core, pro, pro+ Integrated, and max Mattresses
Chapter 3: Theory of Operation
3 - 16 Centrella® Smart+ Bed Service Manual (193588 REV 12)
powered dynamic air mattress that supports the patient and provides therapeutic benefit as well as
patient comfort.
The pro mattress supports the patient via one layer of viscoelastic foam, one layer of conventional foam,
self-adjusting foam filled bladders in the head and seat sections, and a foam foot section. The foam core
section provides support for the patient's head, shoulders, back, seat, and thigh sections. This section
aids in patient comfort as well as reducing interface pressure
The stiff side bolsters of the foam crib provide support to the patient as the patient gets in and out of
bed, as well as side sitting.
The foam filled support bladder assembly contains eight bladders (foam bladders). The assembly
provides support for the patient's head, back, seat, and thigh sections. There are two types of foam
configurations inside the foam bladders which are different indention load deflections (ILDs) to help
with patient comfort and reduce interface pressure. Both of the foam bladder configurations are made
of two layers of conventional foam. The foam bladders help to reduce interface pressure and make sure
the patient does not bottom out.
A port is at each end of the bladder. On one end of the bladder there is a check valve in the port. This
check valve opens and closes when pressure is applied to it. This makes the bladder assembly self-
adjusting. On the other end of the bladder, the tubing assembly is connected to the port. At the end of
the tubing assembly there is a check valve that lets air release from the bladders. The tubing assembly is
routed in a straight line and connects all of the bladders together.
PRO+ INTEGRATED MATTRESS
The pro+ mattress provides these two primary therapeutic mattress functions:
• Pressure redistribution
•MCM
The mattress uses foams of different densities with various constructions and zones to optimize patient
support and comfort while distributing interface pressure (patient weight) over as much patient contact
area as possible. The mattress provides self-adjusting technology to achieve inner core pressure
redistribution when a patient is on/off the mattress.
The mattress also provides an optional MCM® feature that helps decrease localized heat and moisture
buildup that occurs between the patient and the mattress.
The mattress has an optional x-ray sleeve that provides an area of the mattress that may be opened for
the temporary placement of an x-ray cassette underneath the patient.
The MCM® feature is turned off and on through the GCI. You can also set MCM to always On (this hides
the MCM menu control; do this per facility request only).
The MCM indicator on the GCI lets you know the operational status—
• MCM is On and operating correctly—the indicator is green.
• MCM is Off—the indicator is not lit and it has an “X.”
• MCM has experienced an error—the wrench indicator is on and an error screen shows.
The mattress assembly includes these major components:
• Support mattress
• Pneumatics System
• Control and indication of the MCM status
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