Ted and oxygen unsaturated hemoglobin; fig. 2 are the emission spectra of the luminescence diodes; fig. 3 is a block diagram of a pacemaker; fig. buy cheap viagra 4 is a circuit diagram of a pacemaker according to fig. 3; fig. viagra viagra online prescriptions 5 is an enlarged illustration of a distal catheter end; fig. cheap viagra online no precription in canada 6 is an illustration similar to fig. 5 with a prism, and fig. generic viagra canada review 7 is an idealized control characteristic line of the pacemaker generator. buy female viagra usa Description of the preferred embodiment the extinction (absorption and scattering) of light of the wavelength 660 nm for human blood is a function of the blood oxygen content thereof (fig. where to buy viagra online uk 1). cheap generic viagra For eliminating interference effects (hematocrit, flow effects), next to the wavelength of 660 nm additionally a reference wavelength of 805 nm is used which are both generated by luminescence diodes. viagra 100mg tablet price As fig. Viagra buy in australia 1 further illustrates, the reflexion of light of the wavelength 805 nm by flowing blood (statistical distribution of the blood corpuscles) is not dependent on the oxygen saturation thereof, in contradistinction to the wavelength 660 nm (intersection of hb and hbo2 curves at 805 nm). After evaluation of both reflexion intensities, as a result the hbo2 saturation of the blood is obtained, with which the frequency of stimulation of the pacemaker is controlled after comparison with a reference value. viagra costco price This in vivo oximetry method avoids practically any zeropoint drifting by virtue of the long-time constant light conductor catheters and luminescence diodes used and thus offers the condition required for the implantability of the pacemaker system controlled by blood oxygen saturation. For a detailled explanation of the circuitry function of the pacemaker, reference is had to figs. viagra gel for sale uk 3 and 4 which illustrate an embodiment by way of example. generic viagra online An oscillator 1 emits about one oscillation per minute in the swung-in condition of the control circuit. From this signal, a monoflop 2 produces a square-wave pulse of a duration of 0. buy viagra online 5. 1 ms. viagra vs viagra qual o melhor This is fed to the driver stage 3 of a luminescence diode 6 with a light wavelength of 660 nm directly, and in a delay member 4 (two monoflops in series, the first one causing the delay and the second regenerating the original pulse) it is delayed by the time ï„ and fed to the driver stage 5 of a luminescence diode 7 with a light wavelength of 805 nm. viagra costco price The light flashes generated in these diodes pass on, time-shifted by ï„ relative to one another, along a common fiber light conductor 8 which is placed transvenously to the right-hand ventricle heart muscle 10. http://nationalityinworldhistory.net/bsh-viagra-non-prescription-alternative-uc/ At the distal catheter end, there is an optical opening 23 from which the light pulses are emitted and are returned reflected by the blood flow 22 via the light conductor 8 to an optical receiver 11. viagra costco price The reflected signals arriving there consecutively are fed to two controlled switches 12 and 13 which are respectively opened by the direct signal and by the signal delayed by ï„ from the monoflop 2 for the duration of the pulse. medicaresupplementspecialists.com/pfz-sale-viagra-rp/ Ordered in this way, the reflexion sig. Differences between viagra viagra und viagra classicmotocrossimages.com/mbs-viagra-cheap-pills-ji/
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