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  • 1
    Electronic Resource
    Electronic Resource
    Pacemaker vector cardiograph (1980)
    Springer
    Medical & biological engineering & computing 18 (1980), S. 109-113 
    Details
    ISSN: 1741-0444
    Keywords: E.C.G. ; Frequency modulation ; Isolation amplifier ; Pacemaker ; Vector cardiograph
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442488
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of middle ear pressure with a single transducer and a half-wavelength acoustic transmission line (1981)
    Springer
    Medical & biological engineering & computing 19 (1981), S. 179-184 
    Details
    ISSN: 1741-0444
    Keywords: Acoustic impedance ; Acoustic transmission line ; Middle-ear pressure ; Tympanic membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A simple inexpensive electroacoustic instrument utilising the transforming properties of a half-wavelength acoustic transmission line has been developed for performing a simple screening test of the middle-ear pressure. This device monitors changes in the magnitude of the acoustic impedance of the tympanic membrane as the pressure difference across it is varied. A 25 db h.l. hearing test at 4 kHz is also included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442713
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Noninvasive detection of ventricular wall motion by electromagnetic coupling (1991)
    Springer
    Medical & biological engineering & computing 29 (1991), S. 136-140 
    Details
    ISSN: 1741-0444
    Keywords: Cardiokymography ; Electromagnetic coupling ; Lossy dielectric
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Radiofrequency coils are used as sensors in various applications such as nuclear magnetic resonance (NMR) imaging and displacement cardiograms (DCGs). In most cases the impedance and the resonant frequency of the coil are monitored to provide the required information. The paper describes the changes in reflected impedance and in resonant frequency of a coil when it is placed near a medium with properties ranging from a lossy dielectric to a pure conductor. The theory of interaction between the coil and the medium is investigated and a model based on the use of vector potentials is developed. One prediction of the theory is that placing the coil over body equivalent saline (lossy dielectric) at 15 MHz results in an increase in the inductance of the coil and a resultant decrease in resonant frequency. This prediction was supported experimentally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02447098
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Noninvasive detection of ventricular wall motion by electromagnetic coupling (1991)
    Springer
    Medical & biological engineering & computing 29 (1991), S. 141-148 
    Details
    ISSN: 1741-0444
    Keywords: Cardiokymography ; Electromagnetic coupling ; Left and right ventricular wall motion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The cardiokymograph or displacement cardiograph (DCG) is a non-contacting device which senses movement of the heart throughout the cardiac cycle by the interaction of a radiofrequency (10–20 MHz) electromagnetic field, generated by a sensing coil, with the thorax. In the paper three different techniques of detecting this movement will be discussed: monitoring the changes in sensing resonant frequency (FM modulation), monitoring the changes in impedance of the coil at resonant frequency (AM modulation) and a new technique which monitors the changes in coil impedance at fixed frequency. The sensitivities of these three techniques will be compared. A simplified theory of the mode of coupling between the coil and the thorax will be studied in terms of a transformer model. Preliminary clinical measurements of anterior left and right ventricular motion will be given. The presence of higher-frequency features related to atrial motion and the opening and closing of the aortic and pulmonary values will also be described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02447099
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    An electric tooth pulp vitality tester (1981)
    Springer
    Medical & biological engineering & computing 19 (1981), S. 208-214 
    Details
    ISSN: 1741-0444
    Keywords: Battery powered constant current source ; Electric tooth pulp vitality tester
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A simple battery-powered constant-current pulse generator able to supply up to 200 μA at a maximum of 250 V is described. The tester incorporates a battery status indicator and an overload, incorrect operation and fault condition audible alarm. A simple test routine helps to ensure that the instrument is operating correctly before each application. For enhanced patient co-operation and comfort the tester is activated by the patient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442716
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Automatic read-out device for ultraviolet-radiation polymer-film dosimeters (1980)
    Springer
    Medical & biological engineering & computing 18 (1980), S. 467-473 
    Details
    ISSN: 1741-0444
    Keywords: Automatic read-out device ; Logarithmic ; Polymer film ; Ultraviolet radiation dosimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract An automatic device for measuring the optical absorbance of polymer film used as an ultravioletradiation dosimeter is described. The automated mechanics are based on a commercial slide projector. The ultraviolet radiation is generated by a tungsten quartz-halogen bulb. The optical absorbance is determined by analogue logarithmic circuitry and the resultant value displayed on a digital panel meter. A digital printer or paper-tape punch may be used for hard-copy output. An uncertainty in measurement of 1% is obtained. The device temperature stability is such that this uncertainty can be maintained for analogue circuit temperatures of 20–40°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02443319
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Manual e.c.g. electrode (1979)
    Springer
    Medical & biological engineering & computing 17 (1979), S. 141-141 
    Details
    ISSN: 1741-0444
    Keywords: Manual e.c.g. ; S.T. segment elevation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440971
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    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Calculation and display of the rate/pressure product during anaesthesia using binary rate multipliers (1985)
    Springer
    Medical & biological engineering & computing 23 (1985), S. 187-189 
    Details
    ISSN: 1741-0444
    Keywords: Anaesthesia ; Binary rate multipliers ; Rate/pressure product
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02456757
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    Paper (German National Licenses)
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