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US 12,758,702 B2Granted
Infusion pumps and methods with shape memory wire driven syringe mechanism
AssigneeTandem Diabetes Care, Inc.
InventorsEduardo Ho, Reza Farshchi, William T. Trevaskis
Life of this patent
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Abstract
Disclosed herein are apparatuses and methods for an ambulatory infusion pump actuated with a shape memory alloy (SMA) wire. An SMA wire operated mechanism can include an actuator lever to increase the SMA wire's strain into a usable displacement to move a pawl that ratchets to a ratchet wheel to rotate a lead screw to advance a plunger a precise amount within a reservoir to deliver a precise amount of fluid.
Claims20
An ambulatory infusion pump, comprising:
- a reservoir configured to contain a medicament;
- a syringe assembly including a plunger configured to dispense medicament from the reservoir;
- a ratchet wheel configured to rotate the syringe assembly, the ratchet wheel comprising a plurality of teeth extending around an outer circumferential surface of the ratchet wheel;
- a pawl configured to engage with the plurality of teeth of the ratchet wheel, wherein the pawl includes an elongate aperture configured to fit around a portion of the plurality of teeth of the ratchet wheel;
- an actuator lever mechanically linked to the pawl;
- and
- a shape memory wire mechanically linked with the actuator lever, wherein actuation of the shape memory wire shortens the shape memory wire to cause the shape memory wire to move the actuator lever such that the actuator lever moves the pawl to rotate the ratchet wheel and syringe assembly to cause the plunger to dispense a predetermined amount of medicament from the reservoir.
4 more elements
An ambulatory infusion pump, comprising:
- a reservoir configured to contain a medicament;
- a syringe assembly including a plunger configured to dispense medicament from the reservoir;
- a ratchet wheel and pawl linked to the syringe assembly, the pawl comprising an elongate lever configured to interface with an outer circumferential surface of the ratchet wheel;
- and
- a shape memory wire mechanically linked with the ratchet wheel and pawl, wherein actuation of the shape memory wire shortens the shape memory wire to cause the shape memory wire to move the pawl to rotate the ratchet wheel and syringe assembly to cause the plunger to dispense a predetermined amount of medicament from the reservoir,
- wherein the syringe assembly comprises a drive tube having internal threads interfaced with a lead screw attached to the plunger and wherein the ratchet wheel is disposed around the drive tube such that rotation of the ratchet wheel causes rotation of the drive tube and lead screw to advance the plunger.
3 more elements
An ambulatory infusion pump, comprising:
- a reservoir configured to contain a medicament;
- a syringe assembly including a plunger configured to dispense medicament from the reservoir;
- a ratchet wheel and pawl mechanically linked to the syringe assembly, the pawl comprising an elongate lever configured to interface with an outer circumferential surface of the ratchet wheel;
- and
- a shape memory wire mechanically linked with the ratchet wheel and pawl, wherein actuation of the shape memory wire shortens the shape memory wire to cause the shape memory wire to move the pawl to rotate the ratchet wheel and syringe assembly to cause the plunger to dispense a predetermined amount of medicament from the reservoir,
- wherein the pawl pushes the ratchet wheel when the shape memory wire is actuated.
3 more elements
Dependencies are inferred from the claim text.