BACKGROUND

Many wearable drug delivery devices include a reservoir for storing a liquid drug. A drive mechanism is operated to expel the stored liquid drug from the reservoir for delivery to a user. Often, the user is required to transfer the liquid drug from a vial or other container to the reservoir before it may be dispensed to the user.

Many conventional drive mechanisms, however, use a plunger to expel the liquid drug from the reservoir. Accordingly, the drive mechanism generally has a length equal to a length of the reservoir. When paired with a standardized pre-filled cartridge, these wearable drive mechanisms cause a length of the drug delivery devices to be significantly larger—for example, about twice the length of the cartridge. Increasing the size of the drug delivery devices to accommodate pre-filled cartridges and corresponding drive mechanisms leads to bulky devices that are uncomfortable for the user to wear.

It would be advantageous for drug delivery devices to include standardized pre-filled containers (e.g., 3 mL International Organization for Standardization cartridges) for storing and dispending the liquid drug, to obviate the need for the user to transfer the drug to the drug delivery device while also streamlining order fulfillment by supplying pre-filled drug delivery devices to the user. Accordingly, there is a need for a drive system for expelling a liquid drug from a reservoir, including a standardized, pre-filled cartridge, that reduces a size of a drug delivery device, allowing the size and form factor of the drug delivery device to remain compact and user-friendly.

SUMMARY

Disclosed is an example of a linear volume shuttle fluid pump. The example of the linear volume shuttle fluid pump includes a first grip component, a first plunger component, a second grip component, a second plunger component, and a pump chamber component. The first plunger component is coupled to the first grip component and the second plunger component is coupled to the second grip component. A portion of the first plunger component may be positioned in a fluid line of the pump chamber component and a portion of the second plunger component may be positioned in the fluid line of the pump chamber component. The pump chamber component may be positioned between the first and second grip components and may include an inlet pathway and an outlet pathway coupled to the fluid line, and the inlet pathway may be coupled to a reservoir storing a liquid drug, and the outlet pathway may be coupled to deliver the liquid drug.

Another example of a linear volume shuttle pump that includes a first closed-end needle, a second closed-end needle and a pump chamber is provided. The first closed-end needle has a first side port and the second closed-end needle having a second side port. The pump chamber component having a first end of the first closed-end needle and a first end of the second closed-end needle positioned within the pump chamber component, a second end of the first closed-end needle coupled to an outlet port coupled to deliver a liquid drug, and a second end of the second closed-end needle coupled to an inlet port coupled to a reservoir storing the liquid drug, wherein the pump chamber component includes a first seal, a second seal, a third seal, and a fourth seal.

A further example of a linear volume shuttle fluid pump is provided. The linear volume shuttle fluid pump includes a guide component, a pump chamber component, a piston positioned within the pump chamber component, wherein the pump chamber component is positioned around the piston. The piston nut is coupled to the piston, a piston crimp is coupled to the piston nut with a wire crimp coupled to the piston crimp. A shape memory alloy (SMA) wire is coupled to the wire crimp.

