Flexible Anchorage Bone Biopsy Device Frustule Retention
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Solution Overview
Problem
Current bone biopsy devices face issues with frustule loss during extraction, particularly in fragile bone tissue, and require separate procedures for bone and marrow sampling, leading to inefficiencies and increased trauma for patients.
Innovation Solution
A bone biopsy device with a cannula and a plate having flexible anchorages that bend to grip the frustule, allowing secure extraction without additional instruments, and enabling marrow aspiration after frustule removal, while maintaining the cannula in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid teeth are used to grip the frustule, then strong bone tissue can be securely trapped, but fragile bone tissue cannot be effectively gripped
Solution Approach 1:
The patent changes the physical state of the anchorage elements from rigid to flexible, allowing them to dynamically adapt their stiffness. The flexible anchorages can bend and deform to accommodate fragile bone tissue while still providing secure grip through elastic recovery, resolving the contradiction between gripping strength and adaptability to different bone conditions
Solution Approach 2:
The patent introduces dynamic flexibility to the anchorage system. The flexible anchorages can dynamically adjust their configuration during insertion and retrieval - bending during insertion to minimize trauma, then springing back to securely grip the frustule base. This dynamic behavior allows the same structure to effectively handle both fragile and strong bone tissue
2Measurement precision
If separate instruments are used for bone and marrow sampling, then each sampling can be performed optimally, but procedural time and patient trauma increase
Solution Approach 1:
The patent merges two separate functions (bone frustule sampling and marrow aspiration) into a single integrated device. The cannula serves dual purposes: first as a coring instrument for obtaining the frustule, then remaining in place to facilitate subsequent marrow aspiration. This eliminates the need for instrument exchange and reduces procedural time while maintaining sampling quality
Solution Approach 2:
The cannula is designed with multi-functionality, serving both as a coring device for bone sampling and as a guide for marrow aspiration. The device's universal design allows it to perform multiple functions sequentially without requiring removal or replacement, thereby reducing procedural time and patient trauma while maintaining optimal sampling conditions for both bone and marrow
3Ease of operation
If the cannula is extracted immediately after frustule sectioning, then the procedure is simplified, but frustules are lost when they slip out of the mouth
Solution Approach 1:
The patent introduces flexible anchorages as an intermediary mechanism between the frustule and the cannula. These anchorages act as a retaining system that actively holds the frustule base during cannula extraction, preventing slippage and loss. The intermediary anchorage system allows the cannula to be extracted without compromising frustule retention, maintaining both procedural simplicity and sample integrity
4Reliability
If additional instruments are used to remove the frustule, then complete frustule retrieval is achieved, but device complexity and procedural steps increase
Solution Approach 1:
The patent implements a self-service mechanism where the flexible anchorages automatically engage with the frustule base during the coring process. The anchorages spring into position to grip the frustule, and the entire retrieval system is self-actuating without requiring separate removal instruments. This self-service approach ensures complete frustule retrieval while maintaining device simplicity and reducing the number of procedural steps
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 significantly reduces frustule loss and trauma, allowing for reliable sampling of fragile bone tissue and simultaneous marrow aspiration, enhancing procedural efficiency and diagnostic accuracy.
Implementation Method 1
The semi-cylindrical part of the plate has at its distal end at least a pair of small anchorages opposite with respect to a horizontal plane and adapted to bend with respect to said horizontal plane, when they encounter the narrowing of the mouth
Data Source
AI summary
A bone biopsy device includes an outer cannula having a mouth with a cutting edge to section a frustule of spongy bone, a plate mounted slidably within the cannula with a semi-cylindrical portion at its end, and a stylet mounted slidably within the plate and having a pointed tip protruding from the mouth of the cannula to pierce the bone. The mouth has a narrowing and the semi-cylindrical part of the plate has at its end at least one pair of opposed lunettes/anchorages bendable, with respect to a horizontal plane, towards the interior of the semi-cylindrical portion when they encounter the narrowing of the mouth, thereby occluding the lumen of the plate and clasp the base of the sectioned frustule and allow extraction of the frustule by way of the plate whilst the cannula is kept at the operating site, allowing aspiration of marrow after the frustule has been removed.