Radiolucent Orthopedic Insertion Handle and Aiming Guide
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Solution Overview
Problem
Existing orthopedic implant insertion tools are radio-transparent, causing X-ray scattering that compromises the clarity of the operative site, making surgical procedures longer and more difficult due to radiation interference.
Innovation Solution
A radiolucent orthopedic implant insertion handle and aiming guide made from materials like steel or titanium, with a thin-walled, hollow carbon fiber guide arm that reduces radiation scattering, featuring a coupling and threaded nut for precise alignment and connection, allowing for accurate placement of fixation elements like screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing targeting devices are made radio-transparent, then they allow X-ray visualization of the operative site, but they cause X-ray scattering that compromises the clarity of the fluoroscopic image
Solution Approach 1:
The guide arm is constructed with thin-walled hollow structure where the wall thickness is specifically designed to be less than 3mm, preferably less than 2mm, and most preferably less than 1mm. This thin-walled design allows the guide arm to be radiolucent enough for clear fluoroscopic visualization while maintaining sufficient structural strength for surgical guidance functions.
Solution Approach 2:
The guide arm is made from carbon fiber reinforced polymer composite material. Carbon fiber provides the necessary mechanical strength and rigidity for surgical guidance, while the polymer matrix and thin-walled construction ensure radiolucency for clear X-ray imaging. This composite approach allows simultaneous achievement of structural integrity and radiation transparency.
2Strength
If the guide arm wall thickness is increased to improve structural strength, then the device can better support surgical loads, but radiation scattering increases and fluoroscopic clarity decreases
Solution Approach 1:
The guide arm employs a thin-walled hollow tube structure where the wall thickness is optimized to be less than 3mm, preferably less than 2mm, and most preferably less than 1mm. This thin-walled design minimizes radiation scattering for clear fluoroscopic imaging while the hollow tube geometry and carbon fiber composite material provide sufficient structural strength for surgical guidance applications.
Solution Approach 2:
Carbon fiber reinforced polymer composite material is used to construct the thin-walled guide arm. The high strength-to-density ratio of carbon fiber allows the wall thickness to be reduced for radiolucency while maintaining the structural strength necessary to support surgical loads and guide fixation elements accurately.
3Measurement precision
If the guide arm is made thicker to improve alignment precision, then positioning accuracy improves, but radiation scattering increases and procedural complexity increases
Solution Approach 1:
The guide arm utilizes a thin-walled hollow structure with wall thickness less than 3mm, preferably less than 2mm, and most preferably less than 1mm. This design achieves radiolucency for clear fluoroscopic visualization while the precise geometric configuration of the thin-walled tube provides sufficient alignment precision for accurate positioning of fixation elements.
Solution Approach 2:
The guide arm features varying wall thickness along its length, with the distal portion having thinner walls for radiolucency and the proximal portion having slightly thicker walls for connection to the insertion handle. This local variation optimizes both radiolucency and structural requirements at different locations of the device.
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 solution enhances surgical accuracy by minimizing radiation interference, facilitating precise alignment and insertion of orthopedic implants, thereby reducing procedural complexity and duration.
Implementation Method 1
X-ray scattering compromises accuracy by detracting from the clarity of the operative site
Data Source
AI summary
An orthopaedic implant insertion instrument including an insertion handle and a radiolucent aiming guide and method of using same. The insertion handle may be formed of steel and is used for inserting an orthopaedic implant, such as an intramedullary nail or bone plate, into a patient. The radiolucent aiming guide is used to properly locate and guide a drill and/or other insertion instruments for installing fixation elements, such as screws, pins, nails, bolts, blades, etc., through the orthopaedic implant and into the affected bone to secure the implant in position and facilitate healing. The aiming guide is substantially hollow and tubular and is preferably formed of a carbon fiber material.