Spray device and method

A spray device, comprising:

• a tubular barrel having an internal surface, opposed first and second open ends and a bypass between said first and second open ends, a spray nozzle member on said second open end of said tubular barrel including an internal surface and a spray port, first, second and third stoppers located within said tubular barrel each having an external surface engaging said internal surface of said tubular barrel and moveable in said tubular barrel, said first stopper initially located adjacent said first open end of said tubular barrel, said second stopper spaced from said first stopper and initially located between said first stopper and said bypass of said tubular barrel and said third stopper having a body portion located between said bypass and said second open end of said tubular barrel, a fluid located between said first and second stoppers and a substance located between said second and third stoppers, whereby movement of said first stopper toward said second open end of said tubular barrel moves said second stopper to adjacent said bypass causing said fluid to flow between said first and second stoppers through said bypass, mixing said fluid between said first and second stoppers with said substance between said second and third stoppers, continued movement of said first stopper then drives said first stopper against said second stopper and continued movement of said first and second stoppers drives said third stopper toward said spray nozzle member to establish fluid communication of the mixture between said second stopper and said third stopper and said spray port creating a spray of said mixture for delivery of said mixture to a patient.

A method of delivering a fine spray of a medical substance to a patient with a spray device including a tubular barrel having first and second open ends and a bypass spaced between said first and second open ends, a spray nozzle on said second open end having a spray port, first and second stoppers located within said tubular barrel each having an external surface sealingly engaging an internal surface of said tubular barrel and moveable in said tubular barrel, said first stopper initially located adjacent said first open end and said second stopper located between said first stopper and said bypass, a fluid located between said first and second stoppers and a substance located between said second stopper and said second open end of said tubular barrel, said method comprising the following steps:

• driving said first stopper toward said second stopper until said second stopper reaches said bypass;
• continuing to drive said first stopper toward said second stopper thereby causing said fluid to flow through said bypass and mix with said substance until said first stopper engages said second stopper;
• and
• continuing to drive said first stopper toward said spray nozzle, thereby causing the mixture of fluid and substance to flow through said spray port of said spray nozzle, thereby creating a spray of the mixture of the fluid and substance for application to a patient.