Pipe joints or couplings – With indicator – alarm or inspection means
Patent
1994-12-22
1997-06-24
Arola, Dave W.
Pipe joints or couplings
With indicator, alarm or inspection means
285423, 264 35, 2642711, 425453, F16L 3500
Patent
active
056411847
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a tube of plastic and with an insertion end, an intermediate portion, and a receiving end, which tube is adapted to connect a hose to a spigot end, especially for medical use, and where the intermediate portion in a first half part of the tube comprises an elastic deformable body arranged in a hollow in the tube wall, which body is to be pierced by a hypodermic needle point, and which body along its circumference has sealing elements concurring with the tube.
Furthermore, the invention relates to a method of producing the tube as well as a tool for implementation of the method of producing several of the mentioned tubes.
For medical use it is common practise that several devices are to be connected with each other in order to produce a flow passage for a fluid, such as a liquid or a gas. The devices are thus provided with coupling elements which are firmly mounted on the individual device.
The coupling elements often comprise an insertion portion in the form of a tube on the one device and a receiving portion on the second device.
The insertion portion is configured as a short tube having a tapered end, and the receiving portion is configured as a muff the bore of which converges conically inwards towards the device. The size of the mentioned tapered parts is adapted to the material of the coupling elements in such a manner that the parts can remain in their coupled position by means of friction or gluing.
In order to avoid an exact alignment of the coupling elements on two devices that are to be coupled together generally hoses are used to connect the coupling elements.
During application of the devices it is often necessary to take a sample of a fluid being transported from one device to another or to add a substance or liquid to the mentioned fluid.
Thus it must be ensured that no fluid leaks out or that the fluid is not contaminated during such tests or injections. This object is achieved by sticking a hypodermic needle point into the flow passage.
The applied hoses are, however, of such a kind or such material that piercing by a hypodermic needle is not advisable.
Consequently, a tube of plastic has been produced, which tube has an elastic deformable body arranged in the tube wall, which body is arranged to be pierced at least once by a hypodermic needle point, partly as the body closes tightly round the needle during insertion and contracts tightly when the needle is withdrawn, so that no fluid may leak out from the flow passage or any contamination may enter the flow passage during or after the sampling or testing.
However, there is a drawback to the known tube in that it does not close sufficiently tight to the hollow in the tube wall, and thus fluid and/or contamination may pass through the joint between the body and the hollow in the tube wall. It may occur that the body during piercing by the needle point is pushed into the through-going bore of the tube or that the body is pulled out of the tube hollow during withdrawal of the hypodermic needle.
This is due to the fact that the body in the known tube is merely stuck into the hollow from the outside of the tube, which hollow wall extends rectilinearly against the longitudinal bore in the tube, whereupon the body is secured in the hollow solely by the friction between the two parts, as the dimension of the body is somewhat larger than that of the hollow, so that the body exercises a force against the wall of the hollow due to the deformation.
The object of the present invention is to provide a configuration of the known tube which can produce sufficient sealing between the body and the hollow of the tube wall, so that the mentioned drawback is avoided, as the object of the invention is also to provide a method for a secure and safe placing of the body in the hollow of the tube wall as well as to provide a tool for use in the implementation of the method mentioned.
This object is achieved with a tube of the type referred to above, which tube according to the invention is characteristic in that the sealing elements comprise
REFERENCES:
patent: 3898988 (1975-08-01), Morgan
patent: 3990445 (1976-11-01), Lundquist
patent: 4214779 (1980-07-01), Losell
Arola Dave W.
Maersk Medical A/S
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