Low-cost reusable instrumentation for laparoendoscopic single-site nephrectomy : assessment in a porcine model

Abstract

Purpose: To test different sets of prebent instruments and a new reusable access device for laparoendoscopic single-site (LESS) surgery. Materials and Methods: Three surgeons with previous experience in LESS performed 12 nephrectomies in six pigs. In all procedures, a multichannel access device (X-CONE_) and a 5-mm extra-long telescope were used. Four sets of prebent instruments with different profiles (S-portal_) were tested: Standard (one straight scissorsand one curved grasper), Cuschieri, Carus, and Leroy set (each of them consisting of two curved instruments with different configurations). Assessment was performed based on both objective (procedure time; time to manage the pedicle; time to free kidney) and subjective parameters (entry=exit of instruments; triangulation; dissection up=down; dissection lateral; retraction; interdependence). The subjective assessment tool used was a Likert type scale (1¼easy to 5¼prohibitive). The access device was assessed by using objective (time to completeinsertion of device after skin incision) and subjective (significant air leakage, movement constraint) parameters. Results: Time to insertion of the X-CONE was <1 minute in all the cases. Surgeons reported significant insufflant leakage in 58% of cases. The procedure was completed in 10=12 (83%) cases. Mean operative time was 8.3_4.2 minutes, being lower for the Carus group (4.5 min) and higher for the standard group (13 min). Among thedifferent sets, the standard one obtained the best mean scores for all subjective parameters. Conclusions: X-CONE allows easy abdominal access, and its reusable properties represent cost savings for LESS compared with disposable devices. Prebent instruments might also represent attractive low-cost tools for LESS.