There is described a method of producing a custom medical splint or brace (500) for immobilization of a selected region (A) of a patient's body part (L). The custom medical splint or brace (500) is produced in accordance with the following sequences of operations, namely :(a) production of a three-dimensional mould (20) of a portion of the patient's body part (L) comprising the selected region (A) of the patient's body part (L) onto which the desired medical splint or brace (500) is to be placed ；(b) definition of a three-dimensional shape of the desired medical splint or brace (500) covering the selected region (A) of the patient's body part (L) onto which the desired medical splint or brace (500) is to be placed ；(c) generation of a two-dimensional template (45) of the desired medical splint or brace (500) corresponding to the defined three-dimensional shape, which two-dimensional template (45) corresponds to unfolding in a two-dimensional plane of the three-dimensional shape of the desired medical splint or brace (500) ；(d) production of at least one plate of mouldable material (50, 55, 55*) in accordance with the two-dimensional template of the desired medical splint or brace (500) ； and(e) moulding of the plate of mouldable material (50, 55, 55*) onto the three-dimensional mould (20) to shape the desired medical splint or brace (500).
