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Table 2 Residual heat: time to safety classified by effect and cutting interval

From: Temperature profile and residual heat of monopolar laparoscopic and endoscopic dissection instruments

Instrument Position Time to safety (50 °C) in s
By effect
Mean ± standard deviation
p value Time to safety (50 °C) in s
By cutting cycle
Mean ± standard deviation
p value
Modus: preciseSect laparoscopic dissection Cutting duration in s
Effect 5 Effect 7 Effect 10 1 s 3 s 5 s 10 s
L-Hook Laparoscopy Tip 15.2 ± 7.9 34.4 ± 5.5 35.8 ± 5.6  < 0.001 22.6 ± 11.5 26.4 ± 15.0 30.4 ± 11.6 31.5 ± 6.7 0.49
0 mm 15.8 ± 7.6 34.3 ± 4.4 34.8 ± 5.0  < 0.001 23.1 ± 11.1 26.4 ± 14.4 30.1 ± 10.1 30.9 ± 5.6 0.52
5 mm 17.0 ± 8.9 36.4 ± 6.1 36.7 ± 7.3  < 0.001 22.9 ± 12.8 30.7 ± 13.5 31.3 ± 12.6 34.1 ± 6.8 0.35
10 mm  < 50 °C 33.8 ± 8.2 32.9 ± 8.2 0.85 33.1 ± 13.4 33.9 ± 5.1 32.2 ± 12.9 33.8 ± 8.1 0.99
   Modus: EndoCutQ p value Cutting duration in s p value
Effect 3 Effect 4 1 s 3 s 5 s 10 s
Triangle Tip Knife Endoscopy Tip 2.8 ± 1.1 3.5 ± 0.8 0.08 3.3 ± 0.3 2.4 ± 0.8 3.6 ± 1.0 3.4 ± 1.2 0.14
0 mm 0.9 ± 0.8 1.7 ± 2.3 0.69 0.8 ± 0.8  < 50 °C 1.0 ± 1.2 1.7 ± 2.3 0.90
5 mm  < 50 °C  < 50 °C NA  < 50 °C  < 50 °C  < 50 °C  < 50 °C NA
10 mm  < 50 °C  < 50 °C NA  < 50 °C  < 50 °C  < 50 °C  < 50 °C NA
Dual Tip Knife Endoscopy Tip 2.0 ± 0.9 1.9 ± 0.5 0.64 1.3 ± 0.1 1.9 ± 0.5 2.7 ± 0.8 2.4 ± 0.8 0.024
0 mm 1.5 ± 1.2 2.0 ± 1.4 0.34 0.2 ± 0.2 1.3 ± 0.7 2.5 ± 1.2 2.7 ± 0.9  < 0.001
5 mm  < 50 °C  < 50 °C NA  < 50 °C  < 50 °C  < 50 °C  < 50 °C NA
10 mm  < 50 °C  < 50 °C NA  < 50 °C  < 50 °C  < 50 °C  < 50 °C NA
Hook Tip Knife Endoscopy Tip 2.6 ± 1.0 2.1 ± 0.3 0.15 2.1 ± 0.6 2.1 ± 0.6 2.7 ± 1.2 2.6 ± 1.0 0.59
0 mm 0.2 ± 0.2 0.3 ± 0.3 0.52  < 50 °C 0.6 ± 0.3 1.2 ± 0.5 1.0 ± 0.2 0.39
5 mm  < 50 °C  < 50 °C NA  < 50 °C  < 50 °C  < 50 °C  < 50 °C NA
10 mm  < 50 °C  < 50 °C NA  < 50 °C  < 50 °C  < 50 °C  < 50 °C NA
  1. Bold text highlights a p < 0.05
  2. Time to safety was defined as the time the instrument needed to cool down to < 50 °C after energy application. Statistical significance was calculated using the Mann–Whitney-U-test/Wilcoxon-test for two groups and the test for analysis of variance (ANOVA) for comparing means of more than two groups
  3. NA not available as 50 °C have not been exceeded