Bone Cutting Apparatus with Mechanical Advantage
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Solution Overview
Problem
Current methods for cryopreserving bone marrow face challenges in rapidly warming large volumes of bone, which is essential for recovering live cells after cryopreservation, as slow cooling rates are easier to manage but rapid warming is problematic.
Innovation Solution
A bone cutting apparatus that allows for the manual cutting of whole bones into smaller pieces for rapid thawing, utilizing a linkage or rack and pinion mechanism to provide mechanical advantage and leverage for cutting through bone with minimal effort, enabling efficient processing and cryopreservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If whole bone is cryopreserved, then cryopreservation effectiveness is improved, but rapid warming capability deteriorates
Solution Approach 1:
The apparatus divides the whole bone into multiple smaller segments or fragments through cutting. This segmentation allows the bone pieces to be rapidly warmed in subsequent processing, solving the contradiction between maintaining cryopreservation effectiveness of whole bone and achieving rapid warming rates necessary for live cell recovery.
2Force
If manual cutting force is applied directly to bone, then cutting capability deteriorates, but device complexity increases with mechanical advantage mechanisms
Solution Approach 1:
The apparatus introduces a mechanical advantage mechanism (linkage or rack and pinion) as an intermediary between the user's manual force and the cutting element. This intermediary multiplies the applied force to achieve sufficient cutting force while keeping the overall device relatively simple in design.
3Speed
If bone is cut into smaller pieces, then rapid thawing capability is improved, but processing time increases
Solution Approach 1:
By cutting the bone into smaller segments, the apparatus increases the surface area to volume ratio of each piece, enabling much faster thawing rates. Although this requires an additional cutting step, the overall process time is reduced because rapid thawing of small pieces is significantly faster than attempting to thaw large volumes of whole bone.
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 effective cryopreservation and subsequent rapid thawing of bone marrow, facilitating the recovery of live cells by allowing for the quick warming of bone fragments, thus overcoming the limitations of slow warming rates in whole bone cryopreservation.
Implementation Method 1
A frame supports the upper cutting element above the lower cutting element for movement toward and away from the lower cutting element. The apparatus is provided with a manually operable handle and a force transmission mechanism connecting the handle to the upper cutting element to move the upper cutting element toward the lower cutting element with sufficient force to cut through the bone segment
Data Source
AI summary
A bone cutting assembly includes a manually actuated upper cutting element that carries a plurality of cutting blades configured to cut through frozen bone segments. A lower cutting element supports a bone segment to be cut and can include cutting blades aligned with the cutting blades of the upper cutting assembly. A pivoting linkage or a rack and pinion arrangement can be provided between the upper cutting element and a manually operated handle to provide sufficient mechanical advantage or leverage to allow an operator to manually cut through the bone.