In an example embodiment, a beacon is sent on all available interfaces of a device comprising data indicating the operating parameters of all interfaces of the device. The hinge structure includes a first joint extended from a rear panel of the case body, a supporting arm having a front biasing surface and a rear biasing surface, and second joint which is extended from the rear wall of the case cover and has a holding slot to define a closed stopping surface and an opened stopping surface. The downhole safety valve further comprises at least one flow passage which extends through the body and communicates between the first and second portions of the production bore, and at least one closure member which is disposed across the flow passage to control fluid flow between the first and second portions of the production bore. To enhance the tumor contrast in the image, aqueous solutions of toluidine blue or methylene blue are topically applied.