Capacitive Pressure Sensor for Implantable Medical Pump
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Solution Overview
Problem
Implantable medical pumps lack effective pressure sensing mechanisms to monitor fluid pressure within their reservoirs and delivery systems, which is crucial for accurate drug delivery and preventing complications such as blockages or unauthorized fluid removal.
Innovation Solution
A capacitive pressure sensor is integrated into the implantable medical pump, utilizing a biocompatible and non-corrosive design with a flexible diaphragm and rigid insulator to detect pressure changes, forming part of the fluid enclosure and providing self-alignment features for precise orientation within the pump's structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is integrated into the implantable medical pump, then pressure monitoring capability is improved, but device complexity increases
Solution Approach 1:
The pressure sensor is integrated into the existing pump structure by incorporating capacitive plates into the reservoir and delivery system walls, merging the pressure sensing function with the structural components rather than adding a separate sensing mechanism
Solution Approach 2:
The capacitive plates serve dual purposes: forming part of the fluid enclosure structure and simultaneously acting as sensing elements for pressure detection, allowing one component to perform multiple functions
2Reliability
If biocompatible and non-corrosive materials are used for the pressure sensor, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The same biocompatible and non-corrosive material is used for both the housing and diaphragm components of the pressure sensor, ensuring uniform material properties throughout the device that resist corrosion and are biocompatible, while simplifying manufacturing through material consistency
3Adaptability or versatility
If the pressure sensor forms part of the fluid enclosure, then device integration is improved, but manufacturing precision requirements increase
Solution Approach 1:
The pressure sensor is divided into modular components (housing, diaphragm, capacitive plates) that can be manufactured separately and then assembled into the fluid enclosure, reducing the precision requirements for the overall integration while maintaining functional integrity
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
The pressure sensor enables real-time monitoring of fluid pressure, preventing overflows, detecting blockages, and identifying unauthorized fluid removal, ensuring safe and effective drug delivery while reducing manufacturing complexity and costs.
Implementation Method 1
The pressure sensor utilizes changes in capacitance between two capacitive plates to detect changes in fluid pressure
Implementation Method 2
The second capacitive plate may be a conductive diaphragm that may deflect with changes in pressure
Data Source
AI summary
The disclosure is directed to a pressure sensor of an implantable medical device. The pressure sensor may utilize detect fluid pressure based on a changing capacitance between two capacitive elements. The pressure sensor may define at least a portion of a fluid enclosure of the IMD. In one example, the pressure sensor has a self-aligning housing shape that occludes an opening in the pump bulkhead of the IMD. An operative surface of the pressure and the portion of the fluid enclosure may be formed of a corrosion resistant and/or biocompatible material. A first capacitive element of the pressure sensor may be a metal alloy diaphragm that deflects in response to external fluid pressure. A second capacitive element of the pressure sensor may be a metal coating on a rigid insulator sealed from the fluid by the diaphragm and a housing of the sensor.