CASSETTE FOR PUMPING A TREATMENT SOLUTION THROUGH A DIALYZER

摘要

A cassette is provided for installation in a dialysis monitor to pump a treatment solution through a dialyzer. The cassette is a unitary component with a hydraulic manifold (53) and a pneumatic manifold (54) integrated into a body (52). The body (52) has connectors for connecting the hydraulic manifold (53) to the dialyzer and the pneumatic manifold (54) to a pneumatic pressure source. A set of solution pumps is integrated in the cassette, and each solution pump includes a pump cavity inside the body. The solution pumps are operable to displace the treatment solution through the hydraulic manifold (53) to and/or from the dialyzer by action of a reciprocating gas-liquid interface in the pump cavity (30) of the respective solution pump. The gas-liquid interface is formed directly between a gaseous substance and the treatment solution. A valve arrangement (58) is attached to the body (52) and operable to control admission of the gaseous substance and the treatment solution to the pump cavity (30) so as to reciprocate the gas-liquid interface and thereby pump the treatment solution through the hydraulic manifold (53). The cassette is configured to pump the treatment solution without moving parts inside the body (52).

主权项

1. A cassette for pumping a treatment solution through a dialyzer in a dialysis system, said cassette comprising:
a body, a hydraulic manifold which is defined inside the body and configured for fluid communication with a first hydraulic connector on the body, the first hydraulic connector being arranged for connecting the dialyzer to the cassette, a pneumatic manifold which is defined inside the body and configured for fluid communication with a first pneumatic connector on the body, the first pneumatic connector being arranged for connecting the cassette to a pneumatic pressure source, a set of solution pumps integrated in the cassette, each solution pump of the set of solution pumps including a pump cavity which is defined inside the body for fluid communication with the hydraulic and pneumatic manifolds, and a valve arrangement which is operable to selectively communicate the pump cavity with the hydraulic and pneumatic manifolds so as to, during the operation of the respective solution pump, reciprocate an interface in the pump cavity and thereby displace the treatment solution through the hydraulic manifold, wherein each of the pump cavities defines, during operation of the respective solution pump, said interface as a direct gas-to-liquid interface in the pump cavity between a gaseous substance admitted via the pneumatic manifold and the treatment solution admitted via the hydraulic manifold.