Boston Scientific announced FDA 510(k) clearance of SpaceOAR Flex Hydrogel on September 25 under K262151. The device places a temporary gel spacer between the prostate and the anterior rectal wall, so radiation aimed at the prostate misses rectal tissue.

The change from SpaceOAR Vue is procedural. Flex ships in a single syringe. The physician can pause partway through the injection, look at how the gel has spread, and adjust before continuing. Setup takes fewer steps than earlier models. The gel stays visible on CT, including kV cone beam CT, so it shows up on the image guidance already running in the treatment room.

This reads as a human factors clearance more than a materials one. The hydrogel chemistry is not the news. The ability to stop and correct a misplacement is. Anyone writing a 510(k) around a delivery change should expect the reviewer's questions to land on use-related risk analysis rather than biocompatibility. Limited US release comes later in 2026.