Surgical implement for piercing tissue

A surgical tool for piercing tissue of a body, comprising:

• a hollow external component (1), configured to define a longitudinal axis, having a peripheral wall (11) and a distal end (10);
• an internal component (2), at least partially disposed inside the hollow external component (1), movable inside the external component (1) along the longitudinal axis;
• a plurality of movable components (3) mounted outside the peripheral wall (11) of the external component (1);
• an actuating portion (22) connected to an outer surface of the internal component (2), each actuating portion having a slot (221) for receiving a movable pin (31);
• a plurality of bladders (6) configured to cover the movable components (3);
• wherein,
• the internal component (2) has a piercing head (21) at the distal end (10) of the external component (1);
• each movable component (3) has a plurality of movable pins (31) extending into the peripheral wall (11);
• when the piercing head (21) and the internal component (2) retract relative to the external component (1), each movable component (3) deforms partially, expands outwardly in a radial direction, and fills a corresponding bladder (6).