Instant pressure-reducing process and device for a blood-gathering tube

A blood-gathering tube and a pressure-reducing device, wherein said blood-gathering tube comprising a tube body and an elastic cork, a first end of said tube body being open and a second end being closed, a radially central part of said elastic cork being thinner than the periphery of said elastic cork to facilitate penetration by a needle, said elastic cork being tightly nested into said first end of said tube body so as to hermetically seal the interior of said tube body from the exterior, and wherein said pressure-reducing device comprises:

• a vacuum body having a vacuum chamber maintained at a low pressure, said vacuum body having an air pipe connected to the interior of said vacuum chamber;
• a vacuum pump connected to said vacuum chamber, for maintaining the low pressure in said vacuum chamber;
• a sliding socket pipe disposed at least partially in said vacuum body for relative movement with respect thereto, said sliding socket pipe having an internal air passage which can be selectively aligned with said air pipe in said vacuum body;
• a hollow needle mounted to said sliding socket pipe, said hollow needle having a central air passage which communicates with the internal air passage of the sliding socket pipe, said hollow needle being capable of piercing said elastic cork when said elastic cork is forced against said needle, wherein penetration of said needle past said elastic cork results in communication between the inside of said hollow needle and the interior of said tube body, and wherein alignment of said internal air passage with the air pipe of the vacuum body while said needle has penetrated the elastic cork, results in the reduction of pressure in the tube body, to the low pressure in the vacuum chamber.