The effect of needle dimensions and infusion rates on injection pressures in regional anaesthesia needles: a bench-top study
| Autor: | J. J. Patil, S. Ford, Damien J. Williams, C. Egeler |
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| Rok vydání: | 2014 |
| Předmět: |
Syringe driver
medicine.medical_specialty business.industry Syringes Regional anaesthesia Equipment Design Pressure sensor Surgery Volumetric flow rate Injections Anesthesiology and Pain Medicine Pressure monitors Anesthesia Conduction Needles High pressure medicine Pressure business Rheology Tip position Syringe Infusion Pumps Biomedical engineering |
| Zdroj: | Anaesthesia. 70(2) |
| ISSN: | 1365-2044 |
| Popis: | Animal studies have shown that injection pressures > 75 kPa indicate probable intrafascicular needle tip position. This study describes the flow/pressure characteristics of seven common needle systems. A syringe pump delivered flow rates of 5, 6.67, 10, 13.3, 15 and 20 ml.min(-1) through these needle systems, while keeping the needle tips open to atmosphere. A pressure transducer connected between the syringe and needle provided a real-time graphical display for analysis. Mean plateau pressures increased linearly with flow and with decreasing needle diameter (2.7-92 kPa). Flow rates > 17 ml.min(-1) and needle sizes 22 G and smaller produced mean plateau pressures > 75 kPa. Pressure monitors upstream from the needle may produce false-positive alarms at high flow rates due to needle resistance, and unreliable readings due to non-laminar flow. We recommend injection rates ≤ 15 ml.min(-1) (0.25 ml.s(-1) ) to reduce the effect of factors upstream from the needle tip as a cause of high pressure readings. |
| Databáze: | OpenAIRE |
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