45 results about "Pulsatile blood flow" patented technology

A secondary-emitter sensor position indicator has primary emitters that transmit light having primary wavelengths and at least one secondary emitter that transmits light having at least one secondary wavelength. A detector outputs a sensor signal in response to received light. An attachment assembly, in a sensor-on condition, positions the emitters and detector relative to a tissue site so that the sensor signal is substantially responsive to the primary wavelength light after attenuation by pulsatile blood flow within the tissue site and is negligibly responsive to the secondary wavelength light. The attachment assembly, in a sensor out-of-position condition, positions the secondary emitter relative to the tissue site so that the sensor signal is at least partially responsive to the secondary wavelength.

A disposable active pulse sensor has an emitter that generates optical radiation having a plurality of wavelengths, a detector that is responsive to the optical radiation and an unbalanced electrical motor that vibrates when energized. A tape assembly removably attaches the emitter, the detector and the unbalanced electrical motor to a tissue site. The tape assembly also physically mounts the emitter, the detector and the unbalanced electrical motor in a spatial arrangement so that vibration from the unbalanced electrical motor induces pulsatile blood flow within the tissue site, the emitter transmits the optical radiation into the tissue site and the detector generates a sensor signal responsive to the intensity of the optical radiation after attenuation by the pulsatile blood flow within the tissue site.

An active-pulse blood analysis system has an optical sensor that illuminates a tissue site with multiple wavelengths of optical radiation and outputs sensor signals responsive to the optical radiation after attenuation by pulsatile blood flow within the tissue site. A monitor communicates with the sensor signals and is responsive to arterial pulses within a first bandwidth and active pulses within a second bandwidth so as to generate arterial pulse ratios and active pulse ratios according to the wavelengths. An arterial calibration curve relates the arterial pulse ratios to a first arterial oxygen saturation value and an active pulse calibration curve relates the active pulse ratios to a second arterial oxygen saturation value. Decision logic outputs one of the first and second arterial oxygen saturation values based upon perfusion and signal quality.

The invention is about a permanent total artificial heart device that is developed for the patients who are at the end-stage heart failure and included in the heart transplantation program, and which is placed into the ventricles of the patient's heart completely or placed surgically into the space obtained when a piece of ventricle is removed. The device employs “direct drive technology,” technically using the advantages of brushless electric motors. Special-designed engines require quite little energy for the pulsatile blood flow produced by stopping and starting synchronously with the ECG signals. It is about a permanent total artificial heart device system that will offer high quality of life for many years to the patients as it protects the heart valves and heart conduction system, has wireless charging and longer battery life.

The invention relates to a pulse self-adaptive artificial heart, belongs to the field of biomedical engineering, and relates to an artificial heart which can automatically adapt to heart pulsatile blood flow and reduces heart pump blood hindering. The artificial heart is composed of five parts, namely a diameter-variable blood pump sleeve, a front guide vane, an asymmetric impeller, a sliding shaft and a rear guide vane, wherein the front end of the diameter-variable blood pump sleeve is fixed with the front guide vane; the rear part of the diameter-variable blood pump sleeve is fixed with the rear guide vane; the sliding shaft is arranged between the front guide vane and the rear guide vane; the asymmetric impeller is arranged on the sliding shaft, and can slide forward and backward. The pulse self-adaptive artificial heart has the advantages that the traditional diameter-equivalent blood pump sleeve is replaced by the diameter-variable blood pump sleeve, the traditional symmetric impeller is replaced by the asymmetric impeller, and the impeller of the artificial heart can slide frontward and backward along the sliding shaft under the driving of heart blood flow, so that the automatic adaptability of the artificial heart on the heart pulsatile blood flow is improved, the hindering effect of blood pumping to blood during a systole period is reduced, and the treatment effect of the artificial heart is improved.