Segmented Cement Extraction Rod for Bone Cavity Debridement
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Solution Overview
Problem
Current methods for removing hardened cement from bone cavities are cumbersome, require specialized skills, pose risks to bone health, are costly, and often leave residual cement, necessitating additional invasive procedures.
Innovation Solution
An elongated body with rigid elements and spacer elements, designed to be inserted into the cement-filled cavity, which adheres to the hardened cement and allows for sequential extraction using a threaded rod, minimizing manual effort and risk while accommodating the cavity shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ultrasound instrument with spoon-shaped electrode is used to soften and remove hardened cement, then cement removal is enabled, but the operation becomes arduous and requires highly specialized personnel
Solution Approach 1:
The extraction rod is divided into multiple sections that can be connected or disconnected. This segmentation allows the operator to manipulate shorter sections individually within the confined bone cavity, reducing the complexity of handling a single long instrument while still achieving complete cement extraction through sequential removal of cement portions.
2Object-affected harmful factors
If ultrasound warming electrode is used near bone cavity walls, then cement softening is achieved, but risk of overheating and damaging bone increases
Solution Approach 1:
Instead of applying heat to the bone cavity environment, this invention extracts cement portions mechanically using the segmented extraction rod. By taking out cement sections sequentially rather than attempting to soften and remove them en masse through heating, the method eliminates thermal damage risk while maintaining effective cement removal productivity.
3Object-affected harmful factors
If considerable extraction force is applied to remove all hardened cement in one go, then complete cement removal is achieved, but risk of overstressing the bone increases
Solution Approach 1:
The extraction process is segmented into multiple stages corresponding to different sections of the extraction rod. Each section removes a portion of cement with moderate force, avoiding the need to apply excessive force to remove all cement at once. This maintains productivity by systematically progressing through cement removal while protecting the bone from overstress.
4Object-affected harmful factors
If threaded rod with nuts is used for sequential cement extraction, then bone stress is reduced, but manual preparation work increases significantly
Solution Approach 1:
The extraction rod sections are designed to be self-contained units that can be easily connected and disconnected without requiring complex preparation. Each section independently engages with cement and can be removed separately, eliminating the need for extensive manual assembly of multiple components like nuts and threaded sections. This simplifies device preparation while maintaining the benefit of reduced bone stress through sequential extraction.
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 safe, efficient, and cost-effective removal of hardened cement from bone cavities with reduced risk of bone damage and residual cement, facilitating easier distal plug removal through improved design and sequential extraction.
Implementation Method 1
injecting a liquid mass of fresh cement inside the bone cavity directly in contact with the layer of hardened cement left after the prosthesis has been extracted
Data Source
AI summary
The equipment for removing cement from bone cavities consists of an elongated body, hollow inside, that can be inserted inside a cement-filled bone cavity, and at least one rod for extracting the elongated body buried in the cement, that can be inserted inside the elongated body. The elongated body comprises a plurality of rigid elements aligned with each other and associated to one another by the interposition of spacer elements, tubular in shape and coaxial to the elongated body, the rigid elements including removable means for connecting to the extraction rod which are arranged inside the elongated body.