Evolution Liners recently introduced the Aura Sealing Sheath. When used with elevated vacuum, it allows the prosthetist to use a custom silicon or polyurethane liner and then apply a sealing ring between the liner and the socket just below the socket brim (the prosthetist determines the height of the sealing ring). This system trumps the complexity of the double wall system and maintains the a more secure proximal skin contact than the single wall systems in which the liner is reflected over the outside of the socket.
For transfemoral applications, there are now three socket design options listed here with thier advantages:
1. Double wall socket- Provides ultimate vacuum and suspension in any range of motion. Because the liner and sleeve make up most of the inner socket, it is flexible and conforms to variations in residual limb volume more than any of the other designs.
2. Single Wall System With Aura Sealing Sleeve- Provides many of the advantages of the double wall system but much simpler and lighter.
3. Single Wall System With Liner Reflected Over Proximal Brim of Socket- The simplest elevated vacuum system, though less flexible and accomodating than the others.
The Aura Sealing Sleeve is a valuable addition to the prosthetist's choices of socket componenets.