Self-Tapping Orthopedic Fixator for Resource-Limited Fracture Care
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Solution Overview
Problem
The treatment of complex or displaced fractures in precarious environmental conditions, such as those found in underdeveloped countries, is hindered by the lack of suitable surgical equipment, hygiene issues, and the inability to perform automated boring of the medullary canal and sterilization of surgical equipment, making existing orthopedic external fixation systems ineffective.
Innovation Solution
An integrated orthopedic external fixation system featuring a cylindrical fixator body with adjustable components and self-tapping bone screws designed for easy assembly and stabilization, using materials like plastic or metal alloys, and allowing for axial sliding and torsional stability, which can be assembled with minimal tooling and sterilized using steam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex orthopedic external fixation systems with multiple components and adjustments are used, then treatment precision and adaptability improve, but device complexity and difficulty of assembly increase beyond what is available in precarious surgical environments
Solution Approach 1:
The external fixation system is divided into separate modular components including the fixator body, bone screws with threaded portions, and interconnection elements. Each component can be independently manufactured and sterilized, then assembled together during surgery using simple interlocking mechanisms that do not require precision tools or complex procedures.
Solution Approach 2:
The bone screws are designed with self-tapping threaded portions that automatically form threads in the bone during insertion, eliminating the need for pre-drilling with specialized surgical drills. The threaded rear portion of the bone screw automatically engages with the threaded bore in the fixator body, providing self-aligning and self-securing connection without requiring precision alignment tools or complex assembly procedures.
2Reliability
If automated boring equipment and advanced sterilization systems are used, then surgical safety and equipment reliability improve, but equipment availability and cost increase in underdeveloped countries
Solution Approach 1:
The external fixation system is designed as a disposable single-use device that can be sterilized using simple steam sterilization methods available in basic surgical facilities. After one use, the entire system is discarded, eliminating the need for complex re-sterilization equipment and ensuring hygiene without requiring advanced sterilization infrastructure. This approach prioritizes surgical safety through sterility while maintaining affordability and accessibility in resource-limited settings.
3Measurement precision
If specialized surgical drills and screw guides are used, then bone screw insertion accuracy improves, but equipment requirements and operational difficulty increase in resource-constrained environments
Solution Approach 1:
The bone screw incorporates a self-aligning threaded rear portion that automatically engages with the threaded bore in the fixator body. This design eliminates the need for precision alignment during assembly, as the threading guides the screw into proper orientation automatically. The self-tapping threaded front portion similarly guides itself during bone insertion, providing accurate placement without requiring specialized drill guides or alignment tools.
4Adaptability or versatility
If adjustable and reconfigurable fixator components are used, then treatment versatility improves, but device complexity and sterilization difficulty increase in precarious surgical conditions
Solution Approach 1:
The fixator system uses separate modular components including the fixator body, bone screws, and interconnection elements that can be independently sterilized and then assembled in various configurations during surgery. This modular design provides treatment versatility for different fracture types and locations while keeping each individual component simple in design and easy to manufacture and sterilize using basic steam sterilization equipment.
Data Source
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AI summary
The present invention relates to an integrated orthopedic external fixation system (1), for the treatment of complex or displaced fractures under precarious environmental conditions, of the type comprising an external fixator (2, 2') and a plurality of bone screws (3, 3') for fixing the fixator to a fractured long bone. Advantageously, the system (1) according to the present invention comprises: a pair of cylindrical portions (4, 5) interconnected coaxially together by means of interlocking connection means (6, 7) able to adjust the movement towards and away from each other of these portions (4, 5); a plurality of through-holes (16, 16') formed transversely with respect to the axis (X) of the body of the fixator (2, 2') and at a predefined distance from the opposite free ends (21, 22) of the fixator (2, 2'), for receiving a respective bone screw (3, 3'); each bone screw (3, 3') having a smooth cylindrical central section and being slidably engaged in a guided manner inside the corresponding hole (16, 16') of the body of the fixator (2, 2'); a threaded front tip portion, intended to come into screwing engagement with said long bone, in a substantially self-tapping manner; and a threaded rear tail portion intended to come into screwing engagement with the corresponding hole (16, 16') of the fixator body (2, 2'), in a substantially self-tapping manner.