Disposable CPB Transducer for Cardiopulmonary Bypass Monitoring
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Solution Overview
Problem
Current pressure and temperature monitoring systems for cardiopulmonary bypass procedures are inadequate due to insufficient value ranges and design limitations, leading to assembly difficulties, clotting issues, damping of pressure waves, and measurement errors.
Innovation Solution
An integrated system comprising a disposable CPB transducer and minimonitor that allows direct contact with the cardiopulmonary bypass circuit, eliminating the need for fluid priming and reducing the risk of clotting, with real-time measurement capabilities and compatibility with both pressure and temperature monitoring, and an optional central monitor for expanded functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical pressure transducer with fluid-filled dome is used, then pressure isolation is achieved, but assembly difficulty increases and pressure wave damping occurs
Solution Approach 1:
The patent removes the fluid-filled dome and membrane isolation mechanism from the transducer design. Instead, it uses a solid-state pressure sensor that directly contacts the blood through a filtered interface, eliminating the complex assembly steps and pressure wave damping associated with mechanical domes while maintaining pressure isolation through the sensor's inherent design
Solution Approach 2:
The patent replaces the mechanical fluid-filled dome system with an electronic solid-state pressure sensor. This substitution eliminates the need for fluid filling, membrane positioning, and mechanical pressure transmission, thereby simplifying assembly and preventing pressure wave damping while achieving pressure isolation through the sensor's direct contact design with blood filtration
2Reliability
If a mechanical pressure transducer with fluid-filled dome is used, then pressure isolation is achieved, but blood entry into the dome causes clotting and disrupts pressure reading
Solution Approach 1:
The patent removes the enclosed fluid-filled dome chamber that traps blood and causes clotting. Instead, it employs an open design where the pressure sensor directly contacts blood through a filtered interface, allowing continuous blood flow that prevents clot formation while maintaining pressure measurement accuracy
Solution Approach 2:
The patent ensures continuous blood flow through the transducer by eliminating the enclosed dome chamber. The open design with direct sensor contact allows uninterrupted blood circulation, preventing clotting while continuously providing accurate pressure readings, thus maintaining the useful action of pressure monitoring without the harmful effect of clotting
3Measurement precision
If a disposable electronic pressure transducer with flush device is used, then modern pressure monitoring is achieved, but blood backflow exceeds flush capability causing clotting
Solution Approach 1:
The patent removes the flush device and enclosed transducer chamber design. Instead, it uses an open system where the pressure sensor directly contacts blood through a filtered interface, eliminating the need for high-pressure flushing while preventing clotting through continuous blood flow and direct sensor contact
Solution Approach 2:
The patent enables the blood flow itself to serve the dual function of providing pressure measurement and preventing clotting. The continuous blood flow through the open sensor interface naturally flushes the measurement path without requiring an external high-pressure flush device, making the system self-servicing and eliminating the clotting problem
4Reliability
If a liquid column is used to connect transducer to measurement point, then pressure transmission is achieved, but height difference causes measurement error
Solution Approach 1:
The patent removes the liquid column connection and associated height reference requirements. Instead, it employs a solid-state pressure sensor that directly contacts the blood at the measurement point, eliminating the liquid column and its gravitational effects, thereby achieving accurate pressure measurement without height compensation
Solution Approach 2:
The patent replaces the liquid column pressure transmission system with a solid-state pressure sensor that directly measures blood pressure at the measurement point. This substitution eliminates the need for liquid columns, height references, and gravitational compensation, providing accurate pressure measurements regardless of transducer position
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 system provides accurate, real-time monitoring with reduced errors and costs, offering improved signal quality, simplicity, and reliability by eliminating fluid columns and intermediate cables, and enabling direct electrical connections, thus enhancing the monitoring of physiological variables during cardiopulmonary bypass procedures.
Implementation Method 1
a pressure sensor, which is installed inside a sensor compartment of a disposable transducer
Implementation Method 2
a temperature sensor, which is installed inside the sensor compartment of the disposable transducer
Data Source
AI summary
The present invention relates to an integrated system for monitoring physiological variables in cardiopulmonary bypass process, which utilizes a transducer specifically intended to act directly on the cardiopulmonary bypass. Said system according to the present invention comprises at least two components, one is a CPB transducer and a minimonitor, coupled to each other by means of a cable and an electrical connector.