Syringe dead space: difference between revisions
Diff·revision 13 → 14·22:45, 14 Dec 2025
Difference between revision 13 and revision 14 of Syringe dead space. 7 lines changed; the page grew by 261 bytes.
| Revision 13 — 01:08, 3 Dec 2025 GramsNotUnitsGil (talk) add the shelf life after first puncture, attributed 15,428 bytes +2,627 | Revision 14 — 22:45, 14 Dec 2025 SubQ_Solveig (talk) expand §Measured and computed magnitudes 15,689 bytes +261 | ||
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| 94 | 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 | 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}} |
| 95 | 95 | ||
| + | 96 | | Device dead space | Volume consumed per 0.20 mL dose | Full doses from 2.00 mL | Loss against nominal | | |
| + | 97 | |---|---|---|---| | |
| + | 98 | | 0.005 mL | 0.205 mL | 9 | 10% | | |
| + | 99 | | 0.020 mL | 0.220 mL | 9 | 10% | | |
| + | 100 | | 0.070 mL | 0.270 mL | 7 | 30% | | |
| + | 101 | | 0.100 mL | 0.300 mL | 6 | 40% | | |
| + | 102 | ||
| 96 | === Priming and air management === | 103 | === Priming and air management === |
| 97 | 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}} | 104 | 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}} |