Calcar Plane Guide for Precise Bone Removal
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Solution Overview
Problem
Current methods for removing excess bone during S-ROM hip system surgeries risk damaging the sleeve trial and lead to bony impingement, with existing tools like osteotomes and saws causing metal shavings and illegible markings, complicating the achievement of optimal leg length and reducing precision.
Innovation Solution
A calcar plane connected to a rotary hand device with a guide and calcar reamer, allowing precise removal of excess bone superior to the S-ROM sleeve trial, avoiding damage to the trial surface and reducing the risk of bony impingement through a kit that includes a trial, fixture, and calcar reamer with features for guiding and controlling the cutting depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an osteotome or saw is used to remove excess bone, then the excess bone can be removed, but the sleeve trial surface is damaged and metal shavings are released
Solution Approach 1:
The patent introduces a calcar reamer as an intermediary tool between the surgeon and the excess bone. The reamer engages with the calcar bone through a guide mechanism, allowing controlled bone removal without direct contact between traditional osteotomes/saws and the sleeve trial surface. This intermediary approach enables effective bone removal while protecting the trial surface from damage and metal shattering.
Solution Approach 2:
The patent replaces the traditional mechanical osteotome and saw system with a rotary calcar reamer system. Instead of using manual osteotomes that scrape and damage surfaces or saws that generate metal shavings, the invention employs a rotary cutting mechanism guided by a precision guide, substituting the mechanical action to achieve cleaner, more controlled bone removal that protects the trial surface.
2Measurement precision
If the sleeve trial is positioned distally to obtain optimum leg length, then leg length is optimized, but excess bone superior to the sleeve top edge causes bony impingement
Solution Approach 1:
The patent applies preliminary action by removing the excess calcar bone before the final implant is installed. The calcar reamer is used to ream out the excess bone superior to the sleeve trial while the trial is still in place, preparing the bone bed in advance. This preliminary bone removal eliminates the risk of bony impingement before the final prosthesis is positioned, allowing the sleeve to be positioned distally for optimum leg length without causing impingement.
3Object-generated harmful factors
If the top surface of the sleeve trial is scraped or defaced to remove metal shavings, then metal shavings are removed, but the size etchings become illegible
Solution Approach 1:
The calcar reamer with its guide mechanism serves as an intermediary that removes excess bone without requiring direct scraping of the sleeve trial surface. The guide system allows the reamer to engage with the calcar bone through a controlled path, eliminating the need to scrape the trial surface to remove metal shavings, thereby preserving the legibility of size etchings on the sleeve trial.
Data Source
AI summary
A kit for removing calcar bone from a resected face around a bone canal of a long bone prepared to receive an orthopaedic implant is provided. The kit includes a trial for insertion into the bone canal of the long bone and a fixture. The fixture has a connector for connecting the fixture to the trial and a guide for guiding the calcar reamer. The kit also includes a calcar reamer for removing calcar bone from the resected face around the bone canal of the long bone. The reamer includes a feature for cooperation with the guide of the fixture. The kit further includes an implant for insertion into the bone canal of the long bone.