Benign prostatic hyperplasia treatment catheter with urethral cooling

• US 5,643,335 A
• Filed: 05/02/1996
• Issued: 07/01/1997
• Est. Priority Date: 07/08/1993
• Status: Expired due to Term

• Current Assignee: Auslo Research LLC
• Original Assignee: Urologix Inc.
• Inventors: Porter, Christopher H., Kauphusman, James V., Reid, John M., Neilson, Bruce H.
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US08/643,081
• Time in Patent Office: 425 Days
• Field of Search: 607/100-103, 607/96, 607/105, 607/113, 607/156
• US Class Current: 607/101
• CPC Class Codes: A61B 18/18 by applying electromagnetic radiation, e.g. microwaves radiation therapy A61N5/00
• CPC Class Codes: A61B 18/1815 using microwaves
• CPC Class Codes: A61N 5/02 using microwaves

Abstract

A system for treatment of benign prostatic hyperplasia within intraprostatic tissue surrounding a urethra is disclosed. The system includes an intraurethral catheter having an intraurethral catheter shaft. An antenna is located within the catheter shaft for delivering heat to the intraprostatic tissue surrounding the urethra. Coolant fluid is circulated through a chamber located between the catheter shaft and the urethral wall.

Claims

1. A method for treating a patient having benign prostatic hyperplasia within intraprostatic tissue surrounding a urethra, the method comprising:

inserting an intraurethral catheter having a catheter shaft into a prostatic portion of the urethra;

delivering heat from the catheter to the intraprostatic tissue surrounding the urethra;

supplying a fluid to a chamber to cool the urethra, the chamber defined by a substantially nondistensible sleeve bonded to spaced first and second regions of the catheter shaft which define opposite ends of a treatment region of the catheter shaft, the first and second regions having an outer diameter approximately equal to an inner diameter of the nondistensible sleeve and greater than an outer diameter of the treatment region of the catheter shaft; and

wherein the chamber exists regardless of pressure within the chamber.

2. The method of claim 1 wherein supplying a fluid comprises:

circulating the fluid from the catheter shaft through at least one aperture in the catheter shaft located adjacent the treatment region, thereby filling the substantially nondistensible sleeve, and through a return aperture in the catheter shaft, wherein the fluid returns to the catheter shaft.

3. A device for treating a patient having benign prostatic hyperplasia within intraprostatic tissue surrounding a urethra, the device comprising:

an intraurethral catheter having a catheter shaft, the catheter shaft having an outer surface and an outer diameter;

a first barrier formed on the outer surface of the intraurethral catheter, the first barrier having an outer diameter greater than the outer diameter of the intraurethral catheter;

a second barrier formed on the outer surface of the intraurethral catheter spaced from the first barrier, the second barrier having an outer diameter greater than the outer diameter of the intraurethral catheter;

an antenna located within the catheter shaft for delivering heat to the intraprostatic tissue surrounding the urethra;

a substantially nondistensible sleeve bonded to the first and second barriers by a first bond and a second bond so as to define a chamber between the sleeve and the outer surface of the shaft, the substantially nondistensible sleeve having an inner diameter greater than the outer diameter of the catheter shaft and approximately equal to the outer diameter of the first and second barriers; and

cooling means for cooling a portion of the urethra located between the first and second barriers and immediately surrounding the sleeve.

4. The device of claim 3 wherein the cooling means cools the portion of the urethra by circulating a fluid within the chamber defined by the first and second barriers and the substantially nondistensible sleeve.

5. The device of claim 3 wherein the substantially nondistensible sleeve is made of polyethylene terepthalate.

6. The device of claim 3 and further comprising:

at least one aperture in the catheter shaft located between the first and second barriers for circulating fluid into the chamber.

7. An intracavitary catheter comprising:

a catheter shaft having an outer surface, a first end for insertion into a body cavity, a second end opposite the first end and a treatment region near the first end, the outer surface including spaced first and second regions which define opposing ends of the treatment region of the catheter shaft, the first and second regions having an outer diameter greater than an outer diameter of the treatment region of the catheter shaft;

a substantially nondistensible sleeve bonded to the first and second regions of the catheter shaft so as to define a chamber in the treatment region, the substantially nondistensible sleeve having an inner diameter approximately equal to the outer diameter of the first and second regions;

an energy emitting element positioned within the intracavity catheter adjacent to the treatment region; and

means within the shaft for providing a fluid to the chamber.

8. The catheter of claim 7 wherein the substantially nondistensible sleeve is formed of polyethylene terepthalate material.

9. The catheter of claim 7 and further comprising:

at least one aperture in the catheter shaft for permitting fluid to fill the chamber.