Intraosseous Device Torque Transmission and Bone Penetration
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Solution Overview
Problem
Current intraosseous devices face difficulties in easily penetrating adult bone, necessitating a device that can effectively penetrate and stabilize within this tissue type.
Innovation Solution
The design incorporates a manual or powered intraosseous device with interlocking handle and hub formations, a bent stylet with a roughened surface, and a split flare cannula hub, allowing for enhanced torque transmission and penetration, along with a stabilizer for securing the device in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual intraosseous needles are used, then the device is simple and easy to manufacture, but the device fails to easily penetrate adult bone
Solution Approach 1:
The device is divided into distinct components: a cannula with a hub, a stylet with a handle, and interlocking formations. This segmentation allows each component to be optimized independently - the cannula for penetration, the stylet for torque transmission, and the handle for operator control - while maintaining ease of manufacture through modular assembly.
Solution Approach 2:
The invention adds rotational dimensionality to the penetration process by incorporating interlocking formations that enable the handle to rotate relative to the hub. This rotational motion provides mechanical advantage for penetrating adult bone, transforming a purely linear insertion motion into a combined rotational-linear action that overcomes the hardness of adult bone.
2Ease of operation
If the device incorporates interlocking handle and hub formations for torque transmission, then penetration capability improves, but device complexity increases
Solution Approach 1:
The interlocking formations utilize asymmetric geometry where the handle has protrusions that fit into corresponding recesses in the hub. This asymmetric design provides inherent mechanical interlocking for torque transmission while maintaining a relatively simple overall structure. The asymmetry ensures proper orientation and prevents reverse rotation during insertion.
Solution Approach 2:
The invention merges the functions of torque transmission and structural connection into the interlocking handle-hub formations. Rather than adding separate mechanisms for torque transmission, the structural connection itself is designed to transmit torque through the interlocking geometry, combining multiple functions into a single integrated feature.
3Productivity
If a bent stylet with roughened surface is used, then torque transmission and penetration efficiency improve, but manufacturing precision requirements increase
Solution Approach 1:
The stylet features a roughened surface applied locally at specific regions, particularly where torque transmission is most critical. This localized surface treatment provides enhanced friction and grip without requiring high-precision manufacturing across the entire stylet. The roughened surface can be applied through cost-effective processes like sandblasting or knurling at specific zones.
Solution Approach 2:
The bent stylet incorporates curvature rather than straight geometry, with a controlled bend angle (e.g., 90 degrees) that provides mechanical advantage during insertion. The curved geometry helps the stylet navigate tissue paths and leverage against bone surfaces during penetration, improving efficiency without requiring extreme manufacturing precision - standard bending tolerances are sufficient.
4Reliability
If a stabilizer is added to prevent dislodgement, then reliability improves, but device complexity increases
Solution Approach 1:
The stabilizer is designed to nest within or around existing device components, such as fitting around the hub or cannula. This nesting approach allows the stabilizer function to be added without creating a completely separate external component, thereby minimizing the increase in overall device complexity while maintaining the stabilization function.
Solution Approach 2:
The stabilizer is designed with universal attachment features that can interface with various hub configurations. By using standardized or adaptable connection mechanisms, the stabilizer can be integrated into different device embodiments without requiring custom-designed complex interfaces, thus adding stabilization capability with minimal complexity penalty.
Data Source
Figure 1
Figure 2
Figure 3(a)~3(c)
AI summary
An intraosseous device comprises a stylet (1) with a pointed end (103) for penetrating bone and a cannula (3) through which the stylet extends. The stylet (1) has a bent portion (10) which is engaged in a receiver (11) in a handle cover (7). The cannula (3) has an outwardly extending flare (20) which is engaged in a corresponding seat (21) in a hub (6). The handle and the hub have formations (41, 42) which interlock with one another when the tip (103) of the stylet (1) is aligned with the tip of the cannula (3). The interlock formations (41, 42) further assist torque transmission. The configuration ensures that the maximum manual torque can be applied to penetrate bone whilst ensuring that the stylet (1) and cannula (3) are aligned for maximum cutting efficiency and remain fixed to the handle (7) and the hub (6) respectively.