Medical Device Handle Assemblies for Rotation and Deflection Control
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Solution Overview
Problem
Existing medical devices face challenges in providing intuitive control and placement within a subject during minimally invasive procedures, leading to prolonged procedures and potential injury due to device failure or breakage.
Innovation Solution
A medical device with a handle assembly that includes a movable body and a fixed body, allowing for rotation and deflection of an end effector relative to a shaft, facilitated by actuators and actuation wires, enabling precise control and positioning through a combination of rotation and deflection mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a medical device uses a fixed handle assembly, then the device structure is simple, but the control and positioning capability is limited
Solution Approach 1:
The handle assembly is divided into a fixed body and a movable body that can rotate relative to each other. The movable body includes an actuator that can be independently operated, allowing separate control of the end effector's rotation and shaft orientation. This segmentation enables intuitive control while maintaining a manageable structural complexity through modular design.
2Measurement precision
If the handle assembly allows independent rotation and deflection control, then the positioning precision is improved, but the device complexity increases
Solution Approach 1:
A movable body acts as an intermediary mechanism between the user's manual input and the end effector. This movable body translates simple rotational movements into coordinated rotation and deflection of the end effector and shaft, achieving precise positioning while keeping the actuation mechanism relatively simple through mechanical advantage and kinematic coupling.
3Measurement precision
If the medical device uses complex actuation mechanisms, then the control precision is improved, but the risk of device failure increases
Solution Approach 1:
The actuation mechanism is designed with localized functional zones where specific components handle specific tasks. The fixed body provides stable mounting, the movable body handles rotation control, and the actuator handles deflection control. This distribution of functionality reduces stress concentration and potential failure points, improving reliability while maintaining control precision.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A medical device may include a handle including a fixed body and a movable body. The movable body may be movable relative to the fixed body. The medical device may include a shaft extending from the fixed body and an end effector at a distal end of the shaft. Rotation of the movable body relative to the fixed body may permit rotation of the end effector relative to the shaft, and rotation of the movable body with rotation of the fixed body may permit rotation of the end effector with the shaft. Deflection of the movable body relative to the fixed body may permit deflection of the end effector relative to the fixed body.