Angled Craniotome and Minimal Plating for Cosmesis
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Solution Overview
Problem
Current craniotomy procedures and devices face challenges when making angled cuts, leading to tissue damage and cosmetic issues, and traditional plating systems cause discomfort, infection risks, and unnecessary scarring due to their complexity and hardware requirements.
Innovation Solution
A surgical device with an elongate handle, obliquely positioned stem, and footplate allows for angled cuts in craniotomies, minimizing tissue contact and using a minimal plating system with fewer components to reduce cosmetic defects and patient discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a perpendicular cut is made through the skull, then the footplate can protect underlying tissue, but the bone flap becomes recessed and contacts underlying tissue causing damage
Solution Approach 1:
The cutting bit is positioned at an oblique angle (e.g., 30-60 degrees) relative to the footplate axis, creating an asymmetric cut geometry. This angled cut prevents the bone flap from becoming recessed and contacting underlying tissue, while the footplate remains positioned to protect underlying structures during the cutting process.
Solution Approach 2:
The invention transitions from a perpendicular cutting approach to an angled cutting approach by positioning the cutting bit at an oblique angle relative to the footplate. This dimensional change in cutting angle eliminates the problem of bone flap recession while maintaining tissue protection through proper footplate positioning.
2Shape
If angled cuts are made with traditional craniotomes, then cosmetic appearance may be improved, but underlying tissue contacts the cutting bit causing damage
Solution Approach 1:
The footplate serves as an intermediary protective element that is positioned to contact or closely approach the inner skull surface during angled cutting. This intermediary structure shields underlying tissue from direct contact with the cutting bit, enabling angled cuts for cosmetic improvement without causing tissue damage.
Solution Approach 2:
The footplate is positioned in advance to protect underlying tissue before the cutting bit makes contact with the skull at an angled orientation. This preliminary positioning ensures that even during angled cuts, the protective barrier is in place to prevent tissue damage.
3Strength
If traditional plating systems are used to reattach the bone flap, then structural integrity is achieved, but cosmetic defects occur due to visible raised skin
Solution Approach 1:
The invention removes the traditional titanium plate and multiple screw components from the reattachment system. Instead, a single screw is used to secure the bone flap, extracting the unnecessary hardware that caused cosmetic defects while maintaining sufficient structural integrity for bone flap reattachment.
Solution Approach 2:
The invention replaces permanent, complex titanium plating systems with a simpler, minimal hardware approach using a single screw. This simplified system achieves the necessary function temporarily without the long-term cosmetic issues associated with traditional plates, aligning with the principle of using simpler, less intrusive solutions.
4Reliability
If traditional plating systems with multiple components are used, then secure fixation is achieved, but the number of components increases complexity and surgical time
Solution Approach 1:
The invention merges multiple separate components (titanium plate, multiple screws, washers) into a single integrated screw component. This consolidation maintains secure fixation functionality while dramatically reducing the number of parts that need to be handled, assembled, and removed, thereby reducing surgical complexity and time.
Solution Approach 2:
The single screw component performs multiple functions that traditionally required separate elements: it provides fixation, structural support, and secure attachment in one element. This multi-functional approach eliminates the need for separate plates and multiple screws while maintaining reliable bone flap reattachment.
5Reliability
If traditional plating systems are used, then bone flap reattachment is achieved, but patient discomfort and infection risk increase
Solution Approach 1:
The invention extracts unnecessary hardware components from the traditional plating system, removing the titanium plate and associated components that created skin erosion, infection risks, and patient discomfort. The minimal single-screw approach maintains reattachment reliability while eliminating sources of harm.
Solution Approach 2:
The invention converts the harmful effect of extensive hardware into a benefit by using minimal hardware. The single screw provides sufficient fixation while eliminating the skin erosion, infection risks, and discomfort caused by traditional extensive plating systems, effectively using less hardware to achieve better outcomes.
Data Source
AI summary
In accordance with one embodiment, a device for performing an angled craniotome includes an elongate handle, a footplate, a stem, and an elongate cutting bit. The elongate handle extends in a vertical direction. The footplate is spaced apart from the elongate handle and defines a plane generally perpendicular to the vertical direction. The footplate is offset from the handle in a horizontal direction where the horizontal direction is perpendicular to the vertical direction. The stem has a proximal end and a distal end. The proximal end is coupled to the handle and the distal end is coupled to the footplate. The stem extends from the handle at an oblique angle in the horizontal direction relative to the handle. The elongate cutting bit is coupled to the handle and extends from the handle toward the footplate at the oblique angle in the horizontal direction relative to the handle.