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Message: <blockquote data-quote="Jaylee" data-source="post: 1252727" data-attributes="member: 101136">Hi,I'm not sure about the disposable pens. I've only ever used the reusable.However the "bung" in the insulin cartridge would need to be attached/stuck to the "ram" in the pen to cause this "sucking phenominom" to happen as the pen mechanism "slacks off" after full depression administering the dialed dose...?But, the disposable pen would need taking apart to investigate if this is a cause..??Another theory. (To which I've noticed recently with a couple of the 4mm BD micofine.) is the disposable needle slides (is not held well) in the plastic screw cap? (A production issue.) Though the needle punctures the membrane on the cartridge it also moves out with the resistance, making it a little longer.. If this was not noticed & used? The needle could possibly push back in with the skin resistance, "concaving" the cartridge membrane. Thus on withdrawal of the needle after the dose causing a small amount of suction due to the change in pressure within the cartridge....?Just ideas.. Without looking at your set up. Hard to tell.!</blockquote>

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