"\"Resin-Based Lens Repair and Characterization of a Custom 8-Element Histotripsy Transducer\" data files"

"Custom ultrasound transducer arrays fabricated by stereolithography enable low\u2011cost prototyping of complex geometries, but the long\u2011term durability is limited by resin aging, fragility and lens cracking. This work presents a quantitative demonstration of a resin\u2011based repair protocol for a custom 8\u2011element focused ultrasound array with lens fracture damage after being dropped. The electrical impedance of the array\u2019s piezoelectric elements did not change significantly before and after damage, supporting a repair protocol focused on the acoustic lens alone. A diluted Accura\u00ae 60 resin mixture was injected into surface cracks, cured under ultraviolet light, and post\u2011cured at 60 \u00b0C to achieve watertight sealing. Acoustic output was evaluated by absolute voltage\u2013pressure calibration, needle hydrophone\u2011based beam profiling, and element\u2011wise impedance analysis. The repaired array generated peak compressional and rarefactional pressures within 1.5 dB (16%) of original calibration, with beamwidths (1.1 mm lateral, 7.3 mm axial) modestly broadened. Among the three conditions (before damage, after damage, and after repair), impedance was not significantly different. Taken together, these results demonstrate that resin injection and subsequent curing can restore functional acoustic output and preserve sufficient beam focus for some therapeutic applications. Our results with Accura\u00ae 60 suggest that the approach of solvent dilution and ultraviolet curing can provide a potential cost\u2011effective framework for repairing stereolithography\u2011printed ultrasound devices. This study highlights both the utility and limitations of resin\u2011based repair, underscoring the need for systematic protocols to enable broader adoption of additive manufacturing in therapeutic ultrasound research."