A New Very Low Friction Trocar to Increase Surgical Precision and Improve Aesthetics in Minilaparoscopy

GUSTAVO L CARVALHO, MD PhD, DIEGO L LIMA, STUDENT, ADRIANO C SALES, STUDENT, JOSÉ SÉRGIO N SILVA, STUDENT, FLAVIO AUGUSTO M FERNANDES JUNIOR, MD. University of Pernambuco, School of Medicine, Hospital Oswaldo Cruz, Recife – Brazil

1. Objective of the technology or device: The trocar was designed in order to increase the precision of movement and decrease surgical stress during minilaparoscopic(3mm) procedures. By noticeably reducing the friction forces between the trocar and the mini instruments we hypothesized that 1.) Movement and dislocation of the trocar in the skin could be decreased and consequently wound healing and cosmetic outcome would be better 2.) Precision of movements during dynamic surgical tasks (e. g. suturing) would be improved resulting in less stress to the surgeon and potentially shorter operating time. In addition to greatly decrease the possibility of inadvertently the trocar leaving skin orifice damaging it even more after several removals and re-insertions.2. Description of the technology and method of its use orapplication: The trocar is made by Karl Storz GmbH, Tuttlingen, Germany with very little technical tolerances and matching exactly the size of the corresponding 3mm instruments. Free left lumen is minimal, therefore eliminating the need for additional sealing or valve system to prevent gas loss. The trocar consists of an outside part such as a needle, but longer than the traditional minilaparoscopic trocars. Its insert fitsit very firmly with a LUER LOCK connector type.3. Preliminary results if available: Gas leak per trocar during lab tests was 0.2L/min in average for a pressure of 12 mmHG. During a minilaparoscopic chole procedure gas leak was 1.5L/Min (for all 3 mini trocars, average video time 26min, average gas use 39L, pressure 12 mmHg. When comparing with standard minilaparoscopic trocars, withvalve and seal, whose friction forces are 2.55N, the new trocar showed a great decrease and average friction was only 0.13N, while the standard 6mm trocar is 3.9N, for non insulated instruments.4. Conclusions/Future directions: The trocar has shown minimized friction and acceptable gas loss in the lab test. In comparison to a lap chole performed with standard size instruments, gas loss with the new design is even less. The trocar design principle holds the potential to be a valuable contribution to minilaparoscopic and standard size laparoscopic procedures without increasing cost.


Session: Emerging Technology Poster
Program Number: ETP077
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