Hyperbaric Ventricular Shunt for Normal Pressure Hydrocephalus
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Solution Overview
Problem
Current treatments for Normal Pressure Hydrocephalus (NPH) are inadequate, as they often fail to restore ventricular size to normal levels and are associated with risks such as over- or under-drainage and infection, and there is a need for improved diagnostic and treatment methods that can complement existing therapies.
Innovation Solution
The method involves increasing intraparenchymal venous pressure to a normal or higher value without significantly altering cerebrospinal fluid (CSF) pressure, using techniques like hyperbaric chambers, compression boots, and ventricular shunts with adjustable valves to manage CSF drainage, thereby addressing the underlying venous compliance issues in NPH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If ventricular shunts are used to drain CSF, then ventricular size can be reduced, but risks of over-drainage, under-drainage, and infection increase
Solution Approach 1:
The invention changes the fundamental parameter being targeted from CSF pressure to intraparenchymal venous pressure. By increasing venous pressure through external compression devices rather than draining CSF, the treatment achieves ventricular reduction without the complications of shunt-dependent methods.
Solution Approach 2:
The invention replaces the mechanical CSF drainage system (shunts and valves) with an external compression system. This substitution eliminates the need for intracranial devices while achieving the same therapeutic goal of ventricular size reduction through a different mechanical approach.
2Volume of moving object
If CSF drainage is increased to reduce ventricular size, then ventricular dimensions improve, but risk of over-drainage and infection increases
Solution Approach 1:
The invention introduces an intermediary mechanism (external compression device acting on venous pressure) to achieve ventricular reduction. This intermediary approach avoids direct manipulation of CSF pressure and drainage, thereby eliminating the associated infection and over-drainage risks.
Solution Approach 2:
The invention extracts the problematic element of CSF drainage from the treatment approach. By removing the need for CSF shunting and drainage systems, the treatment eliminates the sources of infection and over-drainage complications while maintaining therapeutic effectiveness.
3Ease of operation
If traditional NPH treatments are applied, then some symptom relief may occur, but ventricular size is not restored to normal levels
Solution Approach 1:
The invention changes the target parameter from symptomatic management to structural normalization. By focusing on restoring normal ventricular dimensions through venous pressure modulation, the treatment achieves both anatomical correction and symptom relief, unlike traditional approaches that only address symptoms.
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
This approach effectively reduces ventricular size and alleviates symptoms by creating a pressure gradient that normalizes ventricular dimensions and improves clinical outcomes, while minimizing risks associated with traditional treatments.
Implementation Method 1
introducing the patient into a hyperbaric environment
Implementation Method 2
venting the CSF to an area with pressure lower than the hyperbaric environment
Data Source
AI summary
A ventricular shunt assembly, used in conjunction with a hyperbaric environment (e.g., having a pressure of about 250 to about 350 mm H2O above atmospheric pressure) can be used to correct a patient's intraparenchymal venous pressure from a sub-normally low value to a normal value. The shunt may comprise a valve, e.g., and adjustable valve, disposed between the ventricular catheter and the distal catheter. Optionally, the shunt comprises a reservoir on the ventricular side of the valve.