IEC 60601-2-52 -figureBB.2 Medical Bed Tester -Impactor

BB.2.2 The effect of impacts to the MATTRESS SUPPORT PLATFORM
The MEDICAL BED shall be able to withstand the effect of impacts to the MATTRESS SUPPORT
PLATFORM being applied during NORMAL USE .
Compliance is checked by the following test:
Place the mattress, as specified by the MANUFACTURER , onto the MATTRESS SUPPORT
PLATFORM , in a position in which moving element are free of supporting elements and their
inclination is less than 7° in relation to horizontal, and if height-adjustable, the MATTRESS
SUPPORT PLATFORM shall be placed in the middle of the possible range of the adjustment.
From a height of 180 mm above the mattress, drop the impactor (see Figure BB.2) onto the
MEDICAL BED 20 times onto each of the locations marked “B” in Figure BB.1. The impactor
shall be allowed to fall freely, but guides may be used to help insure that the impacts occur as
close as is possible to the recommended locations.
After application of the load, no elements of the MEDICAL BED shall become loose, fractured or
present any HAZARD

The impactor body is approximately 200 mm in diameter and is separated from the striking
surface by helical compression springs. The body is free to move on a line perpendicular to
the plane of the central area of the striking surface. The total mass of the assembly shall be
25 kg ± 0,1 kg and the body and its associated parts (minus the springs) shall have a mass of
1 7 kg ± 0,1 kg.
The combined spring rate (for the system) shall be 6,9 N/mm ± 1 N/mm and the total friction
resistance of the moving parts is between 0,25 N and 0,45 N. When the spring system is
compressed to a load of 1 040 N ± 5 N, the remaining compression distance shall be 60 mm
minimum.
The striking surface shall be a rigid circular object, (200 ± 5) mm in diameter, the face of
which has a convex spherical curvature of 300 mm radius with a 1 2 mm front edge radius.