Shape-Memory Thread Ejection Device for Loop Formation
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Solution Overview
Problem
Existing methods for securing meshed prosthetic structures using shape-memory threads face difficulties in fitting multiple loops within a tubular device without overlapping, especially during the expansion and retraction process.
Innovation Solution
A device resembling a gun with a hollow aiming rod, a cylinder for thread storage, and a control mechanism that allows for sequential thread ejection and rotation of the cylinder to form loops within the anatomical part through the mesh structure, utilizing a toothed ring and spring mechanism for efficient loop formation and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple threads are arranged in alignment in a tube, then the device can store multiple loops, but the threads risk overlapping during fitting
Solution Approach 1:
The device divides the thread storage into separate cylindrical chambers, with each chamber dedicated to storing a single thread. This segmentation prevents threads from overlapping or interfering with each other during the fitting process, while still allowing multiple loops to be stored in the same device.
Solution Approach 2:
The invention transitions from linear arrangement of threads to a three-dimensional cylindrical chamber structure. Threads are stored in separate radial compartments within the cylinder, utilizing spatial distribution in multiple dimensions to prevent overlapping while maintaining compact storage.
2Ease of operation
If threads are expanded linearly in the tube, then they can be fitted through the mesh structure, but the expansion process increases the risk of overlapping
Solution Approach 1:
The thread is extracted from its coiled storage state and pulled through the mesh structure in a controlled linear manner. The cylindrical chamber design allows the thread to be pulled out sequentially without interference from other threads, ensuring precise loop formation while maintaining ease of insertion.
3Productivity
If a plurality of loops are fitted in the expanded state, then multiple connections can be made, but overlapping occurs during fitting
Solution Approach 1:
Multiple threads are pre-loaded into separate cylindrical chambers before use. The device allows the operator to selectively activate and eject threads in a controlled sequence, performing the loop formation action by action rather than attempting to fit multiple loops simultaneously, thereby preventing overlapping while maintaining high productivity.
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 straightforward and reliable formation of multiple loops within the anatomical part, reducing the risk of overlapping and simplifying the fitting process, while allowing for easy use and multiple loop placement without the need for constant reloading.
Implementation Method 1
the threads are made out of a shape-memory material... being expanded linearly after insertion in a tubular element; resuming its original shape upon emerging from the tube
Data Source
AI summary
The device comes in the form of a gun with a body, a grip handle and a control component. The body has coaxially a hollow protruding aiming rod equipped, at its free end, with a cylinder containing the threads. The rod is capable, under the action of the control component, of allowing a thread ejection needle to move so that a loop is formed on emergence from the cylinder. The cylinder is mounted at the end of a fixed translation axis and engaged inside the rod; the other end of said axis engaging with a mechanism capable of partially rotating it and the cylinder, when said control component is released, in order to position another thread opposite said ejection needle.