Premounted Drive Spindle for Bone Anchoring Placement Accuracy
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Solution Overview
Problem
Conventional bone-anchoring instruments experience wear and pairing difficulties during surgical operations, leading to potential faulty placements and increased surgical risks due to recurrent sterilization and multiaxial screw complexities.
Innovation Solution
A premounted driving instrument assembly with a secure drive spindle on the bone-anchoring element, utilizing an intermediate holding part for axial retention and flexible materials to ensure secure coupling and rotation, eliminating wear and pairing issues while maintaining torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional driving instruments are used with bone-anchoring elements, then the instruments can be reused across multiple surgical operations, but they experience wear and pairing difficulties leading to faulty placements
Solution Approach 1:
The drive spindle is pre-assembled with the bone-anchoring element before the surgical operation. This preliminary assembly ensures proper pairing and eliminates wear issues that occur with conventional separate instruments, as the drive spindle and bone-anchoring element form a unified, pre-configured assembly that maintains optimal mechanical connection throughout the procedure.
Solution Approach 2:
The invention employs a disposable drive spindle that is discarded after a single use. This eliminates the need for reusing and maintaining instruments across multiple operations, thereby preventing wear-related failures and pairing difficulties. The disposable nature ensures that each surgical operation receives a fresh, undamaged drive spindle, maximizing placement accuracy.
2Reliability
If driving instruments are subjected to recurrent sterilization cycles, then they can be reused, but the aggressive actions by solvents and decontaminants accelerate wear
Solution Approach 1:
By using a disposable drive spindle, the invention eliminates the instrument entirely from the sterilization process. The disposable nature means the drive spindle is not subjected to recurrent sterilization cycles, avoiding the damaging effects of aggressive solvents and decontaminants that would otherwise accelerate wear and compromise durability.
Solution Approach 2:
The drive spindle is extracted from the reusable instrument category and placed in the disposable category. This extraction removes it from the sterilization process, isolating it from the harmful effects of repeated exposure to sterilization agents, thereby preventing sterilization-induced wear and maintaining integrity.
3Ease of operation
If tolerance is provided at the connection between instrument and bone-anchoring element to overcome pairing difficulties, then pairing is easier, but the connection is frequently lost under bending forces
Solution Approach 1:
The drive spindle is pre-assembled with the bone-anchoring element before surgery, ensuring optimal pairing is achieved automatically. This preliminary configuration eliminates the need for post-assembly adjustments or tolerances, as the components are already precisely aligned. The pre-assembled state maintains strong connection under bending forces while eliminating pairing difficulties during the procedure.
4Reliability
If the drive spindle is premounted on the bone-anchoring element, then wear and pairing issues are eliminated, but the assembly complexity increases
Solution Approach 1:
The drive spindle and bone-anchoring element are merged into a single pre-assembled unit before the surgical operation. This merging eliminates the need for separate assembly steps during surgery, actually reducing operational complexity while improving connection reliability. The unified assembly ensures consistent mechanical connection without the complexity of field assembly or adjustment.
Data Source
AI summary
The invention concerns an implantation assembly comprising a bone-anchoring element comprising a threaded rod provided at one of its ends with a head and an instrument for driving the bone-anchoring element, said instrument comprising a drive spindle removably premounted on the bone-anchoring element.