Trocar-less instrumentation for laparoscopy

Magnetic positioning of intra-abdominal camera and retractor

Sangtae Park, Richard A. Bergs, Robert Eberhart, Linda A Baker, Raul Fernandez, Jeffrey A Cadeddu

Research output: Contribution to journalArticle

144 Citations (Scopus)

Abstract

OBJECTIVE: To develop a novel laparoscopic system of moveable instruments that are positioned intra-abdominally and "locked" into place by external permanent magnets placed on the abdomen. SUMMARY BACKGROUND DATA: In conventional laparoscopy, multiple trocars are required because of the limited degrees of freedom of conventional instrumentation, and the limited working envelope (an inverted cone) created by the fulcrum motion around each port. While robotic systems can improve the number of degrees of freedom, they are restricted by even smaller working envelopes. METHODS: A collaborative research group from the Department of Urology and the Automation & Robotics Research Institute of the University of Texas, Arlington built a prototype system of magnetically anchored instruments for trocar-less laparoscopy. The only design mandate was that the developed technology be able to pass into the abdomen through one existing 12-mm diameter trocar. RESULTS: A transabdominal "magnetic anchoring and guidance system" (MAGS) platform was developed to incorporate instruments, retractors, and a controllable intra-abdominal camera. In vitro, the platform was able to anchor 375 and 147 g across porcine tissue 1.8 and 2.5 cm thick, respectively. The permanent magnet platforms were sufficiently strong to retract the porcine liver and securely anchor the camera. Its versatility was demonstrated by moving the camera to virtually any location in the peritoneum with no working envelope restrictions and the subsequent completion of porcine laparoscopic procedures with 2 trocars only. CONCLUSIONS: Trocar-less laparoscopy using magnetically anchored instruments is feasible and may expand intracorporeal instrument manipulation substantially beyond current-day capability. The ability to reduce the number of trocars necessary for laparoscopic surgery has the potential to revolutionize surgical practice.

Original languageEnglish (US)
Pages (from-to)379-384
Number of pages6
JournalAnnals of Surgery
Volume245
Issue number3
DOIs
StatePublished - Mar 2007

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Surgical Instruments
Laparoscopy
Swine
Magnets
Robotics
Abdomen
Peritoneum
Automation
Urology
Technology
Liver
Research

ASJC Scopus subject areas

  • Surgery

Cite this

Trocar-less instrumentation for laparoscopy : Magnetic positioning of intra-abdominal camera and retractor. / Park, Sangtae; Bergs, Richard A.; Eberhart, Robert; Baker, Linda A; Fernandez, Raul; Cadeddu, Jeffrey A.

In: Annals of Surgery, Vol. 245, No. 3, 03.2007, p. 379-384.

Research output: Contribution to journalArticle

Park, Sangtae ; Bergs, Richard A. ; Eberhart, Robert ; Baker, Linda A ; Fernandez, Raul ; Cadeddu, Jeffrey A. / Trocar-less instrumentation for laparoscopy : Magnetic positioning of intra-abdominal camera and retractor. In: Annals of Surgery. 2007 ; Vol. 245, No. 3. pp. 379-384.
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