Medicine dispensing device
View Patent ↗Some embodiments of a wearable, disposable medicine dispensing device may include a piston rod that is advanced to dispense medicine from the device. A rotational motor may be coupled to a drive mechanism so as to carry out a certain number of revolutions and thereby displace the piston rod by a desired distance. Such a device can be used in a method of dispensing liquid medicine.
1. A wearable medicine dispensing device, comprising:
a portable housing that defines a space to receive a medicine for incremental dispensation to a user;
a piston rod being arranged in the portable housing and being movable in individual forward increments toward the medicine when the medicine is received in the space;
a drive mechanism arranged in the portable housing and coupled to the piston rod so as to longitudinally advance the piston rod in each of the individual forward increments for medicine dispensation when the medicine is received in the space;
a battery-powered, reversible motor arranged in the portable housing and coupled to the drive mechanism such that rotation of the reversible motor urges the drive mechanism to advance piston rod in each of the individual forward increments; and
wherein the drive mechanism is configured to longitudinally advance the piston rod in one of the individual forward increments in response to each motor rotation cycle including one or more full rotations of the reversible motor in a first rotational direction and one or more full rotations of the reversible motor in a second reverse rotational direction.
2. The wearable medicine dispensing device of claim 1 , wherein the drive mechanism comprises a pawl and a ratchet wheel, the pawl positioned to engage at least one of the teeth of the ratchet wheel, wherein the pawl reciprocates between a first position and a second position to incrementally rotate the ratchet wheel, wherein rotation of the ratchet wheel in a drive direction causes longitudinal advancement of the piston rod.
3. The wearable medicine dispensing device of claim 2 , further comprising at least two gears coupled between the reversible motor and the pawl.
4. The wearable medicine dispensing device of claim 3 , further comprising a rigid plate member coupled between the at least two gears and the pawl.
5. The wearable medicine dispensing device of claim 3 , wherein one or more full rotations of the rotational motor causes the pawl to pivot about an axis.
6. The wearable medicine dispensing device of claim 1 , further comprising a control circuit device that communicates signals to cause the reversible motor to repeatedly reverse the direction of rotation between the first rotational direction and the second reverse rotational direction.
7. The wearable medicine dispensing device of claim 6 , further comprises a sensor that communicates with the control circuit device to cause the rotation of the motor to be reversed from the first rotational direction to the second reverse rotational direction.
8. The wearable medicine dispensing device of claim 1 , wherein the drive mechanism comprises a drive wheel to mate with a portion of the piston rod, wherein the drive wheel is locked from rotation in a direction opposite to a forward rotation drive direction of the drive wheel.
9. The wearable medicine dispensing device of claim 8 , wherein the drive wheel comprises an internal thread configuration that engages with an outer thread configuration of the piston rod.
10. The wearable medicine dispensing device of claim 1 , wherein the piston rod comprises a flexible piston rod having rod segments hinged together and outwardly threaded, wherein at least a portion of the flexible piston rod extends longitudinally in a curved configuration inside the housing.
11. The wearable medicine dispensing device of claim 1 , wherein the drive mechanism prevents over-dispensation of the medicine in the event of continuous rotation of the reversible motor in any of the first rotational direction and the second reverse rotational direction.
12. The wearable medicine dispensing device of claim 11 , wherein the drive mechanism prevents over-dispensation of the medicine in the event of continuous rotation of the reversible motor so as to provide a fail-safe protection against over-dosage of medicine.
13. The wearable medicine dispensing device of claim 1 , wherein the drive mechanism further comprises a linearly displaceable plate coupled to the reversible motor.
14. The wearable medicine dispenser device of claim 13 , wherein one or more full rotations of the reversible motor causes the linearly displaceable plate to act upon a pawl of the drive mechanism.
15. The wearable medicine dispensing device of claim 1 , further comprising a battery in electrical connection with the reversible motor so as to provide power to rotate the reversible motor in a first direction and in a second reverse direction, the battery being positioned inside the portable housing.