This present invention decreases the risks of pressure ulcer formation bysteadilyand smoothly changing the support points of the body to vary the effectivearea ofsupport of bony protrusions from the body on the skin and compressing it tothebed, which causes the reduction, as close to zero as possible, of the amountoftime pressure is exerted by the weight of the body on the bed and restrictedareasof support, preventing that the areas of risk of low blood flood by the weightof thebody, remain in ischemia and, therefore, with increased blood flow to theseparts ofthe body.The purpose of this present invention is designed to slowly, steadily, andsmoothlychange the body support points to vary the effective area of body support onthebed with slow, constant oscillations, in the directions of the width andlength of themattress support and having two sets of drive systems (DS) attached to thechassis (4) intended to support all components, such as the electric motor(7),driven by a power drive (PWM) in the control panel (PC), said electric motor(7)being fitted with gear (8) connected to another gear (9) and a minimum pitch(10),which drives the worm thread vertical shaft (11) intended to move the flat orarchedmattress support (2) vertically and the coupling (13) that carries out theverticalcoupling of the tip (12) of the vertical shaft (11), which allows adjustmentof thecoupling (13) and tip (12) of the vertical shaft (11) to the lateral movementsbetween the tip (12) of the vertical shaft (11) and the flat or archedmattresssupport (2) resulting from transversal oscillations the rotation shaft (5A)support(5), which couples with the cylindrical shaft (3) attached to the archedmattresssupport (2), the equipments chassis (4), and the noise and vibrationabsorbingcushions (6) as well as the support (14) of hoods (15) and (16) that surroundandprotect the vertical screw shaft (11).
