Leadless Pacemaker Temperature Sensor Integration
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Solution Overview
Problem
Existing leadless cardiac pacemakers rely on temperature sensors external to the heart, connected by leads, which is inefficient for adjusting stimulation rates based on central venous temperature, as they do not provide real-time temperature sensing within the heart.
Innovation Solution
A leadless cardiac pacemaker design incorporating a hermetic housing with a temperature sensor, such as a thermistor or semiconductor sensor, integrated into the housing or ASIC, allowing for intracardiac temperature sensing and adjustment of stimulation rates without external leads, utilizing a bonded thermal path for efficient heat conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is integrated into the leadless pacemaker housing, then temperature sensing accuracy and response time improve, but device complexity increases
Solution Approach 1:
The temperature sensor is integrated directly into the pacemaker housing structure, merging the sensing function with the existing device components. This eliminates the need for separate sensor assemblies and reduces overall system complexity while improving measurement accuracy through direct thermal coupling.
Solution Approach 2:
A thermal coupling substance or interface layer is introduced between the housing and temperature sensor to optimize heat transfer. This intermediary element enhances thermal conductivity while allowing the sensor to remain integrated within the housing structure, resolving the conflict between accuracy and complexity.
2Device complexity
If a leadless pacemaker design is used, then device simplicity and patient comfort improve, but temperature sensing capability deteriorates
Solution Approach 1:
The pacemaker housing serves multiple functions: it provides structural containment, electrical isolation, and thermal coupling for temperature sensing. By making the housing multi-functional, the device maintains its leadless simplicity while gaining accurate intracardiac temperature sensing capability without adding external components.
Solution Approach 2:
The pacemaker housing itself is designed to provide the thermal coupling necessary for temperature sensing, eliminating the need for separate sensing leads or external temperature monitoring systems. The housing structure serves its own temperature sensing needs through integrated thermal pathways.
3Measurement precision
If external leads are used for temperature sensing, then temperature measurement capability improves, but ease of operation and patient comfort deteriorate
Solution Approach 1:
The temperature sensing function is extracted from the external lead system and incorporated directly into the pacemaker body. This eliminates the need for separate temperature sensing leads, simplifying the overall device while maintaining accurate temperature measurement capability through the integrated sensor.
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 rapid and accurate temperature sensing within the heart, allowing for timely adjustments in stimulation rates to match physical activity or temperature changes, improving the pacemaker's responsiveness and effectiveness.
Implementation Method 1
utilizing a bonded thermal path for efficient heat conduction
Data Source
AI summary
A leadless cardiac pacemaker comprises a housing, a plurality of electrodes coupled to an outer surface of the housing, and a pulse delivery system hermetically contained within the housing and electrically coupled to the electrode plurality, the pulse delivery system configured for sourcing energy internal to the housing, generating and delivering electrical pulses to the electrode plurality. The pacemaker further comprises a temperature sensor hermetically contained within the housing and adapted to sense temperature information, wherein the pacemaker can control electrical pulse delivery at least partly based on the temperature information.