Device for supporting a seated person and method for adjusting, designing and/or manufacturing such a device

1. A device for supporting a back of a seated person, comprising a seat and a support for the lumbar-thoracic transition region, which is connected to the seat, the support for the lumbar-thoracic transition region being adapted to engage a lumbar-thoracic transition region of the back, an adjustable lumbar-sacral support being adapted to engage a lumbar-sacral region of the back, which is mounted at a location of a lower side of the support for the lumbar-thoracic transition region, wherein the support for the lumbar-thoracic transition region and seat can be adjusted for height with respect to each other and wherein the lumbar-sacral support is adjustable to a selected fixed position relative to the support for the lumbar-thoracic transition region during use.

2. A device according to claim 1 , wherein the lumbar-sacral support can be adjusted over a range which enables forming both a convex support and a concave support together with the support for the lumbar-thoracic transition region.

3. A device according to claim 2 , wherein an adjustable support is furthermore provided for the thoracic-cervical transition region, which support is mounted at the location of the upper side of the support for the lumbar-thoracic transition region.

4. A device according to claim 2 , wherein the lumbar-sacral support and/or the support for the thoracic-cervical transition region is/are pivoted to the support for the lumbar-thoracic transition region, being capable of pivoting movement about a substantially horizontal, imaginary axis.

5. A device according to claim 2 , wherein the angle that the seat builds with the horizontal is set so that the angle between the loaded seat and the loaded backrest is in the range from about 95° to about 115°.

6. A device according to claim 2 , wherein the support for the lumbar-thoracic transition region and the seat can be adjusted to the front and to the rear with respect to each other.

7. A device according to claim 2 , wherein the angle of the support for the lumbar-thoracic transition region is adjustable with respect to the seat and/or wherein the seat is adjustable relative to the horizontal.

8. A device according to claim 2 , wherein at least one of said supports is made of a flexible, low-stretch material that easily adapts to the body contour.

9. A device according to claim 1 , wherein an adjustable support is furthermore provided for the thoracic-cervical transition region, which support is mounted at the location of the upper side of the support for the lumbar-thoracic transition region.

10. A device according to claim 1 , wherein the lumbar-sacral support and/or the support for the thoracic-cervical transition region is/are pivoted to the support for the lumbar-thoracic transition region, being capable of pivoting movement about a substantially horizontal, imaginary axis.

11. A device according to claim 1 , wherein the support for the lumbar-thoracic transition region and the seat can be adjusted to the front and to the rear with respect to each other.

12. A device according to claim 1 , wherein the angle of the support for the lumbar-thoracic transition region is adjustable with respect to the seat and/or wherein the seat is adjustable relative to the horizontal.

13. A device according to claim 1 , wherein at least one of said supports is made of a flexible, low-stretch material that easily adapts to the body contour.

14. A device according to claim 1 , wherein at least one of said supports comprises a shell having an anatomic shape, which is lined with a foam-like material.

15. A device according to claim 1 , wherein the angle that the seat builds with the horizontal is set so that the angle between the loaded seat and the loaded backrest is in the range from about 95° to about 115°.

16. A method for adjusting, designing and/or manufacturing a device for supporting a seated person, comprising a seat, a support for the lumbar thoracic transition region, and a lumbar-sacral support, wherein said person sits down on the seat and engages the support for the lumbar-thoracic transition region, after which the position of the lumbar-sacral support is moved to a selected fixed position relative to the support for the lumbar-thoracic transition region during use to engage the lumbar region of said person and wherein the support for the lumbar-thoracic transition region is adjusted prior to adapting the position of the lumbar-sacral support.

17. A method according to claim 16 , wherein the lumbar-sacral support is adjusted to form a convex support together with the support for the lumbar-thoracic transition region.

18. A method according to claim 17 , wherein said device furthermore comprises a support for the thoracic-cervical transition region, and wherein, once said person leans against said support for the lumbar-thoracic transition region, and preferably after the posture of the lumbar-sacral support has been adapted, the position of said support is adapted to the individual curvature of the thoracic-cervical transition region of said person.

19. A method according to claim 16 , wherein said device furthermore comprises a support for the thoracic-cervical transition region, and wherein, once said person leans against said support for the lumbar-thoracic transition region, and preferably after the posture of the lumbar-sacral support has been adapted, the position of said support is adapted to the individual curvature of the thoracic-cervical transition region of said person.

20. Wheelchair or chair comprising a device according to claim 1 .