The Tissue-TEK Rotatory processor is an electrically operated,
automatic instrument that prepares tissue specimens for microscopic examination.
Tissues are inserted in cassettes, identified and placed into wire mess baskets that
are underneath the hood for processing. The movable hood raises, transports, and lowers
the baskets through a series of ten glass beakers containing reagents and two stainless
steel pots, containing hot paraffin. The tissue is sequentially submerged and oscillated
in fixative, dehydrant, clearing agents and finally immersed in paraffin. The amount of
time the tissues are immersed in each of the reagents is programmed on a timing disc with
12 movable control stops. The disc is marked for a 24-hour time period in 15-minute increments.
The instrument transports the basket to the next beaker each time a control stop is detected.
A separate Delay Timer switch will activate the timing disc at any preset hour within a
72-hour time period. During the immersion time, each beaker is covered with a gravity-type
beaker lid to reduce evaporation of the reagent and hardnening of the paraffin.