Conical Spring CPR Press With Audible Limit-Pressure Feedback
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Solution Overview
Problem
Existing cardiopulmonary resuscitation devices are often complex, space-consuming, and difficult to use, leading to delayed resuscitation efforts during cardiac arrest, with unclear audible signals and a requirement for central pressure application, which can result in rib fractures and instability.
Innovation Solution
A multi-part device with a conical spring system that adapts to the thorax anatomy, generating a clear audible signal through a spring system between a force transmission means and a base plate, featuring a conical spring element and a flat spring element, allowing for low initial torque that increases progressively, reducing the risk of rib fractures and optimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring system with two different springs is used to generate audible click signals, then the device can signal when limit pressure is reached, but the transmitted signal experiences too much attenuation and is not clear enough
Solution Approach 1:
The patent employs a vibrating membrane element that is mechanically coupled to the spring system. When the spring reaches its limit pressure, it causes the membrane to vibrate and produce a clearly audible click signal. This vibration-based approach amplifies the signal strength and reduces attenuation during transmission to the user.
2Volume of moving object
If geometric dimensions are reduced to make the device compact, then space consumption is reduced, but the device becomes too space-consuming for the required installation space
Solution Approach 1:
The patent implements a nested structure where the spring system is positioned within the housing, and the vibrating membrane is integrated into the spring assembly. The force transmission means is arranged to work within the confined space between the spring and the base plate. This nesting arrangement allows all components to occupy minimal space while maintaining full functionality.
Solution Approach 2:
The patent utilizes the vertical dimension efficiently by arranging the spring system to compress vertically within a compact height, while the vibrating membrane extends horizontally to provide sufficient surface area for signal generation. This dimensional optimization allows the device to fit within small footprints while maintaining operational effectiveness.
3Reliability
If mechanical pressure must act centrally on the pressure transmission medium, then the desired resuscitation effect is achieved, but this is not possible in practical use and can result in rib fractures
Solution Approach 1:
The patent designs the force transmission means with a distributed contact surface that applies pressure locally at multiple points across the chest, rather than requiring precise central alignment. The spring system is configured to automatically center the force application, providing reliable resuscitation effect while accommodating variations in user positioning and reducing the risk of rib fractures.
4Reliability
If multiple mechanical components are used to ensure functional reliability, then safety is improved, but the device becomes too complicated and time-consuming to use
Solution Approach 1:
The patent combines multiple functions into integrated components: the spring system serves both as the pressure-sensing mechanism and as the force transmission element, while the vibrating membrane is directly coupled to the spring assembly to generate signals. This merging eliminates the need for separate mechanical measurement and signaling mechanisms, reducing component count and simplifying operation while maintaining reliability.
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 rapid, uncomplicated, and safe cardiopulmonary resuscitation with a clear audible signal, reducing the risk of rib fractures and improving operational safety by providing a low starting torque and adaptable pressure application, while being space-efficient.
Implementation Method 1
A spring system with two different springs is arranged between the at least one pressure transmission means and the at least one pressure-absorbing element. When a predetermined limit pressure is reached by one of the two springs, the spring system generates an audible first click signal and a second click signal when the limit pressure decreases.
Implementation Method 2
A multi-part device with a conical spring system that adapts to the thorax anatomy, generating a clear audible signal through a spring system between a force transmission means and a base plate, featuring a conical spring element and a flat spring element, allowing for low initial torque that increases progressively
Implementation Method 3
A multi-part device with a conical spring system that adapts to the thorax anatomy, generating a clear audible signal through a spring system between a force transmission means and a base plate, featuring a conical spring element and a flat spring element
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A~2B
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.