CN107684420B - Liquid metal electrocardioelectrode piece - Google Patents

Abstract

The invention provides a liquid metal electrocardio electrode plate which is of an integrated structure, wherein the electrode plate is circular and is divided into an upper layer and a lower layer along a central shaft, the upper layer is provided with a storage cavity (2), the lower layer is provided with a contact cavity (4), the storage cavity has variable volume and is internally filled with liquid metal, the contact cavity is a conical hollow cavity made of deformable elastic material, and when the electrode plate is used, the liquid metal in the storage cavity enters the contact cavity to enable the liquid metal to be directly contacted with skin; an adhesive layer (5) is arranged in the peripheral annular area of the contact cavity; and a lead (3) positioned in the center of the electrode plate penetrates through the storage cavity and the contact cavity, when the electrode plate is used, the lower end of the lead is soaked in the liquid metal, and the other end of the lead extends outwards from the center of the storage cavity and is used for being connected with a detection instrument. The liquid metal electrode plate provided by the invention has good flexibility, can be completely attached to the skin of a user, and effectively improves the contact area of the electrode; and the movable cavity is designed, so that the electrode plate can be repeatedly used.

Description

Liquid metal electrocardioelectrode piece

Technical Field

The invention relates to the field of medical materials, in particular to a liquid metal electrocardioelectrode plate.

Background

Various bioelectric signals exist in a living body, the most common of which is electrocardiosignals, and the detection of the electrocardiosignals has important significance for diagnosing cardiovascular diseases. The current in the living body is ion-conducting, while the current in the electrodes and the detecting instrument is electron-conducting, so that the ion-conducting in the living body must be converted into the corresponding electron-conducting by the electrodes. The skin of a human body is equivalent to a semipermeable membrane of ions and has a certain potential difference, and the metal and the skin realize the conversion from ion conduction to electron conduction through redox reaction in an electrolyte environment. The traditional electrocardioelectrode slice mainly comprises a metal sheet and conductive paste, wherein the conductive paste has the function of ensuring the metal sheet to be in good contact with skin and also has the function of electrolyte. At present, most electrocardio-electrodes adopt solid metal sheet electrodes, and the electrodes cannot be well matched with skin with uneven surface shape, so that the detection effect of the electrodes is influenced. In addition, although the disposable electrocardio-electrode plate has small volume and convenient use, the disposable electrocardio-electrode plate consumes large electrode materials and wastes resources.

The liquid metal is an alloy with a low melting point, such as gallium-based alloy, indium-based alloy, bismuth-based alloy, and the like. The alloy material has good conductivity and lower melting point, thus having wide application prospect in the aspects of flexible electronics, deformable machine research and the like.

Disclosure of Invention

The invention aims to provide a liquid metal electrocardioelectrode plate.

In order to realize the purpose of the invention, the liquid metal is applied to the preparation of the electrocardio-electrode slice, and the liquid metal is contacted with the skin with irregular shape by utilizing the fluidity and the conductivity of the liquid metal, so that the effective contact area is increased, and the detection effect of the electrocardio-electrode is improved. In addition, the invention combines the liquid metal with the elastic film with a specific shape, and a user can independently control the release and the recovery of the liquid metal, so that the electrode plate can be repeatedly used.

The invention provides a liquid metal electrocardioelectrode plate, which is an integrated electrocardioelectrode plate, wherein the electrode plate is integrally circular and is divided into an upper layer and a lower layer along a circular central shaft, the upper layer is provided with astorage cavity 2, the lower layer is provided with acontact cavity 4, thestorage cavity 2 is a cavity with variable volume, liquid metal is filled in the storage cavity, the liquid metal is released and recovered by changing the volume of the cavity, thecontact cavity 4 is a conical hollow cavity made of deformable elastic material, and when the electrode plate is used, the liquid metal in theupper storage cavity 2 enters thelower contact cavity 4, so that the liquid metal is directly contacted with skin; anadhesive layer 5 is arranged in the peripheral annular area of thecontact cavity 4 and used for fixing the electrode plate on the surface of the skin; thewire 3 that is located electrode slice center runs through inupper storage chamber 2 and lowerfloor contact chamber 4, and when the electrode slice used, the lower extreme ofguaranteeing wire 3 soaks in the liquid metal that gets intocontact chamber 4 fromstorage chamber 2, and the other end ofwire 3 outwards extends fromstorage chamber 2 center for link to each other with detecting instrument.

Thestorage cavity 2 is cylindrical or spherical, the volume of the cavity is changed through a piston or an elastic air bag, and thelead 3 penetrates through the center of the piston or the elastic air bag. In addition, variable volume chambers designed in other ways are within the scope of the invention.

The liquid metal is a metal or alloy material which keeps liquid state at normal temperature, and comprises gallium-based alloy, indium-based alloy, bismuth-based alloy and the like; or, the liquid metal is an alloy material with a modified metal surface, and the modification comprises oxidation treatment and the like.

Preferably, the liquid metal is gallium-indium alloy, gallium-indium-tin alloy, bismuth-indium-tin alloy or the like, and is in a liquid state at normal temperature.

More preferably, the liquid metal is formed from gallium and indium in a ratio of 75.5: 24.5, and the melting point of the gallium-indium alloy is 10.35 ℃.

The electrode plate is made of insulating and elastic materials, including rubber, silica gel or plastics, such as polydimethylsiloxane, polyethylene and the like, or other types of high polymer materials are used.

And a removable PVC film is adhered to the surface of theadhesive layer 5. The adhesive layer is made of an adhesive material of the traditional electrocardio-electrode, and when the electrode plate is not used, the PVC film is adhered on the surface of the adhesive layer to prevent the viscosity of the adhesive material from being reduced.

The invention also provides application of the liquid metal in preparing the electrocardio-electrode slice.

The liquid metal is a metal or alloy material which keeps liquid state at normal temperature, and comprises gallium-based alloy, indium-based alloy, bismuth-based alloy and the like; or, the liquid metal is an alloy material with a modified metal surface, and the modification comprises oxidation treatment and the like.

Preferably, the liquid metal is gallium-indium alloy, gallium-indium-tin alloy, bismuth-indium-tin alloy or the like, and is in a liquid state at normal temperature.

More preferably, the liquid metal is formed from gallium and indium in a ratio of 75.5: 24.5, and the melting point of the gallium-indium alloy is 10.35 ℃.

The invention provides a design scheme based on a liquid metal electrocardio-electrode plate for the first time, which utilizes the conductivity and the liquidity of liquid metal to directly contact with skin as an electrode. The liquid metal electrode plate has good flexibility, can be completely attached to the skin of a user, effectively improves the contact area of the electrode, and can be repeatedly used due to the design of the movable cavity.

Drawings

Fig. 1 is a schematic view of the overall structure of a piston-type liquid metal electrocardioelectrode plate inembodiment 1 of the present invention; wherein A is an overall appearance diagram of the electrode slice; and B is a cross-sectional view of the electrode sheet.

FIG. 2 shows the piston movement and the liquid metal position of the central electrode sheet in accordance withembodiment 1 of the present invention; wherein A is in an unused state; b is the use state.

Fig. 3 is a schematic view of the overall structure of a gas-bag type liquid metal electrocardioelectrode plate inembodiment 2 of the present invention; wherein A is an overall appearance diagram of the electrode slice; and B is a cross-sectional view of the electrode sheet.

FIG. 4 shows the deformation of the central electrode sheet and the position change of the liquid metal in the center electrode sheet according to example 2 of the present invention; wherein A is in an unused state; b is the use state.

In the figure, 1: liquid metal electrocardioelectrode plates; 2: a storage chamber; 3: a wire (connecting wire); 4: a contact cavity; 5: an adhesive layer; 6: a piston; 7: an elastic film; 8: an air bag; 9: a liquid metal.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the raw materials used are commercially available products.

The liquid metal used in the following examples was prepared from gallium and indium at 75.5: 24.5, and the melting point of the gallium-indium alloy is 10.35 ℃. Experiments show that the gallium-indium alloy can not be dissolved in water, is not easy to be absorbed by skin and is safe to use. The electrode sheet is made of insulating and elastic material, including rubber, silica gel or plastic, such as polydimethylsiloxane, polyethylene, etc., or other types of high molecular polymer materials are used.

In the description of the present invention, unless otherwise specified, the terms "upper", "lower", and the like, indicate orientations or state relationships only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

EXAMPLE 1 piston type liquid metal electrocardioelectrode slice

The overall structure schematic diagram of the piston type liquid metal electrocardioelectrode plate provided by the embodiment is shown in figure 1. The liquidmetal electrocardioelectrode slice 1 can be divided into an upper layer and a lower layer: the upper strata is the cylindricalupper storage chamber 2 that is located central authorities, and the center in upper storage chamber is the connectingwire 3 that runs through whole electrode slice, and lower floor central authorities are conical lowerfloor contact chamber 4, fillsliquid metal 9 and skin direct contact when using, and lower floor periphery ring shape region isviscose layer 5, and the surface has pasted the PVC film when not using, takes off the PVC film during use and pastes on the skin surface.

The piston motion situation and the liquid metal position change situation of the piston type liquid metal electrocardioelectrode plate provided by the embodiment are shown in figure 2. Theupper storage cavity 2 is a movable cavity with variable volume, and the change of the cavity volume is realized by adopting a movable piston mode in the embodiment: acircular rubber piston 6 is arranged in the upper part of theupper storage chamber 2. After the electrode plate is pasted on the surface of the skin, thepiston 6 is pushed inwards, so that theliquid metal 9 is poured into thelower contact cavity 4; after the electrode is used, the piston is pulled outwards, so that theliquid metal 9 is sucked back into theupper storage cavity 2. A deformableelastic film 7 is distributed on the upper surface of thelower contact cavity 4, and when thepiston 6 is pushed inwards, theelastic film 7 protrudes upwards to balance air pressure, so thatliquid metal 9 can smoothly enter thelower contact cavity 4.

Example 2 air sac type liquid metal electrocardioelectrode slice

The overall structural schematic diagram of the air bag type liquid metal electrocardioelectrode plate provided by the embodiment is shown in fig. 3. The liquidmetal electrocardioelectrode slice 1 can be divided into an upper layer and a lower layer: the upper layer is a sphericalelastic air bag 8 with openings at the upper and lower parts, andliquid metal 9 is filled in the upper layer; theair bag 8 is downwards connected with the lowerlayer contact cavity 4, and the lowerlayer contact cavity 4 is a conical cavity; a connectinglead 3 is inserted from the upper end opening of theair bag 8 and enters the lowerlayer contact cavity 4 through the lower end opening of theair bag 8; the lower layer periphery ring-shaped area is anadhesive layer 5.

The deformation condition of the air bag type liquid metal electrocardioelectrode plate and the position change condition of the liquid metal are shown in figure 4. When the electrode plate is used, the electrode plate is pasted on the surface of the skin and then theair bag 8 is pressed, so that theliquid metal 9 in the electrode plate enters the lowerlayer contact cavity 4 and is in contact with the skin; after the use is finished, theair bag 8 is loosened, and theliquid metal 9 is sucked back into theupper storage cavity 2 under the action of the self elastic force of theair bag 8. A deformableelastic film 7 is distributed on the upper surface of the lowerlayer contact cavity 4, and when theair bag 8 is extruded, theelastic film 7 protrudes upwards to balance air pressure, so thatliquid metal 9 smoothly enters the lowerlayer contact cavity 4.

Through detection, the liquid metal electrocardioelectrode plates prepared in theembodiments 1 and 2 have stable use effect, the goodness of fit with the test result of the commercial electrocardioelectrode is within 2%, and the change amplitude of long-term use is controlled within 5%.

Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (3)

1. The liquid metal electrocardioelectrode plate is characterized by being an integrated electrocardioelectrode plate, the electrode plate is integrally circular, and is divided into an upper layer and a lower layer along a circular central shaft, the upper layer is provided with a storage cavity (2), the lower layer is provided with a contact cavity (4), the storage cavity (2) is a cavity with variable volume, liquid metal is filled in the storage cavity, the liquid metal is released and recovered by changing the volume of the cavity, the contact cavity (4) is a conical hollow cavity made of deformable elastic material, and when the electrode plate is used, the liquid metal in the storage cavity (2) on the upper layer enters the contact cavity (4) on the lower layer, so that the liquid metal is in direct contact with skin; an adhesive layer (5) is arranged in the peripheral annular area of the contact cavity (4) and used for fixing the electrode plate on the surface of the skin; the lead (3) positioned in the center of the electrode plate penetrates through the upper storage cavity (2) and the lower contact cavity (4), when the electrode plate is used, the lower end of the lead (3) is ensured to be soaked in liquid metal entering the contact cavity (4) from the storage cavity (2), and the other end of the lead (3) extends outwards from the center of the storage cavity (2) and is used for being connected with a detection instrument;

the liquid metal is prepared from gallium and indium according to the weight ratio of 75.5: 24.5, wherein the melting point of the gallium-indium alloy is 10.35 ℃;

the storage cavity (2) is cylindrical or spherical, the volume of the cavity is changed through the piston, and the lead (3) penetrates through the center of the piston.

2. The electrocardioelectrode sheet according to claim 1, wherein the electrode sheet is made of an insulating and elastic material, including rubber, silica gel or plastic.

3. The electrocardioelectrode sheet according to claim 1 or 2, wherein a removable PVC film is adhered on the surface of the adhesive layer (5).

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