Modular Inhaler Adherence Monitor With Dual-Event Sensing

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Solution Overview

Problem

Existing inhalers lack effective methods to monitor user adherence, as integrated monitors are expensive and impractical for disposable inhalers, and attachable monitors face design challenges due to the unique shape and flexibility of inhalers like Symbicort Rapihaler®, making it difficult to attach sensors without interfering with operation.

Innovation Solution

A modular adherence monitor that attaches to inhalers like Symbicort Rapihaler® using a housing that secures via a reverse mold design, incorporating sensors to detect actuation and inhalation events, and communicates data via Bluetooth Low Energy to a client device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an adherence monitor is integrated into the inhaler itself, then monitoring functionality is built-in, but the cost increases and it becomes impractical for disposable inhalers

Engineering Contradiction:

Improveadherence monitoring functionalityVSAvoidcost and practicality

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The system is divided into two independent parts: a reusable adherence monitor unit and a disposable inhaler. The monitor contains all electronic components (sensors, controller, memory, transceiver) while the inhaler remains a simple medical device. This segmentation allows the expensive monitoring functionality to be reused across multiple inhalers, reducing per-unit cost while maintaining reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The adherence monitor is designed as a universal device that can attach to and monitor multiple different inhaler models. The monitor unit serves multiple functions: detecting actuation events, measuring inhalation flow, storing data, and transmitting information. This multi-functionality in a single reusable unit eliminates the need to integrate expensive electronics into each disposable inhaler.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of manufacture

If an attachable monitor is used on existing inhalers, then cost is reduced, but design challenges arise due to the unique shape and flexibility of inhalers

Engineering Contradiction:

ImprovecostVSAvoidattachment design

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The monitor housing incorporates a flexible skirt made of elastomeric material that can conform to the curved surfaces of different inhaler models. This flexible shell allows the rigid electronic components to be mounted on a structure that adapts to various inhaler shapes without requiring custom-designed attachments for each model, simplifying the overall design while reducing cost.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The attachment mechanism includes flexible and movable components that can adapt to different inhaler geometries. The flexible skirt and mounting structure allow the monitor to be attached to various inhaler models without rigid, model-specific fixtures, reducing design complexity while maintaining secure attachment.

Inventive Principle:

Principle #15Dynamics

3Loss of information

If sensors are attached to the inhaler, then adherence data can be collected, but the attachment may interfere with the inhaler operation

Engineering Contradiction:

Improveadherence data collectionVSAvoidinhaler operation

Core Design Contradiction:

Loss of informationVSEase of operation

Solution Approach 1:

The electronic components and sensors are extracted from the inhaler and placed in a separate, attachable monitor unit. This extraction allows the inhaler to operate without any embedded electronics that could interfere with its mechanical function. The monitor attaches externally and detects actuation through non-intrusive means such as optical sensors or motion detection, preserving the inhaler's ease of operation while enabling comprehensive data collection.

Inventive Principle:

Principle #2Taking out (Extraction)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The modular monitor effectively tracks inhaler use and adherence by detecting actuation and inhalation events, providing data analysis without interfering with the inhaler's operation, and ensuring compatibility with various inhaler models.

Implementation Method 1

an actuation detection sensor operable to sense the physical movement of the drug canister when actuated

Methodology Applied

Scientific EffectPhysical movement detection:

Implementation Method 2

an inhalation data sensor operable to sense air pressure change created by inhalation of the dose from the actuation

Methodology Applied

Scientific EffectAir pressure change detection:

Implementation Method 3

The accelerometer outputs a signal indicative of movement of the inhaler prior to actuation

Methodology Applied

Scientific EffectMovement detection: Accelerometer

Data Source

PatentEP4003470B1Modular inhaler adherence monitor

Publication Date: 2025.11.05 RECIPROCAL LABS CORP D B A PROPELLER HEALTH

Figure 1A~1B
Figure 2A~2D
Figure 2E~2H

AI summary

An adherence monitor for attachment to an inhaler is disclosed. The inhaler has a drug canister, an actuator holding the drug canister, the actuator having a mouthpiece, and a dosing device operable to allow the drug canister to be actuated to release a dose. The adherence monitor includes an actuation detection sensor operable to sense the physical movement of the drug canister when actuated. An inhalation data sensor is operable to sense air pressure change created by the inhalation. A controller is coupled to the sensors to record an actuation event.