Abstract:
A heat exchanger strip (19) which can be incorporated into a heat and moisture exchanger (10). The heat exchanger strip (19) includes an elongate polymer film having a longitudinal axis, a front and a back surface and a first and second edge (27, 29) generally parallel to the longitudinal axis of the strip (19). A plurality of elongate curved spacers (24) are connected to the polymer film. Each spacer (24) can include a curved longitudinal axis and first and second edges (27, 29) disposed on opposite sides of the longitudinal axis of each spacer (24). The edges (27, 29) are generally parallel to the longitudinal axis of the spacer (24). Spacers (24) can be connected to the front surface of the film such that the spacer's longitudinal axes extend generally parallel to each other between the first edge (27) of the strip (19) and the second edge (29) of the strip (19) to define three sides of a curved rectangular flow channel (28). The heat exchanger strip (19) can be disposed in a spiraling, generally cylindrically spaced roll such the heat exchanger strip (19) is arranged in generally concentric layers with the back surface of the polymer film defining a fourth side of the flow channel (28).
Abstract:
An apparatus (10) is provided for controlling discharge of oxygen from an oxygen supply source (12) to a patient. The apparatus includes an oxygen supply inlet (47), a pressure regulator (14) coupled to the oxygen supply inlet and configured to reduce pressure of oxygen received from the oxygen supply inlet to a selected magnitude, a flow controller (16) coupled to the pressure regulator (14) and configured to meter oxygen received from the pressure regulator at a selected flow rate, and an oxygen distribution assembly including a pneumatic demand oxygen valve (18) and a conduit (51) conducting oxygen discharged from the flow controller through the pressure regulator to the pneumatic demand oxygen valve for delivery to a patient. The flow controller (16) includes a chamber (110) and a rotary valve (112) for splitting oxygen discharged from chamber (110) into a first stream in an oxygen supply passageway (51) for use by a patient and a second stream in a diaphragm supply passageway (48) for controlling operation of pneumatic demand oxygen valve.
Abstract:
Motion compensation is based on analysis of intensity signals received by detectors, without separately measuring a motion signal, without providing feedback to cancel the motion signal and without attempting to mathematically eliminate the motion signal. Instead, the present invention mathematically recognizes the presence of the motion signal and recognizes a few key characteristics of the motion signal and makes corresponding assumptions. First, it is recognized that the motion/noise in each wavelength signal is proportional. Second, it is assumed that the blood pulse signal is not affected by motion.
Abstract:
An apparatus of and method for measuring arterial blood oxygen saturation at a particular tissue level of interest. Visible and near infrared radiation is emitted into a patient at the measurement site using two different wavelengths. Detection at two different detection sites permits rejection of oxygen saturation at undesired tissue levels.
Abstract:
A system for delivering a supply of pressurized gas to a user may include a blower and a noise suppression portion. The blower may include an intake portion and an outlet portion for supplying the pressurized gas to the user. The noise suppression portion may define a conduit therethrough having an intake portion and an outlet portion in communication with the intake portion of said blower. The noise suppression portion may be moveable between a first configuration and a second configuration such that at least one exterior dimension of the device is reduced when the noise suppression portion is moved from the first configuration to the second configuration.
Abstract:
A medical ventilation device comprising a cannula (102) having proximal (104) and distal ends (106); an inflatable cuff (110) adapted to be inflated to an inspiratory pressure, the cuff (110) attached to and surrounding a portion of the cannula (102) toward the distal end thereof ; an inspiratory pressure inflation tube (118) having first and second ends, the first end in communication with an interior of the inflatable cuff (110), the second end adapted to communicate with an inspiratory pressure source; and a pressure valve (330) in communication with the inspiratory pressure inflation tube (118).
Abstract:
A technique is provided for processing a physiological signal. The technique includes performing one or more multi-resolution decompositions on a physiological signal and one or more morphological operations on some or all of the respective decomposition components. In one embodiment, the technique is implemented as iteratively wavelet transformations where morphological operations, such as erosions and dilations, are applied to modify some or all of the respective wavelet coefficients. The modified wavelet coefficients may then be reconstructed to generate a clean version of the physiological signal from which some or all of the noise and/or artifacts have been removed.
Abstract:
A medical sensor may be adapted to account for factors that cause irregularities in pulse oximetry measurements or other spectrophotemetric measurements. Sensors are provided with surface features that reduce the amount of outside light or shunted light that impinge the detecting elements of the sensor. The sensor is adapted to reduce the effect of outside light or shunted light on pulse oximetry measurements.
Abstract:
A clip-style sensor is provided that includes a sliding clip, such as a flat spring that slides along the sensor to provide a closing force for the sensor. When the sliding clip is engaged, the sensor is secured to the patient. The sensor may be placed on a patient's finger, toe, ear, and so forth to obtain pulse oximetry or other spectrophotometric measurements.
Abstract:
A sensor for physiological constituent detection may be adapted to include a mucoadhesive. A sensor is provided that is appropriate for use on mucosal tissue. The mucoadhesive provides a mechanism for holding the sensor on the mucous membrane in order to measure physiological constituent levels in the tissue and blood.