Closed type arterial blood collection apparatus

A closed type arterial blood collection apparatus comprising:

• a saline bag configured to receive a saline solution, wherein a first port and a second port are provided at a lower end of the saline bag;
• an A line configured to connect an arterial blood vessel of a patient to the first port, the A line being filled with the saline solution-from the saline bag;
• a first three-way valve configured to open and close the A line in a state of being mounted on the A line;
• a blood collection syringe configured to collect arterial blood through the first three-way valve when the first three-way valve closes the A line;
• a second three-way valve provided between the first three-way valve and the first port, the second three-way valve being configured to open and close the A line;
• a guide tube configured to connect the second three-way valve to the second port, the guide tube being filled with the saline solution from the saline bag;
• and
• a fluid conveying unit configured to convey a fluid in the guide tube to the saline bag when the A line and the guide tube are connected to each other as a result of operation of the second three-way valve, wherein
• the A line comprises a catheter having a blood collection needle, the catheter being connected to the first three-way valve, a proximal tube configured to connect the first three-way valve and the second three-way valve to each other, and a distal tube configured to connect the second three-way valve and the first port to each other,
• the A line is configured to directly connect the saline bag and the arterial blood vessel to each other in a state of bypassing the guide tube through the second three-way valve, to receive the saline solution from the saline bag, and to transmit a pulse signal of an artery of the patient through the saline solution,
• a transducer configured to be mounted on the A line and convert the pulse signal of the artery of the patient transmitted through the saline solution used as a medium into an electrical signal and to transmit the electrical signal to an external patient monitor,
• the blood collection syringe collects the arterial blood of the patient through the proximal tube in a state in which the distal tube between the first port and the guide tube is closed through the second three-way valve, the proximal tube and the guide tube communicate with each other through the second three-way valve, and the arterial blood is moved along with the saline solution from the arterial blood vessel to the guide tube, and
• the fluid conveying unit comprises a pump configured to press an outer circumferential surface of the guide tube in a longitudinal direction thereof in order to push and thus move the arterial blood in the guide tube in the longitudinal direction of the guide tube such that an interface between initial blood and internal blood is located between the first three-way valve and the second three-way valve and an interface between the initial blood and the saline solution is located between the second three-way valve and the fluid conveying unit in a state in which the distal tube between the first port and the guide tube is closed through the second three-way valve and the proximal tube and the guide tube communicate with each other through the second three-way valve.