15/12/2025
We talk a lot about adherence — but not enough about the real-world obstacles that can quietly disrupt it.
One of the most overlooked is device confusion: the gap between what patients expect a device to do and what the new design actually requires.
When patients switch from one auto-injector to another, many don’t start completely fresh.
They often carry the “muscle memory” of the previous device — how they held it, where they looked for the button, what feedback they trusted — and those habits don’t always fit the new design.
They may bring behaviors of usage:
• Where they expect the button to be
• How they expect to hold the device
• The order of actions they believe is “right”
• What kind of feedback tells them, “You did it correctly”
If the new device doesn’t match those expectations, negative transfer kicks in:
old habits clash with the new design.
This can lead to:
• Misfires or incomplete injections
• Extra time reading IFUs for every dose
• Stress and self-doubt — “I’m not sure I did it right”
• Over time, missed doses and lower adherence
For chronic therapies, this is not a small usability issue — it’s a clinical and commercial risk.
At E3D, we built the eMU-P™ Reusable Electrical Auto Injector around key beliefs — and one of them is simple:
If patients can trust the device, they are far more likely to stay on therapy.
Beyond its technical qualities, eMU-P™ helps patients to:
• Minimize negative transfer — reducing errors when switching from another device
• Follow clear, step-by-step guidance — with fewer “Am I doing this right?” moments, especially for anxious, older, or first-time users
• Gain confidence through feedback — clear visual and/or audible confirmation supports long-term adherence and reduces cognitive load
And more — all designed to make the experience safer, more intuitive, and easier to master.
A device patients can quickly master — and continue using correctly — becomes an ally, not a barrier, to treatment.
If you’re developing drug–device combinations and are concerned about switching, persistence, and real-world adherence, this is where device design truly matters.
We’d be happy to show how eMU-P™ can bring more value to your therapy by turning a potential adherence risk into a design advantage.
Connect with us:
📩 E3D@elcam3d.com — let’s set up a meeting.
