Topic 2.3
Modern cryopreservation procedures
Most people treat cryopreservation as a binary choice: sign up or don't. But execution quality matters enormously, and you can't evaluate quality without understanding the operational constraints. This topic exists because the physics and biology don't care about your preferences. Ischemic damage accumulates on a fixed timeline, perfusion requires invasive surgery, and cryogenic transport can be challenging. The goal is to make you technically literate enough that "cryopreservation" stops being an abstract concept and becomes a set of concrete procedures you can reason about and evaluate.
First response (Standby & Stabilization)What happens after legal death: standby, cooling, cardiopulmonary support, medicines, measurement and the handoff to cryoprotective perfusion.Surgical procedure (perfusion & cryoprotection)How vascular access, blood washout and graded cryoprotectant perfusion balance ice suppression against toxicity, osmotic stress and uneven distribution.Logistics (Red tape & transportation)Tomorrow.bio and local funeral partners handle the paperwork, permits and transport to Switzerland. Once documents are complete, ground and air transfer are established logistics rather than a burden for the member.Biostasis quality check proceduresCryopreservation quality requires complementary evidence: case timing, perfusion telemetry, standardized whole-body CT, electron microscopy of consented neural samples, controlled cooldown data and auditable long-term storage records.Cooldown to cryogenic temperaturesTomorrow.bio uses computer-controlled cooling, multiple internal thermocouples and a staged protocol: rapid descent near the glass transition, stress-relieving annealing, then approximately 1°C per hour to -196°C.How vitrification procedures developed over timeVitrification developed through linked advances in cryoprotectant chemistry, stepwise perfusion, ice control, thermal engineering, organ recovery, volumetric rewarming and direct structural measurement.Long-term storage facilityEBF’s Rafz facility combines passive liquid-nitrogen storage with controlled cooldown, cryogenic CT, research infrastructure, separate patient funding, Swiss foundation governance and auditable long-term operations.Classic Cryogenic Storage SystemHow passive liquid-nitrogen storage combines vacuum-insulated dewars, weekly replenishment, continuous monitoring, redundant automated refilling, remote supervision and human response.Modern Cryogenic Storage System (ITS)Tomorrow.bio has received the world's first human-sized ITS dewar. It is now undergoing multi-month testing of thermal performance, nitrogen consumption and failure behaviour before patient use.Evaluating ischemic exposure in cryonics (S-MIX metric)How S-MIX converts a time, temperature and support history into estimated normothermic-equivalent ischaemic exposure, including its calculation, assumptions, uses and limitations.