Oscillating Surgical Rasp for Augmented Glenoid Preparation
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Solution Overview
Problem
Conventional surgical instruments are inadequate for preparing the complex geometry of augmented glenoid components during orthopaedic joint replacement procedures, requiring frequent interruptions and multiple tools for precise bone preparation.
Innovation Solution
An oscillating surgical rasp with a cutting head configured to match the geometry of augmented glenoid components, featuring a cutting surface with angled cutting teeth and a depth stop, secured to an oscillating tool, and a rasp guide with an anchor peg and anchoring pins for secure attachment to the glenoid, allowing for efficient bone abrading and cavity creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional surgical instruments (reamers, saws, burrs) are used for glenoid preparation, then the procedure can be performed with traditional glenoid components, but the preparation becomes extremely difficult and requires frequent interruptions when augmented glenoid components with complex geometry are needed
Solution Approach 1:
The patent combines multiple surgical functions (reaming, cutting, shaping) into a single oscillating rasp instrument. The rasp integrates a cutting head with multiple cutting surfaces and teeth configurations that can perform various bone preparation tasks, eliminating the need to switch between multiple separate tools like reamers, saws, and burrs when preparing for augmented glenoid components.
Solution Approach 2:
The oscillating rasp is designed as a universal instrument capable of preparing glenoid surfaces for both traditional and augmented glenoid components. By adjusting the oscillation parameters and using different rasp configurations, the same instrument can adapt to various component geometries, providing multi-functionality across different surgical scenarios.
2Productivity
If a combination of reamers, saws, and burrs is used for free-hand technique, then traditional glenoid components can be implanted, but frequent interruptions for intraoperative assessment are required
Solution Approach 1:
The oscillating rasp enables continuous bone preparation without the need to switch between different tools or pause for intraoperative assessment. The instrument maintains continuous oscillating contact with the bone, allowing the surgical procedure to proceed without interruptions, thereby improving productivity and reducing time loss.
Solution Approach 2:
The rasp is designed with pre-configured cutting surfaces and geometries that correspond to the final desired glenoid shape. This preliminary configuration allows the surgeon to prepare the bone in one continuous action rather than requiring multiple stopping points for assessment and tool changes.
3Manufacturing precision
If simple reamers are used for glenoid preparation, then the procedure is straightforward with traditional components, but they are inadequate for preparing complex geometry of augmented glenoid components
Solution Approach 1:
The oscillating rasp features different cutting surfaces and tooth configurations on different parts of the instrument, each optimized for specific preparation tasks. The cutting head includes various surfaces with different geometries that correspond to specific regions of the augmented glenoid component, providing locally optimized cutting action for precise preparation of complex geometries.
Solution Approach 2:
The rasp utilizes oscillating motion rather than simple rotation, creating dynamic cutting action that adapts to complex bone geometries. The oscillation allows the cutting surfaces to engage and disengage from the bone in a controlled manner, enabling precise preparation of augmented component geometries while maintaining ease of operation through a single instrument.
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
Facilitates precise and efficient surgical preparation of the glenoid surface for augmented glenoid components, reducing procedural complexity and improving implantation accuracy by mimicking the component's geometry and providing stable fixation.
Implementation Method 1
The cutting surface has a plurality of cutting teeth arranged in a geometry that, when oscillated along a predetermined path in contact with the glenoid of the patient, corresponds with the geometry of the augmented glenoid prosthesis
Data Source
AI summary
An oscillating surgical rasp for use in the surgical preparation of a glenoid of a patient prior to implantation of an augmented glenoid prosthesis comprises an attachment head and a cutting head secured to the attachment head. The attachment head has a body that extends along a longitudinal axis from a first end configured to be secured in a chuck of an oscillating tool to a second end secured to the cutting head. The first end of the body of the attachment head defines an axis of oscillation that extends orthogonal to the longitudinal axis of the oscillating surgical rasp. Surgical methods for the use of such oscillating rasps are also disclosed.