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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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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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 100mm x 1mm capillary tubes using the Raspberry Pi GPIO pin PWM feature and a piezoelectric actuator.
The pulses ...
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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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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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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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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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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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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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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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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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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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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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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 ...
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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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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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