Collection device with a valve for a liquid specimen

A collection device with a valve for a liquid specimen, comprising:

• a reservoir having a sealed cavity for storing the liquid specimen, wherein:
• the sealed cavity has a fixed volume;
• and
• the sealed cavity is sealed by an airtight plug, wherein the airtight plug is configured to accommodate a depressurization means such that the fixed volume of the sealed cavity can be depressurized to a vacuum and maintain a set negative pressure;
• a delivery tube in communication with the sealed cavity of the reservoir and having a delivery inlet, a delivery outlet, and the valve, wherein:
• the valve is disposed between the delivery inlet and the delivery outlet, and
• the valve is configured to control communication and blocking between the delivery inlet and the delivery outlet;
• and
• a piercing component for piercing a tissue and in communication with the delivery inlet of the delivery tube, wherein:
• the piercing component comprises a main body and a piercing portion connected to the main body, and
• the piercing portion has a bent shape,
• wherein:
• the valve includes a pressing unit, a rod body connected to the pressing unit, an inner cavity cooperating with the rod body, a first seal ring and a second seal ring separately arranged at different positions on the rod body, and an elastic component provided in the inner cavity;
• the delivery inlet, the delivery outlet, and the piercing component are in communication when the rod body is at a first position;
• the delivery inlet is not in communication with the delivery outlet when the rod body is at a second position;
• the airtight plug is provided at one end close to the delivery outlet of the delivery tube;
• and
• the airtight plug is radially positioned at a cone shaped portion of the delivery tube such that a part of a top surface of the airtight plug is above a cone surface and another part of the top surface of the airtight plug is below the cone surface.