Dual-Grasper Tissue Recruitment for Large Defect Closure
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Solution Overview
Problem
Conventional tissue recruiting devices struggle to adequately grasp and recruit multiple sides of larger tissue defects, particularly in fibrotic tissue, leading to difficulties in deploying hemostatic devices to close defects effectively.
Innovation Solution
A tissue recruiting device with independently controlled first and second grasping devices, operably coupled to actuation elements, allows for simultaneous grasping of tissue at multiple locations, which can be retracted into a shroud and decoupled from the catheter for secure closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional tissue recruiting techniques are used, then the device structure remains simple, but the ability to grasp and recruit multiple sides of larger defects is insufficient
Solution Approach 1:
The tissue recruiting device is divided into multiple independent grasping devices (first grasping device, second grasping device, etc.), each capable of independently grasping tissue at different locations. This segmentation allows the device to simultaneously grasp multiple sides of a defect, improving adaptability while maintaining manageable complexity through modular design
Solution Approach 2:
Each grasping device is designed with universal functionality to grasp tissue at various locations around a defect. The multiple grasping devices can be independently controlled to adapt to different defect sizes and shapes, making the system versatile for various tissue recruitment scenarios without requiring completely different devices
2Reliability
If independently controlled grasping devices are added to improve tissue recruitment, then the effectiveness of closing larger defects improves, but the device complexity increases
Solution Approach 1:
The control system is segmented into multiple independent control actuators, each dedicated to controlling a specific grasping device. This segmentation provides reliable independent control for each grasping operation, ensuring that each grasping device can be precisely maneuvered to grasp tissue at the desired location, thereby improving overall defect closure effectiveness
Solution Approach 2:
The actuation elements serve as intermediaries between the control actuators and the grasping devices. These intermediaries transmit the control signals and forces from the actuators to the grasping devices, enabling reliable control while managing the complexity of coordinating multiple independent grasping operations
3Ease of operation
If the shroud is decoupled from the catheter to allow grasping device retraction, then the ease of operation improves, but the device complexity increases
Solution Approach 1:
The coupling between the shroud and catheter is designed to be dynamic rather than fixed. The shroud can be decoupled from the catheter when needed to allow the grasping devices to be retracted into the shroud, providing ease of operation. This dynamic coupling mechanism manages complexity by only requiring the decoupling feature at specific stages of the procedure
Data Source
AI summary
A tissue recruiting device for treating and closing a defect and methods of using the same. The tissue recruiting device includes a tissue recruiting assembly with two grasping devices and a shroud. An actuation assembly couples control actuators to the grasping devices via actuation elements. The grasping devices may be maneuvered to grasp tissue from different locations by actuation of the control actuators. The grasping devices may be retracted into a shroud to substantially close the defect. The grasping devices and the shroud may be decoupled from the remainder of the tissue recruiting assembly to maintain closure of the defect.