DC Bias on capacitanceMulti-layer ceramic chip capacitors (MLCCs) are the most common capacitor found in modern electronics. MLCCs have many attractive features: low ESR, good capacitance-to-volume ratio, relatively low leakage, non-polarity, and low cost. It’s no wonder that when choosing a capacitor, an electrical engineer will usually specify a ceramic first before any other type.
However, there is one major drawback to high-capacitance ceramic capacitors that is poorly understood by even experienced engineers: the effect of DC bias on capacitance.

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medical device designComputer games and medical device design both begin conceptually in a somewhat similar space – a point where reality and science fiction meet. From there the directions they take are infinitely different but the processes are virtually identical. I recently spoke on a panel at our local Global Game Jam (the world’s largest game jam event) about User Experience and Human Factors. I went excited to tell all these budding game developers about UX from a different perspective. I didn’t expect to learn there are so many similarities between the two.

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Image: Bjarne Hansen

Three years ago I migrated from medical device design and development to the client side of Digital Health. I had the privilege of leading and managing components of transformational initiatives related to Electronic Health Record, also known (and preferred by users) as Clinical Information Systems. This experience changed my thinking about medical design excellence.

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Medical Device UX Design process

Image credit: Mariya Tereshkova

A good User Interface (UI) improves usability for any medical device UX Design. Even if your device has all the needed functions and features and your workflow is proven based upon research and testing, the UI that users interact with is where they really gauge the experience of the device. For medical devices, documenting the reasoning behind your design will help it pass through your team and regulatory submissions and approvals.

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Understanding the Basics of Adhesives

Figure 2 Types of Adhesives Image courtesy Pepin Manufacturing

Selecting wearable medical device adhesives requires a solid understanding of the basics of adhesive. Sticking a medical device to skin is not as simple as it sounds. Numerous variables come into play such as the patient’s age, gender, race, diet, activity, skin condition, and climate. Other variables include the stretchability of the skin, contours of the body, perspiration levels and how much hair the patient has at the fixation site.
But wait, there’s even more. Wear time and load requirements will have an affect as well. This is the final installment of a three-part blog series covering the dos and don’ts of developing a skin-worn wearable medical device and the science of sticking to skin.

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wearable medicaldevice

Claris Reflex is a wearable sensor that provides 24/7 continuous monitoring of patient movement.. Photo courtesy Claris Healthcare

There is no denial that the wearable medical device market is growing extremely fast and companies are rushing to get their device to this fast evolving market. Although timing is critical for technology based devices, what is more important is to review and address any high risk issues carefully during each step of development to ensure a successful design. It is much easier to make changes in the beginning rather than make costly fixes later in the development.
Over a three-part blog series I will go over the dos and don’ts when developing a skin-worn wearable medical device and the science of sticking to skin. This first blog explains the dos of skin-worn medical device design and development.

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If you’re reading this, chances are you have a great idea for a medical device and you’re starting your design.   You probably have an electrical element to your design. As tempting as it is to start ordering parts and tinkering, there are a few preliminary documents you can create to help you choose the right parts.  Eventually you’ll need a design that must pass the requirements of IEC 60601-1.

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FDA Regulation of E-cigarettesThe FDA Regulation of E-cigarettes aims to fill a technology regulation gap. Whether it’s the FAA and recreational drones or the USDA and the latest strain of genetically modified corn, widespread use of new technology is often followed by new regulation. And regulators have long struggled to keep pace with the seemingly endless stream of innovation that enters society. It’s not necessarily new technology itself that instigates regulation but rather the refinements that allow it to become widely available to the general public.
The past decade has seen vaporizers and e-cigarettes become widely available and while these products are capable of delivering nicotine in the form of smoke-like vapor, they technically have not met the definition of a “tobacco product” and therefore have been unregulated. Until now that is.

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