight the need for improved in vitro models for predicting in vivo antibiotic concentrations.

Main Methods:

  • Literature review of prosthetic joint infections.
  • Analysis of therapeutic efficacy and toxicity of antibiotics in bone cement.
  • Examination of current ALBCs and their release profiles.
  • Discussion of research in controlled antibiotic release and osteo-conductive/inductive properties.

Main Results:

  • Current ALBCs require significant improvements in regulating antibiotic release.
  • Balancing effective infection control with reduced tissue toxicity is a key challenge.
  • Optimizing antibiotic release is critical for successful prosthesis integration.

Conclusions:

  • Developing ALBCs with predictable and controllable antibiotic release is essential.
  • Enhancing osteo-conductivity and osteo-inductivity alongside controlled release is a research focus.
  • Improved in vitro experimental designs are needed to accurately predict in vivo local antibiotic concentrations.