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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Is there a standard equivalent to automotive standard AEC-Q200 for the medical sector?
I want to ensure components of high integrity characteristics are utilised in a design by a third party.
In the automotive sector AEC-Q200 can be stipulated, e.g. (https://www.digikey.com/en/product-...
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1answer
59 views
What is a good SNR for a medical device like a pulse oximeter?
What is a good SNR for a medical device like a pulse oximeter?
Is there a U.S. Federal standard for this?
Thanks!
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1answer
66 views
Voltage / amperage / setup for tingling sensation
There are small pens (powered by a single or double 1.5V battery) or other medical devices that upon touching your skin produce a tingling sensation.
Main question: I wonder to what voltage, amperage ...
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2answers
567 views
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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2answers
139 views
Pressure sensor without using MEMS chips [closed]
I'd like to figure out how to make a pressure sensor for very low cost (essentially disposable), mass produced piece of medical equipment.
The problem: this can't use any parts which aren't already ...
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1answer
117 views
Developing a Medical Product Using AliExpress Modules
We are developing a medical product and we are using some modules that we got from AliExpress (www.aliexpress.com).
They are really cheap and gave us the same results with the modules which we made ...
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1answer
117 views
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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1answer
230 views
SMPS electrical noise issue
1I'm using class 2 medical graded SMPS in our device. So earth connection not recommended. When connecting SMPS to load (contains capacitive touch LCD),
touch function is affected by SMPS noise. When ...
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5answers
2k views
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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1answer
128 views
Circuit for high voltage pulses using raspberry pi PWM to drive a piezoelectric actuator
I am trying to engineer a device to separate red blood cells from blood plasma in 100mmx1mm capillary tubes using the raspberry pi GPIO pin PWM feature and a piezoelectric actuator. The pulses ...
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2answers
210 views
ECG electric design: 1 and 3 op-amp designs from a safety point of view
During the design of an ECG using an instrumentation and a differential amplifier, we can across this question:
Comparing the one and three op-amp designs from a safety point of view: of the two ...
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2answers
746 views
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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2answers
287 views
Double ethernet magnetics for a passive medical application
I am designing medical data acquisition equipment that requires moderately fast data transfer. As part of the design we are using a custom 100BASE-T PoE architecture (and cabling) to the data ...
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2answers
158 views
Recording of sensory nerve evoked potential generated through skin-receptors [closed]
If we touch / give pressure to a skin, there are many mechano-receptors like meissner/pacinian corpuscles that produce action potential in neurons.
I am in a need to detect those action potentials ...
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0answers
63 views
Medium Power Charge Pumps
I'm working on an MRI research project where I need to power my device with a single BNC cable. Internally my device needs 15V, -8.5V, 5V, 3.3V and 1.2V supplies. The 15V, -8.5V and 1.2V only need ...
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2answers
141 views
How to measure body temprature and HBR with just one IR transmitter and receiver
I want to measure body temperature and heartbeat rate only with a IR receiver and transmitter. How could I do that? Is it an accurate method? Or I have to use IR temperature sensor for this.
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1answer
256 views
Power supplies with medical safety approval
Regarding the data sheet of this SMPS power supply. In the first page it says:
2 x MOPP Medical safety according to AAMI/ANSI ES 60601-1:2005(R) and
IEC/EN 60601-1 3rd edition
Then I googled to ...
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1answer
567 views
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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10answers
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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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1answer
221 views
Ambient Light cancellation on Pulse Oximeter
I'm trying to build a pulse oximeter using TSL2305 LTF sensor and 2 LEDs(Red and IR).
The desired graph expected from the light are plotted correct but I want to know whether there should be any ...
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1answer
359 views
Defibrillator energy?
Just been reading this where this statement is made:
If the patient is in Ventricular tachycardia (VT) or ventricular
fibrillation (VF) on the monitor, immediately apply the pads and shock
the ...
3
votes
1answer
178 views
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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1answer
92 views
Why do I need to keep Led drive and photodiode ADC supplies and traces separate in a pulse oximeter design
I've seen a couple of application notes recommend keeping led drive supply and ADC supplies separate.
To me it seems that since the LED will illuminate the photodiode that ADC is reading anyway, ...
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2answers
130 views
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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2answers
2k views
How is this EEG circuit amplifying and filtering input correctly?
Several weeks ago I posted several|questions about a DIY EEG reader that I found on Instructables. To my surprise, it appears to actually be a fairly well-designed circuit.
The main stages of this ...
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1answer
219 views
How do I choose a cable /cord, connected to mains part, that is compliant with IEC 60601-1 3rd ed.?
IEC 60601-1 is a standard for medical devices. It describes which are the requirements for the Means of Operator Protection and Means of Patient Protection, the current leakages and so on. I don't ...
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2answers
252 views
To what extent does an ADC solve noise along an analog circuit?
Please note: Although this question involves EEG, I don't expect anyone here to be knowledgeable in this area! This is a simple electronics question!
I'm trying to understand the circuitry devised in ...
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3answers
198 views
Surface-Mount Prototyping (AXL 335 & SFH 7050)
I'm working on a senior project and I'm having some trouble prototyping with surface mount components. I know you can find SMT adapters out there for most SMT chips and components, but I've been ...
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1answer
807 views
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 ...
