Secure Telemetry Link for Implantable Medical Devices

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Solution Overview

Problem

Current wireless communication protocols for implantable medical devices (IMDs) lack secure authentication and message integrity, making them vulnerable to eavesdropping and manipulation, especially as communication ranges increase, which can lead to suboptimal treatment outcomes and patient safety risks.

Innovation Solution

A secure telemetry system is implemented using encryption and multi-factor authentication, including smartcards and biometric tokens, to ensure message privacy, integrity, and freshness, with a proximity-dependent 'backdoor' for emergency access to prevent adverse health effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If wireless communication range is increased for IMD telemetry, then patient convenience and treatment effectiveness are improved, but vulnerability to eavesdropping and signal manipulation increases

Engineering Contradiction:

Improvecommunication rangeVSAvoideavesdropping and signal manipulation risk

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The system applies preliminary anti-action by implementing encryption and authentication protocols before communication occurs. The encryption scheme prevents eavesdropping by encoding messages, while authentication protocols verify the legitimacy of transmitting devices, thereby counteracting potential harmful effects of increased communication range.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent introduces an intermediary authentication mechanism that mediates between the IMD and external devices. This intermediary layer verifies device legitimacy through authentication protocols and ensures message integrity, thereby protecting against unauthorized access and manipulation while allowing extended communication range.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If encryption and multi-factor authentication are implemented, then message privacy and integrity are improved, but device complexity increases

Engineering Contradiction:

Improvemessage privacy and integrityVSAvoidauthentication system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The authentication system is segmented into multiple independent factors (something the patient has, something the patient knows, something the patient is). This segmentation allows each factor to be implemented and verified separately, managing complexity while providing comprehensive security through multi-factor authentication.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a universal authentication framework that can accommodate multiple authentication factors and types. This multi-functional system handles various authentication methods (smartcards, biometric tokens, passwords) through a unified protocol, reducing overall system complexity despite the diverse authentication capabilities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If strong authentication protocols are used, then security against unauthorized access is improved, but ease of operation decreases

Engineering Contradiction:

Improvesecurity against unauthorized accessVSAvoidauthentication process convenience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The authentication system dynamically adapts its requirements based on the situation. The system can adjust the number and type of authentication factors required, balancing security needs with operational convenience. This dynamic approach allows strong authentication when necessary while maintaining ease of operation in routine scenarios.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements self-service authentication mechanisms where patients can independently complete authentication processes using their own devices (smartcards, biometric tokens). This self-service approach reduces the need for manual intervention and simplifies the user experience while maintaining strong security protocols.

Inventive Principle:

Principle #25Self-service

4Reliability

If proximity-dependent backdoor is implemented for emergency access, then patient safety in emergencies is improved, but security vulnerability increases

Engineering Contradiction:

Improveemergency access capabilityVSAvoidsecurity vulnerability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The backdoor access mechanism uses local quality by requiring physical proximity to the IMD as a prerequisite for emergency access. This proximity requirement creates a localized security zone where only devices physically near the implant can initiate backdoor access, thereby limiting the scope of potential security vulnerabilities while enabling emergency救治.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system performs preliminary action by establishing proximity verification before allowing backdoor access. This preliminary check ensures that only authorized devices in physical proximity to the IMD can bypass normal authentication, preventing remote exploitation of the backdoor while maintaining emergency access capability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8190900B2Secure telemetric link

Publication Date: 2012.05.29 MEDTRONIC INC

AI summary

A communications protocol is used to provide data privacy, message integrity, message freshness, and user authentication to telemetric traffic, such as to and from implantable medical devices in a body area network. In certain embodiments, encryption, message integrity, and message freshness are provided through use of token-like nonces and ephemeral session-keys derived from device identification numbers and pseudorandom numbers.