Phillip D Messinger

US Patent:

51488116, Sep 22, 1992

Filed:

Sep 4, 1990

Appl. No.:

7/577153

Inventors:

Phillip D. Messinger - Powell OH

Assignee:

Medex, Inc. - Hilliard OH

International Classification:

A61B 502

US Classification:

128673

Abstract:

A source of saline solution under pressure is connected through tubing to a catheter inserted in a patient's blood vessel. A waste collection bag is connected to the tubing through a stopcock which permits the selective connecting of the catheter to the waste collection bag or the bag of saline solution. The sampling site is in the tubing between the catheter and the stopcock. Normally, saline solution flows into the patient's blood vessel. When a sample is to be taken, the stopcock is shifted so that the pressure of the patient's blood forces blood into the tubing, driving saline into the waste collection bag. When blood has reached the sampling site, blood is extracted with a hypodermic syringe.

US Patent:

50485377, Sep 17, 1991

Filed:

May 15, 1990

Appl. No.:

7/524224

Inventors:

Phillip D. Messinger - Powell OH

Assignee:

Medex, Inc. - Hilliard OH

International Classification:

A61B 502

US Classification:

128673

Abstract:

A source of saline solution under pressure is connected through tubing to a catheter inserted in a patient's blood vessel. A waste collection bag is connected to the tubing through a stopcock which permits the selective connecting of the catheter to the waste collection bag or the bag of saline solution. The sampling site is in the tubing between the catheter and the stopcock. Normally, saline solution flows into the patient's blood vessel. When a sample is to be taken, the stopcock is shifted so that the pressure of the patient's blood forces blood into the tubing, driving saline into the waste collection bag. When blood has reached the sampling site, blood is extracted with a hypodermic syringe.