Impact type blood collection apparatus, negative pressure blood collection pen and blood collection method

An impact type blood collection apparatus, at least comprising:

• a base;
• a front cover, a rear end of the front cover being detachably connected to the base, and the front cover and the inside of the base forming a first space;
• a needle stand, the needle stand being located in the first space, a front end of the needle stand being provided with a blood collection needle mounting groove, the needle stand having a first position at the end close to the base and a puncture position at the end away from the base in the first space, and the needle stand being capable of moving axially between the first position and the puncture position;
• a first elastic element, the first elastic element enabling the needle stand to be maintained in the first position, the first elastic element being in an energy storage state when the needle stand is in the puncture position, and the first elastic element driving the needle stand to restore from the puncture position to the first position;
• an impact element, an impact cavity for accommodating the impact element being arranged in the needle stand, and the impact element being located in the impact cavity and being capable of moving axially;
• a blocking element, the blocking element being located in an open direction of the impact cavity, and the blocking element being provided with a through hole for accommodating a part of the impact element to pass through;
• and
• an impact spring, the impact spring being sleeved over the impact element and located between an impact end of the impact element and the blocking element.