Conical CPR Spring Assembly for Low-Torque Audible Compression
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Solution Overview
Problem
Existing cardio-pulmonary resuscitation devices are complex, require excessive space, and have high starting torque, making them difficult for laypersons to operate efficiently during cardiac arrest, and often result in rib fractures due to non-adaptive pressure application.
Innovation Solution
A multi-part device with a conical spring system that reduces starting torque and adapts to the rib structure, featuring a spring system with conical elements arranged between the force transmission means and base plate, allowing for a progressive increase in pressure and reducing installation space, while generating a clearly audible signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional spring system is used in cardio-pulmonary resuscitation devices, then the device can generate audible signals, but the starting torque is too high making it difficult for laypersons to operate
Solution Approach 1:
The patent applies parameter changes by transitioning from a conventional linear spring to a conical spring with progressively varying wire diameter and pitch. This geometric parameter variation creates a progressive spring constant that reduces starting torque while maintaining signal-generating capability, making the device easier for laypersons to operate during cardiac arrest emergencies.
2Object-affected harmful factors
If a conventional linear spring design is used, then the spring system is simple, but it causes rib fractures due to non-adaptive pressure application
Solution Approach 1:
The conical spring design implements parameter changes along its length, with wire diameter and pitch varying progressively from base to tip. This creates a progressive pressure application that adapts to the rib structure, distributing force more evenly and reducing the risk of rib fractures while maintaining the necessary compressive force for effective CPR.
3Ease of operation
If a u-shaped leaf spring arranged in the middle of a helical spring is used, then acoustic click signals can be generated, but the mechanical pressure must always act centrally on the pressure transmission means
Solution Approach 1:
The patent extracts the signal-generating function from the complex u-shaped leaf spring arrangement and implements it through the conical spring's inherent geometric properties. The conical spring generates audible click signals through its progressive compression and release, eliminating the need for centralized pressure application and allowing flexible positioning on the chest.
4Volume of stationary object
If existing resuscitation devices with multiple spring systems are used, then audible signals can be generated, but the devices require excessive installation space
Solution Approach 1:
The patent merges multiple functions into the single conical spring structure: it provides both the mechanical compliance needed for effective CPR and the signal-generating capability through its progressive geometry. This integration eliminates the need for separate spring systems and reduces installation space while maintaining reliable audible signal generation at pressure thresholds.
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 device enables quick, uncomplicated, and safe cardio-pulmonary resuscitation with reduced risk of rib fractures and improved usability for laypersons by minimizing initial pressure requirements and providing a clear audible signal, thus facilitating effective and efficient resuscitation.
Implementation Method 1
a spring system which consists essentially of at least one spring element (4) and a flat-formed spring element (5), wherein the spring element (4) is a conical spring element
Implementation Method 2
generating a clearly audible signal when a predetermined pressure is reached
Data Source
AI summary
The present invention relates to a multi-part device for generating a clearly audible sound when an external force is applied onto a first force-transmission means that acts, via a spring system, on a base plate in an apparatus for controlled cardiopulmonary resuscitation of the human body in the event of cardiac arrest, and is characterised in that the external geometric dimensions and shapes are adapted to the anatomical conditions of the pectoral-adjacent thorax, in particular the spring system generating a signal that acts on at least one oscillatable element, the spring system being arranged between the first force-transmission means and the base plate, which spring system consists substantially of at least one spring element and one planar spring element, in particular the spring element also being a conical spring element.