Ripple Mattress for Bedsores in Kenya

Published 1 June 2026Last updated 21 August 2026

Why pressure causes a sore in the first place

Skin and the fat and muscle under it are fed by small blood vessels. When a bony point such as the sacrum, a heel or a hip presses that tissue against a mattress, those vessels are squeezed shut. Tissue starved of blood for long enough begins to die, and the damage often starts in the deeper layers before anything is visible on the surface. This is why a sore can appear suddenly as a dark patch or a blister when the skin looked normal the day before.

The time involved is shorter than most families expect. Damage can begin within a couple of hours of continuous pressure in a frail or poorly nourished patient. It is faster still where the skin is damp from sweat or urine, or where the patient has been dragged up the bed rather than lifted, because friction and shear tear the tissue layers against each other while pressure is already reducing blood flow.

What the alternating cycle actually does

A ripple mattress is an overlay laid on top of the existing bed mattress. It is built from air cells arranged in two interleaved sets, odd and even, connected by tubes to an external pump. The pump inflates one set while letting the other deflate, then reverses. Every point on the patient's body therefore alternates between bearing load and bearing almost none, on a cycle of roughly ten to twelve minutes depending on the pump.

That interruption is the whole mechanism. Blood returns to the tissue during the low phase, which is what prevents the ischaemic damage that produces a sore. It is a different principle from a thick foam or memory foam mattress, which spreads load over a wider area but never removes it. Spreading pressure helps a mobile patient who shifts position in their sleep. It does not help an immobile patient who does not move at all, and that is the patient a ripple mattress is built for.

Stages, and what the mattress can do at each

On darker skin, stage 1 is not reliably visible as redness. Judge by texture, temperature and hardness instead, and by whether the patient reports pain or burning at a particular spot. An area that feels warmer, firmer or boggier than the skin around it is damaged whatever colour it looks. Staging language follows the NPIAP pressure injury stages.

Choosing a set for a patient who already has sores

Two things decide whether the set will work for your patient: cell type and weight rating.

Weight rating matters more than the price gap suggests. If the patient is heavier than the rating, they compress the cells fully and rest on the base mattress underneath. The pump keeps cycling and nothing reaches the skin. This is the single most common reason a family reports that the mattress "did not work". Check the rating against the patient's actual weight before ordering, not after.

Setting it up so it works

• Overlay, not replacement. It goes on top of the existing mattress, secured with the flaps at head and foot. It fits a standard Kenyan bed and a hospital bed alike.
• One sheet only, laid loose. Every extra layer between patient and cells reduces the pressure relief. Tucking the sheet tight does the same thing by flattening the cells.
• Check the tubes are not kinked or trapped under the bed frame. A pinched tube means one bank of cells never inflates, and that half of the mattress does nothing.
• Hang the pump on the footboard or set it on a firm surface with the air intake clear. It runs continuously and needs airflow.
• No incontinence sheet directly over the cells. Use a thin breathable protector under the sheet, not a thick plastic one on top.
• Float the heels. A pillow under the calves lifts the heels off the surface entirely. Heels carry very high pressure over a tiny area and are the one site where even a good mattress often is not enough on its own.

What it does not replace

A ripple mattress reduces how often a patient needs turning and how urgent each turn is. It does not remove the need. Reposition at least twice a day, and use the thirty degree tilt with pillows behind the back rather than rolling the patient fully onto a hip. Keep the head of the bed as low as is clinically acceptable, because raising it above thirty degrees lets the body slide down and shears the tissue over the sacrum.

It also does not substitute for wound care or for nutrition. An open sore needs assessment and dressing by a nurse. A patient who is not eating enough protein will not heal a sore no matter what they are lying on, and will develop new ones under pressure a well nourished patient would tolerate. If the patient is refusing food or losing weight, raise it with their clinician rather than waiting.

Call a nurse or doctor if the skin is broken, if there is discharge, bad smell, surrounding heat or swelling, if the patient develops a fever, or if an existing sore is getting larger despite good care. A stage 2 sore treated early usually closes. The same sore left two more weeks may take months.

Price and what is in the box

The complete set from Ripple Mattresses Kenya is KSh 6,000, reduced from KSh 8,500. That is the mattress, the pump, air tubes and connectors, a user guide, setup support by phone and a 6-month warranty on the pump. It is rated to 135kg. Comparable bubble sets in Nairobi run from about KSh 5,000 to KSh 7,500, so check what is included before comparing prices, because several sellers quote the mattress alone and charge separately for the pump.

Delivery inside Nairobi is same day and you pay after the rider arrives and you have inspected the set and confirmed it inflates. Outside Nairobi we ship countrywide by courier once the order is confirmed by phone, including Mombasa, Kisumu, Nakuru, Eldoret, Nyeri, Meru, Kisii and Thika. The shop is on Ronald Ngala Street, Poster Building, 4th Floor, Nairobi CBD, and you are welcome to come and see the set running before you buy.

Common questions