US 5,120,303 AGranted

Method and apparatus for hemodialysis with a single needle

OwnerRemi O. J. Hombrouckxinventor

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Abstract

The dialysis apparatus with a single needle comprises a reversible pump (3) controlled by a program so as to provide, in the first rotation direction, for the removal of a predetermined blood volume outside the circulatory system of a patient (P), the treatment of said blood volume in an artificial kidney (4) and the discharge into an expansion chamber (5), as well as, in a reverse rotation direction, to provide for the return of purified blood towards the patient (P) after a second purification in the artificial kidney (1). The expansion chamber (5) under pressure is used both as a blood accumulation container and as a housing for measuring the pressure. Its capacity is 4 to 5 times more than the internal volume of the artificial kidney (4).

Claims10

Dependent claims

A method for hemodialysis using a single needle (2), comprising the steps of:

alternately removing, from the body of a patient (P) by means of a pump (3), a predetermined volume of blood coming from a fistula, a vein or an artery:
and filtering the removed volume of blood in an artificial kidney (4) and then returning it to the patient (P) at the same puncture location by a single and same needle;
wherein the removal of the predetermined volume of blood from the body of the patient and the movement of the blood in a first direction (X) through the artificial kidney to an expansion chamber on the one hand, and the return of the filtered blood into the body of the patient, on the other hand, by movement of the blood in an opposite direction (Y) through a single and same blood line (6) and the same needle, are carried out using a reversible pump, the direction of rotation of which is controlled automatically in a programmed manner by means of a regulating and measuring device, and
wherein the filtration of the blood is carried out twice in succession in the artificial kidney (4), that is a first time during a blood delivery phase in the first direction (X) and during a blood return phase in the second direction (Y) which is opposite to said first direction (X).

1 more element

Apparatus for hemodialysis using a single needle, in which a predetermined volume of blood from a fistule, a vein or an artery is alternately drawn from the body of the patient by means of a pump to be filtered in an artificial kidney and then returned to the patient at the same puncture location, comprising:

a needle,
a section of tube between the needle and a pump,
the artificial kidney,
an expansion chamber composed of a closed receptacle provided with a blood delivery and removal tube and provided in its upper part with an apical air tube and provided, a few millimeters lower, with an infusion line enabling the kidney to be rinsed, medication to be administered and the height of the blood level to be adjusted by means of air under pressure, and
a device for measuring and controlling the pump, wherein
the pump is intermittently reversible and has an output directly connected to the artificial kidney,
the needle, the pump and the expansion chamber are situated on a same blood line,
the expansion chamber is farther from the puncture point than the pump, and
the infusion line ends in the expansion chamber a few millimeters lower than the apical air tube.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/359,665Filed 28 Apr 1989
Priority: BE 21714210 Sep 1986
Granted: 9 Jun 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

A61M 1/30
Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for…:…
A61M 1/303
Details: having a reservoir for treated blood to be returned
A61M 1/306
Control of inversion point between collection and re-infusion phase: pressure control, e.g. using substantially rigid closed or gas buffered or…
A61M 1/3604
Extra-corporeal circuits in which the blood fluid passes more than once through the treatment unit: in opposite directions

Family

No related US applications are recorded in the indexed filing history.

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