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Message: <blockquote data-quote="kitedoc" data-source="post: 1965470" data-attributes="member: 468714">Hi [USER=387645]@johnpol[/USER] and [USER=329563]@Shiba Park[/USER], As a pumper for 7 years, (out of 52 years on insulin, not as professional advice or opinion:I have had small bruises with slight swelling after some cannula insertions or removal and small blood leaks. I have also had bruising after accidentally bumping or scraping a cannula port against a hard surface.Also this was more likely on the few occasions when I tried my outer thigh for the cannula rather than my stomach ? more blood vessels there ??All I can think of  is that there is always a small risk that one could pierce a larger than usual blood vessel during insertion or removal of the cannula.  And maybe a cannula finds its way partly into a blood vessel or close by and on removal the 'flood gates' open. And without a way of directly seeing what is happening it is only after the event that one knows.In theory an ultrasound scanning might see how close the cannula is to a blood vessel under the skin as well as if the cannula had gone deep enough to pierce the barrier between under-the-skin tissue (called subcutaneous) and muscle. I understand that muscle has lots of blood vessels.As an aside I have once inserted a 90 degree cannula with the firing device that pushes the cannula through into and through the skin. Because of the design the tubing is attached. I then removed the tubing to fill it via the pump and found it would not fill. The poor pump kept working away but no drops appeared at the end of the tubing. It turned out that a small amount of blood had come up the cannula and into the connecting device. I had missed seeing it in the small window there. By the time I had detached the tubing from the cannula site to fill it the blood had clotted and stopped the tubing being fulled.They say that cannula problems are the most frequent problems in insulin pumps. Hopefully things can be improved over time and with feedback to the manufacturer!!</blockquote>

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