TissueDB/Materials/Polyvinyl Alcohol

▼This page is a material entry for the SELF Tissue Database.It documents the tissue applications, practical guidance, and related simulators for this material to support low-cost, reproducible surgical simulator development.

Polyvinyl alcohol (PVA) is a water-soluble synthetic polymer that reaches a workshop in more than one form. The form, not the polymer, decides what it can do in simulation.

As a dissolvable support filament it is supplied for fused deposition modelling (FDM) 3D printing. In dual-extruder prints the printer deposits PVA support struts alongside the primary build filament (commonly PLA or TPE), and the finished part is then submerged in water to dissolve the PVA away. Support filament is valuable for internal cavities, overhangs, and complex articulations that cannot be printed in a single pass, and it is consumed during post-processing rather than remaining in the finished part.

As a cryogel or hydrogel it is taken into solution and put through repeated freeze-thaw cycles, which set it into an elastic, self-healing gel. This form behaves in the opposite way to the filament: it is itself the finished part, used as a tissue-mimicking phantom for ultrasound and elastography training, and cast as tubing to stand in for vessels.

Because one form washes away and the other stays in the build, the two are not interchangeable. Check which form a source means before substituting one for the other.

A note on the name. The initials PVA are also used for polyvinyl acetate, the white wood and craft glue sometimes called vinylic glue. That is a different polymer from polyvinyl alcohol and is not the material described on this page.