Click pen applicator device and method of using same

1. A device for dispensing a formulation comprising:

a centerband having a proximal end and a distal end and defining a storage section having the formulation disposed within;

an applicator section situated at the distal end of the centerband; and

a multistage actuator section situated at the proximal end of the centerband for rapid priming with a click dispensing mechanism with a piston seat having two sets of external threads on a shaft with an unthreaded length therebetween.

2. The device according to claim 1 , wherein the multistage actuator section comprises:

a spiral having internal threads configured to engage with the external threads of the piston seat; and

a priming spring operatively engaged between the piston seat and the spiral.

3. The device according to claim 2 , wherein the two sets of external threads of the piston seat have a same pitch.

4. The device according to claim 2 , wherein a first set of the two sets of external threads includes a length shorter than that of a second set of the two sets of external threads.

5. The device according to claim 2 , wherein a pitch of a second set of the two sets of external threads is configured to dispense a discrete dose with each dispensing actuation.

6. The device according to claim 2 , wherein the priming spring is configured to expand over the unthreaded length of the piston seat when the internal threads of the spiral do not engage the external threads of the piston seat.

7. The device according to claim 2 , wherein the multistage actuator section further comprises:

a cup attached to a distal end of the piston seat;

a seal between the cup and the proximal end of the centerband;

a gear operatively engaged with the shaft of the piston seat;

a click spring operatively disposed between the gear and the spiral; and

a spiral sleeve and a push button operatively engaged with the gear, the push button having a locking element.

8. The device according to claim 7 , wherein the applicator section comprises:

a passing seat attached to the distal end of the centerband;

a seal between the passing seat and the distal end of the centerband;

an orifice reducer situated inside the passing seat;

a nose attached to a distal end of the passing seat; and

a cap attached to the distal end of the centerband.

9. The device according to claim 8 , wherein the cap includes a pintel configured to seal at least one of the nose and the passing seat of the applicator section.

10. The device according to claim 8 , wherein the seal between the cup and the proximal end of the centerband is an o-ring, and the seal between the passing seat and the distal end of the centerband is an o-ring.

11. The device according to claim 1 , wherein the formulation comprises salicylic acid.