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Accuracy in Patch Pump Therapy

Patch pump therapy is a convenient method of drug administration. The devices can be worn directly on the body, no tubing has to be attached, and the cannula or needle is inserted automatically. They are often equipped with programmable delivery patterns, which allow high flexibility and a rational adjustment to the patient’s needs. In turn, the patch pumps must fulfil the highest criteria in dosage accuracy and safety. The fluidic path through the whole device, including body resistance at the injection site combined with the physical properties of the drug, define the pressure loss that the pump needs to overcome. Since smaller needles are more comfortable and, therefore, preferred, they often represent the bottleneck of the system.

Viscosity Range of Suitable Medication

Many common drugs for patch pump therapy are aqueous solutions in the range of 1cP to 30cP. Fluids with higher agent concentration or larger molecules may reach up to 50cP or even higher. This often requires large needle diameters or significantly lower flow rates.

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Michael Girschweiler has worked at Sensile Medical since 2017. Michael is Technical Project Leader in the field of micropump development and an expert in the company’s pump core technology. He has a Bachelor’s degree in Mechanical Engineering and worked as Research Assistant at the Institute of Thermal and Fluid Engineering at the University of Northwestern Switzerland, mainly in FEM and CFD simulations of thermomechanical projects.
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Michael Girschweiler
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