Surgical Handling Device Rod Coupling Rotation
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Solution Overview
Problem
Current micro-invasive surgical instruments face challenges in easily rotating the tool relative to the shaft during procedures, especially when using instruments with curved shafts, and there is a need for a solution that allows for easy cleaning and secure coupling of the tool, shaft, and handling device without auxiliary means.
Innovation Solution
A handling device with a rod coupling that can slide between assembly and working positions, allowing the shaft to rotate while blocked, and a slide bar that facilitates torque transmission and automatic orientation of the transmission rod, enabling secure coupling and easy disassembly for cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the shaft is curved to enable micro-invasive access through a single trocar, then the ability to access deep body cavities is improved, but the ease of rotating the tool around its longitudinal axis deteriorates
Solution Approach 1:
The instrument is divided into separable components: the tool (jaw member), the shaft, and the handling device. This segmentation allows the tool to be detached and reattached after shaft rotation, enabling independent orientation adjustment without rotating the entire shaft assembly.
Solution Approach 2:
The bayonet lock mechanism provides dynamic coupling that allows the tool to be quickly detached and reattached at different angular positions. This dynamic connection enables the tool orientation to be changed relative to the curved shaft during the procedure.
2Ease of repair
If the tool, shaft, and handling device are made separable for easy cleaning, then the ease of maintenance is improved, but the reliability of secure coupling deteriorates
Solution Approach 1:
The bayonet lock mechanism is pre-configured with alignment features and engagement surfaces that ensure proper orientation and secure coupling when components are assembled. The preliminary design of the coupling geometry guarantees reliable connection without requiring complex locking procedures.
Solution Approach 2:
The traditional complex mechanical locking system is replaced with a simplified bayonet lock mechanism that uses quarter-turn engagement and friction-based holding. This substitution maintains coupling security while enabling quick assembly and disassembly for cleaning.
3Manufacturing precision
If the rod coupling is fixed in position, then the manufacturing precision is improved, but the ease of operation for automatic orientation deteriorates
Solution Approach 1:
The slide bar mechanism enables the rod coupling to automatically orient itself during the assembly process. When the tool and shaft are coupled, the rod coupling slides along the slide bar to its correct position and orientation without requiring manual adjustment, achieving self-alignment.
Solution Approach 2:
The slide bar acts as an intermediary element between the handling device and the transmission rod. It guides the rod coupling to the correct position and maintains proper orientation during assembly, ensuring manufacturing precision while enabling automatic orientation.
Data Source
AI summary
A handling device for a micro-invasive surgical instrument includes a gripping device, a shaft coupling, and a rod coupling. The gripping device is configured to guide and hold the handling device. The shaft coupling is configured to detachably couple a proximal end of a shaft to the handling device. The rod coupling is configured to slide in the handling device between an assembly position and a range of working positions to detachably couple a proximal end of a transmission rod to the handling device. The transmission rod is disposed in the shaft. The shaft coupling is configured to block the proximal end of the shaft in a predetermined position in which the proximal end of the shaft holds the rod coupling in the range of working positions.