2024-04-08

Key Quality Control of Machining U Head of Polyaxial Pedicle Screw

► Processing Steps:

1. Milling, reaming, and tapping
2. Precision finishing of the outer circle
3. Side milling, rough slotting, precision milling of slots
4. Precision finishing of internal thread burrs
5. Back main shaft precision finishing of internal hole burrs
6. Precision finishing of 3-point offset spike hole

► Key Quality Controlss:

(1) No burrs should remain at the junction of the U-shaped groove and the internal thread.
(2) No burrs should remain at the junction of the side hole and the internal thread.
(3) No gaps should exist when the U-shaped groove is joined with the cylindrical rod.
(4) The surface must be free from any tool marks or burrs.
(5) The Buttress thread must adhere to design requirements.
(6) The angles of the U-shaped groove and the 3-point offset spike hole must comply with design specifications.