Pen-Type Injection Device Brake Assembly for Dose Correction
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Solution Overview
Problem
Conventional pen-type injection devices often fail to satisfactorily combine features for dose correction and last dose control, requiring cumbersome additional steps and lacking intuitive user interfaces for dose setting and feedback mechanisms.
Innovation Solution
The introduction of a brake assembly with a ratchet member and driver components that allow for dose setting and correction without rotating the dose set knob, while enabling rotation during injection, along with a dose stop member for last dose management and audible/tactile feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional devices provide dose correction capability, then users can correct oversized doses, but the devices require additional cumbersome steps and lack intuitive operation
Solution Approach 1:
The brake assembly is integrated with the dose setting mechanism, combining the braking function and dose correction function into a single unified system. The ratchet member on the driver works directly with the brake member, eliminating the need for separate correction mechanisms and reducing operational steps.
Solution Approach 2:
The ratchet mechanism provides automatic one-way engagement that enables intuitive dose correction without requiring complex user actions. The brake member and ratchet member automatically engage and disengage based on rotation direction, allowing users to correct doses through simple reverse rotation of the dose set knob.
2Reliability
If conventional devices provide last dose control, then users cannot set doses greater than remaining medication, but the devices require additional steps and mechanisms
Solution Approach 1:
The brake assembly serves multiple functions: it prevents driver rotation during dose setting, enables driver rotation during injection, and works with the dose stop member to provide last dose control. This multi-functional design eliminates the need for separate control mechanisms.
Solution Approach 2:
The dose stop member acts as an intermediary between the user and the dose setting mechanism. It physically blocks the dose set knob rotation when the maximum dose is reached, providing intuitive feedback without requiring complex electronic or mechanical control systems.
3Ease of operation
If conventional devices use brake assemblies, then driver rotation is controlled, but the engagement mechanisms increase device complexity
Solution Approach 1:
The brake assembly is divided into distinct functional components: the brake member with brake teeth, the ratchet member with ratchet teeth, and the spring member. Each component has a specific function, and their simple geometric shapes and straightforward engagement mechanisms reduce manufacturing complexity while maintaining effective rotation control.
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
Enables seamless dose setting, correction, and injection with improved user intuitiveness and accuracy, ensuring that the dose does not exceed the remaining medication amount, and providing clear feedback.
Implementation Method 1
A brake assembly is disposed in the housing has a ratchet member. A driver includes at least one external tooth engaging the ratchet member. The engagement between the ratchet member and the at least one external tooth substantially prevents the driver from rotating with respect to the dose set knob during dose setting and dose correcting.
Data Source
AI summary
The disclosure provides driver components, systems and drive methods that facilitate improved dose setting, correcting, and/or dispensing in a multiple use pen-type injection device. In particular, various novel braking systems are disclosed that can be implemented within the pen-type injection devices to help achieve the improved dose setting, correcting, and/or dispensing.