Nerve Stimulation Cannula Assembly With Sealed Direct Positioning
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Solution Overview
Problem
Existing nerve stimulation methods face challenges with high skin contact resistance and large area stimulation, and existing cannulas lack direct and versatile stimulation capabilities.
Innovation Solution
A nerve stimulation set comprising a nerve stimulation device with a conductive stimulation element and a channel for fluid supply, integrated with an indwelling cannula, featuring connector parts that form seals and allow for flexible insertion and direct nerve stimulation, suitable for both nerve stimulation and fluid administration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the indwelling cannula tube is made rigid to simplify device advancement, then the advancement process is simplified, but patient disruption increases during long-term insertion
Solution Approach 1:
The system is divided into two distinct components: a rigid cannula for the insertion phase and a flexible indwelling catheter for the long-term indwelling phase. The rigid cannula provides structural support during advancement, while the flexible catheter minimizes patient discomfort during prolonged insertion.
Solution Approach 2:
The rigid cannula is used as a temporary insertion aid that is discarded after serving its purpose of advancing the flexible catheter into position. This preliminary rigid structure enables easy advancement without requiring the final indwelling component to be rigid.
2Object-affected harmful factors
If the indwelling cannula tube is made flexible to minimize patient disruption, then patient comfort is improved, but device advancement becomes more difficult
Solution Approach 1:
The advancement function is separated from the indwelling catheter and assigned to the rigid cannula. This allows the catheter to remain flexible for patient comfort while the cannula provides the rigidity needed for easy advancement.
Solution Approach 2:
The rigid cannula acts as an intermediary tool that facilitates the insertion of the flexible catheter. The cannula provides the mechanical strength needed for advancement, while the catheter provides the flexibility needed for long-term comfort.
3Reliability
If a sealing ring is added to the connector to improve sealing, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The sealing function is extracted from a separate sealing ring component and integrated directly into the connector structure through precision-machined sealing surfaces. This eliminates the need for additional sealing components while maintaining sealing reliability.
Solution Approach 2:
The sealing mechanism transitions from a separate elastomeric ring to integrated metal-to-metal or plastic-to-plastic sealing surfaces that form seals through precise geometric contact, eliminating the need for additional sealing components.
Data Source
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AI summary
The invention relates to a nerve stimulation set (10) comprising a nerve stimulation device (100) with a distal end (100a), wherein the device (100) includes an electrically conductive stimulation element and a channel for supplying a fluid, and an indwelling cannula (200) with an indwelling cannula tube (240) having a distal end (240a) and a proximal end (240b), wherein the device (100) has a first connector part (180) and the indwelling cannula (200) has a second connector part (280) complementary to the first connector part (180), wherein by connecting the first connector part (180) and the second connector part (280) the device (100) can be fixed in an axial position in which the distal end (100a) of the device (100) extends beyond the distal end (240a) the indwelling cannula (200) protrudes,wherein in the connected state of the first connector part (180) and the second connector part (280) the first connector part (180) and the second connector part (280) are connected to each other in such a way that a circumferential first seal (500) is formed.