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Avoiding Air Bubbles In Insulin Pens?
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<blockquote data-quote="kitedoc" data-source="post: 1831563" data-attributes="member: 468714"><p>Just to provide a perspective from an<strong> 'insulin pumper'</strong> ( ? good name for a T shirt?), I draw up insulin from a pen cartridge (one in a pen device) into a pump cartridge/reservoir/syringe.. Even <strong>drawing up from the pen cartridge full there is some air </strong>(dead space)<strong> in the pump syringe </strong>which swirls about. I think that the <strong>drawing back</strong> on the pump syringe plunger <strong>creates a lot of suction</strong>, as the rubber plunger on the pen cartridge has to move/slide/be drawn down the glass tube. I think (without scientific certainty) the<strong> suction pressure draws more air out of the insulin itself</strong>.</p><p>With myAnimas <strong>pump syringe</strong> even held upright with a traditional needle which does not protrude into the syringe,<strong> it difficult to</strong> <strong>rid air bubbles from it</strong>. <strong><em>Rapid tapping just seems to break up the air bubbles</em></strong>, makes it <strong><em>more difficult to get every single one out. </em></strong></p><p><strong><em>In the 'good, old days' when mixing short and long-acting insulin in the same syringe for injection, too rapid a shaking led to air bubbles forming in the mix. We were taught to roll the syringe horizontally to and fro as a gentler form of mixing</em></strong></p><p>But there are <strong> two 'saving graces'</strong>: 1) In the pump cartridge changeover <strong>the tubing of the needle insert needs to be filled</strong>, so the <strong>pump pushes insulin and hopefully any air bubbles from the pump cartridge out</strong>. 2) an <strong>air bubble in the tubing sets out an obstruction alarm </strong>- bit of a pain as you have to flush the tubing out.</p></blockquote><p></p>
[QUOTE="kitedoc, post: 1831563, member: 468714"] Just to provide a perspective from an[B] 'insulin pumper'[/B] ( ? good name for a T shirt?), I draw up insulin from a pen cartridge (one in a pen device) into a pump cartridge/reservoir/syringe.. Even [B]drawing up from the pen cartridge full there is some air [/B](dead space)[B] in the pump syringe [/B]which swirls about. I think that the [B]drawing back[/B] on the pump syringe plunger [B]creates a lot of suction[/B], as the rubber plunger on the pen cartridge has to move/slide/be drawn down the glass tube. I think (without scientific certainty) the[B] suction pressure draws more air out of the insulin itself[/B]. With myAnimas [B]pump syringe[/B] even held upright with a traditional needle which does not protrude into the syringe,[B] it difficult to[/B] [B]rid air bubbles from it[/B]. [B][I]Rapid tapping just seems to break up the air bubbles[/I][/B], makes it [B][I]more difficult to get every single one out. In the 'good, old days' when mixing short and long-acting insulin in the same syringe for injection, too rapid a shaking led to air bubbles forming in the mix. We were taught to roll the syringe horizontally to and fro as a gentler form of mixing[/I][/B] But there are [B] two 'saving graces'[/B]: 1) In the pump cartridge changeover [B]the tubing of the needle insert needs to be filled[/B], so the [B]pump pushes insulin and hopefully any air bubbles from the pump cartridge out[/B]. 2) an [B]air bubble in the tubing sets out an obstruction alarm [/B]- bit of a pain as you have to flush the tubing out. [/QUOTE]
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