Pelvis Fixator With Unidirectional Locking For Single Operator Use
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Solution Overview
Problem
Existing pelvic fixation devices are complex to use for single operators, prone to incorrect positioning due to the need for iterative arm movements, and require a large, unobstructed environment with two operators for proper alignment and assembly, which increases the risk of device displacement and assembly errors.
Innovation Solution
A pelvic fixator device with unidirectional locking means that allows for easy deployment and positioning by a single operator, featuring a pawl and rack mechanism for automatic engagement and a compact design with sliding rods and tubular sleeves for precise alignment, enabling one-handed operation and eliminating the need for disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the device uses iterative arm movements for positioning, then the arms can be adjusted to enclose the patient, but the risk of untimely displacement and incorrect positioning increases
Solution Approach 1:
The device employs a preliminary alignment phase where arms are brought into approximate position using intuitive manual manipulation, followed by a secure locking phase. The locking mechanism pre-positions the arms relative to each other and to the patient's pelvis before final tightening, eliminating the need for iterative adjustments during the critical securing phase.
Solution Approach 2:
The self-locking mechanism automatically maintains arm position once adjusted, without requiring continuous operator intervention. The mechanical locking system engages automatically when arms reach the correct position, and the friction-based holding mechanism prevents unintended displacement, making the device self-sustaining after initial positioning.
2Measurement precision
If two operators are used for positioning, then the device can be positioned more accurately, but the number of responders and space requirements increase
Solution Approach 1:
The device is designed with symmetric, identical arms that can be manipulated independently yet function together as a unified system. Each arm has identical locking and adjustment mechanisms, allowing a single operator to control both arms using the same techniques and force applications, eliminating the need for coordinated multi-operator manipulation.
Solution Approach 2:
The device integrates both arm adjustment and locking functions into a single operational sequence controlled by one operator. The mechanical linkage between arms and the centralized locking mechanism allow one operator to simultaneously control positioning and securing of both arms, merging functions that would traditionally require multiple operators.
3Volume of moving object
If the device is supplied in disassembled elements, then it can be stored compactly, but assembly time and error risk increase
Solution Approach 1:
The device is divided into modular components (arms, locking mechanisms, connecting elements) that can be separately packaged and stored in a compact configuration. Each segment is designed with standardized interfaces and identification features that guide rapid, error-free assembly through intuitive connection without requiring complex alignment or multiple steps.
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
The device allows for rapid, precise, and stable pelvic fixation by a single operator, reducing the risk of displacement and assembly errors, while maintaining a compact storage footprint and eliminating the need for multiple operators or extensive space for assembly.
Implementation Method 1
elastic return means permanently return the pawl to its engagement position
Implementation Method 2
the unidirectional locking means comprise a pawl cooperating with a rack rod
Implementation Method 3
a first and a second arm arranged to slide by sliding means allowing a relative distance
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The device (1) has two arms (2, 3) slidably arranged by a slide (4) for allowing relative spacing and relative connection of the arms according to a direction (I-I). One-way locking units (15, 16) are operable toward a clutching state in which the one-way locking units authorize the relative connection of the arms while opposing relative spacing of the arms. A clutch unit (6) selectively activates the locking units toward the clutching state from a disengaging state in which the locking units authorize relative connection and relative spacing of the arms.