Abstract: An acceleration sensor device capable of a variant response to acceleration(s) as they may occur in all directions in any axis. The sensor may further discriminate, filter, or target a specific envelope of accelerations. Detection is accomplished through the means of an optoelectronic sensing device controlling an electronic circuit by a design-specific resilient member and associated counterweight. The sensor may be configured for a wide range of automatic responses and triggered circuit hold times, and may be automatically or manually reset to a static state.

Abstract: The tissue expander includes a shell with a base layer and an expansion layer that define an expansion chamber therebetween. A conduit or fill tube extends from the shell and is the sole source of communication with the expansion chamber. The base and expansion layers are thermoplastically joined together by a major seam and a minor seam. The major seam is substantially concealed within the expansion chamber whereas the minor seam defines a border portion of the expansion chamber and is not concealed. The tissue expander can be of any selected size and shape. The base layer can be made expandable along with the expansion layer or nonexpandable as desired.