Surgical Instrument Rotation Control via Motion Sensing
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Solution Overview
Problem
Endoscopic surgical instruments with manual rotation features can cause fatigue and stress for surgeons due to the need for manual manipulation of the end effector relative to the handle assembly.
Innovation Solution
Incorporating a motor assembly and motion sensing system within the handle assembly that senses movement and rotates the end effector in response, allowing for automatic rotation and including a rotation control mechanism that can be engaged by the clinician, such as a potentiometer, to manage the rotation of the elongate member relative to the handle assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual rotation features are used to rotate the end effector, then the surgeon can control the orientation of the end effector, but the surgeon experiences fatigue and stress in the fingers
Solution Approach 1:
The patent replaces the manual mechanical rotation system with an automated motor assembly. The motor assembly includes a motor and drive mechanism that automatically rotates the elongate member and end effector based on sensed movement of the handle assembly, eliminating the need for manual finger manipulation and thereby reducing surgeon fatigue and stress.
Solution Approach 2:
The system performs self-service by automatically rotating the end effector based on sensed handle movement. The motion sensing assembly detects handle movement and the motor assembly automatically adjusts the end effector orientation without requiring additional manual input from the surgeon, making the system self-adjusting and reducing operational burden.
2Ease of operation
If a motor assembly is added to automate rotation, then surgeon fatigue is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the motion sensing assembly and motor assembly into the existing handle assembly structure. The motion sensing assembly senses handle movement and the motor assembly is integrated to rotate the elongate member, combining multiple functions (sensing, processing, and actuation) within a single integrated unit rather than adding separate external components.
Solution Approach 2:
The handle assembly is designed to perform multiple functions: it serves as the control interface for the surgeon, houses the motion sensing assembly for detecting handle movement, contains the motor assembly for automated rotation, and controls both the elongate member rotation and end effector actuation. This multi-functionality reduces the need for separate components and minimizes overall system complexity.
3Adaptability or versatility
If rotation is allowed during all operations, then the surgeon has full control, but unwanted rotation occurs during energy delivery or clamping
Solution Approach 1:
The patent implements feedback control through a rotation lockout mechanism that receives input from sensors detecting the state of the end effector and clamp trigger. When the end effector is in the closed configuration or the clamp trigger is actuated, the lockout mechanism receives feedback and automatically prevents rotation of the elongate member, ensuring reliability during critical operations while maintaining rotation flexibility during other phases.
Solution Approach 2:
The rotation control system is dynamic rather than static. The rotation lockout mechanism dynamically adjusts the rotation capability based on real-time operational conditions. During energy delivery or clamping operations, rotation is automatically locked out, while during other phases, full rotation control is available. This dynamic adaptation ensures both versatility and reliability.
Data Source
AI summary
A surgical instrument includes a handle assembly, an elongate member, and a motor assembly. The elongate member extends from the handle assembly and defines a longitudinal axis of the surgical instrument. The motor assembly is disposed within the handle assembly and is configured to rotate the elongate member about the longitudinal axis relative to that handle assembly in response to sensed movement of the handle assembly about the longitudinal axis.