Basket-type Grasping Forceps with Segmented Binding Parts
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Solution Overview
Problem
Conventional basket-type grasping forceps face difficulties in removing large foreign objects from intracorporeal ducts due to the basket being unable to exit while holding the object, as the basket wires prevent the object from being released from the space between them.
Innovation Solution
The design incorporates a sheath with a manipulating wire and two binding parts, allowing the basket wires to be connected and disconnected, enabling the basket section to expand and contract, with a dense and sparse portion for capturing and introducing objects, and an adjusting mechanism to control the movement of the binding parts, facilitating the release of the object by breaking the basket section if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the basket wires are made dense to hold the foreign object, then the holding capability is improved, but the foreign object cannot be released from the space between the wires
Solution Approach 1:
The basket is divided into multiple binding parts (first binding part and second binding part) that can be separated from each other. The basket wires are segmented into multiple groups, with proximal ends fixed to different binding parts, allowing the basket to be divided into multiple sections that can be independently manipulated or released.
Solution Approach 2:
The binding parts are designed to be movable relative to each other along the manipulating wire. The first binding part can move between inside and outside of the sheath, and the second binding part can be held by or released from the first binding part, allowing dynamic reconfiguration of the basket structure during the procedure.
2Reliability
If the basket is made to hold large foreign objects, then the capture capability is improved, but the basket cannot be removed from the duct
Solution Approach 1:
The basket structure is segmented into multiple binding parts that can be separated. When the basket cannot be removed from the duct with the foreign object, the binding parts can be separated from each other, allowing the basket to be broken into sections for easier removal while retaining the captured object.
Solution Approach 2:
The basket is designed with the capability to be broken into multiple sections as a preliminary consideration. The binding parts are configured to allow separation, so that if removal becomes difficult, the basket can be intentionally divided into manageable sections before extraction from the duct.
3Stability of the object's composition
If the basket wires are arranged in a fixed configuration, then the structural stability is improved, but the basket cannot be expanded or contracted
Solution Approach 1:
The basket wires are arranged in a spiral shape between the binding parts, allowing the basket to expand and contract dynamically. The binding parts can move relative to each other along the manipulating wire, enabling the basket to change its diameter and shape as needed during the procedure while maintaining structural integrity.
Solution Approach 2:
The binding parts are nested within each other during storage in the sheath, with the second binding part capable of being held by the first binding part. This nested configuration allows compact storage while enabling expansion when deployed, similar to a nested doll structure that transforms from compact to expanded state.
Data Source
AI summary
A binding part of a basket-type grasping forceps includes: a first binding part to which proximal ends of first wires that are some of a plurality of basket wires are fixed; and a second binding part to which proximal ends of second wires not connected to the first binding part among the plurality of basket wires are fixed, which is engaged with the first binding part to be separable from the first binding part, is containable inside a sheath along with the first binding part in a state in which the second binding part is engaged with the first binding part, and is held by an inner surface of the sheath to be inseparable from the first binding part in the sheath.