Leadless Pacemaker Dual-Gain Signal Processing
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Solution Overview
Problem
Current leadless cardiac pacemakers lack the capability to reliably sense atrial events for ventricular pacing with atrioventricular synchrony, as mechanical signals from atrial contractions are difficult to detect due to small signal volumes and interference from external factors.
Innovation Solution
A leadless pacemaker device with a processing circuitry that utilizes multiple electrodes to differentiate between near-field and far-field signals, employing separate processing channels with varying gains to enhance the detection of atrial activity, allowing for accurate timing of pacing stimuli based on atrial events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical sensors (pressure, motion, sound) are used to detect atrial contractions, then the pacemaker can sense atrial events, but the signal volume is too small and external factors interfere with reliable detection
Solution Approach 1:
The patent replaces mechanical sensing modalities (pressure, motion, sound sensors) with electrical sensing using electrodes. The electrode arrangement detects atrial electrical signals directly, substituting the mechanical detection system with an electrical one that is not susceptible to interference from external mechanical or acoustic factors.
Solution Approach 2:
The patent divides the signal processing into separate channels: a first processing channel for near-field ventricular signals and a second processing channel for far-field atrial signals. Each channel has optimized gain settings and processing parameters, allowing independent optimization for detecting specific cardiac chamber signals without interference from other chambers or external factors.
2Device complexity
If a single processing channel is used for all signals, then the device complexity is reduced, but the ability to differentiate between near-field and far-field signals is compromised
Solution Approach 1:
The processing circuitry is segmented into multiple independent processing channels, each dedicated to processing signals from specific cardiac chambers. The first processing channel handles near-field ventricular signals with appropriate gain, while the second processing channel handles far-field atrial signals with optimized gain, enabling clear differentiation between signal sources.
Solution Approach 2:
Each processing channel is configured with local optimization parameters including specific gain settings and processing characteristics tailored to the signal source it handles. The first channel has parameters optimized for ventricular signals while the second channel has parameters optimized for atrial signals, allowing each to perform its specific function with high precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable ventricular pacing synchronized with atrial activity, improving hemodynamic benefits by maximizing ventricular preload, reducing AV valve regurgitation, and maintaining low mean atrial pressure, while minimizing interference from external factors.
Implementation Method 1
an electrode arrangement arranged on the housing and configured to receive electrical signals
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A leadless pacemaker device (1) configured to provide for an intra-cardiac pacing comprises a housing (10); an electrode arrangement arranged on the housing (10) and configured to receive electrical signals; and a processing circuitry (15) enclosed in the housing (10) and operatively connected to the electrode arrangement, wherein the processing circuitry (15) comprises a first processing channel (16) having a first gain (G1) for processing a first processing signal derived from electrical signals received via the electrode arrangement and a second processing channel (17) having a second gain (G2) for processing a second processing signal derived from electrical signals received via the electrode arrangement, the second gain (G2) being higher than the first gain (G1).