Percutaneous Pump Pressure Sensing Beyond the Impeller Housing
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Solution Overview
Problem
Percutaneous circulatory support devices with pressure sensors face issues such as damage during deployment and inaccurate pressure readings due to dynamic effects, necessitating improved designs.
Innovation Solution
The devices incorporate a pressure sensor positioned proximally relative to the housing, protected within a sensor housing with apertures to minimize damage and enhance accuracy, using optical or electrical sensors coupled to a catheter via a secure outer jacket and cable lumen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure sensor is positioned distally within the housing, then it can measure intravascular pressures for detecting device position changes and determining cardiac output, but it is vulnerable to damage during deployment and inaccurate readings due to dynamic pressure effects
Solution Approach 1:
The pressure sensor is extracted from the distal housing environment and repositioned to a proximal location on the catheter, removing it from the high-risk deployment zone and dynamic pressure effects while maintaining its measurement function through strategic relocation
Solution Approach 2:
A sensor housing with apertures serves as an intermediary structure that protects the pressure sensor during deployment while allowing it to sense pressures in the aorta, mediating between the need for protection and the need for accurate measurement
2Reliability
If the pressure sensor is protected within a sensor housing with apertures, then it is protected during deployment, but the housing structure adds complexity to the device
Solution Approach 1:
The sensor housing serves multiple functions simultaneously: it protects the pressure sensor during deployment, positions the sensor in the aorta for accurate pressure sensing, and provides structural support, thereby reducing overall device complexity through functional integration
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
This design reduces sensor damage and improves pressure measurement accuracy by positioning the sensor proximally, reducing dynamic pressure-related inaccuracies and enhancing the reliability of cardiac output evaluation.
Implementation Method 1
a pressure sensor coupled to the catheter and disposed proximally relative to the housing
Data Source
AI summary
A percutaneous circulatory support device includes a housing and an impeller disposed within the housing. The impeller is configured to rotate relative to the housing to cause blood to flow through the housing. A motor is operably coupled to the impeller, and the motor is configured to rotate the impeller relative to the housing. A catheter is coupled to the motor, and a pressure sensor is coupled to the catheter and disposed proximally relative to the housing.