Anatomical Extraction Basket With Articulated Loops
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current anatomical extraction devices, such as ureteroscopic baskets, face challenges in effectively capturing objects like kidney stones due to distal tips that cause bleeding and hinder visualization, or 'open-ended' baskets that fail to grasp objects securely, leading to objects being dislodged during extraction.
Innovation Solution
A medical extraction device with a hollow sheath and a repositionable basket comprising multiple loops and guides, where the loops can extend beyond the sheath to securely capture objects by increasing or decreasing their length, allowing for effective object retention and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a distal tip is added to the basket to improve structural integrity, then the basket becomes more stable, but the tip creates distance from the end to the functional engaging portion making stone entrapment more difficult and can pierce the renal calyceal urothelial lining causing bleeding
Solution Approach 1:
The patent removes the distal tip element from the basket design, extracting the harmful component that caused bleeding and visualization problems while retaining the essential wire structure for stone capture. The wires are configured to terminate without a distal tip, eliminating the piercing hazard while maintaining functional integrity.
Solution Approach 2:
Instead of adding a distal tip to improve stability, the invention inverts the approach by using free distal ends of the wires that can flex and adapt naturally. The stability is achieved through the wire configuration and joint design rather than through a rigid distal tip structure.
2Object-affected harmful factors
If 'open ended' baskets are used to eliminate distal tips and reduce bleeding, then visualization is improved, but the baskets cannot affirmatively grab the intended object causing objects to spurt out during extraction
Solution Approach 1:
The patent employs dynamic wire structures with joints that allow the basket to adapt its shape. The wires can flex and move to conform to the stone geometry, providing active engagement rather than passive containment. This dynamic configuration enables the basket to securely grasp objects while maintaining an open-ended design that prevents bleeding.
Solution Approach 2:
The invention changes the structural parameters of the basket by using wire configurations with specific joint designs that enable both open-ended operation and secure object grasping. The wire stiffness, joint geometry, and loop configurations are optimized to provide reliable object retention without requiring a distal tip.
3Ease of operation
If circumferential pressure is applied to the basket during extraction, then the basket can be drawn through the renal conduit, but this pressure causes objects to spurt out of open-ended baskets
Solution Approach 1:
The dynamic wire structure with articulated joints allows the basket to maintain its grasping force under circumferential pressure. The joints enable the wires to flex and adjust, maintaining engagement with the stone even when compression forces are applied during extraction through the renal conduit.
Data Source
AI summary
A medical extraction device comprising: (a) a sheath including a distal end configured to be inserted into a patient and a proximal end configured to be retained exteriorly of the patient; (b) a basket configured to extend from a distal end of the sheath and be repositionable between an expanded position and a retracted position, the basket including at least three loops, the basket also including a first guide and a second guide, where the first guide receives portions of the first loop and the third loop, where the second guide receives portions of the first loop and the second loop, where the second loop and the third loop are fixedly mounted to one another at a location interposing the first guide and the second guide; and, (c) a handle control operatively coupled to a proximal end of the sheath and being operatively coupled to the basket, the handle control configured facilitate repositioning of the basket with respect to the sheath between the retracted position and the expanded position.