Orthosis for treating rhizarthrosis

An orthosis intended to be placed on the hand of a user, in particular to treat rhizarthrosis, comprising:

• a supporting member formed from a flexible material and having a general shape of a horse saddle, having an inner flange and an outer flange connected by a curved U-shaped junction band, the inner and outer flanges arranged opposite one another and spaced apart by the junction band, the supporting member being arranged to be able to be placed at a thumb-index commissure with the inner flange configured for placement against a palm and the outer flange configured for placement against a back surface of the hand, the junction band configured for bearing on a proximal phalange of a thumb and on a proximal phalange of an index finger in order to enable a spacing to be maintained between the thumb and the index finger to procure an antalgic effect and assure a range of motion, and adapted to immobilize an osteoarticular column of the thumb;
• a strap to be placed around the hand and the supporting member, so as to retain said supporting member, the orthosis being arranged such that a metacarpal bone of the thumb is trapped inside the orthosis between the strap and the supporting member and the extension of the strap at least extends between an outer edge of the inner flange and an outer edge of the outer flange to cover the entirety of the junction band;
• a rigid dorsal rod connected to the supporting member and/or the strap;
• a rigid palmar strip associated with the strap;
• wherein the orthosis is arranged such that a column of the thumb is trapped between the dorsal rod and the palmar strip.

An orthosis adapted to be placed on a hand of a user, in particular to treat rhizarthrosis, comprising:

• a supporting member having a general shape of a horse saddle, having an inner flange and an outer flange connected by a curved U-shaped junction band, the inner and outer flanges arranged opposite one another and spaced apart by the junction band, the supporting member being arranged to be able to be placed at a thumb-index commissure with the inner flange configured for placement against a palm and the outer flange configured for placement against a back surface of the hand, the junction band configured for bearing on a proximal phalange of a thumb and on a proximal phalange of an index finger in order to enable a spacing to be maintained between the thumb and the index finger to procure an antalgic effect and assure a range of motion, and adapted to immobilize an osteoarticular column of the thumb, the inner and outer flanges being generally parallel near the junction band and the inner flange curving outwardly from the junction band toward its free end, and
• a strap that is separate and independently reconfigurable with respect to the supporting member, the strap to be placed around the hand and the supporting member, so as to retain said supporting member, the orthosis being arranged such that a metacarpal bone of the thumb is trapped inside the orthosis between the strap and the supporting member and the strap extends over the entirety of the junction band;
• a rigid dorsal rod connected to the supporting member and/or the strap;
• a rigid palmar strip associated with the strap;
• wherein the orthosis is arranged such that a column of the thumb is trapped between the dorsal rod and the palmar strip.