In Vitro Pericardial Simulator with Pressure-Frequency Feedback
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Solution Overview
Problem
Current medical simulators lack the ability to replicate the unique pressure-frequency relationship in the pericardial fluid, making it difficult to train electrophysiologists for epicardial access procedures safely and effectively, with a significant risk of inadvertent penetration of the right ventricle during sub-xyphoid puncture.
Innovation Solution
An in vitro anatomical training and testing tool that mimics the hydrodynamic pressures within the thoracic and pericardial cavities, using a model system with pressure-frequency profiles to guide clinicians during epicardial access procedures, and a software program to simulate real patient waveforms for training and testing instrumentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional medical simulators are used for training, then training can be conducted, but the unique pressure-frequency relationship in pericardial fluid cannot be replicated, reducing training effectiveness
Solution Approach 1:
The patent creates a physical model of the pericardial cavity that copies the unique pressure-frequency relationship of real pericardial fluid. The model includes a pericardial membrane surrounding a fluid-filled cavity, where the fluid generates characteristic pressure waveforms at specific frequencies that match in vivo measurements, allowing realistic training conditions without using actual patient anatomy
Solution Approach 2:
The patent modifies the physical parameters of the simulation model to match real physiological conditions. The pericardial fluid is configured to produce pressure waveforms with specific frequency ranges (0.5-2 Hz for respiratory component, 1-3 Hz for cardiac component) and amplitude characteristics that replicate the pressure-frequency relationship observed in actual epicardial access procedures
2Ease of operation
If sub-xyphoid puncture is performed without proper guidance, then epicardial access can be attempted, but the risk of inadvertent right ventricle penetration increases
Solution Approach 1:
The patent incorporates pressure sensors that provide real-time feedback on pressure-frequency waveforms during needle advancement. The system monitors the characteristic pressure changes in the pericardial space and provides visual or audible feedback to guide the operator, enabling safe navigation through the diaphragm and into the pericardial cavity while avoiding penetration of the right ventricle
Solution Approach 2:
The patent uses the pericardial pressure-frequency waveform as an intermediary indicator to guide needle placement. By monitoring the characteristic pressure signature of the pericardial space, the system provides an indirect but reliable guide for safe needle advancement, allowing operators to confirm proper positioning without direct visualization of deep anatomical structures
3Reliability
If more realistic simulation of pressure characteristics is implemented, then training realism improves, but device complexity increases
Solution Approach 1:
The patent divides the simulation system into distinct functional modules: a pericardial cavity model with fluid-filled chamber, a pericardial membrane layer, pressure sensing components, and a control system. This segmentation allows each component to be optimized independently while maintaining overall system manageability and ease of assembly
Solution Approach 2:
The patent uses fluid dynamics and pressure wave propagation through the pericardial cavity to generate realistic pressure-frequency waveforms naturally. By utilizing the physical properties of the fluid-filled cavity and membrane system, the model produces authentic physiological pressure patterns without requiring complex electronic generation or active control 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
This solution allows for the development of a cost-effective, humane, and repeatable method to train practitioners in epicardial access procedures, reducing the risk of complications by providing a realistic simulation of pressure characteristics and anatomical features, thus enabling safer and more routine performance of epicardial access procedures.
Implementation Method 1
the unique pressure-frequency relationship that has been observed in the pericardial fluid
Data Source
AI summary
An aspect of various systems and methods provides, but not limited thereto, novel means for simulating physiological systems and processes in vitro in order to test surgical devices and train practitioners in the use of surgical devices. An aspect of various embodiments further provides in vitro anatomical components, such as a thorax, lungs, heart and pericardium, configured to contain at least one fluid having a pressure-frequency profile that may mimic typical pressure-frequency waveforms of in vivo anatomical fluids. A model communication system may be used to communicate the desired pressure-frequency profiles to the in vitro anatomical fluids. In a further aspect of various embodiments, an access device, e.g. a surgical instrument, configured to sense pressure, frequency, and/or a pressure-frequency profile may be inserted into one or more anatomical components of the in vitro model in order to test the instrument and/or train a practitioner in proper use of the instrument. An access device communication system may be used to communicate data to the practitioner. This data may include, for example, pressure-frequency data and/or the location of a portion of the access device with respect to the various in vitro anatomical components.