Blood collection needle

A blood collection needle, comprising:

• a cylinder body provided with a needle core and a needle body therein, wherein the needle body is disposed in the needle core and a needle point of the needle body protrudes from a front end of the needle core, and a convex strip extending in a front-rear direction is disposed on an inner peripheral wall of the cylinder body;
• a launch spring disposed in the cylinder body, stopped against between the cylinder body and the needle core, and configured to press the needle core forward;
• a launch sleeve having a pushing portion, disposed in the cylinder body and movable from a first position to a second position in the front-rear direction;
• and
• a connecting ring disposed in the cylinder body and located in rear of the launch sleeve;
• wherein a front end of the connecting ring is provided with teeth and a tooth groove between adjacent teeth, and at least one of a rear end surface of the pushing portion and a front end surface of the teeth is an inclined plane;
• wherein in the first position, a front end of the launch sleeve protrudes from a front end of the cylinder body, a rear end of the convex strip engages in the tooth groove, and the connecting ring stops the needle core from moving forward;
• wherein when the launch sleeve moves from the first position to the second position, the pushing portion drives the connecting ring to move backward by pushing the teeth, the convex strip is disengaged from the tooth groove, and the teeth slide relative to the pushing portion under a pressure of the launch spring to drive the connecting ring to rotate, such that the connecting ring releases the needle core, and the needle core is launched forward under a push of the launch spring.