System Architecture

AyushBridge follows a microservices architecture designed for scalability, security, and compliance with India's EHR standards and FHIR R4 specifications.

Overview

The system is built around a core terminology service that bridges multiple healthcare coding systems, with dedicated modules for authentication, data synchronization, and audit compliance.

┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   EMR Frontend  │────│  API Gateway     │────│ Terminology     │
│   (Clinical UI) │    │  (OAuth 2.0)     │    │ Microservice    │
│   - Auto-complete│    │  - Rate Limiting │    │ - FHIR Resources│
│   - Dual Coding │    │  - Authentication│    │ - Code Mapping  │
└─────────────────┘    └──────────────────┘    └─────────────────┘
                                                      │
┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   ABHA Identity │────│  Authentication  │    │ FHIR Resources  │
│   Provider      │    │  Service         │    │ & Storage       │
│   - Health ID   │    │  - JWT Tokens    │    │ - CodeSystems   │
│   - OAuth 2.0   │    │  - Role-based    │    │ - ConceptMaps   │
└─────────────────┘    └──────────────────┘    └─────────────────┘
                                                      │
┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│ WHO ICD-11 API  │────│ External API     │    │ Database Layer  │
│ (TM2 & Bio)     │    │ Sync Service     │    │ & Cache         │
│ - Real-time sync│    │ - Version control│    │ - MongoDB/SQL   │
│ - Updates       │    │ - Error handling │    │ - Redis Cache   │
└─────────────────┘    └──────────────────┘    └─────────────────┘

Core Components

API Gateway

• Rate Limiting: Prevents abuse and ensures fair usage
• Authentication: ABHA OAuth 2.0 integration
• Request Routing: Intelligent routing to backend services
• Monitoring: Real-time performance metrics

Terminology Service

• FHIR R4 Compliance: Full implementation of terminology resources
• Code Translation: Bidirectional mapping between systems
• Search Engine: Elasticsearch-powered terminology lookup
• Validation: FHIR resource validation and conformance

Authentication Service

• ABHA Integration: India's health ID provider integration
• JWT Management: Token generation and validation
• Role-Based Access: Granular permission system
• Session Management: Secure session handling

Data Synchronization

• WHO ICD-11 Sync: Real-time updates from official API
• Version Control: Terminology version management
• Conflict Resolution: Automated merge strategies
• Error Handling: Robust error recovery mechanisms

Data Flow

Search Request Flow

1. Client Request: EMR system sends search query
2. Authentication: ABHA token validation
3. Query Processing: Natural language processing
4. Database Query: Elasticsearch terminology search
5. Result Assembly: FHIR-compliant response
6. Response Delivery: Structured terminology results

Code Translation Flow

1. Translation Request: Source code with target system
2. Lookup: Source code validation and lookup
3. Mapping Engine: ConceptMap resource evaluation
4. Confidence Scoring: Quality assessment
5. Response: Target codes with confidence metrics

Data Synchronization Flow

1. Schedule Trigger: Automated or manual sync initiation
2. API Authentication: WHO ICD-11 API credentials
3. Delta Retrieval: Incremental updates only
4. Validation: Data integrity checks
5. Database Update: Atomic transaction processing
6. Audit Logging: Complete operation trail

Security Architecture

Authentication & Authorization

• OAuth 2.0: ABHA provider integration
• JWT Tokens: Stateless authentication
• Role-Based Access Control: Granular permissions
• API Key Management: Service-to-service authentication

Data Protection

• Encryption at Rest: AES-256 database encryption
• Encryption in Transit: TLS 1.3 for all communications
• Data Masking: Sensitive data protection
• Audit Trails: Comprehensive logging for compliance

Network Security

• API Gateway: Centralized security enforcement
• Rate Limiting: DDoS protection
• IP Whitelisting: Restricted access controls
• VPN/Private Networks: Secure connectivity options

Deployment Options

Container Deployment

# docker-compose.yml
version: '3.8'
services:
  api-gateway:
    image: ayushbridge/api-gateway:latest
    ports:
      - "443:443"
    environment:
      - ABHA_CLIENT_ID=${ABHA_CLIENT_ID}
      - JWT_SECRET=${JWT_SECRET}
  
  terminology-service:
    image: ayushbridge/terminology:latest
    depends_on:
      - mongodb
      - redis
    environment:
      - DB_URI=mongodb://mongodb:27017/ayushbridge
      - REDIS_URI=redis://redis:6379
  
  mongodb:
    image: mongo:5.0
    volumes:
      - mongodb_data:/data/db
  
  redis:
    image: redis:6.0
    volumes:
      - redis_data:/data

Kubernetes Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ayushbridge-api
spec:
  replicas: 3
  selector:
    matchLabels:
      app: ayushbridge-api
  template:
    metadata:
      labels:
        app: ayushbridge-api
    spec:
      containers:
      - name: api
        image: ayushbridge/api:latest
        ports:
        - containerPort: 3000
        env:
        - name: DB_URI
          valueFrom:
            secretKeyRef:
              name: ayushbridge-secrets
              key: db-uri
        - name: ABHA_CLIENT_SECRET
          valueFrom:
            secretKeyRef:
              name: ayushbridge-secrets
              key: abha-client-secret

Cloud Deployment

• AWS: ECS/EKS with RDS and ElastiCache
• Azure: Container Instances with Cosmos DB
• Google Cloud: GKE with Cloud SQL and Memorystore
• On-Premises: Docker Swarm or Kubernetes