title: Tissue compression analysis for magnetically anchored cautery dissector during single-site laparoscopic cholecystectomy.
abstract: BACKGROUND
  The purpose of this study was to evaluate the histological effects of dynamic abdominal wall compression using the magnetic anchoring and guidance system (MAGS) platform.
  
  
  METHODS
  Cholecystectomy was performed in two nonsurvival and two survival pigs using a single-site laparoscopic (SSL) approach. A deployable MAGS cautery dissector was used to perform the entire dissection in conjunction with a laparoscope and other instruments. The abdominal wall areas corresponding to the region occupied by the MAGS platform were examined grossly and microscopically for signs of tissue damage. Gallbladder dissection time was 36 min with no complications. Compressed abdominal wall thickness was 1.4 cm.
  
  
  RESULTS
  In all four animals, a very mild skin erythema was noted immediately postprocedure but was nonvisible within 20 min. Mild peritoneal blanching was noted in two animals, and one animal exhibited a 5-mm area of petechiae. Necropsy demonstrated no adhesions. Light microscopy documented no evidence of tissue injury for all specimens.
  
  
  CONCLUSIONS
  This study demonstrated that the use of the MAGS cautery dissector for a SSL cholecystectomy was advantageous in providing triangulation and did not result in any significant gross or microscopic tissue damage despite the thin abdominal wall of the porcine model.
authors.affiliation: Southwestern Center for Minimally Invasive Surgery, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390-9156, USA.
authors.forename: Lauren B
authors.initials: LB
authors.lastname: Mashaud
authors.forename: Wareef
authors.initials: W
authors.lastname: Kabbani
authors.forename: Angel
authors.initials: A
authors.lastname: Caban
authors.forename: Sarah
authors.initials: S
authors.lastname: Best
authors.forename: Deborah C
authors.initials: DC
authors.lastname: Hogg
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Cadeddu
authors.forename: Richard
authors.initials: R
authors.lastname: Bergs
authors.forename: Heather
authors.initials: H
authors.lastname: Beardsley
authors.forename: Raul
authors.initials: R
authors.lastname: Fernandez
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Scott
mesh_terms: D034861:Abdominal Wall; D000818:Animals; D017081:Cholecystectomy, Laparoscopic / Q000009:adverse effects* / Q000295:instrumentation*; D004867:Equipment Design; D020706:Laparoscopes / Q000009:adverse effects*; D008280:Magnetics; D013523:Surgical Equipment / Q000009:adverse effects*; D013552:Swine