Abstract: An acoustofluidic device is provided comprising a) a substrate, and b) an ultrasound transducer attached to, or in contact with, the substrate. The substrate and the ultrasound transducer combined have a first set of acoustic natural system resonances determined by the material and the dimensions of the substrate and ultrasound transducer. Each system resonance comprises a resonance frequency and a resonance quality factor. The device further comprises c) a microfluidic cavity provided in the substrate and containing a fluid, the cavity having a second set of acoustic natural cavity resonances, each having a resonance frequency and a resonance quality factor, determined by the dimensions of the cavity and the speed of sound in the fluid. The material and the dimensions of the substrate and ultrasound transducer are selected so that at least one individual cavity resonance has a resonance frequency corresponding to the frequency of a minimum in an impedance spectrum of the ultrasound transducer.

Abstract: An intravenous (IV) catheter system may include a catheter hub, a needle hub and a needle shield. The needle hub may include a needle having a high friction surface part. Furthermore, embodiments may include an open and closed IV catheter system. Embodiments may include a needle hub and a shielded needle system.

Abstract: Disclosed herein is an IV catheter system., comprising a catheter hub (100), a needle hub (200) and a needle shield (300), wherein the needle of the needle hub is provided with a high friction surface part (207). Furthermore, an open and closed IV catheter system is described. Also disclosed is a needle hub (200) and a shielded needle system (600).