How do Cryostats work?
A cryostat places a microtome inside an insulated chamber cooled by one or two refrigeration compressors. The chamber and often a separate specimen stage are brought to between –15 and –35 °C, freezing the tissue to a suitable hardness. The operator attaches the frozen block to a chuck with embedding medium and sections it with a disposable blade held at a fixed angle, producing sections typically 1 to 100 µm thick. Sections adhere to room-temperature slides and are fixed immediately in alcohol or acetone. Anti-roll plates and brush techniques guide ribbons free of curling. Because the whole cutting zone stays cold, tissue morphology is preserved without paraffin infiltration, and total turnaround from specimen to stained slide can be under 20 minutes.
Which Cryostats variants are available?
- Clinical Cryostat — A clinical cryostat is optimised for rapid intraoperative frozen sections, with fast cool-down, a stable chamber near –20 °C and simple controls.
- Research Cryostat — A research cryostat offers a wide temperature range for both chamber and specimen, programmable defrost and flexible cutting parameters.
- Motorized Cryostat — A motorized cryostat drives the cutting stroke with a motor inside the cold chamber, reducing operator strain and improving section consistency.
- Cryostat with Independent Specimen Cooling — A cryostat with independent specimen cooling controls the specimen stage temperature separately from the chamber.
- Cryostat with Vacuum Section Transfer System — A cryostat with a vacuum section transfer system lifts and deposits cut sections onto slides or grids without manual handling.
How do I choose the right variant?
Choose a cryostat by the work it must support. Clinical laboratories doing intraoperative frozen sections need fast cool-down, a stable chamber near –20 °C, reliable blade cooling and often UV sterilisation for contamination control. Research and immunohistochemistry laboratories value accurate independent specimen cooling, wide temperature range to –35 °С and a motorised or ergonomic cutting system for repetitive work. Confirm chamber and specimen temperature ranges, cool-down time, defrost cycle, section thickness range, blade type and whether the cutting area can be cleaned with the chamber at working temperature. Also check section transfer options and the footprint of the lab bench.
Where are Cryostats used?
Cryostats are specified in intraoperative frozen sections, immunofluorescence on fresh tissue, enzyme histochemistry, research tissue banking and mohs micrographic surgery.
Which standards and certifications apply?
Work with Cryostats is commonly governed by IEC 61010-1, IEC 61010-2-101, IEC 61326-1, ISO 15189 and ISO 13485. Instrument certifications such as CE marking are confirmed per configuration and never assumed.
What are the key considerations before purchase?
Place the cryostat in a room kept below 25 °C with good ventilation, because condensers reject significant heat. Allow several hours for initial cool-down, then verify chamber and specimen temperatures against a calibrated thermometer. Defrost and clean the chamber on schedule; residual cryo-embedding medium degrades section quality. Use anti-roll plates and change blades often. Monitor for frost build-up, compressor noise and door seal condition, and service annually. Maintain temperature logs, cleaning records and staff training, since these documents support accreditation of frozen section services.
