CN214276796U

CN214276796U - Novel flexible sensor for detecting human physiological signals based on coffee ring effect

Info

Publication number: CN214276796U
Application number: CN202022699610.9U
Authority: CN
Inventors: 胡本慧; 尹思梦; 王金毅; 周宇轩
Original assignee: Nanjing Medical University
Current assignee: Nanjing University; Nanjing Medical University
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-09-24
Anticipated expiration: 2030-11-19

Abstract

The utility model discloses a novel flexible sensor for detecting human physiological signals based on coffee ring effect, which comprises a flexible substrate layer, a strain sensing layer, a snake-shaped electrode lead, a packaging layer and an insulating lead; the flexible substrate layer is provided with the strain sensing layer, the snake-shaped electrode lead is arranged at two ends of the strain sensing layer, the far end of the snake-shaped electrode lead is provided with the insulating lead, the far end of the snake-shaped electrode lead is connected with an external microprocessor or a signal processing device, and the flexible substrate layer, the strain sensing layer and the snake-shaped electrode lead are packaged and protected by the packaging layer. The utility model has excellent stretchability, sensitivity and stability, can effectively solve the defects of poor flexibility, incompatible sensitivity and stability and the like of the prior flexible sensor, and can be worn for a long time and monitor the physiological condition of the human body in real time; and the flexible sensor has simple and convenient preparation process and is beneficial to large-scale production.

Description

Novel flexible sensor for detecting human physiological signals based on coffee ring effect

Technical Field

The utility model relates to a flexible sensor, in particular to novel flexible sensor based on human physiological signal is surveyed to coffee ring effect belongs to sensor technical field or functional material technical field.

Background

In recent years, flexible electronic sensors gradually become research hotspots and have the characteristics of being light, thin, portable, excellent in electrical performance, high in integration level and the like. As a flexible electronic device for sensing an applied force on a surface of an object, a flexible tensile strain sensor is generally evaluated in performance by three key factors: sensitivity, stretchability and long-term stability.

The carbon nano tube is a tubular object formed by coaxially bending single-layer or multi-layer graphite atoms, has the diameter of one to dozens of nanometers and the length of several micrometers, is a one-dimensional material with high length-diameter ratio and surface volume ratio, has excellent mechanical and chemical properties, electronic properties and biocompatibility, and is selected by scientific researchers as a material for preparing a flexible sensor. At present, a sensor prepared based on a carbon nano tube has the characteristics of high sensitivity and the like, but the compatibility of the high sensitivity and the high stability of the sensor is difficult to realize. Meanwhile, a method with a complex process is mostly adopted to prepare the microstructured device, so that large-scale preparation is difficult, and the application of the microstructured device in reality is limited. Achieving fast response, low cost manufacturing, high sensitivity and stability of flexible sensors remains a significant challenge.

In view of the above, there is an urgent need in the art to develop a flexible sensor that has a simple structure, is easy and convenient to manufacture, and has a rapid response, high sensitivity and stability.

SUMMERY OF THE UTILITY MODEL

The main object of the utility model is to provide a novel flexible sensor based on human physiological signal is surveyed to coffee ring effect to overcome the not enough of prior art existence.

For realizing the purpose of the utility model, the utility model discloses a technical scheme include:

a novel flexible sensor for detecting human physiological signals based on coffee ring effect is characterized by comprising a flexible substrate layer 1, a strain sensing layer 2, a snake-shaped electrode lead 3, a packaging layer 4 and an insulating lead 5; set up on the flexible substrate layer 1 strain sensing layer 2, snakelike electrode lead 3 sets up strain sensing layer 2's both ends, and its distal end sets up insulating lead 5, snakelike electrode lead 3's the external microprocessor of distal end or signal processing device connect, packaging layer 4 will flexible substrate layer 1, strain sensing layer 2 and the encapsulation protection of snakelike electrode lead 3.

Preferably, the flexible substrate layer 1 is a rectangular flexible stretchable substrate which is stacked in sequence, and the material of the substrate includes: polydimethylsiloxane PDMS or polyimide PI is flexible and biocompatible high polymer, has a Young modulus similar to that of body skin, can deform along with the stretching state of the skin, and is provided with four smooth corners 101 as a flexible substrate, so that the edge of the substrate is softened and the ergonomic design is met.

Preferably, the strain sensing layer 2 is a thin film based on a carbon nanotube gradient structure, and is attached to the flexible substrate layer 1, and the flexible substrate layer 1 drives the strain sensing layer 2 to deform; the strain sensing layer 2 can realize the function of converting the self deformation degree into the change of the electrical property, which is mainly reflected in the change of the resistance value.

Preferably, two serpentine electrode leads 3 are respectively arranged on two sides of the strain sensing layer 2 and are serpentine electrode plates with two circularly expanded ends, one end of each serpentine electrode lead is arranged on the strain sensing layer 2, and the other end of each serpentine electrode lead is arranged on the flexible substrate layer 1 and is connected with the insulating lead 5.

Preferably, the insulated lead 5 is connected with the serpentine electrode lead 3 through a conductive layer 501, the conductive layer is a part wrapped inside an insulating layer 502 of the insulated lead 5, a section of the conductive layer extends from the proximal end to be attached to the electrode base sheet 302 of the serpentine electrode lead 3, and an electrode upper cover sheet 301 is covered on the conductive layer, and the three are closely connected.

Preferably, the package layer 4 is a soft transparent package layer capable of deforming along with the flexible substrate layer 1, a plurality of anti-slip cross grains 401 arranged in parallel are arranged on the package layer 4, the four sides of the package layer are provided with package layer smooth corners 402 with the same radian as the flexible substrate smooth corners 101, one end of the package layer 4 close to the insulating lead 5 is provided with a lead leading-out block 403 which is a rectangular block with two cylindrical holes 4031, the two insulating leads 5 respectively extend out of the two cylindrical holes 4031, and the lead leading-out block 403 and the package layer 4 are designed in an integrated manner.

Preferably, the strain sensing layer 2 and the serpentine electrode lead 3 are patterned by a mask method.

This disclosure snakelike structure of snakelike electrode lead wire when making novel flexible sensor deformation, reserve tensile space, difficult fracture leads to the system performance to descend.

The present disclosure forms a flexible sensor by sequentially forming a strain sensing layer and a flexible conductive layer on a flexible substrate layer, and encapsulating the above structure. Because the strain transmission layer is directly formed through the self-assembly effect, the complicated procedures and errors of subsequent integrated devices are avoided, and the preparation efficiency of the flexible sensor is improved. In addition, the flexible sensor disclosed by the invention is made of flexible materials, has strong conformal capability, reduces the influence of measurement to the maximum extent, and is favorable for obtaining more accurate data.

Compared with the prior art, the advantage of this patent includes: the sensor has excellent stretchability, sensitivity and stability, can effectively overcome the defects of poor flexibility and the like of the conventional flexible sensor, and can be worn for a long time and monitor the physiological condition of a human body in real time; and the flexible sensor is simple and convenient in preparation process, saves cost and is convenient for large-scale production from the industrial aspect.

Drawings

Fig. 1 is a schematic perspective view of a novel flexible sensor for detecting physiological signals of a human body based on the coffee ring effect in an embodiment of the present invention;

fig. 2 is a schematic diagram of a partially exploded perspective structure of a novel flexible sensor for detecting physiological signals of a human body based on the coffee ring effect in an embodiment of the present invention;

fig. 3 is a schematic diagram of a junction between a snake-shaped electrode lead and an insulation lead of the novel flexible sensor for detecting physiological signals of a human body based on the coffee ring effect in the embodiment of the present invention;

fig. 4 is a schematic diagram of a lead-out block of a novel flexible sensor for detecting physiological signals of a human body based on the coffee ring effect in the embodiment of the present invention;

in the figure: 1. a flexible substrate layer; 101. a flexible substrate fillet; 2. a strain sensing layer; 3. a serpentine electrode lead; 301. an electrode upper cover plate; 302. an electrode negative film; 4. a packaging layer; 401. anti-skid cross striations; 402. a package layer is provided with a smooth corner; 403. a lead wire lead-out block; 4031. a cylindrical bore; 5. an insulated lead wire; 501. a conductive layer; 502. an insulating layer;

Detailed Description

In order to clarify technical problems, technical solutions, implementation processes and performance displays, the present invention is further described in detail with reference to the following embodiments.

A novel flexible sensor for detecting human physiological signals based on coffee ring effect is shown in figures 1-2 and comprises a flexible substrate layer 1, a strain sensing layer 2, a snake-shaped electrode lead 3, a packaging layer 4 and an insulating lead 5; set up on the flexible substrate layer 1 strain sensing layer 2, snakelike electrode lead 3 sets up strain sensing layer 2's both ends, and its distal end sets up insulating lead 5, snakelike electrode lead 3's the external microprocessor of distal end or signal processing device connect, packaging layer 4 will flexible substrate layer 1, strain sensing layer 2 and the encapsulation protection of snakelike electrode lead 3.

As a possible embodiment, the flexible substrate layer 1 is a rectangular flexible stretchable substrate which is stacked in sequence and made of materials including: polydimethylsiloxane PDMS or polyimide PI is flexible and biocompatible high polymer, has a Young modulus similar to that of body skin, can deform along with the stretching state of the skin, and is provided with four smooth corners 101 as a flexible substrate, so that the edge of the substrate is softened and the ergonomic design is met.

As a possible implementation manner, the strain sensing layer 2 is a thin film based on a carbon nanotube gradient structure, and is attached to the flexible substrate layer 1, and the flexible substrate layer 1 drives the strain sensing layer 2 to deform; the strain sensing layer 2 can realize the function of converting the self deformation degree into the change of the electrical property, which is mainly reflected in the change of the resistance value.

As a possible implementation manner, two serpentine electrode leads 3 are respectively arranged on two sides of the strain sensing layer 2, and are serpentine electrode sheets with two circularly expanded ends, wherein one end of each serpentine electrode lead is arranged on the strain sensing layer 2, and the other end of each serpentine electrode lead is arranged on the flexible substrate layer 1 and is connected with the insulating lead 5.

As a possible embodiment, as shown in fig. 3, the insulated lead 5 and the serpentine electrode lead 3 are connected by a conductive layer 501, which is a portion wrapped inside an insulating layer 502 of the insulated lead 5, and extends proximally to attach to the electrode base sheet 302 of the serpentine electrode lead 3, and covers an electrode cover sheet 301, which are closely connected.

As a possible implementation manner, the packaging layer 4 is a soft transparent packaging layer that can deform along with the flexible substrate layer 1, and is provided with a plurality of anti-skid cross grains 401 arranged in parallel, and four sides are provided with packaging layer smooth corners 402 with the same radian as the flexible substrate smooth corners 101; as shown in fig. 4, a lead-out block 403 is disposed at one end of the package layer 4 close to the insulating lead 5, and is a rectangular block with two cylindrical holes 4031, two insulating leads 5 respectively extend from the two cylindrical holes 4031, and the lead-out block 403 and the package layer 4 are designed as an integral body.

As a possible implementation manner, the strain sensing layer 2 and the serpentine electrode lead 3 are patterned by using a mask method.

As a possible implementation mode, the novel flexible sensor is attached to the skin of a human body for detection, when the novel flexible sensor is stretched and deformed, the resistance value of the novel flexible sensor is changed to serve as signal transmission data, the deformation quantity of the flexible sensor can be reflected in a high-sensitivity mode, and the testing method is suitable for physiological data such as human body pulse or voice signals.

The utility model provides a can survey human physiological signal's novel flexible sensor strain coefficient is big based on coffee ring effect, can effectively solve shortcomings such as current flexible sensor flexibility is poor, sensitivity is poor just method production simple process is convenient for carry out large-scale production.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A novel flexible sensor for detecting human physiological signals based on a coffee ring effect is characterized by comprising a flexible substrate layer (1), a strain sensing layer (2), a snake-shaped electrode lead (3), a packaging layer (4) and an insulating lead (5); set up on the flexible substrate layer (1) strain sensing layer (2), snakelike electrode lead wire (3) set up strain sensing layer's (2) both ends, and its distal end sets up insulating lead wire (5), the external microprocessor of distal end or the signal processing device of snakelike electrode lead wire (3) connect, packaging layer (4) will flexible substrate layer (1), strain sensing layer (2) and snakelike electrode lead wire (3) encapsulation protection.

2. The novel flexible sensor for detecting the human physiological signals based on the coffee ring effect as claimed in claim 1, wherein the flexible substrate layer (1) is a rectangular flexible stretchable substrate which is sequentially stacked and deformed along with the stretching state of the skin, and the four corners of the flexible stretchable substrate layer are set to be smooth corners (101) of the flexible substrate, so that the edge of the flexible substrate is softened and meets the ergonomic design.

3. The novel flexible sensor for detecting the physiological signals of the human body based on the coffee ring effect as claimed in claim 1, wherein the strain sensing layer (2) is a thin film based on a carbon nanotube gradient structure, and is attached to the flexible substrate layer (1), and the flexible substrate layer (1) drives the strain sensing layer (2) to deform; the strain sensing layer (2) can realize the function of converting the self deformation degree into the change of the electrical property, and mainly reflects the change of the resistance value.

4. The novel flexible sensor for detecting human physiological signals based on the coffee ring effect as claimed in claim 1, wherein there are two serpentine electrode leads (3) respectively disposed on two sides of the strain sensing layer (2) and having two circularly enlarged serpentine electrode pads, one end of each serpentine electrode lead is disposed on the strain sensing layer (2), and the other end of each serpentine electrode lead is disposed on the flexible substrate layer (1) and connected to the insulating lead (5).

5. The novel flexible sensor for detecting human physiological signals based on the coffee ring effect as claimed in claim 1, wherein the insulated lead (5) is connected with the serpentine electrode lead (3) through a conductive layer (501), the conductive layer is a part wrapped inside the insulated layer (502) of the insulated lead (5), a section of the conductive layer extends from the proximal end of the conductive layer to be attached to the electrode bottom sheet (302) of the serpentine electrode lead (3), and an electrode upper cover sheet (301) is covered on the conductive layer, and the insulated lead and the serpentine electrode lead are closely connected.

6. The novel flexible sensor for detecting human physiological signals based on the coffee ring effect as claimed in claim 1, wherein the encapsulation layer (4) is a soft transparent encapsulation layer which can deform along with the flexible substrate layer (1), a plurality of anti-slip cross-stripes (401) are arranged in parallel, the four sides of the encapsulation layer are provided with encapsulation layer round corners (402), one end of the encapsulation layer (4) close to the insulation lead (5) is provided with a lead extraction block (403) which is a rectangular block with two cylindrical holes (4031), the two insulation leads (5) respectively extend from the two cylindrical holes (4031), and the lead extraction block (403) and the encapsulation layer (4) are designed in an integrated manner.

7. The novel flexible sensor for detecting human physiological signals based on the coffee ring effect as claimed in claim 1, wherein the strain sensing layer (2) and the serpentine electrode lead (3) are patterned by a mask method.