Reciprocating Rasp for Augmented Glenoid Bone Preparation
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Solution Overview
Problem
Current orthopaedic surgical instruments face challenges in efficiently preparing complex bone geometries for augmented glenoid and acetabular components during joint replacement procedures, particularly in cases of erosion due to arthritis, where traditional instruments require multiple tools and frequent interruptions for intraoperative assessment.
Innovation Solution
A reciprocating rasp with a cutting head matching the geometry of the augmented components, allowing for precise and efficient bone preparation with a single instrument, featuring a shaft for power tool integration, teeth for abrasion, alignment members for guide pin alignment, and depth stops for precise depth control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional surgical instruments (reamers, saws, burrs) are used for bone preparation, then the glenoid surface can be prepared, but the procedure requires multiple tools and frequent interruptions for intraoperative assessment
Solution Approach 1:
The patent combines multiple traditional surgical instruments (reamers, saws, burrs) into a single reciprocating rasp instrument. The cutting head integrates cutting surfaces that perform multiple functions - reaming, sawing, and burring - all in one tool, eliminating the need to switch between multiple instruments during the procedure.
Solution Approach 2:
The reciprocating rasp is designed as a universal instrument that can perform multiple bone preparation functions. The cutting head can be configured with different geometries to match various augmented glenoid component backside surfaces, allowing one instrument to handle diverse preparation needs that previously required multiple specialized tools.
2Manufacturing precision
If traditional instruments are used for complex bone geometries, then bone preparation can be performed, but frequent interruptions are required for intraoperative assessment
Solution Approach 1:
The cutting head of the reciprocating rasp is pre-configured with geometries that match the backside surfaces of specific augmented glenoid components. This preliminary matching allows the surgeon to select the appropriate cutting head before surgery and eliminates the need for frequent intraoperative assessments and adjustments, as the instrument is already optimized for the specific component being implanted.
3Productivity
If a single reciprocating rasp is used for bone preparation, then surgical complexity and time are reduced, but the cutting head must match complex component geometries
Solution Approach 1:
The reciprocating rasp instrument is segmented into a handle/shaft portion and a separate cutting head portion. The cutting head can be detached and replaced with different heads having various geometries to match different augmented glenoid components. This segmentation allows the main instrument body to remain simple while the cutting heads handle the geometric complexity.
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
Enables single-step, precise bone preparation for augmented glenoid and acetabular components, reducing surgical complexity and time by allowing efficient creation of the required shapes for secure implantation, thereby facilitating successful joint replacement procedures.
Implementation Method 1
A reciprocating rasp includes a shaft having an end that fits into a reciprocating power tool and a cutting head secured to the other end of the shaft and having a geometry that matches that of the backside surface of an augmented glenoid component or an acetabular augment component. The cutting head of the rasp is covered in teeth. When the cutting head is advanced into the bone tissue of the glenoid or acetabulum with reciprocating motion, the teeth abrade the bone thereby gradually creating the shape required to accept the augmented glenoid or acetabular augment component.
Data Source
AI summary
Reciprocating rasps for the surgical preparation of the bone prior to the implantation of a glenoid or acetabular component with complex geometry are disclosed. Surgical methods for the use of such reciprocating rasps are also disclosed.