Deflectable Transducers for Accurate Dose Detection in Drug Injection Devices

The patent applies the disposable principle by designing the entire injection device including electronic components (transducers, processor, memory) as a single-use unit. The electronic components are integrated into a disposable cartridge that is discarded after one use, eliminating the need for expensive reusable electronic components. This resolves the contradiction by making the device economically viable for single-use applications while maintaining accurate dose detection capabilities through integrated electronics.

The patent changes the operational parameters of the transducers by using deflectable elements that respond to mechanical movement during injection. The transducers are configured to detect specific movement patterns (deflection distances, time delays between activations) that correspond to legitimate dose administration. This parameter-based detection approach enables accurate dose measurement while using simple, cost-effective transducer designs suitable for disposable devices.

The patent applies preliminary action by configuring the transducer system to expect and recognize specific sequences of activations corresponding to legitimate injection operations. The processor is programmed with predetermined patterns (e.g., specific time delays between transducer activations, specific sequences of protrusion engagements) that must be matched before registering a dose. This preliminary programming enables the system to distinguish between intentional user actions and accidental activations during handling or transportation.

The patent implements feedback through the processor's analysis of transducer activation patterns. The system continuously monitors the sequence, timing, and pattern of transducer responses, comparing them against predetermined criteria for legitimate injection operations. When the activation pattern matches the expected sequence (e.g., correct time delay between first and second transducer activations), the system registers the dose; when it doesn't match (e.g., simultaneous activation indicating a drop), the system rejects it as erroneous. This feedback mechanism maintains ease of operation while eliminating false activations.

The patent applies segmentation by dividing the detection function into multiple independent deflectable transducers positioned at different locations along the injection path. Each transducer responds to specific mechanical events (e.g., piston movement, needle advancement) at different stages of the injection process. This segmentation enables the system to detect the sequence of operations and verify that they occur in the correct order with appropriate time delays, significantly improving reliability while keeping each individual transducer simple in design.

The patent utilizes periodic action by designing the transducer system to detect repetitive mechanical events that occur during normal injection operation. The deflectable transducers are positioned to respond to periodic movements of injection components (piston reciprocation, needle advancement increments) that follow a predictable pattern. The processor analyzes these periodic signals to confirm legitimate operation, distinguishing them from random activations caused by accidental drops or handling errors. This periodic detection approach improves reliability without requiring complex transducer designs.