Abstract:
An x-ray apparatus for intraoral imaging applications includes a linkage mounted on a support structure, to which is connected an x-ray source for generating x-radiation and directing same to a receiver instrument placed in a patient's mouth. The linkage includes a first arm member, articulated to the support structure and adapted to be pivotable about a substantially vertical axis, a second arm member, connected to the end of the first arm member spaced from the support structure and adapted to be pivotable around a substantially vertical axis and a horizontal axis, and a third arm member, connected to the opposite end of the second arm member and adapted to be pivotable around a substantially horizontal axis, the unsupported end of the latter having the x-ray source mounted thereon with an articulated joint, which allows pivoting of the x-ray source to various positions.
Abstract:
A method and apparatus for performing single-point projection imaging uses an X-ray source and a line scan camera present at a set distance therefrom and provided with a digital detector. The X-ray source, as well as the line scan camera, are adapted to rotate around an object placed between the X-ray source and the line scan camera. The X-ray source's focal spot is aligned at a desired position and the object is then imaged by scanning it with a beam emanating from the X-ray source, which beam is received by the detector of the line scan camera. The scanning motion is effected in such a way that the focal spot remains essentially stationary during the imaging process.
Abstract:
Method of positioning electrodes in an electrode array, comprising at least five or at least seven electrodes for central nervous system (CNS) monitoring from the forehead of a patient's head. The electrodes of the array are optimally located for discriminating EEG, FEMG and EM components from the recorded biopotential signals.
Abstract:
The invention relates to a method and an apparatus for non-dispersive analysis of gas mixtures for determining the concentration of such a first gas component in a gas mixture, whose absorbance may be influenced by other gas components of said gas mixture. The apparatus comprises a sample chamber (2) for containing the gas mixture, a radiation source (1) for transmitting radiation through the gas mixture, a first optical transmission band filter (5) with a first absorption transmission band of the first gas and a first radiation detector (4). The apparatus further comprises a second optical transmission band filter (8) with a second transmission band, which is outside the first transmission band, and a second detector (7). The concentration determining means (23) are arranged to determine the concentration of the first gas using a certain formula or formulas and using the detected intensities. The second transmission band is substantially or entirely outside the absorption bands of said first gas component and comprises a second absorption band of a certain gas component causing a distortion in the absorption band of the first gas component, the strength of the second absorption band being substantially less than the strength of the first absorption band.
Abstract:
A special gas dose delivery unit for respiratory equipment has a special gas flow conduit connected to a special gas source. The unit includes a supply of carrier gas for the special gas, preferably obtained by withdrawing gas from the inspiration limb of the patient breathing circuit. A valve, controllable in accordance with desired special gas dose parameters and the breathing pattern of the patient, injects the special gas into the carrier gas for provision to the outlet conduit of the special gas dose delivery unit. The outlet conduit is connected to the patient limb of the breathing circuit for delivery to the patient.
Abstract:
The invention relates to an arrangement for overfill protection of a container for anaesthetic liquid, comprising a liquid conduit for supplying anaesthetic liquid to a container for vaporization, and a gas conduit for withdrawing a volume of gas equivalent to the filling of anaesthetic liquid from the container. To prevent overfilling of the container, the liquid conduit from a feed point for anaesthetic liquid to the container comprises an inclined duct portion having an inlet through which the anaesthetic liquid is passed to the inclined duct portion and an outlet through which the anaesthetic liquid is passed out from the duct portion and further to the container. A body is positioned in the inclined duct portion such that said body can move in the inclined duct portion from a first position to a second position and vice versa, depending on the inclined position of the container, said body being adapted to move in front of the outlet when the container is tilted and to shut the outlet.
Abstract:
The invention relates to a method and apparatus for temperature compensation in gas analyzer equipment for transient error caused by temperature change. According to the method, a radiation source (1) is used for transmitting electromagnetic radiation through a gas mixture to be analyzed, the intensity of radiation transmitted through the gas mixture being analyzed is detected by means of a thermal detector (4) comprising a radiation detecting sensor element (16) and a reference sensor element (17) for generating an output signal proportional to the concentration of gas being analyzed, the temperature of said thermal detector (4) is measured either directly or indirectly, the measured detector temperature values are recorded as a function of time, and the output signal of the thermal detector (4) is temperature compensated by a correction term dependent on the temperature rate of change (DT) of the thermal detector. According to the invention, the uncorrected output signal V.sub.mass of the thermal detector (4) is temperature compensated by adding a correction term V.sub.comp dependent on the temperature rate of change (DT) of the thermal detector to said output signal.
Abstract:
An apparatus for the regulation of a gas volume delivered to a patient during a respiratory cycle. The apparatus includes at least one valve (9 or 8) for discharging some of the propellant gas flowing from a propellant gas source (4) into a propellant gas chamber (18), the propellant gas chamber (18) being at least partially defined by a wall (17), having a second chamber (19) on the other side thereof. The location of said wall changes as the propellant gas pressure increases in the propellant gas chamber, thus increasing the volume of the propellant gas chamber, the volume of second chamber (19) on the other side of wall (17) diminishing, thus forcing the gas being delivered to a patient to flow towards a patient (21). Thereafter, in order to perform the exhalation of a patient, the propellant gas chamber pressure is allowed to discharge through a valve (9 or 8), whereby the volume of propellant gas chamber (18) diminishes and the volume of second chamber (19) increases as a result of the displacement of the wall (17). Between the propellant gas chamber (18) and propellant gas source (4) is a pressure regulating element (6), capable of regulating the pressure of the propellant gas flowing from the propellant gas source. A method for the regulation of a propellant gas flow to be delivered into a propellant gas chamber (18) and supplied from a propellant gas source (4) by pressure regulation of the propellant gas.
Abstract:
The invention relates to a method and apparatus for applying dynamic nuclear polarization and magnetic imaging to studying an object. As the saturation of an electron spin system required by dynamic nuclear polarization is proceeding, the intensity of a polarizing magnetic field over the object is different from that of a polarizing magnetic field lying over the object during the detection of an NMR signal. The apparatus is provided with means for changing the intensity of a polarizing magnetic field in a manner such that the difference between magnetic field intensities is achieved.
Abstract:
The invention relates to a transfer method and an arrangement for a film cassette unit in a panoramic X-ray apparatus. A film cassette unit (6), comprising a film cassette and cassette aggregate, is transferred either manually or electrically upwards from between patient and operator. After positioning a patient, prior to effecting the imaging, the film cassette unit (6) is lowered or descends automatically down to an imaging position. The transfer can be effected either by turning around a horizontal shaft (9) or by moving in vertical plane.