Chest Compression Plate Actuation for Controlled CPR Force

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Solution Overview

Problem

Existing automated chest compression devices often deliver sudden forces to the chest, leading to complications such as rib fractures and pneumothorax, and require precise chest exposure for effective CPR, which can be challenging for untrained bystanders.

Innovation Solution

An automated chest compression device with a variable power stroke actuator and a chest compression plate that mimics manual CPR, providing controlled compression and decompression according to AHA guidelines, without requiring chest exposure, using a power unit, bracket, and linear rails for stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If automated chest compression devices deliver sudden forces to the chest, then compression effectiveness is improved, but risk of internal injuries (rib fractures, pneumothorax, hemothorax) increases

Engineering Contradiction:

Improvecompression effectivenessVSAvoidrisk of internal injuries

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies beforehand cushioning by using a compliant interface between the compression device and the patient's chest. The device incorporates a cushioning mechanism that absorbs and distributes the force before it reaches the chest, preventing sudden impact forces that could cause rib fractures or internal injuries while still delivering effective compression.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent changes the parameter of force delivery from sudden impact to controlled, gradual compression. By modifying the temporal and spatial distribution of compression force through mechanical design elements, the device achieves effective CPR compression while maintaining force levels below the threshold for causing internal injuries.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If precise placement of the device on the sternum is required, then compression accuracy is improved, but ease of operation deteriorates for untrained bystanders

Engineering Contradiction:

Improvecompression accuracyVSAvoidease of placement

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent applies self-service by designing the device to automatically locate and position itself on the correct spot of the chest. The device incorporates self-aligning features such as shape-complementary interfaces or guidance mechanisms that enable it to find the sternum position autonomously without requiring the operator to have anatomical knowledge or placement skills.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent uses visual indicators (color changes or marked zones) on both the device and the patient's chest area to guide proper placement. These visual cues make it easy for untrained bystanders to identify the correct positioning zone, eliminating the need for precise manual placement while maintaining compression accuracy.

Inventive Principle:

Principle #32Color changes

3Reliability

If automated chest compression device is used, then consistency of CPR delivery is improved, but device complexity increases

Engineering Contradiction:

Improveconsistency of CPR deliveryVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the complex control system from the compression mechanism itself and separates it into independent components. The automation for consistency is achieved through simple mechanical elements or basic electronic controls that regulate compression rate and depth, while the core compression function remains mechanically straightforward, reducing overall device complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

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

Delivers consistent and effective CPR with minimized risk of collateral damage, allowing untrained individuals to administer CPR efficiently and safely.

Implementation Method 1

a shaped actuator that converts rotary motion into linear motion, providing controlled compression and decompression of the chest

Methodology Applied

Scientific EffectMechanical motion conversion:

Implementation Method 2

using a variable power stroke actuator and linear rails to stabilize motion

Methodology Applied

Scientific EffectMechanical constraint:

Data Source

PatentUS12616639B2Automated CPR chest compression device

Publication Date: 2026.05.05 SCHWARTZ EFRAIM

AI summary

An automated chest compression device has a shaped actuator rotatably mounted about a shaft and a chest compression plate configured to move linearly based on the shape of the actuator, wherein engagement of the actuator with the chest compression plate converts rotary motion of the actuator into linear motion of the chest compression plate, and whereby, when the device is positioned against the chest of a patient in need of CPR, rotation of the actuator causes the chest compression plate to move linearly in a direction towards and away from the patient's chest and to thereby induce compression and to allow decompression, respectively, of the patient's chest.