With soft cannula, intravenous indwelling needle is operated easily, it can generally indwell for 3 days, reduce the patients’ suffering due to penetrating repeatedly, protect blood vessel and reduce the probability of phlebitis.
 
The one-way method of holding ’Y’ type indwelling needle is more suitable to the habit of the clinical nurse and increases success of penetrating.
 
Trocar, lengthened pipe and heparin cap integrated together can previously connect vein transfusion equipment to exhaust air.