Aliso Viejo, Calif. – September 29, 2026 – Terumo Neuro today announced that it has signed an agreement to acquire Arsenal Medical Inc., a privately held, clinical-stage biomaterials company developing NeoCast™, an investigational next-generation liquid embolic technology for the treatment of chronic subdural hematoma (cSDH). Upon completion, the proposed acquisition would expand Terumo Neuro’s liquid embolic portfolio, advance its strategy to bring differentiated neurovascular technologies to physicians and patients, and support its continued focus on innovations to preserve and restore brain health.
“NeoCast represents a compelling opportunity to advance what could be a game-changing innovation in the treatment of chronic subdural hematoma,” said Carsten Schroeder, CEO, Terumo Neuro. “As MMA embolization emerges as an important new treatment option, this purpose-developed, next-generation liquid embolic technology has the potential to make a meaningful impact for physicians and patients, while supporting our mission to preserve and restore brain health. We are impressed by the progress Arsenal Medical has made and look forward to combining our global neurovascular expertise with its differentiated technology platform following the close of the transaction.”
cSDH is a significant and growing neurological condition, particularly among aging populations. The condition may cause cognitive decline and disability, has been described as a potential cause of reversible dementia, and can be associated with substantial mortality within one year. While surgical drainage remains a common treatment approach, recurrence after surgery continues to be a clinical challenge. Middle meningeal artery embolization has emerged as a promising adjunctive or alternative approach by targeting the vascular pathology believed to contribute to hematoma persistence and recurrence.