Integrated Drill-Saw Bone Graft Harvester for Controlled Cuts
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Solution Overview
Problem
Current bone grafting devices lack the ability to controllably cut bone both inwardly and outwardly, fail to control the depth and longitudinal position of cuts, and have inaccessible handles, leading to complications and inefficiencies in autologous bone harvesting.
Innovation Solution
A device combining a longitudinal drill assembly, a module assembly, and a saw assembly, powered by a motor and tensioned spring, to simultaneously cut a cross-section of bone, longitudinally and transversely, utilizing a synergistic combination to harvest bone blocks, which includes a longitudinal drill assembly for longitudinal cutting, a saw assembly for transverse sawing, and a module assembly for stabilization, allowing precise and controlled bone harvesting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional bone grafting device is used, then the device structure is simple, but it cannot controllably cut bone both inwardly and outwardly, and cannot control the depth and longitudinal position of cuts
Solution Approach 1:
The device is divided into multiple functional modules: a drill assembly for longitudinal cutting, a saw assembly for transverse cutting, and a stabilizing module. Each module can be independently controlled and positioned, enabling precise depth and location control of bone cuts while maintaining manageable device complexity through modular design.
Solution Approach 2:
The device incorporates both longitudinal (drill) and transverse (saw) cutting capabilities, adding dimensional versatility to the cutting function. This multi-directional approach allows precise control over the three-dimensional position and orientation of bone cuts, achieving superior manufacturing precision in bone harvesting.
2Ease of operation
If a traditional bone grafting device is used, then the device is easy to manufacture, but the handle is inaccessible and leads to operational inefficiencies
Solution Approach 1:
The device incorporates a telescopic handle mechanism that can extend and retract, providing accessibility to the control interface during surgery. The dynamic adjustment of handle position allows the surgeon to maintain optimal ergonomics and control, improving ease of operation without significantly complicating the manufacturing process.
3Productivity
If multiple separate devices are used for longitudinal and transverse cutting, then each device can be simple, but the operation time increases and productivity decreases
Solution Approach 1:
The device merges the drill assembly for longitudinal cutting and the saw assembly for transverse cutting into a single integrated unit. Both cutting functions operate simultaneously or sequentially from one device, eliminating the need to switch between multiple devices during surgery. This integration significantly improves productivity by reducing operation time and streamlining the bone harvesting process, while the modular architecture keeps the overall device complexity manageable.
4Reliability
If imprecise bone cutting is performed, then the device structure is simple, but donor site morbidity increases and reliability decreases
Solution Approach 1:
The device incorporates depth gauges and positioning indicators that provide visual feedback to the surgeon during the cutting process. These feedback mechanisms ensure precise control over cutting depth and longitudinal position, preventing over-cutting or misplaced incisions that could cause donor site morbidity. The feedback system enhances reliability and donor site safety without requiring overly complex control mechanisms.
Data Source
AI summary
A device(100) and method(4100) for autologous bone graft harvesting simultaneously cuts a cross-section of a bone(900) longitudinally with a longitudinal drill assembly(102), and transversely with a saw assembly(126) during a bone(900) drilling to obtain a bone block for repairing and rebuilding diseased bones. The longitudinal drill assembly(102) and the saw assembly(126) simultaneously cut a cross-section of a bone(900). The device(100) is hand-controllable, drill motor powered, and spring-tensioned to selectively cut internally to the captured bone for internal bone harvesting. The longitudinal drill assembly(102) includes a drill shaft(114) extending perpendicular from a drill plate(112), having a flat surface(204) with a depth gauge(116). A module assembly(118) includes a module plate(120) disposed above the drill plate(112). Pins(302a,302b) extend from the upper face(308a) of the module plate(120) to engage ends of slots(400a,400b) to restrict over-rotation of saw plate(128). The saws (136a,136b) move between an open position(700a) for stowage, and a closed position(700b) while sawing the bone(900).