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. 2021 Apr 12;10(8):1628. doi: 10.3390/jcm10081628

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

A comparison of the outer and inner diameters of the former XEN63, new XEN63, and XEN45 devices. The former XEN63 device was inserted by using a 25G needle injector (with an outer diameter of 0.5144 mm), while the new XEN63 device is inserted by using a 27G needle injector (with an outer diameter of 0.4128 mm, which is 19.8% smaller). As compared to XEN45 implant, the outer diameter of XEN63 is only 12% greater, while the inner diameter is 1.4 times greater. Since the new XEN63 and the XEN45 devices are inserted by using a 27G injector needle, the side flow with the XEN63 is reduced compared with the XEN45.