Assessment of Forces in Intradermal Injection Devices: Hydrodynamic Versus Human Factors
S Verwulgen, K Beyers, T Van Mulder, T Peeters… - Pharmaceutical …, 2018 - Springer
S Verwulgen, K Beyers, T Van Mulder, T Peeters, S Truijen, F Dams, V Vankerckhoven
Pharmaceutical research, 2018•SpringerPurpose The force that has to be exerted on the plunger for administering a given amount of
fluid in a given time, has an important influence on comfort for the subject and usability for
the administrator in intradermal drug delivery. The purpose of this study is to model those
forces that are subject-independent, by linking needle and syringe geometry to the force
required for ejecting a given fluid at a given ejection rate. Material and Methods We extend
the well-known Hagen-Poiseuille formula to predict pressure drop induced by a fluid …
fluid in a given time, has an important influence on comfort for the subject and usability for
the administrator in intradermal drug delivery. The purpose of this study is to model those
forces that are subject-independent, by linking needle and syringe geometry to the force
required for ejecting a given fluid at a given ejection rate. Material and Methods We extend
the well-known Hagen-Poiseuille formula to predict pressure drop induced by a fluid …
Purpose
The force that has to be exerted on the plunger for administering a given amount of fluid in a given time, has an important influence on comfort for the subject and usability for the administrator in intradermal drug delivery. The purpose of this study is to model those forces that are subject-independent, by linking needle and syringe geometry to the force required for ejecting a given fluid at a given ejection rate.
Material and Methods
We extend the well-known Hagen-Poiseuille formula to predict pressure drop induced by a fluid passing through a cylindrical body. The model investigates the relation between the pressure drop in needles and the theoretic Hagen-Poiseuille prediction and is validated in fifteen needles from 26G up to 33G suited for intradermal drug delivery. We also provide a method to assess forces exerted by operators in real world conditions.
Results
The model is highly linear in each individual needle with R-square values ranging from 75% up to 99.9%. Ten out of fifteen needles exhibit R-square values above 99%. A proof-of-concept for force assessment is provided by logging forces in operators in real life conditions.
Conclusions
The force assessment method and the model can be used to pinpoint needle geometry for intradermal injection devices, tuning comfort for subjects and usability for operators.
Springer
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