Directional Antenna Wireless Telemetry in Cardiac Devices
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Solution Overview
Problem
Implantable cardiac devices face challenges with mechanical complications and MRI compatibility issues due to elongate lead wires, and there is a need for compact devices with efficient power management within limited space for wireless communications.
Innovation Solution
A compact cardiac medical device with a directional antenna that activates transmitter elements only during periods of reduced ventricular wall motion, using electrodes or mechanical transducers to detect these periods, and optionally applies pacing pulses to create stable communication conditions, thereby optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication is continuously active to ensure stable telemetry, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The transmitter elements are activated only during specific periods when ventricular wall motion is reduced, rather than continuously. This periodic activation during favorable motion phases maintains communication reliability while significantly reducing overall power consumption.
Solution Approach 2:
The communication system dynamically adjusts its operation based on real-time detection of ventricular wall motion phases. The system transitions between active and inactive states according to the mechanical environment, optimizing the balance between signal stability and power usage.
2Productivity
If transmitter elements are activated during high ventricular wall motion to ensure continuous communication, then communication coverage is improved, but signal stability deteriorates
Solution Approach 1:
The system performs preliminary detection of ventricular wall motion phases using electrodes or mechanical transducers before activating the transmitter. This advance detection allows the system to wait for optimal conditions (reduced wall motion) before initiating communication, ensuring signal stability.
Solution Approach 2:
The system continuously monitors ventricular wall motion and uses this feedback to control transmitter activation. The detection system provides real-time information about wall motion phases, enabling the communication system to adapt its operation to maintain signal stability.
3Reliability
If the device is made compact to eliminate lead wires and reduce mechanical complications, then device safety is improved, but space for power supply and circuitry is reduced
Solution Approach 1:
By activating the transmitter only during specific periods when ventricular wall motion is reduced, the system reduces the power requirements for wireless communication. This allows for a smaller power supply and more compact overall device design while maintaining adequate communication capability.
Solution Approach 2:
The system changes its operational parameters based on the mechanical environment, specifically activating communication during phases of reduced ventricular wall motion. This parameter adjustment allows for reduced power consumption and smaller component sizes.
Data Source
AI summary
A relatively compact implantable cardiac medical device includes a wireless communications module, which employs a directional antenna and which is adapted to receive input concerning ventricular wall motion. When the cardiac medical device is anchored to a ventricular wall, transmitter elements of the communications modules are only activated for communication during a detected period of reduced ventricular wall motion. The period of reduced ventricular wall motion may be defined as at least one time interval during which an axis of the directional antenna does not rotate out from a baseline orientation by more than 15 degrees. The communication may be conducted with an external programmer-type device, or with another implanted device, for example, located remote from the heart.