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A modular magnetic anastomotic device for minimally invasive digestive anastomosis: proof of concept and preliminary data in the pig model

Abstract

Background

The aim of our study was to assess the feasibility of minimally invasive digestive anastomosis using a modular flexible magnetic anastomotic device made up of a set of two flexible chains of magnetic elements. The assembly possesses a non-deployed linear configuration which allows it to be introduced through a dedicated small-sized applicator into the bowel where it takes the deployed form. A centering suture allows the mating between the two parts to be controlled in order to include the viscerotomy between the two magnetic rings and the connected viscera.

Methods and procedures

Eight pigs were involved in a 2-week survival experimental study. In five colorectal anastomoses, the proximal device was inserted by a percutaneous endoscopic technique, and the colon was divided below the magnet. The distal magnet was delivered transanally to connect with the proximal magnet. In three jejunojejunostomies, the first magnetic chain was injected in its linear configuration through a small enterotomy. Once delivered, the device self-assembled into a ring shape. A second magnet was injected more distally through the same port. The centering sutures were tied together extracorporeally and, using a knot pusher, magnets were connected. Ex vivo strain testing to determine the compression force delivered by the magnetic device, burst pressure of the anastomosis, and histology were performed.

Results

Mean operative time including endoscopy was 69.2 ± 21.9 min, and average time to full patency was 5 days for colorectal anastomosis. Operative times for jejunojejunostomies were 125, 80, and 35 min, respectively. The postoperative period was uneventful. Burst pressure of all anastomoses was ≥110 mmHg. Mean strain force to detach the devices was 6.1 ± 0.98 and 12.88 ± 1.34 N in colorectal and jejunojejunal connections, respectively. Pathology showed a mild-to-moderate inflammation score.

Conclusions

The modular magnetic system showed enormous potential to create minimally invasive digestive anastomoses, and may represent an alternative to stapled anastomoses, being easy to deliver, effective, and low cost.

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Acknowledgements

The authors are grateful to Guy Temporal and Christopher Burel for proofreading the manuscript.

Disclosures

Michele Diana is the recipient of a research grant from Karl Storz (Tuttlingen, Germany) and is the inventor of the modular magnetic anastomotic device. Jacques Marescaux is the recipient of grants from Karl Storz (Tuttlingen, Germany), Siemens Healthcare, and Covidien. Didier Mutter, Véronique Lindner, Michel Vix, Hyunsoo Chung, and Nicolas Demartines have no conflicts of interest or financial ties to disclose.

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Correspondence to Michele Diana.

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Diana, M., Mutter, D., Lindner, V. et al. A modular magnetic anastomotic device for minimally invasive digestive anastomosis: proof of concept and preliminary data in the pig model. Surg Endosc 28, 1613–1623 (2014) doi:10.1007/s00464-013-3360-2

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Keywords

  • Magnetic anastomosis
  • Compression anastomosis
  • Sutureless anastomosis
  • Modular Auto-Assembling Magnetic Anastomotic System
  • MAGNAMOSIS®
  • Minimally invasive digestive surgery
  • Flexible anastomotic system