Questions tagged [biomedical-engineering]
The biomedical-engineering tag has no usage guidance, but it has a tag wiki.
59 questions
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Why does a shorter strut length result in higher outward force in my heart stent simulation?
I've been working on a simulation of a self-expanding heart stent with the same crown number, ring number, crown radius, etc., but with different strut lengths using Abaqus. The stent is expanded to a ...
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How was the length of the damper calculated in this figure?
I was reading this research and tried to calculate the length of the damper but couldn't figure out how. tried using the Law of Cosines but ended up with a different result.
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Gluten level detector [closed]
I was wondering whether it is possible to design gluten level detectors and place them on walls and places.
How, can such a device be designed?
What is the process of designing such a device like?
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How the displacement of the MRD piston is calculated in this Above knee prosthetic?
given that BD is perpendicular on AB,
E is in the middle of BF,
lengths of AB, BD, BF, BE are known,
theta1 and theta2 are the angles of hip and knee respectfully, the ankle is considered fixed.
only ...
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Help identifying a source for medical/bioprocess rotational pinch valve
I am attempting to identify a type of pinch valve that I have seen used in a few different bioprocess and medical blood/fluid perfusion systems. The valve appears to be actuated by a stepper/servo ...
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44
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How does an airflow sensor work?
There are 4 piezoresistive sensors placed at position A, B, C and D.1
I searched for the working principle of an airflow sensor and I saw this. If I am trying to identify the expected displacement ...
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Designing a toilet for autoimmune protection: engineering question
In autoimmune disorders, when a bacteria enters the body, the immune system resounds, growing, fighting it off, but this immune system growth, due, to the autoimmune disorder, also attacks the person'...
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Calculate pressure gradient between 2 compartments so that 4 ml of fluid would flow through a 0.413 mm hole in 72 hours
Introduction.
This question refers to the medical field. Human spinal cord is surrounded by 3 layers: the PIA MATER is in direct contact with the spinal cord itself; the next one is the ARACHNOID ...
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Is it possible / practical to use a directional speaker as a "sound flashlight"?
E.g. use the direction the sound is coming from and the intensity to tell where the object is located at, and the frequency to tell the color of whatever this "flashlight" is pointing at (e....
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31
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Mathematical Modelling of Wireless Power Transfer
I am trying to understand the interaction between a transmitting antenna with a certain transmitting power (denoted PTX in the diagram) and how the radiation pattern of the TX antenna is affected by a ...
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Size characterization
Which technique can I use to characterize the size of my particles? They would be in the range of 50 μm to 300 μm. I have verified using a microscope, but I need a technique to analyse the size ...
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Applications of CO$_2$ sensors [closed]
I am working on a project where I am creating a new type of CO2 sensor. (I can't give details on the functionalities). I am looking for applications to showcase the capabilities and the usefulness of ...
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28
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What Materials and Load cells are suitable for a Medical Weighing device?
I'm creating a medical weighing scale for immobile patients for my final year project in college. The weighing scale is a flat surface that can be slid underneath the patient.
I'm at a standpoint as ...
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Devices powered and charged via electricity generated by human body
I came across articles like:
https://www.sciencedaily.com/releases/2021/02/210210142049.htm
https://pubmed.ncbi.nlm.nih.gov/27836601
and
https://www.dailymail.co.uk/sciencetech/article-2004801/Weve-...
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73
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CFD simulation of an Air and Oxygen gas gradient in a microfluidics device
I am in the process of manufacturing a microfluidic device for use in research, and would like to do a CFD simulation of the interior of the device to see if an oxygen gradient is formed.
The idea is ...
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DIY medical oxygen concentrators [closed]
Given the dreadful surge of COVID cases in India, with people dying for lack of oxygen, I was wondering if the smart folks here could put our heads together to brainstorm a way to develop a how-to ...
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265
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Where do DICOM files store inversion time?
I'm trying to write a T1 Mapping program in Python but I am having a hard time finding the inversion times in the DICOM files I downloaded from visible human project on the NIH website.
When I printed ...
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What material can wick up fluids while not allowing micro-organisms to pass?
I'm looking for a material that can wick up a solution containing nutrients and sugars. The dirty side of the wick should touch a medium to draw up the solution, on the clean side of the wick ...
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54
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Collision of soliton pulses in nerves
Consider the collision of two soliton pulses propagating with identical amplitude, equal velocity
in two opposite directions on a nerve. Assume that the collision is head, reversible and adiabatic. ...
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528
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What is the amount airflow needed from Aquarium Air pump per minute to make a DIY CPAP?
I am trying to make DIY Bubble CPAP that can put a constant pressure on patient.
I am using an Aquarium Oxygen pump as air source.
The motor says 38L/Min in the spec. And by googling I found that an ...
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Classifying motor imagery using EEG data
I am an undergraduate student who is trying to classify motor imagery from EEG data!
I have no experience working with EEG or any neuroscience background, I only have a very basic knowledge of how ...
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I want to test non woven fabrics to see if they are polypropylene, the lining material of N95 masks
A group of us are sewing face masks to prevent the spread of sputum. I've learned that the lining of an N95 mask is made of polypropylene. Polypropylene is also a common interfacing product for ...
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2
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112
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How can the air pressures exiting from a blower be adjusted?
During this covid-19, I was thinking about designing a low cost simple ventilator using a blower. There is a limit of the inspiratory and expiratory pressures, the inspiratory pressure being higher. ...
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Why automakers are/should be making medical ventilators?
I am not very familiar with the mechanics of neither a car nor a medical ventilator. Considering global coronavirus pandemic and shortage of medical ventilators in many countries, I saw some news ...
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Is biological tissue a Dynamical System and a Nonlinear System?
I have biomedical data for analysis and I am using Genetic Algorithm for parameter estimation for the model of the data. As I read about the system identification, I saw terms like dynamical system. I ...
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86
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how can I solve this error in c++: Exception Unhandled? [closed]
I am new in learning C++. I have used this code to show an image, but there is an error that I do not understand!
This is the simple code:
include iostream
include conio.h
include opencv2/core....
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578
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How is the first image estimate generated in CT scan iterative reconstruction (IR)?
Background info:
For decades CT scanners produced medical images from x-rays travelling through the tissues of the patient at different angles through analytical methods based on the Radon transform ...
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58
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Is it possible to power bio-chips with blood sugar?
Suppose I want to implant a bio-chip that consumes a lot of power into my body, for example, a full-fledged CPU, and I don't want to lug around a heavy battery like the ones used in pacemakers, is it ...
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79
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Why aren't artificial gills used together with oxygen tanks for diving?
Artificial gills aren't used for diving, not because they can't extract oxygen out of water, but because they won't provide enough oxygen for someone to breathe (only arround 1% oxygen in water ...
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166
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Pulse Oximetry, does the decimal matter?
I work in a sleep research lab. We have a couple of Masimo pulse oximeters that report pulse oximetry values in terms of integers (e.g. 90, 91, 92, etc.).
Now our principle investigators used to use ...
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733
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Polarity of a relative angle - Knee joint angle
I'm wondering if it's correct to write:
$$ \alpha = \theta_{lg} - \theta_{th} $$
EDIT: the theta angles are defined positive in counter-clock direcction, instead alpha in clockwise direction. My ...
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289
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How to measure and verify ultrasound frequency and intensity from a cheap ultrasonic body contouring device?
Research shows that applying 1 MHz non-focused ultrasound at 3 W/cm2 may reduce subcutaneous fat thickness. In fact, high-end and expensive (costs $5000 >) HIFU ultrasonic transducers are now being ...
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SNR for good MRI imaging
Resolution of MRI can be improved if FOV is reduced keeping other factors constant, but this reduces voxel volume, which in turn reduces SNR. How much SNR is enough for good imaging?
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Searching for Anterior Cruciate Ligament MRI Images for Finite Element Model.
I'm searching for 3D MRI images for generating an mesh to be used in a Finite Element Modeling project. My group has access to a low-resolution CT scan and cadaver knees, but we don't have any good ...
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Measuring gas flow from a low-output device
My lab uses a home-built biomedical instrument that acts as a ventilator for test-subjects. In other words: our device combines nitrogen and oxygen gases and pumps them down the line at a specified ...
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68
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Surgical steel and part production
Steels 316L, 420, 17-4PH and 316LVM are often chosen for medical products and labelled as "surgical grade".
I am curious as to how these types of steel are used for the production of common medical ...
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Positron Emission Tomography: How to get from photon count to radioactivity?
What I have learned
The detectors of the PET actually measure the photons, which are caused by the radioactive tracer injected into the patient. Then, with the help of backprojection, we get the ...
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Metal detectors for medical applications
My group and I are currently working on a biomedical engineering project for our class. Our design idea is a wearable metal detector that uses metallic tracers in the blood to determine the ...
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1
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Designing of a tissue stretching device using a linear actuator
I'm trying to design a device that can stretch a tissue sample of set length, right now about 2 mm, to desired stretch ratios. This will be controlled using a interface where the user can input their ...
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Pump like solenoid but more powerful?
Is there any pump available which can suck the water just like solenoid pump ( which means i can just put the input pipe in water and it will suck the water and get it out unlike DC motor pump which ...
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68
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RULA upper arm angle
I want to perform a RULA based analysis on a set of participants and in order to calculate the RULA score I would need the upper arm(shoulder) angle. My question is would the upper arm angle be based ...
- 111
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How would an electromagnet function within an MRI? [closed]
For the purpose of this situation. Lets say there are 4 small electromagnets within a MRI. All of them activate at the same time. The entire setup is comprised up of non ferrous metals. The metals ...
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181
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Logistic regression in LabVIEW
I am using a psychophysical model to calculate the probability (P) of detecting an electrical stimulus to the skin (amplitude = x) over time (t):
\begin{equation}
P(x;\alpha(t),\beta) = \dfrac{1}{1+e^...
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What kind of materials are plastic syringes made from?
I'm trying to figure out what kind of materials my disposable plastic syringe is made from. I have a Medefil MIS-1130 syringe and when I visited the company website I couldn't find any information on ...
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Does anybody have information on how to refurbish an old laser rod (alexandrite or Nd Yag)? )
With usage, old laser rods eventually will need maintenance by cleaning and refurbishing it. Does anyone know how this is done?
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How does a flexible endoscope turn?
By flexible endoscope I mean colonoscope, gastroscope, etc.
From this video I can see that an endoscope can swivel its tip while in place, kind of like a periscope.
But while moving axially, i.e. "...
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139
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Transducers in cuff-style blood pressure monitors
I have been doing research into blood pressure monitors, and I was wondering when the cuff tightens, how do the transducers actually measure the systolic/diastolic pressure in the arteries.
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3
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592
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Easily accessible material for maximum grip on a prosthetic hand?
Currently in the process of developing a 3d printed prosthetic hand and I am in need of advice on the type of rubber (or other material) we should use at the finger tips to give it more grip. The hand ...
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83
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Measurement of girth of abdomen (automatic) using body impedance measurement [duplicate]
The task I got is to measure the girth of the abdomen continuously for a 24 hour period using a suitable method. I have thought to measure the impedance between two points in the abdomen and use the ...
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Pearson correlation of neural responses with it's linear estimation
I am trying to anderstand the following fact from this article (page 13):
How can single neurons predict behavior
Suppose I have a linear estimation of a stimulus:
$ \hat{s} = \mathbf{w}^T(\mathbf{r} ...
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