The hydrocolloid dressing is a dressing containing a
gel-forming substance. And its structure is divided into three layers:
the wound contact surface, polymer matrix, and backing. The main
components are sodium carboxymethyl cellulose, gelatin, pectin, etc.
Besides, elastomeric polymer and adhesives, etc., are also added.
Therefore the dressing is absorbent, self-adhesive, and waterproof. It
is transparent or translucent, biodegradable, and can be used for
different wounds and anatomical parts.
1. What is the difference between the gelation phenomenon of hydrocolloid dressings and wound secretions?
When
a hydrocolloid dressing comes into contact with wound exudate, it
absorbs the fluid and turns it into a gel, a process known as gelation.
The properties of the formed gel are determined by the production
formulations of different manufacturers. The gel formed by the
hydrocolloid dressings of some manufacturers has a certain cohesive
force, and the gel is kept in the structure of the dressing. While the
gel formed by the hydrocolloid dressings of other manufacturers is loose
in texture, and the gel covers the wound and is easy to be damaged,
which is easily mistaken for wound secretions or even mistaken for
infection. Actually, it is not the case.
2. Breathability of hydrocolloid dressings
Although
the hydrocolloid dressing is wet, the permeability is also outstanding,
The hydrocolloid dressing in the intact state is not easily permeable
to water vapor, but when the gelation process begins, the permeability
of the dressing will increase. Excess moisture can be lost through the
dressing in the form of water vapor, thereby enhancing the dressing's
ability to absorb exudate. At the same time, hydrocolloid dressings can
maintain a good moist environment. Since the backing of the hydrocolloid
dressing is a semi-permeable material (usually a polyurethane film), it
can effectively prevent the invasion of external bacteria and viruses,
and at the same time keeps a good water resistance. Therefore, whether
it is a wet wound or a dry, it is easy to stick the dressing to it.
3. Main indications of hydrocolloid dressings
Hydrocolloid
dressings have a moderate ability to absorb exudate and are mainly used
for cleaning granulation wounds with low to moderate amounts of
exudate, generally superficial wounds. According to the theory of wound
healing, hydrocolloid dressings are generally used in the middle and
late stages of healing, that is, the granulation and the epithelial
stage. At this time, the wound exudation is reduced, but a moist
environment needs to be maintained. So they are the most suitable stages
in which hydrocolloid dressing can be used. Hydrocolloid dressings can
ensure good sealing; for dry wounds, they can soften necrotic tissue and
are often used clinically to accelerate autolytic debridement of
tissues, that is, use transparent hydrocolloid dressings as two-layer
dressings to seal the hydrogel. After a period of time, some
difficult-to-remove tissues will become easy to remove. Hydrocolloids
are used for the prevention and treatment of phlebitis, which has been
proved by clinical trials. Hydrocolloid dressings can also be used for
fixing some devices, such as various catheters.
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