ZENFLOW, INC.

SOUTH SAN FRANCISCO, CA · Founded 2014 · Medtech · Private

A single-wire nitinol coil implant with transurethral delivery system for treating benign prostatic hyperplasia

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Updated Oct 23, 2026 · zenflow.com

Sector: Medtech
Headquarters: SOUTH SAN FRANCISCO, CA
Founded: 2014
Latest Form D: $19.4M, Nov 2024
Total capital: $57.5M

Federal grants: $3.4M; 5 awards · 2015–2020; Rank in peer group#285 of 538
Private capital raised: $54.1M; 3 Form D · last Nov 2024; 23 months since last filing
Federal contracts: None on recordNo federal contract awards found.
Granted patents: 12; 22 pending · first 2021; Rank in peer group#51 of 538

Capital timeline

Latest events

Nov 2024Private capital raisedForm D · SEC · 3rd filing$19.4M
Apr 2021Private capital raisedForm D · SEC · 2nd filing$23.7M
Jul 2020Federal grantHealth and Human S · Phase II · Improvement and validation of the Spring System for Permanent Relief of Urinary Obstruction related to Benign Prostatic Hyperplasia (BPH)$557K
Sep 2019Federal grantHealth and Human S · Phase II · Improvement and validation of the Spring System for Permanent Relief of Urinary Obstruction related to Benign Prostatic Hyperplasia (BPH)$714K
Jul 2018Federal grantHealth and Human S · Phase II · Spring System for Permanent Relief of Urinary Obstruction related to Benign Prostatic Hyperplasia$637K
Oct 2017Private capital raisedForm D · SEC · 1st filing$11M
Sep 2017Federal grantHealth and Human S · Phase II · Spring System for Permanent Relief of Urinary Obstruction related to Benign Prostatic Hyperplasia$1.3M

Show 1 earlier federal award

Jun 2015Federal grantNSF · Phase I · SBIR Phase I: Development of a device for permanent relief of urinary obstruction related to benign prostatic hyperplasia$180K

Node area is scaled to amount. Form D reports securities sold, which can differ from an announced round; filings are numbered in the order they were made.

Federal first

27months

from ZENFLOW, INC.’s first federal award to its first private round.

First federal award · Jun 2015: NSF · $180K
First Form D · Oct 2017: $11M · 1st Form D
Awards before first raise: 2 awards

An association in public records, not a cause or a prediction.

Standing among 538 peers

Line = median

Medtech · Device

Federal grantsBelow median
Granted patents#51 · top 9%

Cumulative measures favor older companies. Rankings describe position today, not outcome. Below the median, ranks show as a band rather than a number.

Founders and team

Researcher links verified by same-company patents and grants

Shreya MehtaResearcherExecutive Officer, DirectorLinked by 1 patent
Nicholas DamianoResearcherExecutive Officer, DirectorLinked by $3.4M in grants as PI
Andrew CleelandDirectorNamed in SEC Form D filings
Blayne RoederDirectorNamed in SEC Form D filings
Bryan KimDirectorNamed in SEC Form D filings
John BeckExecutive OfficerNamed in SEC Form D filings

Show all 10 people

Nick DamianoExecutive Officer, DirectorNamed in SEC Form D filings
Radu CautisDirectorNamed in SEC Form D filings
Robert WeisskoffDirectorNamed in SEC Form D filings
Susan StimsonDirectorNamed in SEC Form D filings

What it has protected

USPTO · 12 granted of 34

Aug 25, 2026GrantedSystems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraUSPTOUS 12,714,587
Aug 18, 2026GrantedSystems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraUSPTOUS 12,708,535
Jul 23, 2026PendingMethods For Deployment Of An ImplantUSPTOApplication 19395877

Show all 34 patent records

Systems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraAug 25, 2026 · US 12,714,587Granted
Systems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraAug 18, 2026 · US 12,708,535Granted
Methods For Deployment Of An ImplantJul 23, 2026 · Application 19395877Pending
Systems, Devices, And Methods For Expanding The Diameter Of The Prostatic UrethraJul 23, 2026 · Application 19300915Pending
Systems And Methods For Implants And Deployment DevicesJul 21, 2026 · US 12,685,654Granted
Methods For Deployment Of An ImplantJan 15, 2026 · Application 19334221Pending
Methods For Deployment Of An ImplantJan 15, 2026 · Application 19334242Pending
Systems, Devices, And Methods For The Retrieval Of An Implant In The Prostatic UrethraDec 4, 2025 · Application 19303793Pending
Systems, Devices, And Methods For The Retrieval Of An Implant In The Prostatic UrethraSep 16, 2025 · US 12,414,850Granted
Methods For Deployment Of An ImplantJul 10, 2025 · Application 18810238Pending
Systems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraApr 10, 2025 · Application 18736097Pending
Systems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraOct 17, 2024 · Application 18392316Pending
Systems, Devices, And Methods For Expanding The Diameter Of The Prostatic UrethraSep 26, 2024 · Application 18589876Pending
Methods For Deployment Of An ImplantSep 17, 2024 · US 12,090,040Granted
Systems And Methods For Implants And Deployment DevicesJul 11, 2024 · Application 18378301Pending
Systems, Devices, And Methods For The Accurate Deployment Of An Implant In The Prostatic UrethraJun 4, 2024 · US 11,998,438Granted
Methods For Deployment Of An ImplantMay 23, 2024 · Application 17989112Pending
Methods For Deployment Of An ImplantFeb 20, 2024 · US 11,903,859Granted
Systems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraFeb 15, 2024 · Application 18378940Pending
Systems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraFeb 6, 2024 · US 11,890,213Granted
Systems And Methods For Implants And Deployment DevicesNov 14, 2023 · US 11,813,184Granted
Systems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraOct 3, 2023 · US 11,771,575Granted
Systems, Devices, And Methods For The Accurate Deployment Of An Implant In The Prostatic UrethraAug 24, 2021 · US 11,096,774Granted
Systems And Methods For Implants And Deployment DevicesMar 23, 2021 · US 10,952,885Granted
Systems, Devices, And Methods For Expanding The Diameter Of The Prostatic UrethraOct 15, 2020 · Application 16738485Pending
Systems And Methods For Implants And Deployment DevicesApplication PCTUS2017028677Pending
Systems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraApplication 18239865Pending
Systems, Devices, And Methods For The Retrieval Of An Implant In The Prostatic UrethraApplication PCTUS2021053904Pending
Systems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraApplication PCTUS2020060989Pending
Systems, Devices, And Methods For The Retrieval Of An Implant In The Prostatic UrethraApplication 63089205Pending
Systems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraApplication 62937625Pending
Systems, Devices, And Methods For The Accurate Deployment And Imaging Of An Implant In The Prostatic UrethraApplication PCTUS2019032637Pending
Systems, Devices, And Methods For Expanding The Diameter Of The Prostatic UrethraApplication PCTUS2018044180Pending
Systems, Devices, And Methods For The Accurate Deployment Of An Implant In The Prostatic UrethraApplication PCTUS2017065469Pending

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Regulatory activity · Medtech

Sector-level, not company-level

07 Jul 2026New Animal Drugs; Approval of New Animal Drug Applications; Withdrawal of Approval of New Animal Drug Application; Change of SponsorFood and Drug Administration
30 Jun 2026Medical Devices; General and Plastic Surgery Devices; Classification of the Skin Patch for Treatment of HyperhidrosisFood and Drug Administration
30 Jun 2026Medical Devices; Anesthesiology Devices; Classification of the Monitor for Opioid Induced Impairment of OxygenationFood and Drug Administration
29 Jun 2026Medical Devices; Orthopedic Devices; Classification of the Medial Knee Implanted Shock AbsorberFood and Drug Administration
26 Jun 2026Medical Devices; Neurological Devices; Classification of the External Lower Extremity Nerve Stimulator for Restless Legs SyndromeFood and Drug Administration
26 Jun 2026Medical Devices; General Hospital and Personal Use Devices; Classification of the Infant Supine Sleep SystemFood and Drug Administration

Rules are matched to sector, not to company. Recent activity in a sector is context rather than a signal about this business — until rules are matched to what a company actually builds, the section is shown as context and nothing more.

Sources

Federal grants from SBIR/STTR, NIH, NSF and DoD records. Federal contracts from USAspending.gov. Private capital from SEC Form D. Patents from USPTO. Publications from OpenAlex. Regulatory activity from the Federal Register. Press matched on company name.

How to read this page

Figures show associations in public records, not causes or predictions. Nothing here is investment advice. An em-dash means no record was found under this company's name, not that none exists.

Data freshness

SEC Form D filings through Oct 23, 2026. SBIR and STTR awards through Oct 21, 2026.