I haven't seen a needle with a ruling on it, yet I have read a study saying they researched the difference between a 1/4 inch and a 1/2 inch penetration depth and could now refer the new 1/4 inch for approval.
It seems like practitioners, and particularly developing world medical people could benefit from putting depth lines on hypodermic needles.
Who knows, perhaps it moves the efficacy 5% That is big when you consider an entire country.-- beanangel, May 07 2018 Depth stop for punctures. https://www.ted.com..._moments_in_surgery [2 fries shy of a happy meal, May 08 2018] Prior art http://medent.usyd....20annulirostris.htm [spidermother, May 11 2018] What is this "inch" you refer to ?
// when you consider an entire country. //
Giving an entire country an injection sounds like a challenge, although it is possible to give an entire country an enema once the national anus has been located. In the case of france, this is comparatively easy.-- 8th of 7, May 07 2018 This is not, in fact, an entirely stupid idea. It also eschews the use of "at". Hence [+].-- MaxwellBuchanan, May 07 2018 What would you propose as the material of choice for the marks?
8th, doesn’t it occur to you that with 1/4” markings, there would be fewer gradations than with 1 mm markings, causing the injectee to panic less as it plunges ever deeper?
Oh, what am I saying, of course you have. Must remember with whom I am talking.-- RayfordSteele, May 07 2018 Doesn't sound dispractical. Could be a confeasible nonunilantiintelligent idea.-- doctorremulac3, May 07 2018 Depth markings on other types of needles such as biopsy needles appears to be known (from a quick Google search).
I couldn't find anything for normal hypodermic needles. However, I think what might be more practical would be a depth stop rather than depth markings.-- xaviergisz, May 07 2018 <looks at the steel ruler I bought last year, one side metric, other side inches> Yep. there are still people who are on feet and inches.
[+] for two explicable and good ideas-- not_morrison_rm, May 08 2018 //what might be more practical would be a depth stop// Actually, that's a good point. If a needle is meant to penetrate to a depth of 8mm, why not use an 8mm long needle?-- MaxwellBuchanan, May 08 2018 (+) Depth stop after puncturing skin or bone is a huge problem.
Cool TED talk by the guy who figured out the solution. [link]
It was hard to find. You'd think it would be at least one of the hits for the word 'needle'.-- 2 fries shy of a happy meal, May 08 2018 simple[+] The downside is that the most painless jab is a fast one, and it takes experience to learn that. A doctor trained to slowly push in to the right mark will be giving painful shots his whole career.-- Voice, May 11 2018 //what might be more practical would be a depth stop//
What about a needle whose length is adjustable? Just dial or otherwise adjust it to the appropriate measurement and jab away without having to think about it.-- doctorremulac3, May 11 2018 //jab away without having to think about it //
But that's what medics do anyway ...-- 8th of 7, May 11 2018 Everyone is different. There still has to be some individual patient referencing to know what the marks mean.-- wjt, May 11 2018 random, halfbakery