# US 2025/0143902 A1 · Urological chitosan stent and delivery system

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- Number: US 2025/0143902 A1
- Document ID: US20250143902A1
- Status: Published application
- Kind: A1
- Application number: 18/975,936
- Filed: 2024-12-10
- Published: 2025-05-08
- Earliest claimed: 2019-10-09
- Assignees: Olympus Corporation
- Applicants: Olympus Corporation
- Inventors: Moritz Koroschetz; Seiichi Ito
- Web page: https://patentgrep.com/patent/US20250143902A1

## CPC

- A61F 2/94: Stents retaining their form, i.e. not being deformable, after placement in the predetermined place
- A61F 2/958: Inflatable balloons for placing stents or stent-grafts
- A61F 2/9525: {using a funnel}
- A61F 2002/047: {Urethrae}
- A61F 2002/821: {Ostial stents}
- A61F 2210/0004: bioabsorbable
- A61F 2210/0076: multilayered, e.g. laminated structures
- A61F 2230/001: Figure-8-shaped, e.g. hourglass-shaped
- A61F 2250/0039: differing in diameter
- 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)

## Abstract

An apparatus includes a first layer, wherein the first layer comprises a scaffold structure forming an inner lumen along a length of the scaffold structure, and wherein the first layer comprises a bioresorbable material; a second layer on the first layer, wherein the second layer comprises a bioresorbable material configured to expand, wherein the second layer is positioned on the first layer such that ends of the first layer extend beyond ends of the second layer; and an expandable balloon located within a distal end of the inner lumen of the first layer.

## Claims

### Claim 1

(canceled)

### Claim 2

A method, comprising:
inserting an apparatus into a prostatic urethra of a patient, wherein the apparatus comprises at least one layer of a bioresorbable and expandable material; and
expanding the at least one layer to cause the at least one layer to press against an inner surface of the prostatic urethra, wherein expanding the at least one layer comprises exposing the at least one layer to a liquid draining through the prostatic urethra.

### Claim 3 (depends on 2)

The method of claim 2, further comprising serially coupling an applicator to a proximal end of the apparatus.

### Claim 4 (depends on 3)

The method of claim 3, wherein serially coupling the applicator to the proximal end of the apparatus comprises:
coupling, using a first sheath layer of a compression covering, a proximal end of the apparatus to the applicator;
covering, using a second sheath layer of the compression covering, the at least one layer; and
covering, using a third sheath layer of the compressing covering, from a distal end of the apparatus to the applicator.

### Claim 5 (depends on 2)

The method of claim 2, further comprising:
applying a fluid via an irrigation lumen of an applicator to the patient; and
draining the fluid via a drain lumen of the applicator to the patient.

### Claim 6 (depends on 2)

The method of claim 2, wherein exposing the at least one layer to the liquid draining through the prostatic urethra comprises removing a sheath layer at least partially serially coupling an applicator to a proximal end of the apparatus.

### Claim 7 (depends on 2)

The method of claim 2, further comprising:
expanding a balloon located within the apparatus.

### Claim 8 (depends on 7)

The method of claim 7, wherein expanding the balloon located within the apparatus comprises:
expanding the balloon such that at least a portion of the balloon extends distally beyond a distal end of the apparatus for engagement with surrounding tissue.

### Claim 9 (depends on 7)

The method of claim 7, wherein expanding the balloon located within the apparatus comprises:
expanding the balloon through an inner lumen of the apparatus by injection of a liquid or a gas.

### Claim 10 (depends on 2)

The method of claim 2, further comprising:
collapsing and retracting a balloon through an inner lumen of the apparatus.

### Claim 11 (depends on 2)

The method of claim 2, wherein the at least one layer is a first layer, wherein the apparatus comprises a second layer, the method further comprising:
expanding at least one of a distal end of the first layer or a proximal end of the first layer into a funnel shape.