Ureteral stent

• US 7,731,676 B2
• Filed: 08/02/2006
• Issued: 06/08/2010
• Est. Priority Date: 08/03/2005
• Status: Expired due to Fees

• Current Assignee: Toru Maeda
• Original Assignee: Toru Maeda
• Inventors: Maeda, Toru
• Primary Examiner(s): Deak; Leslie R
• Application Number:
  US11/497,245
• Publication Number:
  US 20070032880A1
• Time in Patent Office: 1,406 Days
• Field of Search: 604 7- 10, 604/540, 604/544, 604/264, 606/153, 606/127
• US Class Current: 604/8
• CPC Class Codes: A61M 27/008 pre-shaped, for use in the urethral or ureteral tract

Abstract

A ureter stent designed for assisting the draining of urine with calculus fragments. The ureter stent includes a first holding portion, a second holding portion and a junction portion. The first holding portion has a pigtail shape for holding itself in a kidney. The second holding portion has a pigtail shape for holding itself in a bladder. The junction portion joins the first holding portion and the second holding portion and placed in a ureter. The junction portion is made of a metal round wire having no internal flow path. Urine flows outside the ureter stent.

Claims

1. A ureteral stent set comprising:

a ureteral stent;

a sleeve; and

a pusher,

wherein said ureteral stent includes;

a first holding portion configured to prevent the stent from displacing from a kidney by hanging a junction of renal pelvis and ureter when placed in the renal pelvis;

a second holding portion configured to prevent the stent from displacing from a bladder by hanging a ureterovesical junction when placed in the bladder; and

a junction portion having a solid-core round wire which joins said first holding portion and said second holding portion,

wherein a longitudinal direction of said round wire is substantially conforming with the ureter when placed in the ureter, and

a tube-shaped second ureteral stent having a flow path through which urine flows, said second ureteral stent having a first holding portion configured to prevent the second stent from displacing from a kidney and a second holding portion configured to prevent the second stent from displacing from a bladder, said second stent being sized to allow the external surface of said ureteral stent is slidably fit into an internal path of said second ureteral stent; and

said sleeve is configured to have a tube shape having an internal path through which said ureteral stent is guided into a human body and said first holding portion is guided into a kidney, and

said pusher is configured to push said ureteral stent along said internal path.

2. The ureteral stent according to claim 1, wherein said round wire is made of metal.

3. The ureteral stent according to claim 1, wherein a cross section of said round wire in a direction perpendicular to a longitudinal direction of said round wire forms a convex domain.

4. The ureteral stent according to claim 1, wherein a size of said round wire is equal to or less than 4 French.

5. The ureteral stent according to claim 1, wherein said round wire is covered by a winding wire.

6. The ureteral stent according to claim 1, wherein said round wire is covered by braided material.

7. The ureteral stent according to claim 1, further comprising an auxiliary wire fixed to said round wire at a first point and a second point, and a length between said first point and said second point along said auxiliary wire is larger than a length between said first point and said second point along said round wire.

8. The ureteral stent according to claim 1, further comprising:

a wavy round wire joined to said round wire at a first point near said first holding portion and a second point near said second holding portion, and

a shape of said wavy round wire is waveform, a direction of an amplitude of said waveform is substantially perpendicular to a longitudinal direction of said round wire.

9. The ureteral stent according to claim 1, wherein said junction portion includes a helical portion,

wherein a central axis of helix included in the shape of said helical portion is substantially parallel to a line connecting a junction of said junction portion and said first holding portion and a junction of said second holding portion and said junction portion.

10. The ureteral stent according to claim 1, wherein said junction portion includes a second wire which is made of metal and parallel contacts parallel with said round wire when said round wire is straightened.

11. The ureteral stent according to claim 1, wherein an area of a surface of said ureteral stent is covered by fluoride resin.

12. The ureteral stent according to claim 1, wherein a surface of said ureteral stent has colored zones arranged in a length direction of said ureteral stent.

13. The ureteral stent according to claim 1, wherein a shape of said first holding portion is a pig tail shape.

14. The ureteral stent according to claim 1, wherein a shape of said first holding portion is helical.

15. The ureteral stent according to claim 14, wherein a central axis of said helical shape of said first holding portion is substantially parallel to a longitudinal direction of said round wire when said ureteral stent is free from external force.

16. The ureteral stent according to claim 14, wherein a central axis of said helical shape of said first holding portion is substantially perpendicular to a longitudinal direction of said round wire when said ureteral stent is free from external force.