Rotary-to-Linear Bone Coring Device for Cancellous Sample Retrieval
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Solution Overview
Problem
Current devices for accessing and coring bone are inadequate for efficiently retrieving core samples, particularly from cancellous bone, due to limitations in design and functionality.
Innovation Solution
A bone coring device with a handle comprising rotatably coupled components, featuring an elongated outer cutting member and an inner member that moves linearly within the outer cutting member, allowing for effective coring of bone samples through rotational actuation of the handle, facilitating both penetration and sample retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional bone coring device is used, then the device structure is simple, but the efficiency of retrieving core samples from cancellous bone is insufficient
Solution Approach 1:
The bone coring device is divided into multiple functional segments: an outer cutting member with teeth for penetrating cortical bone, an inner member for retrieving cancellous bone samples, and a handle assembly with rotatable components. Each segment performs a specific function, allowing the device to efficiently handle both cortical and cancellous bone while maintaining a manageable overall structure.
Solution Approach 2:
The inner member is nested within the outer cutting member, with the inner member's distal end positioned inside the outer cutting member's lumen. This nested configuration allows both components to work together in a compact arrangement, improving sample retrieval efficiency without significantly increasing device complexity.
2Productivity
If the outer cutting member and inner member move relative to each other linearly, then coring efficiency is improved, but the mechanism complexity increases
Solution Approach 1:
The handle assembly includes a first handle component and a second handle component that can rotate relative to each other. This rotational movement is converted into linear movement of the inner member relative to the outer cutting member through a mechanical linkage, enabling dynamic adjustment of the coring action while maintaining operational simplicity.
Solution Approach 2:
The mechanism transforms rotational motion (handle component rotation) into linear motion (inner member movement relative to outer cutting member). This dimensional transformation allows the operator to control the coring process through intuitive rotational hand movements while achieving the required linear penetration and sample retrieval action.
3Measurement precision
If the device includes features like detents and fenestrations, then depth control and sample visualization are improved, but the manufacturing complexity increases
Solution Approach 1:
The outer cutting member includes fenestrations (openings) that allow visual observation of the coring process and sample collection. These fenestrations provide natural light transmission and visual feedback without requiring complex electronic or optical systems, maintaining ease of manufacture while improving measurement and visualization capabilities.
Solution Approach 2:
The handle assembly includes detents that provide discrete depth control positions during the coring operation. These detents are integrated into the rotational mechanism of the handle components, providing precise depth control through simple mechanical features that are straightforward to manufacture.
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 precise and efficient removal of cancellous bone samples by transforming rotary motion into linear movement, allowing for effective penetration and secure sample collection, with features like detents and fenestrations aiding in depth control and sample visualization.
Implementation Method 1
rotatable movement of the first handle component relative to the second handle component causes relative, linear movement between the elongated outer cutting member and the inner member
Data Source
AI summary
Disclosed is a bone coring device having a handle including a first handle component and a second handle component. The first handle component is rotatably coupled to the second handle component. The device also includes a coring assembly mechanically coupled to the handle. The coring assembly includes an elongated outer cutting member having an internal bore and distal edge adapted to cut through cancellous bone. The coring assembly also includes an elongated inner member slidably positioned within the internal bore of the outer cutting member. Rotatable movement of the first handle component relative to the second handle component causes relative, linear movement between the elongated outer cutting member and the inner member to facilitate coring of a sample of bone when the coring assembly is positioned within the bone.