Pressure detection arrangement

A pressure detection arrangement for placement intermediate a part of the body and means surrounding the part of the body and comprising, in combination:

• a capsule comprising:
• a reservoir means having first walls and second walls defining a reservoir cavity, and said first walls further defining a lower portion of said reservoir cavity having a first predetermined flexibility, and said second walls further defining an upper portion of said reservoir cavity having a second predetermined flexibility;
• an indicator means having third walls defining an indicator cavity having a third predetermined flexibility having a preselected transmissivity for electromagnetic radiation in the visible portion of the electromagnetic radiation spectrum to allow visual inspection therethrough of said indicator cavity;
• said first walls coupled to said second walls;
• said second walls further defining a first aperture through said second walls;
• said third walls coupled to said second walls adjacent said first aperature;
• a flexible, extensible separation means across said first aperture to close communication between said reservoir cavity and said indicator cavity;
• and
• an indicator fluid in said reservoir cavity and said separation means responsive to a predetermined pressure exerted on said indicator fluid in said reservoir cavity to flexibly extend into said indicator cavity to allow said indicator fluid to enter said indicator cavity and said separation means separating it from said third walls of said indicator means by said indicator fluid for the condition of said reservoir cavity subjected to at least said predetermined pressure.