Patent ID: 8733359
Filing Date: 2014-05-27
Classification: A61M

Abstract:
1. A collar ( 10 ) of a respiratory device, for use in sealing the respiratory device against the wall of a trachea, wherein the collar ( 10 ) embraces a respiratory tube and is fixed thereto in sealing relationship and the collar comprises an inner film ( 1 ) and an outer film ( 2 ), wherein the inner and the outer films are separate from each other and are of different levels of stretchable elasticity; wherein the stretchable elasticity of the outer film comprises an elastically easily stretchable material and comprises means for bridging over any folds in the inner film when the inner and outer films are under internal pressure with the collar sealed against the trachea, characterised in that the stretchable elasticity of the outer film is expandable at an internal pressure of at most 50 hPa to a diameter which is larger than the diameter of a trachea for which the respiratory device is intended, and wherein the stretchable elasticity of the inner film comprises a material of lower stretchable elasticity than the material of the outer film; wherein the stretchable elasticity of the inner film is characterized such that without an external restriction and at an internal pressure of at most 20 hPa it assumes a diameter which is larger than the diameter of a trachea for which the collar is intended.