Abstract: Software-configurable battery monitoring and management systems and methods provide flexibility in selecting the location where the highest voltage in a block of cells is sensed so as to support control boards to connect to any number of cells. In certain embodiments, battery management is accomplished by measuring cell voltages in a block of cells in a battery stack, determining whether the battery stack comprises a bus bar, determining a sum of the individual cell voltages, and comparing the voltage at the top of a battery stack, including any bus bar, to the sum of the individual cell voltages to obtain a comparison result that may be used to perform a diagnostic procedure.

Abstract: An analog front-end circuit for self-calibrating a comparator, the circuit comprising a comparator in a comparator measurement path; a preamplifier coupled to the comparator by a set of switches; and an amplifier coupled to the preamplifier, the preamplifier receiving a reference signal as a first input and a user-definable reference as a second input, the user-definable reference generating a user-definable value chosen to create a known condition at an output of the preamplifier, the preamplifier determines a residual value that represents a measurement error in a signal path comprising the comparator and is used to adjust the user-definable reference value to calibrate the signal path such that threshold boundaries for the comparator can be adjusted to tighten a comparator specification.

Abstract: Described herein are systems and methods that allow for automatic detection of the highest available cell voltage and/or location of the top voltage in a battery stack, in real-time, without having to use separate, dedicated PCBs for different battery stack configurations, and without having to manually configure PCBs based on the number of cells each battery stack has. In certain embodiments, automatic detection is accomplished by a software-configurable battery management circuit that supports any battery pack size without the need to perform hardware modifications or the added cost of customizing boards for battery stacks that have different numbers of cells. In addition, a novel diode-OR analog multiplexer circuit allows the chip to be powered prior to the selection of the top cell.

Abstract: A patient interface includes a cushion having a body with a front portion and a rear portion. The front portion has a lower opening structured to receive a flow of a treatment gas and a coupling mechanism. The rear portion is structured to engage a user's face and provide a generally continuous seal therewith. The patient interface further includes a frame having a torus shaped portion defining an opening. The opening has at least a portion of the coupling mechanism disposed therein.

Abstract: Described are systems and methods take advantage of properties of sinc filters that remove frequency components at specific integer multiples of a noise frequency. In various embodiments, sampling of multi-channel systems at sufficiently high rates allows for removal of unwanted signals and harmonics from multi-sample sequences. Advantageously, a multi-sample sequence scheduling scheme eliminates the need for noise filtering one channel at a time at each channel's own sampling rate using a separate filter.

Abstract: A cushion member for a patient interface device that includes a main body portion including a plurality of chambers and a self-sealing cap portion coupled to the main body portion. The cap portion covers each of the chambers and forms a plurality of membrane members, with each membrane member being positioned over and sealing a respective one of the chambers. The cap portion is made of a self-sealing material such that that each of the membrane members is structured to self-seal responsive to having a needle inserted through and pulled out of the membrane member. Also, an apparatus and a method for selectively adjusting the internal pressure of the chambers of such a cushion.

Abstract: Described are systems and methods take advantage of properties of sinc filters that remove frequency components at specific integer multiples of a noise frequency. In various embodiments, sampling of multi-channel systems at sufficiently high rates allows for removal of unwanted signals and harmonics from multi-sample sequences. Advantageously, a multi-sample sequence scheduling scheme eliminates the need for noise filtering one channel at a time at each channel's own sampling rate using a separate filter.

Abstract: An analog front-end circuit for self-calibrating a comparator, the circuit comprising a comparator in a comparator measurement path; a preamplifier coupled to the comparator by a set of switches; and an amplifier coupled to the preamplifier, the preamplifier receiving a reference signal as a first input and a user-definable reference as a second input, the user-definable reference generating a user-definable value chosen to create a known condition at an output of the preamplifier, the preamplifier determines a residual value that represents a measurement error in a signal path comprising the comparator and is used to adjust the user-definable reference value to calibrate the signal path such that threshold boundaries for the comparator can be adjusted to tighten a comparator specification.

Abstract: Described herein are systems and methods that allow for automatic detection of the highest available cell voltage and/or location of the top voltage in a battery stack, in real-time, without having to use separate, dedicated PCBs for different battery stack configurations, and without having to manually configure PCBs based on the number of cells each battery stack has. In certain embodiments, automatic detection is accomplished by a software-configurable battery management circuit that supports any battery pack size without the need to perform hardware modifications or the added cost of customizing boards for battery stacks that have different numbers of cells. In addition, a novel diode-OR analog multiplexer circuit allows the chip to be powered prior to the selection of the top cell.

Abstract: Described herein are systems and methods for real-time fault detection in electrical circuits. Various embodiments provide a fault detection circuit that uses a resistor network that is controlled to detect an internal current leak in multiple directions, e.g., to ground or to a power supply. The magnitude of the leakage current may be estimated from voltage measurements at voltage pins. In addition, as part of circuit diagnostics, open and short circuit fault conditions may be identified by using current sources and measuring deflections at the voltage pins.

Abstract: Software-configurable battery monitoring and management systems and methods provide flexibility in selecting the location where the highest voltage in a block of cells is sensed so as to support control boards to connect to any number of cells. In certain embodiments, battery management is accomplished by measuring cell voltages in a block of cells in a battery stack, determining whether the battery stack comprises a bus bar, determining a sum of the individual cell voltages, and comparing the voltage at the top of a battery stack, including any bus bar, to the sum of the individual cell voltages to obtain a comparison result that may be used to perform a diagnostic procedure.

Abstract: A cushion member for a patient interface device that includes a main body portion including a plurality of chambers and a self-sealing cap portion coupled to the main body portion. The cap portion covers each of the chambers and forms a plurality of membrane members, with each membrane member being positioned over and sealing a respective one of the chambers. The cap portion is made of a self-sealing material such that that each of the membrane members is structured to self-seal responsive to having a needle inserted through and pulled out of the membrane member. Also, an apparatus and a method for selectively adjusting the internal pressure of the chambers of such a cushion.

Abstract: A cushion member (12, 12?, 12?) for a patient interface device (4) that includes a main body portion (34) including a plurality of chambers (48) and a self-sealing cap portion (36) coupled to the main body portion. The cap portion covers each of the chambers and forms a plurality of membrane members (52), with each membrane member being positioned over and sealing a respective one of the chambers. The cap portion is made of a self-sealing material such that that each of the membrane members is structured to self-seal responsive to having a needle inserted through and pulled out of the membrane member. Also, an apparatus and a method for selectively adjusting the internal pressure of the chambers of such a cushion.

Abstract: A patient interface device (8) includes a cushion member (16) structured to engage a face of a patient when the patient interface device is donned by a patient, and a frame assembly (14), wherein the cushion member is coupled to the frame assembly. The frame assembly including a main frame member (18) having a plurality of pocket members (32) provided therein, and a plurality of peg members (20) coupled to the main frame member, wherein each peg member includes an arm member (42) that is received and held within a respective one of the pocket members at a user selectable position, and where in movement of the peg members relative to the main frame member adjusts a size and/or shape of the patient interface device.

Abstract: A patient interface includes a cushion having a body with a front portion and a rear portion. The front portion has a lower opening structured to receive a flow of a treatment gas and a coupling mechanism. The rear portion is structured to engage a user's face and provide a generally continuous seal therewith. The patient interface further includes a frame having a torus shaped portion defining an opening. The opening has at least a portion of the coupling mechanism disposed therein.

Abstract: A patient interface assembly comprises a patient interface device for communicating a gas to a patient and headgear comprising a strap arrangement for securing the patient interface device against the face of the patient. A hair grip device (30) is provided for coupling the headgear to the hair of the patient.

Abstract: A cushion member (12, 12?, 12?) for a patient interface device (4) that includes a main body portion (34) including a plurality of chambers (48) and a self-sealing cap portion (36) coupled to the main body portion. The cap portion covers each of the chambers and forms a plurality of membrane members (52), with each membrane member being positioned over and sealing a respective one of the chambers. The cap portion is made of a self-sealing material such that that each of the membrane members is structured to self-seal responsive to having a needle inserted through and pulled out of the membrane member. Also, an apparatus and a method for selectively adjusting the internal pressure of the chambers of such a cushion.

Abstract: A patient interface device (8) includes a cushion member (16) structured to engage a face of a patient when the patient interface device is donned by a patient, and a frame assembly (14), wherein the cushion member is coupled to the frame assembly. The frame assembly including a main frame member (18) having a plurality of pocket members (32) provided therein, and a plurality of peg members (20) coupled to the main frame member, wherein each peg member includes an arm member (42) that is received and held within a respective one of the pocket members at a user selectable position, and where in movement of the peg members relative to the main frame member adjusts a size and/or shape of the patient interface device.