Bidirectional Valve for Hydrocephalus Shunt Administration

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Solution Overview

Problem

Current hydrocephalus shunt systems lack the ability to efficiently administer pharmaceuticals or contrast agents in a controlled manner, particularly in a direction opposite to the normal drainage flow, which is essential for effective treatment and examination.

Innovation Solution

A bidirectional valve design with a parallel switch system allows for the temporary interruption of drainage flow to enable the administration of treatment liquids in the opposite direction, utilizing a housing with inlet and outlet chambers and a closing mechanism that can be opened by increased pressure, ensuring the delivery of medicaments or contrast agents against the drainage flow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a unidirectional drainage valve is used to drain cerebrospinal fluid, then drainage function is reliable, but the ability to administer liquids in the opposite direction is lost

Engineering Contradiction:

Improvebidirectional flow capabilityVSAvoiddrainage function reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The valve is segmented into two independent closure mechanisms: a first closure (ball valve) for drainage flow control and a second closure (daphragm valve) for liquid administration. Each closure operates independently with its own actuation mechanism, allowing bidirectional flow control while maintaining reliable unidirectional drainage function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The valve design incorporates the ability to reverse flow direction by activating different closures. Normal drainage flow is blocked by the first closure, while the second closure opens to allow liquid administration in the opposite direction. The system seamlessly switches between drainage mode and administration mode by inverting the active flow path.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If a bidirectional valve is designed to allow liquid administration in opposite direction, then treatment flexibility is improved, but valve structure complexity increases

Engineering Contradiction:

Improveliquid administration capabilityVSAvoidvalve structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Two separate valve functions (drainage valve and administration valve) are merged into a single integrated valve body. The first closure (ball valve) and second closure (daphragm valve) share the same housing and inlet/outlet ports, eliminating the need for separate valve assemblies and reducing overall system complexity despite adding bidirectional capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single valve structure serves multiple functions: it acts as a non-return valve for drainage, a controllable valve for liquid administration, and a mixing chamber when both flows are active. The universal design allows one component to replace what would traditionally require multiple separate devices.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Quantity of substance

If treatment liquid is administered against drainage flow, then delivery concentration is improved, but risk of improper flow control increases

Engineering Contradiction:

Improvetreatment liquid concentrationVSAvoidflow control precision

Core Design Contradiction:

Quantity of substanceVSEase of operation

Solution Approach 1:

The valve design incorporates pressure-dependent closure activation. The first closure (ball valve) automatically opens when drainage pressure exceeds the spring force, providing feedback-based flow control. Similarly, the second closure responds to administration pressure, ensuring that liquid flows only when sufficient pressure is applied to overcome the closing force, preventing inadvertent activation.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

A diaphragm acts as an intermediary between the administration liquid and the second closure mechanism. The diaphragm transmits pressure from the administration liquid to actuate the closure, providing smooth and controlled opening. This intermediary mechanism ensures precise flow control by translating pressure changes into proportional closure movement.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 the administration of treatment liquids in a controlled and reversible manner, allowing for higher concentration delivery or mixing with drainage liquid, independent of patient position, thereby enhancing treatment efficacy and safety.

Implementation Method 1

Methodology Applied

Scientific EffectPressure increase: Pressure Increase

Data Source

PatentUS8870809B2Implantable hydrocephalus shunt system

Publication Date: 2014.10.28 CHRISTOPH MIETHKE GMBH & CO KG

AI summary

An implantable hydrocephalus shunt system. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. §1.72(b). As stated in 37 C.F.R. §1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure.” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.