Fig 2. Technical drawing of the extruder used for the fabrication of the bTEBV.

The N,O-CMC-based material is filled into a syringe (s) which is hooked to the extruder (e). (A and B) By pressing the material with the plunger (p) into the syringe and through the aperture disc (ad), hooked within the molder (m) via the aperture disc in the molder, into the hardening tube, a tube around the central stab is formed. The tube, the bTEBV, undergoes hardening in the hardening tube, a process driven by Ca²⁺.