摘要:
A hip-joint prosthesis includes a shaft which is configured to be inserted into the femur and whose surface has an osteoinductive finish. This finish is provided exclusively in the metaphyseal portion of the shaft and laterally from the line delineating the maximum antero-posterior dimension of the shaft cross section. This ensures a better involvement of the metaphyseal spongiosa in the flow of forces, without compromising the ability to per-form follow-up surgery on the prosthesis.
摘要:
Cervical intervertebral prosthesis with at least one cover plate (3, 4) to be connected to one of the two adjacent vertebral bodies (1, 2), and with a securing plate (12) which secures this cover plate (3, 4) and is to be fastened to the ventral surface of the vertebral body (1, 2). According to the invention, the securing plate (12) is a separate part unconnected to the cover plate (3, 4). It can be biodegradable.
摘要:
In order to improve a multiple-spindle turning machine comprising a machine frame, two cylinders arranged on opposite sides of an operating area and mounted on the machine frame to be respectively rotatable around an essentially horizontal rotational axis, machining means arranged on the cylinders in respective individual positions with central axes aligned essentially parallel to the rotational axis, and tools for machining work pieces held in at least one portion of the machining means, in such a way that it may also be used as universally as possible for other work pieces, it is proposed that the cylinders are rotatable around their rotational axis independently of one another relative to the machine frame.
摘要:
The invention relates to acridanone derivatives of the formula ##STR1## wherein the dotted line is an optional bond, R.sup.1 is hydrogen, halogen or nitro,R.sup.2 is hydrogen or lower alkyl,one of R.sup.3 and R.sup.4 is hydrogen or lower alkyl and the other together with R is an additional bond,A is lower alkylene,R.sup.5 is a 5-membered nitrogen-containing, optionally lower alkyl-substituted aromatic heterocycle, amino or the group ##STR2## the symbol is a 5- or 6-membered, optionally lower alkyl-substituted saturated heterocycle which can contain as a ring member oxygen or sulfur or the group >NH or >N(B).sub.n --A.sup.1 --R.sup.6, B is the group --CO--, --COO-- or --SO.sub.2 --, n is the number 0 or 1, A.sup.1 is lower alkylene, R.sup.6 is hydrogen, amino, lower alkylamino or di(lower alkyl)amino and R.sup.7 is hydrogen or lower alkyl, and pharmaceutically acceptable acid addition salts thereof, their preparation and pharmaceutical compositions based thereon.
摘要:
A multiple-spindle machine tool or a multi-speed transmission wherein the spindles or shafts carry several fluid-operated aggregates in the form of clutches, brakes and/or work clamping devices which receive pressurized fluid by way of axially movable spools mounted in or surrounding the respective spindles or shafts. The spools are movable axially by a stationary cam (in a machine tool) or by an indexible cam (in a transmission), and receive pressurized fluid which is admitted axially or radially, depending upon whether the spools are received in or surround the respective spindles or shafts.
摘要:
An automatic lathe wherein the carriage for an indexible tool turret is biased against a stop and can be moved toward the work spindle by a rotary cam which is driven by a hydraulic motor and is arrested by a hydraulic brake when the carriage reaches a selected position. The motor is automatically decelerated to crawling speed prior to complete stoppage of the cam and the brake is applied subsequent to deceleration of the motor and simultaneously with opening of an arresting valve which connects the supply and return conduits for the motor. The supply conduit continues to receive some pressurized fluid while the motor is at a standstill. Abrupt acceleration of the motor is prevented by maintaining the arresting valve in open position after a motor valve increases the rate of fluid flow from a pump to the supply conduit and by closing the arresting valve simultaneously with disengagement of the brake.
摘要:
A hydraulic double acting chuck motor comprising a hollow cylinder and piston mounted at the rear end of a working spindle of a lathe operates a collet or chuck by pushing or pulling on a hollow operating shaft. The chuck motor is arranged in an enclosed housing attached to the rear end of the head stock of the lathe and which is fitted with a drainage connection. The hollow piston of the chuck motor is operatively controlled through a hollow cylinder extension attached to the cylinder and which is provided with a pair of fluid supply ducts, each of which communicates with a chamber of the chuck motor. The ducts open on the outer peripheral surface of the cylinder extension. A slidable annular collar surrounds the cylinder extension and defines therewith an annular space. The collar is connected by a conduit to a source of fluid under pressure and is axially shiftable by a control means into communication with one or the other of the openings to the ducts leading to the chambers of the chuck motor.
摘要:
A finger joint prosthesis includes a joint body 14 having first and second joint elements pivotably connected about an axis of rotation and anchoring bars 30, 32 extend from the joint body for securing to a proximal and a distal phalanx. The anchoring bars 30, 32 include one or more securing eyes 40, 42, 44 with openings for receiving fixing screws therein. To provide improved primary and secondary fixing, an end securing element is provided distally from the axis of rotation on the anchoring bar 30, 32 of at least one joint element.
摘要:
In order to improve a lathe, in particular, a multiple-spindle lathe, comprising at least one workpiece spindle arranged on a machine frame and rotatable about a spindle axis, this workpiece spindle projecting with its front end into an operating area, and a tool slide with a longitudinal slide element guided for displacement in Z-direction parallel to the spindle axis in a longitudinal guide means located outside the operating area and arranged on a slide stand of the machine frame and with a cross slide arranged in the operating area and displaceable in X-direction transversely to the spindle axis in relation to the longitudinal slide element, this cross slide being guided on a cross slide guide means arranged at a front end of the longitudinal slide element and movable by means of a cross feed gear, such that the tool slide as a whole is constructed in as space-saving a manner as possible and, in particular, requires little space in the operating area in order to create the possibility of using several tool slides on one workpiece spindle, it is suggested that the longitudinal slide element bear a cross feed motor for the cross feed gear in an area located outside the operating area and that this cross feed motor drive the cross feed gear by means of a rotary transmission element extending in a longitudinal direction of the longitudinal slide element.
摘要:
In order to improve a multiple-spindle turning machine, comprising a machine frame, a cylinder rotatable around an essentially horizontal rotational axis relative to the machine frame, work piece spindles arranged on the cylinder in respective individual positions with spindle axes, which are aligned essentially parallel to the rotational axis and which during the machining of a work piece are movable relative to the cylinder by means of linear drives in the direction of their spindle axis and independently of one another, and tools arranged on tool supports for machining the work pieces held in the work piece spindles, in such a way as to allow the respective work piece spindle to be positioned as precisely as possible in the direction of its spindle axis, it is proposed that each of the work piece spindles is allocated its own linear drive disposed on the cylinder to move it in the direction of the spindle axis, and that the work piece spindle is constantly coupled to the linear drive.