In this study, we employ a systematic approach to improve PLLA's piezoelectric properties and study it under a variety of mechanical stimuli, including cyclic strain, tapping, and bending while measuring the force-and frequency-sweep conditions. This comprehensive characterization provides critical insights into the relationship between processing conditions and material performance, paving the way for practical applications. In addition to this, we evaluate its potential for strain sensing in cardiovascular applications. A key focus is the development of a ring-like PLLA-based strain sensor for real-time monitoring of dynamic mechanical forces during aortic annuloplasty. The fabricated sensor was tested in an in vitro setup simulating physiological pressures, demonstrating a clear correlation between applied pressures and voltage outputs. These findings provide a foundation for integrating biodegradable piezoelectric sensors into cardiovascular surgeries, addressing the growing need for realtime biomechanical feedback while advancing the field of bioelectronics.