Grinding Hypodermic Syringes
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  1. #1
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    Default Grinding Hypodermic Syringes

    Hi Folks,
    Does anyone have experience grinding hypodermic syringes to specific angles?

    Cross posted.

    Thanks,

    Payson.

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    My currant supervisor worked for the company that invented the disposable syringes for many years, Sherwood Medical.He told me he ran the grinders.What exactly do you want to know? I think they made their own grinders or modified existing ones.

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    Aren't all, or almost all, syringes made of plastic?

    Surely, grinding wouldn't be the best method of working these?

    Or did you mean grinding the needles?

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    Quote Originally Posted by awander View Post
    Aren't all, or almost all, syringes made of plastic?

    Surely, grinding wouldn't be the best method of working these?

    Or did you mean grinding the needles?
    Well years ago they were cut by a abrasive wheel in a electrolytic solution. the wheel didn't do much of the cutting it was mostly electric. Kind like a wheel EDM.

  5. #5
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    Well this post brought up a memory...I worked at a tool shop when a med student approached us with some products he was developing to help get thru med school.

    I designed some staking tools to support very long, very thin hypodermic needles with surrounding support tubes.
    I asked him how he sharpened the needles...Oh I have some retired ladies doing this in an alley shop. "How do you clean the grindings from the the product? Oh...not needed, everything gets irradiated, so it's all clean"

    Fast forward 10 years and this guy is up on federal charges of providing instruments with foreign objects contained within. He was so advanced in his research that prison time was not suggested.

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    If I Recall correctly, There has been a thread posted on DE-BURRING hypo needles.

    May I suggest you search the forum?

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  9. #7
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    My neighbor is an engineer. He's doing some development work for a medical device client. I'm going to have him join, and pick up the pieces on this. I think he is looking for someone to help with the R&D.
    Thank you,
    Payson.

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    Quote Originally Posted by Flute Maker View Post
    Hi Folks,
    Does anyone have experience grinding hypodermic syringes to specific angles?

    Cross posted.

    Thanks,

    Payson.
    Please don't "cross post"...

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    In a previous life I worked in a medical physics depd. Had to make a device as in 1st post. Now this will make your eyes water.

    A 7/8 of a circle of 1/16" hypo tube in a Perspex holder. This was for butt end CA treatment. The small od tubes had radioactive Iridium wire inside for treatment. To be in place for 7 days.

    To sharpen these we put a filler wire inside and just lapped them to the same style as big hypo needles. So no burr on inside.

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    Apologies.


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