Luer lock-type connector.

p0001The invention relates to a connecting portion with an outer cone for a lockable conical joint for medical devices, in which the outer cone is surrounded by a loose nut concentrically, which consists of a sleeve with an internal right thread.

p0002The outer cone of a connecting member is assembled with an inner cone of a second link member, and it is to lock the conical joint, the cylindrical sleeve of the threaded nut screwed on to the radially outwardly extending straight or inclined wing the free end of the inner cone. Such as these connections are known as a Luer-lock connections. The inner right-hand thread of the sleeve extends in known connecting parts over the entire axial length of the sleeve and DIN standard according faces the tip of the Au ßenkegels several millimeters beyond the front edge of the sleeve to the outside. The supernatant of the outer cone on the sleeve is because that is generally not enough space for a long sleeve nut of the outer cone connection portion is on the inner cone-connecting part is available, so that to obtain a dense plug of outer cone and inner cone by axially pulling in the outer cone in the inner cone while screwing the nut has to be longer on the inner cone connection of the external taper as the sleeve of the threaded nut. This applies both to fixed as well as loose on the outer cone attached to nuts. The supernatant of the outer cone tip on the sleeve with the result that with removed connectors accidental contact of the outer cone to the contamination of its top results. This touching occurs in practice often and correctly has the whole instrument, eg an infusion set, be discarded and replaced by a new instrument.

p0003It is known to provide a lockable conical connection with a stopper for the rear end of a pipe with an outer cone, which is shorter than the specified connected to it the threaded nut (DE-GM 83 03 358) sleeve. However, this stopper with very short outer cone does not meet the standard and does not fit into any inner cone connection parts of medical devices. It is only suitable for special applications, with an inner conical joint part, the inner cone is also very short.

p0004DE-OS 29 47 574 C2 discloses a connecting member having an outer cone which is surmounted by a fixedly connected to it sleeve whose inner wall has no threads in the region of its free edge and is designed as a sealing surface, the most by an elastomer element on the outer periphery of the foot the inner cone cooperates. Also in this case there are special parts that are adapted to one another and the connecting part with outer cone is not suitable for coupling with standard connectors with inner cone.

p0005In a double clutch according to US-A-43 69 781 an inner cone and an outer cone are directed to opposite sides and concentrically surrounded at a distance by stationary sleeves. The sleeve of the outer cone is shorter than this and includes an inner right-hand thread for the Luer-lock with radial wings on the end of an inner cone part. The sleeve of the inner cone projects above this and carries at its free edge a disk with radial tabs that hold a hitched outer cone part clamping. For usual standard cone connections this double-clutch is on its inner side cone likewise unsuitable and on its outer cone of the outer cone is not adequately protected by the sleeve.

p0006To achieve a contamination protection a pipe section according to DE-GM 81 25 057 has been attached to the nut, which is longer than the on the front edge of the threaded nut protruding outer cone and arranged retractable to allow the concentration of positive and negative connecting parts on the threaded nut backwards is. With this construction is not reliably ensured that the outer cone tip is not affected contaminating yet retracted, piece of pipe or in its withdrawal before the cone connection is established.

p0007The invention has the object of providing a standardized connecting part with outer cone in such a way that the tip of the outer cone is reliably protected from contamination by contact.

p0008This object is achieved in that the sleeve is longer than the outer cone and that the right-hand thread is formed in the front portion of the sleeve and the rear portion of the sleeve includes a left-hand thread, with the cooperating an outer annular collar of the outer cone.

p0009When delivered, the collar of the outer cone is at the rear end of the left-hand thread of the sleeve and the tip of the outer cone is withdrawn behind the front edge of the sleeve in this. The front end of the sleeve so is well above the top of the outer cone outward and protects against accidental contact and contamination. When assembling the connecting part with outer cone with every standard connection part with inner cone the right threaded sleeve is screwed onto the wings of the inner cone-connecting member, thereby causing the interaction of the collar with the left-hand thread of the sleeve a retreat from the sleeve relative cone to the outer so that its front edge is displaced behind the tip of the outer cone. In the coupled state of both connecting portions of the long outer cone is deep and sealed in the long inner cone and by laying the front edge of the sleeve behind the outer cone tip is screwed onto the inner plug connection part sleeve portion short so that the joint portion without space and sealing problems with all standard , standardized connectors with inner cone can be coupled. The structure is simple and can be produced by injection molding of Praise.

p0010In an advantageous embodiment of the invention provides that the collar has on its circumferential surface a left-hand thread portion and that radial locking projections are formed for holding the annular collar at the rear end of the left-hand thread open at both ends sleeve. The left-hand thread portion of the collar has its centered leadership on the collar result that favors in the clockwise rotation of the sleeve, a tilt-free pulling in the outer cone in the inner cone. On delivery is the collar between two latching projections, which are arranged at an axial distance equal to the axial thickness of the collar about. The radial extension of the locking projections is large enough to secure the sleeve against slight axial movement of the collar, but low enough to allow for screw adjustment of the sleeve its axial movement.

p0011The sleeve is open at both ends. This is required so that the collar of the rear side can be screwed up to snap between the locking projections in the left-hand thread. The terminal locking projection is radially thicker than the inner latching projection, so that no accidental disconnection of the sleeve is prevented by the outer cone and upon actuation of the threaded nut facilitated overcoming the inner latching projection is possible.

p0012In the drawing an embodiment of the invention is shown schematically. Show it:<ul><li>Fig. 1 is a longitudinal sectional view of a connecting part with a male taper in the delivery state and</li><li>FIG. 2 shows the connecting part of Figure 1 with coupled inner cone connection part.</li></ul>

p0013A connecting member 10 made of a harder plastic material consists essentially of an outer cone 11 with a cylindrical channel 12 and a threaded nut in the form of a cylindrical sleeve 13 with internal threads. The sleeve is open at its front end 14 and at its rear end 15 without narrowing and the internal thread in its cylindrical interior is composed of two axially successive sections, namely a front multispeed right hand thread 16 and a rear multi-speed left-hand thread 17 same or similar slope , The right-handed thread 16 is used for screwing on the sleeve 13 to radially outwardly directed wing 22 of a connection member 20 with internal taper 21, which connects to a fluid-carrying channel, for example an infusion set, (Fig.2). The outer cone 11 is surrounded at its rear end by an outer annular collar 18, whose outer diameter is adapted to the inner diameter of the sleeve 13 and having on its cylindrical peripheral surface of a left-hand thread section 19 which cooperates with the left-handed thread 17 of the sleeve. 13 The annular collar 18 extends substantially in a plane which is perpendicular to the longitudinal axis of the outer cone eleventh When delivered in accordance with Figure 1, the annular collar 18 between two radial locking projections 25, 26 is held on the inside of the sleeve 13, the axial distance between the axial thickness of the annular collar 18 is about. The rear opening 15 nearer end-side locking projection 25 is in the radial direction is slightly higher than the inner latching projection 26 can also be provided a plurality of latching projections distributed circumferentially.

p0014For assembling the link member 10 of Figure 1 is clockwise screwed on the left-hand threaded portion 19 of the annular collar 18, the sleeve 13 until the annular collar 18 between the two latching projections 25, 26 in the region of the rear end of the left-handed thread 17 engages. It provides the end-side locking projection 25 has a higher resistance than the shallower inner latching projection 26. In this initial state, the tip of the outer cone 11 is retracted into the sleeve 13, ie, a portion of the sleeve length covers the tip of the outer cone 11 and protects it from contamination by contact , The right-hand thread 16 extends from the front opening 14 of the sleeve 13 in the region of the retracted tip of the outer cone 11th

p0015Is to be assembled for preparing a compound of the tapered connecting portion 10 with the connecting part 20, the sleeve 13 is screwed with the right-hand thread 16 by turning on the wing 22 of the connecting part 20th The clockwise rotation causes this 13 these displaced by the interaction of the left-hand thread portion 19 of the annular collar 18 of the outer cone 11 with the left-handed thread 17 of the sleeve to the rear, so that the tip of the outer cone 11 vortritt through the opening 14 of the sleeve 13 forward. In the coupled state (FIG. 2), the usual in the standard connection parts picture with its tip over the front edge of the sleeve projecting, deeply penetrating into the inner cone outer cone and a relatively short screwed onto the inner plug connection part sleeve length. Results The rather large length of the sleeve 13 is effective only in the unused state of the link member 10 to protect the outer cone 11 and is pulled back in the coupled state that any obstacle to the tight contraction of outer cone and inner cone by axial space constraints on standardized inner cone connection part occurs.

p0016The outer cone connection part may alternatively comprise a plug-like closed outer cone so that it does not produce fluid line, but the end of a line by means of their internal taper connection part tightly closes.