Cannula Applicator Handle Mechanism for Stability
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Solution Overview
Problem
Existing percutaneous cannula application devices are prone to unintentional loosening of the prestressing device and instability during one-handed operation, which can lead to accidental displacement and contamination risks.
Innovation Solution
A handle-secured application device with pivoting wings that prevent unintentional release of the prestressing mechanism, ensuring the cannula remains stable by locking latching lugs in the longitudinal axis direction, and a self-closing closure device that automatically secures the cannula within the device without manual action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the actuating element is made movable for one-handed operation, then ease of operation is improved, but reliability deteriorates due to unintentional displacement
Solution Approach 1:
The patent applies preliminary anti-action by providing a handle part that prevents the actuating element from being displaced unintentionally before the intended release action. The handle part acts as a protective barrier that must be removed first, thereby preventing accidental activation while allowing intentional activation when the handle is removed.
2Ease of operation
If the prestressing device is made easily releasable for one-handed operation, then ease of operation is improved, but stability deteriorates due to transverse pressure on the cannula
Solution Approach 1:
The handle part provides preliminary protection against unintended release by physically blocking access to the actuating element. Only after intentional removal of the handle part can the actuating element be displaced, thereby preventing accidental transverse pressure on the cannula while maintaining ease of intentional operation.
3Ease of operation
If the closure device is made manually operable, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The closure device applies self-service by automatically closing the receiving part once the cannula is drawn into the device and uncovers the bottom opening. The prestressed closure device is spring-loaded to automatically seal the opening without requiring manual intervention, thereby reducing device complexity while maintaining operational effectiveness.
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
The device ensures secure cannula positioning and easy one-handed operation by preventing unintentional displacement and maintaining cannula stability, enhancing user safety and ease of use.
Implementation Method 1
The prestressing device consists of a compression spring 40, locking elements 36 arranged on a plate-shaped element (actuating element) 30
Implementation Method 2
A closure device is provided in the receiving part of the device according to the invention, which is pretensioned against the cannula
Data Source
Figure 1
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AI summary
The object of the present invention is to provide an application device for the percutaneous insertion of a cannula into an implanted port, which is secured against unintentional release of the pre-tensioning device and can be easily operated with one hand. This object is achieved by the features of claim 1. According to the invention, the application device includes a handle that not only allows the device to be used but also prevents the pre-tensioning device from being unintentionally released. The wing provided for releasing the pre-tensioning device can only be activated after the handle has been removed. When the pre-tensioning device is released, the wing pivots about a rotational axis. The lower end of the wing pushes the locking lugs of the locking device apart in the direction of the longitudinal axis of the cannula, thus preventing an unwanted force from acting transversely to the longitudinal axis of the cannula.This ensures the stability of the cannula's position. The receiving part of the device according to the invention incorporates a locking mechanism that is pre-tensioned against the cannula. As soon as the cannula tip is drawn into the body of the device and exposes the bottom opening of the receiving part, this opening is automatically closed by the pre-tensioned locking mechanism.