# US 5,899,899 A · Cryosurgical linear ablation structure

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- Number: US 5,899,899 A
- Document ID: US5899899A
- Status: Granted
- Kind: A
- Application number: 08/893,825
- Filed: 1997-07-11
- Granted: 1999-05-04
- Earliest claimed: 1997-02-27
- Assignees: CryoCath Technologies Inc.
- Inventors: Steven G. Arless; Fredric L. Milder; Kenneth A. Spector; Dan Wittenberger; Domenic N. Santoianni; Claudia Lueckge
- Web page: https://patentgrep.com/patent/US5899899A

## CPC

- A61B 18/02: by cooling, e.g. cryogenic techniques
- A61B 2017/00243: {cardiac}
- A61B 2017/00292: {mounted on or guided by flexible, e.g. catheter-like, means}
- A61B 2017/00973: {pedal-operated}
- A61B 2018/00095: {high, i.e. heat conducting}
- A61B 2018/0212: {using an instrument inserted into a body lumen, e.g. catheter}
- A61F 2007/0298: {with a section for heating and a section for cooling}
- A61M 25/0029: {characterized by features relating to least one lumen located at the middle part of the catheter, e.g. slots, flaps, valves, cuffs, apertures, notches, grooves or rapid exchange ports (catheter shaft surface irregularities A61M2025/006)}
- A61M 2025/0039: {characterized by lumina being arranged coaxially}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- 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 cryogenic catheter includes a flexible member having an elongate, thermally-transmissive region and a cryogenic fluid path through the flexible member to the thermally-transmissive region. The thermally-transmissive region can be deformable from a linear configuration to an arcuate configuration and can include multiple thermally-transmissive elements having a first side exposed to the cryogenic fluid path and a second side exposed to points exterior to the flexible member. The thermally-transmissive elements can be rigid or flexible longitudinal strips. Alternatively, annular, cylindrical, or wedge-shaped metallic structures disposed in a spaced-apart relationship can define the thermally-transmissive region. In other embodiments the thermally-transmissive region is defined by a helical coil that is at least partially embedded in the flexible member. The helical coil can also define at least a portion of the cryogenic fluid path through the flexible member and include a gas expansion or boiling chamber.

## Claims

### Claim 1

A cryogenic cooling structure for use in the body comprising:
an elongate, thermally-transmissive region for producing a linear lesion within the body; and
a cryogenic fluid path through the elongate, thermally-transmissive region,
wherein flow of cryogenic fluid through the thermally-transmissive region causes a plurality of ice-balls to form within the body in a linear array proximate the elongate, thermally-transmissive region,
wherein the cryogenic cooling structure has a substantially fixed circumference, and
wherein the cryogenic cooling structure is substantially cylindrical and wherein the elongate, thermally-transmissive region includes a thermally-transmissive flexible material that transmits thermal energy through only a portion of the circumference of the cylindrical cryogenic cooling structure.

### Claim 2 (depends on 1)

The cryogenic cooling structure of claim 1, wherein the flexible material is supported by a supporting element when cryogenic fluid is flowing through the thermally-transmissive region.

### Claim 3 (depends on 2)

The cryogenic cooling structure of claim 2, wherein the supporting element includes a spring.

### Claim 4 (depends on 1)

The cryogenic cooling structure of claim 1, wherein the thermally-transmissive material comprises a material selected from the group consisting of polyamide, PET, and PTFE.

### Claim 5 (depends on 1)

The cryogenic cooling structure of claim 1, wherein the thermally-transmissive material has a thickness less than 0.006 inches.

### Claim 6 (depends on 1)

The cryogenic cooling structure of claim 1, further comprising an ECG ring proximate the thermally-transmissive region.