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A 29-gauge atraumatic needle for amniocentesis
-
Michael Tchirikov
,
Georgios Gatopoulos
Published/Copyright:
May 31, 2011
Abstract
Objective: To compare perforation characteristics of standard 22 G (0.7 mm) to 29 G needle (0.34 mm) for amniocentesis.
Methods: Seventeen human chorio-amnion membranes were perforated immediately after cesarean section using 22 G needle for spinal anesthesia and 29 G “pencil-point” needles for amniocentesis under in-vitro conditions. Area of perforation was determined using a microscope and volume of fluid leakage was measured over a period of 5 min.
Results: Membrane perforation with the 22 G needle resulted in a mean damaged area of 225,147.4 μm2, a hole with a mean area of 50,154 μm2 and amniotic fluid volume passage of 17.5 mL/5 min, whereas the 29 G needle generated a mean damaged area of 114,812.4 μm2, a hole with an average area of 1382.5 μm2 and volume passage of 0.28 mL/5 min. These differences were significant.
Conclusion: The hole formed by membrane perforation with 29 G “pencil-point” needle for amniocentesis is 36 times smaller, and the amniotic fluid loss is 61 times less than that measured with the 22 G standard needle for spinal anesthesia. Significant reduction of complications following amniocentesis is expected with the 29 G needle.
Received: 2010-8-24
Revised: 2011-1-12
Accepted: 2011-2-4
Published Online: 2011-05-31
Published Online: 2011-06-1
Published in Print: 2011-07-01
©2011 by Walter de Gruyter Berlin Boston
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