Lumbar Puncture Cannula with Side Window for Fluid Detection
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Solution Overview
Problem
Current lumbar puncture procedures lack precision and safety due to the inability to accurately confirm the insertion depth and orientation of the cannula within the spinal canal, leading to risks of nerve damage, spinal fluid leaks, and prolonged procedure times, especially in young or sick patients.
Innovation Solution
A device featuring a cannula with beveled ends, depth markings, and windows with venting members that allow for visual confirmation of fluid presence and orientation during insertion, enabling earlier detection of spinal fluid and reducing the risk of complications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the physician waits for CSF to flow and drip from the proximal end of the needle after withdrawing the stylet, then visual confirmation of fluid presence is achieved, but procedure time is prolonged and patient risk increases
Solution Approach 1:
The patent introduces a window in the cannula wall that provides a lateral viewing dimension for observing CSF flow. Instead of waiting for fluid to drip from the proximal end, the physician can visually confirm fluid presence through the side window, dramatically reducing confirmation time and patient exposure to procedural risks.
Solution Approach 2:
The window acts as an intermediary viewing portal between the physician and the CSF flow. This intermediate structure allows direct visual confirmation of fluid presence without requiring the physician to wait for fluid to travel to the proximal needle end, thereby accelerating the confirmation process.
2Adaptability or versatility
If the physician performs lumbar puncture on young or sick patients who may move during the procedure, then necessary diagnostic or therapeutic intervention is provided, but risks of nerve damage, spinal fluid leaks, and respiratory arrest increase
Solution Approach 1:
The window provides immediate visual feedback to the physician regarding CSF flow and needle positioning. This real-time feedback allows for rapid confirmation of accurate needle placement and reduces the time the patient must remain in the curled-up position, thereby minimizing risks associated with patient movement and procedural duration.
Solution Approach 2:
The window allows the physician to perform preliminary visual confirmation of CSF flow before proceeding with stylet withdrawal and fluid collection. This preliminary action ensures accurate needle placement is confirmed early in the procedure, reducing the window of time during which complications could occur.
3Measurement precision
If depth markings and orientation markings are added to the cannula, then insertion depth and orientation can be confirmed, but device complexity increases
Solution Approach 1:
The patent employs visually distinct markings (depth markings and orientation markings) on the cannula that provide clear visual cues to the physician. These markings use contrasting visual features to indicate proper insertion depth and orientation, enabling precise placement without requiring complex mechanical or electronic systems.
Solution Approach 2:
The cannula is segmented with distinct functional zones: the beveled patient end for insertion, depth markings for depth control, orientation markings for proper alignment, and the window for fluid visualization. This segmentation of functions allows each feature to contribute specifically to accurate needle placement without creating an overly complex integrated system.
Data Source
AI summary
A device for drawing spinal fluid from a body part or injecting medication into the body part is disclosed. The device may include one or more measurement features (markings) that indicate the subcutaneous depth of the device as well as confirm placement and orientation of the spinal fluid withdrawing or medication injecting end of the device in the body part. The device may include a trocar and a cannula having a patient end, a non-patient end, an outer surface, and a central passage adapted to receive said trocar. One or more windows may be provided in or on the cannula, said windows extending from the outer surface of the cannula to the central passage. The windows may be spaced from the patient end of the cannula and from each other along a specific longitudinal axis of the cannula by a predetermined distance, such as 10 millimeters.