Chemical Engines and Methods for Injecting Highly Viscous Fluids - Eli Lilly EP4252801A2
Summary
The European Patent Office published patent application EP4252801A2 for Eli Lilly and Company, titled 'Chemical Engines and Methods for Their Use, Especially in the Injection of Highly Viscous Fluids.' The patent covers injection devices designed to deliver highly viscous pharmaceutical fluids, classified under A61M (medical injectors). The patent designates all EU member states and EPO contracting states.
What changed
EPO published patent application EP4252801A2, filed by Eli Lilly and Company, covering chemical engine mechanisms and methods for injecting highly viscous fluids. The invention is classified under IPC A61M 5/20, 5/19, 5/148, 5/28, and 5/142, reflecting devices for subcutaneous and intramuscular injection of high-viscosity formulations such as concentrated biologics and peptide therapeutics.
Competitors developing dual-chamber syringes, high-pressure injectors, or viscous drug delivery systems should review Eli Lilly's claim scope for potential infringement risks. Freedom-to-operate analyses for injectable device pipelines may require design-around strategies to avoid the claimed mechanisms.
Archived snapshot
Apr 17, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
CHEMICAL ENGINES AND METHODS FOR THEIR USE, ESPECIALLY IN THE INJECTION OF HIGHLY VISCOUS FLUIDS
Publication EP4252801A2 Kind: A2 Apr 08, 2026
Applicants
Eli Lilly and Company
Inventors
HEINTZ, Amy M., BENNISON, Corrie, MUENZER, Christopher H., BLUM, Timothy M., MCKENZIE, Christopher P., MADLAND, Steven M., ELLIS, Jeffrey L., KASEMAN, Brian
IPC Classifications
A61M 5/20 20060101AFI20260304BHEP A61M 5/19 20060101ALI20260304BHEP A61M 5/148 20060101ALN20260304BHEP A61M 5/28 20060101ALN20260304BHEP A61M 5/142 20060101ALN20260304BHEP
Designated States
AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LI, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR
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