This is a clinical trial assessing the feasibility of the Napoleon device for measuring the gastrojejunal anastomosis (GJA). The study population is Roux-en-Y gastric bypass (RYGB) patients with weight regain undergoing an endoscopy at Bellevue Hospital Center or Brigham and Women's Hospital. investigators aim for a sample size of up to 100 cases. For each case, endoscopists will first visually estimate the diameter of the GJA by comparing its size to the upper endoscope. Then, they will measure the GJA with Napoleon. Investigators will compare the GJA measurements performed using visual estimation and Napoleon. A survey will be given to all endoscopists to assess the level of ease using Napoleon.

Inclusion Criteria:

In order to be eligible to participate in this study, an individual must meet all of the following criteria:

1. RYGB patient with weight regain age 18-90
2. Scheduled for an endoscopy
3. Willingness and ability to provide informed consent

Exclusion Criteria:

An individual who meets any of the following criteria will be excluded from participation in this study:

1. History of prior endoscopies with complications

The de-identified participant data from the final research dataset used in the published manuscript will be shared upon reasonable request beginning 9 months and ending 36 months following article publication or as required by a condition of awards and agreements supporting the research provided the investigator who proposes to use the data executes a data use agreement with NYU Langone Health. Requests may be directed to: Violeta.Popov@nyulangone.org. The protocol and statistical analysis plan will be made available on Clinicaltrials.gov only as required by federal regulation or as a condition of awards and agreements supporting the research.

beginning 9 months and ending 36 months following article publication or as required by a condition of awards and agreements

Requests may be directed to: Violeta.Popov@nyulangone.org.