Leadless Pacing Device Mode Switching for Loss of Conduction
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Solution Overview
Problem
Conventional cardiac pacing systems with leads can cause complications and are not suitable for all patients, particularly those with intermittent AV node conduction or irregular heart rates, as they require leads that may not always accurately sense atrial and ventricular activity, leading to suboptimal pacing modes.
Innovation Solution
A leadless pacing device (LPD) configured for implantation in the ventricle, capable of switching between sensing without pacing, atrio-ventricular synchronous, and asynchronous ventricular pacing modes based on detected atrial oversensing and loss of conduction, using a processing module to determine the appropriate pacing mode and timing of pacing pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cardiac pacing systems with leads are used, then pacing function is provided, but complications and inaccuracies in sensing atrial and ventricular activity occur
Solution Approach 1:
The patent removes the external leads from the pacing system, extracting the harmful element (leads that cause complications and sensing inaccuracies) while retaining the essential pacing function through a leadless device implanted directly in the ventricle
Solution Approach 2:
The patent combines the pacing and sensing functions into a single integrated leadless device, merging the pulse generator and sensing electrodes into one unit that is implanted directly in the ventricle, eliminating the need for separate leads
2Adaptability or versatility
If leadless pacing device switches pacing modes frequently, then adaptability to cardiac conditions is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic mode switching capability that allows the device to automatically transition between different pacing modes (AV synchronous, asynchronous, sensing without pacing) based on real-time detection of atrial oversensing and loss of conduction, making the system adaptable to changing cardiac conditions
Solution Approach 2:
The patent uses feedback from the detection of atrial oversensing and loss of conduction events to automatically adjust the pacing mode, creating a closed-loop control system that responds to actual cardiac electrical activity and selects appropriate pacing modes accordingly
Data Source
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AI summary
In some examples, a leadless pacing device (LPD) is configured to switch from a sensing without pacing mode to ventricular pacing mode in response to determining that no intrinsic ventricular activity was detected within a ventricular event detection window for at least one cardiac cycle, which may be referred to as loss of conduction. The ventricular pacing mode may be selected based on whether atrial oversensing is detected in combination with the loss of conduction. In some examples, an atrio-ventricular synchronous pacing mode is selected in response to detecting loss of conduction and in response to determining that atrial oversensing is not detected. In addition, in some examples, an asynchronous ventricular pacing mode is selected in response to detecting both atrial oversensing and loss of conduction.