PPSEHR: A Differential Privacy and LLM-Driven Synthetic Medical Record Generation System

PPSEHR is an enterprise-level privacy-preserving synthetic electronic health record (EHR) generator that combines large language models (LLMs) with differential privacy algorithms. It provides high-quality data for medical AI research while protecting patient privacy. This article analyzes its technical architecture, privacy mechanisms, and application prospects, aiming to balance the privacy protection of medical data and the data needs of AI research and development.

Medical data is a valuable resource for AI training, but the protection of sensitive information is strict. Traditional desensitization methods struggle to balance privacy and utility—over-desensitization reduces data value, while insufficient desensitization risks leakage. Synthetic data technology solves this dilemma by generating artificial data with similar statistical characteristics. PPSEHR combines LLM generation capabilities with differential privacy to build a practical and secure synthetic medical data platform.

PPSEHR uses the Streamlit front-end framework to achieve user-friendly interaction; the back-end integrates LLM and differential privacy modules: LLM is responsible for understanding and generating medical text, while differential privacy provides mathematical privacy guarantees by adding calibrated noise (privacy budget controls the noise intensity). The system is designed for enterprise-level use, supporting large-scale data, modular maintenance, and lowering the threshold for non-technical users to use it.

Synthetic data can be used in scenarios such as medical AI model development (accelerating research and development, especially in rare disease fields), education and training (diversified case teaching), cross-institutional data sharing (avoiding privacy regulation restrictions), and software testing (reducing compliance costs), providing safe and efficient data support for the medical field.

Technical challenges include ensuring the statistical similarity of synthetic data, balancing privacy and utility, handling the diversity and complexity of medical data, and establishing multi-dimensional evaluation indicators. Compliance requires adherence to regulations such as GDPR and HIPAA; ethically, it is necessary to clarify data sources and usage methods, and identify the nature of synthetic data to avoid misuse.

PPSEHR builds a bridge between privacy protection and medical research, providing a safe data path for medical AI. Future directions include multi-modal synthesis (imaging, pathological slices), integration with federated learning, and enhancing interpretability and controllability. As technology matures and regulations improve, synthetic medical data will play a more important role in the medical ecosystem.