April 22, 2026 FDA Warning Letter: Estar Technologies Ltd Cited for Investigational Device Exemptions (IDE)/Premarket Approval Application (PMA) Adulterated Device

FDA Warning Letter — Violations FDA cited at Estar Technologies Ltd

WARNING LETTER Estar Technologies Ltd MARCS-CMS 716831 — April 22, 2026 More Warning Letters Warning Letters About Warning and Close-Out Letters Delivery Method: Via UPS and EMAIL Reference #: CBER 26-716831 Product: Biologics Medical Devices Recipient: Recipient Name Aaron Esteron Recipient Title Chief Executive Officer and Founder Estar Technologies Ltd 15, Ha-Merkava Holon 5885111 Israel Aaron@estar-medical.com Issuing Office: Center for Biologics Evaluation and Research United States WARNING LETTER April 22, 2026 CBER 26-716831 Dear Mr. Esteron: The United States Food and Drug Administration (FDA) has learned that your firm is offering for sale the Tropocells® PRP kit, Tropocells® PRF kit, Tropocells® TRS kit, Tropocells® PRFM kit, TropoVisc™ kit, Tropokine™ kit, and Cellenis® PRP kit (hereafter, “your devices”) in the United States without marketing clearance or approval, in violation of the Federal Food, Drug, and Cosmetic Act (the Act). Under section 201(h) of the Act, 21 U.S.C. § 321(h), your devices are intended for use in the diagnosis of disease or other conditions or in the cure, mitigation, treatment, or prevention of disease, or are intended to affect the structure or any function of the body. Based on information and records reviewed by FDA, including your websites at https://www.tropocells.com and https://estar-medical.com/ (last visited April 2026), your devices are adulterated under section 501(f)(1)(B) of the Act, 21 U.S.C. § 351(f)(1)(B), because your firm does not have approved applications for premarket approval (PMA) in effect pursuant to section 515(a) of the Act, 21 U.S.C. § 360e(a), or approved applications for an investigational device exemption (IDE) under section 520(g) of the Act, 21 U.S.C. § 360j(g). Your introduction or delivery for introduction of your devices into interstate commerce, or the causing thereof is a prohibited act under section 301(a) of the Act, 21 U.S.C. § 331(a). Your devices are also misbranded under section 502(o) of the Act, 21 U.S.C. § 352(o), because your firm did not notify the agency of its intent to introduce your devices into commercial distribution, as required by section 510(k) of the Act, 21 U.S.C. § 360(k), and 21 CFR 807.81(a). Of note, the TropoCells® PRP kit was cleared under premarket notification (510(k)) submission number BK110035 with the following indication, “safe and rapid preparation of autologous platelet-rich plasma (PRP) from a small sample of blood at the patient point of care. The PRP is mixed with autograft and/or allograft bone prior to application to a bony defect for improving handling characteristics.” However, you include statements such as the following on your website, https://www.tropocells.com, regarding the uses of the Tropocells® PRP kit: “Tropocells® PRP is the ideal autologous technology for the healing of: musculoskeletal injuries, joint and osteoarthritis treatment, sports injuries, wound healing, ophthalmology, dentistry and oral surgery, and post-surgical recovery.” These represent major changes or modifications to the intended uses for this device and are changes or modifications that could significantly affect its safety or effectiveness. Therefore, premarket notification for this device is required. See 21 CFR 807.81(a)(3). For a device requiring premarket approval, the notification required by section 510(k) is deemed satisfied when a PMA is pending before the FDA. 21 C.F.R. § 807.81(b). The kind of information that you need to submit in order to obtain approval or clearance for your devices is described on the Internet at http://www.fda.gov/MedicalDevices/DeviceRegulationandGuidance/HowtoMarketYourDevice/default.htm. FDA will evaluate the information that your firm submits and decide whether the products may be legally marketed. Conclusion Estar Technologies Ltd. should cease any activities that result in the misbranding or adulteration of the Tropocells® PRP kit, Tropocells® PRF kit, Tropocells® TRS kit, Tropocells® PRFM kit,