Benign prostatic hyperplasia treatment catheter with urethral cooling

• US 5,464,437 A
• Filed: 07/08/1993
• Issued: 11/07/1995
• 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:
  US08/088,901
• Time in Patent Office: 852 Days
• Field of Search: 607/100-102, 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 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 intraurethral catheter to the intraprostatic tissue surrounding the urethra;

defining a chamber between the urethra and the catheter shaft; and

supplying a fluid to the chamber between the urethra and the catheter shaft such that the fluid comes in direct contact with the urethra to cool the urethra.

2. The method of claim 1 wherein delivering heat to the intraprostatic tissue comprises generating an electromagnetic emission from an antenna located within the catheter shaft.

3. The method of claim 2 wherein the step of delivering heat includes heating the intraprostatic tissue to a temperature above approximately 45°

C.

4. The method of claim 1 wherein defining a chamber comprises inflating a first balloon positioned between the catheter shaft and the urethra and a second balloon positioned between the catheter shaft and the urethra and located distally of the first balloon.

5. The method of claim 4 wherein supplying a fluid comprises:

circulating the fluid from the catheter shaft through at least one aperture in the catheter shaft located between the first and second balloons, wherein the fluid fills the chamber and comes in direct contact with the urethra, and through a return aperture in the catheter shaft, wherein the fluid returns to the catheter shaft.

6. The method of claim 4 wherein supplying a fluid comprises:

circulating the fluid from the catheter shaft into the first balloon, through at least one aperture in the first balloon, wherein the fluid fills the chamber and comes in direct contact with the urethra, and through a return aperture in the catheter shaft, wherein the fluid returns to the catheter shaft.

7. The method of claim 6 wherein supplying a fluid further comprises:

circulating the fluid from the catheter shaft into the second balloon, through at least one aperture in the second balloon, wherein the fluid fills the chamber and comes in direct contact with the urethra, and through a return aperture in the catheter shaft, wherein the fluid returns to the catheter shaft.

8. The method of claim 4 wherein supplying a fluid comprises:

circulating the fluid from the catheter shaft into the first balloon, through a valved end of the first balloon, wherein the fluid fills the chamber and comes in direct contact with the urethra, and through a return aperture in the catheter shaft, wherein the fluid returns to the catheter shaft.

9. The method of claim 8 wherein supplying a fluid further comprises:

circulating the fluid from the catheter shaft into the second balloon, through a valved end of the second balloon, wherein the fluid fills the chamber and comes in direct contact with the urethra, and through a return aperture in the catheter shaft, wherein the fluid returns to the catheter shaft.

10. A device for treating intraprostatic tissue surrounding a urethra, the device comprising:

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

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

a first balloon located adjacent the outer surface of the catheter shaft for creating a first barrier between the catheter shaft and the urethra;

a second balloon located adjacent the outer surface of the catheter shaft for creating a second barrier between the catheter shaft and the urethra; and

circulating means for circulating a fluid within a chamber defined by the first barrier, the second barrier, the outer surface of the catheter shaft and the urethra such that the fluid comes in direct contact with the urethra.

11. The device of claim 10 wherein the circulating means further comprises a fluid circulating system, the fluid circulating system being capable of circulating a fluid within the chamber.

12. The device of claim 10 and further comprising:

a mesh braid connected to the outer surface of the catheter shaft between the first and second balloons for maintaining the chamber.

13. A method for treating 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 intraurethral catheter to the intraprostatic tissue surrounding the urethra; and

providing a cooling fluid through a chamber adjacent to the prostatic portion of the urethra such that the fluid comes in direct contact with the urethra, the chamber being defined by the catheter shaft and the urethra.

14. The method of claim 13 wherein the step of providing a cooling fluid further comprises:

inflating a first balloon between the catheter shaft and the urethra;

inflating a second balloon between the catheter shaft and the urethra; and

providing the cooling fluid between the first and second balloons adjacent to the prostatic portion of the urethra.

15. The method of claim 14 wherein the step of providing a cooling fluid further comprises:

circulating the fluid from the catheter shaft into the first balloon, through at least one aperture in the first balloon, wherein the fluid fills the chamber and comes in direct contact with the urethra, and through a return aperture in the catheter shaft, wherein the fluid returns to the catheter shaft.

16. The method of claim 14 wherein the step of providing a cooling fluid further comprises:

circulating the fluid from the catheter shaft into the second balloon, through at least one aperture in the second balloon, wherein the fluid fills the chamber and comes in direct contact with the urethra, and through a return aperture in the catheter shaft, wherein the fluid returns to the catheter shaft.

17. The method of claim 14 wherein the step of providing a cooling fluid further comprises:

circulating the fluid from the catheter shaft into the first balloon, through a valve in the first balloon, wherein the fluid fills the chamber and comes in direct contact with the urethra, and through a return aperture in the catheter shaft, wherein the fluid returns to the catheter shaft.

18. The method of claim 14 wherein the step of providing a cooling fluid further comprises:

circulating the fluid from the catheter shaft into the second balloon, through a valve in the second balloon, wherein the fluid fills the chamber and comes in direct contact with the urethra, and through a return aperture in the catheter shaft, wherein the fluid returns to the catheter shaft.

19. A method for treating 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 intraurethral catheter to the intraprostatic tissue surrounding the urethra;

inflating a first balloon positioned between the catheter shaft and the urethra;

inflating a second balloon positioned between the catheter shaft and the urethra, the second balloon located distally of the first balloon; and

circulating a fluid from the catheter shaft through at least one aperture in the catheter shalt located between the first and second balloons, wherein the fluid fills the chamber and comes in direct contact with the urethra, and through a return aperture in the catheter shaft, wherein the fluid returns to the catheter shaft.