Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
  • H02M3/00—Conversion of DC power input into DC power output
  • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue
  • A61B5/1468—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue using chemical or electrochemical methods, e.g. by polarographic means

Definitions

• the invention relates to an arrangement for feeding medical probes operated with direct current, in particular polarographic probes, the operating energy being provided by means of alternating current via a voltage-proof coupling from the device side to the probe side.
• Devices of the type described must be connected ungrounded and with a dielectric strength of several KV to the probes attached to the living object in order to safely avoid lethal currents.
• the previous method is not sufficient, particularly when measuring with polarographic probes, because the voltage of the polarographic probe should be monitored and also adjusted during the measurement.
• the use of probes for pH2 measurement and for 02 measurement in alternation is not possible because the oxygen probe is operated, for example, at -700 mV, but the pH2 probe is operated between -100 mV and +100 mV.
• the transmission on the device side can be regulated and the control display on the device side takes place.
• the advantage is that the actual manipulation now takes place on the earthed device side, so that no special control lines have to be routed to the probe via the isolating threshold and that the probe side does not have to be loaded with display devices.
• an AC / DC converter is provided on the probe side, which follows a DC / AC converter on the device side and that the DC voltage can be measured and regulated on the device side.
• two channels can be provided, each with a connection of DC-AC converter, voltage-proof coupling, AC-DC converter, the DC inputs of the converters on the device side being connected to a DC voltage source via a bridge that can be set antisymmetrically Pole of the DC voltage outputs of the converter is connected on the probe side, the second poles are each connected to a load resistor via a protective diode and the probe is connected to the connections between the load resistor and the diode.
• the radio frequency is limited to the voltage-proof transition and prefabricated electronic modules can be used for this.
• the operating voltage for the probe can be changed from - to + and vice versa.
• FIG. 1 an arrangement for regulation with a sign
• FIG. 2 an arrangement with alternating signs
• FIG. 3 a further arrangement for Regulation with changing sign.
• 100 is a * direct current / alternating current converter / alternating current / direct current converter combination, coupled via a voltage-proof coupler 102, for example a toroidal transformer.
• a voltage source V supplies a voltage which can be set by a regulator R and which can be measured by means of the display A.
• the voltage set in this way is depicted on the probe side SS, so that the connected probe S can be adjusted on the device side GS without the need for measurement lines to be routed across the voltage-proof threshold, which, not shown, is arranged between the two converters.
• a high-frequency generator 101 is set in frequency by a DC voltage at the input in FIG. It is therefore possible to use a conventional constant voltage to alternating voltage converter.
• the high frequency is supplied to a pair of filters 201, 202, the filter frequencies of which are slightly below the center frequency and somewhat above the center frequency of the high voltage generator 101.
• the voltage 0 is formed when the frequency of the generator 101 is exactly in the middle between the filter frequencies of the filters 201, 202, and has a negative sign when the frequency approaches the lower filter frequency, a positive sign Sign when it approaches the upper filter frequency.
• a capacitor 204 filters out the radio frequency.
• the paths 103, 104 and 105, 106 each represent a channel that corresponds to a DC-DC converter with a voltage-proof isolating threshold 102 Potentiometers between which the set voltage is also measured.
• the grinders are connected in anti-parallel.
• the output terminals are connected to combinations 300, 301 and 302, 303 of a load resistor and a protective diode, and the voltage is removed at the connection points 304, 305 and the probe S is thus operated.
• the output voltages are also adjusted.
• the relative voltage between switching points 304.305 is 0 if the wipers of potentiometers R1, R2 are in the middle. It changes its sign when the grinders are turned after one or the other stop.

Landscapes

• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Medical Informatics (AREA)
• Animal Behavior & Ethology (AREA)
• General Chemical & Material Sciences (AREA)
• Biophysics (AREA)
• Pathology (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Chemical & Material Sciences (AREA)
• Molecular Biology (AREA)
• Surgery (AREA)
• Optics & Photonics (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Power Engineering (AREA)
• Endoscopes (AREA)
• Electrotherapy Devices (AREA)
• Surgical Instruments (AREA)
• Measurement Of Resistance Or Impedance (AREA)
• Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
• Dc-Dc Converters (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6711774

Family Applications (1)

Country Status (6)

Families Citing this family (1)

Citations (3)

Family Cites Families (2)

• 1980
  • 1980-09-29 GB GB8127443A patent/GB2094480A/en not_active Withdrawn
  • 1980-09-29 JP JP55502499A patent/JPS57501715A/ja active Pending
  • 1980-09-29 WO PCT/DE1980/000153 patent/WO1982001123A1/de not_active Ceased
  • 1980-09-29 EP EP19800902051 patent/EP0060833A1/de not_active Withdrawn
• 1981
  • 1981-09-28 FR FR8118256A patent/FR2490947A1/fr active Granted
  • 1981-09-28 DK DK428081A patent/DK428081A/da not_active Application Discontinuation

Patent Citations (3)

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