Abstract: A method and apparatus for determining cardiac time intervals that can measure physiological data noninvasively. Arterial pulse values are measured either invasively or noninvasively, from which left ventricular waveform data is generated. Systolic and diastolic time intervals are derived based on the left ventricular waveform data.

Abstract: A system that simplifies remotely accessing data retrieved from an apparatus. The system has an application development framework that allows an application developer to design specific applications using generic implementation information in the application development framework. The system may utilize a dedicated-function appliance separate from the apparatus or be embedded within the apparatus.

Abstract: A method and apparatus for determining cardiac time intervals that can measure physiological data noninvasively. Arterial pulse values are measured either invasively or noninvasively, from which left ventricular waveform data is generated. Systolic and diastolic time intervals are derived based on the left ventricular waveform data.

Abstract: The present invention is a method for calculating blood pressure of an artery having a pulse. The method includes applying a varying pressure to the artery. Pressure waveforms are sensed to produce pressure waveform data. Waveform parameters are derived from the sensed pressure waveform data. Blood pressure is then determined using the derived parameters.

Abstract: The present invention is a method for calculating blood pressure of an artery having a pulse. The method includes applying a varying pressure to the artery. Pressure waveforms are sensed to produce pressure waveform data. Waveform parameters are derived from the sensed pressure waveform data. Blood pressure is then determined using the derived parameters.

Abstract: A hand-held non-invasive blood pressure measurement device allows a varying pressure to be applied to an artery while pressure waveforms are sensed to produce pressure waveform data. Waveform parameters are derived from the sensed pressure waveform data. Blood pressure is then determined using the derived parameters. The user is guided or prompted to apply the varying pressure through audible and visual feedback.

Abstract: A non-invasive blood pressure sensor includes a first fluid filled sensing chamber having a diaphragm. A first transducer is fluidly coupled to the first sensing chamber to sense fluid pressure within the first chamber. A flexible body conformable wall surrounds the sensing chamber. The wall applies force to the artery while preventing pressure in a direction generally parallel to the artery from being applied to the sensing chamber. The flexible body conformable wall includes a second fluid filled chamber. A second transducer fluidly coupled to the second chamber senses fluid pressure within the second chamber. As varying pressure is applied to the artery pressure waveforms are sensed by the first transducer. Using output signals of the first and second transducers, the sensed pressure waveform data is analyzed to derive waveform parameters from which blood pressure values are derived. The effects of motion artifacts are reduced by the use of signals from both the first and second transducers.

Abstract: A blood pressure measurement device with a sensor locator for placing a non-invasive blood pressure measurement device over an underlying artery, the sensor locator having a plurality of extending fingers spaced from each other coupled to the non-invasive blood pressure measurement device.

Abstract: A non-invasive blood pressure sensor includes a first fluid filled sensing chamber having a diaphragm. A first transducer is fluidly coupled to the first sensing chamber to sense fluid pressure within the first chamber. A flexible body conformable wall surrounds the sensing chamber. The wall applies force to the artery while preventing pressure in a direction generally parallel to the artery from being applied to the sensing chamber. The flexible body conformable wall includes a second fluid filled chamber. A second transducer fluidly coupled to the second chamber sensing fluid pressure within the second chamber. As varying pressure is applied to the artery pressure waveforms are sensed by the first transducer. Using output signals of the first and second transducers, the sensed pressure waveform data is analyzed to derive waveform parameters from which blood pressure values are derived. The effects of motion artifacts are reduced by the use of signals from both the first and second transducers.

Abstract: The present invention is a method for calculating blood pressure of an artery having a pulse. The method includes applying a varying pressure to the artery. Pressure waveforms are sensed to produce pressure waveform data. Waveform parameters are derived from the sensed pressure waveform data. Blood pressure is then determined using the derived parameters.

Abstract: A method for determining blood pressure of an artery includes the steps of applying a pressure to the artery, sensing pressure data produced by the artery and deriving parameters for the sensed pressure data. The parameters are utilized for generating a first blood pressure value estimate using a first function of the parameters based upon a first range of pressure values and by generating at least one second blood pressure estimate using at least one second parameter function based upon a second blood pressure estimate using at least one second parameter function based upon a second pressure range different from the first pressure range. A blood pressure value is determined based upon the first blood pressure estimate and said at least one second blood pressure estimate.

Abstract: A method for determining blood pressure of an artery includes the steps of applying a pressure to the artery, sensing pressure data produced by the artery and deriving parameters for the sensed pressure data. The parameters are utilized for generating a first blood pressure value estimate using a first function of the parameters based upon a first range of pressure values and by generating at least one second blood pressure estimate using at least one second parameter function based upon a second blood pressure estimate using at least one second parameter function based upon a second pressure range different from the first pressure range. A blood pressure value is determined based upon the first blood pressure estimate and said at least one second blood pressure estimate.

Abstract: A hand-held non-invasive blood pressure measurement device allows a varying pressure to be applied to an artery while pressure waveforms are sensed to produce pressure waveform data. Waveform parameters are derived from the sensed pressure waveform data. Blood pressure is then determined using the derived parameters. The user is guided or prompted to apply the varying pressure through audible and visual feedback.

Abstract: The present invention is a method for locating a sensor over an underlying artery having a blood pulse. The sensor is positioned at a plurality of locations above a known appoximate location of the artery while applying a constant hold down pressure to the artery. The sensor is finally positioned at the location which exhibits the largest maximum pressure ampltiude.

Abstract: The present invention is a method for locating a sensor over an underlying artery having a blood pulse. The sensor is positioned at a plurality of locations above a known approximate location of the artery while applying a constant hold down pressure to the artery. The sensor is finally positioned at the location which exhibits the largest maximum pressure ampltiude.

Abstract: The present invention is a method and apparatus for calculating blood pressure of an artery having a pulse. The method includes applying a varying pressure to the artery. Pressure waveforms are sensed to produce pressure waveform data. Waveform parameters are derived from the sensed pressure waveform data. Blood pressure is then determined using the derived parameters. The apparatus is a blood pressure monitoring device which includes pressure means for applying a varying pressure to the artery so that the artery exhibits pressure data, sensing means for sensing the pressure data, signal producing means connected to the sensing means for producing output signals corresponding to the sensed pressure data and processing means for receiving the output signals from the signal producing means, for deriving a plurality of parameters using sensed pressures and for determining a blood pressure value using the derived parameters.

Abstract: A method for determining blood pressure of an artery includes the steps of applying a pressure to the artery, sensing pressure data produced by the artery and deriving parameters from the sensed pressure data. The parameters are utilized for generating a first blood pressure value estimate using a first function of the parameters based upon a first range of pressure values and by generating at least one second blood pressure estimate using at least one second parameter function based upon a second pressure range different from the first pressure range. A blood pressure value is determined based upon the first blood pressure estimate and said at least one second blood pressure estimate.

Abstract: A sensor having a sensing surface for sensing blood pressure within an underlying artery of a patient includes a transducer, a sidewall, a flexible diaphragm and a fluid coupling medium. The sidewall is distinct from transducer and supports the transducer above the underlying artery. The fluid coupling medium is coupled between the sensing surface of transducer and the flexible diaphragm and transmits blood pressure pulses within the underlying artery from the flexible diaphragm to the sensing surface of transducer. In one embodiment, the fluid coupling medium is isolated from sidewall.

Abstract: A method for identifying an onset of a first heart beat includes sensing blood pressure over time to produce a plurality of blood pressure samples, each sample having a corresponding blood pressure amplitude in time, identifying a post onset point in time following an onset of the first heart beat and preceding an onset of a second heart beat, and identifying an onset of the heart beat based upon the blood pressure samples and the post onset point.

Abstract: A sensor for sensing blood pressure within an underlying artery as the underlying artery is compressed includes a transducer and a compressible sidewall. The transducer senses blood pressure of blood pressure pulses as the pulses travel beneath the sensor. As each blood pressure pulses crosses an edge of the sensor, each pulse exerts a force on the sensor in a direction parallel to the underlying artery. Tissue surrounding the underlying artery also exerts a force. The compressible sidewall is distant from the transducer and engages tissue surrounding the underlying artery. The compressible side wall neutralizes the force exerted by the tissue surrounding the underlying artery and dampens the force parallel to the underlying artery so that a substantially zero pressure gradient exists across the transducer.