Syringe dead space: difference between revisions
Diff·revision 15 → 16·16:32, 14 Oct 2025
Difference between revision 15 and revision 16 of Syringe dead space. 4 lines changed; the page grew by 631 bytes.
| Revision 15 — 14:18, 11 Oct 2025 StubSorterBot (talk) bot: expand DOI to full citation 7,980 bytes +31 | Revision 16 — 16:32, 14 Oct 2025 GradientGus (talk) fix arithmetic in worked example 8,611 bytes +631 | ||
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| 1 | {{Infobox concept | 1 | {{Infobox concept |
| 2 | | name = Syringe dead space | 2 | | name = Syringe dead space |
| + | 3 | | image = syringe.svg | |
| + | 4 | | caption = Dead space lies distal to the plunger tip at full depression: the hub cavity, the needle lumen and any recess in the plunger face. | |
| 3 | | Also known as = Residual volume; hold-up volume; wastage volume | 5 | | Also known as = Residual volume; hold-up volume; wastage volume |
| 4 | | Location = Needle hub, needle lumen, plunger-tip recess | 6 | | Location = Needle hub, needle lumen, plunger-tip recess |
| ⋮ | ⋮ | ||
| 60 | | 30G | 0.312 mm | 0.159 mm | 0.25 µL | | 62 | | 30G | 0.312 mm | 0.159 mm | 0.25 µL | |
| 61 | | 31G | 0.261 mm | 0.133 mm | 0.18 µL | | 63 | | 31G | 0.261 mm | 0.133 mm | 0.18 µL | |
| + | 64 | ||
| + | 65 | Volumes are computed as the product of cross-sectional area and length; outside diameters follow the metric equivalents of the Birmingham gauge series used in ISO 9626, and inside diameters are typical regular-wall values.{{r|iso9626}} A 27G half-inch needle therefore holds 0.44 µL, roughly one part in 160 of a 70 µL hub. Changing needle gauge or length has almost no effect on dead space; changing the hub design changes it by an order of magnitude. | |
| 62 | 66 | ||
| 63 | === Effect of needle length === | 67 | === Effect of needle length === |