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Under or Over infusion?
#26546 13/11/07 5:27 PM
Joined: Sep 2004
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Rob1234 Offline OP
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If a Terumo 2.5ml was fitted to a syringe driver that then recognised it as a BD 3.0ml syringe, would the result be under or over infusion?



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Re: Under or Over infusion?
Rob1234 #26547 13/11/07 5:52 PM
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I would expect it to result in an under-infusion (ie, less volume delivered). smile


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Re: Under or Over infusion?
Geoff Hannis #26553 13/11/07 10:35 PM
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It depends upon the internal diameter of the different syringe types. If the Terumo 2.5ml syringe has a smaller internal diameter than the BD 3.0ml syringe, then an under-infusion would result as Geoff has stated.

A syringe driver has a "look-up table" of syringe brands and types and uses this table to translate the linear travel of the plunger mechanism into a volume delivered. If the internal diameter is reduced, the linear travel must be faster to achieve the same delivery rate.

(To be a little more specific, if you halve the internal diameter of the syringe, you must increase the rate of linear travel of the plunger by a factor of four to achieve the same delivery rate.)

Last edited by BSM; 13/11/07 10:38 PM. Reason: Addition
Re: Under or Over infusion?
BSM #26562 14/11/07 9:09 AM
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Rob1234 Offline OP
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Thanks guys, this is what I suspected.

Is syringe data (outside & inside diameters) for the various types available anywhere apart from the manufacturers?



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Re: Under or Over infusion?
Rob1234 #26576 14/11/07 1:13 PM
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Use a vernier to measure the diameters.

Have you actually ran the pump with the wrong syringe and measured the output over the hour.



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