Research has been done on the first and the second generation Gnana laryngeal airway . 

3 clinical studies on Pubmed link https://pubmed.ncbi.nlm.nih.gov/?term=gnana+laryngeal+airway+

One case report has also been published 

Mitra, Suparna; DebRoy, Debashis; Mitra, Joy; Goswami, Jyotsna

Author InformationAirway 5(1):p 57-60, Jan–Apr 2022. | DOI: 10.4103/arwy.arwy_4_22