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Mayo Stand Covers and Trolley Covers Explained
Mayo stand covers slide over the small instrument tray; trolley covers cover the back table. Here is how they differ and how to size reusable covers to your own equipment.
A Mayo stand cover is a fitted fabric sleeve that slides over the tray and arm of a Mayo stand, the small adjustable instrument table that sits over or beside the patient during surgery. A trolley cover, sometimes called a back table cover, covers the larger instrument trolley where the scrub team lays out the full set. Both create a covered working surface for instruments; how they are opened, placed and handled is set by your theatre's aseptic technique.
This post explains the difference between the two, the design features that matter, and how to size them to the equipment you actually have.
The Mayo stand and the instrument trolley
Most operating theatres use two kinds of instrument surface:
- The Mayo stand. A small, height-adjustable tray on a single arm and base, positioned over the patient or close to the operating table. The scrub practitioner keeps the instruments in immediate use here.
- The instrument trolley or back table. A larger, flat-topped trolley, usually behind or beside the scrub practitioner, holding the full instrument set, supplies and items not in immediate use.
Because the two surfaces are shaped differently and used differently, their covers are made differently.
How the covers differ
| Feature | Mayo stand cover | Trolley cover |
|---|---|---|
| Shape | Closed-end sleeve or bag that slides over the tray and arm | Large flat sheet, sometimes with a fitted or reinforced top area |
| Fitting | Pulled on from the open end; often folded so it can be applied without touching the outer surface | Opened and laid over the trolley, hanging down the sides |
| Typical size drivers | Tray length and width, arm length | Trolley top dimensions and drop over the sides |
| Reinforcement | Sometimes a double layer over the tray area | Sometimes a reinforced top panel where instruments rest |
| Reusable fabric | Woven cotton or poly-cotton | Woven cotton or poly-cotton |
Mayo stand covers
A Mayo cover is essentially a long fabric bag with one closed end. It is pulled over the tray, covering the tray surface and part or all of the arm. Many designs include a folded cuff at the open end so that the person applying it can keep their gloved hands protected inside the fold as they slide it on. Whether your team uses that technique, and exactly how, is part of your theatre procedures.
Key design points are:
- Length: enough to cover the tray and the part of the arm your policy requires
- Width: enough to slide over the tray without dragging, but not so loose that it bunches
- Top reinforcement: some designs add a second layer over the tray where instruments are placed
Trolley covers
A trolley cover is a large sheet that covers the top of the trolley and hangs down the sides. On a reusable cover, the key decisions are the overall dimensions and whether a reinforced panel is needed on the top. The drop over the sides should be agreed with your theatre team.
Sizing covers to your equipment
The most common problem with covers is that they do not fit the stands and trolleys in use. Theatres often have several models of trolley, bought at different times, and Mayo stands vary in tray size.
A simple sizing process:
- List the equipment. Record each Mayo stand and trolley model in every theatre, with tray or top dimensions.
- Group similar sizes. Most facilities can reduce the list to two or three cover sizes.
- Agree coverage with the theatre team. For trolleys, agree the drop over the sides; for Mayo stands, agree how much of the arm is covered.
- Allow for shrinkage. Woven cotton and poly-cotton can shrink with laundering. Ask the supplier how the cut size accounts for this, and confirm by putting a sample through your laundry.
- Mark the size. Label each cover with its size so it is matched to the right equipment in packs.
If you are also reviewing drape sizes at the same time, our OT drape sizes post uses a similar approach.
Fabric and construction
Reusable Mayo stand and trolley covers are usually made in the same woven fabric family as the theatre's drapes, so they launder and sterilise together. Points to cover in the specification:
- Fabric type and weight: cotton or poly-cotton woven, chosen for durability through repeated cycles
- Seams: the closed end of a Mayo cover takes strain each time it is pulled over the tray; seams should be secure and flat
- Hems: neat, secure hems reduce fraying and lint
- Colour: usually theatre green or blue; agree whether covers match the drapes or are distinguishable from them
- Marking: laundry marks and size labels placed where they will not interfere with the working surface
If a fabric is described as having barrier properties, ask for the documentation and have your infection-control team confirm whether it meets your requirements. Without that documentation, treat the cover as a reusable theatre textile rather than a certified barrier product.
Covers in procedure packs
Mayo and trolley covers are usually included in procedure linen packs alongside drapes, gowns and towels. How they are folded and in which order they sit in the pack is decided by your CSSD and theatre team, so that items can be opened in the right sequence. Getting cover sizes right makes pack assembly simpler because there are fewer variants to manage. Our post on OT procedure linen packs covers pack assembly in more detail.
Inspection and replacement
Covers go through the same cycle as other reusable theatre textiles: use, laundry, inspection, folding, packing and sterilisation. Common signs of wear include:
- thinning or holes on the tray or trolley top, where instruments rest
- seam failure at the closed end of Mayo covers
- frayed hems
- shrinkage that means covers no longer fit the equipment
Include covers in your inspection routine and follow your CSSD and infection-control policy on what is withdrawn.
A short checklist
- Equipment list with Mayo tray and trolley top dimensions
- Agreed number of cover sizes
- Agreed coverage of Mayo arm and trolley side drop
- Fabric type, colour and any reinforcement specified
- Seam and hem construction checked on the sample
- Shrinkage checked after laundering the sample
- Size labels and laundry marking agreed
- Covers included in procedure pack lists and inspection routines
How these fit with other drapes
Mayo stand and trolley covers are one part of the theatre textile set. For an overview of the other items, from plain and fenestrated drapes to specialist drapes, see types of surgical drapes.
MISHAREN makes reusable Mayo stand covers and trolley covers alongside surgeon gowns and drapes, in cotton or poly-cotton woven fabrics, cut to your equipment dimensions, with laundry marking.
To request a quotation, send your equipment sizes through the contact page or see our OT gowns and drapes range. Shipping time from our production unit in Kerala is included in the lead time confirmed in the quotation.