Expandable anchoring device

An expandable anchoring device, comprising:

• an outer tube base having a tube body, wherein a direction of an axis of the tube body is defined as an axial direction, and a direction perpendicular to and passing through the axis of the tube body is defined as a radial direction, two opposite ends of the tube body along the axial direction are respectively defined as a distal end and a proximal end;
• the tube body has an axial hole extending along the axial direction;
• a periphery of the tube body has a plurality of openings, wherein two opening side walls are respectively provided on two opposite sides of each of the plurality of openings in a direction perpendicular to the radial direction;
• a distance between the two opening side walls of each of the plurality of openings gradually decreases from an inside of the tube body to an outside of the tube body;
• a plurality of blocks respectively disposed in one of the plurality of openings, wherein two block side walls are respectively provided on two opposite sides of each of the plurality of blocks in the direction perpendicular to the radial direction;
• a distance between the two block side walls of each of the plurality of blocks gradually decreases from the inside of the tube body to the outside of the tube body;
• a side of each of the plurality of blocks facing the distal end has a distal end side wall, and another side of each of the plurality of blocks opposite to the distal end side wall and facing the proximal end has a proximal end side wall;
• an inside and an outside of each of the plurality of blocks in the radial direction has an inner surface and an outer surface, respectively;
• a length of the distal end side wall along the radial direction is defined as a distal end width;
• a length of the proximal end side wall along the radial direction is defined as a proximal end width;
• the distal end width is smaller than the proximal end width;
• a side of the outer surface of each of the plurality of blocks facing the proximal end protrudes out of one of the plurality of openings more than another side of the outer surface of each of the plurality of blocks facing the distal end;
• an expanding member passing through the axial hole and having a tapered portion and a columnar portion that are connected to each other;
• a diameter of an end of the tapered portion facing the distal end is greater than a diameter of another end of the tapered portion facing the proximal end;
• the tapered portion has an inclined surface;
• the columnar portion is connected to the end of the tapered portion facing the distal end and has a columnar surface;
• at least a part of the columnar surface abuts against the inner surface of each of the plurality of blocks;
• and
• a pulling member, wherein an end of the pulling member facing the distal end penetrates through the axial hole and is engaged with the expanding member, and another end of the pulling member has a ring.