Films/Membranes

Polyurethane (PU) Film Wound Dressings

Polyurethane (PU) films are thin, biocompatible transparent dressings which are coated with a hypoallergenic acrylic-based pressure sensitive adhesive.

Such films provide a flexible transparent covering to protect the wound surface whilst maintaining a moist environment conducive for healing. The film is moisture vapour permeable which means that excess moisture from wound exudate and skin transpiration can be vented.

AMS films provide a flexible transparent covering to protect the wound surface whilst maintaining a moist environment conducive to healing.

Properties

In general, the polymers consist of three types of blocks: hard, soft and hydrophilic. By varying the relative proportions of these blocks in the final polymer, the strength, elasticity and MVTR can be varied to produce a film with specific properties. However some properties are mutually exclusive; for example increasing the MVTR and/or elasticity results in a decrease in tensile strength.

Performance

The key performance parameter for films is the ability to extend the wear time of the primary dressing.

Films do this by controlling the moisture content of wound pad. AMS films have excellent MVTR rates compared with the leading competitors