Patent ID: 8109959

Claim:
A blood sampling apparatus comprising: a shell having an inner wall and a retaining space, said retaining space having a needle outlet at one end and an insertion end at an opposite end thereof; a through-flange protruding inwardly from said inner wall of said shell, said through-flange having a tapered end face formed thereon adjacent said inner wall of said shell, said tapered end face and said inner wall defining a release groove; a trigger seat movable mounted into said retaining space of said shell, said trigger seat having a control end and a rod, said rod having an axial chamber opening thereon such that a pair of elastic release blades are formed thereon, said pair of elastic release blades being respectively received into said release groove; an abutting bevel edge positioned at a bottom of the elastic release blade, said abutting bevel edge mated with said tapered end face; a needle stand having a coupling end and a pricker, said coupling end positioned in said axial chamber of said trigger seat; an elastic resetter assembled between said axial chamber of said trigger seat and said needle stand, said elastic resetter being in a state of accumulating elastic force such that said needle stand can be driven to reset inwardly after the elastic force is released from said state; and a safety switching member suitable for displacing said trigger seat and for allowing said pricker to protrude outwardly of said needle outlet of said shell, said safety switching member having a limiting slot and a pair of locking bulges, said limiting slot formed on said inner wall of said shell, said pair of locking bulges being arranged on a wall of said rod of said trigger seat corresponding to said axial chamber, said limiting slot formed an axial indent and an annular indent.