To detect a pressure applied on a patient by detecting a pressure value applied on a mat minutely.
The mat using a two-dimensional spreading signal transmission technology comprising a layer where a plurality of communication modules are scattered, a plurality of conductive layers for electrically connecting each of the plurality of communication modules, at least two insulating layers stacked to have the layer with the plurality of scattered communication modules and the conductive layers between them, and a plurality of pressure sensors which are two-dimensionally arranged in either layer and communicate with each of the plurality of communication modules is formed. The rigidity of at least one downside layer which is located in the direction of gravitational force in terms of a pressure sensor layer in which the pressure sensors are arranged and includes the layer including a placement surface of the mat is increased than that of the upper side layer stacked on the side opposite to the downside layer across the pressure sensor layer.
MATSUMOTO MITSUHIRO
TSUDA KOJI
