Smart Sensors for Efficient Drug Delivery Devices

This patent describes how drug delivery devices, like wearable pumps, can save battery power by using sensors to precisely control when their internal motor pushes medicine.

What it covers

This patent describes techniques for managing the force applied by a motor, called a 'drive mechanism', in a drug delivery device. Based on the abstract, the system uses one or more driving arms to push a 'ratchet wheel'. 'Sensor contacts' are positioned to detect when a driving arm has completed its action on the ratchet wheel. This allows the device to stop the motor precisely, preventing it from running longer than needed and saving electrical power. For example, in a wearable insulin pump, this technique could extend battery life by ensuring the motor only activates exactly when required to dispense a dose, rather than running for an arbitrary, potentially longer, duration.

What it doesn't cover

• —Does not cover drug delivery devices that use a continuous motor without a ratcheting mechanism.
• —Does not cover devices where force application is determined by measuring drug flow directly, rather than sensing the drive mechanism's position.
• —Does not cover drug delivery where the power saving is achieved through chemical means or passive diffusion, rather than controlling an electrical drive mechanism.
• —Does not cover drug delivery devices that rely on manual activation or purely pneumatic/hydraulic systems without an electrical drive.
• —Does not cover drive mechanisms that do not employ distinct driving arms and ratchet wheels, as described in the abstract.

The clever bit

The clever part is using specific sensor contacts to detect the exact moment a driving arm completes its action on a ratchet wheel. This precise timing allows the device to stop the motor immediately, preventing wasted energy and significantly saving electrical power.

Why it matters

Efficient power use is critical for wearable medical devices that need to operate for long periods without frequent recharging or battery changes. This technology could make devices like insulin pumps or auto-injectors more convenient and reliable for patients by extending their operational life. Better battery life also improves patient adherence and reduces the burden of device management, especially for devices affixed to the skin.

Real-world examples

• 1.Wearable insulin pumps
• 2.On-body drug delivery patches
• 3.Automated injection pens
• 4.Infusion pumps for chronic conditions