How to specify treatment chairs for a dialysis or chemotherapy unit: frame material, motor count, weighing and battery options, floor layout, and the compliance documents a tender package has to carry.
Chronic kidney disease is rising in Bangladesh and dialysis capacity has not kept pace. New units are opening in private hospitals, in medical college hospitals and as standalone centres. The chair is the piece of furniture a dialysis patient occupies for four hours at a time, three times a week, for years. It deserves more thought than it usually receives, and it is almost always the line in the tender that gets decided on price alone.
A dialysis chair is not a recliner with a medical label. It has a narrow and specific clinical job:
Dialysis units are wet environments. Between spilled dialysate, saline and repeated disinfection, a chair frame takes chemical punishment that ordinary ward furniture never sees. This is why some manufacturers build the underframe from composite plastic that is self-supporting without steel components, removing the corrosion risk at its source rather than coating over it. If you are comparing chairs on price alone, ask what the frame is made of and how it behaves after five years of chlorine-based disinfection. The photographs in the catalogue all look the same at year zero.
Upholstery is the second half of the same question. Blood resistant artificial leather that also resists disinfectants and urine is a specification you can write into a tender, and exchangeable upholstery is worth asking about, because reupholstering in place is far cheaper than replacing a chair whose frame is still sound.
The number of independent motors determines how precisely a patient can be positioned. A four-motor chair drives backrest, seat tilt, legrest and seat height separately, which allows a clinically correct position rather than a compromise between two linked movements. Chairs in this class typically carry a maximum patient load in the region of 200 kg, which matters more than it once did.
Below that, the range steps down in a predictable way, and knowing the steps stops a department paying for movement it will never use or, more often, buying a chair that cannot reach the position the protocol requires. A single-motor chair moves backrest and legrest together on one actuator, with a fixed seat height around 55 cm and a maximum load nearer 180 kg. A two-motor chair separates backrest and legrest, usually at a fixed 65 cm seat height, with seat tilt and footrest as options. Three motors add seat tilt as standard. Four motors add powered seat height, typically adjustable from around 55 cm to 77 cm, which is the function nursing staff notice most: a low entry position for the patient and a comfortable working height for the nurse during treatment.
One specification worth naming explicitly in the tender is the Trendelenburg angle. A chair that reaches a true horizontal bed position and a real head-down tilt of at least 12 degrees in compliance with EN 60601-2-52 is doing something different from a chair that simply reclines a long way, and only one of those is useful when a patient's pressure drops in the third hour.
| Feature | What it does | Worth it when |
|---|---|---|
| Integrated patient scale | Weighs the patient in the chair, with an approved accuracy of 100 g up to a 200 kg load | Fluid removal is calculated from pre and post-dialysis weight. Removes two transfers per session and speeds up turnaround. |
| Weight forwarding | Touchscreen patient terminal at the chair, with optional transfer to central systems over medical Wi-Fi | The unit is running an electronic record and manual transcription of dry weights is a known error source. |
| Battery operation | A 24 V back-up supply, typically 1.2 Ah with a 2.4 Ah option, that keeps the chair working during a mains failure | Bangladesh load-shedding is a live risk. A patient mid-session cannot wait for the generator to catch. |
| Trendelenburg | Rapid head-down tilt from a dedicated control, usually a marked button on the handset | Always. Intra-dialytic hypotension is routine, not exceptional. |
| Transport variant | Chair doubles as an indoor patient transport chair, with a push bar, a fifth wheel for tight turns and locking twin-wheel castors | Units where patients arrive by wheelchair and transfer twice per visit. |
| Compact footprint | A slimmer chair aimed at shorter treatments, up to about two hours | Chemotherapy and infusion bays where floor area is the binding constraint. Digiterm state the smaller frame saves at least 15 per cent of useful floorspace. |
The same treatment chair platform generally serves dialysis, chemotherapy, plasma collection, plasmapheresis, infusion therapy, blood donation, transcranial magnetic stimulation and one-day surgery recovery. For a hospital this is a procurement advantage: standardising on one chair family across departments simplifies spares, training and service, and usually improves the commercial terms. Specify the variants you need rather than treating each department as a separate purchase, and write the whole requirement into one tender even where the departments hold separate budgets.
Chair choice and floor layout are linked. A few practical points that are much easier to fix on a drawing than after commissioning:
A dialysis unit fails on water long before it fails on furniture. Water treatment, the ring main that distributes it, disinfection of that loop, and drainage capacity all sit outside the chair tender and all have longer lead times. Sizing the treatment plant against the number of stations you intend to run in five years, rather than the number you are commissioning now, is the cheapest decision in the whole project and the one most often deferred.
The same applies to the electrical design. Dialysis machines, chairs, air conditioning and lighting on one distribution board with no priority separation means an outage takes the whole floor. Split the load so that treatment continues on the generator even when comfort cooling does not.
For imported treatment chairs, ask for EU Medical Device Regulation compliance documentation and the manufacturer's quality management certification. For government projects, the supplier should provide manufacturer authorisation, compliant technical specifications and catalogues suitable for e-GP tender submission. Vvon supplies all of these as part of a tender package.
Two things to check on any bid that comes in noticeably cheap. First, whether the quoted chair is the model in the catalogue or a stripped variant with the same family name and fewer motors. Second, what the spares position is: actuators, handsets and control boxes are the parts that fail, and a chair whose control box has a six-month lead time is a chair out of service for half a year.