Segmented Orthopedic Screw Fixation and Sizing Tools
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Solution Overview
Problem
Current orthopedic screw implants have limited cortical fixation in metacarpal and metatarsal necks, and there is a lack of effective tools for accurately determining the desired screw length and diameter, leading to inefficiencies and increased trauma during procedures.
Innovation Solution
The development of orthopedic stabilization implants with varying thread structures and diameters, along with orthopedic tools equipped with sizing surfaces and length markers, allows for precise selection and placement of implants, enhancing cortical fixation and procedural efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-thread structure is used in the screw implant, then the device complexity is reduced, but the cortical fixation strength in metacarpal and metatarsal necks is limited
Solution Approach 1:
The screw implant is divided into multiple thread structures with different characteristics along its length. The proximal region contains a first thread structure optimized for cortical fixation in the metacarpal/metatarsal neck, while the distal region contains a second thread structure for medullary fixation. This segmentation allows each thread structure to be independently optimized for its specific functional region, thereby increasing overall fixation strength without requiring excessive complexity in any single component.
Solution Approach 2:
Different portions of the screw implant are given different thread properties tailored to local requirements. The first thread structure in the proximal region has parameters (pitch, depth, diameter) specifically designed for engaging cortical bone in the neck region, while the second thread structure in the distal region has different parameters suited for medullary bone. This local differentiation of quality ensures optimal fixation strength in each anatomical region without uniformly increasing complexity throughout the entire device.
2Measurement precision
If external assessment is used to estimate screw size, then the procedure time is reduced for experienced surgeons, but sizing accuracy decreases and may require implant removal
Solution Approach 1:
The orthopedic tool performs preliminary measurement and sizing actions before the actual implantation procedure. By providing pre-calibrated sizing surfaces and length markers that allow the surgeon to determine the correct implant dimensions in advance, the tool eliminates the need for trial-and-error estimation during surgery. This preliminary sizing action ensures measurement precision while actually reducing total procedure time by preventing the need for implant removal and re-implantation.
Solution Approach 2:
The orthopedic tool serves as an intermediary device between the surgeon's estimation and the final implant selection. The tool includes sizing surfaces with known dimensions and length markers that provide objective reference standards, mediating between subjective external assessment and precise implant sizing. This intermediary measurement system improves accuracy by providing tangible, measurable references while streamlining the decision-making process.
3Productivity
If an incorrectly sized implant is used, then the initial procedure may be completed quickly, but additional trauma occurs during removal and re-implantation
Solution Approach 1:
The orthopedic tool performs preliminary sizing measurements before implantation to ensure the correct implant is selected on the first attempt. By establishing accurate dimensional references in advance through the sizing surfaces and length markers, the system prevents incorrect implant selection that would lead to removal procedures. This preliminary action ensures both procedural efficiency and patient safety by eliminating the harmful factor of repeated bone trauma.
Solution Approach 2:
The measurement and sizing system provides a protective function by preventing incorrect implant selection before the procedure begins. The pre-established sizing references act as a cushion against errors, ensuring that the first implantation attempt is successful and avoiding the need for removal. This beforehand protection eliminates the harmful effect of additional trauma to bone and surrounding anatomy that would result from incorrect sizing and subsequent removal procedures.
Data Source
AI summary
Orthopedic implants for fixation of bone fractures to provide increase purchase of the orthopedic implant within specific regions of the repaired bone. Orthopedic accessory tools such as drill bits and multi-functional orthopedic sizing tools. Kits containing such orthopedic devices and methods for the use of such orthopedic implants, drill bits, and orthopedic tools.