Tyfoon Nebulizers are concentric ICP nebulizers made by  EPOND SA,  Switzerland.

- now available made of quartz and HF-resistant fluoropolymer -

They have a Laval-type nozzle at the tip of the nebulizer - where the primary aerosol is produced,
giving a more complete nebulization at higher sample flow rates ...

This picture shows a   Tyfoon   ... and lists its key advantages when used as an ICP-OES or ICP-MS nebulizer.

The advantages of the Laval-type nozzle with ICP nebulizers were first demonstrated over 20 years ago, by 2 Chinese researchers  -
 Chen Shuyin and Lu Yunlong ... cf : Spectrochimica Acta,  Vol. 43B,  No. 3,  pp. 287-291, (1988).