Variable Stiffness Clamping Device for Pelvic Fracture Reduction
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Solution Overview
Problem
Current clamping devices for pelvic fracture reduction robots are prone to deformation and uneven stress under high reduction forces, affecting accuracy due to their lack of variable stiffness and adaptability to different pelvic anatomies.
Innovation Solution
An active variable stiffness clamping device with an affected side adjusting support module and a healthy side fixing module, featuring electric pin rod connector modules and spherical hinges, allows for adjustable stiffness and compact structure to accommodate various pelvic sizes and fracture types, using a gear motor to regulate stiffness during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the clamping device uses a fixed rigid structure to withstand high reduction forces, then strength is improved, but adaptability to different pelvic anatomies deteriorates
Solution Approach 1:
The clamping device employs adjustable support rods with variable stiffness characteristics that can be dynamically configured according to different pelvic anatomies and fracture types. The support rods can be adjusted in length, position, and stiffness to adapt to various patient-specific requirements while maintaining sufficient strength under high reduction forces
Solution Approach 2:
The device allows changing of key parameters including support rod length, stiffness, positioning angles, and clamping forces to match different pelvic dimensions and fracture characteristics. This parameter adjustability enables the same device structure to serve multiple anatomical configurations effectively
2Ease of operation
If the clamping device structure is made compact to fit limited surgical space, then ease of operation is improved, but strength under high reduction forces deteriorates
Solution Approach 1:
The clamping device utilizes a nested structure where support rods, adjustment mechanisms, and clamping components are arranged in a compact, space-efficient configuration. The affected side adjusting support module and healthy side fixing module are integrated in a nested manner to maximize strength while minimizing spatial footprint
Solution Approach 2:
The device is divided into modular segments including the affected side adjusting support module, healthy side fixing module, and multiple adjustable support rods. This segmentation allows each component to be optimized for strength in its specific location while contributing to overall compactness through efficient spatial arrangement
3Device complexity
If the clamping device uses fixed stiffness structure, then device complexity is reduced, but reliability under varying reduction forces deteriorates
Solution Approach 1:
The device incorporates variable stiffness support rods that can be adjusted during surgery to match the specific mechanical requirements of different fracture types and patient anatomies. This dynamic adjustability of stiffness parameters enhances reliability by optimizing the mechanical response under varying reduction forces without significantly increasing overall device complexity
Data Source
AI summary
An active variable stiffness clamping device for pelvic fracture reduction robot, belonging to the technical field of medical robots. The clamping device includes an affected side adjusting support module and a healthy side fixing module which are in fit with each other. The affected side adjusting support module is provided with a pair of electric pin rod connector modules connected to the affected side adjusting support module. The healthy side fixing module includes a healthy side bed clamp seat, the healthy side bed clamp seat is provided with a healthy side support rod, the healthy side support rod is provided with a healthy side spherical hinge base, and the healthy side spherical hinge base is provided with a pair of healthy side fixers which are in clearance fit with each other.