Small Bowel Endoscopic, Dallas Procedures


The proximal small bowel plays an important role in glucose homeostasis. Therefore, small bowel EBMTs may contribute to weight loss as well as diabetes improvement.

Analogues of Roux-en-Y Gastric Bypass (RYGB)

RYGB was developed by Mason and Ito in 1967. Since then, the procedure has undergone several technical modifications and has been a preferred bariatric procedure for the past several decades. During RYGB, the stomach is divided into a 20–30 mL pouch and a larger remnant stomach.
There have been three Endoscopic, Dallas devices that attempt to mimic elements of RYGB. These are Endoluminal Bypass, EndoBarrier and Duodenal Mucosal Resurfacing.

Endoluminal Bypass

The Endoluminal Bypass is a 120 cm sleeve secured at the gastroesophageal (GE) junction to create an endoluminal gastro-duodeno-jejunal bypass that mimics the permanent anatomical changes of RYGB. The company is currently planning a U.S. trial.

EndoBarrier

The EndoBarrier (GI Dynamics Inc., Lexington, MA), also known as duodenal-jejunal bypass sleeve (DJBS), is a 60 cm fluoropolymer sleeve that is anchored at the duodenal bulb and terminates at the proximal jejunum.

Duodenal Mucosal Resurfacing

Duodenal Mucosal Resurfacing (DMR) (Fractyl Laboratories, Cambridge, MA), or the Revita procedure, is an Endoscopic, Dallas procedure that applies radiofrequency to thermally ablate the superficial duodenal mucosa .
 Currently, a multi-center study is being conducted in Europe and a U.S. pivotal trial is planned.

Analogue of Variant Biliopancreatic Diversion-Duodenal Switch (BPD-DS)

Biliopancreatic diversion (BPD) was first described by Scopinaro in 1979. It consists of a horizontal gastrectomy, which leaves an upper stomach that is connected to the distal 250 cm small intestine.
The Incisionless Anastomotic System (IAS) is used to create an enteral diversion that is functionally similar to the variant DS procedure and mechanistically similar to ileal transposition.

Incisionless Anastomotic System (IAS)

IAS (GI Windows, Boston, MA) creates an anastomosis via incisionless magnetic compression. This technology has many applications including a bariatric dual-path enteral diversion procedure.

Other Small Bowel Procedures

SatiSphere

SatiSphere (Endosphere, Columbus, OH) consists of a nitinol memory wire with two pigtals at each end, and several polyethylenterephtalat spheres along the wire.

Conclusion

EBMTs have the potential to transform the treatment of obesity, which remains a growing pandemicFurthermore, as obesity is a chronic disease, these less invasive and reversible options may allow sequential therapy to more optimally manage this condition in the long-term.



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