1. Fixing device for a coupling pin intended for the surgical treatment of the spinal column, comprising a plastic connecting pin (1), a plurality of bone screws (2), each of which has an opening (3) for the pin (1) and the clamping device (4) characterized in that the plastic pin is provided with at least two two-dimensional, parallel surfaces (35, 36) and in that the distance between the side walls (39) of the opening corresponds to the distance between the two-dimensional, parallel surfaces (35, 36) in the contact region , So m, the pin slides tightly adhering, in otverstiya.2. The fixing device according to claim 1, characterized in that the abutment surface (44) of the opening (3) situated between the side walls (39) and the corresponding anterior surface of the pin (1) abut tightly to each other so that the pin (1) is placed a hole substantially at a position free hoda.3. The fixing device according to claim 1, characterized in that the fixing action performed by the clamping device (4) is made parallel to the two-dimensional, parallel surfaces (1a), wherein the pin is secured around obhvatu.4. The fixing device according to claim 1, characterized in that the plastic pin (1) has at least 4 storony.5. The fixing device according to claim 1, characterized in that at least one effective conical portion (42, 43) of the front surface (44) of the rod (1) is significantly limited on edge by the front edge of one of the two-dimensional, parallel surfaces (35, 36) is chamfered to facilitate insertion of the rod into the hole (3), wherein preferably each tapered portion is beveled1. Фиксирующее устройство для соединительного штифта, предназначенного для хирургического лечения позвоночного столба, содержащее пластиковый соединительный штифт (1), множество костных винтов (2), каждый из которых имеет отверстие (3) для штифта (1), и зажимное устройство (4), отличающееся тем, что пластиковый штифт имеет, по меньшей мере, две плоскостно-параллельные поверхности (35, 36) и тем
