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Questions tagged [medical-devices]

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What would be a good way to connect parts that would be replaced on a training model?

I'm trying to work on a training model for neurosurgery. Residents will be operating on the posterior part of the model, and it needs to be replaced after each training session. While the anterior ...
Bilal Bahadır Akbulut's user avatar
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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 ...
Bortamus's user avatar
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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 ...
lok lok's user avatar
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What pressure sensor and how should it be installed on to the medical ventilator to get the pressure flow graph?

I'm currently building a project named camshaft mechanism medical ventilator. One of the objective of my project is to get the pressure flow graph from my user. I succesfully build my camshaft. ...
brian's user avatar
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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 ...
Mihai M.'s user avatar
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Cost effective hand held medical scanner

I am currently doing a summer project where I am tasked with taking precise measurement of skin deformations, whether it be wounds or pimples, the measurement of the z-axis depth is what I am ...
tigerhoang03's user avatar
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41 views

Can an IV laser cause eye damaged when used intraorally?

Here are the specs for the laser https://summuslaser.com/lasers/lasers-horizon-medical/ It has a dental attachment. When used intraorally and the tip is pointed to the roof of the mouth, I can see the ...
user567068's user avatar
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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 ...
Ben Kirwan's user avatar
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ecg cable is there any different from brand to another

i have this device but ecg 3 lead cable is missing my question can i use different brand ecg cable for this device the second picture plug I have the last picture is missing can i use different ...
ioen jid's user avatar
1 vote
0 answers
347 views

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 ...
Lazarus's user avatar
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1 answer
414 views

Hack a kitchen freezer for lower temperature

Common home freezers usually have the lowest temperatures of about -24 degrees Celsius. Freezers that go lower exist but these are much more expensive (times much). I wonder whether a common kitchen ...
Kozuch's user avatar
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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 ...
Adnan Sabbir's user avatar
-1 votes
1 answer
306 views

Complexity of Medtronic respirator vs. DIY

Now that Medtronic has open sourced (WIP reportedly for its completeness) the design of a ventilator, the following question to experts in medical engineering with specialization on lung ventilators. ...
J. Doe's user avatar
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4 votes
2 answers
108 views

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 ...
today's user avatar
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1 answer
496 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 ...
Antoni Parellada's user avatar
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1 answer
137 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 ...
scarroll's user avatar
6 votes
1 answer
98 views

Why do modern MRI scanners use an axial static field?

Last night I was reading some fascinating history of the first full-body MRI scanner and noticed that it's fundamentally different from modern scanners in one particular way: the static B field is ...
Bernd Jendrissek's user avatar
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2 answers
50 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 ...
bearoplane's user avatar
2 votes
1 answer
70 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 ...
LynxLynx's user avatar
1 vote
0 answers
43 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 ...
Macus Little's user avatar
0 votes
2 answers
94 views

How many decibels does wind buffering reduce from ear muffs protection?

I have a hearing condition and need to wear ear muffs on my scooter. My muffs are 3M Peltor with a dB rating of 35dB. When riding my bike, the combined noise from the engine and the wind is about ...
Bruno  Vincent's user avatar
2 votes
0 answers
826 views

IV drip/flow rate controller design

I have a question about intravenous flow rate controllers, which are controlled using microprocessors. For example: I want to control the IV flow rate, the flow is in range from 0 to 300. So, I just ...
rafifadl's user avatar
4 votes
1 answer
2k 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. "...
6equj5's user avatar
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3 votes
1 answer
150 views

Could a medical ultrasound device be used for recording the topography of a small river?

I work as a research assistant in the field of water resources management. We build small scale physical models of rivers and make experiments with sediment. The model rivers are about 20m long and 3m ...
Mathias's user avatar
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3 votes
3 answers
105 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?
user3489's user avatar
3 votes
1 answer
2k views

What is the purpose and cause of disposable syringes being single use only?

What's the mechanism behind disposable syringes jamming? How do you prevent this from happening or reverse the effect? They are a lot cheaper. The problem is that once the syringe is pressed all the ...
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