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Apical impulse sensor based on reduced graphene oxide film with bilayer buckling structure

A graphene film and apical pulsation technology, applied in graphene, catheters, nano-carbon, etc., can solve problems such as unsuccessful development, and achieve the effects of enhancing tunneling effect, reducing resistance, and improving conductivity

Active Publication Date: 2017-02-22
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2008, a portable apical beat solid-state sensor was designed for bedside detection, but its further development was unsuccessful

Method used

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  • Apical impulse sensor based on reduced graphene oxide film with bilayer buckling structure
  • Apical impulse sensor based on reduced graphene oxide film with bilayer buckling structure
  • Apical impulse sensor based on reduced graphene oxide film with bilayer buckling structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The present invention adopts a reduced graphene oxide film with a double-layer buckling structure as the apical pulse sensor of the acquisition module, including a conversion unit, an electrical signal acquisition unit and a constant voltage unit, and the constant voltage unit outputs a voltage signal of 0.1V to the conversion unit , the electric signal acquisition unit collects the resistance signal of the conversion unit; the conversion unit collects the mechanical energy of the apex beat and converts it into an electrical signal; the electrical signal acquisition unit collects it.

[0020] The conversion unit is a reduced graphene oxide film with a double-layer buckling structure, and the non-toxic, harmless, and non-irritating reduced graphene oxide film with a double-layer buckling structure is adhered to the 4th and 5th root on the left side of an adult with medical tape. The signal that the apex of the heart hits the chest wall of the precordial region at a distan...

Embodiment 2

[0032] This example aims to study the effect of different stretching degrees on the performance of the sensor.

[0033]

[0034] It can be seen from the above table that the pre-stretched 30% PDMS can obtain a reduced graphene oxide buckling structure with good flatness and uniformity, and the hexagonal shape of the reduced graphene oxide is a two-dimensional layer of a honeycomb lattice. Structures can be tightly stacked. The buckling of the buckle can form an interlocking structure. When strain is applied, the interlayer spacing between the reduced graphene oxide sheets can be reduced, the contact area can be increased, the resistance can be reduced, and the conductivity can be enhanced. The interlocking structure can enhance the tunnel effect and further improve the conductivity of the sensor, that is to say, the sensitivity of the sensor is improved. However, if the pre-stretching is too small, it is difficult to form a uniform buckling structure and the buckling struc...

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Abstract

The invention provides an apical impulse sensor based on a reduced graphene oxide film with a bilayer buckling structure, belonging to the field of reduced graphene oxide sensors. A reduced graphene oxide film flexible sensor with a buckling structure is formed by carrying out suction filtration on a reduced graphene oxide water liquid to form a film, transferring reduced graphene oxide onto a flexible polydimethylsiloxane (PDMS) substrate which is pre-stretched by 30%, connecting copper wire electrodes at the two ends of reduced graphene oxide respectively, then relaxing reduced graphene oxide to return to the original state, cutting the reduced graphene oxide flexible film from the middle and folding the reduced graphene oxide flexible film in half so that the reduced graphene oxide layers come into contact with each other. The reduced graphene oxide film flexible sensor with a buckling structure has large specific surface area and excellent electrical conductivity and mechanical properties. A preparation method of the reduced graphene oxide sensor is mild in preparation conditions, controllable in technological parameters and low in cost, is simple and practicable and has high repeatability. The sensor can be attached to human skins and is used for testing the apical impulse.

Description

technical field [0001] The invention belongs to the field of reduced graphene oxide sensors, and in particular relates to an apex sensor for preparing a reduced graphene oxide film by combining suction filtration technology and transfer printing technology. Background technique [0002] Although the information obtained by palpation of the apical beat is very one-sided, it is an important part of the physical examination. In order to obtain objective diagnostic information, the apical beat map is accepted by the medical profession. However, conventional apical cardiographs are large devices that require a special soundproof room and at least two examiners. Due to the shortcomings of the traditional apical pulsation tester requiring a large space and personnel, and the development of more convenient echocardiographs, the traditional apical pulsation tester is gradually eliminated although it can provide certain objective information in the cardiac examination. [0003] Altho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184A61B5/02
CPCA61B5/02C01P2004/03C01P2002/72
Inventor 刘爱萍钱巍王夏华居乐乐
Owner ZHEJIANG SCI-TECH UNIV
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