{
  "title": "Cardiac Device Structure",
  "description": "Hierarchical structure of St. Jude Medical / Abbott cardiac device data from Merlin.net",
  "type": "object",
  "properties": {
    "deviceId": {"type": "string", "description": "Unique device identifier"},
    "deviceType": {"type": "string", "description": "Device type (ICD, CRT-D, Pacemaker, etc.)"},
    "model": {"type": "string", "description": "Device model name"},
    "serialNumber": {"type": "string", "description": "Device serial number"},
    "implantDate": {"type": "string", "description": "Implant date (YYYY-MM-DD)"},
    "patientId": {"type": "string", "description": "Patient identifier"},
    "clinicId": {"type": "string", "description": "Monitoring clinic identifier"},
    "remoteMonitoring": {
      "type": "object",
      "description": "Remote monitoring configuration",
      "properties": {
        "enabled": {"type": "boolean"},
        "transmitterModel": {"type": "string"},
        "lastTransmissionDate": {"type": "string"},
        "connectionType": {"type": "string"}
      }
    },
    "batteryStatus": {
      "type": "object",
      "properties": {
        "voltage": {"type": "number"},
        "estimatedReplacementDate": {"type": "string"},
        "status": {"type": "string"}
      }
    },
    "leadMeasurements": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "leadLocation": {"type": "string"},
          "impedance": {"type": "number"},
          "threshold": {"type": "number"},
          "sensing": {"type": "number"}
        }
      }
    },
    "alerts": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "alertId": {"type": "string"},
          "alertType": {"type": "string"},
          "severity": {"type": "string"},
          "detectedDate": {"type": "string"}
        }
      }
    }
  }
}