18 gauge needle

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18 gauge needle

Postby cptarmynurse » Tue Apr 06, 2004 3:24 am

Hi,
I hope someone might be able to help. I need to know if anyone knows the size in microns of the lumen of an 18 gauge syringe needle, or any other unit of measurement that I can convert to microns.

Thank you,
John
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Re: 18 gauge needle

Postby Knight » Wed Apr 07, 2004 12:59 am

cptarmynurse wrote:Hi,
I hope someone might be able to help. I need to know if anyone knows the size in microns of the lumen of an 18 gauge syringe needle, or any other unit of measurement that I can convert to microns.

Thank you,


I found a site at http://www.evergreen.edu/biophysics/technotes/fabric/syringe.htm that gave information on the dimensions of syringes based on their gauge. According to that site, an 18 gauge needle has an inner diameter (lumen) of 0.838 mm. You're asking for the size in microns, which is a depreciated unit equal to 1 x 10 -6 meters. The unit in current usage is the micrometer. (µm)

One mm is equal to 1000 µm. Accordingly, 0.838 mm is equal to 838 µm.

I hope this helps.
William J. Knight
Health Physicist
Los Alamos National Labs
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Postby cptarmynurse » Fri Apr 09, 2004 1:11 am

Thank you so much this will help out a lot, I am trying to write a research grant and this will provided support for my idea.

Thank you
John
John
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Re: 18 gauge needle

Postby spal » Wed Oct 14, 2009 4:28 am

Hi,
How about internal and external diameters for plastic cannulas (which come with needles to aid insertion)?
I'm looking for the smallest cannula in the world and it's internal and external dimensions if anyone has any suggestions!
It's for eye surgery.
Thanks
spal
 

Re: 18 gauge needle

Postby lm » Thu Nov 26, 2009 11:01 pm

ISO 10555 Part 5 will give you all the dimensions of the outside tubing.
lm
 


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