# US 5,217,027 A · Temporary cardiac lead

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- Number: US 5,217,027 A
- Document ID: US5217027A
- Status: Granted
- Kind: A
- Application number: 07/707,722
- Filed: 1991-05-30
- Granted: 1993-06-08
- Earliest claimed: 1991-05-30
- Assignees: Medtronic, Inc.
- Inventors: Martinus A. J. M. Hermens
- Web page: https://patentgrep.com/patent/US5217027A

## CPC

- A61N 1/0595: {Temporary leads}
- 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

A temporary cardiac lead for establishing electrical contact between a body tissue and a pulse generator. The lead includes a flexible conductor having a proximal end and a distal end. The proximal end of the conductor is connected to the pulse generator. An electrode is connected to the distal end of the connector for establishing electrical contact with the body tissue. A helical coil is secured to the electrode for frictionally resisting the movement of the lead relative to the body tissue. The coil has a generally rectangular cross-section, for giving it an overall flat configuration, in order to improve the positioning of the coil within the myocardial tissue, to dispense with auxiliary accessories such as silicon rubber discs, and to reduce the size of the lead and to render it adequate for use in atrial and pediatric applications.

## Claims

### Claim 1

A lead for establishing electrical contact between body tissue and a medical device, comprising:
a flexible, insulated conductor having a proximal end and a distal end;
means for electrically coupling the proximal end of said conductor to said medical device;
an electrode, coupled to the distal end of said conductor;
a length of surgical thread fixedly attached to said electrode, having a plurality of turns formed therein and having a flattened cross-section in a region including said turns; and
a needle attached to said length of surgical thread.

### Claim 2 (depends on 1)

A lead according to claim 1 wherein a segment of said surgical thread is formed into a helical coil and wherein said turns of said surgical thread comprise turns of said helical coil.

### Claim 3 (depends on 2)

A led according to claim 2 wherein said surgical thread is fabricated of an inert, biocompatible plastic.

### Claim 4 (depends on 1, 2, 3)

A lead according to claim 1 or claim 2 or claim 3 wherein said surgical thread has a generally circular cross-section other than in said region including said turns.

### Claim 5 (depends on 1, 2, 3)

A lead according to claim 1 or claim 2 or claim 3 wherein at least one of said turns formed in said surgical thread is provided with an indicator marking.