What is Dry Floatation?
Last week, we heard from Mal on the impact that Mr. Graebe and ROHO had on his life and he used the words “DRY FLOATATION™ Technology”. This week we are going to dive a little deeper into the design of a ROHO cushion and explain what Dry Floatation is. In designing the ROHO cushions, Mr. Graebe realised the best way to protect the skin would be if the client could be placed in water because of the benefits of floating. He knew that it would be impractical to achieve true floatation in a cushion, so Mr. Graebe concentrated on achieving the same type of floatation but used air instead of water. This idea developed into what is known as DRY FLOATATION™ Technology, and it’s a ROHO exclusive. Mr. Graebe spent many years in his garage working on his idea of Dry Floatation and in 1971 he released the first ever ROHO cushion – a high profile ROHO cushion.
The adjustable air-filled cushions and mattresses mimic the pressure relieving properties of water, removing friction and delivering stability and comfort no matter where you go or what you do. DRY FLOATATION™ Technology is based on 4 principles characteristics of water that causes floatation.
Here are the 4 principles:
1. Low Surface Tension – Fluids have very low surface tensions, which allow an object to penetrate its surface with little force. The ROHO design of many small interconnected air cells made of a soft, pliable neoprene rubber results in a very low surface tension. This limits the amount of skin deformation.
2. Constant Restoring Forces – both air and water have very small molecular forces of attraction that can be displaced. This displacement provides hydrostatic forces, or floatation, that are nearly constant no matter how deeply immersed the object is. What this means is that the ROHO cushion allows a person to sit immersed in the cushion for long periods without an increase in pressure over time.
3. Six Degrees of Freedom – Each cell within a ROHO cushion can move in any direction, allowing the cushion to move with the body, in the same way water moves. The result is that instead of the skin and underlying tissue deforming, the cushion itself deforms. This minimises both friction and shear forces.
4. Low Friction and Shear – Friction occurs when two surfaces rub together. The courser the surface, the more friction exists, increasing the likelihood of tissue breakdown. ROHO cushions and mattresses are made of a neoprene rubber that has been treated to reduce friction to minimal levels. Shear is a lateral force that occurs at a deep tissue level. This is the result of friction holding the skin in one place while gravity pulls the skeleton and attached tissues down. Shear can be a major issue when someone is lying in bed with the bed head elevated, or for someone seated with kyphosis and a posterior tilt of the pelvis. By minimising friction with the coating of the neoprene, as well as the size Degrees of Freedom, DRY FLOATATION™ Technology reduces shear forces.
Whether you are sitting on a ROHO cushion, you have a friend or family member that uses a ROHO, or maybe you have gotten a ROHO cushion for your client, hopefully you see just how much thought went into the design behind ROHO. We want to thank Mr. Graebe again for his contribution and positive impact on the lives of so many.
For more information on pressure injuries check out the Pan Pacific Prevention and Treatment of Pressure Ulcers: Quick Reference guide. http://www.woundsaustralia.com.au/ptpu/index.php
Rachel and Mal