Phantom Cannula Siêu Âm (Ultrasound Cannula Phantom)

A low-cost ultrasound phantom for teaching ultrasound-guided cannulation.

The housing is a two-part PETG box. The lid has a pour hole for filling with agar gel; the base holds balloon targets in position via small pegs. Uninflated party balloons filled with water and red food colouring sit wound around the pegs and act as vessel targets — the balloon wall provides realistic needle resistance, and the red dye gives immediate visual feedback on successful puncture.

Fill with agar gel (5% agar by weight, plain flour for ultrasound scatter, xanthan gum for viscosity, red food colouring), heated to 90°C, cooled to ~60°C with stirring, poured in, and set overnight in the fridge. When the gel degrades, dissolve and replace for pennies.

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