Abstract: The invention relates to a medical x-ray imaging apparatus which includes a support construction (1) supporting a substantially ring-shaped structure (2), an O-arm (2), which in turn supports imaging means (21, 22) and which O-arm (2) is arranged with an examination opening (4). The imaging means (21, 22) are arranged movable within the O-arm (2). The apparatus is arranged with a patient support handlebar (5), which is arranged to be positioned in at least a first and a second position of which in the first position the patient support handlebar (5) functions as a patient support handlebar and in the second position it has some other function.

Abstract: The invention relates to an arrangement and method in digital mammography imaging especially for use for imaging of small breasts. In the invention, a so-called full-field sensor and an upper compression plate substantially equal in width with this sensor are used. According to the invention, the beam is limited to a width narrower than the width of the sensor and the compression plate and directed for oblique imaging non-centrally relative to the center of said sensor and the upper compression plate, while the automatic exposure system of the imaging apparatus is caused to adapt itself for imaging in accordance with this imaging position non-central relative to the sensor and the upper compression plate.

Abstract: The object of the invention is a method and an apparatus for adjusting mutual position of two structural elements of a patient chair, like the back rest and the head rest, articulated with each other, in which method the mutual position of the two structural elements (3, 4, 5) connected with each other by articulation is adjusted by a drive device (13). With the help of the drive device (13) it is possible to produce, for example, an essentially high rotational motion that can be converted to a linear motion with the help of a thread. The linear motion is converted to an essentially slow rotational motion with the help of a thread element (9) functionally connected to an articulated shaft (6, 7) belonging to the position adjustment mechanism.

Abstract: Mammography imaging apparatus according to the invention contains e.g. an essentially vertically standing body part and an arm structure in connection with it, being turnable with respect to a horizontal rotating axis, a radiation source on one hand and image data receiving means on the other hand being located at essentially opposite ends of the arm structure. The arm structure includes at least two arm parts orientating essentially parallel and means for changing mutual orientation of at least the first and the second of the said at least two arm parts, first means for turning the said first arm part around a horizontal axis and second means arranged to the said second arm part with help of which, when turning the said first arm part, it is possible both to maintain orientation of the said second arm part with respect to the said first arm part and to turn the said second arm part in a different direction and/or at a different angular velocity with respect to the movement of the said first arm part.

Abstract: The object of the invention is a method and an apparatus for adjusting mutual position of two structural elements of a patient chair, like the back rest and the head rest, articulated with each other, in which method the mutual position of the two structural elements (3, 4, 5) connected with each other by articulation is adjusted by a drive device (13). With the help of the drive device (13) it is possible to produce, for example, an essentially high rotational motion that can be converted to a linear motion with the help of a thread. The linear motion is converted to an essentially slow rotational motion with the help of a thread element (9) functionally connected to an articulated shaft (6, 7) belonging to the position adjustment mechanism.

Abstract: Mammography imaging apparatus according to the invention contains e.g. an essentially vertically standing body part and an arm structure in connection with it, being turnable with respect to a horizontal rotating axis, a radiation source on one hand and image data receiving means on the other hand being located at essentially opposite ends of the arm structure. The arm structure includes at least two arm parts orientating essentially parallel and means for changing mutual orientation of at least the first and the second of the said at least two arm parts, first means for turning the said first arm part around a horizontal axis and second means arranged to the said second arm part with help of which, when turning the said first arm part, it is possible both to maintain orientation of the said second arm part with respect to the said first arm part and to turn the said second arm part in a different direction and/or at a different angular velocity with respect to the movement of the said first arm part.

Abstract: The invention relates to methods and arrangements for disinfection of water lines of a dental unit, wherein the water lines are filled with a strong chemical, which is allowed to act in the lines for a desired length of time. Firstly, the invention improves the safety of use of such chemicals by realizing the arrangements of the dental unit so as to limit the chances of the user inadvertently admitting the chemical to where it should not be admitted, e.g. into the patient's mouth or into a public water distribution system. Secondly, said arrangement is so implemented as to allow more effective disinfection of the main valve of the water system of the dental unit, the disinfection chemical being supplied via a point upstream of the main valve. The arrangement is so implemented that supply of chemical can not be started before an on-off valve or equivalent placed upstream of the feed point has been closed, and this valve can not be opened before the chemical has been removed from the water lines.