Liquid purification or separation – With repair or assembling means
Patent
1998-04-27
2000-03-14
Drodge, Joseph W.
Liquid purification or separation
With repair or assembling means
21032171, 210541, 210646, 2483112, 248313, 604 4, B01D 6130
Patent
active
060368586
DESCRIPTION:
BRIEF SUMMARY
EP-B1 0 278 100 describes a dialysis system wherein the dialysis liquid is prepared at the site of use from a powder (sodium bicarbonate) which is supplied in a closed container--cartridge--which is inserted into a holder on the machine and is connected to an inlet for water and an outlet for the concentrated solution of the powder, which is obtained when water flows through the cartridge and dissolves the powder. This liquid concentrate then is added in an accurately measured amount to a water flow in the machine for obtaining dialysis liquid having the required concentration.
In a dialysis machine available on the market, which operates with this system, Gambro AK 100, the cartridge is inserted between two jaws pivotally mounted on a vertical wall of the machine one above the other, one of these jaws having an inlet for water and the other an outlet for the liquid concentrate obtained by dissolving the powder in the cartridge when water is allowed to flow through the cartridge. Then, the inlet and the outlet are connected to hollow studs which are provided at the ends of the cartridge. The connection takes place by penetrating membranes which are provided on the hollow studs and close these studs. The upper jaw is swung upwards when the cartridge is to be located between the jaws or is to be removed from this position after the powder in the cartridge having been consumed, but the jaws can also be swung towards said wall of the machine, the upper jaw downwards and the lower jaw upwards, in order that the inlet and the outlet, respectively, shall be connected with two connection pieces on the wall which are dimensioned in the same manner as the hollow studs on the cartridge. Between these connection pieces there is provided a short-circuit conduit so that liquid can flow from one jaw to the other via the short-circuit conduit without passing through a cartridge positioned between the jaws. This short-circuit connection is used also when the machine between two dialysis treatments following one upon the other has to be rinsed and disinfected by circulating a flow of disinfection liquid through the machine.
When a dialysis treatment has been effected there is always left some liquid in the cartridge. When the cartridge after a completed dialysis treatment is removed from the prior art dialysis machine it can therefore not be avoided that this liquid flows out onto the lower jaw and soils this jaw and above all the sealing ring or sealing rings which are provided in the jaw to seal around the hollow studs on the cartridge. When the water evaporates precipitated powder remains on the sealing rings. This will not be removed by the rinsing cycle because the sealing rings then are operative to seal around the short-circuit connection pieces on the machine. Precipitation or deposition of powder on the sealing rings causes increased wear of the sealing rings and reduces the sealing ability thereof so that they often have to be exchanged. In the prior art dialysis machine exchange of the rings is cumbersome and requires time consuming mounting work.
The purpose of the invention is to eliminate these drawbacks by providing a device of the kind mentioned above which makes possible that the sealing rings which shall seal between the hollow studs of the cartridge and the inlet and the outlet, respectively, are exposed during the rinsing and disinfection cycle to be rinsed and disinfected, and wherein the sealing rings are mounted on the jaws in such a manner that they can be exchanged in a simple manner when required without extensive demounting and mounting work being required.
The purposes mentioned above are achieved by the according to the invention having obtained the characterizing features of claim 1.
In order to explain the invention in more detail an illustrative embodiment will be described with reference to the accompanying drawings in which
FIG. 1 is a perspective view of a dialysis machine with the device according to the invention,
FIG. 2 is a side view of the powder cartridge mounted in the dialysis mach
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Carlsson Per-Olov
Falkvall Thore
Gillerfalk Bjorn
Althin Medical AB
Drodge Joseph W.
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