Tissue Grasping Device with Rotatable Loop Portions
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Solution Overview
Problem
Existing tissue grasping devices, such as basket-shaped forceps, are inefficient in collecting necrotic tissues during endoscopic necrosectomy, leading to prolonged treatment times due to the slippage of tissues from the grasping portion, requiring multiple collection and removal steps.
Innovation Solution
A tissue grasping device with a treatment portion featuring rotatably supported actuating members and loop portions that protrude and retract along a third axis, increasing the grasping area and allowing for the collection of a larger amount of necrotic tissues in a single operation by adjusting the loop portions' length and diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a basket-shaped forceps is used as the tissue grasping device, then the device structure is simple and easy to manufacture, but the necrotic tissues slip away from the grasping portion resulting in small collection amount
Solution Approach 1:
The treatment portion is divided into multiple actuating members (first and second actuating members) that can independently rotate and position loop portions. This segmentation allows the grasping structure to adapt to tissue shapes while maintaining structural organization, resolving the contradiction between collection amount and device complexity
Solution Approach 2:
Loop portions are configured to protrude in a third axis direction (Z-axis) perpendicular to the longitudinal axis (X-axis) and opening/closing direction (Y-axis). This three-dimensional configuration expands the grasping volume and surface area, enabling collection of larger amounts of necrotic tissues without proportionally increasing device complexity
2Area of moving object
If the loop portions protrude in the third axis direction to increase grasping area, then the collection amount of necrotic tissues increases, but the device structure becomes more complex
Solution Approach 1:
The actuating members are rotatably supported rather than fixed, allowing the loop portions to dynamically adjust their position and orientation. This dynamic capability enables the grasping area to be optimized for different tissue sizes and shapes without requiring multiple fixed complex structures
Solution Approach 2:
The loop portions are formed by wires that pass through the actuating members and can be nested within the treatment portion when not in use. This nesting approach allows the extended grasping structure to be compact when retracted, reducing the apparent device complexity while maintaining large grasping area when needed
3Productivity
If basket-shaped forceps are used for necrosectomy, then the device is easy to operate, but multiple collection and removal steps are required lengthening treatment time
Solution Approach 1:
The loop portions are pre-configured to protrude in the third axis direction, creating a three-dimensional grasping structure before tissue contact. This preliminary configuration enables the device to capture larger volumes of necrotic tissues in a single operation, reducing the number of repeated collection steps and treatment time
Data Source
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AI summary
A tissue grasping device includes a first actuating member and a second actuating member that are provided at a distal end portion of a longitudinal axis member and are capable of approaching and separating each other, and a first loop portion and a second loop portion that are curved in a loop shape by a wire member. A first actuating member includes a first restricting portion that restricts an extending direction of a first end portion of the first loop portion. A second actuating member includes a second restricting portion that restricts an extending direction of a first end portion of the second loop portion. The first end portion of the first loop portion intersects an outer side surface of the first actuating member and extends to the outside of the outer side surface of the first actuating member. The first end portion of the second loop portion intersects an outer side surface of the second actuating member and extends to the outside of the outer side surface of the second actuating member.