Access needles and guidewire

(Top panel) Seldinger needle (left) with its sharp solid obturator in place, Potts-Cournand needle (center), with a hollow obturator that allows the operator to see blood flashback, and an 18 gauge thin-wall needle (right). The needles are surrounded by an 0.038 inch, 145 cm J-guidewire.
(Bottom panel) A Doppler-guided SmartNeedle.