Robotic Surgical Drive Assembly Tension Management
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Solution Overview
Problem
Current robotic surgical systems face challenges in providing robust and secure instrument drive assemblies that efficiently actuate surgical instruments, particularly in maintaining tension and preventing slack in drive members during manipulation and movement.
Innovation Solution
The proposed solution involves an instrument drive assembly with a proximal and distal housing, a locking mechanism, and a biasing element, including a compression spring and magnets, which ensures secure engagement and maintains tension in drive members by compensating for slack through coordinated movement of drive nuts and followers, and incorporates a wire channel to manage electrical wires effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a robotic surgical system uses cables and motors to actuate end effectors and wrist assemblies, then the system can provide precise control and multiple degrees of freedom for surgical manipulation, but the system may experience cable slack and loss of tension during movement and manipulation
Solution Approach 1:
The drive assembly incorporates movable components including a movable pulley and adjustable tensioning mechanisms that dynamically adapt to maintain cable tension during instrument manipulation. The system allows dynamic adjustment of cable routing and tensioning points to compensate for changes in cable length and orientation during surgical procedures.
Solution Approach 2:
The system employs adjustable tensioning mechanisms that modify physical parameters such as cable tension force, pulley positions, and routing angles. These parameter changes enable the system to maintain optimal tension levels across different operational states and instrument configurations.
2Reliability
If the instrument drive assembly uses a secure locking mechanism to prevent slack, then tension maintenance improves, but the complexity of the assembly increases
Solution Approach 1:
The drive assembly incorporates self-tensioning mechanisms that automatically maintain cable tension without requiring external intervention or complex active control systems. The movable pulleys and adjustable tensioners self-adjust based on cable routing changes and instrument movement, providing automatic slack prevention.
Solution Approach 2:
The locking and tensioning function is divided into discrete modular components including individual pulleys, tensioning adjusters, and cable routing elements. This segmentation allows each component to perform its specific function independently while contributing to the overall tension maintenance system.
3Manufacturing precision
If the drive assembly incorporates components to compensate for cable slack, then operational precision improves, but the number of parts and assembly complexity increases
Solution Approach 1:
The drive assembly components serve multiple functions: the movable pulleys provide both cable routing and tension maintenance, the adjustable tensioners provide both slack compensation and actuation control, and the housing structure provides both mechanical support and cable guidance. This multi-functionality reduces the need for separate dedicated components for each function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the robustness and reliability of the instrument drive assembly by preventing drive member slack and maintaining tension, ensuring precise and secure operation of surgical instruments, while also managing wires to maintain system integrity.
Implementation Method 1
a biasing element, which may be a compression spring or a magnet
Implementation Method 2
The biasing element may include a first magnet disposed in mechanical cooperation with the proximal coupler and a second magnet disposed in mechanically cooperation with the distal coupler
Data Source
AI summary
A drive assembly of an instrument drive assembly, is provided. The drive assembly includes a drive screw, a drive nut, a follower, a biasing element, and a drive element. The drive nut is threadedly engaged with a threaded portion of the drive screw such that rotation of the drive screw results in longitudinal movement of the drive nut. The follower is longitudinally slidable with respect to the drive screw. The biasing element is disposed in mechanical cooperation with the drive nut and the follower. The drive element is disposed in mechanical cooperation with the follower. Longitudinal translation of the drive element is configured to drive a function of the surgical instrument.