I am cryosectioning lung samples and wanted to insert the OTP into the lungs through the trachea however, I do not know how to tie off the trachea or what to use to maintain fluid in the lung.
I have some experience during thoracic surgery and limited knowledge in the laboratory environment. Maybe you can use a simple clip or just learn to make a surgical tie after OTP inserting. Maybe a picture or drawing could be more clear about your question.