Phalanx Fracture Guide Device for K-Wire Fixation
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Solution Overview
Problem
Distal phalanx fractures pose challenges in k-wire fixation due to slippage risks, especially with angled insertions, which can injure surrounding tissue and fail to achieve proper bone fixation.
Innovation Solution
A multi-part k-wire guide device with a proximal part and a distal part, featuring a pin guide and inflatable cushions for centering and stabilizing the phalange, ensures accurate k-wire insertion and fixation by providing a friction fit and alignment with the phalange's anterior-posterior and lateral axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a k-wire is inserted through the distal phalange to perform fixation, then bone fixation is achieved, but slippage of the k-wire may occur due to the rounded tip of the distal phalange, injuring surrounding tissue and failing to achieve proper fixation
Solution Approach 1:
A guide device is introduced as an intermediary tool between the k-wire and the distal phalange. The guide device includes a guide channel that directs the k-wire along a predetermined safe trajectory, preventing slippage in dorsal, lateral, or palmar directions. This intermediary structure ensures the k-wire reaches the bone securely without deviating and injuring surrounding tissues.
Solution Approach 2:
The guide device is inserted and positioned in the distal phalange before the k-wire insertion. This preliminary positioning establishes a secure pathway and alignment structure that prevents slippage during the subsequent k-wire insertion process, ensuring the rounded tip of the distal phalange does not cause the k-wire to deviate from the intended trajectory.
2Object-affected harmful factors
If a hypodermic needle or drill guide is used to ensure proper insertion, then slippage is prevented, but the k-wire may be inserted at an angle to the axis of the phalanx, which is undesirable for fixation
Solution Approach 1:
The guide device features a guide channel with specific geometric characteristics - a longitudinal axis that is substantially parallel to the longitudinal axis of the phalange. This localized structural design ensures that the k-wire is constrained to follow a precise trajectory that is aligned with the phalange axis, preventing both slippage and angular insertion. The guide channel's cross-sectional shape and orientation provide localized control over the insertion path.
3Ease of operation
If the guide device is removed before a second k-wire is inserted, then the first k-wire can be placed, but the second k-wire may slip and be placed along the wrong track
Solution Approach 1:
The guide device is designed to remain in place during the insertion of multiple k-wires, providing continuous guidance. Rather than removing the guide after the first wire, it is retained to ensure the second wire follows the same correct trajectory. The guide device is subsequently removed only after all necessary k-wires are properly positioned, ensuring consistent alignment throughout the procedure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The guide device effectively prevents k-wire slippage and ensures proper alignment, enhancing the stability of bone fixation and facilitating successful fracture reduction and repair by maintaining the k-wire's position across the fracture site.
Implementation Method 1
providing a friction fit and alignment with the phalange's anterior-posterior and lateral axes
Data Source
AI summary
A guide device for an orthopedic surgery on a phalange includes a distal part having a pin guide is provided. The distal part includes a first opening having a first diameter at a proximal end for inserting at least a portion of a phalange into a tubular section of the distal part, and a second opening at a distal end. The pin guide is connected to the distal end, having a first length which is shorter than a length of a k-wire inserted into the phalange, and a second diameter which is greater than a diameter of the k-wire, and less than the first diameter. In certain embodiments the guide device further includes a proximal part having an aperture for inserting the phalange and a plurality of fasteners, for fastening the proximal part to the distal part.