Externally Programmable Shunt Valve With Magnetic Rotor Control
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Solution Overview
Problem
Existing magnetically adjustable shunts for treating hydrocephalus are susceptible to pressure changes due to strong magnets or magnetic fields, and verification of pressure settings requires radiopaque markers and X-ray imaging.
Innovation Solution
An externally programmable valve assembly with a magnetic rotor that adjusts pressure settings in finite increments using a side-to-side or up-and-down motion within the rotor casing, allowing for precise control via external magnetic fields, and includes a control device for verification without X-rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a magnetic rotor is used for external pressure adjustment, then the ease of operation is improved, but the reliability deteriorates due to susceptibility to external magnetic fields
Solution Approach 1:
A magnetic rotor acts as an intermediary between external magnetic fields and the valve mechanism. The rotor converts external magnetic field applications into controlled rotational movements that adjust the spring pressure on the valve element, allowing external programming while isolating the critical pressure-setting function from direct magnetic interference
Solution Approach 2:
The magnetic rotor enables preliminary adjustment of the pressure setting during implantation or before MRI procedures. By pre-adjusting the spring pressure to account for anticipated magnetic field effects during MRI, the system compensates for reliability issues before they occur during critical procedures
2Measurement precision
If radiopaque markers are used for verification, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent replaces radiopaque markers and X-ray imaging systems with a magnetic sensing system. Magnets embedded in the rotor interact with external magnetic sensors to verify pressure settings through non-invasive magnetic field detection, eliminating the need for radiological equipment and reducing overall system complexity
Solution Approach 2:
Instead of using physical radiopaque markers, the system creates a magnetic field signature that serves as a detectable copy or representation of the valve's pressure setting. This magnetic signature can be read externally without adding physical complexity to the valve assembly
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
Provides precise and stable pressure adjustments for shunts, reducing the risk of interference from external magnetic fields and enabling non-invasive verification of settings, thus improving treatment efficacy for hydrocephalus.
Implementation Method 1
a magnetic rotor that is configured to increase or decrease the pressure setting of the valve in finite increments... allowing for precise control via external magnetic fields
Data Source
AI summary
An externally programmable shunt valve assembly that includes a magnetic rotor that is operable in response to an externally applied magnetic field and configured to increase or decrease the working pressure of the shunt valve assembly in finite increments.