Wearable Infusion Pump Assembly With Optical Volume Sensing

The pump device is divided into separate modular components including a reusable pump unit and disposable infusion sets. This segmentation allows the complex electronic and mechanical components to be concentrated in the reusable unit while the disposable units contain only the essential fluid delivery components, reducing overall device complexity and making the system more manageable despite the compact form factor.

The disposable infusion set is designed to be inserted into and integrated with the reusable pump unit, creating a nested configuration. The infusion set contains the fluid pathway and delivery components that nest within the pump housing, allowing the compact design to accommodate multiple functional elements without increasing external dimensions or overall complexity.

The system performs preliminary integrity verification tests during the startup sequence before beginning fluid delivery. The control assembly automatically tests the fluid pathway, sensors, and actuators to ensure proper function, and only initiates delivery when all components are verified to be working correctly. This preliminary action ensures reliability without requiring permanent complex verification systems throughout operation.

The pump assembly incorporates self-diagnostic capabilities where the control assembly automatically monitors the status of all components including the shape memory actuator, optical sensors, and fluid pathways. The system performs self-verification and can detect malfunctions without external intervention, maintaining high reliability through automated self-monitoring rather than requiring additional complex external verification systems.

The pump assembly utilizes a shape memory actuator that can dynamically change its configuration between a compressed state for compact wearability and an expanded state for efficient fluid delivery. The actuator transforms from a compact form factor when not in use to an extended configuration during operation, allowing the device to maintain small size when worn while providing sufficient reservoir volume and delivery capacity when activated.

The system changes the physical state and configuration parameters of the reservoir and actuator components. The reservoir can be collapsed or compressed to reduce volume when not in use, and the shape memory actuator changes its dimensional parameters between stored and active states. These parameter changes allow the device to be compact during wear while maintaining adequate capacity for drug delivery when needed.