Implantable Pressure Sensor with Fluid Cavity for Cardiac Monitoring
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Solution Overview
Problem
Implantable medical devices, such as leadless cardiac pacemakers, face challenges in accurately monitoring cardiac activity and delivering therapy due to limitations in sensing pressure and cardiac cycle phases, which can affect the effectiveness of treatments for heart conditions like arrhythmias and inefficient heart contractions.
Innovation Solution
Incorporating a pressure sensor with a diaphragm responsive to external pressure, coupled with circuitry that communicates pressure measurements and cardiac signals to determine cardiac cycle phases, allowing for precise monitoring and therapy delivery, including cardiac resynchronization therapy (CRT) optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is integrated into the implantable medical device housing, then measurement precision of cardiac pressure is improved, but device complexity increases
Solution Approach 1:
The pressure sensor is integrated directly into the housing structure of the implantable medical device, combining the housing and sensor into a single unified component. This eliminates the need for separate sensor housings and reduces overall device complexity while maintaining measurement precision.
Solution Approach 2:
The housing serves multiple functions: it provides structural protection for internal components and simultaneously acts as the pressure sensing element through the integrated pressure sensor. This multi-functionality reduces the number of separate components needed, thereby reducing device complexity.
2Measurement precision
If a diaphragm is added to transmit pressure from external environment to the pressure sensor, then measurement precision is improved, but device complexity increases
Solution Approach 1:
A diaphragm made of flexible material is used to transmit pressure from the external environment to the pressure sensor. The diaphragm's flexibility allows it to deform in response to pressure changes while maintaining a simple, thin-film structure that does not significantly increase device complexity.
Solution Approach 2:
The diaphragm acts as an intermediary element between the external environment and the pressure sensor, enabling accurate pressure transmission while isolating the sensor from direct exposure to the external environment. This simple intermediary structure resolves the contradiction by providing necessary pressure coupling without adding complex mechanisms.
3Measurement precision
If fluid-filled cavity is used to communicate pressure measurements, then measurement precision is improved, but device complexity increases
Solution Approach 1:
A fluid-filled cavity is used to transmit pressure measurements from the diaphragm to the pressure sensor. The fluid acts as a hydraulic medium, efficiently transmitting pressure signals with high fidelity. This approach maintains measurement precision while using a simple fluid-filled space rather than complex mechanical transmission mechanisms.
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
Enhances the ability to monitor cardiac activity and deliver targeted therapies, improving heart function and reducing arrhythmias by accurately sensing pressure and cardiac cycle phases, thereby optimizing treatment outcomes.
Implementation Method 1
The diaphragm may be responsive to a pressure applied to the diaphragm by the environment outside of the housing
Implementation Method 2
A pressure sensor may be within the housing may have a pressure sensor diaphragm that is responsive to a pressure applied to the pressure sensor diaphragm and provides a pressure sensor output signal that is representative of the pressure applied to the pressure sensor diaphragm
Implementation Method 3
A fluid filled cavity may be in fluid communication with both the diaphragm of the housing and the pressure sensor diaphragm of the pressure sensor. The fluid filled cavity may be configured to communicate a measure related to the pressure applied by the environment to the diaphragm of the housing to the pressure sensor diaphragm of the pressure sensor
Data Source
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AI summary
An implantable medical device (IMD) is configured with a pressure sensor. The IMD includes a housing, a pressure sensor and a fluid filled cavity. The housing has a diaphragm that is exposed to the environment outside of the housing. The pressure sensor has a pressure sensor diaphragm that is responsive to a pressure applied to the pressure sensor diaphragm and provides a pressure sensor output signal that is representative of the pressure applied to the pressure sensor diaphragm. The fluid filled cavity is in fluid communication with both the diaphragm of the housing and the pressure sensor diaphragm of the pressure sensor. The fluid filled cavity is configured to communicate a measure related to the pressure applied by the environment to the diaphragm of the housing to the pressure sensor diaphragm of the pressure sensor.