Abstract: A medical device and methods for locating the device include a structure having a length dimension and a surface (102). A volume (106) is associated with the surface and extends along a portion of the length dimension. Nanomaterials (108) are incorporated in the volume and configured to be responsive to an excitation signal such that the excitation signal generates a response from the nanomaterials to enable location of the structure within a subject.

Abstract: A method and apparatus for automated detection of a general, non-sinusoidal type of periodicity in ultrasound Doppler signals from pulsatile blood flow is described. The method computes a measure of pulsatility from the power spectrum near the peaks of the fundamental and harmonic frequencies of the Doppler signal information.

Abstract: A method and apparatus for automated detection of a general, non-sinusoidal type of periodicity in ultrasound Doppler signals from pulsatile blood flow is described. The method computes a measure of pulsatility from the power spectrum near the peaks of the fundamental and harmonic frequencies of the Doppler signal information.

Abstract: A medical device and methods for locating the device include a structure having a length dimension and a surface (102). A volume (106) is associated with the surface and extends along a portion of the length dimension. Nanomaterials (108) are incorporated in the volume and configured to be responsive to an excitation signal such that the excitation signal generates a response from the nanomaterials to enable location of the structure within a subject.

Abstract: A vascular flow sensor assembly includes an ultrasound transducer (1-5) which is attached to the body by an adhesive or mechanical substrate to create acoustic coupling between the ultrasound transducer and the body. The assembly includes a force sensor (150) responsive to the attachment force which produces a signal representative of the force of attachment. The signal is detected by a monitoring instrument and used to alert a user to improper attachment of the vascular sensor. In an illustrated embodiment the signal actuates an indicator located on the sensor assembly.

Abstract: An ultrasonic sensor is attached to the body to detect flow in a blood vessel. Signals from the sensor are processed to produce measures of flow during the administration of CPR such as flow velocity and flow pulsatility. The flow measures are compared with flow characteristics desirable during CPR and the result used to produce audible instructions guiding a caregiver in the administration of CPR. The flow measures may be used in conjunction with other detected physiological parameters such as compression force or depth, chest impedance, blood pressure, and ECG data to guide CPR.