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Thread: Looking for a miniature self-sealing seal (medical device?)

  1. #1 Looking for a miniature self-sealing seal (medical device?) 
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    I'm looking for a small device that I have in my imagination but I've no idea what it's called! Can anyone help?

    I need it to seal a small (2.5 mm diameter) water pipe with pressure difference of up to 30 kPa. I need to be able to stick a needle (or small tube) in and suck out the water with a pump or syringe (not important what exactly) in order to get rid of any air bubbles in the system. It needs to stay sealed, before, during and after insertion of the needle! Similar I guess to a spors ball valve or a sports drink container. But it needs to be small (about 0.5-1 mm)!

    I imagine a small circular stiff rubber seal split into "leaves" like a pie. When the needle goes in, these "leaves" get pushed inwards but stay sealed. It may have a medical application.

    Does anyone know what I'm talking about? It's driving me crazy!


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  3. #2  
    Forum Ph.D. Leszek Luchowski's Avatar
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    Sounds like what is used in soccer balls (to inflate them, you stick a kind of needle through a piece of rubber).

    Also, why don't you use a valve?


    Leszek. Pronounced [LEH-sheck]. The wondering Slav.
    History teaches us that we don't learn from history.
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  4. #3  
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    Quote Originally Posted by Leszek Luchowski
    Sounds like what is used in soccer balls (to inflate them, you stick a kind of needle through a piece of rubber).

    Also, why don't you use a valve?
    That's a good point, but it needs to be smalllll - I really only have room for a membrane or small plug or something.....
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  5. #4  
    Time Lord
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    If the inside pressure is greater, you don't need to suck anything out. Just create a pinhole or whatever and the water & bubbles will come out by themselves. How about a threaded hole with a screw in it AKA a bleed valve? That can be pretty tiny. The deluxe version sports a little O-ring under the screw head and a flattened or depressed seat for this gasket in the pipe body.
    A pong by any other name is still a pong. -williampinn
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  6. #5  
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    hmm, Im not sure what it is, but i work in medical field so I guess this might help. In neonate peripheral arterial line, we have a port just for drawing blood separated from normal a-line reading. It's kinda greenish rubber type of material. We stick needle in and take it out often. The saline or blood doesnt leak out when we take out the needle, it stays sealed, but it's capable of being punchered thru. I dont know what the material is maybe some sort of silicon? 2.5mm seems tiny even for a needle. Im not sure if it can seal back with such limited quantity in the tube.
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