Mushroom-Shaped Subdural Drain With L-Shaped Lumen
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Solution Overview
Problem
Existing subdural drain devices lack versatility in allowing for both selective drainage and medication introduction, often requiring a hypodermic syringe for fluid removal and medication administration, and do not provide a mechanism for gravitational drainage or medication delivery using a drainage bag.
Innovation Solution
A mushroom-shaped subdural drain with a hollow stem and cap design, featuring a central L-shaped lumen for fluid communication, allowing for drainage by gravity or medication delivery through a drainage bag, and a side slit for easy lumen placement and removal, ensuring minimal kinkage and blockage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional subdural drain device is used, then the device structure is simple, but the device lacks versatility in allowing for both drainage and medication introduction
Solution Approach 1:
The subdural drain device is designed to perform multiple functions: it can drain fluid from the subdural space through the L-shaped lumen, and it can also introduce medication into the subdural space through the same lumen or through the hollow cap and stem. This multi-functional design allows a single device to replace what would traditionally require separate devices for drainage and medication administration.
2Ease of operation
If a hypodermic syringe is used for fluid removal and medication administration, then the device can perform drainage and medication functions, but the operation process becomes complex and requires repeated needle insertions
Solution Approach 1:
The device is pre-configured with an L-shaped lumen that provides continuous access to the subdural space. The hollow cap and stem are designed to receive and hold medication before administration. This preliminary preparation eliminates the need for repeated needle insertions, as the device remains in place and provides ongoing access for both drainage and medication delivery.
Solution Approach 2:
The L-shaped lumen acts as an intermediary pathway that connects the external environment to the subdural space. Instead of directly inserting needles through the skull and skin repeatedly, all fluid removal and medication administration occurs through this established lumen, simplifying the operation and reducing time loss.
3Productivity
If the device allows for gravitational drainage, then drainage efficiency is improved, but the device structure becomes more complex requiring a drainage bag connection mechanism
Solution Approach 1:
The L-shaped lumen is designed to allow gravitational drainage by creating a pathway where fluid can flow from the subdural space, through the hollow stem and cap, and into a drainage bag positioned at a lower level. The geometry of the lumen facilitates this gravitational flow without requiring additional pumping mechanisms or complex valves.
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
Enables efficient and versatile fluid management in the subdural space, allowing for both drainage and medication delivery through a drainage bag or syringe, with the option to remove or retain the lumen as needed, enhancing medical treatment options.
Implementation Method 1
Gravity will thus allow for drainage. If the bag is filled with medication, however, and located above the height of the subdural space, then it will flow into the subdural space
Implementation Method 2
If the bag is filled with medication, however, and located above the height of the subdural space, then it will flow into the subdural space at least until the pressure on the inside (within the subdural space) equalizes with the pressure and weight of the fluid in the drainage bag
Data Source
AI summary
A subcutaneous drain, preferably for implantation into the skull of a patient comprises a basically hollow cap and a stem with an inside, central passageway passing from top of the cap through the stem. A lumen is provided through at least a portion of the inside, central passageway with the lumen preferably exiting the cap through a side slit in the cap and stem. The lumen is provided with a supporting ledge to reduce kinkage and promote an unimpeded fluid path. The side slit is resilient to allow for the selective removal of the lumen. The cap and stem are, as mentioned, substantially hollow and defines a chamber in communication with the subdural space, so that with the device in place, a physician can use a hypodermic needle to gain access to fluid in the subdural space by piercing the needle tip of the hypodermic syringe or needle through the thin wall of the cap of the device. A circumferential flange is provided to facilitate location of the device. Also, the stem is slightly inwardly tapered.