Sensor for acquiring physiological signals
A device for acquiring and collecting physiological signals is disclosed. In at least one embodiment, the device provides an at least one sensor having a conductive layer comprising a conductive fabric of interlaced conductive and non-conductive fibers and a plurality of orifices throughout the conductive fabric, wherein the plurality of orifices are filled with a silicone rubber, and wherein the silicone rubber is attached to the conductive fabric without the use of an adhesive. An electrical connector is connected to the conductive layer, the electrical connector providing a separable interface between the conductive layer and an electronic instrument. The device further provides an electronic instrument for receiving and collecting signals acquired from the at least one sensor.
1. A device comprising:
an at least one sensor for acquiring physiological signals and an electronic instrument for receiving and collecting signals acquired from the at least one sensor; and
the at least one sensor comprising:
a conductive layer comprising:
a conductive fabric of interlaced conductive and non-conductive fibers and a plurality of orifices throughout the conductive fabric, wherein the plurality of orifices are filled with a silicone rubber, and wherein the silicone rubber is attached to the conductive fabric without the use of an adhesive;
an electrode; and
a track; and
an electrical connector connected to the track of the conductive layer, the electrical connector providing a separable interface between the conductive layer and the electronic instrument.
2. The device of claim 1 , wherein the track of the at least one sensor is covered with an insulating material.
3. The device of claim 1 , wherein the conductive fibers of the at least one sensor comprise 1) fibers including silver, copper, nickel, stainless steel, gold, silicone rubber loaded with carbon or silver powder; 2) non-conductive fibers coated with a conductive material; or 3) a mixture thereof.
4. The device of claim 1 , wherein the non-conductive fibers of the at least one sensor comprise fibers including wool, silk, cotton, flax, jute, acrylic, polyamide polyester, nylon, or elastic yarn.
5. The device of claim 1 , wherein the conductive fibers of the at least one sensor comprise fibers made of silver coated nylon and the non-conductive fibers are made of nylon.
6. The device of claim 1 , wherein the silicone rubber of the at least one sensor is a silicone rubber with molecular weight comprised between 400 g/mol and 600 g/mol.
7. The device of claim 1 , wherein the proportion of the conductive layer of the at least one sensor designed to be in contact with a skin surface comprises between 50% and 80% of the conductive layer and the proportion of the silicone rubber designed to be in contact with the skin surface comprises between 20% and 50% of the conductive layer.
8. The device of claim 1 , wherein the electronic instrument further stores and/or processes and/or transmits the signals received and collected from the at least one sensor.
9. A garment comprising the device as defined in claim 1 , wherein the at least one sensor is coupled to the garment so as to be placed in contact with skin of a user during the use of the garment.
10. The garment of claim 9 , wherein a portion of the garment which is coupled to the sensor is designed for applying a pressure equal or higher than 2 kPa.
11. The garment of claim 9 , wherein the garment comprises two layers comprising an inner and an outer layer, and the outer layer is able to compress the sensor to a body of the user with a pressure of at least 2 kPa.
12. The garment of claim 11 , wherein the outer layer comprises a system to regulate the pressure.
13. The device of claim 1 , wherein the plurality of orifices of the at least one sensor form an organized pattern.
14. The device of claim 13 , wherein the organized pattern is a circular pattern, sinusoidal pattern, straight line pattern, hexagon pattern, another pattern of geometric shapes, or a combination thereof.
15. The device of claim 1 , wherein the silicone rubber of the at least one sensor is located only in the plurality of orifices.
16. The device of claim 1 , wherein the at least one sensor is configured for detecting cardiac pulse, respiratory frequency, electrodermal response, electrical skin conductivity, electrocardiography, and/or electromyography.
17. A process for the preparation of an at least one sensor as defined in claim 1 , the process comprising the steps of:
a) die cutting the conductive fabric;
b) adding a liquid silicone in a manner that the liquid silicone penetrates and fills the plurality of orifices present in the conductive fabric; and
c) curing the liquid silicone to form the silicone rubber;
wherein steps a) and b) can be carried out in any order.