Abstract: Techniques are described for detecting erythema caused by wearable devices. In various embodiments, a wearable device may include light source(s) to emit light at multiple wavelengths; light sensor(s) to receive light reflected from tissue of an individual that wears the wearable device; and logic configured to: operate the light source(s) to emit light at multiple wavelengths; receive a signal generated by the light sensor(s), wherein the signal is generated by the light sensor(s) in response to detection of light reflected from the tissue; analyze the signal to determine a first metric from a first wavelength of the light reflected from a first depth of the tissue and a second metric from a second wavelength of the light reflected from a second depth of the tissue; identify a correlation between the first and second metrics; and provide output indicative of tissue erythema based on the correlation.

Abstract: A wearable system is for mounting against the skin of a subject. It comprises a flexible circuit board sandwiched (e.g. laminated) between a top layer and a base layer. The flexible circuit board has a meander section between end pads. The base layer and the top layer are bonded together by a bonding layer which has a meander opening around the meander section. This means the stretchability of the meander section is not inhibited by the lamination process.

Abstract: The present invention relates to a device for measuring a physiological parameter of a human limb such as peripheral capillary oxygen saturation. The device comprises a hollow elastic sleeve of a predetermined shape comprising a cavity having a closed-loop cross-section for enclosing the limb; first and second arms, each comprising a hinge portion between a coupling portion and a handle portion, the coupling portion of the first and second arms being adapted to be coupled, respectively, to first and second diametrically-opposite longitudinal sections of the sleeve; and a physiological sensor for interacting with the limb enclosed in said cavity. The hollow elastic sleeve holds the first and the second arms and causes their hinge portions to mutually engage to form a hinge mechanism so that, by applying a compression force on the handle portions, the first and second arms rotate about the hinge mechanism expanding the cavity, allowing the limb to be received therein.

Abstract: A powder delivery nozzle (12) for a personal care appliance (10) comprises a body (28), guidance tip (38), powder chamber (50), and flexible membrane (56). The body (28) includes an air-liquid channel (30) for delivery of air and/or liquid from a proximal end to a distal end thereof. The guidance tip (38), located at the distal end of the body (28), includes an orifice (40) coupled to the air-liquid channel (30) and is configured to expel a pulse of air and/or liquid. The powder chamber (50) is configured for storing a powder (52) and having an air intake port (42) and a powder outlet port (44). The flexible membrane (56) is disposed between the powder chamber (50) and the air-liquid channel (30). Responsive to delivery of a pulse of air and/or liquid via the air-liquid channel (30), a pulse of pressure is applied to the flexible membrane (56) for actuating a release of powder expelled from the powder chamber (50) via the powder outlet port (44). A method and personal care appliance are also disclosed.

Abstract: Techniques are described for detecting erythema caused by wearable devices. In various embodiments, a wearable device (104) may include light source(s) (106) to emit light at multiple wavelengths; light sensor(s) (108) to receive light reflected from tissue (100) of an individual that wears the wearable device; and logic (110) configured to: operate the light source(s) to emit light at multiple wavelengths; receive a signal generated by the light sensor(s), wherein the signal is generated by the light sensor(s) in response to detection of light reflected from the tissue; analyze the signal to determine a first metric from a first wavelength of the light reflected from a first depth of the tissue and a second metric from a second wavelength of the light reflected from a second depth of the tissue; identify a correlation between the first and second metrics; and provide output indicative of tissue erythema based on the correlation.

Abstract: The described embodiments relate to a sensor patch that can be temporarily removed and re-applied in the same location using a side element of the sensor patch. The side element can be folded onto the sensor patch when the sensor patch is adhered to an object such as an appendage of a person. The side element can be unfolded and adhered to the appendage in order to preserve the placement of the sensor patch on the appendage. In this way, maintenance such as cleaning can be performed on the area where the sensor patch is located without having to dispose of the sensor patch. Once maintenance is completed, the side element can be folded back onto a surface of the sensor patch until maintenance is to be performed again.

Abstract: A powder delivery nozzle (12) for a personal care appliance (10) comprises a body (28), guidance tip (38), powder chamber (50), and flexible membrane (56). The body (28) includes an air-liquid channel (30) for delivery of air and/or liquid from a proximal end to a distal end thereof. The guidance tip (38), located at the distal end of the body (28), includes an orifice (40) coupled to the air-liquid channel (30) and is configured to expel a pulse of air and/or liquid. The powder chamber (50) is configured for storing a powder (52) and having an air intake port (42) and a powder outlet port (44). The flexible membrane (56) is disposed between the powder chamber (50) and the air-liquid channel (30). Responsive to delivery of a pulse of air and/or liquid via the air-liquid channel (30), a pulse of pressure is applied to the flexible membrane (56) for actuating a release of powder expelled from the powder chamber (50) via the powder outlet port (44). A method and personal care appliance are also disclosed.