Robert S Poland

US Patent:

40009726, Jan 4, 1977

Filed:

Jan 16, 1976

Appl. No.:

5/649648

Inventors:

Walter Jacob Braun - Englewood CO
John Henry Altshuler - Englewood CO
Gerald Lance Schlatter - Boulder CO
Robert LeRoy Poland - Boulder CO

Assignee:

Hemotec, Inc. - Englewood CA

International Classification:

G01N 3316

US Classification:

23230B

Abstract:

A system for determining the coagulation time of blood and components thereof, the amount of anticoagulant to be injected before and during surgery, and the amount of additive required to neutralize the anticoagulated blood during and after surgery. With collected samples of anticoagulated blood inserted into the system coagulation of the blood is accelerated through the controlled injection of a neutralizing additive by a corresponding injection of regulated gas. Failsafe means determine if gas is being injected into the sample and detection means detect the event of coagulation and indicate the elapsed time for coagulation. Before surgery, an anticoagulant is added to the patient's blood in a quantity necessary to avoid coagulation during surgery. The system responsive to the parameters of the patient's sex, height, and weight and/or pump volume and blood volume determines the amount of anticoagulant to be injected. During operation, samples of blood are periodically taken and analyzed to determine additional amounts of anticoagulant or neutralizing additive to inject.