Articulating Surgical Shaft With Cable Ferrules
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Solution Overview
Problem
Robotic surgical systems face challenges in designing surgical forceps that effectively grasp, treat, and sever tissue using a combination of mechanical and energy-based mechanisms, particularly in achieving precise articulation and cutting within the constraints of robotic surgical systems.
Innovation Solution
The surgical instrument features an elongated shaft with an articulating segment, a jaw assembly, and a blade mechanism, utilizing articulation cables and ferrules for precise control and actuation, along with a blade rod and ferrule for lateral translation, enabling effective grasping, treatment, and cutting of tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an articulating segment is added to the shaft to enable precise articulation, then the precision of tissue manipulation is improved, but the device complexity increases
Solution Approach 1:
The shaft is divided into multiple segments including a proximal segment, an articulating segment, and a distal segment. This segmentation allows each portion to perform specific functions independently, enabling precise articulation while maintaining manageable device complexity through modular design.
Solution Approach 2:
The articulating segment introduces dynamic movement capability to the shaft, allowing it to change orientation and articulate at different angles. This dynamic feature enables precise tissue manipulation while the modular segmented structure helps manage the added complexity through standardized interfaces.
2Adaptability or versatility
If a blade mechanism is integrated into the jaw assembly for tissue cutting, then the functionality is improved, but the device complexity increases
Solution Approach 1:
The blade mechanism is merged with the jaw assembly, combining cutting functionality with the existing grasping mechanism. This integration allows the instrument to perform multiple functions (grasping, treating, and cutting) through a unified structure, improving versatility while managing complexity through functional consolidation.
Solution Approach 2:
The jaw assembly is designed to serve multiple functions: it can grasp tissue using the jaw members, treat tissue using energy-based mechanisms, and cut tissue using the integrated blade. This multi-functionality improves adaptability while the standardized modular design helps manage the added complexity.
3Measurement precision
If articulation cables with ferrules are used for precise control, then the precision of actuation is improved, but the manufacturing complexity increases
Solution Approach 1:
Ferrules are introduced as intermediary components that connect the articulation cables to the shaft segments. These ferrules simplify the connection process by providing standardized interfaces, reducing manufacturing complexity while maintaining the precision of cable actuation through secure, repeatable connections.
Solution Approach 2:
The use of standardized ferrule components allows for parameter standardization in the manufacturing process. By establishing standard connection parameters and tolerances for the ferrule-cable-shaft interface, the precision of actuation is maintained while manufacturing complexity is reduced through repeatability and modularity.
Data Source
AI summary
A surgical instrument includes an elongated shaft including an articulating segment. A jaw assembly extends from a distal segment of the elongated shaft. A first jaw member can be actuated between a closed configuration and an open configuration. An articulation cable assembly includes a first articulation cable including a first extending portion, a second extending portion spaced apart from the first extending portion, and a loop portion connecting distal ends of the first and second extending portions of the first articulation cable. A first ferrule is positioned about the loop portion of the first articulation cable. A second articulation cable includes a first extending portion, a second extending portion spaced apart from the first extending portion, and a loop portion connecting distal ends of the first and second extending portions of the second articulation cable. A second ferrule is positioned about the loop portion of the second articulation cable.