A 29-gauge atraumatic needle for amniocentesis

Abstract

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.

Three years’ experience of using a 29-gauge atraumatic needle for amniocentesis

“…The tip of 29-G needle not only perforates but also displaced two layers of the chorioamniotic membrane and causes fewer traumas to the fetal membranes and the uterine wall, which may reduce the probability of a hemorrhage, as shown by the results of an earlier study [15] . It was shown in vitro that the hole in the fetal membranes, after being punctured with the 29-G needle, is 36 times smaller than the hole produced using a 22-G needle.…”

“…It was shown in vitro that the hole in the fetal membranes, after being punctured with the 29-G needle, is 36 times smaller than the hole produced using a 22-G needle. Amniotic fl uid loss is as much as 61 times less intensive [15] .…”

Conventional 22- and 20-gauge needle for second trimester amniocentesis: A comparison of short term outcomes

“…However, this is not supported by at least one study that reported more intrauterine (intra-amniotic) bleeding with needles of smaller size ( 2 ) . Moreover, investigations that included very small-gauged needles such as 29 G reported difficulties during myometrial passage and membrane puncture as the primary drawback ( 8 , 14 ) . Although there are some data on the cost effectiveness of karyotype analysis, needle costs have not been included in previous studies ( 12 ) .…”

“…All women in both arms of the study underwent the standard of care technique under transabdominal sonographic guidance with free hand insertion of the needle into the amniotic cavity ( 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ) . Approximately 1 mL/gestation week of amniotic fluid was aspirated.…”

Análise dos resultados dos procedimentos invasivos para estudo do cariótipo fetal

“…Como resultado adverso, há sete perdas fetais (das quais quatro apresentam perda de líquido amniótico), outras seis também apresentam perda de líquido, mas evoluem para parto a termo (116) . (125) .…”