The invention relates to a safety brace (100) for limiting the mobility of a patient lying in bed, or for positioning a patient on a bed with a harness (59) to which a body belt (64), which goes around the body of the patient in the stomach area, is movably connected. In order to improve the safety brace (100) in such a way that a patient cannot remove the upper leg sleeve of the safety brace (100) without assistance and without greatly constricting the patient, the invention suggests that the safety brace (100) is supplemented with at least one material surface (11), particularly a rectangular material surface, which extends transversally across the bed, wherein the surface (11) facilitates the secure attachment of attachment elements such as a shoulder harness and upper leg harness and/or the secure attachment of straps which facilitate the removable attachment of attachment elements such as a shoulder harness and upper leg harness.
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