Abstract: A tightening port for use with a hemostasis valve of an introducer sheath includes a gripper configured for engagement with the hemostasis valve hub, the gripper having a proximal end, a distal end, a cylindrical body defining a lumen, and a plurality of protrusions extending from the proximal end, a base having a cylindrical body and a lumen defined therethrough for receiving a portion of the gripper, and a plurality of engagement features configured for engaging with the plurality of protrusions of the gripper, and wherein the lumen of the gripper has an initial diameter prior to engagement with the base, and the lumen of the gripper has a compressed diameter after engagement with the base, wherein the compressed diameter is less than the initial diameter.

Abstract: Some disclosed blood pressure estimation methods involve controlling, by a control system, an ultrasonic sensor system to transmit ultrasonic waves to a target object on an outer surface of an apparatus, the ultrasonic sensor system having M ultrasonic receiver elements in a single array. Some such methods involve receiving, by the control system from the ultrasonic sensor system, ultrasonic receiver signals from each of a plurality of the M ultrasonic receiver elements in the single array, the ultrasonic receiver signals corresponding to ultrasonic waves reflected from the target object. Some such methods involve detecting, by the control system, an artery within the target object based on the ultrasonic receiver signals. Some such methods involve estimating, by the control system, a blood pressure within the artery based on the ultrasonic receiver signals.

Abstract: Some disclosed examples involve controlling, by a control system of an apparatus, a light source system of the apparatus to provide light to a target object on an outer surface of the apparatus and receiving, by the control system, ultrasonic receiver signals from each of a plurality of M ultrasonic receiver elements in a single array, the ultrasonic receiver signals corresponding to ultrasonic waves generated by the target object responsive to the light. Some disclosed examples involve detecting, by the control system, an artery within the target object based on the ultrasonic receiver signals and estimating, by the control system, a blood pressure within the artery based on the ultrasonic receiver signals.

Abstract: Systems and techniques are provided for wireless communications. For example, a process can include determining a frequency hopping configuration corresponding to a plurality of frequency hops between a plurality of carrier frequencies, and transmitting a continuous carrier signal to a Radio Frequency Identification (RFID) tag, where the continuous carrier signal comprises a pilot tone transmitted on each respective carrier frequency of the plurality of carrier frequencies. A process can include receiving, from the RFID tag, a continuous backscatter signal including a corresponding reflection of the pilot tone transmitted on each respective carrier frequency of the plurality of carrier frequencies. A process can include determining an estimated distance from a wireless communication device to the RFID tag based on a plurality of measurements obtained from the continuous backscatter signal.

Abstract: Systems and techniques are provided for wireless communications. A wireless communication device can obtain information indicative of a configured sequence of carrier frequencies associated with phase-based ranging (PBR) distance estimation between the wireless communication device and a Radio Frequency Identification (RFID) tag. An RFID Query command transmitted from a first RFID reader device to the RFID tag can be detected. A pilot tone can be sequentially transmitted to the RFID tag on each respective carrier frequency of the configured sequence, using a corresponding plurality of frequency hops synchronized between at least the wireless communication device and the first RFID reader device. A PBR measurement can be determined, indicative of an estimated distance from the wireless communication device to the RFID tag based on relative phase measurement associated with a backscatter signal received from the RFID tag for each respective carrier frequency of the configured sequence of carrier frequencies.

Abstract: Some disclosed examples involve receiving ultrasonic receiver signals from an ultrasonic receiver system corresponding to ultrasonic waves generated by a target object responsive to light from a light source system, estimating one or more blood vessel features based, at least in part, on the ultrasonic receiver signals and estimating blood pressure based, at least in part, on the one or more blood vessel features. Some disclosed examples involve receiving inertial sensor data from an inertial sensor system, determining whether the inertial sensor data indicates apparatus motion that exceeds a threshold and controlling a photoacoustic plethysmography (PAPG) system that includes the light source system and the ultrasonic receiver system according to whether the apparatus motion exceeds the threshold.

Abstract: Some disclosed examples pertain to an apparatus that can include a platen, a light source system, a receiver system, and an electromagnetic interference (EMI) shield. The light source system can include light source system circuitry, a light-emitting component, and a light guide component having a substantially uniform cross-section. The light-emitting component provides light to an area of the platen via the light guide component. The receiver system can include at least two receiver stack portions residing proximate on either side of the light guide component. The receiver system detects acoustic waves corresponding to a photoacoustic response of a target object proximate the area of the platen, to light emitted by the light source system. The EMI shield shields the receiver system from at least some of the EMI produced by the light source system circuitry. The light guide component conveys light through a portion of the EMI shield.

Abstract: An apparatus may include a platen, a light source system and a receiver system. The light source system may at least a first light-emitting component and at least a first light guide component. The first light guide component may be configured to transmit light from the first light-emitting component towards a target object in contact with a first area of the platen. The receiver system may include at least two receiver stack portions. A first receiver stack portion may reside proximate a first side of a first portion of the first light guide component and a second receiver stack portion may reside proximate a second side of the first portion of the first light guide component. The receiver system may be configured to detect acoustic waves corresponding to a photoacoustic response of the target object to light emitted by the light source system.

Abstract: Flexible sensing apparatus and various configurations of sensor stacks associated therewith are disclosed. Example embodiments may include a sensing system having: a flexible printed board; a sensor stack including: a flexible and optically transparent substrate disposed on the flexible printed board, the flexible and optically transparent substrate comprising polyimide; and a flexible sensor element disposed adjacent to the flexible substrate, the flexible sensor element including a first stack of materials, the first stack of materials including: a piezoelectric layer; and a receiver element disposed adjacent to the piezoelectric layer and configured to detect one or more acoustic signals received through the flexible substrate; and a control system configured to determine a physiological characteristic associated with a target object based on the one or more acoustic signals, electrical signals generated by the piezoelectric layer, or optical signals detected by the receiver element.

Abstract: Flexible sensing apparatus and various configurations of sensor stacks associated therewith are disclosed. In some embodiments, an acoustic sensing system may include: a flexible substrate comprising polyimide and having a thickness between 5 and 80 ?m; and a flexible acoustic sensor element disposed adjacent to the flexible substrate, and including a stack of materials, the stack of materials including: an acoustic receiver element configured to detect one or more acoustic signals received through the flexible substrate; a piezoelectric layer disposed adjacent to the acoustic receiver element; and an acoustic transmitter element configured to transmit one or more acoustic signals through the flexible substrate. The flexible substrate and the flexible acoustic sensor element may be configured to conform to a curvature of a surface that is constructed to contact a body part of a user from which the one or more acoustic signals transmitted from the acoustic transmitter element are reflected.

Abstract: An apparatus may include a transparent display stack and a transparent fingerprint sensor stack. The transparent fingerprint sensor stack may include transparent fingerprint sensor circuitry, transparent fingerprint sensor electrodes, a transparent piezoelectric layer and a transparent adhesive layer proximate the transparent display stack. In some examples, at least some layers of the transparent fingerprint sensor stack may be, or may include, an acoustic resonator configured to produce a local maximum of ultrasonic wave transmission at a frequency in a range from 1 MHz to 20 MHz.

Abstract: Flexible sensing apparatus and various configurations of sensor stacks associated therewith are disclosed.

Abstract: Some disclosed examples pertain to an apparatus that can include a platen, a light source system, a receiver system, and an electromagnetic interference (EMI) shield. The light source system can include light source system circuitry, a light-emitting component, and a light guide component having a substantially uniform cross-section. The light-emitting component provides light to an area of the platen via the light guide component. The receiver system can include at least two receiver stack portions residing proximate on either side of the light guide component. The receiver system detects acoustic waves corresponding to a photoacoustic response of a target object proximate the area of the platen, to light emitted by the light source system. The EMI shield shields the receiver system from at least some of the EMI produced by the light source system circuitry. The light guide component conveys light through a portion of the EMI shield.

Abstract: Systems and techniques are provided for wireless communications. For example, a process can include receiving, by a wireless communication device, a plurality of backscatter signals from a Radio Frequency Identification (RFID) tag, wherein each backscatter signal comprises a reflection of a respective RFID ranging signal. An estimated distance from the wireless communication device to the RFID tag can be determined, using a respective RFID measurement associated with each backscatter signal of the plurality of backscatter signals. The estimated distance can be compared to a configured threshold distance that is indicative of a volume associated with a container. A container content item inventory indicative of one or more items included within the volume associated with the container can be determined, wherein an item associated with the RFID tag is included in the container content item inventory based on the estimated distance being less than or equal to the configured threshold distance.

Abstract: Techniques are described for wireless communications. For example, a device can transmit, to passive devices, a transmit signal with a first phase. The device can receive, from each passive device, a respective response signal based on the transmit signal and determine, based on a difference between the first phase and a respective phase of each respective response signal, distances for the passive devices. The device can determine a respective confidence level for each respective distance of each passive device to the device based on a variance of the respective phase of each respective response signal. The device can compare the respective distance of each passive device with each other distance to determine a passive device with a smallest distance. The device can output contextual information based on the passive devices first having the smallest distance, with a confidence level determined for a distance from the passive device to the device.

Abstract: Some disclosed examples pertain to a photoacoustic apparatus that can include a substrate such as a semiconductor substrate, a light source system that includes one or more light-emitting elements on the substrate, and an ultrasonic receiver system that includes an array of micromachined ultrasonic transducer elements on the substrate. The ultrasonic receiver system is configured to detect acoustic waves corresponding to a photoacoustic response of a target object to light provided by the light source system. In some implementations, the photoacoustic apparatus includes an encapsulation layer disposed over the light source system and the ultrasonic receiver system.

Abstract: Sensors and systems for determining a physiological parameter such as blood pressure using external pressure are disclosed. Such sensors and/or systems may be embodied in a wearable user device. The wearable user device may include a cuff configured to apply a pressure to a portion of a user at one or more substantially constant pressure levels; a photoacoustic sensor configured to obtain photoacoustic signals generated from light incident on a blood vessel; and a wearable structure including the cuff and the photoacoustic sensor. Techniques involving the wearable user device may include: obtaining photoacoustic signals from a portion of the user; determining a curve associated with the user, the curve including a plurality of spatial measurements of the blood vessel as a function of a plurality of discrete pressures, the curve enabling determination of a characteristic of the blood vessel; and determining the physiological parameter based at least on the characteristic.

Abstract: Some disclosed examples pertain to an apparatus that can include a platen, a light source system, a receiver system, and an electromagnetic interference (EMI) shield. The light source system can include light source system circuitry, a light-emitting component, and a light guide component having a substantially uniform cross-section. The light-emitting component provides light to an area of the platen via the light guide component. The receiver system can include at least two receiver stack portions residing proximate on either side of the light guide component. The receiver system detects acoustic waves corresponding to a photoacoustic response of a target object proximate the area of the platen, to light emitted by the light source system. The EMI shield shields the receiver system from at least some of the EMI produced by the light source system circuitry. The light guide component conveys light through a portion of the EMI shield.

Abstract: An apparatus may include a platen, a light source system, an ultrasonic receiver system and a control system, the light source system being configured for providing first light and second light having first and second wavelengths to a target object on an outer surface of the platen and including one or more light guides configured to convey light parallel to a surface of the platen. The control system may be configured to: cause the light source system to provide the first light and the second light to the target object at a first time and a second time, respectively; receive first and second ultrasonic receiver signals from the ultrasonic receiver system corresponding to photoacoustic responses of the target object to the first light and the second light, respectively; and estimate one or more blood vessel features based on at least one of the first or the second ultrasonic receiver signals.

Abstract: Some disclosed examples involve receiving ultrasonic receiver signals from an ultrasonic receiver system corresponding to ultrasonic waves generated by a target object responsive to light from a light source system, estimating one or more blood vessel features based, at least in part, on the ultrasonic receiver signals and estimating blood pressure based, at least in part, on the one or more blood vessel features. Some disclosed examples involve receiving inertial sensor data from an inertial sensor system, determining whether the inertial sensor data indicates apparatus motion that exceeds a threshold and controlling a photoacoustic plethysmography (PAPG) system that includes the light source system and the ultrasonic receiver system according to whether the apparatus motion exceeds the threshold.