VACUUM BLOOD COLLECTOR EQUIPPED WITH NEGATIVE PRESSURE LEVEL ADJUSTING FUNCTION

摘要

PURPOSE:To always stably execute a blood collection regardless of the thickness of the blood vessel of a blood offering person by reduce-controlling the negative pressure of a vacuum blood collecting room so as to be lower than a set pressure on conditions that the increase rate of the measured value of a blood collecting quantity measuring means does not attain to a normal increase rate to be specified beforehand. CONSTITUTION:The goal level of the negative pressure prepared in a vacuum blood collecting room 13 is made into the set pressure, it is stored into a memory 66, the real pressure of the vacuum blood collecting room 13 is detected by a pressure sensor 73, and the pressure of the vacuum blood collecting room 13 is controlled by a CPU 56 so that a detected pressure can coincide with the set pressure. Simultaneously, a blood collecting quantity to a blood bag 1 is measured, the CPU 65 judges that the needle hole of a blood collecting needle is in a blocked condition by absorbing a blood vessel wall on conditions that the increase rate of the measured blood collecting quantity does not attains to the normal increase rate to be specified beforehand in a condition in which the detected pressure attains to the set pressure, and the negative pressure of the vacuum blood collecting room 13 is reduce-controlled so as to be lower than the set pressure. Thus, a blood collecting suction force is automatically adjusted to a blood collecting capable level. Consequently, regardless of the thickness of the blood vessel of the blood offering person, the blood collection can be always stably executed.