Abstract
Treating congestive heart failure by injecting potential cardio-reparative cells, such as mesenchymal stem cells (MSCs), into the myocardium via a needle-tipped catheter is a novel approach that may improve clinical outcomes. While clinical trials vary on cell type, dose, and rate of injection, a typical intramyocardial procedure involves hand injecting 10–16 sequential cell aliquots of up to 0.5 mL volume per aliquot over 30–60 s via a 25 G × 110 cm long injection needle. Unfortunately, manual hand injections can result in unpredictable flow rates and hand fatigue, causing inconsistent cell delivery and thus treatment results. Automating the cell delivery with controlled injection rates that are optimized to ensure cell viability upon exiting the catheter can enhance local cell retention and ultimately therapeutic efficacy. In response to this need, we designed a novel, automated programmable injection device that integrates with for-human-use syringes and transcatheter intramyocardial injection catheters, provides controlled injection rates, and displays injection forces and pressures applied to the injectate in real time. Using MSCs, bovine skeletal muscle of varying stiffness, and ex vivo porcine heart for intramyocardial injection testing, we confirmed that the device prototype reliably delivers 0.5 mL aliquots in 30- and 60-s intervals, accurately and reproducibly, measures force and pressure with real-time feedback, and preserves cell viability without clumping and obstructing the catheter. The novel, automated programmable cell injection device and testing framework we developed has the potential to improve the success of transcatheter intramyocardial delivery for heart repair.
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Acknowledgements
The authors would like to acknowledge Dr. Aviad Hai for all of his guidance and assistance with the design process. The authors would also like to thank the Biomedical Engineering Design staff at the University of Wisconsin-Madison for this opportunity. This work was supported by a Wisconsin State Economic Engagement and Development (SEED) Research Program Grant.
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ANR is a consultant for Novo Nordisk and Blue Rock Therapeutics. He is a founder with equity share of Cellular Logistics. He receives clinical trial research support from BioCardia Inc. EGS is a founder with equity share from Cellular Logistics.
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Esswein, P.J., Frank, M.C., Obrycki, V.J. et al. Design and Evaluation of a High-Precision Programmable Force-Sensing Therapeutic Intramyocardial Stem Cell Injection Device. Biomedical Materials & Devices (2024). https://doi.org/10.1007/s44174-024-00175-3
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DOI: https://doi.org/10.1007/s44174-024-00175-3