# US 4,394,866 A · S-A Node helical lead for atrial pacemakers and method of placement

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- Number: US 4,394,866 A
- Document ID: US4394866A
- Status: Granted
- Kind: A
- Application number: 06/226,831
- Filed: 1981-01-21
- Granted: 1983-07-26
- Earliest claimed: 1981-01-21
- Assignees: Research Corporation
- Inventors: Howard C. Hughes
- Web page: https://patentgrep.com/patent/US4394866A

## CPC

- A61N 1/056: {Transvascular endocardial electrode systems}
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)

## Abstract

An improved unipolar or bipolar lead for at least S-A Node Atrium Contact to provide atrial pacing or atrial synchronized pacing wherein the distal end of the lead is configured as a S-A Node helix whose coiled diameter is larger than that of the cava.

## Claims

### Claim 1

An improved electrically conductive lead for at least S-A Node Atrium Contact to provide atrium pacing and sensing comprising an electrical conductor having a lumen there through, an electrode tip, said electrode tip being electrically connected to the electrical conductor adjacent one end of the conductor, and S-A Node helix, said helix extending from the electrode tip toward the other end of the electrical conductor a distance of 6 to 12 inches and having at least one-and-a-half turns and a non-conductive biocompatable coating encasing the electrical conductor except the electrode tip.

### Claim 2 (depends on 1)

The invention defined in the claim 1 wherein the diameter of the helix is between 1 and 3 inches.

### Claim 3 (depends on 1)

The lead as defined in claim 1 wherein the conductor coating comprises segmented polyurethane and the S-A Node helix configuration is heat set.

### Claim 4

An improved electrically conductive lead for at least S-A Node Atrium Contact to provide atrium pacing and sensing comprising an electrical conductor having a lumen there through, an electrode tip, said electrode tip being electrically connected to the electrical conductor adjacent one end of the conductor, an S-A Node helix, said helix extending from the electrode tip toward the other end of the electrical conductor a distance of 6 to 12 inches, and a non-conductive biocompatible coating encasing the electrical conductor except the electrode tip wherein the helix configuration is made by using a conductive wire with a memory helical coil that would cause the lead to maintain its helical shape and yet be able to be stretched.

### Claim 5

A method for at least S-A Node Atrial pacing and sensing comprising the steps forming an electrically conductive lead having a hollow lumen axially therein from an electrical conductor having a tip electrode electrically connected to the conductor, forming the end of the conductor having the electrode tip into a helix having at least one-and-a-half turns, inserting a stylet in the lumen of the lead to cause the lead including its electrode tip end to be straightened, inserting the stylet straightened lead in the atria of a patient via the superior vena cava; removing the stylet from the lumen of the lead to allow the lead to return to its original helix configuration in the atria; slightly retracting the lead and imparting several clockwise axial turns to the lead to cause contact between the atrium at the S-A Node, with the tip electrode of the conductor.