High-Frequency Surgery

Hug, Bernhard; Haag, R

doi:10.1007/978-3-540-74658-4_34

Cited by 1 publication

(1 citation statement)

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“…However, the influence of intestine ischemia seems unclear. As researches indicate the sensitive frequency for cerebral ischemia monitoring is 6kHz or 8kHz, we temporarily assume the results are not affected considerably by ischemia because the frequency of electrosurgical devices is much higher than that (Hug and Haag, 2011). So far, the nonlinear effects of impedance caused by hyperthermia are not involved because frequency-domain bio-impedance of fused colon are studied instead of real-time heating process.…”

Section: Discussionmentioning

confidence: 99%

Predicting burst pressure of radiofrequency-induced colorectal anastomosis by bio-impedance measurement

Zhao¹,

Zhou²,

Song³

et al. 2017

Physiol. Meas.

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The present study investigates the relationship between bio-impedance and burst pressure of colorectal anastomosis created by radiofrequency (RF)-induced tissue fusion. Colorectal anastomosis were created with ex vivo porcine colorectal segments, during which 5 levels of compression pressure were applied by a custom-made bipolar prototype, with 5 replicate experiments at each compression pressure. Instant anastomotic tensile strength was assessed by burst pressure. Bio-impedance of fused tissue was measured by Impedance Analyzer across frequency that 100 Hz to 3 MHz. Statistical analysis shows only a weak correlation between bio-impedance modulus and burst pressures at frequency of 445 kHz ( ρ s = −0.426, P = 0.099 > 0.05). In contrast, results demonstrated a highly significant negative correlation between reactance modulus and burst pressures ( ρ s = −0.812, P = 0.000 < 0.05). The decrease in mean reactance modulus with increasing burst pressures was highly significant (P = 0.019 < 0.05). The observed strong negative correlation between reactance modulus and burst pressures at frequency of 445 kHz indicates that reactance is likely to be a good index for tensile strength of RF-induced colorectal anastomosis, and should be considered for inclusion in a feedback loops in devices design. Institute of Physics and Engineering in Medicine3 Contribute equally.

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Section: Discussionmentioning

confidence: 99%