Abstract: The present invention relates to an ear simulator representing an average acoustic ear drum impedance of ears of a population of humans. Another aspect of the invention relates to an ear simulator assembly comprising an ear simulator representing average acoustic ear drum impedance and a detachable ear canal simulator to provide an ear simulator assembly representing an acoustic impedance of a human ear canal or average human canals of the population.

Abstract: The present invention relates to an ear simulator representing an average acoustic ear drum impedance of ears of a population of humans. Another aspect of the invention relates to an ear simulator assembly comprising an ear simulator representing average acoustic ear drum impedance and a detachable ear canal simulator to provide an ear simulator assembly representing an acoustic impedance of a human ear canal or average human canals of the population.

Abstract: A delivery device for a monomer may include an elongate container designed to enclose one or more ampoules containing the monomer. The elongate container may include: a connection at a first end of the elongate container for delivering the monomer to a mixing device, pre-filled with a polymer, for preparation of bone cement composition under vacuum; a cap at a second end of the elongate container; at least one air inlet aperture in a wall of the elongate container; and a manually actuatable element for opening the one or more ampoules. The manually actuatable element may include: a knob; a draw rod; and one or more spikes. The knob may be in threaded engagement with the draw rod. An end of the draw rod may extend past the one or more ampoules. Turning the knob may cause the one or more spikes to penetrate the one or more ampoules.

Abstract: A method and an arrangement for successively feeding batches into a mixing vessel under partial vacuum for the preparation of bone cement. The arrangement includes an inner container communicating with the atmosphere and with the mixing vessel, which container is so arranged as to enclose a glass ampoule containing a liquid bone cement component and, on the other hand, a device for opening the ampoule so that its contents can be sucked into the mixing vessel under partial vacuum. An outer container encloses the inner container at least partially, and is arranged to communicate with the mixing vessel. The inner container, and the outer container, define a space filled with a proportional quantity of a second bone cement component, which is in powder form.

Abstract: The invention relates to a delivery device for a monomer and comprises an elongate container (2). This is designed to enclose at least one ampoule containing the monomer. At one end the container (2) has a connection (2a) for delivering the monomer to a mixing device, pre-filled with a polymer, for the preparation of bone cement under vacuum. At its other end the container (2) has a cap (2b). In the container wall there is an air inlet aperture (2c). There are also manually actuatable elements for opening at least one ampoule (3a, 3b). The cap (2b) is removable from the container (2) and has holding elements (3) designed by means of a positively interlocking engagement to hold fast an ampoule neck (3a1, 3b1) inserted into the said holding elements 3. The said opening elements comprise a knob (4), which is in threaded engagement (4a) with a draw rod.

Abstract: The invention relates to a device in a mixing vessel (1) intended for the preparation of bone cement and comprising a mixing bowl (3) provided with tightly sealing lid (2). Rotatably supported in the lid (2) is at least one mixing element (4, 4?, 4?), which is designed to sweep over substantially the whole internal chamber of the mixing bowl (3) in order to carefully mix the two constituents of the bone cement with one another. There is, furthermore, a connection to a vacuum source in order to create a vacuum in the chamber of the bowl (3) in connection with the preparation. One of the constituents of the bone cement may be situated in the internal chamber prior to preparation and the other may be delivered to the said chamber via an aperture in the lid (2) by means of the vacuum prevailing in the internal chamber. The device further comprises a drive member operatively connected to the mixing element.

Abstract: A method and a device for preparation of bone cement. The constituent components of bone cement are mixed under vacuum in a closed mixing chamber, which has a vacuum connection (4), a moveable wall section (2), a device arranged to maintain the moveable wall section (2) in its initial position during the mixing process, an extrusion opening located opposite to the moveable wall section (2) and a device (9) arranged to openably seal the extrusion opening. The extrusion is performed by the moveable wall section (2) being brought to move towards the extrusion opening, by applying a force against the moveable wall section (2) using an extrusion tool (12). The moveable wall section (2) is set free after mixing is finished and thereafter forced towards the extrusion opening for compression of bone cement while the extrusion opening is sealed by the sealing device (9).

Abstract: The present invention relates to a method and a device for preparation of bone cement. The constituent components of bone cement are mixed under vacuum in a closed mixing chamber, which has a vacuum connection (4), a moveable wall section (2), a device arranged to maintain the moveable wall section (2) in its initial position during the mixing process, an extrusion opening located opposite to the moveable wall section (2) and a device (9) arranged to openably seal the extrusion opening. The extrusion is performed by means of the moveable wall section (2) being brought to move towards the extrusion opening, by applying a force against the moveable wall section (2) by means of an extrusion tool (12). The present invention is characterized in that the moveable wall section (2) is set free after finished mixing and thereafter forced towards the extrusion opening for compression of bone cement while the extrusion opening is sealed by the sealing device (9).

Abstract: The present invention relates to a device at an apparatus for preparing and extrusion of bone cement. The apparatus comprises a mixing chamber (1) equipped with a vacuum connection (2) and has a, in the opposite part of the mixing chamber (1), moveable wall section (6) arranged to be pushed into the mixing chamber (1) after preparation under vacuum and then to extrude bone cement through an extrusion opening arranged in the opposite part of the mixing chamber (1). The invention is characterized in that the moveable wall section (6) is sealingly connected with a corresponding end of the mixing chamber (1) in such a way that the connection is breakable when applying a for breakage sufficient force to the moveable wall section (6).

Abstract: The present invention relates to an arrangement for the manufacture of bone cement by mixing together its constituent components comprising a mixing cylinder (1) in the form of a tube with a bottom (2) and a lid (3) and inside the mixing cylinder an axially movable agitator (4). The agitator consists of a piston-like agitator disc (4a), which is perforated by channels (4a1), through which the components of the bone cement are caused to flow during the mixing procedure and an agitator rod (4b) resembling a piston rod operatively connected to the agitator disc (4a) and supported in the lid (3) in such a way that it is free to slide. The invention is characterized in that the agitator rod (4b) has an axial channel (4b1), which is closed off at the agitator disc (4a) in such a way that it is capable of being opened.