Cannula Retraction Device with Intermediary Pulling Element
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Solution Overview
Problem
Existing devices for applying cannulas to implanted ports often cause damage to the closure element due to the cannula tip being bent or twisted during retraction, leading to potential leaks upon repeated use.
Innovation Solution
A device with a pulling element integrated into the base element, allowing for one-handed operation, where a prestressing device retracts the cannula without bending the tip, and a closure element conceals the cannula tip to prevent exposure and injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cannula is retracted by exerting back pressure on the device, then the cannula is pulled out, but the tip of the cannula becomes curved and damages the closure element
Solution Approach 1:
A pulling element is introduced as an intermediary component between the operator and the cannula. This pulling element directly engages with the cannula shaft and extracts it through the closure element without requiring back pressure on the device, thereby preventing tip deformation and closure element damage
Solution Approach 2:
The device is segmented into distinct functional components: a base element for stabilization, a pulling element for cannula extraction, and a closure element for sealing. This segmentation allows the pulling element to perform the extraction function independently without transmitting damaging forces to the closure element
2Ease of operation
If two-handed operation is used to hold the device and pull out the cannula, then the cannula can be removed, but the workflow becomes more complex
Solution Approach 1:
The stabilization function (base element) and the extraction function (pulling element) are merged into a single integrated device structure. The base element remains on the patient's skin to stabilize the device while the pulling element is pulled to extract the cannula, enabling effective one-handed operation without requiring complex coordination between two hands
3Ease of operation
If the cannula tip is exposed after use, then the cannula can be removed, but the risk of injury increases
Solution Approach 1:
The closure element is designed to automatically or manually cover the cannula tip immediately after extraction. This preliminary protective action prevents exposure of the sharp tip, eliminating the injury risk while maintaining ease of cannula access during the procedure
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
Ensures non-destructive cannula removal and simplifies the workflow by eliminating the need for two-handed operation, protecting the port and preventing damage, while ensuring safe handling and secure closure of the cannula tip.
Implementation Method 1
The back pressure to be exerted on the device can result in the tip of the cannula being slightly curved before it is pulled out
Implementation Method 2
a closure element conceals the cannula tip to prevent exposure and injury
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to a device for administering a cannula (14) having a base element (10), a cannula (14) protruding with the tip (16) past the base element (10) in a ready position of the device, a tension element (12) movable relative to the base element (10), and a removable pre-stressing unit (36, 38, 40) for pre-stressing the tension element (12) relative to the base element (10) in the ready position of the device, wherein the tension element (12) interacts with the cannula (14) such that, when releasing the pre-stressing unit (36, 38, 40), the tension element (12) retracts the tip (16) of the cannula (14) into the base element (10).