Questions tagged [medical]
For applications in the medical arena that will come in contact with a patient. In general these applications need to satisfy international standards such as IEC60601. These applications have stringent patient isolation constraints, capacitive leakage constraints, mode of failure constraints, and voltage or current limits that can impose considerable design limitations.
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How is a mains-connected medical device made safe against electrocuting me?
I am in physical therapy now. Some of the devices are connected to wall power, and used for muscle electrostimulation. The patient information states that no single malfunction can connect me to 230V, ...
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Is it practical for firmware to be uniquely identified in production
Are there systems available in large scale manufacturing that allow a unique serial number to be programmed into the firmware or some free memory space for each PCB that comes through?
I've found ...
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Medical electronic devices quality
Is there a special grade for electronic components made to be used in medical devices such as life support systems?
I have read in most data sheets that "this product is not to be used in life support ...
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Are rechargeable li-ion considered primary batteries if charging is not available on the device?
We are designing a one time use medical device which we would like to power using a li-ion pack that would be charged only once at the time of manufacture.
For the purposes of compliance (IEC 60601) ...
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Circuit for small level voltage detection (microvolts)
I have been working on a project lately which help in the detection myogenic potentials (of the levels of micro-volts).
After studying from several places, I finalized the following test circuit.
The ...
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Designing single fault safety into class I device
I'm trying to wrap my head around safety standards for electrical equipment. My device is medical, so for me section 8 of IEC60601-1 is what really matters to me, but it's kind of my understanding ...
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What type of ultrasonic transducers are used in medical ultrasound devices?
When I search on DigiKey for ultrasonic transducers, all I get back is the circular transducers that are sold for the various DIY projects. i.e. the picture below:
However, the "medical" ultrasound ...
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Using optocouplers at the end of a twisted pair
I am designing a dumb "isolation box" that is to sit between a computer and medical data acquisition equipment. The purpose of this box is to inject power and to provide communications and digital ...
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How do medical SMPS achieve lower Earth leakage compared to "regular" AC-DC SMPS?
When using a "regular" (i.e. not medical grade) AC-DC isolated SMPS in the following fashion, a strong mains common-mode voltage is created on the DC side due to - I believe - the stray ...
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Circuit Testing, Verification & Certification Standards for Biomedical Devices
Please note: I would have posted this question on HealthIT.SE but they are apparently now closed for business, and I believe this site is the next most appropriate place to ask this. I believe this ...
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Difference between a normal tactile switch/pushbutton and a detection switch/pushbutton
What is the general difference between a normal tactile switch/push button and a detection switch/push button?
I have heard that if in an application, for example, a pushbutton has to be pressed for a ...
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Help with finding the type of output for a mems mircophone
I am using this MEMS microphone for a stethoscope project. The data sheet recommends the following interface circuit.
I can't seem to find where it states specifically that it is a differential output ...
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Patient Connection Radiated Emissions problem
The company I am working for is developing a patient-connected device intended to deliver Functional Electrical Stimulation to a connected user. We are currently struggling to pass the radiated ...
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Make an electronic Stethoscope
I've seen some kind of electronic stethoscope that can capture heart beat rate and filter it with so many other features.
Main oscope of my questoin is about capturing heart sound. There is many ways ...
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Difficulty in gaining Class II CE certification for an aluminium single-sided PCB
We have a product that consists of an aluminium single-sided PCB with micro-controller and LEDs soldered to the copper side. The PCBA is shaped so that it can be bent to fit over the scalp of the user ...
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