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Zone 1 — Within the Rails
This is any open space within the perimeter of the rail. Openings in the rail
should be small enough to prevent the head from entering. A loosened bar or
rail can change the size of the space. The HBSW and IEC recommend that the
space be less than 120 mm (4-¾ inches), representing head breadth.
Zone 2 — Under the Rail, Between the Rail Supports or Next to
a Single Rail Support
This space is the gap under the rail between a mattress compressed by the
weight of a patient's head and the bottom edge of the rail at a location between
the rail supports, or next to a single rail support. If there is a single rail support,
entrapment in Zone 2 can occur anywhere along the bottom length of the rail
beyond the support, up to the end of the rail. (Entrapment at the end of the rail
is explained in Zone 4.) Factors to consider are the mattress compressibility 17
which may change over time due to wear, the lateral shift of the mattress or rail,
and any degree of play from loosened rails or rail supports. A restless patient
may enlarge the space by compressing the mattress beyond the specified
dimensional limit. This space may also change with different rail height positions
and as the head or foot sections of the bed are raised and lowered. The space
may increase, decrease, become less accessible, or disappear entirely. In some
positions, the potential for entrapment in this zone may still exist when the
deck is articulated. Preventing the head from entering under the rail would most
likely prevent neck entrapment in this space. FDA recommends that this space
be small enough to prevent head entrapment, less than 120 mm (4 ¾ inches).
IEC recommends the same dimensions but measures the space without the
mattress in place.
User Manual & Entrapment Guide
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