Sensor for acquiring physiological signals
The present invention relates to a sensor 1 for acquiring physiological signals with improved silicone rubber in particular when the sensor 1 is included in a garment 7 and the person who wears the garment 7 is in high level activity, the invention furthermore relates to a device comprising the sensor, as well as garments 7 comprising the device.
1. A sensor for acquiring physiological signals, the 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; and
an electrical connector connected to the conductive layer, the electrical connector providing a separable interface between the conductive layer and an electronic instrument.
2. The sensor according to claim 1 , wherein the conductive layer comprises at least an electrode and a track, the electrical connector being connected to the track.
3. The sensor according to claim 2 , wherein the track is covered with an insulating material.
4. The sensor according to claim 1 , wherein the conductive fibers 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.
5. The sensor according to claim 1 , wherein the non-conductive fibers comprise fibers including wool, silk, cotton, flax, jute, acrylic, polyamide polyester, nylon, or elastic yarn.
6. The sensor according to claim 1 , wherein the conductive fibers comprise fibers made of silver coated nylon and the non-conductive fibers are made of nylon.
7. The sensor according to claim 1 , wherein the silicone rubber is a silicone rubber with molecular weight comprised between 400 g/mol and 600 g/mol.
8. The sensor according to claim 1 , wherein the proportion of the conductive layer 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.
9. A device comprising:
at least one sensor as defined in claim 1 , and
the electronic instrument for receiving and collecting signals acquired from the at least one sensor.
10. A garment comprising the device as defined in claim 9 , 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.
11. The garment according to claim 10 , wherein a portion of the garment which is coupled to the sensor is designed for applying a pressure equal or higher than 2 kPa.
12. The garment according to claim 10 , 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 2kPa.
13. The garment according to claim 12 , wherein the outer layer comprises a system to regulate the pressure.
14. The device of claim 9 , wherein the electronic instrument further stores and/or processes and/or transmits data received and collected from the at least one sensor.
15. The sensor according to claim 1 , wherein the plurality of orifices form an organized pattern.
16. The sensor according to claim 15 , wherein the organized pattern is a circular pattern, sinusoidal pattern, straight line pattern, hexagon pattern, another pattern of geometric shapes, or a combination thereof.
17. The sensor according to claim 1 , wherein the silicone rubber is located only in the plurality of orifices.
18. The sensor according to claim 1 , wherein the sensor is configured for detecting cardiac pulse, respiratory frequency, electrodermal response, electrical skin conductivity, electrocardiography, and/or electromyography.
19. A process for the preparation of a 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.