Saliva detection device, saliva detection system and operation method thereof

1. A saliva detection device, comprising a flexible friction power generation assembly configured to supply power to the saliva detection device and, in turn, comprising:

a first electrode;

a first macromolecule polymer layer which is disposed in contact with a surface of the first electrode and has a concave-convex structure on a surface thereof distal to the first electrode;

a second macromolecule polymer layer having a concave-convex structure on a surface thereof proximal to the first macromolecule polymer layer; and

a second electrode disposed in contact with a surface of the second macromolecule polymer layer distal to the concave-convex structure thereof,

wherein in response to deformation of the flexible friction power generation assembly, the concave-convex structures of the first macromolecule polymer layer and the second macromolecule polymer layer rub against each other, and an electric signal is output through the first electrode and the second electrode,

the saliva detection device further comprises a sample collector, an electrochemical sensor, and an electrical signal transmission member, wherein

the sample collector has a curvature such that a middle part thereof is lower than two ends thereof, and an electrochemical reaction sample groove is arranged in the sample collector;

the electrochemical sensor is arranged in the electrochemical reaction sample groove to detect component in a saliva sample and generate a corresponding electric signal; and

the electrical signal transmission member is configured to smit the electrical signal;

wherein the flexible friction power generation assembly is disposed at a bottom of the sample collector and is wrapped by a flexible waterproof insulating material;

wherein the first electrode, the first macromolecule polymer layer, the second macromolecule polymer layer and the second electrode of the flexible friction power generation assembly are stacked in a stacking direction perpendicular to an opening direction of the electrochemical reaction sample groove, and

a thickness of the flexible friction power generation assembly is approximately equal to a dimension of a cross section of the sample collector taken along the stacking direction; and

wherein the thickness of the friction power generation assembly is about 380 μm.

2. The saliva detection device of claim 1 , wherein the deformation of the flexible friction power generation assembly includes bending, and the flexible friction power generation assembly is configured to output a periodic alternating current signal through the first electrode and the second electrode by repeatedly bending and recovering.

3. The saliva detection device of claim 2 , further comprising: a stepping motor configured to periodically oscillate to drive the flexible friction power generation assembly to repeatedly bend and recover.

4. The saliva detection device of claim 1 , further comprising: an electrical storage element configured to store electrical energy generated by the flexible friction power generation assembly.

5. The saliva detection device of claim 1 , wherein each of the concave-convex structures is a micro-scale and/or nano-scale concave-convex structure.

6. The saliva detection device of claim 1 , wherein there is a difference between a material of the first macromolecule polymer layer and a material of the second macromolecule polymer layer, and/or a difference between surface roughness of a material of the first macromolecule polymer layer and a material of the second macromolecule polymer layer.

7. The saliva detection device of claim 1 , wherein

the sample collector has an overall curvature such that both ends thereof are higher than the middle part in a length direction thereof, and

the electrochemical reaction sample groove is arranged in the sample collector for collecting the saliva sample.

8. The saliva detection device of claim 7 , wherein,

the sample collector is made of a flexible material the same as that of the first macromolecule polymer layer and the second macromolecule polymer layer.

9. The saliva detection device of claim 1 , wherein the first macromolecule polymer layer and the second macromolecule polymer layer are made of a hydrophobic material.

10. The saliva detection device of claim 1 , further comprising:

a conductive pillar arranged on the sample collector and configured to electrically stimulate a salivary gland of an examinee wearing the saliva detection device.

11. The saliva detection device of claim 1 , wherein the sample collector has a liquid inlet on an outer wall thereof for allowing the saliva sample to enter the electrochemical reaction sample groove.

12. The saliva detection device of claim 1 , further comprising:

a sample amount reminding member configured to determine an amount of the saliva sample in the electrochemical reaction sample groove, and to issue a reminder and initiate a detection of the electrochemical sensor in response to the detected amount of the saliva sample reaching a preset threshold.

13. The saliva detection device of claim 12 , wherein the sample amount reminding member comprises any one of the following means disposed in the electrochemical reaction sample groove to determine the amount of the saliva sample in the electrochemical reaction sample groove based on a detection result of the means:

a humidity sensor configured to detect humidity within the electrochemical reaction sample groove;

a liquid level sensor configured to detect a liquid level within the electrochemical reaction sample groove; and

a pressure sensor configured to detect a pressure within the electrochemical reaction sample groove.

14. The saliva detection device of claim 1 , wherein the electrochemical sensor is configured to detect a content of glucose in the saliva sample and comprises a working electrode in a form of nanospheres which are loaded with riboflavin adenine nucleotide complex glucose dehydrogenase or glucose oxidase.

15. A saliva detection system comprising the saliva detection device of claim 1 and a terminal, the terminal comprising:

a communication interface configured to receive the electrical signal transmitted from the electrical signal transmission member; and

a processor configured to process and analyze the received electrical signal to directly convert it into a content of a component in the saliva sample, the component in the saliva sample comprising glucose, wherein the terminal further comprises:

a display configured to display the content of the component in the saliva sample.

16. An operation method of the saliva detection system as claimed in claim 15 , comprising:

deforming the flexible friction power generation assembly to generate electric energy, and storing the generated electric energy by using an electrical storage element;

placing the saliva detection device in a mouth of a user, and driving the sample collector, the electrochemical sensor and the electric signal transmission component to operate by using the stored electric energy to obtain detection data;

transmitting the detection data to a processor for processing to obtain a detection result; and

displaying the detection result through the display, wherein,

the deforming the flexible friction power generation assembly comprises: repeatedly bending and recovering the flexible friction power generation assembly by a stepping motor or manually.