Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Reexamination Certificate
1998-05-14
2001-09-18
Seidel, Richard K. (Department: 3763)
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
C604S256000
Reexamination Certificate
active
06290682
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an infusion set having a container for liquid medicines, which is connected to a drip chamber by a feed-line and a differential pressure valve and by a further feed-line connected to a front end being controlled by a roller clamp. A similar structure is disclosed in U.S. patent application Ser. No. 08/800,779, now issued as U.S. Pat. No. 5,935,100, which is hereby incorporated by reference. In the disclosed structure, the differential pressure valve has two inlets, each with an associated differential force chamber, wherein the two differential force chambers are sealingly separated from each other by a diaphragm disk and, wherein further the two differential force chambers together are connected to an exit line for the liquid medicine.
In the infusion set according to U.S. patent application Ser. No. 08/800,779, the differential pressure valve is performed such that it is used to empty sequentially a number of containers filled with liquid medicines in a controlled way.
In known infusion sets, an additional check valve is necessary to prevent a contamination of the set in the case of an occlusion or the like. Further, in many cases, it is necessary while the infusion is going on to administer additional amounts in a surge-like manner or to additionally inject, for example, contrast substances.
SUMMARY OF THE INVENTION
In an infusion set of the present invention, this aim is achieved by the fact that the differential pressure valve is configured as a 3-way check valve by the first inlet being connected to the container for the liquid medicine and by the second inlet being configured for the connection to a syringe or the like.
In an preferred embodiment according to the invention, the first inlet is provided with a male “Luer-Lock”-connector and the second inlet has a female “Luer-Lock”-connector.
According to a preferred embodiment of the invention, the valve comprises two valve housing halves sealingly connectable with each other, wherein one valve housing half has the first inlet and the second valve housing half has the exit line and the second inlet. In detail, it is of advantage that the two valve housing halves are connectable with each other. Within the differential force chambers each valve housing has an annular ridge concentric to a liquid inlet or liquid outlet, respectively, wherein the first inlet which is connected to the container is associated with an annular ridge having a larger diameter and the outlet line is associated with an annular ridge having a smaller diameter.
It is further preferred in this connection that the diaphragm disk is positioned with a part of its circumference at an opening which leads to the second inlet.
A further improvement of the invention consists of the fact that the liquid outlet of the exit line coaxially opening to the annular ridge having the larger diameter has an angular shape and that the liquid inlet of the first inlet opening is coaxial to the other annular ridge and extends coaxially to the first inlet.
The desired valve action with an excellent sealing at very small pressures is achieved by the fact that the diaphragm disk has a circular shape and is manufactured from a sheet of liquid silicone, silicone or natural rubber or a strip of liquid silicone, silicone or natural rubber.
The invention is described in more detail with reference to the drawings.
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Brinks Hofer Gilson & Lione
Filterek Inc.
Hayes Michael
Seidel Richard K.
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