DE3105929A1 - Connection device for the connection of two tubular components to one another - Google Patents

Description

Dipl.-Ing.

Rolf Chewier

Patent attorney

RehhngcnfrafJe 8 · P.O. Box 2M)

D-8900 Augsburg 31

Telephone 08 21/36015 + 3 6016

Telex 533275

PHsiM'hcikknnui Munich No. 1 ^ 4? S ¹ J-SUl

3230/113 / Ch / Ha -4- Augsburg, February 10, 1981

Smiths Industries Limited Cricklewood Works

GB-London NW2 6JN

Connection device for connecting two tubular components to one another

The invention relates to a connecting device for connecting two tubular components to one another.

The connecting device is primarily intended to be used in the medical field. It should therefore be particularly suitable _/ to connect a syringe to a cannula of small diameter.

The problem arises here, a pipe with a very small diameter, such as a having to connect an epidurate or intravenous cannula with a tube part of large diameter. Here it must be ensured that the connecting device that the small diameter pipe is liquid-

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holds tight.

There is therefore the task of the connecting device to be designed in such a way that it is simple and compact in structure and has a liquid-tight connection to one manufactures easily removable tubular component.

This object is achieved with the features of claim 1, advantageous embodiments are the Subclaims can be found.

The liquid-tight hold between the connecting device and the one tubular component takes place through the contact of the elastomeric component over the entire circumference of the tubular component. The angular rotation is decisive here for the force with which the wall of the through hole rests against the tubular component. By the rotation of the elastomeric component causes this component to lengthen, which leads to that the inner diameter of the through hole is reduced and thus the inner wall of this through hole against the surface of the tubular component, which is in this through hole was introduced.

Exemplary embodiments are explained in more detail below with reference to the drawings. Show it:

1 shows a cross section through a first embodiment of the connecting device;

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2, 3 and 4 are perspective views of the parts the device;

5 and 6 end views of two further embodiments of the connecting device and

7 shows a view of a further embodiment of the device.

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The connecting device consists of three components, an outer, front, tubular component 1 made of rigid plastic, an inner intermediate part 2 made of an elastic, rubber-like material and an outer, tubular rear component 3, also made of rigid plastic material. A cannula 4 can be pushed into the connecting device from the front end and is held tight by turning of the front part 1 relative to the rear part 3. The rear part 3 enables the connection with the frustoconical nose 5 of a syringe 6.

The front part 1 has a substantially cylindrical outer surface with flat sides 7 and 8 (Fig. 2) The front end of this front part has a beveled edge 10 and a conical opening 11, the latter opening into the interior 12 of this component. The interior 12 is substantially cylindrical formed and has such a shape that it is able to receive the front end of the intermediate part 2. At the rear, the front part 1 is provided with a cylindrical nose 15, which has a reduced Has outer diameter and which extends into the front end of the rear part 3. In front of the nose 15, the outer surface of the front part 1 has two pawl-like handles extending backwards Teeth 16 on. Each tooth 16 has a straight edge which runs along the curved surface of the part 1 extends, as well as a curved edge which runs around the part 1 between the two teeth. The teeth 16 act as pawls, as will be described later.

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The front part 1 also has a frustoconical shape. ge Bore 17, which extends from the interior 12 of the part 3 to the outside. At the opposite of the bore 17 On the side, the front part has a cylindrical blind hole 18.

The intermediate part 2 is essentially H-shaped (FIG. 3) with a cylindrical central part 20 which extends with a close fit in the interior 12 of the front part 1. The middle part 20 ends at the front end with a protruding part 21, one end 22 being arranged with a tight fit in the frustoconical bore 17, while the other end 23 engages in the blind bore 18 in a corresponding manner. The rear end of the intermediate part 2 is designed accordingly with a protruding part 24 which is arranged with a close fit in the rear part 3. _{An axial bore 25 /} which is aligned with the bore 11 runs through the intermediate part 2.

The rear part 3 has a cylindrical outer surface with flat sides 26 and 27 on (Fig. 4). The front end of the rear part 3 surrounds the nose

15 of the front part 1. At the front end of the rear part 3 are two teeth extending forward 30 integrally formed, which are in engagement with the teeth

16 of the front part 1. The rear part 3 is hollow on the inside (reference number 31), so the inside is after Open at the front and designed so that the rear end of the intermediate part 2 can be received there.

For this purpose, the rear part 3 has a truncated cone-shaped bore 32 in which the corresponding shaped end 33 of the rear protruding

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Part 24 is arranged. The inner surface of the rear portion 3 accordingly has a cylindrical blind bore 34 which receives ₅ to the other end 35 of the rear protruding part of the 24th A short bore 36 extends rearwardly from the interior 31 and is aligned with the bore 25 through the intermediate part 2. The bore 36 of the rear part 3 has the same diameter as the bore 25 of the intermediate part 2 and is in communication with the frustoconical bore 37 via an inwardly directed annular lip 38. The frustoconical bore 37 widens in the direction of the rear end of the rear part 3 and this bore 37 is arranged in the interior of a cylindrical part 39 of reduced diameter.

The cannula 4 is inserted into the bore 25 until it rests against the lip 38 and is in the bore 25 held with a press fit. To achieve this interference fit, the rear part 3 is clockwise relative to the Front part 1 rotated so that the inclined edges of the teeth 16 and 30 move against each other, whereby Front and rear part are moved away from each other against the force of the intermediate part 2nd front part 1 and rear part 3 are rotated 180 ° relative to each other. Starting from the position according to the 2 to 4 snap the teeth 16 and 30 together in the next position after a 180 ° rotation. The middle part 20 of the intermediate part 2 is in this way around 180 twisted. This twisting of the intermediate part made of an elastomer material causes a twist

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extension of this intermediate part along its axis. The extension along the axis caused in the middle part 20 of the intermediate part 2 then consequently leads to a reduction in the diameter of the bore 25, which thus lies around the cannula 4. The extension caused in the intermediate part 2 enables contact with the outer surface of the cannula 4 over a considerable length of this cannula. The extension produced also causes the front part 1 and the rear part 3 to be slightly separated from one another when they are rotated relative to one another, unless the intermediate part 2 is kept under axial tension in the non-rotated state. Provided that teeth 16 and 30 are large enough, this separation will not affect the operation of the connector.

The connecting device keeps the cannula 4 liquid-tight fixed when the teeth 16 and 30 mesh in a rotated state. Depending on the type of intermediate part 2, the connecting device can hold the catheter in place by rotating it through a larger angle becomes, such as over 360 ° or 450 °. To remove of the cannula 4, the front part 1 and the rear part 3 are pulled away from one another until the tips of the teeth 16 and 30 no longer touch each other, so that as a result of the elasticity of the intermediate part 2, the two parts 1,3 can turn back to their original position. The connecting device is preferably manufactured by Insert the two parts 1 and 3 into one another and inject the intermediate part 2. Here, a cylindrical Mandrel axially through the front part and the rear part 3

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guided, which then defines the bore 25 through the intermediate part 2. After the dome has been inserted, a rubber solution is poured in via one or both bores 17 or 32. When the rubber solution has set _r then the mandrel is removed and the intermediate part 2 is finished.

The connecting device can be modified in various ways. For example, a larger number of teeth are provided or the teeth are sewn together so that the angle of rotation which is required to connect the connecting device to a pipe is reduced. In order to be able to hold the front part 1 to the rear part 3 in the rotated position, are also Alternative solutions possible. The two parts can, for example, on the abutting edges be crenellated. Lock by pulling apart and turning the two parts relative to each other then the two parts in the rotated position together. In each case, the training is to be carried out in such a way that that the interacting surfaces of the two parts 1,3 latch with one another in the rotated state or lock.

The intermediate part can also have modified shapes. The intermediate part 2 does not necessarily need Have Η-shape. It should only have a shape in which a non-rotatable connection with parts 1 and 3 is given. The intermediate part can, for example, have an essentially dumbbell-shaped shape have with enlarged cylindrical end parts,

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the surfaces of which are provided with projections or depressions which engage with corresponding ones Depressions or protrusions on the inner surfaces of parts 1 and 3. The intermediate part 2 can also be manufactured separately and then can be assembled together with parts 1 and 3. It is possible here, the intermediate part under axial To maintain tension to prevent lengthening of the intermediate part as a result of twisting the two parts 1 and 3 separate from each other.

With the connection device it is also possible to connect two pipes of the same diameter to one another associate. For this purpose, the two tubes are inserted into the bore 25 from opposite ends on both sides introduced until they butt against each other. Turning the front part relative to the rear part then lays down the wall of the bore 25 of the intermediate part to the outer surfaces of the butting pipe ends.

The flat sides 7 and 8 of the front part 1 and the flat sides 26 and 27 of the rear part 3 make it easier to grip and rotate the two parts. The outer The surface of the connecting device can also be of a different shape in order to allow rotation and axial separation of the two parts 1 and 3 to facilitate. For example the two parts 1 and 3 can have an oval shape, as shown in FIG. Alternatively the two parts 1 and 3 can be circular

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Have cross-section and with axially extending grooves 40, as shown in FIG. The axial separation of the two parts 1 and 3 can be facilitated are made by providing annular grooves 41 as shown in FIG.

The bore 25 through the intermediate part 2 can also have a ribbed surface in order to seal To improve fit with the surface of the tube that extends through this bore.

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Claims (10)

Oipl.-Ing. Roif Churner iSc S · Postfach> (> Augsburg 31 lcL-fon OS 21 / 3ήθ 15+ 3-6016 Telex 533275 ι · ■ -. ..-. Ν. Μ .. \ ΐ · ..κ ..; η ν 454 '^. Η, ιι An κι .: Smiths Industries Ltd.: 230 / I13 / Ch / Ha Augsburg, February 10, 1981 claims 1. Connection device for connecting two tubular Components with one another, characterized in that they are an elastomer component (2) with a through hole (25) into which a first tubular component (4) can be inserted is that the elastomeric component (2) has a first portion (21), which to a second Section (24) is rotatable about the axis of the through hole (25) that the device has two locking parts (16,30), which are connected to the sections (21,24) and the elastic component (2) is twisted Keep state. 2. Connecting device according to claim 1, characterized in that the first and second Sections (21,24) are arranged at opposite ends of the elastomeric component (2). 3. Connecting device according to claim 1 or 2, characterized in that g e k e η η ζ e i c h η e t that with the first section (21) a front outer part (1) and lüit -2- 130065/06 B7 3230/113 / Ch / Ha -2- February 10, 1931 the second section (24) has a rear outer Part (3) is connected and the elastomeric component (2) is arranged inside the two parts (1,3). 4. Connecting device according to claim 3, characterized in that the elastomeric Component (2) is essentially tubular and deviates from the tubular shape at its ends Sections (21,24) which in corresponding recesses (17,18,32,34) of the front part (1) and the rear part (3) engage. 5. Connecting device according to claim 3 or 4, characterized in that the front part (1) and the rear part (3) have locking parts in the form of interacting ratchet teeth (16,30) which after rotation of the two parts (1,3) lock together. 6. Connecting device according to claim 5, characterized in that the ratchet teeth (16.30) are arranged offset from one another by 180 °. 7. Connecting device according to one of claims 3 to 6, characterized in that the front part (1) and the rear part (3) on their Have flattened surfaces (7,8,26,27) on the outside. 8. Connecting device according to one of claims 1 to 7, characterized in that the -3- 130065/0657 8230/113 / Ch / Ha -3- February 10, 1981 first tubular component (4) through the entire length of the through hole (25) of the elastomer Component (2) extends. 9. Connecting device according to one of claims 1 to 8, characterized in that at one end of the device a frustoconical bore (37) is arranged. 10. Connecting device according to one of claims 3 to 7, characterized in that the elastomeric component (2) by filling in the front part (1) and the rear part (2) in the assembled State is formed. -4- 130065/0657