Springfusor 10

[Elijah Rakestraw]

Thespringfusor is a spring driven syringe pump. It consists of a re-useable springunit available in 2 volumes - 10mL and 30mL. Infusion rates are controlled by the FlowControl Tubing. Extension tubing can also be connected directly to the Flow Control Tubing( FCT ) and the FCT to the cannula. Flow Control Tubing is available in a range ofdifferent flow rates.

Not recommended for use where operating parameters better than those specified for thedevice are necessary (eg: accurate infusion of a toxic drug). Not where the low flow ratecould have serious clinical consequences (because of the potential risk of tubingocclusion from particulates). Nor is it recommended where frequent flow rate adjustment isnecessary (eg: dose titration).

Nominal flow rate is calibrated for intravenous infusion of normal saline (unlessotherwise stated) at 25 C to a supine patient. Accuracy of the device is within +/- 20%using the recommended Braun syringes.

Drug, drug concentration and diluent affect flow rate. For example the flow rate ofconcentrated solutions of antibiotics (2g/10ml) is approximately double that of saline.Refer "Viscosity Correction Factor" table for more detail.

The Springfusor can be strapped or bandaged to the arm, over the spring unit, not thesyringe. Alternatively ,extension tubing can be added, and the Springfusor placed in a baghung around the neck, put in a pocket or in pouch and pinned to the clothes.

The infusion time of Flow Control Tubing has been calibrated with normal saline, unlessotherwise labelled. However, drug solution viscosity affects the accuracy of the infusiontime achieved. Viscosity is dependent upon the drug, concentration, diluent andtemperature. The viscosity correction factor is the drug solution viscosity relative tonormal saline, which can be measured according to the method of the Europeanpharmacopoeia. The effect of temperature is discussed in the Springfusor Date Sheet".

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