CZ305387B6 - Interconnecting device of instrumentation for extracorporeal eliminations - Google Patents

Abstract

The present invention relates to an interconnecting device being formed by a supply tube (7) connecting a primary apparatus (1) with a secondary apparatus (2) and a return tube (8) connecting the secondary apparatus (2) with the primary apparatus (1). The primary apparatus (1) is provided at its inlet from the secondary apparatus (2) with a pipe connection (4) that is arranged at its end in the form of a threaded projection (5) serving for connection of a connection sleeve (6) connected with the return tube (8).

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for extracorporeal elimination of unwanted impurities from blood plasma comprising a lance from a primary to a secondary apparatus and a return tube from a secondary to a primary apparatus.

BACKGROUND OF THE INVENTION

Apparatus for extracorporeal elimination of unwanted impurities from blood plasma consist of a primary apparatus that separates plasma from the blood and a secondary apparatus that detects unwanted impurities from the blood plasma. The devices are interconnected with a lance for supplying blood plasma from the primary to the secondary apparatus and a return tube to remove the plasma from the secondary apparatus back to the other part of the primary apparatus, where it is again mixed with the other parts of the blood. The inlet tube is provided at both ends with commonly used connections. The return tube is also provided with a commonly used connection on the secondary apparatus, and in earlier embodiments, the primary apparatus is provided with a slipped elastic sleeve the inside diameter of which corresponds to a tight fit on a standard connection spike, as shown in CZ 301836. return pipe connection made only with female sleeve. This embodiment requires a connection valve to connect the return tube, one connection of which is connected to the female sleeve and the other connection is connected to the end of the return tube. The use of this valve, due to its internal configuration, limits flow to the return pipe and compromises sterility, which must be strictly observed with these devices. Furthermore, this embodiment is economically disadvantageous.

Document EP 2524711 discloses joining of tubes by means of a coupling element intended mostly for joining tubes in operations. An embodiment of this connecting element consists in radial pressure of the connecting tubes by means of a rather complicated connecting element in three places. This embodiment is relatively fast to use, but its complexity makes it too difficult to manufacture and connect itself to connect extracorporeal elimination devices. For this reason it is very difficult to use for this purpose, and it solves the connection by radial thrust, which is disadvantageous for this use and from the point of view of tightness. The solution according to US 20070724036 solves the connection of the hoses by means of a sealing ring with a notch while applying a radial thrust while simultaneously generating an axial thrust by means of another axially tightening ring. This embodiment is suitable for craft hose assembly, but to connect extracorporeal elimination devices this solution is unsuitable in terms of both tightness and sterility because it is blood flow, which requires more stringent aspects than conventional hose assembly. In addition, this coupling device is also complicated both in production and in the connection itself. The solution according to JP 2000018461 discloses a threaded and O-ring plastic pipe connection which is also suitable for conventional craft joining, but is unsuitable in terms of tightness, handling and sterility for medical connection of devices, in particular for blood drainage.

It is therefore an object of the invention to provide such a connection of the primary device to the return tube which avoids the need for a connection valve, will not be complicated and in particular will be of considerable benefit by eliminating the risk of sterility.

SUMMARY OF THE INVENTION

The object is achieved by a connection device according to the invention, characterized in that the primary device is provided with a sleeve at the inlet of the secondary device at the end arranged in a threaded projection for connecting the connection sleeve connected to the return tube.

Clarification of the drawing

The device interconnection device for extracorporeal elimination according to the invention is schematically shown in the attached drawing.

DETAILED DESCRIPTION OF THE INVENTION

The coupling device serves to connect the primary device 1 to the secondary device 2 and consists of a supply tube 7 provided with connections 3 at both ends. Further, the connection device consists of a return tube 8 with a secondary device 2 connected by a connection 3 and provided with a connection sleeve 6 secured to the threaded projection 5 formed on the sleeve 4, which is provided with the inlet of the primary apparatus.

Blood is supplied from the primary apparatus 1, where the plasma is separated therefrom and is fed through the lance 7 to the secondary apparatus 2, in which the blood plasma is free of undesirable impurities and is fed through the return tube 8 through the connection sleeve 6 and sleeve 4 to the primary apparatus 1 from where it is led back to the patient.

Claims (1)

PATENT CLAIMS Device interconnection device for extracorporeal elimination of unwanted impurities from blood plasma, consisting of a lance (7) from a primary device (1) to a secondary device (2) and a return tube (8) from a secondary device (2) to a primary device (1) characterized in that the primary device (1) is provided on the inlet from the secondary device (2) with a sleeve (4) at the end arranged in a threaded projection (5) to which the connecting sleeve (6) is connected to the return tube (8). 1 drawing