Patent attributes
When an observation target in a membranous tissue such as an amniotic membrane filled with a liquid such as an amniotic fluid is observed, the observation is performed without leaking the liquid. There is provided an observation method of an observation target arranged in a membranous tissue filled with a body fluid, comprising: a step for coating a gel-like adhesive on the outer surface of the membranous tissue; a step for cutting the membranous tissue through the coated adhesive; a step for inserting the distal end of the objective unit through the adhesive and the open cut in the membranous tissue; and a step for observing the observation target through the inserted distal end of the objective unit.