Syringe dead space: difference between revisions
Diff·revision 27 → 28·10:01, 30 Nov 2025
Difference between revision 27 and revision 28 of Syringe dead space. 2 lines changed; the page grew by 468 bytes.
| Revision 27 — 14:17, 26 Nov 2025 BlankVialBo (talk) lead should summarise the body, not add to it 12,333 bytes ±0 | Revision 28 — 10:01, 30 Nov 2025 TrialsTabitha (talk) remove weasel wording 12,801 bytes +468 | ||
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| 91 | * For a smaller intended dose of 0.05 mL, the same 0.070 mL dead space exceeds the dose entirely; no plunger position can deliver 0.05 mL if that volume of air must first be displaced from the hub. | 91 | * For a smaller intended dose of 0.05 mL, the same 0.070 mL dead space exceeds the dose entirely; no plunger position can deliver 0.05 mL if that volume of air must first be displaced from the hub. |
| 92 | 92 | ||
| + | 93 | The vial-yield arithmetic follows from the wastage figure. Each dose consumes 0.20 mL delivered plus 0.070 mL retained, or 0.270 mL. From 2.00 mL, seven full doses can be drawn (7 × 0.270 = 1.89 mL), with 0.11 mL remaining — insufficient for an eighth. The nominal ten doses have become seven, a 30% reduction. With a fixed-needle insulin syringe at 0.005 mL, each dose consumes 0.205 mL and nine full doses can be drawn, with 0.155 mL remaining.{{r|ppdeadspace}} | |
| + | 94 | ||
| 93 | === Priming and air management === | 95 | === Priming and air management === |
| 94 | The mechanism by which the dose error arises is the presence of gas where liquid is assumed. Descriptions of injection technique in manufacturers' [[Prescribing information|prescribing information]] and in nursing references accordingly treat expulsion of air before the dose is measured as a defined step, and treat the graduation as valid only for a gas-free barrel and hub.{{r|who2015}} | 96 | The mechanism by which the dose error arises is the presence of gas where liquid is assumed. Descriptions of injection technique in manufacturers' [[Prescribing information|prescribing information]] and in nursing references accordingly treat expulsion of air before the dose is measured as a defined step, and treat the graduation as valid only for a gas-free barrel and hub.{{r|who2015}} |