Portable Bone Grinder with Segmented Sterile Drive
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Solution Overview
Problem
Conventional bone grinding systems are inefficient, prone to contamination, and fail to maintain the osteoinductive properties of bone tissue due to multiple equipment stages, lack of sterile environment protection, and uncontrolled grinding processes.
Innovation Solution
A compact, portable bone grinder with a pneumatic or electrical drive system, featuring a disposable cutter head arrangement and a design that allows for easy cleaning and operation within a sterile environment, using opposite-direction cutter heads to minimize bone loss and contamination, and a detachable unit for collecting ground bone tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional bone grinding systems use multiple separate pieces of equipment for two-stage milling, then bone can be processed into powder form, but the process requires physical transfer between equipment which causes contamination and reduces efficiency
Solution Approach 1:
The patent combines the primary cutting mechanism and secondary grinding mechanism into a single integrated apparatus. The bone sample remains in the same chamber throughout the two-stage process, eliminating the need for physical transfer between separate equipment. This merging resolves the contradiction by maintaining productivity through complete processing capability while eliminating contamination risks associated with transferring bone samples between separate machines.
2Device complexity
If the drive portion of the grinding apparatus is located in close proximity to the dispensing portion, then the device structure is simplified, but the bone sample is at high risk of contamination during operation
Solution Approach 1:
The patent segments the apparatus into distinct sterile and non-sterile zones. The drive mechanism is enclosed in a separate housing that is physically isolated from the sterile grinding chamber. This segmentation allows the drive portion to be structurally integrated while maintaining spatial separation from the bone processing area, thus preserving sterility without excessive structural complexity.
Solution Approach 2:
The patent introduces a sterile barrier or seal as an intermediary between the drive mechanism and the grinding chamber. This intermediary element allows mechanical power transmission while maintaining the sterile environment, resolving the contradiction between structural simplicity and contamination prevention.
3Ease of repair
If maintenance or repair work is performed on the grinding apparatus, then the device can be serviced, but the entire apparatus must be removed from the surgical environment which disrupts the sterile medical facility
Solution Approach 1:
The patent designs the apparatus with modular, separable components where the drive mechanism can be independently accessed and serviced. This segmentation allows maintenance personnel to service the drive portion without removing the entire apparatus from the sterile surgical environment, thus resolving the contradiction between ease of repair and sterile environment maintenance.
4Productivity
If bone is ground into powder using conventional apparatus, then bone tissue powder is produced, but morphogenetic proteins break down due to uncontrolled heat which reduces osteoinductivity
Solution Approach 1:
The patent employs controlled intermittent grinding cycles with periodic pauses for cooling. This periodic action allows heat dissipation between grinding intervals, preventing excessive temperature buildup that would degrade morphogenetic proteins. The controlled cycling maintains productivity while preserving osteoinductivity through temperature management.
Solution Approach 2:
The patent implements precise control of grinding parameters including speed, pressure, and duration to optimize the balance between efficient bone powder production and heat generation. By adjusting these parameters, the system achieves productive grinding while maintaining temperatures that preserve morphogenetic protein integrity and osteoinductivity.
Data Source
AI summary
A bone grinder utilizing a removable cutter head unit for maintaining the processing of bone and for substantially precluding the main body of the bone grinder from being exposed to bone tissue.