Bone Grinder Intermediate Zone Sloping Walls
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Solution Overview
Problem
Current bone grinding devices face inefficiencies in milling operations, contamination risks, and heat-related degradation of osteoinductivity, leading to suboptimal conversion of bone into usable particulate form for medical applications.
Innovation Solution
A bone grinder design featuring an intermediate zone with sloping walls to reduce 'bone swirling', rakes with alternating teeth to automate the removal of stuck particulate, and a push platform to control the engagement of cutting elements, ensuring efficient milling and minimizing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a two-stage milling operation is used to convert bone into bone particulate, then the bone can be processed into usable form, but the operation requires multiple pieces of equipment and manual transfer, reducing efficiency and automation
Solution Approach 1:
The patent combines primary and secondary cutting elements into a single integrated bone grinding device. The primary cutting element performs initial bone reduction while the secondary cutting element refines the bone into particulate form, eliminating the need for separate equipment and manual transfer operations. This merging of functions directly resolves the technical contradiction by reducing device complexity while maintaining or improving productivity.
2Device complexity
If the motor or drive mechanism is positioned close to the discharge path for compact design, then the device structure is simplified, but the bone particulate may be contaminated by air or particulate matter from the motor
Solution Approach 1:
The patent separates the motor from the discharge path by positioning it in close proximity to the primary cutting element instead. This extraction of the motor from the contamination-prone discharge area eliminates the harmful factor of particulate contamination while maintaining device structural simplicity. The motor remains integrated into the overall compact design but is relocated to a position that does not compromise sterility.
3Ease of operation
If the cutting elements continuously operate to maintain readiness, then the device is always prepared for milling, but heat is generated that can degrade osteoinductivity of the bone
Solution Approach 1:
The patent implements periodic operation where the cutting elements are activated only when bone is present in the grinding chamber and deactivated when the chamber is empty or during transfer operations. This periodic action pattern maintains device readiness by quickly starting when needed while preventing unnecessary continuous operation that would generate harmful heat and degrade osteoinductivity of the bone particulate.
4Ease of manufacture
If the bone is transferred between multiple equipment pieces for processing, then each stage can be optimized separately, but the transfer process introduces contamination risks and interruptions
Solution Approach 1:
The patent merges primary and secondary cutting operations into a single continuous processing chamber where bone is converted directly from raw material to particulate form without intermediate transfer. This eliminates contamination risks and interruptions associated with manual transfer between equipment pieces while maintaining the ability to optimize each cutting stage separately through independently positioned cutting elements with different configurations.
Data Source
AI summary
A bone grinder may have a grinding chamber, an intermediate zone, and a primary cutting element and a secondary cutting element. The intermediate zone may have a first wall and a second wall within the grinding chamber, and the intermediate zone may separate the primary cutting element from the secondary cutting element. The first wall and the second wall may slope inward such that a distance between the first wall and the second wall generally decreases from the primary cutting element to the secondary cutting element. The primary cutting element and the secondary cutting element may be positioned within the grinding chamber to sequentially perform primary cutting operations and secondary cutting operations on a bone. A drive mechanism may operatively engage the primary cutting element and the secondary cutting element.