Apparatus and method for automatically controlling hemodialysis at a pre-selected ultrafiltration rate

Patent 4209391 Issued on June 24, 1980. Estimated Expiration Date:

November 6, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Valveless positive displacement pump
Patent #: 4008003
Issued on: 02/15/1977
Inventor: Pinkerton

Proportioning fluids
Patent #: 4037616
Issued on: 07/26/1977
Inventor: Pinkerton

Apparatus for exposing a fluid to a negative pressure
Patent #: 4054522
Issued on: 10/18/1977
Inventor: Pinkerton

Renal dialysis concentrate delivery system
Patent #: 4085046
Issued on: 04/18/1978
Inventor: Saporito, Jr.

Automated hemodialysis treatment systems
Patent #: 4113614
Issued on: 09/12/1978
Inventor: Rollo , et al.

Apparatus for treatment of artificial kidney dialyzing fluid
Patent #: 4118314
Issued on: 10/03/1978
Inventor: Yoshida

Double-action proportioning pump Patent #: 4119113
Issued on: 10/10/1978
Inventor: Meginniss, III

Inventors

Assignee

Cordis Dow Corp.

Application

No. 05/958329 filed on 11/06/1978

US Classes:

210/647, Maintaining critical concentration(s)137/99, Interconnected flow displacement elements210/143, AUTOMATIC CONTROL210/188, WITH GAS SEPARATOR210/321.65, Permeated liquid quantity measurement or control210/929HEMOULTRAFILTRATE VOLUME MEASUREMENT OR CONTROL PROCESSES

Examiners

Primary: Wyse, Thomas G.
Assistant: Cross, E. Rollins

Attorney, Agent or Firm

Waldrop; Neal A.

International Class

A61M 1/16 (20060101)

Abstract

Apparatus for and method of automatically controlling the quantity and rate of liquid removed from blood during hemodialysis. The apparatus supplies dialysate in a single pass system in a closed, controlled volume circuit which includes an above atmospheric pressure portion and a below atmospheric pressure portion. The above atmospheric pressure portion includes a pair of chambers for alternate supply to and removal of the dialysate from the below atmospheric pressure portion which contains an artificial kidney and a third means for removing fresh dialysate from the above atmospheric pressure portion; the below atmospheric pressure portion includes means which isolates the kidney containing portion and restores pressure to spent dialysate to a pressure at least equal to or higher than the pressure of the dialysate fed into said closed circuit; the above atmospheric circuit also includes means for removing gas from the spent dialysate prior to filling the spent dialysate removal chamber before discard.