Bench-top testing of suction forces generated through endoscopic ultrasound-guided aspiration needles.
J Hepatobiliary Pancreat Sci
; 22(5): 379-85, 2015 May.
Article
em En
| MEDLINE
| ID: mdl-25557010
BACKGROUND: Adequate needle size and tissue acquisition techniques for endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) need further elucidation. Moreover, the actual negative pressure and suction forces of FNA needles remain unknown. We evaluated the suction forces of 19-gauge, 22-gauge, and 25-gauge conventional FNA needles and side hole aspiration needles using conventional negative pressure and the slow pull technique. METHODS: Using a manometer, we determined the mean (SD) negative pressure and suction force for needle gauge, aspiration volume, and aspiration technique. We also evaluated the time to reach the maximum negative pressure. RESULTS: Suction force was comparatively higher in the 19-gauge needle when 50 ml of negative pressure was applied. Suction force using the slow pull method was very weak at 5% of pressure found with conventional methods. With the use of a 20-ml syringe, the time to reach the maximum negative pressure was 4 s in the 19-gauge needle, 11 s in the 22-gauge needle, and 80 s in the 25-gauge needle. CONCLUSIONS: Bench-top testing showed that suction force increases with a larger gauge needle and larger aspiration volume. The slow pull method produces a very weak suction force. The time to reach the maximum negative pressure was longest in the 25-gauge needle.
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MEDLINE
Assunto principal:
Aspiração por Agulha Fina Guiada por Ultrassom Endoscópico
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article