Adjustable Tip Needle Apparatus Depth Control
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Solution Overview
Problem
Existing needle and cannula systems lack precise control over needle insertion depth, relying on markings and look-up tables or detectable tips with X-rays/MRI, which are not always accurate or reliable for ensuring consistent and safe penetration depths, especially in thin-walled organs.
Innovation Solution
A device featuring a hub, slider, and cannula with a labyrinth mechanism, where a movable slider with a locking pin allows for adjustable needle length exposure beyond the cannula, enabling precise control of needle penetration depth through various slot positions, ensuring consistent and safe insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If needle depth is controlled using markings and look-up tables, then the device complexity is low, but the measurement precision and reliability of insertion depth are insufficient
Solution Approach 1:
The needle assembly is made dynamically adjustable relative to the cannula through a sliding mechanism with multiple lockable positions. The needle can be moved along the cannula axis and fixed at different depths, allowing precise control of insertion depth while maintaining a relatively simple overall device structure.
Solution Approach 2:
A sliding mechanism with locking pins acts as an intermediary between the needle and cannula, enabling precise depth control. The locking pins engage with indexed positions on the sliding mechanism, providing reliable and repeatable depth settings without requiring complex control systems.
2Reliability
If needle depth is adjusted manually without control mechanism, then the ease of operation is high, but the reliability and consistency of penetration depth are poor
Solution Approach 1:
The needle depth adjustment mechanism allows easy manual operation through sliding while providing reliable positioning through indexed locking. The user can smoothly adjust the needle to the desired depth and then lock it in place, combining ease of adjustment with reliable consistent positioning.
Solution Approach 2:
The locking mechanism with pre-defined indexed positions allows the user to select from predetermined safe depth positions. This preliminary preparation of depth options ensures consistent and reliable penetration depths while maintaining simple operation through direct selection and locking.
3Object-affected harmful factors
If needle extends beyond cannula without depth control, then the ease of manufacture is high, but the safety for thin-walled organ injection is compromised
Solution Approach 1:
The adjustable depth mechanism allows the needle extension beyond the cannula to be dynamically controlled and optimized for each injection scenario. This ensures the needle protrudes only as much as needed for safe injection into thin-walled organs, reducing the risk of over-penetration while maintaining a manageable device structure.
Solution Approach 2:
The depth control mechanism provides localized adjustment capability at the needle-cannula interface, allowing precise control of the critical needle tip position relative to the cannula opening. This localized control enhances injection safety for delicate organs without requiring complex system-wide modifications.
Data Source
AI summary
The invention in at least one embodiment includes a device having a hub, a housing, a cannula, and a needle where the relative positions of the hub and the housing controls the relative positions of the cannula and the needle. In at least one embodiment, the housing includes a pathway in which a pin on the hub travels through to allow for selection of the insertion depth of the needle relative to the cannula.