Calcar Grinder Abrasive Head for Controlled Bone Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional calcar grinders used in hip joint replacement surgery are aggressive, leading to unpredictable bone removal, potential fractures, and inefficiencies due to clogging from bone and soft tissue debris, which complicates the preparation of the femoral stem implant.
Innovation Solution
A calcar grinder with a cutting head featuring radially and circumferentially spaced recesses, along with secondary teeth and a spiral design, allows for controlled bone removal and efficient debris expulsion, preventing clogging and ensuring a uniform surface preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional calcar grinders with teeth are used to remove bone, then bone removal speed is improved, but bone removal becomes aggressive and unpredictable, potentially causing fractures
Solution Approach 1:
The invention changes the fundamental parameter of the cutting mechanism from tooth-based engagement to abrasive grinding surfaces. The head member features a peripheral surface with abrasive material that grinds bone through friction and abrasion rather than tooth engagement, providing controlled and predictable bone removal while maintaining effective bone removal speed
Solution Approach 2:
The invention replaces the mechanical tooth engagement system with an abrasive grinding system. Instead of discrete teeth that engage and disengage from bone, the continuous abrasive surface provides consistent grinding action, eliminating the aggressive and unpredictable nature of tooth-based bone removal
2Productivity
If conventional calcar grinders with teeth are used to remove bone, then bone removal efficiency is improved, but torque on bone increases significantly, inducing fractures
Solution Approach 1:
The invention changes the cutting mechanism from high-torque tooth engagement to lower-torque abrasive grinding. The abrasive material on the peripheral surface removes bone through friction and abrasion, significantly reducing the torque transmitted to the bone while maintaining efficient bone removal
Solution Approach 2:
The invention substitutes the high-torque mechanical tooth engagement system with a lower-torque abrasive grinding system. The abrasive particles on the peripheral surface grind bone with minimal torque, eliminating the risk of torque-induced fractures while preserving bone removal efficiency
3Productivity
If conventional calcar grinders are used for grinding, then bone removal is achieved, but removed material clogs the grinder teeth, reducing efficiency and control
Solution Approach 1:
The invention extracts the harmful clogging effect by eliminating tooth structures that trap debris. The smooth peripheral surface with abrasive material allows bone dust and removed material to be easily swept away by irrigation fluid and natural clearance, preventing clogging and maintaining consistent grinding efficiency
Solution Approach 2:
The invention replaces the tooth-based mechanical system that generates clogging with an abrasive surface system that resists clogging. The continuous peripheral surface without discrete teeth prevents debris accumulation, maintaining grinding efficiency throughout the procedure
4Productivity
If conventional calcar grinders are used to prepare the calcar, then bone removal is achieved, but the surface uniformity and precision for implant fitment are reduced
Solution Approach 1:
The invention changes the cutting mechanism to produce a more uniform surface. The abrasive grinding action on the peripheral surface creates a consistent, smooth finish on the calcar, improving the precision and uniformity of the prepared surface for optimal implant fitment while maintaining effective bone removal rates
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 provides less aggressive bone removal, reduces the risk of fractures, and maintains tool proximity to the target location, ensuring efficient and precise preparation of the femoral stem and calcar for prosthetic implantation.
Implementation Method 1
The head end includes a cutting head member, the end surface of which has teeth arranged at angles out of the plane of the surface. These teeth engage with bone when the grinder rotates during use. The grinder spins at high revolutions per minute to remove bone
Data Source
AI summary
Apparatus and methods for removing bone and/or tissue at a target location are disclosed. The apparatus comprises a shaft member having a drive end securable to a rotating drive unit, and a cutting head member at a remaining end of the shaft member distal to the drive end.