Bone Mill Anti-Binding Dead-Stop Mechanism
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Solution Overview
Problem
Existing bone milling devices for dental implant procedures face challenges in efficiently milling harvested bone without the grinding surfaces adhering to each other, leading to difficulties in separating and retrieving milled bone.
Innovation Solution
A bone mill device with a unique design featuring a parabolic leaf spring or coil spring mechanism to keep the jaws separated, along with a rotatable and stationary mill assembly with grinding teeth arrays and dead-stops to prevent adhesion, allowing for effective bone milling and easy retrieval of milled bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grinding surfaces are pressed together to mill bone, then milling effectiveness is improved, but grinding surfaces bind to each other
Solution Approach 1:
The grinding surfaces are segmented into discrete grinding teeth arranged in arrays, with interstices between adjacent teeth. This segmentation allows milled bone to be retained in the interstices rather than causing continuous surface binding, resolving the contradiction between effective grinding contact and surface separation.
Solution Approach 2:
Dead-stops are introduced as intermediary elements that contact between the opposing grinding surfaces. These dead-stops prevent the grinding surfaces from binding to each other by providing a mechanical stop, while still allowing the grinding teeth to effectively mill bone through the interstices.
2Strength
If grinding teeth are forced together to compact milled bone, then bone compaction is improved, but grinding surfaces bind
Solution Approach 1:
The function of bone compaction is extracted from the grinding surfaces themselves and transferred to dedicated dead-stops. The dead-stops are specifically designed to contact and compact milled bone in the interstices without causing the grinding surfaces to bind, separating the compaction function from the grinding function.
Solution Approach 2:
Dead-stops serve as intermediary elements between the grinding surfaces, performing the dual function of preventing surface binding and compacting milled bone. They mediate the interaction between opposing grinding surfaces, allowing compaction without direct surface contact that would cause binding.
3Reliability
If grinding surfaces are kept separated to prevent binding, then surface separation is improved, but milling efficiency decreases
Solution Approach 1:
By segmenting the grinding surfaces into discrete teeth with interstices, the system allows grinding contact at multiple points (teeth) while maintaining overall surface separation through the interstices. This segmentation enables both efficient milling through tooth contact and prevention of binding through gap maintenance.
Solution Approach 2:
Dead-stops act as intermediaries that enable grinding surfaces to remain separated while still achieving effective milling. They provide the necessary mechanical stop to prevent binding, allowing the grinding teeth to work effectively in the interstices without requiring continuous surface contact.
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 device enables reliable and efficient milling of bone without the grinding surfaces adhering, facilitating easier separation and retrieval of milled bone, enhancing the bone grafting process for dental implants.
Implementation Method 1
A bone mill device includes a parabolic leaf spring or coil spring mechanism to keep the jaws separated
Implementation Method 2
milling a patient's bone that was extracted during a previous procedure
Implementation Method 3
the grinding teeth from each of the grinding surfaces forcefully compact the accumulation of milled bone further into the interstices
Data Source
AI summary
A bone milling device for grinding bone during a bone grafting procedure including a pair of opposing dead stops, one or more provided on a rotating plate of a rotatable mill and one or more provided on a stationary plate to prevent adhesion of respective arrays of grinding teeth.