Impact of Experience on Results With the Third Eye Retroscope


Avantis Medical Systems




Colorectal Neoplasms


Device: Third Eye Retroscope

Study type


Funder types



Avantis TER 08-07

Details and patient eligibility


The Third Eye Retroscope is a device that can be used with a colonoscope to improve the ability of a physician to see areas of the colon that may be hidden from the view of the colonoscope. Previous studies have shown that physicians are able to detect additional polyps when they use the device along with the colonoscope. The purpose of this study is to determine whether physicians can detect greater numbers of additional polyps as they gain in experience with the device.

Full description

Purpose: This study is intended to determine characteristics of the "learning curve" for use of the Third Eye Retroscope during colonoscopy, both in terms of efficacy for detection of abnormalities in the colon and time-efficiency for endoscopists Device Description: The Third Eye Retroscope is an auxiliary imaging device that is designed to allow visualization of "hidden areas" during colonoscopy by providing an additional, retrograde view that complements the forward view of the colonoscope. After a standard colonoscope has been advanced to the cecum, the Third Eye Retroscope is inserted through the instrument channel of the colonoscope. As it emerges from the distal tip of the colonoscope, the Third Eye Retroscope automatically bends 180 degrees to form a "J" shape. Its sensor then provides a continuous retrograde view of the colon throughout the process of withdrawal of the colonoscope. The retrograde view assists the endoscopist in visualizing the proximal aspect of haustral folds and rectal valves, as well as the areas behind flexures and the ileocecal valve. With this additional point-of-view, the endoscopist may be able to detect lesions that can be missed by the forward-viewing colonoscope. Study Design: Patients who are scheduled for colonoscopy will be recruited to the study and examined with the Third Eye Retroscope in conjunction with a standard colonoscope. For each polyp that is found, the endoscopist will indicate whether it could be seen with the colonoscope, or if it could be found with the colonoscope only because it was first detected with the Third Eye. Each investigator will perform colonoscopies on 20 patients, who will be segmented into four quartiles according to the order of their procedures. Mean results for the quartiles will be compared in order to evaluate the learning curve for Third Eye colonoscopy.


328 patients




Accepts Healthy Volunteers

Inclusion criteria

  • The patient is undergoing colonoscopy for screening, for surveillance in follow-up of previous polypectomy or for diagnostic workup;
  • The patient must understand and provide written consent for the procedure.

Exclusion criteria

  • Patients with a history of colonic resection;
  • Patients with inflammatory bowel disease;
  • Patients with a personal history of polyposis syndrome;
  • Patients with suspected chronic stricture potentially precluding complete colonoscopy;
  • Patients with diverticulitis or toxic megacolon;
  • Patients with a history of radiation therapy to abdomen or pelvis.
  • Patients who are currently enrolled in another clinical investigation in which the intervention might compromise the safety of the patient's participation in this study.

Trial design

Primary purpose




Interventional model

Single Group Assignment


None (Open label)

328 participants in 1 patient group

Third Eye Retroscope
Experimental group
All subjects underwent the same intervention, consisting of examination of the colon using a colonoscope along with the Third Eye Retroscope device, with removal of any polyps that were detected during the procedure.
Device: Third Eye Retroscope

Trial contacts and locations



Data sourced from

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