Tibia Alignment Fixing Device with Oblique Anchor Pin
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Solution Overview
Problem
Existing tibia alignment systems face challenges in safe and easy handling during attachment and removal of fixation pins, particularly the risk of pin length causing vascular injuries and the difficulty in releasing the saw guide without displacing the crossbar, leading to potential damage during knee surgery.
Innovation Solution
A fixation device with an obliquely positioned anchor pin system integrated with an impaction anvil and a lever mechanism that allows for controlled pin insertion and removal without displacing the main rod, ensuring safe and easy handling by preventing direct force transmission to the bone and minimizing the risk of injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw-in pins are used for knee-side fixation, then the fixation can be achieved with predetermined length pins, but there is a risk of using pins that are too long which can injure blood vessels when driven into the tibia
Solution Approach 1:
The fixing device is divided into separate components: a crossbar that remains outside the tibia and anchor pins that are driven into the tibia. The crossbar with protruding pins acts as one segment that can be controlled for length, while the actual penetrating pins are separate and can be precisely controlled in length to avoid vascular injury.
Solution Approach 2:
The crossbar serves as an intermediary component between the external fixation system and the tibia. Instead of driving long pins directly into the tibia from the external system, the crossbar with its protruding pins acts as a mediator that transfers the fixation function while allowing precise control over the length of pins that actually contact the bone.
2Ease of operation
If the crossbar with protruding pins is driven into the tibia, then fixation is achieved, but the connection of the saw guide to the main rod must be released to avoid pulling the saw guide when removing the crossbar
Solution Approach 1:
The fixation system is segmented into the crossbar assembly and the main rod with saw guide. The crossbar can be independently removed by pulling it outward, while the main rod remains stationary. This segmentation allows the crossbar to be detached without affecting the saw guide connection to the main rod.
Solution Approach 2:
The crossbar is extracted as a separate removable component from the fixation system. By designing the crossbar to be independently removable through outward pulling, the system allows removal of the crossbar without needing to release the saw guide connection to the main rod, simplifying the overall removal process.
3Ease of operation
If the entire crossbar with integrated pins is levered against the bone for removal, then the pins can be pulled out, but the connection of the saw guide to the main rod must be released which is disadvantageous
Solution Approach 1:
The crossbar is extracted as a separate removable component by pulling it outward. This extraction method allows removal of the pins without needing to lever the entire crossbar against the bone, thereby avoiding mechanical trauma to the tibia and eliminating the need to release the saw guide connection.
Solution Approach 2:
Instead of levering the crossbar against the bone to remove pins (which causes trauma), the method is inverted: the crossbar is simply pulled outward in the opposite direction, allowing pins to be removed without contact force applied to the bone surface.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a fixing device (1) for a tibia alignment system for knee operations, comprising a transverse bar (2), the front end (3) of which can be connected to a main rod (H) of the tibia alignment system, said main rod being provided for an alignment along the tibia, and a rear end of which has an anchor system (5) with at least one anchor pin (6) that runs diagonally to the transverse bar (2) and can be driven into a knee joint-side end of the tibia. The anchor system (5) has a drive-in anvil (7), into which the at least one anchor pin (6) is integrated and which is designed to transmit impact forces acting on the anvil from the outside to the at least one anchor pin (6) in order to drive same into the tibia, said anchor pin (6) and drive-in anvil (7) being guided in the transverse bar (2) in a longitudinally movable manner for this purpose.