# US 5,344,399 A · Dual flexible introducer and cannula

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- Number: US 5,344,399 A
- Document ID: US5344399A
- Status: Granted
- Kind: A
- Application number: 08/027,506
- Filed: 1993-03-05
- Granted: 1994-09-06
- Earliest claimed: 1992-05-26
- Assignees: DLP Limited
- Inventors: James H. DeVries
- Web page: https://patentgrep.com/patent/US5344399A

## CPC

- A61M 25/09033: {with fixed mandrils, e.g. mandrils fixed to tip; Tensionable wires}
- A61M 2025/09091: {where a sheath surrounds the coil at the distal part}
- A61M 2025/09175: {having specific characteristics at the distal tip}
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

A removable stylet for use in the introduction of cannulae into a vessel or chamber of a body for medical procedures, and a retrograde coronary sinus perfusion cannula using such stylet. The stylet is used to guide the cannula during insertion, and includes a proximal relatively stiff end that can be manually manipulated by the attending physician to guide the stylet. On the distal end of the stylet is a relatively flexible portion that can be shaped into various curves and which is form-retaining while retaining flexibility.

## Claims

### Claim 1

An introducer stylet for medical cannulation comprising:
a handle for manipulation by a user,
elongated guide means affixed to and extending from said handle, said guide means being of shape-retaining malleable construction and of uniform construction and geometry throughout its length, and
a tube that is affixed to and extends from said handle closely surrounding said guide means for substantial portion less than the entire length of said guide means for stiffening that portion of said guide means surrounded by said tube and thereby provide a stylet having a stiff portion adjacent to said handle and a malleable shape-retaining portion remote from said handle.

### Claim 2 (depends on 1)

The stylet set forth in claim 1 wherein said guide means comprises a length of malleable wire.

### Claim 3 (depends on 2)

The stylet set forth in claim 2 wherein said guide means further comprises a tightly coiled spring that surrounds said length of malleable wire.

### Claim 4 (depends on 1)

The stylet set forth in claim 1 wherein said tube surrounds said guide means for substantially 1/3 of the length of said guide means.

### Claim 5 (depends on 1)

A retrograde coronary sinus perfusion cannula that comprises:
an elongated flexible tube with a central perfusion lumen and an integral side lumen for pressure monitoring,
an inflatable cuff that encircles the distal end of said tube, and
an introducer stylet as set forth in claim 1 removably received in said central lumen.

### Claim 6

A retrograde coronary sinus perfusion cannula that comprises:
an elongated flexible tube with a central perfusion lumen and an integral side lumen for pressure monitoring,
an inflatable cuff that encircles the distal end of said tube, and
an introducer stylet removably received into the proximal end of said central lumen, said introducer stylet having a handle, a relatively rigid proximal portion adjacent to said handle, and a relatively flexible shape-retaining distal portion remote from said handle.