Published online Apr 27, 2020. doi: 10.4240/wjgs.v12.i4.138
Peer-review started: December 21, 2019
First decision: January 15, 2020
Revised: January 21, 2020
Accepted: March 25, 2020
Article in press: March 25, 2020
Published online: April 27, 2020
The most serious adverse event of colonic stenting is perforation. The Niti-S D type stent could be ideal to reduce risk of perforation due to its structure with weaker axial force. Stents are deployed using a standard colonoscope, which can pose a challenge while overcoming sharp angles. Smaller caliber colonoscopes could be ideal for easy maneuverability, facilitating scope advancement and cecal intubation where the standard colonoscope has failed. The main drawback of using small caliber colonoscope is its small channel of 9.2 mm, that would only allow 9Fr delivery catheter available only with stents of diameter 18 mm that has less radial force to overcome obstruction. Stents with greater radial force are 22 mm that require larger channel standard colonoscope.
We would like to develop a new colonic stent that maintains the structure with low axial force of the conventional Niti-S D type and takes additional radial force with 22-mm diameter, but that requires 9Fr delivery system, hence can be deployed using smaller caliber colonoscope.
We evaluated the efficacy and safety of the newly developed “Niti-S MD type” colonic stent.
This single-center retrospective observational study with endoscopic self-expandable metallic stents placed between November 2011 and December 2018, and we evaluated the short-term outcomes including success rates and adverse events.
The technical and clinical success rate of the Niti-S MD type was 100%, and its perforation rate was 0%.
Our preliminary data suggested that the newly developed “Niti-S MD type” colonic stent was feasible and safe.
The stent might have a potential to be an ideal one that offers high radial force and can be deployed with small caliber colonoscope. Larger prospective studies and randomized comparison trials are warranted to evaluate and compare this new stent with available conventional colonic stents.