Noninvasive Intracranial Pressure Measurement via Cervical Cuff Occlusion
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Solution Overview
Problem
Current noninvasive methods for measuring intracranial pressure (ICP) are limited by their reliance on expensive equipment, requirement for special training, need for calibration, inability to provide absolute values, and exposure to high-intensity acoustic energy, making them unsuitable for widespread use, especially in patients with external head injuries or in non-clinical settings.
Innovation Solution
A noninvasive method that registers cerebral hemodynamics and changes jugular vein pressure to estimate ICP by diverting cerebral venous outflow through the vertebral venous plexus, using a cervical cuff to occlude jugular veins and measure pressure redistribution, allowing for absolute ICP measurement without calibration or expensive equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive ICP measurement methods are used, then measurement precision is improved, but device complexity and ease of operation deteriorate due to calibration requirements and specialized training needs
Solution Approach 1:
The patent replaces complex mechanical transducer systems with a simplified pneumatic occlusion system. Instead of using calibrated pressure transducers that require specialized placement and maintenance, the invention uses a cervical cuff to apply controlled occlusion pressure to the jugular vein, creating a mechanical proxy for ICP measurement that eliminates calibration requirements
Solution Approach 2:
The patent introduces an intermediary measurement approach by using jugular vein occlusion pressure as a mediator to estimate ICP. Rather than directly measuring ICP through invasive transducers, the system measures the pressure required to occlude jugular venous outflow, which serves as an indirect but accurate proxy for intracranial pressure
2Measurement precision
If invasive ICP measurement methods are used, then measurement precision is improved, but ease of operation deteriorates due to requirement for highly-trained individuals
Solution Approach 1:
The patent replaces complex mechanical transducer systems with a simplified pneumatic occlusion system. Instead of using calibrated pressure transducers that require specialized placement and maintenance, the invention uses a cervical cuff to apply controlled occlusion pressure to the jugular vein, creating a mechanical proxy for ICP measurement that eliminates calibration requirements
Solution Approach 2:
The system performs self-calibration through the physiological response of the patient. The occlusion pressure required to divert cerebral venous outflow to the vertebral venous plexus automatically indicates the ICP value, eliminating the need for external calibration procedures or specialized operator knowledge
3Ease of operation
If noninvasive ultrasound methods are used, then ease of operation is improved, but measurement precision deteriorates due to inability to provide absolute ICP values
Solution Approach 1:
The patent changes the measurement parameter from qualitative ultrasound-based indices to a quantitative pressure measurement. By measuring the actual occlusion pressure required to divert venous outflow and correlating it with ICP, the system transitions from providing relative changes to providing absolute pressure values in mmHg
4Measurement precision
If invasive ICP measurement methods are used, then measurement precision is improved, but object-affected harmful factors worsen due to risks of brain damage and infection
Solution Approach 1:
The patent replaces invasive mechanical transducer insertion with a noninvasive cervical occlusion approach. The cervical cuff applies pressure externally to occlude jugular venous outflow, completely avoiding penetration of the skull or cranial structures, thereby eliminating risks of infection, brain damage, and other invasive procedure complications
Solution Approach 2:
The patent introduces an intermediary measurement approach by using jugular vein occlusion pressure as a mediator to estimate ICP. Rather than directly measuring ICP through invasive transducers, the system measures the pressure required to occlude jugular venous outflow, which serves as an indirect but accurate proxy for intracranial pressure
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 method provides reproducible, absolute ICP measurements that are independent of external injuries and can be performed in various settings, minimizing brain exposure to high-intensity acoustic energy and eliminating the need for calibration or specialized training.
Implementation Method 1
changes pressure in jugular veins to affect cerebral venous outflow... establishing jugular pressure value when an abrupt change in the cerebral hemodynamics occurs, whereby indicating a point when jugular venous outflow redistribution to vertebral venous plexus occurs
Data Source
AI summary
A method to measure effective cerebral outflow pressure or intracranial pressure is disclosed. The craniospinal venous system has multiple anastomoses between the jugular veins and vertebral venous plexus. Jugular veins collapse with cervical compression or head elevation, when extrinsic pressure exceeds venous pressure. The vertebral venous plexus is exposed to intracranial pressure and collapses when intracranial pressure exceeds venous pressure. Vertebral venous plexus is not compressed with head elevation or cervical compression, because enclosure in the spinal canal protects veins from the direct effects of atmospheric pressure and cervical compression. Using cervical compression and/or head elevation blood outflow is redistributed between jugular veins and vertebral venous plexus, while the degree of cervical compression or head elevation indicates effective cerebral outflow pressure or ICP.