Trolley materials and structure
Most trolleys used within the ward areas are designed for relatively light loads and made of stainless steel tube and most of them work reasonably well.
Many trolleys used only within the service areas are made to achieve economies of scale and are often too large and made from angle iron or other heavy steel sections, and this often accounts for why many injuries to workers occur in those places.
A rough rule of thumb is that the weight of a trolley should be about 25% of the load for which it is designed.
The design of the trolley from the beginning needs to take account of the users interface, i.e. how the user will put his or her hands onto the trolley and how they will use it. This remembrance of the user right from the beginning will often change the materials used so they are not sharp, or don't rust, or the shape of the materials so that they do not have sharp corners or become rough, or the design so that the trolley does not become too heavy or distortion prone from being too lightly built.
All good design is a compromise, but design that leaves the user out of the equation is simply bad design.
Increasingly, as hospitals work to avoid cross ward infection, trolleys are subject to trolley washing. Both trolley and castor materials need to recognise the detergents and hot water and (often) hot air drying involved in this. And, even when the materials are made non-corroding it will be necessary to frequently replace the grease in the castor head and wheel bearings.
Castors only function well when they are securely mounted to a rigid frame so the swivel axis remains vertical. The adequate rigidity of actual mounting points has to be considered by the trolley manufacturer at the time of designing the trolley. Training material is available for proper fitting of castors. Matters such as tube diameter, tube wall thickness, length of leg extension, etc, are specified in the training material, and need to be given to the designer.
Carefully consider trolley materials and the construction of the trolley.
Special conditions of use, e.g. very hot or cold, or exposure to chemicals or the weather will require special materials or finishes.
Frame material and structure affect trolley weight, rigidity, durability resistance to corrosion, visibility through frame, noise, vibration, type and strength of castor mounting, and potential for cuts, scratches and other injuries. Consults the trolley and castor manufacturers about special requirements. Consider also hygiene and cleaning requirements.
If recommendations are not followed
If your conditions of use are severe it is best to trial a sample under actual use conditions.