A quick-release tube clamp and method therefor for locking and releasing a prosthetic pylonfoot component from the socket. In an embodiment, the display device includes a laminate screen including a Fresnel lens lamina having a non-planar input surface, a substantially planar output surface and a first index of refraction. The chip 21 is separated from the silicon wafer 20 by etching the wafer along a separation line 22 parallel to the first direction of the wafer and by dicing the wafer 20 along a separation line 23 parallel to the second direction of the wafer. The gas blender provides an auxiliary mixed gas source for use by an auxiliary piece of equipment such as a nebulizer or resuscitation bag.