US Patent 8931837 Thoracic back support

A thoracic back support sits vertically against the back portion of a chair/seat in which a force is transmitted through the thoracic area of the spine of a user. The thoracic back support has an interior resilient substrate that is divided by a shallow groove that extends from the lower cervical spine to the upper lumbar spine. The groove helps to reduce any stress over the spinous processes as the individual leans back against the thoracic back support. When the resilient substrate is compressed, a force is primarily directed into the soft tissue areas adjacent to the spine which allows for the thoracic spine to move into a maximally neutral position.