How do hydrogels release drugs?
The drugs are released either by dissociation from the entrapped particles followed by diffusion through the hydrogel, or by release of the particles from the hydrogel. One type of widely used polymeric particle is poly(lactic-co-glycolic acid) (PLGA), which releases the encapsulated drug via hydrolysis.
Why is hydrogel used for drug delivery?
Hydrogel delivery systems can leverage therapeutically beneficial outcomes of drug delivery and have found clinical use. Hydrogels can provide spatial and temporal control over the release of various therapeutic agents, including small-molecule drugs, macromolecular drugs and cells.
What is drug release profile?
5.1 Drug release profile. The drug release profile is a key factor in the performance of a DES [71]. Put simply, the optimal drug release profile will be one that ensures that the arterial wall concentrations of the drug are maintained at the therapeutic dose within the target cells for the period required.
What type of hydrogel is used for drug delivery?
Thermosensitive in situ hydrogels, which are commonly utilized for drug delivery purposes are liquid at room temperature (20–25°C) and form viscous gels at body temperature (34–37°C). The polymers used in these systems have a lower critical solvent temperature; the temperature at which the sol–gel transition occurs.
Does hydrogels give sustained drug delivery?
The attractive physical properties of hydrogels, especially their porosity, offer tremendous advantages in drug delivery applications such as sustained release of the loaded drug.
What is an injectable hydrogel?
Injectable hydrogels have been extensively researched for the use as scaffolds or as carriers of therapeutic agents such as drugs, cells, proteins, and bioactive molecules in the treatment of diseases and cancers and the repair and regeneration of tissues.
How does hydrogel drug delivery work?
The swelling-controlled drug release from hydrogels uses drugs dispersed within a glassy polymer which when in contact with a bio-fluid begins swelling. The expansion during swelling occurs beyond its boundary facilitating the drug diffusion along with the polymer chain relaxation.
What is IntraUterine drug delivery?
An IntraUterine System (IUS) or IntraUterine Drug Delivery System (IUDDS) is a small object that is placed inside the uterus above the endometrium and is active or medicated when it contains a therapeutic agent. This system is a combination of drug/device that slowly releases the active ingredient [2], [6].
What is a release profile?
The Release Profiles defined herein is a subset of the descriptions for Releases, including their components and the order/grouping of such Resources as used in the relevant “full” message suite standard.
What is control drug delivery?
A controlled drug delivery system is aimed at releasing the correct dose of a therapeutic directly in the desired zone and during the required period of time. This allows maximizing the efficacy of the therapeutic and minimizing the possible side effects.
Can hydrogels be injected?
Injectable hydrogels have the benefits to overcome such drawbacks in the medical use of pre-formed hydrogels. They not only have the typical advantages of conventional hydrogels as mentioned above but can also be injected with minimal invasiveness into target sites and used for irregularly shaped sites.
Are hydrogels the future of drug delivery?
The controlled release of drugs at precise locations within the body can prevent systemic toxicity and deliver accurate dosages to patients. Hydrogels have recently been investigated as promising drug delivery systems due to their ability to provide spatial and temporal control over the release of a number of therapeutic agents.
What is the release mechanism of hydrogels?
One of the release mechanisms of therapeutic agents is based on the controlled degradation of the hydrogel that carries the drug. In this case, the decrease in the viscoelastic properties of the hydrogel is proportional to the amount of released drug [2].
What are the requirements for hydrogel delivery systems?
In general, the fabrication of hydrogel delivery systems needs to maintain the drug bioactivity, and through packaging, transport and storage, both the drug and hydrogel must be chemically and physically stable.
What is the clinical use of hydrogels in medicine?
The clinical use of drug delivery systems is appreciable7, with a global market of over $150 US billion in 2013. Hydrogels are a particularly appealing type of drug delivery system, and have been used in many branches of medicine, including cardiology, oncology, immunology, wound healing, and pain management.
