It was supposed that the new coronavirus vaccine developed by American pharmaceutical giant Pfizer could be inoculated 6 times from one container, but the Ministry of Health, Labor and Welfare said on the 9th, 5 times with syringes prepared in Japan. I made it clear that I can only do it.
I asked the reason for this at a university hospital preparing for vaccination.
According to Professor Tomohisa Ishikawa, who is the leader in vaccination of medical staff at the Jikei University Hospital in Minato-ku, Tokyo, the syringes currently in use are Pfizer's vaccines from one container to 6 He found it difficult to give a single dose.
This vaccine is to be inoculated by sucking out one dose with a syringe from a container called a vial for each inoculation.
One vial contains 1.8 ml of vaccine, which requires exactly 0.3 ml to be aspirated for 6 doses.
However, when the vaccine is sucked out with a syringe, the sixth dose does not contain the 0.3 ml required for one inoculation in the vial.
This is because syringes that are commonly used in Japan have a structure in which a small amount of vaccine accumulates at the base of the needle, and when taking a 0.3 ml vaccine, it actually sucks out more than that. It means that it has been done.
The vaccine left in the syringe does not come out of the syringe even if the syringe is pushed in, so there is no choice but to discard it as it is.
It is said that specially shaped syringes with a protrusion on the tip of the syringe of the syringe are distributed overseas, mainly in Europe and the United States, so that the vaccine does not remain at the base of the needle, but there is a shortage overseas as well. It means that there is.
Professor Ishikawa said, "While preparing in the hospital, when I tried to work on it, it seemed difficult to divide the amount in one container into 6 people. All over the world. This is the first time for me, so I would like to prepare for it each time and protect medical care. "