Hospital Equipment Fabrication
A hospital cart is a structure that has to do two jobs at once: carry a load through a corridor for ten years, and be wiped down fifty times a week by someone in a hurry. Those two jobs fight each other. The stiffening that survives a 150 kg load across a 900 mm span is usually exactly what creates the crevice that disinfectant never reaches. Most of the useful design decisions on a medical trolley happen at drawing review, not in the factory.
This page covers what we have learned building procedure carts, instrument trolleys, dressing trolleys, equipment stands and mobile frames for medical device makers and hospital suppliers. It is written for the people who own the drawing and the specification.
Load, deflection and what the drawing has to tell us
A trolley frame looks trivial and is not. A 900 mm span carrying 150 kg is a beam problem, and the deflection at mid-span is what the user feels when they push it. Three things on the drawing determine whether the frame behaves:
- Gauge and section — whether the leg is a tube, a folded channel or a formed angle, and how thick the wall is
- Where the load path closes — a frame that is stiff at the top and floppy at the base is worse than one that is uniformly mediocre, because the top shelf looks fine in the photograph
- How the legs meet the top — a continuous weld at the joint transfers moment; a bolted bracket transfers force but allows rotation
Typical sections we build from
| Cart type | Typical frame | Loaded deflection we design around |
|---|---|---|
| Instrument and dressing trolleys, light duty | 304 stainless or CR steel tube, 25–32 mm | Under 3 mm at mid-span |
| Procedure carts with drawer banks | CR steel formed channel, 1.5–2.0 mm | Under 2 mm with the frame closed |
| Equipment stands and mobile frames | RHS or formed channel, 2.0–3.0 mm | Under 2 mm at full span |
| Bariatric and patient transfer equipment | RHS, thicker wall, gusseted joints | Designed against the stated load case, not a standard |
These are the shapes and ranges we normally work in, not a load rating for your product. We do not put a safe working load on a nameplate, because the rating depends on how you welded it, what you welded it with and what the customer puts on the shelf.
Cleanability is decided at the bend and weld stage
This is the part that gets missed. A surface that looks seamless in a photograph has a corner radius, and the corner radius has a radius, and the disinfectant sits in it. Cleanability is therefore a geometry specification, and it has to be written as one.
- Hemmed or flanged edges rather than a sheared edge that is only painted. Paint on a sharp edge fails first, and the failure shows as rust.
- Welds dressed flush before finishing, not left proud and coated over. A proud weld is a crevice you cannot clean and a fatigue point in a moving frame.
- No blind pockets in the tray or drawer body. If water and disinfectant can pool, it will pool.
- Welded stainless in the right sequence. Use the jig you would use for anything else: fixture the frame, weld the structure, then weld the skins and dress the seams.
Stainless or powder coated steel
| 304 stainless | Powder coated CR steel | |
|---|---|---|
| Corrosion in a wet environment | Excellent | Good, provided edges and welds are sealed |
| Appearance after years of wiping | Brushed grain holds up well | Scratches show; recoating is possible but costly |
| Cost and tooling | Higher material cost, similar tooling | Lower material cost, standard colours, no tooling on colour |
| Where it wins | Washdown rooms, theatres, corrosive atmospheres | General wards, corridors, equipment rooms |
Where the buyer is a hospital supply chain rather than a device OEM, powder coated steel is usually the answer: it looks better new, it comes in any RAL, and there is no tooling cost for a colour change. We are happy to build either, and we will say which one we think fits.
Frames, castors and the parts we do not make
The frame is metalwork and it is ours. Castors, bearings, drawer runners, latches, gas struts and locks are supplied by you or by a vendor you nominate, and we install them to your print.
The thing worth getting right early is the castor plate and its fixing. It is the highest-load point on the whole product and it is usually drawn as a two-line detail. We will tell you if the plate needs to be thicker than the sheet you have specified, and we will tell you how we intend to fix it — welded, riveted or bolted — because that decision affects the load rating more than the plate thickness does.
| Component | Source |
|---|---|
| Tubular and sheet frame, trays, drawer bodies, handles, panels | Made in Ningbo, from your drawing |
| Drawer runners, latches, locks, gas struts | Customer nominated |
| Castors and wheels | Customer nominated, installed to your print |
| Decorative covers, logos, labels | Customer supplied, fitted by us |
| Powder coating | Audited partner lines that we specify and inspect |
What we run, and what we do not
- 3 laser cutters — 2× 3,000 W and 1× 6,000 W. Mild steel to 18 mm, stainless to 15 mm, aluminium to 10 mm
- 4 CNC press brakes — 250 tonnes each, 3,000 mm bed, so a full-length cart side or tray is formed in one setup rather than split and welded
- 10 welding stations in the same building
- Powder coating is not ours. It runs on audited partner lines. We set the pre-treatment and film build, approve a drawdown panel before the batch runs, and measure film thickness on receipt
- No coordinate measuring machine. We verify with height gauges and coating thickness gauges and we will tell you at quotation stage if your drawing asks for something tighter than that
Lead times
| Stage | Typical |
|---|---|
| Simple samples | 3–7 days |
| Complex first article | 15–20 days |
| Production batch | 25–35 days |
| Tooling — simple | 7–15 days |
| Tooling — complex | 30–45 days |
Questions buyers ask about medical carts
What is the minimum order?
One is fine for a sample, and it is genuinely useful to buy one. Small runs of a standard part are not where a factory is efficient, so below roughly 25 units we will usually steer you to a standard construction rather than a fully customised one, and we will say so in the quote rather than pricing it as though it were a batch.
Can you build from our drawing, or do you need your own?
Yours is what we want. Send STEP and a 2D PDF. We will return a manufacturing view with the bend sequence, weld map and any place where we think the drawing fights itself — usually a corner radius that cannot be made, or a bracket that lands where the weld would be.
How do you keep the frame from twisting?
By planning the weld sequence the same way we plan a cabinet. The frame is fixtured square, the structure closes first, and the skins go on afterwards. If the load path is closed before the visible welds are made, the part comes off the jig flat. We check flatness with a height gauge against the datum you nominate.
Do you coat it?
We arrange the coating, we do not run the line. Powder coating happens on audited partner lines that we specify and inspect: pre-treatment set by us, a drawdown panel approved before the batch, film thickness measured on receipt. If your specification names a two-component wet system we tell you at quotation stage and route it to a controlled applicator instead of quietly substituting powder.
Can you supply the castors?
We install them, we do not make them. Nominate the castor, the swivel offset and the plate fixing, and we will build the frame to suit it — and tell you if the plate as drawn is thinner than the load wants.
Do you hold an ISO 9001 certificate?
No. Our quality system is documented to ISO 9001 and we can put two third-party audit references under NDA — TUV Rheinland MIC-ASI243729 and Bureau Veritas MIC-ASR263630. If your tender requires a certificate rather than an audit report, better to know now.
Send a drawing, or a photo and a dimension
Send STEP and a 2D PDF if you have them; a photograph with the section size and the load is enough for us to tell you whether we are the right supplier. Either way you get a straight answer in one working day.