Forming pressure with garments
The pressure is formed in via the relation of the circumferences of the area that needs to be treated and the garment itself. The pressure is calculated based on Laplace’s Law (a principle of physics that the tension on the wall of a sphere is the product of the pressure times the radius of the chamber and the tension is inversely related to the thickness of the wall). The calculatory pressure might not duplicate itself fully on the living tissue due to the variation of it.The pressure class is used to define the lowest and the highest pressures between which the real pressure will fall. In custom-made products the pressure class can be more specifically defined compared to standard sized products. This also allows the use of a greater pressure level more safely than in standard products. The real pressure provided by the garment can be measured with a pressure monitor when the garment is in use. The levels of real pressure during an extensive period of use can be monitored during control visits with pressure monitors.
The units used in pressure treatment are called mercury millimeters (mmHg). Different Lymed® product groups, both in humans and animals, have either a progressive (compression) or an even pressure. The compression created can be divided to four compression classes (from A to IV). These compression classes are based on the European prestandard ENV 12718/2001. The pressure class is chosen based on the injury, diagnose or the area to be treated. In special cases it is possible to have different pressure levels as well as a combination of progressive and even pressure.
The pressure levels used in Lymed Dog™ products are set based on experience – based on different responses, dog’s physiology and human pressure treatment theory. Studies and reports have been used in defining the levels needed for different indications, e.g. a pilot study conducted by the Faculty of Veterinary Medicine at the University of Helsinki on noise phobic dogs.