A device for engaging a leg near the knee includes a cradle having a lateral portion with a lateral axial length, a medial region, and a dorsal portion connecting between the lateral section and the medial region. In some aspects, a wiper member provides additional clearance between the flow tube and housing to compensate for scale buildup. The drying temperature in the drying of the applied layer 41 is controlled within a range of 200 to 500\xb0 C.