And i’m seeing more facilities switch to Sarstedt S-Monovette lately; our outpatient site started them today with 23g butterflies. Anyone have a concise PDF or short video you trust on the aspiration technique and handling when coming from Vacutainer?
With S‑Monovette in aspiration mode, I get smoother draws by pre‑tensioning the plunger a hair before venipuncture and then using ‘micro‑pulls with pauses’ — as soon as you see flash, advance only 1–2 mm at a time to keep 23g veins from collapsing. If the vein feels robust I’ll flip to vacuum after flow is established; do you want a short video or a one‑page IFU?
Day-one with 23g butterflies, feather the plunger — micro pulls with brief pauses — until 2–[redacted], then “lock” only if the vein looks steady. The concise walkthrough I trust is Sarstedt’s official aspiration video here: https://www.youtube.com/@SARSTEDTGroup — @coro496 is right on pre‑tension; I also tilt the tube slightly so the plunger’s own weight doesn’t add suction.
Quick example: with 23g butterflies I brace the S‑Monovette barrel against my palm and hook a finger under the plunger flange so I can draw straight back; it prevents the tiny side torque that makes fragile veins collapse. @OP, if you hit a stall mid‑fill, try easing the plunger forward a millimeter to let the vein recover before continuing — does that fix it for you?