Consumables are usually treated as a stock item. Order when they run low, reorder when they run out. That approach works until a straw format is selected which does not fit goblets and canes already purchased, at which point nothing is faulty, nothing is covered by warranty, and the tank furniture is simply bought again.

The Consumable Chain: Why It Runs Against the Purchase Order

Straw format determines which goblets are compatible. Goblet selection determines cane and canister layout. Canister layout determines the rack configuration and neck diameter required in a storage vessel.

Which places the vessel at the end of the chain. It is also the largest cost and the longest lead time, so it reaches procurement first, and that inversion produces most of the compatibility failures in cryogenic laboratories.

Every straw format in the laboratory should have a documented path to a specific canister position. Where that path cannot be written down, the organisation system is not designed, it is assumed.

Straws and Sealers: Compatibility Discovered Late

High security straws seal at both ends and keep the sample isolated from the liquid nitrogen throughout storage. The ASRM and SART Practice Committees, in Fertility and Sterility (2021;115:305-310), set out best practice for rapid cooling vitrification of oocytes and embryos, and the open against closed carrier question sits at the centre of it. The same committees, writing on cryostorage in Fertility and Sterility (2020;114:486-491), observe that liquid nitrogen is not sterile, which is the foundation of the closed system argument.

CBS High Security sperm straws are supplied in 0.3 ml and 0.5 ml and seal with the SYMS or SYMS III sealer. Embryo straws are 0.15 ml and 0.3 ml.

Sealing requires a matched sealer, and the sealer has to suit the straw. That is a compatibility link discovered late far more often than it should be. Plan one sealer per freezing station plus spares, because a single shared unit becomes a bottleneck on a busy day and a single point of failure on a bad one.

Standardising on fewer straw volumes costs nothing and removes an entire category of error, since every additional volume multiplies the goblet and visotube combinations the laboratory has to hold in stock.

Goblets and Visotubes: Reading Capacity Figures Properly

Goblets hold straws in groups on a cane, and their capacity depends on straw diameter rather than on any single number. CBS Daisy Goblets are listed at up to 540 0.25 ml straws, 240 0.5 ml straws or 168 high security straws.

Quoting the largest of those three figures is a familiar way to make a storage capacity look considerably better than it will be in practice. Read capacity against the format you actually use.

CBS Round Visotubes are rigid PETG tubes used as an alternative organisation format, available in diameters from 7.1 mm to 17.5 mm and compatible with 0.25 ml straws, 0.5 ml straws and CBS High Security straws. They are not interchangeable with goblets, and the choice between them changes how canes are loaded.

Canes and Sleeves: The Organising Unit Inside the Canister

Aluminium cryocanes are the standard organising unit within a canister. Aluminium is used because it tolerates repeated cycling to cryogenic temperature without embrittlement, resists corrosion, and remains light enough to lift one handed from a full canister.

Full size Cryocanes take five or six ampoules. Half Canes are shorter and take three. The two look similar in a catalogue and the distinction is worth confirming on an ordering sheet rather than after delivery.

Cryosleeves are PVC covers fitted over a loaded cane and supplied in packs of 100. They protect samples during handling and, more usefully in daily practice, they carry colour. In a store holding thousands of canes, colour coding is what separates retrieval from searching.

Cryovials: A Second Organisation System

Cryovials are the alternative format where sample volume makes a straw impractical, which covers most cell and tissue banking work. Internal and external thread designs behave differently in storage, and the choice interacts with your rack and box system rather than with canes and goblets at all.

A laboratory running both straws and vials is therefore running two organisation systems in parallel, and both need documenting. That is not a problem in itself, but an undocumented second system is where samples go missing.

Identification: What Has to Outlast the Staff

This category gets specified last and matters longest.

Since the Health and Care Act 2022 took effect on 1 July 2022, the Human Fertilisation and Embryology Authority confirms patients may store for up to 55 years with reconsent every ten years. Labelling therefore has to survive longer than any member of staff will be in post, together with at least one change of laboratory information system and possibly a relocation of the store.

Labels and printers must be rated for cryogenic exposure, because ordinary label stock lifts and ordinary ink fades. Colour coded tabs and cryomarkers do the equivalent job at cane level, and the storage accessories range covers both.

The reliable way to specify consumables is to settle the chain in order: straw or vial format, then sealer, then goblets or visotubes, then canes and sleeves, then the canister and rack system, and only then the vessel. If you send us the formats you already run, we will check compatibility across the whole chain before anything ships rather than after. Speak to Cryolab.