THUNDER Study Demonstrates Penumbra's THUNDERBOLT is Safe and Effective for Stroke Care
Rhea-AI Summary
Penumbra (NYSE:PEN) reported top-line results from THUNDER, a U.S. Investigational Device Exemption study evaluating its THUNDERBOLT computer assisted vacuum thrombectomy (CAVT) system in acute ischemic stroke patients with emergent large vessel occlusion. The single-arm, prospective, multicenter trial enrolled 216 patients across 29 U.S. centers with core-lab adjudication.
THUNDER met its predefined performance goal, with 87.5% of cases achieving successful reperfusion (mTICI 2b-3). Post-THUNDERBOLT, 70.4% reached mTICI 2c-3, first-pass mTICI 2b-3 was 64.8%, median time-to-revascularization was 20 minutes, and complete clot ingestion was 83%. Device/procedure-related serious adverse events occurred in 2.8%, symptomatic intracranial hemorrhage in 0.9%, and 90-day all-cause mortality in 11.7%. Penumbra said THUNDERBOLT, the first and only CAVT device for stroke, has recently received U.S. FDA clearance and CE Mark.
Positive
- THUNDER met performance goal with 87.5% successful reperfusion (mTICI 2b-3)
- High-quality reperfusion with 70.4% achieving mTICI 2c-3 after THUNDERBOLT
- Efficient procedures with 64.8% first-pass mTICI 2b-3 and 20-minute median revascularization time
- Complete clot ingestion achieved in 83% of cases using THUNDERBOLT CAVT system
- Favorable safety profile metrics reported: 2.8% serious device/procedure-related events, 0.9% sICH, 11.7% 90-day mortality
- Regulatory milestones with recent U.S. FDA clearance and CE Mark for THUNDERBOLT
Negative
- None.
Key Figures
Historical Context
| Date | Event | Sentiment | 24h Move | Catalyst |
|---|---|---|---|---|
| Jul 07 | Study enrollment | Positive | +0.0% | First patient enrolled in FORWARD study evaluating CAVT for distal stroke |
| Jun 15 | CE Mark expansion | Positive | -0.2% | THUNDERBOLT received European CE Mark for acute ischemic stroke treatment |
| Jun 11 | FDA clearance | Positive | +0.1% | THUNDERBOLT received U.S. FDA clearance for acute ischemic stroke |
| May 06 | Quarterly earnings | Neutral | +0.1% | Revenue increased while net income and earnings per share declined year over year |
| Apr 13 | Clinical trial results | Positive | +0.5% | STORM-PE reported improved functional outcomes with CAVT plus anticoagulation |
24h Move is the share-price change in the day after each event; other market factors may also have contributed.
Recent clinical and regulatory announcements produced mixed but generally small 24-hour reactions, including both positive and negative moves.
Key Terms
investigational device exemption regulatory
AI-generated analysis. How Rhea-AI works. Not financial advice.
First and only CAVT device for stroke demonstrated high revascularization rates, short procedure times and low complication rates
"Mechanical thrombectomy is considered frontline treatment for stroke; however, current technologies may not fatigue and completely ingest the clot quickly or effectively at the site of the occlusion," said Donald Frei, M.D., co-principal investigator of THUNDER and neurointerventional radiologist at Swedish Medical Center,
THUNDER met its predefined performance goal, with
- First-pass mTICI 2b-3 was
64.8% . - Median time-to-revascularization was 20 min.
- Complete clot ingestion rate was
83% , demonstrating that the THUNDERBOLT system reliably facilitates the removal of clot. - Device/procedure-related serious adverse events occurred in
2.8% , sICH in0.9% , and the rate of all-cause mortality at 90 days was11.7% , which is comparatively low to other thrombectomy therapies.
"In the THUNDER study, we observed that modulated aspiration facilitated consistent and complete clot removal when used in conjunction with standard-sized aspiration thrombectomy catheters," said David Fiorella, M.D., Ph.D., co-principal investigator of THUNDER and director of the Cerebrovascular Center at Stony Brook University Hospital,
THUNDER is a single-arm, prospective, multicenter study with core-lab adjudication to evaluate the safety and effectiveness of THUNDERBOLT, which features Penumbra's CAVT technology, in stroke patients with ELVO. The study enrolled 216 patients across 29 U.S. centers.
"The THUNDER study provides robust clinical evidence supporting the safety and effectiveness of THUNDERBOLT for revascularization in ELVO stroke," said James F. Benenati, M.D., FSIR, chief medical officer at Penumbra. "These findings reinforce modulated aspiration as a significant advancement in mechanical thrombectomy and suggest it could expand physicians' treatment options to achieve rapid, effective revascularization in stroke, which is critical for patient outcomes."
Acute ischemic stroke (AIS) remains a major global health challenge, accounting for approximately
THUNDERBOLT recently received
About Penumbra
Penumbra, Inc., the world's leading thrombectomy company, is focused on developing the most innovative technologies for challenging medical conditions such as ischemic stroke, venous thromboembolism such as pulmonary embolism, and acute limb ischemia. Our broad portfolio, which includes computer assisted vacuum thrombectomy (CAVT), centers on removing blood clots from head-to-toe with speed, safety and simplicity. By pioneering these innovations, we support healthcare providers, hospitals and clinics in more than 100 countries, working to improve patient outcomes and quality of life. For more information, visit www.penumbrainc.com and connect on Instagram, LinkedIn and X.
Important Safety Information
Additional information about Penumbra's products can be located on Penumbra's website at https://www.penumbrainc.com/providers. Caution: Federal (USA) law restricts these devices to sale by or on the order of a physician. Prior to use, please refer to the Instructions for Use (IFU) for complete product indications, contraindications, warnings, precautions, potential adverse events, and detailed instructions for use. Please visit www.peninc.info/risk for the complete IFU Summary Statements.
Forward-Looking Statements
Except for historical information, certain statements in this press release are forward-looking in nature and are subject to risks, uncertainties and assumptions about us. Our business and operations are subject to a variety of risks and uncertainties and, consequently, actual results may differ materially from those projected by any forward-looking statements. Factors that could cause actual results to differ from those projected include, but are not limited to: the risk that the pending acquisition by Boston Scientific Corporation will not be completed in the expected timeframe or at all, including the risk that required regulatory approvals will not be obtained; potential adverse effects to our business during the pendency of the acquisition, such as employee departures or diversion of management's attention from our business; failure to sustain or grow profitability or generate positive cash flows; failure to effectively introduce and market new products; delays in product introductions; significant competition; inability to further penetrate our current customer base, expand our user base and increase the frequency of use of our products by our customers; inability to achieve or maintain satisfactory pricing and margins; manufacturing difficulties; permanent write-downs or write-offs of our inventory or other assets; product defects or failures; unfavorable outcomes in clinical trials; inability to maintain our culture as we grow; fluctuations in foreign currency exchange rates; potential adverse regulatory actions; and the potential impact of any acquisitions, mergers, dispositions, joint ventures or investments we may make. These risks and uncertainties, as well as others, are discussed in greater detail in our filings with the Securities and Exchange Commission, including our Annual Report on Form 10-K for the year ended December 31, 2025, which we filed on February 25, 2026. There may be additional risks of which we are not presently aware or that we currently believe are immaterial which could have an adverse impact on our business. Any forward-looking statements are based on our current expectations, estimates and assumptions regarding future events and are applicable only as of the dates of such statements. We make no commitment to revise or update any forward-looking statements in order to reflect events or circumstances that may change.
Contact | |
Jennifer Heth | Parinaz Farzin |
Penumbra, Inc. | Merryman Communications |
510-995-9791 | 310.600.6746 |
i Tsao CW, Aday AW, Almarzooq ZI, et al. Heart Disease and Stroke Statistics-2023 Update: A Report From the American Heart Association. Circulation. Feb 21 2023;147(8):e93-e621. doi:10.1161/cir.0000000000001123
ii Rennert RC, Wali AR, Steinberg JA, et al. Epidemiology, Natural History, and Clinical Presentation of Large Vessel Ischemic Stroke. Neurosurgery. Jul 1 2019;85(suppl_1):S4-s8. doi:10.1093/neuros/nyz042
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SOURCE Penumbra, Inc.