Luer Taper Tolerances - 6% or otherwise - Dimensional Accuracy

M

micaudwell

#1
Would anyone care to share their experience of the dimensional accuracy of the conical Luer fittings that I perhaps naively believed should have an included angle represented by a 6% slope?

Briefly, we have an issue relating to the mating of an OEM supplied female Luer non-return valve with 'standard' disposable syringes as found ubiquitously throughout the world's healthcare system.

Until very recently I had not needed to consult ISO 594/1 which describes typical dimensions of male and female conical fittings and goes on to describe the requirements in terms of gauging, air & liquid leakage, separation force and stress cracking. So far so good.

However having assembled a collection of disposable syringes made by five different manufacturers and measured the dimensions of the male conical fittings using Vernier callipers it is clear that that actual included angles of this admittedly small sample vary from 4.25 to 5.14%. These items may all meet the gauging and other requirements of the standard, but they certainly don't approach 6%. I do not possess the requisite ring and plug gauges to assess this point at present. Clearly fittings with a more acute angle than nominal would be expected to enter into a mating fitting further than one closer to the nominal.

Is it possible that a female fitting similarly departing from the nominal in the obtuse direction, but still meeting the requirements of the standard would result in the two components bottoming out before a secure joint is made?

Is the range of angles represented by my sample common or expected and would they normally be expected to mate satisfactorily with female fittings that might exhibit a similar variability?

Any experience that you might care to share will be gratefully received.

Mike
 
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O

Outsider

#3
My experience with luer tapers is similar to what you have discovered by your sample measurements. I have found that most polyethylene and polypropylene syringes have a more acute angle and fool the ring gauge by accurately falling within the requirements of the major diameter (.170") but falling low on the minor diameter at the .250" length.

I think the practical reason is that the PE and PP materials will deform as they are compressed within the female mating component causing taper contact.

We typically use a luer taper gauge and compress to a known value (5 lbs) to accept No/No-Go.

Glass and metal are most always right on accurate.
 
M

micaudwell

#4
Thnaks for sharing your experience. I will post again if I get any further with my enquiries.

Mike
 
M

micaudwell

#5
An informative set of videos on the subject of using ISO 594 gauges have recently been posted on YouTube - search for gagecrib and 594 and it should take you right there.

I have no connection with this provider.

Mike
 

Wayne

Gage Crib Worldwide
#8
An informative set of videos on the subject of using ISO 594 gauges have recently been posted on YouTube...
:thanx: for the nice complement. The fingers and voice on the videos are mine :eek:.

My plan is to remove the videos from YouTube and post them directly on my website along with multiple photos of the of the gages and reference fittings. Look here for those related to ISO 594/1. Look here for those related to ISO 594/2.

You will also find usage instructions being added over time. I have already posted usage instructions for ISO 594/1 Figures 3A, 3B, and 3C.

The links above are the main index for the information/photos/videos about the gages and reference fittings.

I really hope you find this information helpful.:)
 
T

TNHunter

#9
Does anyone know of a calibration source for these gages. I am having a hard time finding someone who is even knowledgeable about the ISO594/1-1986 requirement.:confused:
 
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