Wound healing is a complex and dynamic physiological
process consisting
of a series of cellular and molecular events that initiate immediately
after a tissue lesion, to reconstruct the skin layer. It is indubitable
that patients with chronic wounds, severely infected wounds, or any
metabolic disorder of the wound microenvironment always endure severe
pain and discomfort that affect their quality of life. It is essential
to treat chronic wounds for conserving the physical as well as mental
well-being of affected patients and for convalescing to improve their
quality of life. For supporting and augmenting the healing process,
the selection of pertinent wound dressing is essential. A substantial
reduction in healing duration, disability, associated cost, and risk
of recurrent infections can be achieved via engineering wound dressings.
Hydrogels play a leading role in the path of engineering ideal wound
dressings. Hydrogels, comprising water to a large extent, providing
a moist environment, being comfortable to patients, and having biocompatible
and biodegradable properties, have found their success as suitable
wound dressings in the market. The exploitation of hydrogels is increasing
perpetually after substantiation of their broader therapeutic actions
owing to their resemblance to dermal tissues, their capability to
stimulate partial skin regeneration, and their ability to incorporate
therapeutic moieties promoting wound healing. This review entails
properties of hydrogel supporting wound healing, types of hydrogels,
cross-linking mechanisms, design considerations, and formulation strategies
of hydrogel engineering. Various categories of hydrogel wound dressing
fabricated recently are discussed based on their gel network composition,
degradability, and physical and chemical cross-linking mechanisms,
which provide an outlook regarding the importance of tailoring the
physicochemical properties of hydrogels. The examples of marketed
hydrogel wound dressings are also incorporated along with the future
perspectives and challenges associated with them.
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