Drug delivery device

EP4770702A1Pending Publication Date: 2026-07-08SENSILE MEDICAL AG
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Patent Information

Application Number
EP2024761620
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-08-31
Filing Date
2024-08-26
Publication Date
2026-07-08

AI Technical Summary

Technical Problem

Existing drug delivery devices for subcutaneous administration are complex, bulky, and costly due to the need for motor drives that operate over a wide range of speeds, and they face challenges in accurately measuring the axial displacement of the pump rotor, which can lead to inaccuracies in drug delivery.

Method used

A drug delivery device with a disposable unit that includes a pumping system with a pump engine having a stator and a rotatably and axially movable pump rotor, coupled with a drive unit containing an electronic control system, a motor, and a rotor position sensing system. The system adjusts flow rates by switching the motor on and off, ensuring accurate axial displacement measurement and occlusion detection.

Benefits of technology

The device is safe, reliable, compact, and economical, ensuring accurate and controlled drug delivery with reduced complexity and cost, while providing robust safety mechanisms for occlusion detection and malfunction prevention.

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Abstract

A drug delivery device comprising comprising a delivery unit (3) and a drive unit (4), the delivery unit comprising a drug container (5) and a pumping system (8) having a pump engine (38) with a stator (29) and a pump rotor (31) configured to effect an axial piston stroke as a function of the rotation about an axis of rotation of the pump rotor relative to the stator for pumping liquid out of the drug container, the drive unit comprising a housing (2), an electronic control system (6), a pump drive (7) including a motor (16), a motor output transmission shaft (17) driven in rotation by the motor (16), a rotor position sensing system (9), and a coupling (21) slidably coupled to the motor output transmission shaft (17) driven in rotation by the motor output transmission shaft, the coupling (21) having a pump side interface (39) engaged with a drive coupling interface (40) of the pump rotor (31) configured for transmitting torque from the motor (16) to the pump rotor (31) and for effecting an axial displacement following an axial displacement of the pump rotor (31), the electronic control system (6) comprising a motor drive circuit having a delivery control module, the delivery control module receiving an axial position measurement of the pump rotor (31) as a function of the rotational position of the pump rotor. The delivery control module is configured to emit an alarm condition defining an occlusion event of the drug delivery device triggered after an axial position of the rotor is measured as a value above an occlusion position threshold, or after an axial displacement amplitude of the rotor is measured below an occlusion displacement threshold, for at least two revolutions of the pump rotor (31) within a window in a range of at least three to no more than ten revolutions.
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