# US 12,109,092 B2 · Restoring force preserving portion-bonded medical tape and method for manufacturing the same

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- Number: US 12,109,092 B2
- Document ID: US12109092B2
- Status: Granted
- Kind: B2
- Application number: 17/759,190
- Filed: 2022-03-17
- Published: 2024-03-14
- Granted: 2024-10-08
- Earliest claimed: 2021-04-13
- Applicants: Yugenkaisha Chouryu
- Inventors: Toshifumi Hirashima
- Web page: https://patentgrep.com/patent/US12109092B2

## CPC

- A61F 13/0283: {for making adhesive or cohesive tape or fabrics therefor, e.g. coating or mechanical treatments}
- A61F 13/02: Adhesive bandages or dressings
- A61F 13/0269: {Tapes for dressing attachment (for stoma bags A61F5/443; for nappies or sanitary towels A61F13/58; wound closure tapes A61B17/085; for surgical drapes A61B46/00; attaching catheters A61M25/02)}
- A61L 15/22: containing macromolecular materials
- A61L 15/26: Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof {(A61L15/225 takes precedence)}
- A61L 15/42: Use of materials characterised by their function or physical properties (liquid bandages A61L26/00)
- A61L 15/58: Adhesives
- 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)
- 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)

## Abstract

Provided is a medical tape that has a high effect of alleviating a persistent skin irritation during an application duration caused by a residual shrink force associated with a forming shrinkage. A medical tape includes an elastic base member portion film-formed of a solution polymer and having an elastic function, a restoring force preserving portion having inelastic, flexible, and restorable functions, an adhesion portion having a function to apply and hold the elastic base member portion on a skin, and a release portion having a function to protect the adhesion portion. The restoring force preserving portion, the elastic base member portion, the adhesion portion, and the release portion are laminated in this order from an upper layer.

## Claims

### Claim 1

A method for manufacturing a medical tape, comprising:
applying a solution polymer serving as an elastic base member portion having an elastic function to an upper layer of a restoring force preserving portion bent into a shape or shape having a projected cross-sectional shape by an external force and simultaneously performing a film formation of the elastic base member portion and a lamination of the restoring force preserving portion and the elastic base member portion to complete the film formation, obtaining the elastic base member portion, and obtaining a shaped or shaped two-layer structure having a projected cross-sectional shape, the two-layer structure being composed of the restoring force preserving portion and the elastic base member portion; and
subsequently, removing the external force applied to the restoring force preserving portion to exert a restorability that the restoring force preserving portion has and obtaining a two-layer structure composed of the elastic base member portion and the restoring force preserving portion, the elastic base member portion being in a state where a residual shrink force generated in association with a forming shrinkage of the solution polymer is reduced by a restoring force associated with a shape change in a direction opposite to the residual shrink force generated in association with the forming shrinkage of the solution polymer.