Spray nozzle chip and a medicament delivery device comprising the same

A spray nozzle chip comprising:

• a first layer provided with a first layer orifice;
• and
• a mechanically flexible nozzle layer provided with a nozzle orifice,
• wherein the first layer has a valve seat arranged to be aligned with the nozzle orifice, wherein the spray nozzle chip has a valve functionality obtained by movement of the nozzle layer relative to the valve seat due to pressure changes,
• wherein the nozzle layer is arranged at a distance from the valve seat when the nozzle layer is in a default non-pressurised state, whereby a gap with a gap length (L) is formed between the nozzle layer and the valve seat,
• wherein a valve seat intermediate layer is between the nozzle layer and the valve seat,
• wherein the first layer and the nozzle layer are connected by means of an intermediate layer, such that the valve seat intermediate layer is thicker than the intermediate layer,
• wherein the valve seat intermediate layer comprises a bonding layer,
• wherein the bonding layer is a Parylene, and
• wherein the bonding layer is configured to rupture when a liquid product is pressurised for a first delivery of an aerosol through the spray nozzle chip.