Liquid purification or separation – With repair or assembling means
Reexamination Certificate
1999-08-30
2001-10-09
Kim, John (Department: 1723)
Liquid purification or separation
With repair or assembling means
C210S195200, C210S252000, C210S321710, C210S416100, C210S418000, C210S420000
Reexamination Certificate
active
06299769
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a sterile disposable hemodiafiltration set to be connected to a dialysis machine comprising a dialyzer with an extracorporeal blood path and a dialysis liquid supply line, which can be connected to the dialyzer.
In the conventional hemodialysis treatment impurities are separated from the blood in the dialyzer by diffusion while the separation of impurities in hemodiafiltration treatment is effected both by diffusion and by convection dialysis liquid being supplied as a substitute liquid to the blood in the extracorporeal path. Hemodiafiltration treatment is preferred because also greater molecules are separated from the blood; greater molecules cannot be separated to the same extent when the dialysis treatment includes diffusion only. The dialysis liquid to be supplied to the blood as the substitute liquid is of course subject to higher demands as to sterility than dialysis liquid passing through the dialyzer and, therefore, it undergoes supplementary filtering before being supplied to the blood path.
U.S. Pat. No. 4,702,829 describes a machine for hemodiafiltration wherein the dialysis liquid to be used as substitute liquid is passed through two sterile filters provided in the machine which are not used for filtering the dialysis liquid to be supplied to the dialyzer. Having passed the sterile filters the substitute liquid is passed through a disposable line section including a microfilter and being connected to the blood path either on the outlet side of the dialyzer (post-dilution) or on the inlet side of the dialyzer (pre-dilution).
In the dialysis machine intended for hemodiafiltration according to U.S. Pat. No. 4,702,829 as in other dialysis machines on the market, intended for hemodiafiltration there is provided on the machine a separate outlet for substitute liquid to which a disposable set forming part of the hemodiafiltration circuit is connected in order to set up the dialysis machine for hemodiafiltration treatment, said circuit being partly permanent and exposed to disinfection between the treatments in the dialysis machine especially constructed for hemodiafiltration.
SUMMARY OF THE INVENTION
Taking into account that the dialyzer always is connected to the dialysis machine via hoses by quick connectors (Hansen connectors) the object of the invention is to provide a disposable set which can be easily connected to any dialysis machine constructed for hemodialysis and having ultrafiltration control but in no way constructed or prepared for hemodiafiltration treatment, in order to allow that the dialysis liquid to be supplied to the dialyzer is partly drained off and after filtration in a sterile microfilter included in the disposable set, is supplied to the blood path.
In order to achieve said object the disposable set of the kind referred to above has obtained according to the invention the features of the claims. By this arrangement it is possible to make dialysis liquid available on any dialysis machine constructed for hemodialysis and having ultrafiltration control simply by disconnecting the dialyzer from the dialysis liquid and supply line and interconnecting the three-way joint between the supply line and the dialyzer the dialysis liquid after filtration in the sterile filter being supplied via the hose connection to the blood path at one side or the other of the dialyzer (pre-dilution or post-dilution, respectively).
According to a preferred embodiment of the invention the sterile filter is combined with the three-way joint and forms an integral unit therewith.
REFERENCES:
patent: 4702829 (1987-10-01), Polaschegg et al.
patent: 5334315 (1994-08-01), Matkovich et al.
patent: 5490925 (1996-02-01), Eigendorf
patent: 5499974 (1996-03-01), Rosen
patent: 5540668 (1996-07-01), Wilson, Jr. et al.
patent: 5702597 (1997-12-01), Chevallet et al.
patent: 6022481 (2000-02-01), Blake
Carlsson Per-Olov
Falkvall Thore
Sandberg Lars-Olof
Althin Medical AB
Barrett Robert M.
Kelly Paula J. F.
Kim John
Mattenson Charles R.
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