Bone Fixing Screw Template with Detachable Spacer Tube
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Solution Overview
Problem
Current bone fixation surgeries using medical screws face challenges in accurately determining the position, direction, and depth of screw insertion, leading to potential nerve damage and instability due to the complexity of bone shape and variability among patients, and existing templates are not effective in ensuring precise alignment and continuous screw tightening without template detachment.
Innovation Solution
A bone fixing screw template comprising a template body with a cylindrical spacer tube guide cylinder and a detachable cylindrical spacer tube, where the spacer tube has an inner diameter larger than the medical screw, allowing for accurate drilling and continuous screw tightening without template detachment, and can accommodate drills of different diameters with minimal human error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional drilling method is used without a specialized template, then the surgical procedure is simpler, but the positioning accuracy and directional control of screw insertion deteriorate, leading to potential nerve damage
Solution Approach 1:
The template is divided into multiple functional components: a template body with a bore hole for positioning, a cylindrical spacer tube for depth control, and a guide cylinder for directional alignment. Each component serves a specific function, allowing the system to achieve high precision without excessive overall complexity.
Solution Approach 2:
The template and guide cylinders are prepared in advance with pre-determined positions, directions, and depth markings. The cylindrical spacer tube is pre-positioned to establish the exact insertion depth before drilling begins, eliminating the need for complex real-time measurements during surgery.
2Ease of operation
If the bored hole diameter is made large to accommodate the screw, then screw insertion becomes easier, but the drilling process becomes more difficult and requires multiple drilling steps
Solution Approach 1:
The template's bore hole is designed with an optimal diameter that balances drilling ease and screw insertion feasibility. The cylindrical spacer tube's inner diameter is specifically dimensioned to provide sufficient clearance for the screw while maintaining a reasonable drilling diameter, eliminating the need for multi-step drilling processes.
3Measurement precision
If the template is detached after drilling to insert the screw, then the drilling position accuracy is maintained, but the screw insertion direction control deteriorates
Solution Approach 1:
The template body and cylindrical spacer tube are combined into an integrated assembly that remains in place throughout both drilling and screw insertion. The guide cylinder provides continuous directional guidance, ensuring that the screw follows the exact drilling path while the template maintains positioning accuracy.
Solution Approach 2:
The guide cylinder acts as an intermediary structure that connects the template body to the screw insertion path. It provides a physical constraint that ensures the screw is inserted along the predetermined direction while allowing the template to remain attached during the entire procedure.
4Manufacturing precision
If multiple drills of different diameters are used to create the bored hole, then the hole diameter requirements are met, but the alignment between drilling directions becomes difficult and time-consuming
Solution Approach 1:
The template's bore hole and cylindrical spacer tube are designed with optimized diameter parameters that allow a single drill to create both the positioning hole and the final screw insertion hole. This eliminates the need for multiple drilling operations with different diameter drills, saving time while maintaining precision.
Data Source
AI summary
A bone fixing screw template is a combination of: a template body (A) integrally constituted by a fitting section (1), which has an inner surface joining and fitting face-to-face to a three-dimensional-shaped surface of a bone region, and a cylindrical spacer tube guide cylinder (2) protruding while being pointed in a direction coaxial with the direction of insertion of the fitting section and a medical screw; and a cylindrical spacer tube (B) sliding in contact with the inner wall of the cylindrical spacer tube guide cylinder (2), the inner diameter of the cylindrical spacer tube (B) being formed to allow a drill to be slidable in the cylindrical spacer tube (B). By using the template, surgery requiring proficiency in fixing the bone region by tightening medical screws can be performed reliably and easily.