A polyether-urethane-based balloon implant deployed in 7 pigs demonstrated structural stability and biocompatibility over 24 weeks, with no evidence of degradation or significant inflammation.
Does a polyether-urethane-based balloon implant demonstrate long-term biostability and biocompatibility when deployed adjacent to the tricuspid valve annulus in a porcine model?
Polyether-urethane-based balloon implants demonstrate long-term biostability and biological safety in a dynamic porcine cardiac environment, supporting their potential use in catheter-delivered structural heart interventions.
Polyurethane-based implantable devices (PUIDs) delivered via catheter are increasingly used in structural heart interventions; however, limited in vivo data exist regarding their long-term biostability and biological safety. This study evaluated a balloon-shaped implant made of Pellethane®, a polyether-based polyurethane, designed as a three-dimensional intracardiac spacer and deployed via percutaneous femoral vein access. The device was chronically positioned adjacent to the tricuspid valve annulus in seven pigs for 24 weeks. Explanted devices and surrounding tissues were evaluated through material characterization (SEM, GPC, FT-IR, and 1H-NMR) and histological analysis. SEM and FT-IR confirmed preserved surface morphology and chemical bonds, GPC showed stable molecular weight, and 1H-NMR revealed intact urethane and ether linkages. Materials characterization revealed no evidence of hydrolytic or oxidative degradation, indicating structural stability of the devices. Histological analysis showed stable device positioning with minimal thrombosis or inflammatory response. Biocompatibility was confirmed via ISO 10993-1:2018 Standard (International Organization for Standardization (ISO): Geneva, Switzerland, 2018), and extractable substances were evaluated under exhaustive extraction conditions specified by ISO 10993-18:2020 (International Organization for Standardization (ISO): Geneva, Switzerland, 2020), with no toxicologically significant findings. These findings support the long-term biostability and biological safety of the PUIDs in dynamic cardiac environments, informing future design criteria for catheter-delivered cardiovascular devices.
Kim et al. (2026) studied this question. Polyether-urethane-based balloon implant (Pellethane®) was evaluated on Long-term biostability and biological safety. A polyether-urethane-based balloon implant deployed in 7 pigs demonstrated structural stability and biocompatibility over 24 weeks, with no evidence of degradation or significant inflammation.