#$%^&*AU2010226929B220140724.pdf#####Prevention of Premature Gelling of Delivery Devices for pH Dependent Forming Materials Abstract s The present disclosure provides treatment of an apparatus, in embodiments a delivery device, which prevents premature gelling of any materials or precursor(s) of a pH dependent forming material, in embodiments a hydrogel, dispensed by the delivery device. The pH microenvironment near the surface of a lumen of the device, in embodiments the tip of a spray applicator through which the material to be dispensed is 1o expelled from the device, may be controlled to prevent premature gelling.1/8 8
