Bone Anchor Receiving Part With Dual Instrument Engagement
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Solution Overview
Problem
Existing bone anchoring devices lack versatility in accommodating different types of instruments, leading to inefficiencies and increased inventory costs in spinal surgery.
Innovation Solution
A receiving part with a U-shaped recess and circumferential grooves and recesses on its outer surface, allowing interchangeable engagement with multiple instruments, ensuring reproducible attachment and preventing inadvertent detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a receiving part is designed with a single engagement structure for instruments, then the device complexity is reduced, but the adaptability to different instruments is limited
Solution Approach 1:
The receiving part is designed with multiple engagement structures including a groove and a recess, allowing it to accommodate different types of instruments (first instrument engaging the groove, second instrument engaging the recess). This multi-functional design enables a single receiving part to serve multiple purposes and work with various instrument types without requiring separate receiving parts for each instrument type.
2Ease of operation
If different instruments are designed for different engagement structures, then the ease of operation with specific instruments is improved, but the loss of time for instrument changes and inventory management increases
Solution Approach 1:
By integrating multiple engagement structures (groove and recess) into a single receiving part, the design allows surgeons to use different instruments with the same receiving part. This reduces the need to change receiving parts or manage multiple types of receiving parts in inventory, thereby reducing the time lost to instrument changes and inventory management while maintaining ease of operation with each specific instrument type.
3Reliability
If the lower surfaces of groove and recess are at different axial heights, then the manufacturing precision requirements are reduced, but the reliability of reproducible instrument positioning is compromised
Solution Approach 1:
The design specifies that the lower surface of the recess and the lower surface of the groove are positioned at substantially the same axial height on the outer surface of the receiving part. This parameter alignment ensures that when instruments are attached to either the groove or the recess, they achieve a reproducible position relative to the receiving part, maintaining consistent orientation and positioning across different instrument attachments.
4Adaptability or versatility
If only one engagement structure (groove or recess) is provided, then the device complexity is reduced, but the adaptability to different instrument types is limited
Solution Approach 1:
The receiving part incorporates both a groove and a recess as engagement structures. The groove can engage with a first type of instrument while the recess can engage with a second type of instrument. This dual-structure design enables the receiving part to be universally compatible with multiple instrument types, increasing adaptability without requiring separate receiving parts for each instrument type.
Data Source
AI summary
A receiving part of a bone anchoring device has a first end, a second end, and a central axis, a rod recess adjacent to the first end for receiving a rod, the rod recess forming two legs, a groove that extends circumferentially around an outer surface of at least one of the legs, the groove having a downwardly facing upper surface and an upwardly facing lower surface, and a second recess formed on the outer surface of the at least one of the legs that extends radially inwardly closer to the central axis than the groove is to the central axis, the second recess having a downwardly facing upper surface and an upwardly facing lower surface. The groove and the second recess are respectively configured to facilitate engagement by two different instruments to the receiving part.