ELECTROMAGNETIC CATHETER VELOMETER - FLOW METER

• US 3,734,083 A
• Filed: 09/22/1970
• Issued: 05/22/1973
• Est. Priority Date: 09/22/1970
• Status: Expired due to Term

• Current Assignee: Alexander Kolin
• Original Assignee: Alexander Kolin
• Inventors: Kolin, Alexander
• Primary Examiner(s): Howell, Kyle L.
• Application Number:
  US05/074,436
• Time in Patent Office: 973 Days
• Field of Search: 128/2.5F,2.5R,2A,2.1R,345,349 73/194EM
• US Class Current: 600/505
• CPC Class Codes: A61B 5/027 using catheters
• CPC Class Codes: A61B 5/6856 with a distal loop
• CPC Class Codes: A61M 25/04 in the body, e.g. expansible A61M25/10, A61M16/0488 take precedence

Abstract

A catheter is provided in the form of an open ended flexible tube, the tube having an intermediate slitted portion. Each of the two sections of the tube adjacent the slitted portion is shaped outwardly into an arched configuration. A pair of electrodes are mounted in the interior of the portion of the tube between the slitted portion and the open end. A slidable plunger may be mounted in the tube, and which can be moved into position to prevent fluid flow through the tube.

Claims

1. Catheter for use in flow measurement comprising:

a tube adapted to be inserted into a biological flow vessel and to reside substantially longitudinally therein, said tube having entrance passage means for admitting biological fluid into said tube from the vessel, and exit passage means spaced longitudinally of said tube from said entrance passage means for exiting body fluid from said tube back into the vessel;

centering means for maintaining that portion of the tube having said entrance and exit passage means substantially centrally located within the vessel, said centering means being formed by a pair of diametrically oppositely disposed arched longitudinal portions of said tube formed from an intermediate longitudinal slit therein and having a resilient outward bias from the longitudinal axis of the tube, said slit constituting one of the passage means; and

detecting means mounted internally of said tube between said entrance and exit passage means for detecting fluid flow in that portion of the tube between said entrance and exit passage means.

2. Catheter in accordance with claim 1 wherein said detecting means comprises a pair of diametrically disposed electrodes adjacent the interior of said tube.

3. In flow sensing equipment, the combination comprising the catheter of claim 1;

and means for imposing a magnetic field substantially perpendicular to the axis of said tube and to a line joining said electrodes.

4. Catheter in accordance with claim 1 including additionally a plunger slidably mounted in said tube and insertable longitudinally through one of said passage means into the portion of said tube between said entrance and exit passage means to selectively block the flow of biological fluid past said detecting means.

5. Catheter in accordance with claim 1 wherein said detecting means comprises a pair of diametrically disposed electrodes mounted in the interior of said tube adjacent the inner wall thereof.

6. In flow sensing equipment, the combination comprising the catheter of claim 5;

and means for imposing a magnetic field substantially perpendicular to the axis of said tube and to a line joining said electrodes.

7. Catheter for use in flow measurement comprising:

a tube adapted to be inserted into a biological flow vessel and to reside substantially longitudinally therein;

said tube having a pair of diametrically disposed, longitudinal outwardly arched portions formed from an intermediate slit in the tube, said intermediate slit constituting first passage means for biological fluid communicating between the interior of said tube and the flow vessel;

second passage means in said tube spaced longitudinally from said slit; and

detecting means mounted interiorly of said tube between said first and second passage means for detecting fluid flow in that portion of the tube between said first and second passage means.

8. Catheter in accordance with claim 7 including additionally:

a plunger slidably mounted in said tube and insertable longitudinally into said portion of said tube between said first and second passage means to selectively block the flow of biological fluid through the tube past said detecting means.

9. Catheter in accordance with claim 7 wherein said detecting means comprises a pair of diametrically disposed electrodes mounted in the interior of said tube adjacent the inner wall thereof.

10. In flowing sensing equipment, the combination comprising the catheter of claim 9;

and means for imposing a magnetic field substantially perpendicular to said tube and to a line joining said electrodes.

11. Catheter for use in flow measurement comprising:

a tube adapted to be inserted into a biological flow vessel and to reside substantially longitudinally therein;

said tube having a pair of longitudinally spaced passage means;

detecting means mounted interiorly of said tube between said pair of passage means for detecting fluid flow in that portion of said tube between said pair of passage means; and

a plunger slidably mounted in said tube and insertable longitudinally into the portion of said tube between said pair of passage means to selectively block the flow of biological fluid through the tube past said detecting means.

12. Catheter in accordance with claim 11 wherein:

said plunger is tubular, and includes means for selectively blocking or permitting the fluid flow through said plunger, whereby fluids may be selectively flowed from or into the flow vessel through said plunger and tube.