Vascular puncture sheath facilitating fixation and redirection and vascular puncture device

A vascular puncture sheath facilitating fixation and redirection, comprising:

• a puncture base;
• an inner sheath tube, connected to a lower end of the puncture base;
• an outer sheath tube, movably sleeved on an outside of the inner sheath tube;
• a metal stent, fixedly arranged at a lower end of the outer sheath tube and used for fixing the outer sheath tube in the blood vessel;
• wherein, a longitudinally extending chamber is provided between the inner sheath tube and the outer sheath tube;
• a tube wall of the outer sheath tube is provided with a plurality of through-holes communicating with the chamber, the metal stent includes a plurality of memory metal wires, lower ends of the memory metal wires are fixed on an outer wall of the outer sheath tube, and upper ends of the memory metal wires pass through the corresponding through-holes into the chamber and are connected to a tube wall of the inner sheath tube;
• an adjustment mechanism located above the metal stent is also provided in the chamber, the outer sheath tube moves relative to the inner sheath tube, thereby driving the adjustment mechanism to control the expansion or contraction of the metal stent.