Leadless Cardiac Pacemaker Atrial Signal Summation for AV Synchrony
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Solution Overview
Problem
Existing leadless cardiac pacemakers face challenges in reliably detecting atrial activity signals, which are inherently small when received in the ventricle, making it difficult to achieve atrial tracking for ventricular pacing.
Innovation Solution
A leadless pacemaker device that combines signal portions from multiple heart cycles to enhance the detection of atrial events by summing and analyzing electrical and mechanical signals, using a processing circuitry to derive a combined signal portion, which helps distinguish atrial activity from noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leadless pacemaker is implanted in the ventricle to avoid lead-related risks, then patient safety is improved, but the ability to reliably detect atrial activity signals deteriorates
Solution Approach 1:
The patent combines multiple sensing modalities (accelerometer for mechanical motion, pressure sensor for pressure changes, and electrode for electrical signals) into a single leadless pacemaker device. By merging these different sensing approaches, the device can reliably detect atrial activity despite being implanted in the ventricle, as each modality compensates for the limitations of the others
Solution Approach 2:
The patent transitions from relying solely on electrical signal detection to incorporating mechanical dimension (accelerometer) and pressure dimension (pressure sensor) for atrial activity detection. This multi-dimensional sensing approach enables reliable atrial tracking even when the pacemaker is positioned in the ventricle, far from the atrium
2Ease of operation
If the pacemaker is placed far from the atrium in the ventricle, then leadless implantation is achieved, but the signal volume from atrial contractions deteriorates
Solution Approach 1:
The patent merges multiple sensing modalities (mechanical acceleration, pressure changes, and electrical signals) to detect atrial activity. By combining these different types of signals, the device accumulates sufficient information about atrial contractions even though each individual signal has low volume due to the distance from the atrium
Solution Approach 2:
The patent changes the detection parameters by using multiple physical quantities (acceleration, pressure, electrical potential) instead of relying on a single parameter. This allows the device to detect atrial activity with adequate signal strength despite the unfavorable positioning in the ventricle
3Adaptability or versatility
If mechanical events are used to detect atrial contractions, then non-electrical sensing is achieved, but the detection difficulty increases due to small signal volume
Solution Approach 1:
The patent combines mechanical sensing (accelerometer), pressure sensing, and electrical sensing into an integrated system. The mechanical events provide complementary information to electrical signals, and the combination of all three modalities overcomes the difficulty of detecting small mechanical signals alone
Solution Approach 2:
The patent uses signal processing algorithms as intermediaries to extract meaningful atrial activity information from the raw mechanical and pressure signals. These processing algorithms act as mediators that translate the small mechanical signal volumes into reliable detection of atrial contractions
Data Source
AI summary
A leadless pacemaker device configured to provide for an intra-cardiac pacing includes a processing circuitry configured to generate ventricular pacing signals for stimulating ventricular activity at a ventricular pacing rate and a sensor configuration configured to receive a sense signal over a multiplicity of heart cycles. The processing circuitry is configured to derive, from signal portions of the sense signal relating to the multiplicity of heart cycles, a combined signal portion and to analyze the combined signal portion for obtaining information relating to an atrial event. The processing circuitry is configured to sum a predefined number of signal portions relating to different heart cycles to obtain the combined signal portion. The leadless pacemaker device allows, in particular, for a reliable detection of signals relating to an atrial activity and the use of such signals for controlling a ventricular pacing rate for a ventricular pacing.