Drug cartridge with drive system
Drive systems for a drug delivery device are provided. The drive systems can be positioned within a container that stores a liquid drug to be delivered to a user. The drive systems can be coupled to a plunger positioned within the container. The drive systems can be incrementally advanced to drive the plunger further into the container, thereby expelling a portion of the stored liquid drug from the container for delivery to the user. The container can be any type of container including a pre-filled, standardized drug cartridge. The drive systems and container can be components of a wearable drug delivery device.
1. A resetting lead screw drive, comprising:
a first brake component;
a second brake component;
a plunger coupling component;
a lead screw positioned through the second brake component and coupled to the first brake component and the plunger coupling component;
a tilt nut coupled to the lead screw; and
a ratchet gear coupled to the tilt nut, wherein:
in a first cycle of operation, the second brake component is configured to be held stationary, rotation of the ratchet gear in a first direction is configured to advance the first brake component, the lead screw, and the plunger coupling component toward a plunger positioned within a drug container to expel a portion of a stored liquid drug for delivery to a user, and
in a second cycle of operation, the first brake component, the lead screw, and the plunger coupling component are configured to remain stationary as the second brake component is advanced toward the plunger.
2. The resetting lead screw drive of claim 1 , further comprising a drive pawl configured to rotate the ratchet gear in the first direction.
3. The resetting lead screw drive of claim 2 , further comprising two or more shape memory wires coupled to the drive pawl.
4. The resetting lead screw drive of claim 3 , wherein the two or more shape memory wires are configured to move the drive pawl when alternatively activated, thereby rotating the ratchet gear in the first direction.
5. The resetting lead screw drive of claim 4 , wherein the tilt nut is configured to rotate in the first direction when the ratchet gear is rotated in the first direction.
6. The resetting lead screw drive of claim 5 , further comprising a spring positioned between the first brake component and the second brake component.
7. The resetting lead screw drive of claim 6 , wherein the spring is configured to compress as the first brake component advances toward the second brake component.
8. The resetting lead screw drive of claim 7 , wherein the tilt nut comprises a first tilt nut component coupled to the ratchet gear by a first hinge and a second tilt nut component coupled to the ratchet gear by a second hinge.
9. The resetting lead screw drive of claim 8 , further comprising a top hat component covering the first and second tilt nut components, respectively.
10. The resetting lead screw drive of claim 9 , wherein the top hat component is configured to maintain the first tilt nut component engaged with the lead screw and the second tilt nut component engaged with the lead screw.
11. The resetting lead screw drive of claim 10 , wherein the first brake component comprises a first ramp component and a second ramp component.
12. The resetting lead screw drive of claim 11 , the first ramp component configured to engage a first snap component coupled to the top hat component and the second ramp component configured to engage a second snap component coupled to the top hat component when the first brake component is adjacent to the second brake component.
13. The resetting lead screw drive of claim 12 , wherein the top hat component is configured to release the first tilt nut component when the first snap component is engaged by the first ramp component and the top hat component is configured to release the second tilt nut component when the second snap component is engaged by the second ramp component.
14. The resetting lead screw drive of claim 13 , wherein the first tilt nut component is configured to rotate about the first hinge when released and the second tilt nut component is configured to rotate about the second hinge when released, thereby disengaging the first and second tilt nut components from the lead screw.
15. The resetting lead screw drive of claim 14 , wherein the spring is configured to expand when the first and second tilt nut components disengage from the lead screw.
16. The resetting lead screw drive of claim 15 , wherein the spring is configured to provide a force to advance the second brake component toward the plunger when the first and second tilt nut components disengage from the lead screw.
17. The resetting lead screw drive of claim 9 , wherein the plunger coupling component is configured to engage the top hat component when the second brake component is adjacent to the plunger coupling component.
18. The resetting lead screw drive of claim 17 , wherein the top hat component is configured to re-cover the first and second tilt nut components, respectively, when engaged by the plunger coupling component.
19. The resetting lead screw drive of claim 18 , wherein the first and second tilt nut components re-engage the lead screw when re-covered by the top hat component, respectively.
20. The resetting lead screw of claim 1 , wherein the first and second brake components are self-energizing brakes.
21. The resetting lead screw of claim 1 , wherein the drug container is an International Organization for Standardization (ISO) drug cartridge.
22. The resetting lead screw of claim 21 , wherein the liquid drug is insulin.
23. A resetting lead screw drive, comprising:
a first brake component including a first ramp component and a second ramp component;
a second brake component;
a plunger coupling component;
a lead screw positioned through the second brake component and coupled to the first brake component and the plunger coupling component;
a tilt nut coupled to the lead screw;
a top hat component covering the tilt nut; and
a ratchet gear coupled to the tilt nut, wherein:
rotation of the ratchet gear in a first direction is configured to advance the first brake component, the lead screw, and the plunger coupling component toward a plunger positioned within a drug container to expel a portion of a stored liquid drug for delivery to a user, and
the first ramp component is configured to engage a first snap component coupled to the top hat component and the second ramp component configured to engage a second snap component coupled to the top hat component when the first brake component is adjacent to the second brake component.
24. A resetting lead screw drive, comprising:
a first brake component;
a second brake component;
a plunger coupling component;
a lead screw positioned through the second brake component and coupled to the first brake component and the plunger coupling component;
a first tilt nut component and a second tilt nut component coupled to the lead screw; and
a ratchet gear coupled to the first tilt nut component and the second tilt nut component, wherein:
rotation of the ratchet gear in a first direction is configured to advance the first brake component, the lead screw, and the plunger coupling component toward a plunger positioned within a drug container to expel a portion of a stored liquid drug for delivery to a user, and
the first tilt nut component is coupled to the ratchet gear by a first hinge and the second tilt nut component coupled to the ratchet gear by a second hinge.