Elevated CPR Device for Cerebral Perfusion via Gravity Drainage
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Solution Overview
Problem
Conventional cardiopulmonary resuscitation (CPR) methods are inefficient in providing blood flow to the brain and heart, leading to reduced cerebral and cardiac perfusion, increased intracranial pressure, and potential brain damage due to the supine position and bi-directional pressure waves during chest compressions.
Innovation Solution
Elevating the head, heart, and shoulders during CPR to a position greater than zero degrees relative to horizontal, combined with regulating intrathoracic pressure, to enhance cerebral perfusion pressure, reduce intracranial pressure, and improve blood flow to the brain, using devices that support the thorax and head to maintain optimal alignment and airway management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional supine CPR is performed, then chest compressions can be applied to propel blood out of the non-beating heart, but cerebral and cardiac perfusion remain severely reduced at only 8-30% of normal levels
Solution Approach 1:
The patent inverts the conventional CPR approach by elevating the head and thorax to an upright position (greater than zero degrees relative to horizontal) instead of maintaining the traditional supine position. This inversion allows gravity to assist venous blood return to the heart during the decompression phase, significantly improving cerebral and cardiac perfusion efficiency while maintaining effective chest compressions.
Solution Approach 2:
The patent changes the positional parameter of the patient's body from horizontal (supine) to vertical (upright position with head and thorax elevated). This parameter change fundamentally alters the hemodynamic conditions during CPR, enabling gravity to work in favor of blood flow to the brain and heart, thereby improving perfusion from 8-30% of normal to significantly higher levels.
2Stress or pressure
If chest compressions are performed in supine position, then arterial pressure increases with each compression, but simultaneous rise in venous pressure transmits high pressure to the brain via paravertebral venous plexus and jugular veins
Solution Approach 1:
By inverting the body position from supine to upright, the patent reverses the direction of gravitational force acting on venous blood. This prevents the simultaneous transmission of high arterial and venous pressure to the brain, as gravity now assists in draining venous blood away from the brain during the decompression phase, thereby reducing intracranial pressure.
Solution Approach 2:
The patent uses gravity as a counterweight force to offset the harmful effect of venous pressure transmission to the brain. By positioning the head and thorax upright, gravity creates a downward force on venous blood that counteracts the upward transmission of pressure from chest compressions, preventing intracranial pressure spikes.
3Productivity
If conventional CPR is performed, then blood flow to the brain is limited, but elevating the head and thorax requires support devices and positioning mechanisms
Solution Approach 1:
The patent describes a positioning system that serves multiple functions: it elevates the head and thorax to the required angle, maintains airway patency, supports the patient's body weight, and enables effective CPR compressions. This multi-functional approach reduces the need for multiple separate devices while achieving the desired cerebral perfusion improvement.
4Reliability
If head and thorax are elevated during CPR, then cerebral perfusion pressure increases and intracranial pressure decreases, but maintaining this position requires continuous support
Solution Approach 1:
The elevated positioning system is designed to maintain the head and thorax in the upright position through self-supporting mechanisms that do not require continuous active adjustment or monitoring. The system automatically maintains the therapeutic position throughout the CPR procedure, enabling sustained improvement in cerebral perfusion pressure and reduced intracranial pressure for extended periods.
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 increases cerebral perfusion pressure, doubles blood flow to the brain, and reduces pulmonary vascular resistance, allowing for safer and more effective CPR for extended periods by utilizing gravity to drain venous blood from the brain and refill the heart, thereby reducing the risk of further brain damage.
Implementation Method 1
utilizing gravity to drain venous blood from the brain and refill the heart
Data Source
AI summary
An elevation device for the performance of CPR includes a base and a support coupled to the base that is configured to incline relative to the base so as to bend an individual at the individual's waist, thereby elevating an individual's heart, head, and shoulders relative to horizontal. The elevation device includes a chest compression device coupled with the support. The chest compression device includes a compression surface that is configured to interface with the individual's chest. The chest compression device is coupled to the support such that the chest compression device is configured to repeatedly compress the chest by applying force that is uniformly distributed across the compression surface during each chest compression and while the head, heart, and shoulders are elevated such that the compression surface does not shift position on the chest while the heart, head, and shoulders are elevated and chest compressions are being performed.