Insert-Molded Microelectrodes for Consistent Cardiac Tissue Contact
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Solution Overview
Problem
Current catheter ablation systems face challenges in ensuring consistent and controlled contact between electrodes and cardiac tissue during procedures, which can affect the efficacy of RF ablation and tissue mapping, and there is a need for improved methods to track electrode position and orientation within the heart.
Innovation Solution
The catheter system incorporates an end effector with insert-molded microelectrodes, a strain gauge assembly for force sensing, and a navigation sensor assembly to ensure precise contact and tracking, along with a guidance and drive system that includes field generators for real-time position data and irrigation fluid delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional catheter electrodes are used without insert-molding, then manufacturing is simpler, but electrode-tissue contact consistency and positioning precision deteriorate
Solution Approach 1:
The microelectrode is merged with the catheter body through insert-molding, creating an integrated structure where the electrode and catheter material form a unified component. This eliminates separate assembly steps and ensures consistent electrode positioning relative to the catheter surface, directly improving electrode-tissue contact consistency while managing manufacturing complexity through process integration.
Solution Approach 2:
The insert-molding process serves multiple functions simultaneously: it secures the microelectrode in place, provides electrical insulation, creates a smooth transition surface for tissue contact, and establishes precise geometric relationships between the electrode and catheter body. This multi-functionality addresses contact consistency without proportionally increasing manufacturing complexity.
2Measurement precision
If microelectrodes are loosely fitted in the catheter, then manufacturing and assembly are easier, but electrode position stability and tracking precision deteriorate
Solution Approach 1:
The microelectrode is merged with the catheter body through insert-molding, creating an integrated structure where the electrode and catheter material form a unified component. This eliminates separate assembly steps and ensures consistent electrode positioning relative to the catheter surface, directly improving electrode-tissue contact consistency while managing manufacturing complexity through process integration.
Solution Approach 2:
The insert-molding process enables precise control of the microelectrode's geometric parameters including its position, orientation, and depth within the catheter body. By controlling molding parameters such as injection pressure, temperature, and mold design, the electrode achieves stable positioning with high tracking precision without requiring complex post-assembly adjustments.
3Reliability
If strain gauge assembly is added for force sensing, then tissue contact detection improves, but device complexity increases
Solution Approach 1:
The strain gauge assembly is merged with the catheter structure, integrating force sensing capabilities into the existing catheter body rather than adding separate external sensors. This integration approach improves tissue contact detection reliability while minimizing the increase in overall device complexity by utilizing the catheter's existing structural elements as part of the sensing mechanism.
Solution Approach 2:
The strain gauge assembly serves multiple functions: it detects tissue contact forces, provides feedback for navigation, and can potentially measure tissue mechanical properties. This multi-functionality justifies the added complexity by delivering comprehensive tissue interaction data that improves procedural reliability and safety.
4Measurement precision
If navigation sensor assembly and field generators are added, then real-time position tracking improves, but system complexity and energy consumption increase
Solution Approach 1:
The navigation sensor assembly and field generators are integrated into a unified navigation system that performs multiple functions: real-time position tracking, orientation determination, and guidance feedback. This multi-functional integration improves position tracking precision while managing energy consumption by coordinating the operation of sensors and field generators to minimize simultaneous high-power demands.
Solution Approach 2:
The navigation system implements continuous feedback loops where position data from sensors is processed and used to guide catheter advancement in real-time. This feedback mechanism improves tracking precision by enabling dynamic adjustment of navigation based on measured position, while energy consumption is managed through efficient signal processing and selective activation of field generators only when needed for position determination.
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 configuration enhances the accuracy and effectiveness of cardiac ablation by ensuring consistent tissue contact, precise electrode positioning, and real-time tracking, thereby improving the outcomes of RF ablation and electrophysiological mapping procedures.
Implementation Method 1
a strain gauge assembly for force sensing
Implementation Method 2
Irrigation may be used to draw heat from ablating components of an ablation catheter
Implementation Method 3
selectively ablating cardiac tissue by application of energy (e.g., alternating-current or direct-current energy)
Data Source
AI summary
An apparatus includes a catheter assembly for use in a medical procedure to conduct electrophysiological mapping. The catheter assembly includes a catheter having an end effector with a tip member. One or more insert-molded microelectrodes are located in the tip member of the end effector for conducting electrophysiological mapping. The insert-molded microelectrodes include a microelectrode and a composite that isolates the microelectrode from contact with the tip member.