Digital memory with power outage and memory overload logic in a dialysis system

Patent 4098274 Issued on July 4, 1978. Estimated Expiration Date:

July 4, 1995. 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

3197068

3636941

3655095

3731680

3736930

3814082

Physiological waveform detector
Patent #: 3939824
Issued on: 02/24/1976
Inventor: Arneson , et al.

Apparatus for extracorporeal treatment of blood
Patent #: 3946731
Issued on: 03/30/1976
Inventor: Lichtenstein

Calibrated blood pressure measuring system and method Patent #: 4011860
Issued on: 03/15/1977
Inventor: Lee

Inventors

Assignee

Baxter Travenol Laboratories, Inc.

Application

No. 05/733584 filed on 10/18/1976

US Classes:

604/5.01, Constituent removed from blood and remainder returned to body210/85, WITH ALARM, INDICATOR, REGISTER, RECORDER, SIGNAL OR INSPECTION MEANS210/90, Fluid pressure responsive600/486, Testing means inserted in body604/118, Having means for varying, regulating, indicating, or limiting injection pressure or aspirating suction604/65Material flow varying means controlled by condition responsive sensor

Examiners

Primary: Michell, Robert W.
Assistant: Jaworski, Francis J.

Attorney, Agent or Firm

International Class

A61M 1/36 (20060101)

Abstract

There is disclosed herein a blood pressure alarm system for use in a dialysis machine whereby alarms may be activated, and a blood pump deactivated if the actual blood pressure increases above or decreases below predetermined levels. The levels are determined by setting a particular blood pressure point and setting the amount by which the pressure can vary above and below the set point. A memory is provided for storing the set point and preventing variation of the set point with time. The dialysis machine and alarm system can malfunction under certain conditions and protection circuitry operates the alarms if a malfunction occurs.