  Dropped Head Syndrome (DHS) causes a passively correctable neck deformation.
Currently, there is no wearable orthopedic neck brace to fulfill the needs of
persons suffering from DHS. Related works have made progress in this area by
creating mobile neck braces that provide head support to mitigate deformation
while permitting neck mobility, which enhances user-perceived comfort and
quality of life. Specifically, passive designs show great potential for fully
functional devices in the short term due to their inherent simplicity and
compactness, although achieving suitable support presents some challenges. This
work introduces a novel compliant mechanism that provides non-restrictive
adjustable support for the neck's anterior and posterior flexion movements
while enabling its unconstrained free rotation. The results from the
experiments on non-affected persons suggest that the device provides the
proposed adjustable support that unloads the muscle groups involved in
supporting the head without overloading the antagonist muscle groups.
Simultaneously, it was verified that the free rotation is achieved regardless
of the stiffness configuration of the device.
