Basket Type Grasping Forceps With Segmented Distal Fixing Member
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Solution Overview
Problem
Basket type grasping forceps struggle to remove large foreign substances from duct lines due to failure in discharging them from the basket and risk of wire damage under excessive load, leading to incomplete removal and potential tissue damage during extraction.
Innovation Solution
The forceps incorporate a distal fixing member with different fixing strengths for basket wires, using an adhesive agent for one wire and a brazing material or solder for another, allowing controlled breaking and discharge of foreign substances while minimizing tissue contact and wire damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the basket holds large foreign substances, then the foreign substances can be collected, but the basket cannot be removed from the duct line and the foreign substances cannot be discharged
Solution Approach 1:
The basket wires are divided into two groups with different fixing strengths: some wires are fixed with strong fixing (brazing/solder) to maintain basket integrity, while others are fixed with weak fixing (adhesive) that can be easily broken. This segmentation allows the basket to be selectively opened by breaking only the weakly fixed wires, enabling foreign substance discharge while maintaining structural integrity through the strongly fixed wires.
Solution Approach 2:
Different portions of the basket wires have different fixing characteristics - the weakly fixed wires are designed to break under excessive load to open the basket, while the strongly fixed wires remain intact to maintain basket structure. This local differentiation of fixing strength allows the basket to transition from a closed holding state to an open discharge state as needed.
2Strength
If excessive load is applied to the basket wires, then the basket can hold large foreign substances, but the wires may be damaged and break
Solution Approach 1:
The basket is designed with predetermined weak points where wires are fixed with weak adhesive. These weak points act as safety valves that will break before the main basket structure fails under excessive load. This beforehand cushioning prevents catastrophic failure by providing a controlled failure mode that protects the overall system integrity.
Solution Approach 2:
The potential harm of wire breakage under excessive load is converted into a beneficial safety feature. The weakly fixed wires are designed to break precisely when excessive load is applied, preventing damage to the strongly fixed wires and the basket structure. The harmful breakage is redirected to occur in a controlled, non-critical portion of the system.
3Ease of operation
If the basket is opened to discharge foreign substances, then the foreign substances can be removed, but the basket structure may be damaged
Solution Approach 1:
The basket wires are segmented into weakly fixed wires (for opening) and strongly fixed wires (for structure). When the basket needs to be opened, only the weakly fixed wires break, while the strongly fixed wires maintain the basket's structural integrity. This segmentation allows functional opening without structural compromise.
Solution Approach 2:
Different local regions of the basket have different wire fixing strengths. The weakly fixed regions are designed to fail first during opening, while the strongly fixed regions maintain structural support. This local quality differentiation enables the basket to open for discharge while preserving overall structural integrity through the remaining strong fixtures.
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 efficient removal of foreign substances by creating a controlled opening in the basket, preventing wire damage and reducing the risk of tissue injury during extraction, facilitating complete removal without dropping components into the body.
Implementation Method 1
a wire-fixing section to which a first wire which is at least one of the plurality of basket wires is fixed
Implementation Method 2
a high-strength fixing section to which a second wire which is at least another one of the plurality of basket wires is fixed more strongly
Implementation Method 3
using an adhesive agent for one wire and a brazing material or solder for another
Data Source
AI summary
Basket type grasping forceps include a sheath, a main body section, and a manipulation section, the main body section includes a basket section and a manipulation wire, the basket section includes a plurality of basket wires and a distal fixing member fixed to the plurality of basket wires, and the distal fixing member has a wire-fixing section to which a first wire serving which is at least one of the plurality of basket wires is fixed, and a high-strength fixing section to which a second wire which is at least another one of the plurality of basket wires is fixed more strongly than a fixing strength of the first wire in the wire-fixing section.