# US 2019/0314618 A1 · Double-layered drainage tube

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0314618 A1
- Document ID: US20190314618A1
- Status: Published application
- Kind: A1
- Application number: 16/473,178
- Filed: 2017-10-11
- Published: 2019-10-17
- Earliest claimed: 2016-12-26
- Assignees: Innovex Medical Co., Ltd.
- Applicants: Innovex Medical Co., Ltd.
- Inventors: Zhongwei Zheng; Biao Gong; Qing Yuan; Pan Wang; Hang Yan
- Web page: https://patentgrep.com/patent/US20190314618A1

## CPC

- A61L 29/16: Biologically active materials, e.g. therapeutic substances {(A61L29/048 takes precedence)}
- A61M 27/002: {Implant devices for drainage of body fluids from one part of the body to another (intraocular A61F9/00781; middle ear A61F11/202)}
- A61L 29/041: {obtained by reactions only involving carbon-to-carbon unsaturated bonds}
- A61L 29/049: {Mixtures of macromolecular compounds}
- A61L 29/06: obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- A61L 29/085: {Macromolecular materials}
- A61L 29/14: Materials characterised by their function or physical properties {, e.g. lubricating compositions}
- A61M 25/00: Catheters; Hollow probes (dilators A61M29/00; {peritoneal catheters A61M1/285; tracheal tubes A61M16/04; for drainage A61M27/00; for uterus, vagina or rectum A61M31/00} ; for measuring or testing A61B; {materials for catheters A61L29/00})
- A61M 25/0068: {Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure}
- A61M 2210/1075: Gall bladder
- 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)
- 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 double-layered drainage tube, composed of an inner layer and an outer layer closely attached to each other is shown. The inner layer is made of a hydrophobic material, and the outer layer is made of a human biocompatible material. Liquids do not adhere to the inner wall, thereby preventing tube clogging. The outer wall is soft and elastic, has a smooth surface, and has a good compatibility with body tissues without causing inflammation. Moreover, in the case where there is no middle layer of a stainless steel wire, the diameter and cost of an outer tube are reduced and the insertion difficulty is reduced, and the inner diameter of the drainage tube is increased, and the effective drainage cross-sectional area of the drainage tube is increased.

## Claims

### Claim 1

A double-layered drainage tube, wherein it is composed of an inner layer and an outer layer closely attached to each other, the inner layer is made of hydrophobic material, the outer layer is made of human biocompatible material.

### Claim 2 (depends on 1)

The drainage tube as claimed in claim 1, wherein the human biocompatible material is selected from one or more of polyurethane, polyethylene, silicone rubber or polyamide.

### Claim 3 (depends on 1)

The drainage tube as claimed in claim 1, wherein the human biocompatible material is a polyurethane.

### Claim 4 (depends on 1)

The drainage tube as claimed in claim 1, wherein a thickness ratio of the outer layer and the inner layer is 10˜1000:1.

### Claim 5 (depends on 1)

The drainage tube as claimed in claim 1, wherein the hydrophobic material is a fluoropolymer.

### Claim 6 (depends on 5)

The drainage tube as claimed in claim 5, wherein the fluoropolymer is a polytetrafluoroethylene or fluorinated ethylene propylene copolymer.

### Claim 7 (depends on 1)

The drainage tube as claimed in claim 1, wherein a hardness of the human biocompatible material is from 85A to 70D.

### Claim 8 (depends on 1)

The drainage tube as claimed in claim 1, wherein the outer layer is further coated with a functional coating, and the functional coating is a hydrophilic coating and/or bioactive coating.

### Claim 9 (depends on 1)

The drainage tube as claimed in claim 1, wherein the drainage tube is one of a straight type, a ⅓ bend type, a middle bend type, a horn type or a pig tail type.

### Claim 10 (depends on 1)

The drainage tube as claimed in claim 1, wherein the drainage tube is provided with a development mark.