CPR Compression Leg-Angle Sensing for Sternal Alignment
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Solution Overview
Problem
Existing CPR chest compression machines struggle with inconsistent and ineffective compressions due to patient-specific anatomical variations, particularly the sternal angle, leading to potential organ damage or inadequate blood perfusion, and are challenging to position correctly on diverse patient chests.
Innovation Solution
A CPR device with a controller that adjusts the orientation of the contact surface or legs based on sensors and user inputs to ensure optimal chest compression alignment, accommodating varying sternal angles and maintaining perpendicular compressive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed piston-based compression mechanism is used, then the device structure is simple, but the compression effectiveness varies due to patient-specific anatomical variations
Solution Approach 1:
The patent implements a dynamic leg angle adjustment mechanism that allows the support legs to pivot and change their angle relative to the backboard. This enables the contact surface to be oriented perpendicular to the patient's sternum, accommodating variations in sternal angle and ensuring effective compressions for different patient anatomies.
Solution Approach 2:
The patent changes the geometric parameter of the support leg angle to adapt to different patient conditions. By allowing the leg angle to vary, the system optimizes the compression force vector to remain perpendicular to the sternum, improving compression reliability across diverse anatomical variations.
2Adaptability or versatility
If the contact surface orientation is fixed, then the device is easier to operate, but it cannot accommodate varying sternal angles
Solution Approach 1:
The patent incorporates sensors that automatically detect the patient's sternal angle and the controller automatically adjusts the leg angle to optimize compression orientation. This self-adjusting capability eliminates the need for manual positioning by operators, maintaining ease of operation while achieving high adaptability to varying anatomies.
Solution Approach 2:
The system uses sensors to detect patient anatomy characteristics and provides feedback to the controller, which then adjusts the leg angle accordingly. This closed-loop feedback mechanism ensures the device adapts to varying sternal angles while maintaining simple operation through automated control.
3Productivity
If the compression depth is increased to exceed 5 cm, then blood circulation is improved, but the risk of organ damage increases
Solution Approach 1:
The patent optimizes the compression force vector by adjusting the leg angle to be perpendicular to the sternum. This ensures that the full compression force is directed effectively into the chest, allowing achievement of adequate compression depth (exceeding 5 cm) with controlled force application, thereby improving blood circulation while minimizing unnecessary lateral forces that could cause organ damage.
Data Source
AI summary
A mechanical cardio-pulmonary resuscitation (CPR) device having a compression mechanism, a backboard, a support leg, and an angle sensor. The compression mechanism is configured to perform successive CPR compressions to a chest of a patient. The compression mechanism includes a piston and a driver coupled to the piston that is configured to extend the piston toward the chest of the patient and to retract the piston away from the chest of the patient. The backboard is configured to be placed underneath the patient. The support leg is configured to support the chest compression mechanism at a distance from the chest of the patient and above the backboard. The angle sensor is configured to measure an angle of the support leg relative to a reference plane that is parallel to the backboard.