Intranasal cartridge devices
Intranasal delivery devices include dosage forms containing medical compositions for use in the intranasal devices, and methods of delivering medical compositions to the nasal mucosa of users. The devices dispense a predetermined quantity of fluid into the nasal passage of a user, in which the predetermined quantity of fluid is contained in, or produced in a dosage form or blister that is crushed by a plunger with sufficient force to drive the dosage form against a piercing mechanism, piercing the dosage form and forcing the liquid contents from the dosage form and through a delivery channel into a spray to be directed into the nasal passage of a user. The plunger is connected to a trigger device by a linkage that confers a mechanical advantage to the trigger mechanism.
1. A device for dispensing a predetermined quantity of sterile fluid, said device comprising:
a body, and a dispensing mechanism, the dispensing mechanism comprising:
a firing button comprising an inclined surface;
a sliding member contained within the body and comprising one or more angled cam surfaces and wherein one of said angled cam members contacts said inclined surface of the firing button;
a plunger end connected to the sliding member; and
a chamber containing a crushable blister, said crushable blister comprising a piercable membrane and an internal volume, wherein said internal volume contains a piercing mechanism comprising an elongated member with one or more inlets in fluid communication with the internal volume, an internal channel and a piercing end, forming a discharge nozzle;
wherein, forcing the firing button against the cam forces the plunger end into the dispensing chamber with a mechanical advantage relative to the force applied to the firing button, crushing the blister against the piercing mechanism and dispensing the contents of the blister through the nozzle.
2. The device of claim 1 , wherein the sterile fluid comprises a liquid.
3. The device of claim 1 , wherein the sterile fluid comprises a powder.
4. The device of claim 1 , wherein the piercing mechanism comprises:
an internal channel;
one or more inlet openings arranged to force one or more bends as the fluid flows into the internal channel;
a discharge outlet; and
features in the internal channel to control the spray pattern and droplet size of a fluid forced to flow through the nozzle.
5. The device of claim 4 , wherein the features in the internal channel of the piercing mechanism comprise steps, flutes, ribs, or a combination thereof.