# US 11,123,519 B2 · Layered tube for improved kink resistance

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- Number: US 11,123,519 B2
- Document ID: US11123519B2
- Status: Granted
- Kind: B2
- Application number: 15/386,461
- Filed: 2016-12-21
- Published: 2018-06-21
- Granted: 2021-09-21
- Earliest claimed: 2016-12-21
- Assignees: Biosense Webster (Israel) Ltd.
- Applicants: Biosense Webster (Israel) Ltd.
- Inventors: Christopher Thomas Beeckler
- Web page: https://patentgrep.com/patent/US11123519B2

## CPC

- A61M 25/0045: {multi-layered, e.g. coated (coating materials A61L29/08)}
- A61L 29/02: Inorganic materials
- A61L 29/085: {Macromolecular materials}
- A61M 25/0009: {Making of catheters or other medical or surgical tubes}
- A61M 25/005: {with embedded materials for reinforcement, e.g. wires, coils, braids}
- A61M 25/0141: {having flexible regions as a result of using materials with different mechanical properties}
- B29C 39/18: incorporating preformed parts or layers, e.g. casting around inserts or for coating articles {(B29C39/206 takes precedence)}
- B29C 48/10: flexible, e.g. blown foils
- B29C 48/151: Coating hollow articles
- B29C 48/154: Coating solid articles, i.e. non-hollow articles
- B29C 48/21: the layers being joined at their surfaces
- B29C 48/23: with means for avoiding adhesion of the layers, e.g. for forming peelable layers
- A61L 2420/08: Coatings comprising two or more layers
- A61M 2025/0047: {the inner layer having a higher lubricity}
- A61M 2025/0048: {with an outer layer made from silicon}
- B29C 39/146: {for making multilayered articles}
- B29C 48/08: flexible, e.g. films
- B29C 48/09: Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C 48/18: the components being layers
- B29K 2023/0683: {UHMWPE, i.e. ultra high molecular weight polyethylene}
- B29K 2077/00: Use of {PA, i.e.} polyamides, e.g. polyesteramides {or derivatives thereof}, as moulding material
- B29K 2079/08: {PI, i.e. polyimides or derivatives thereof}
- B29L 2031/7542: {Catheters}
- 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)}
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A catheter shaft is produced by forming a first polymeric layer onto a flexible inner core while maintaining the inner core in a solid state, and solidifying the first polymeric layer, wherein the solidified first polymeric layer fails to bond with the inner core and is slidable thereon upon flexion of the shaft. A second polymeric layer may be formed over the first polymeric layer, and is slidable thereon when the shaft bends.

## Claims

### Claim 1

A catheter shaft, comprising:
a flexible inner core including a circumference;
a first polymeric layer formed onto the flexible inner core such that the first polymeric layer includes an inner surface that contacts an entirety of the circumference; and
a second polymeric layer formed onto and in contact with the first polymeric layer, wherein upon flexion of the flexible inner core, the first polymeric layer is slidable relative to the flexible inner core and the second polymeric layer,
in which the catheter shaft comprises a portion of a medical catheter suitable for inserting into a patient.

### Claim 2 (depends on 1)

The catheter shaft according to claim 1, wherein the first polymeric layer and the second polymeric layer are formed by extrusion.

### Claim 3 (depends on 1)

The catheter shaft according to claim 1, wherein the first polymeric layer and the second polymeric layer are formed by film casting.

### Claim 4 (depends on 1)

The catheter shaft according to claim 1, wherein a kinetic coefficient of friction between the first polymeric layer and the second polymeric layer does not exceed 0.5.

### Claim 5 (depends on 1)

The catheter shaft according to claim 1 wherein the first polymeric layer and the second polymeric layer are composed of identical materials.

### Claim 6 (depends on 5)

The catheter shaft according to claim 5, wherein the first polymeric layer and the second polymeric layer are composed of polyimide.

### Claim 7 (depends on 1)

The catheter shaft according to claim 1 wherein the first polymeric layer and the second polymeric layer are composed of different materials.

### Claim 8 (depends on 7)

The catheter shaft according to claim 7, wherein one of the first polymeric layer and the second polymeric layer is ultra-high-molecular-weight polyethylene and another of the first polymeric layer and the second polymeric layer is polyether block amide.

### Claim 9 (depends on 1)

The catheter shaft according to claim 1, wherein the flexible inner core comprises a metallic braid.