Patent ID: 7540538

Claim:
A coupler joint to be interposed between a connector and a coupler connected to the connector so as to be liquid tight, wherein the connector is a dialyzer connector and the coupler is a coupler provided at a tip of a solution supplying/discharging tube extending from a dialysis apparatus, the coupler joint consisting of a hollow cylindrical portion opened at its opposite ends and a flange provided along a circumference of the cylindrical portion, said coupler joint having a structure such that one end of the coupler joint is dimensioned and configured to be inserted into an opening of the connector and the other end is dimensioned and configured to be inserted into an opening of the coupler, and such that when said coupler joint is interposed between said connector and coupler one side of the flange is in liquid tight abutment with a surface at the opening of the connector, and the other end of the flange is in liquid tight abutment with the seal surface of the coupler; wherein the coupler has a sleeve and at least one ball bearing for engaging the connector, the connector has a groove for engaging the ball bearing, and when the sleeve is moved backward, the at least one ball bearing moves outwardly in the radial direction so that the connector can be inserted into the coupler.