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FDA makes the Draeger VentStar Resus Neo hose removal a Class I recall Control Bionics wins a Class I CE mark for the NeuroStrip muscle sensor Medicare starts paying for Carlsmed Aprevo lumbar fusion under three new codes ABK Biomedical breaks ground on a Missouri plant for its Y90 microspheres Boston Scientific releases the last $8M from Elutia's BioEnvelope sale BlueWind gets a Category I CPT code for subfascial tibial neuromodulation Emboline runs its first US commercial Emboliner cases at Columbia SedMed raises $4M for a toilet lift that runs without power CDRH plans 11 final guidances in FY2027 and puts AI lifecycle management first FDA makes the Draeger VentStar Resus Neo hose removal a Class I recall Control Bionics wins a Class I CE mark for the NeuroStrip muscle sensor Medicare starts paying for Carlsmed Aprevo lumbar fusion under three new codes ABK Biomedical breaks ground on a Missouri plant for its Y90 microspheres Boston Scientific releases the last $8M from Elutia's BioEnvelope sale BlueWind gets a Category I CPT code for subfascial tibial neuromodulation Emboline runs its first US commercial Emboliner cases at Columbia SedMed raises $4M for a toilet lift that runs without power CDRH plans 11 final guidances in FY2027 and puts AI lifecycle management first

Series D

Zenflow raises $52M and hands Cook Medical US distribution for the Spring implant

MedDevice Startups Staff · 1 day ago · 2 min read · Via Zenflow release

Zenflow raised a $52 million Series D led by Cook Medical, announced October 5. Cook also takes exclusive US distribution rights to the Zenflow Spring.

ClavystBio invested for the first time. Invus Opportunities, F-Prime and Medtech Venture Partners returned. HSBC Bank USA and Trinity Capital provided debt alongside the equity. Zenflow is based in South San Francisco.

The Spring is a nitinol implant that props open a urethra narrowed by benign prostatic hyperplasia. A physician places it through a single-use flexible cystoscope with an integrated positioning balloon, without general anesthesia or an incision, and can remove it later. FDA approved it by PMA in December 2025 as a first-line interventional therapy.

Letting the lead investor take the sales channel is the trade. Zenflow gets a urology field force it would have spent years hiring. Cook gets a first-line BPH device without having run the PMA itself.

Questions & Answers

How much did Zenflow raise in its Series D?

Zenflow raised $52 million in a Series D announced on October 5, 2026. Cook Medical led the round.

Who distributes the Zenflow Spring system in the United States?

Cook Medical holds exclusive US distribution rights to the Zenflow Spring system under an agreement announced alongside the $52 million Series D.

Is the Zenflow Spring FDA approved?

Yes. FDA approved the Zenflow Spring implant and delivery system through the PMA pathway in December 2025 for benign prostatic hyperplasia.

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