Thumb orthosis

An orthosis for fastening to a human hand for immobilizing a carpometacarpal joint and metacarpophalangeal joint of a thumb of the hand, comprising

• a stiff body having two directly connected round shaped portions that anatomically correspond to a heel of the hand in which each round shaped portion includes round openings for receiving portions of the heel of the hand therethrough, the two directly connected round shaped portions form a metacarpal section and a stiff thumb section,
• the metacarpal section
• has a first end and a second end, which are spaced apart from each other, and
• is designed in such a manner that said metacarpal section can be brought into engagement with the human hand such that the metacarpal section rests exclusively in the region of the palm of the hand below the metacarpophalangeal joints of an index finger, middle finger, ring finger and little finger such that it extends in a direction between two edges of the hand over the palm, and
• the stiff thumb section
• extends from the metacarpal section and has a first end, which is fastened to the metacarpal section or is formed by part of the metacarpal section, and a second end,
• in a region of its second end, has a ring-shaped or ring-segment-shaped thumb holding section and
• is designed in such a manner that when the metacarpal section is brought into engagement with the hand, the thumb section can be placed at the thumb of the hand such that the thumb is arranged in a ring opening defined by the thumb holding section, and the thumb holding section extends over at least part of the circumference of the thumb and at least partially surrounds the thumb, and
• supports the thumb against a movement in the direction of the palm in a position in which the thumb and the index finger of the hand are put opposite each other and the index finger can be moved toward the thumb into contact therewith and can be moved away from the thumb, wherein
• the metacarpal section is designed in such a manner that, when the orthosis is placed onto the human hand and the metacarpal section has been brought into engagement with the hand and the thumb section has been placed against the thumb of the hand such that the thumb is arranged in the ring opening defined by the thumb holding section and the thumb holding section extends over at least part of the circumference of the thumb and at least partially surrounds the thumb, said metacarpal section rests against the hand exclusively in the region of the palm, the metacarpal section has a first surface for contact with the palm and an opposite, second surface which, when the orthosis is put on, is directed away from the hand, wherein the first surface has two concave sections and a convex section arranged between the two concave sections, and
• which furthermore has a closure device for fastening the orthosis when placed on the hand, wherein the closure device has at least one first fastening section which is arranged and configured in such a manner that, when the orthosis is placed on, said fastening section can be arranged and secured on the metacarpal section or the thumb section in such a manner that said fastening section runs over the back of the hand and, together with the metacarpal section, forms at least part of an annularly closed section of the orthosis, which section surrounds the hand.