Microsensor for physiological pressure measurement

摘要

A body implantable sensor for sensing pressure in an environment within internal body tissue is described. In an implementation, the sensor includes a housing, an optical waveguide and a diaphragm with a reflective surface that faces a waveguide distal end and that reflects at least a portion of the signals exiting the waveguide distal end back into the waveguide. The diaphragm is movable relative to the waveguide end. The distance between the waveguide distal end and the diaphragm reflective surface is determined by pressure forces acting on a sensing surface of the diaphragm that is opposite the reflective surface. A cover surrounds the diaphragm and protects it from impingement, but leaves the diaphragm sensing surface exposed to pressure forces. In some implementations, an attachment mechanism stabilizes the sensor when implanted in the bodily tissue.