Hybrid AI Medical Q&A System: Triple Integration of Rule Engine, Semantic Search, and Large Language Model

The Medhealth_Final project proposes an innovative hybrid architecture integrating rule engine, FAISS semantic search, and LLM. It aims to address the dual challenges of accuracy and interpretability in medical AI, providing reliable and traceable solutions for medical Q&A. This architecture optimizes the processing flow via a dynamic routing mechanism, balancing efficiency and compliance, and represents a practical path for current medical AI implementation.

AI applications in the medical field need to meet high accuracy (incorrect advice has severe consequences) and interpretability (doctors and patients need to understand the basis). Pure rule-based systems are rigid, while pure LLM tends to generate "hallucinations". The hybrid architecture of Medhealth_Final offers a solution to this problem.

Medhealth_Final adopts a three-layer processing mechanism:

1. Rule Engine: For structured questions with standard guidelines (e.g., drug interactions, dosage calculations), it provides zero-hallucination reliable answers based on medical knowledge bases and clinical guidelines;
2. Semantic Search: Uses FAISS to build vector indexes, matching user questions with medical literature and clinical cases to handle open-domain knowledge queries;
3. LLM: Integrates results from the first two layers to generate natural and fluent answers, points out uncertainties, and recommends consulting professional doctors.

The key innovation of the architecture is the dynamic routing mechanism, which automatically selects or fuses processing layers based on query types, bringing three major advantages:

• Accuracy improvement: Each layer performs its own function (rule engine handles known issues, semantic search finds references, LLM conducts comprehensive reasoning);
• Enhanced interpretability: Answers can be traced back to rules or literature sources, meeting regulatory requirements;
• Efficiency optimization: Simple questions are quickly responded to via the rule engine, while complex questions use LLM to reduce costs.

The hybrid architecture applies to the following scenarios:

1. Online medical consultation platforms: Provide preliminary health guidance and mark confidence levels;
2. Clinical decision support systems: Assist doctors in retrieving literature and similar cases;
3. Medical education tools: Help students understand diagnosis and treatment thinking.

Medical AI implementation still faces challenges:

1. Data privacy: Medical data is sensitive and requires strict local processing;
2. Regulatory compliance: Approval standards vary greatly across countries;
3. Responsibility attribution: Decision-making issues when AI suggestions conflict with doctors' judgments.

Medhealth_Final demonstrates the concept of "combinatorial AI"—not blindly pursuing pure neural network solutions, but selecting technical components based on problem characteristics. This may be the best path for current medical AI implementation.