Method for producing an immobilisation element (1) for immobilising a body part of a patient on a supporting surface, wherein the immobilisation element (1) comprises a sheet (8) of thermoplastic material for receiving the body part to be immobilised, and at least one profile (3) for fixing the immobilisation element (1) to the supporting surface, wherein the profile (3) comprises a first fixing means for fixing the profile (3) to the sheet (8), wherein the fixing means comprises a groove (9) delimited by a first contact surface (6) and a second contact surface (7) opposite the first contact surface (6), wherein the groove (9) receives the sheet (8) so that the first and the second contact surfaces (6, 7) lie along the sheet (8), and wherein at least one of the first contact surface (6) and the second contact surface (7) is provided with at least one protrusion (10), wherein the protrusion (10) penetrates the sheet (8) of thermoplastic material in the thickness direction of the sheet (8) in order to anchor the sheet (8) of thermoplastic material in the groove (9).本發明係一種用於將患者某一身體部位固定在支撑面上的固定元件（1）的製備方法，其特徵在於：所述固定元件（1）由一種用以接收要固定的身體部位的熱塑板（8）和至少一種用以固定所述固定元件（1）至所述支撑面的型面（3）構成，其中所述型面（3）包含一種用以固定所述型面（3）至所述熱塑板（8）的第一固定裝置，其中所述固定裝置包含一種被第一個接觸面（6）和與第一個接觸面（6）相對的第二個接觸面（7）分隔開的凹槽（9），其中所述凹槽（9）接收所述熱塑板（8），以便使所述第一個和第二個接觸面（6、7）沿著所述熱塑板（8）設置，而且所述第一個接觸面（6）和所述第二個接觸面（7）中至少一個設有至少一個突出（10），其中所述突出（10）在所述熱塑板（8）的厚度方向上穿入所述熱塑板（8）中，進而將所述熱塑板（8）錨定在所述凹槽（9）內。
