Magnetic Rotor Programming Tool for Implantable Valve Safety
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Solution Overview
Problem
Existing magnetically programmable CSF shunt valves are prone to unintentional adjustment due to misapplication of external magnetic fields, leading to potential overdrainage or underdrainage, which can result in dangerous conditions such as subdural hematoma, and there is a need for tools and methods that provide both adjustment and verification of implantable valve settings effectively.
Innovation Solution
The development of unified tools and methods that integrate valve reading and adjusting functions into a single device, featuring a magnetic rotor with a rotor axis that can be turned by an externally applied magnetic field, incorporating a locking mechanism to prevent accidental adjustments, and using a biased recess for precise positioning and orientation, along with a magnet that can be a permanent or electromagnet, to ensure accurate and safe adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an external magnetic field is applied to adjust the valve setting, then the valve can be programmed to control CSF drainage, but the valve may be unintentionally adjusted leading to overdrainage or underdrainage
Solution Approach 1:
The patent applies preliminary action by requiring a two-step programming process: first unlocking the rotor with a magnetic field, then applying a second magnetic field to rotate the rotor to the desired setting. This preliminary unlocking step ensures that the valve is not accidentally adjusted, as both steps must be deliberately performed. The method also includes verifying the setting by reading back the rotor position, providing an additional safety check before finalizing the adjustment.
Solution Approach 2:
The patent implements feedback by incorporating a reading mechanism that allows the physician to verify the current rotor position and valve setting before and after adjustment. The reading device detects the magnetic field orientation of the rotor and provides feedback to confirm the setting, ensuring that the valve is correctly programmed and reducing the risk of unintentional or incorrect adjustments.
2Adaptability or versatility
If a magnetic rotor is used to control valve settings, then external programming is enabled, but the system becomes vulnerable to misapplication of magnetic fields
Solution Approach 1:
The patent requires a preliminary unlocking action before the rotor can be repositioned. The first magnetic field applied to the rotor serves to unlock it from its locked position, but does not directly change the setting. Only after this preliminary unlocking step can a second magnetic field be applied to rotate the rotor to the desired setting. This two-step process prevents accidental adjustment, as the rotor remains locked during normal operation and requires deliberate unlocking followed by setting adjustment.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a locking device that mediates between the magnetic field application and rotor movement. The locking device prevents direct rotation of the rotor by magnetic fields unless the unlocking condition is first met. This intermediary layer protects the system from misapplication of magnetic fields by ensuring that only properly sequenced magnetic field applications can change the valve setting.
3Ease of operation
If the valve setting can be adjusted externally, then invasive surgical procedures are avoided, but the risk of dangerous conditions such as subdural hematoma increases due to potential overdrainage or underdrainage
Solution Approach 1:
The patent implements a feedback verification system where the physician can read the current valve setting by detecting the rotor's magnetic field orientation before and after adjustment. This feedback allows the physician to confirm that the valve is set to the intended pressure threshold, reducing the risk of overdrainage or underdrainage. The ability to verify settings non-invasively ensures that external adjustments are performed correctly without requiring surgical intervention.
Solution Approach 2:
The patent requires preliminary verification of the valve setting through reading the rotor position before finalizing the adjustment. This preliminary check allows the physician to ensure that the external magnetic field application has achieved the desired setting and has not caused unintended overdrainage or underdrainage conditions. The combination of preliminary unlocking, adjustment, and verification steps provides a safety mechanism that reduces the risk of dangerous conditions while maintaining non-invasive adjustability.
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
The solution reduces the probability of unintentional valve adjustments, allows for precise reading and adjustment of CSF drainage flow and pressure settings, and enhances patient safety by minimizing the risk of overdrainage or underdrainage, thereby preventing complications like subdural hematoma.
Implementation Method 1
The rotor has a rotor axis about which the rotor can be turned by an externally applied magnetic field to adjust the valve
Implementation Method 2
The magnetic guide provides magnetic coupling to enhance the magnetic field interaction with the rotor
Data Source
AI summary
Integrated tools for noninvasively reading and adjusting an implantable, magnetically adjustable valve, and methods of use are disclosed. The tools include magnetic or electronic reading of the valve, and magnetic or electromagnetic adjustment of the valve. In use, the tools are positioned above or in contact with the patient's skin, in proximity to the valve.