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- Q1771494 subject Q6608774.
- Q1771494 abstract "A winged infusion set—also known as "butterfly" or "scalp vein" set—is a device specialized for venipuncture: i.e. for accessing a superficial vein for either intravenous injection or phlebotomy. It consists, from front to rear, of a hypodermic needle, two bilateral flexible "wings", flexible small-bore transparent tubing (often 20–35 cm long), and lastly a connector (often female Luer). This connector attaches to another device: e.g. syringe, vacuum tube holder/hub, or extension tubing from an infusion pump or gravity-fed infusion / transfusion bag/bottle.Newer models include a slide and lock safety device slid over the needle after use, which helps prevent accidental needlestick injury and reuse of used needles, which can transmit infectious disease such as HIV and viral hepatitis.During venipuncture, the butterfly is held by its wings between thumb and index finger. This grasp very close to the needle facilitates precise placement. The needle is generally inserted toward the vein at a shallow angle, made possible by the set's design. When the needle enters the vein, venous blood pressure generally forces a small amount of blood into the set's transparent tubing, and this visible "flash" signals venous entry.The butterfly offers advantages over a simple straight needle. The butterfly's flexible tubing reaches more body surface and tolerates more patient movement. The butterfly's precise placement facilitates venipuncture of thin, "rolling", fragile, or otherwise poorly accessible veins. The butterfly's shallow-angle insertion design facilitates venipuncture of very superficial veins, e.g. hand, wrist, or scalp veins (hence name "scalp vein" set).Butterflies are commonly available in 18-27 gauge bore, 21G and 23G being most popular. Indeed, in phlebotomy, there is widespread avoidance of 25G and 27G butterflies based on belief that such small-bore needles hemolyze and/or clot blood samples and hence invalidate blood tests.Contrary to this widespread belief, theoretical calculation and in vitro experiment both showed the exact opposite: namely, that shear stress and hence hemolysis decrease with decreasing needle bore (but the decrease can be clinically insignificant). In agreement with these results, a subsequent clinical trial found that 21G, 23G, and 25G butterflies connected directly to vacuum tubes caused the same amount of hemolysis and gave the same coagulation panel test results.".
- Q1771494 thumbnail Butterfly_needle.png?width=300.
- Q1771494 wikiPageWikiLink Q1165892.
- Q1771494 wikiPageWikiLink Q1565962.
- Q1771494 wikiPageWikiLink Q15787.
- Q1771494 wikiPageWikiLink Q166231.
- Q1771494 wikiPageWikiLink Q172145.
- Q1771494 wikiPageWikiLink Q179217.
- Q1771494 wikiPageWikiLink Q183605.
- Q1771494 wikiPageWikiLink Q1983841.
- Q1771494 wikiPageWikiLink Q2006950.
- Q1771494 wikiPageWikiLink Q201035.
- Q1771494 wikiPageWikiLink Q221681.
- Q1771494 wikiPageWikiLink Q273318.
- Q1771494 wikiPageWikiLink Q30612.
- Q1771494 wikiPageWikiLink Q3595842.
- Q1771494 wikiPageWikiLink Q365074.
- Q1771494 wikiPageWikiLink Q471706.
- Q1771494 wikiPageWikiLink Q5363933.
- Q1771494 wikiPageWikiLink Q5531000.
- Q1771494 wikiPageWikiLink Q5598078.
- Q1771494 wikiPageWikiLink Q640448.
- Q1771494 wikiPageWikiLink Q657936.
- Q1771494 wikiPageWikiLink Q6608774.
- Q1771494 wikiPageWikiLink Q6986603.
- Q1771494 wikiPageWikiLink Q82642.
- Q1771494 wikiPageWikiLink Q886543.
- Q1771494 wikiPageWikiLink Q886549.
- Q1771494 wikiPageWikiLink Q886837.
- Q1771494 comment "A winged infusion set—also known as "butterfly" or "scalp vein" set—is a device specialized for venipuncture: i.e. for accessing a superficial vein for either intravenous injection or phlebotomy. It consists, from front to rear, of a hypodermic needle, two bilateral flexible "wings", flexible small-bore transparent tubing (often 20–35 cm long), and lastly a connector (often female Luer). This connector attaches to another device: e.g.".
- Q1771494 label "Winged infusion set".
- Q1771494 depiction Butterfly_needle.png.