JPS6346317B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cannula comprising two connecting members provided with nipples or tubes and adapted to ensure mutual engagement by means of respective outer and inner cones provided on these members. ,catheter,
It relates to a device for connecting flexible tubes, etc.

Connecting devices in which complementary outer and inner conical portions are inserted into each other to create a sealing connection are known as the so-called Luer syringe system. However, when making the connection, there is a risk that the parts to be interconnected may become sterile due to being touched by hand or in some other manner. Moreover, air contamination may occur due to the inflow of air.

Even in the case of known coupling devices, it cannot be guaranteed that the two conical coupling parts cannot be unintentionally uncoupled from one another. For example, if a coupling device is used to connect an infusion tube to a vein and the connection between the infusion tube and the intravenous catheter is unnoticed and becomes disconnected, air embolism may occur. Blood spillage can also lead to bacterial infections during long-term use.

It is therefore an object of the present invention to provide a coupling member which is protected from contamination due to contact with hands or non-sterile objects before, during and after the coupling, and which communicates with the patient's veins. An object of the present invention is to provide a connecting device that automatically closes when the connection between members is inadvertently broken, thereby reliably preventing air from flowing into the veins and venous blood from overflowing.

According to the invention, the first coupling member with a conical inner surface has a radial circumferential groove in which a valve disk of elastomeric material is held which prevents penetration and has a slit; Another connecting member connecting the conical portion to the protective sleeve concentrically surrounding the conical portion has an inner diameter larger than the outer diameter of said first connecting member having an inner conical portion and connecting to the connecting nipple; supporting an outer cone forming an annular groove with a length deeper than the insertion length of the outer cone, when the outer cone is in the connected state inserted into the inner cone, the outer cone partially covers the valve disk; It becomes possible to pass through the slit and open the slit.

According to a further embodiment of the invention, the inner surface of the through passage of the first coupling member with an inner cone is provided with a radial circumferential groove in which an elastomeric material is provided which prevents penetration and has a central slit. a valve disc is retained, there is a guide between the valve disc and the inner cone for a tubular member, the tubular member being axially displaceable between the valve disc and the inner cone; Its front end is arranged in front of the plane plate in its retracted position, and in its extended position passes partially through this plane plate to open the slit, the outer conical part being inserted into the inner conical part and causing this. the outer cone protrudes into said guide by the distance that the tubular member must protrude in order to open the valve disk, the other coupling member being a collar on the outside of the tubular part having the outer cone; Via this it is possible to connect this tube section to a protective sleeve that concentrically surrounds it at certain distances and projects beyond it. In the coupling device according to the invention, the conical coupling parts are protected from contact by hands or non-sterile objects, i.e. the conical coupling parts are covered on the one hand by a protective sleeve and on the other hand inside the tube part. This is because it is placed in In the coupled state, both coupling members are protected from contamination by encapsulating a protective sleeve. If the connection is disconnected or disconnected,
The displaceable tubular member is in a retracted position in which the slit in the valve disk is closed so that the connecting member associated with the displaceable member is closed by a hermetic, liquid-tight seal. If the coupling device is inadvertently separated, the valve disk automatically assumes a closed position in which it forces the axially displaceable member into the retracted position.

According to a particularly advantageous embodiment of the invention, the tube part with an internal cone, which is inserted into the protective sleeve, comprises:
The outer surface has an annular groove in which an O-ring of elastomeric material is fitted, and the protective sleeve engages with and protects the O-ring when the outer and inner conical sections are interconnected. Deform elastically. This O-ring not only contributes to a better connection between the two interconnecting parts, but also allows the gap between itself and the conical connection to be filled with disinfectant. If the protective sleeve and both connecting members are made of transparent material, the disinfectant solution can be seen from the outside. Since the disinfectant solution will not leak, sterility will be reliably maintained.

The tubular portion having an inner cone includes at its end a cylindrical portion having a diameter greater than the maximum diameter of the inner cone, the cylindrical portion adjoining the inner cone via a shoulder. is desirable.
With this structure, the inner cone is located inside the tube part and at a depth that is out of reach, thereby preventing the inner cone from being accidentally touched and contaminated.

In a further embodiment of the invention, the tubular part with an internal conical part is covered, until the connection is made, with a protective cap having a cylindrical part corresponding to the cylindrical part of the protective sleeve. Also in this case,
The O-ring maintains the sterility of the components located inside the coupling device throughout its production and storage period prior to subsequent use. To make the connection, it is only necessary to remove the protective cap and replace it with a connecting member with a protective sleeve. It is clear that a connecting element comprising an external cone and a protective sleeve can likewise be protected from contamination until it is connected by covering it with a cap or closing element.

The axially displaceable member may be a tubular member having ribs uniformly distributed on its cylindrical surface and extending along its generatrix. Since the tube member is guided and supported through these ribs, the friction associated with displacement of the member is reduced. Moreover, the part of the member facing the valve disk preferably tapers conically so that this member facing the valve disk engages the disk at a position closer to the center. This can help spread the slit provided in the valve disk.

FIG. 1 will be explained. The first coupling member 1, which is provided with an inner cone 5 and is connected to a catheter or cannula which reaches the patient's body during injection, consists of a front part 2 with a coupling nipple 3 and a rear part 4 with an inner cone 5; These two parts are inserted into each other and welded. In the assembled state of the front part 2 and the rear part 4, a radial circumferential dovetail groove 6 is formed in the joining area of both parts to retain a disc-shaped valve disk 7 of elastomeric material. In addition, the valve plate 7 is
It is provided with a star-shaped slit 8 terminating at the front face of its rim.

The front part 2 of the coupling member 1 is provided with a central passage 9 having the largest diameter in the area where the valve disc 7 is present.

The connecting nipple 3 into which the flexible tube is pushed has a frangible part 11 which closes the through passage 9. Since the connecting nipple 3 has a conical outer surface, the connecting pipe can be press-fitted into the nipple 3. The connecting nipple 3 is partially surrounded by a tubular part 12, and an annular groove 13 is formed between the tubular part 12 and the connecting nipple 3.

The rear section 4 is generally tubular and includes a rear cylindrical section 15 that adjoins the inner cone 5 via a shoulder.

The outer surface of the front part 2 is provided with a radial circumferential groove 21 into which an O-ring 22 of elastomeric material is fitted.

The protrusion 23, which is a component of the tightening joint, is attached to the rear portion 4.
installed on the outer surface of the

A second connecting member 24 is connected to the first connecting member 1 . The coupling member 24 consists of a tube section 27 with an external conical coupling section 28 at the front thereof. The front end of the external cone 28 includes a conically tapered tip 20 that partially passes through the valve disk 7 in the coupled state. The pipe portion 27 includes a through passage 30,
In the illustrated connected state, this passageway 30 extends and opens into the passageway 9 of the coupling member 1 .

The protective sleeve 32 is connected to the tube section 27 at a section 31 . Between the protective sleeve 32 and the outer cone 28 an annular section 33 is formed, in which a rear cylindrical section 15 with an inner cone 5 is arranged after the two connecting parts have been connected. become.

An insert member 16 having a star-shaped cross section and adjoining the axial guide pin 17 is held in the through passage 9 of the coupling member 1 . The guide pin 17 is press-fitted into the central recess 18 of the frangible part 11 . The flexible part 11 is connected to the connecting nipple 3 via a frangible line 19.

When the frangible part 11 is separated from the coupling nipple 3 by bending the frangible part 11 along the frangible line 19, the guide pin 17 is pulled out away from the recess 18 so that an annular outflow opening is formed. will be done.

Next, FIG. 4 will be explained. Inner conical part 10
5 and which is connected to a catheter or cannula which reaches the patient's body during injection, consists of a front part 102 with a connecting nipple 103 and a rear part 104 with an internal cone 105, both of which are inserted into each other and welded. When the front section 102 and the rear section 104 are assembled, a radial circumferential dovetail groove 106 is formed in the joint area of the two sections to retain a disc-shaped valve disk 107 of elastomeric material. In addition, valve board 107
has a central slit 108 terminating in front of the rim on each end thereof.

The front part 102 of the coupling member 101 is provided with a central passage 109 which has its largest diameter in the vicinity of the valve disk 107 and which, via a truncated cone, in the vicinity of the nipple 103, for example of the cannula to be coupled. It has a reduced diameter corresponding to the diameter.

Nipple 103 includes a frangible portion 111 that closes through passageways 109,110. Connected nipple 103
Since its outer surface is conical, the connecting pipe can be pushed into the nipple 103. The connecting nipple 103 is partially surrounded by a tube section 112,
An annular groove 113 is formed between the tube portion 112 and the connecting nipple 103. A longitudinal groove 114 is provided on the outer surface of the tube section 112 surrounding the nipple. To connect the flexible tube to the nipple,
The front part 102 can be firmly gripped by this longitudinal grooved part, and the flexible tube can be inserted into the nipple 10 until its front end is inside the annular groove 113.
3. Can be pushed on top. Optionally, the rear portion of the tube 112 may be provided with two to four flats to facilitate its gripping.

The rear portion 104 is generally tubular and includes a rear cylindrical portion 115 that adjoins the inner cone 105 via the shoulder. The inner conical portion 105 also includes the cylindrical guide portion 11
6, but since the diameter of the cylindrical guide 116 is larger than the minimum diameter of the inner cone 105, a step 117 is formed at the transition from the inner cone to the cylindrical guide. . This step 117
form an abutment surface for the tubular member 118, which has longitudinally extending ribs 11 spaced equidistantly along its circumference on the outside thereof.
9, and can be displaced in the axial direction within the aforementioned cylindrical guide portion 116. The tubular member 118 has a conically tapered tip 120.
At this point, the tubular member 118 contacts the valve disc 107 .

The outer surface of the rear portion 104 has a radial circumferential groove 12.
1 is provided, and an O-ring 122 made of elastomer material is fitted into this groove. Furthermore, the outer surface of the rear part 104 is also provided with a counterprotrusion 123, which is a component of the clamping joint. The front end of the tubular portion 112 may be selectively threaded to provide a secure clamping connection with a complementary pair of members.

The sleeve-like protective cap comprises two internally threaded tracks 125, 126, so that when mounted on the rear part 104, these tracks 125, 126 cooperate with the aforementioned projection 123 to form a clamping joint. do.

After removing the protective cap 124, remove the rear part 10.
A connecting member having an external conical portion complementary to the internal conical portion 105 of 4 can be pushed into this internal conical portion, and this connecting member then connects the axially displaceable member 118 to the valve disk 107. As a result, the central slit 108 is opened and communication with the through passage 109 is established. The protective sleeve surrounding the external cone is provided with a helical ring of a tightening joint, similar to the protective cap, so that the protective sleeve can be screwed in in the same manner as the protective cap via the counterprotrusion 123 and the O-ring Continue to do this until there is a firm engagement with 122 to ensure a tight seal.

FIG. 5 shows a coupling member with an external cone according to another embodiment, which is suitable for use when such a coupling member of the type shown in FIG. It is something that can be connected to a member. The connecting member includes a tube section 127 with an external connecting cone 128 at its front end. The rear end of the tube portion 127 has a connecting nipple 129
It is in the form of The tube portion 127 has a through passage 130, and when the two connecting members are connected, this through passage 130 extends and communicates with the through passage 109 of the connecting member shown in FIG. 4.

The protective sleeve 132 is connected to the tube portion 127 via the collar 131. An annular section 133 is formed between the protective sleeve 132 and the outer cone 128 or tube section 127 to connect the first connecting member 10.
The tubular section 112 with one inner cone 105 is connected to this annular section 133 after another connecting member, shown in FIG. 5, has been connected thereto.
It will be placed inside.

The protective sleeve 132 includes an internal cone 134 at its forward end, which facilitates press-fitting the protective sleeve 132 onto the O-ring 122.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the connected connecting members of the connecting device. FIG. 2 is a sectional view taken along line C--D in FIG. 1 of the first connecting member having an inner conical portion. FIG. 3 is a cross-sectional view of the first connecting member having an inner conical portion, taken along line A--B in FIG. 1; FIG. 4 is a longitudinal sectional view of a connecting member with an inner cone in a further embodiment of the connecting device according to the invention, with the protective cap in place; FIG. 5 is a longitudinal sectional view of a coupling member with an outer cone, which serves as a protective sleeve for the coupling device of FIG. 1,101...first connection member, 3,103...
...Nipple, 104...Rear portion (of the first connecting member), 5,105...Inner conical portion, 6,106...
...Radial circumferential groove, 7,107...Valve plate, 8,1
08...slit, star-shaped slit, 9,109...
...Through passage, 11... Fragile portion, 12, 112...
... tube part, 15 ... cylindrical part, 16 ... insertion member,
17... Center pin, 18... Recess, 19... Fragility point, 21, 121... Annular groove, 22, 122...
Circumferential bead, O-ring, 23,123...protrusion,
24... Another connecting member, 28, 128...
Outer conical portion, 32, 132...protective sleeve, 3
3... Annular groove, 116... Guide, 118... Annular member, freely displaceable member, 119... Rib, 120
... Part of the member (facing the valve plate), 124 ... Protective cap, 127 ... Pipe section, 130 ... Penetration passage, 131 ... Collar.

Claims (1)

Claims: 1. A cannula, catheter, consisting of two connecting members with nipples or tubes adapted to be positively interconnected with respective outer and inner cones on these members. In a connecting device for connecting flexible tubes, etc., the inner surface of the through passage of the first connecting member with the inner conical portion is provided with a radially circumferential groove, in which the through passage is blocked and the center a valve disc of elastomeric material having a slit is retained; another connecting member is connected to a protective sleeve concentrically surrounding the outer cone; and the first connecting member has the inner cone. connected to a connecting nipple supporting the outer conical part, which forms an annular groove having an inner diameter larger than the outer diameter of the part and having a length deeper than the insertion length of the inner conical part;
a cannula, characterized in that the outer cone, when in a connected state inserted into the inner cone, passes at least partially through the valve disk to open the slit; A connecting device for connecting catheters, flexible tubes, etc. 2 connecting cannulae, catheters, flexible tubes, etc., consisting of two connecting members with nipples or tubes adapted to be positively interconnected with their respective external and internal cones; In the coupling device, the inner surface of the through passage of the first coupling member with an inner conical portion is provided with a radial circumferential groove in which an elastomeric valve blocking the through passage and having a central slit is provided. A disc is retained and between the disc and the inner cone there is a guide for a tubular member, the tubular member being axially moved between the disc and the inner cone. and that its front end, in its retracted position, is arranged in front of the plane plate and in its protruding position partially passes through this plane plate to open the slit; When the conical portion is inserted into and connected to the internal conical portion, the external conical portion projects into the guide by a distance that the tubular member must project in order to open the valve disc. and the other connecting member connects via a collar on the outside of the tubular portion having the external conical portion to a protective sleeve that concentrically surrounds the tubular portion at a distance and projects beyond it. A connecting device for connecting cannulas, catheters, flexible tubes, etc., characterized in that they are connected.