Viscoelastic composition

Patent metadata

Field	Value
Publication number	US-11458229-B2
Application number	US-201615764243-A
Country	US
Kind code	B2
Filing date	Sep 28, 2016
Priority date	Sep 30, 2015
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

The purpose of the present invention is to provide a viscoelastic composition having excellent operability, which is suitable for use in securing the field of view of an endoscope when opaque dark-colored liquid accumulates inside a canal and obstructs the field of view of the endoscope, the viscoelastic composition securing the field of view by pushing the liquid aside, and to provide a method for securing the field of view of an endoscope using the viscoelastic composition. The viscoelastic composition for securing the field of view of an endoscope comprises a substance having viscoelastic properties and water, preferably has a hardness of 550 N/m2 or less, a viscosity (25° C.) of 200 to 2,000 mPa·s, and a loss tangent of 0.6 or less, and more preferably has an electrical conductivity of 250 μS/cm or less. The method for securing the field of view of an endoscope comprises feeding the viscoelastic composition from a proximal part of the endoscope, through a channel, into a distal part of the endoscope.

First claim

What is claimed is:

1. A method for securing the field of view of an endoscope, the method comprising feeding a viscoelastic composition comprising a thickening substance and water and having a loss tangent of 0.6 or less from a proximal part of the endoscope, through a channel, into a distal part of the endoscope so as to physically push aside or remove dark-colored liquid or a semi-solid material accumulated inside a canal, thereby securing the field of view of the endoscope.

2. The method according to claim 1 , wherein the endoscope is a medical endoscope.

3. The method of claim 1 , wherein the viscoelastic composition has a hardness of 550 N/m 2 or less and a viscosity at 25° C. of 200 to 2,000 mPa·s.

4. The method according to claim 3 , wherein the endoscope is a medical endoscope.

5. The method of claim 3 , wherein the viscoelastic composition has an electrical conductivity of 250 pS/cm or less .

6. The method according to claim 5 , wherein the endoscope is a medical endoscope.

7. The method of claim 1 , wherein the viscoelastic composition has an electrical conductivity of 250 pS/cm or less .

8. The method according to claim 7 , wherein the endoscope is a medical endoscope.

9. The method according to claim 1 , wherein the thickening substance comprises a polysaccharide or a hydrophilic polymer.

10. The method according to claim 3 , wherein the thickening substance comprises a polysaccharide or a hydrophilic polymer.

11. The method according to claim 5 , wherein the thickening substance comprises a polysaccharide or a hydrophilic polymer.

12. The method according to claim 7 , wherein the thickening substance comprises a polysaccharide or a hydrophilic polymer.

Assignees

• Univ Jichi Medical
• Otsuka Pharma Factory Inc

Inventors

• Yano Tomonori
• OHHATA Atsushi
• Goto Toshihiro
• Hiraki Yuji

Classifications

• A61L31/14

  Materials characterised by their function or physical properties {, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials} · CPC title

• A61L31/028

  Other inorganic materials not covered by A61L31/022 - A61L31/026 · CPC title

• A61B1/015

  Control of fluid supply or evacuation · CPC title

• A61L31/042 Primary

  Polysaccharides · CPC title

• A61L31/005

  Ingredients of undetermined constitution or reaction products thereof · CPC title