Biopsy Device Arming Mechanism for One-Handed Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing biopsy devices often require two-handed operation and can be prone to unintentional triggering or jamming due to incorrect handling, leading to inefficiencies and reduced sample collection capabilities.
Innovation Solution
A single-handed biopsy device with a sliding arming button that performs distinct functions for cannula and stylet arming, incorporating symmetrical retaining elements and a security mechanism to prevent unintentional triggering, and minimizing transverse forces to reduce jamming risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional biopsy device with separate arming mechanisms for cannula and stylet is used, then the device can be operated with one hand, but incorrect handling may cause unintentional release of the shot
Solution Approach 1:
The patent combines the arming mechanisms for both the cannula and stylet into a single integrated arming button. When the button is pressed, it sequentially arms both components through a unified mechanism, eliminating the need for separate arming actions and reducing the risk of unintentional release while maintaining one-handed operation capability
Solution Approach 2:
The arming button performs preliminary arming actions for both the cannula and stylet before the actual shooting occurs. The mechanism ensures that both components are properly armed and positioned in advance, with interlocking features that prevent premature or unintentional discharge until the shooting trigger is actively pulled
2Device complexity
If a conventional biopsy device with sequential arming mechanism is used, then the device structure can be simplified, but incorrect handling may cause the shooting mechanism to become jammed
Solution Approach 1:
The patent employs asymmetrical cam surfaces and inclined planes within the arming mechanism that guide the cannula and stylet through predetermined motion paths. The asymmetric geometry ensures that components can only move in the correct sequence and direction, preventing misalignment or jamming even if the operator applies force incorrectly
Solution Approach 2:
The patent introduces intermediary cam surfaces and guide surfaces that mediate between the arming button and the needle components. These intermediary elements translate the operator's simple button press into controlled sequential motion, absorbing incorrect handling forces and preventing them from causing jams in the shooting mechanism
Data Source
Figure 1
Figure 2~4
Figure 5~7
AI summary
This invention relates to a device (10) for taking at least one sample of soft tissue from an organ, said device comprising a body (11) and a needle (12) arranged in the body and extending at least partly outside the body through the front end of the body, the needle is formed by a stylet (13) and a cannula (14) coaxial with said stylet, said device comprising a mechanism for arming the needle, designed for sequentially moving the stylet (13) and then the cannula (14) from a rest position to a shooting position wherein the stylet and the cannula are retracted towards the rear end of the body, and a triggering mechanism designed to release the stylet then the cannula and to allow their displacement from the shooting position to the rest position, the cannula being coupled to a cannula slider comprising at least one retaining element for engaging with the cannula slider in a shooting position, the stylet being coupled to a stylet slider (30) comprising at least one retaining element (32) for engaging with the stylet slider in a shooting position and means for unlocking (34) the cannula slider, characterized in that the mechanism for arming the cannula further comprises means for separating the means (34) for unlocking the cannula slider and said retaining element (26) for engaging with the cannula and at least one security element (36) designed for engaging with the stylet slider (30) in a position in which the means (34) for unlocking the cannula slider is separated from the retaining element (26) for engaging with the cannula slider (24) in a shooting position.