Lub koob indwelling txuas nrog lub infusion teem kom tso pa tawm thiab standby. Tus neeg mob nthuav tawm qhov chaw puncture, thiab ib tug tourniquet khi kaum centimeters saum toj no pre-puncture point. Cov tawv nqaij yog tshuaj tua kab mob nyob rau hauv ib tug kauv qauv nrog puncture point raws li qhov chaw, npog thaj tsam ntawm 8X8cm. Kev hnav khaub ncaws tsis huv yog rhais tawm, rab koob lub hau yog rub tawm, rab koob bevel tau hloov kho, tus neeg mob ib nrab tuav nws lub nrig, rab koob yog sab laug dua, daim tawv nqaij nruj, rab koob yog ntxig rau ntawm 15 mus rau 3 {{ 6}} degrees, thiab rab koob yog 0.2 cm tom qab cov ntshav rov qab. Cov ntawv qhia hlau yog rub tawm, thiab tag nrho cov hose raug xa mus rau hauv cov hlab ntsha. Lub tourniquet yog loosened, tus neeg mob loosens nws lub nrig, thiab tag nrho cov koob cores yog rub tawm, muab tso rau hauv lub sharps thawv, tsau nrog ib tug zaj duab xis, thiab lub hau heparin yog tsau saum toj kawg nkaus ntawm lub indwelling koob hose. Kev ua haujlwm tiav.