Pelvic Clamp Rail Bending Prevention via Segmented Guide
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Solution Overview
Problem
The existing pelvic clamps experience canting and bending issues during adjustment and loosening due to the transmission of forces through the rail, leading to inefficient and time-consuming procedures, especially when securing the clamp nails to the patient's pelvis.
Innovation Solution
A detachable locking device between the arms and the straight guide allows for force distribution mainly along the guide, preventing canting, and a joint mechanism enables the arms to be folded and locked in place, facilitating easy adjustment and compact storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the arms are moved relative to one another along the straight guide to adjust the spacing, then the position can be adjusted, but forces are transmitted through the rail causing canting and bending
Solution Approach 1:
The straight guide is divided into multiple segments that can move independently relative to each other along the guide rails. This segmentation allows the guide to flex and absorb adjustment forces without causing canting or bending of the entire structure, resolving the contradiction between ease of adjustment and structural stability.
Solution Approach 2:
The straight guide transitions from a rigid, fixed structure to a dynamic, multi-segmented structure capable of controlled movement. The segments can dynamically adjust their positions during arm spacing adjustment, allowing the guide to accommodate forces without compromising overall stability or causing deformation.
2Reliability
If threaded spindles are screwed against the patient's pelvis until the rail bends, then the position is fixed, but canting occurs between rail and arms
Solution Approach 1:
By segmenting the straight guide into multiple movable sections, the structure can achieve reliable position fixation through the threaded spindles without transmitting bending forces that cause canting. Each segment can independently accommodate the fixation forces, preventing the canting problem while maintaining reliable positioning.
3Volume of moving object
If the pelvic clamp is made foldable with joints, then it can be stored in conventional containers, but additional joint mechanisms are required
Solution Approach 1:
The pelvic clamp is divided into multiple separable segments or arms that can be folded or detached from one another. This segmentation enables compact storage in conventional containers while the joint mechanisms between segments remain relatively simple, balancing storage requirements with device complexity.
Solution Approach 2:
The foldable design allows one component to be nested within or alongside another when not in use, reducing the overall storage volume to fit conventional containers. The nesting mechanism works in conjunction with the joint structures to achieve compact storage without excessive complexity.
Data Source
AI summary
A pelvic clamp has a rail-like straight guide for two arms which are displaceable relative to one another along this straight guide and project from the straight guide and on each of the free ends of which an approximately tubular carrier for a tip intended for bone contact is provided. A locking device releasable using at least one handle is provided between the two parts displaceable relative to one another, namely between at least one of the arms and the straight guide. Preferably at least one of the arms preferably both arms, is or are capable of being folded or dismantled and thus shortened via at least one joint which can be fixed in a desired position and/or a plug connection.