Oscillating Rasp for Vertebral Endplate Cavity Preparation
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Solution Overview
Problem
Current milling instrumentation for vertebral endplates lacks precision in forming cavities, leading to potential expulsion of spinal implants and risk of damaging vital tissues during surgery.
Innovation Solution
The development of an oscillating rasp with a rotary power source and linkage assembly for precise cavity preparation, along with a central reamer for creating kidney-shaped grooves, enables precise control and minimizes tissue damage by converting rotary motion into reciprocating motion for precise cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If typical milling instrumentation is used to prepare vertebral endplates, then the procedure is simple to perform, but the precision of cavity formation is insufficient leading to potential implant expulsion
Solution Approach 1:
The milling equipment incorporates dynamic control mechanisms that allow real-time adjustment of cutting parameters and tool positioning during the procedure, enabling precise cavity formation while maintaining operational simplicity through automated feedback control
Solution Approach 2:
The patent replaces traditional mechanical milling systems with a guided oscillating rasp system that uses controlled reciprocating motion and computer-guided positioning to achieve superior precision without requiring complex manual operation or force application by the surgeon
2Ease of operation
If force is applied to counteract milling forces, then control over the milling equipment is improved, but the complexity of the procedure increases and tissue damage risk remains
Solution Approach 1:
The patent replaces the need for manual force application with a self-contained oscillating rasp system driven by an integrated motor that automatically generates and controls the cutting forces, eliminating the need for surgeon force application and reducing tissue damage risk through precise force control
Solution Approach 2:
The milling equipment incorporates feedback mechanisms that monitor cutting forces and tool positioning in real-time, automatically adjusting parameters to maintain safe operating conditions and prevent damage to vital tissues without requiring manual intervention
3Manufacturing precision
If traditional milling equipment is used, then the device structure is simple, but the ability to form precise cavities at desired locations is insufficient
Solution Approach 1:
The patent replaces traditional mechanical milling equipment with an oscillating rasp system that uses controlled reciprocating motion and integrated guidance mechanisms to achieve precise cavity formation at desired locations through automated positioning rather than manual control
Solution Approach 2:
The milling equipment is divided into modular components including the oscillating rasp, guide mechanisms, and positioning systems that can be independently adjusted and controlled, enabling precise cavity formation while maintaining overall system manageability
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 allows for precise cavity formation in vertebral endplates, reducing the risk of implant expulsion and tissue damage, while enabling precise control during surgery, thus enhancing the stability and safety of spinal implantation.
Implementation Method 1
a linkage assembly coupled to the rotary power source, which converts rotary motion of the rotary power source into a reciprocating motion
Implementation Method 2
a cutting element adapted to cut a cavity into the vertebral endplates
Implementation Method 3
rasping a generally flat surface on an endplate of a vertebrae with a rasp having a pair of bilateral rasp plates linearly reciprocating in opposite directions
Data Source
AI summary
A disc preparation system includes an oscillating rasp for preparation of vertebral endplates and a central reamer for reaming a pair of kidney-shaped grooves into the vertebral endplate. The oscillating rasp is powered by a rotary power source. A linkage assembly is coupled to the rotary power source to convert the rotary motion into a reciprocating motion. A pair of rasps plates, which are linked to the linkage assembly, linearly reciprocate in opposite directions in response to the reciprocating motion of the linkage assembly. In one form, the central reamer includes a pair of cutting elements that are coupled to the rotary power source in order to rotate in response to rotational movement from the rotary power source. In another form, the central reamer includes a single cutting element coupled to an angled reamer handle and a reamer guide.