Questions tagged [biomedical-engineering]

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What do you think are the difficulties in tissue engineering of complex organs such as the heart and liver, as compared to skin?

What do you think are the difficulties in tissue engineering of complex organs such as the heart and liver, as compared to skin?
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92 views

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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1answer
40 views

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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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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1answer
32 views

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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19 views

How to obtain the radial strength of a stent model in ABAQUS

I am simulating the crimping of a stent in ABAQUS/Standard using a 3D deformable cylinder on which I impose a displacement in order to crimp the stent from an initial diameter of 2.5 mm to a final 1 ...
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1answer
58 views

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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2answers
52 views

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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26 views

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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30 views

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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2answers
28 views

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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2answers
55 views

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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2answers
46 views

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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39 views

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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1answer
43 views

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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1answer
35 views

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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1answer
60 views

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 ...
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41 views

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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84 views

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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65 views

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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1answer
90 views

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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1answer
921 views

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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1answer
77 views

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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3answers
317 views

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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1answer
60 views

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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0answers
24 views

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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3answers
84 views

Why is the jacket or sheath of fibre optic endoscopes always black?

Why is the jacket or sheath of fibre optic endoscopes always black? Is it just a convention, or is there a more logical explanation for this?
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158 views

Finding My, Mz in Complex/Asymmetrical Beam Bending

So I have done a three point loading test on a piece of bone. I have been able to obtain the Second Moments of Area $I_{xx}$, $I_{yy}$, $I_{zz}$. As well as the centroid. I also have the data from ...
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1answer
2k views

Convert Load Deformation (Extension) Data to Stress-Strain Curve

I am trying to manipulate some data that were obtained from a three point load experiment on a porcine tibia. I would like to obtain a stress-strain curve for the various specimens; however, the only ...
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1answer
777 views

Calculate elasticity of rubber balloon

I am developing a model for the respiratory system of a neonate (newborn child) for a BME project by using pressure/volume data of the lungs. To model these, I plan to use a rubber balloon. However. ...
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1answer
2k views

How to generate a synthetic infrared and red LED signal for SPO2 calculation

There are multiple algorithms out there for generating synthetic EKG signals (for test and validation of heart rate estimation algorithms). All you plug in is the desired heart rate, and the algorithm ...
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2answers
2k views

Why does blood pressure cuff size matter?

There are a number of sources that confirm blood pressure cuff size can have a significant impact upon the measured reading. (See 1, 2, 3, 4) The most succinct description I have seen is this: ...
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0answers
88 views

Implications of concatenating EEG signals

I am wondering about the mathematical implications of concatenating very small windows from different trials. All of the trials are the same size, and are for the same period of time after a stimuli. ...
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5answers
1k views

What was that?! Quantifying the impact of a martial arts strike

Measuring things like a martial artist's strike can be challenging because it is a complex motion and common vernacular will use imprecise or incorrect terms. This question is an attempt to identify ...
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2answers
114 views

Can the production rate of labs-on-a-chip ever reach the production rate of silicon chips?

Labs-on-a-chip and silicon chips both have the potential - and in some cases have already reached the potential - to drastically scale down tasks, in these cases performing chemical reactions and ...
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1answer
52 views

How is the long term reactivity of implant materials evaluated?

Various materials are implanted within the human body as a result of of medical need. Dental implants, stabilizing plates, arterial stents, and orthopedic replacements are all common examples where a ...