Method and apparatus for tubal occlusion

1. A device for sterilization of a female comprising:

a catheter having a distal end adapted for insertion through the vagina and cervical canal and into the uterine tube of the female;

a detachable nonexpandable plug releasably mounted to the distal end of the catheter;

means for applying energy to the uterine tube, through the plug; and

a release mechanism capable of releasing the non-expandable plug from the distal end of the catheter;

wherein said plug is configured to fit entirely within the uterine tube and wherein said means for applying energy is capable of applying energy to the plug sufficient to cause damage to the uterine tube.

2. The device of claim 1 wherein the plug comprises an insulator and an electrode mounted in the insulator, and the means for applying energy comprises a source of electrical energy coupled to the electrode.

3. The device of claim 1 wherein the plug comprises a resistive heating element, and the means for applying energy comprises a source of electrical energy coupled to the resistive heating element.

4. The device of claim 1 wherein the plug comprises a laser heating tip, and the means for applying energy comprises a source of laser energy coupled to the laser heating tip.

5. The device of claim 1 wherein the plug comprises a piezo-electric crystal, and the means for applying energy comprises a source of electrical energy coupled to the crystal.

6. A device for sterilization of a female comprising:

a catheter having a distal end adapted for insertion through the vagina and cervical canal and into the uterotubal junction of the female;

a detachable no-expandable plug releasably mounted to the distal end of the catheter;

means for applying energy to the uterotubal junction, through the plug; and

a release mechanism capable of releasing the no-expandable plug from the distal end of the catheter;

wherein said plug is configured to fit entirely within the uterotubal junction and wherein said means for applying energy is capable of applying energy to the plug sufficient to cause damage to the uterotubal junction.

7. The device of claim 6 wherein the plug comprises an insulator and an electrode mounted in the insulator, and the means for applying energy comprises a source of electrical energy coupled to the electrode.

8. The device of claim 6 wherein the plug comprises a resistive heating element, and the means for applying energy comprises a source of electrical energy coupled to the resistive heating element.

9. The device of claim 6 wherein the plug comprises a laser heating tip, and the means for applying energy comprises a source of laser energy coupled to the laser heating tip.

10. The device of claim 6 wherein the plug comprises a piezo-electric crystal, and the means for applying energy comprises a source of electrical energy coupled to the crystal.

11. A device for sterilization of a female comprising:

a catheter having a distal end adapted for insertion through the vagina and cervical canal and into the uterus of the female;

a detachable non-expandable plug with at least one electrode mounted on the plug wherein the plug is releasably mounted to the distal end of the catheter; and

a release mechanism capable of releasing the no-expandable plug from the distal end of the catheter;

wherein said plug is configured to fit within the uterotubal junction and wherein said electrode is capable of applying energy to the plug sufficient to cause damage to the uterotubal junction.

12. The device of claim 11 wherein the release mechanism is comprised of:

at least one tang extending from the plug into the catheter, said tang being resiliently biased toward the center of the catheter;

at least one receiving hole disposed within the catheter near the distal end of the catheter for receiving the tang to lock the plug to the catheter;

a slidable core extending from the proximal end of the catheter to the distal end of the catheter, said slidable core having a distal end with a first diameter, said slidable core disposed within the catheter and extending into obstructing relationship with the tang, thereby preventing the tang from resiliently bending toward the center of the catheter when obstructed by the core and maintaining the tang engaged with the receiving hole, said slidable core being slidable distally to move out of obstructing relationship with the tang;

a bore within the plug, said bore having a first diameter; and

a distally extending segment on the core, said distally extending segment extending from the distal end and having a second diameter smaller than the first diameter of the distal end, said second diameter sufficient to permit the distally extending segment to fit within the bore of the electrode.

13. The device of claim 11 where in the plug is comprised of porous material.

14. The device of claim 11 wherein the plug has at least one electrode operable as a monopolar electrode.

15. The device of claim 11 wherein the plug comprises at least two electrodes operable as bipolar electrodes.

16. The device of claim 11 further comprising a power source capable of applying RF energy to the plug sufficient to cause damage to the uterotubal junction.

17. The device of claim 11 wherein the release mechanism is capable of transferring RF energy to the electrode.

18. The device of claim 11 wherein the plug further comprises an in-growth promoting compound.

19. A device for sterilization of a female comprising:

a catheter having a detachable non-expanding plug releasably mounted on the distal end of the catheter; and

a release mechanism capable of releasing the plug from the distal end of the catheter;

wherein said plug is configured to fit within the uterotubal junction and wherein an electrode in the plug is capable of applying energy to the plug sufficient to cause damage to the uterotubal junction;

wherein the release mechanism comprises at least one tang extending from the plug into the catheter, said tang being resiliently biased toward the center of the catheter;

at least one receiving hole disposed within the catheter near the distal end of the catheter for receiving the tang to lock the plug to the catheter;

a slidable core extending from the proximal end of the catheter to the distal end of the catheter, said slidable core having a distal end with a first diameter, said slidable core disposed within the catheter and extending into obstructing relationship with the tang, thereby preventing the tang from resiliently bending toward the center of the catheter when obstructed by the core and maintaining the tang engaged with the receiving hole, said slidable core being slidable distally to move out of obstructing relationship with the tang;

a bore within the plug, said bore having a first diameter; and

a distally extending segment on the core, said distally extending segment extending from the distal end and having a second diameter smaller than he first diameter of the distal end, said second diameter sufficient to permit the distally extending segment to fit within the bore of the electrode.

20. The device of claim 19 further comprising:

a bore within the plug;

at least one electrical contact extending from the electrode, through the plug towards the bore of the plug, and adapted to be in electrical contact with the core;

wherein the distal end of the core is adapted for insertion into the bore and into the electrical contact with the at least one electrical contact.

21. The device of claim 20 where in the plug is comprised of porous material.

22. The device of claim 20 wherein the plug has at least one electrode operable as a monopolar electrode.

23. The device of claim 20 wherein the plug comprises at least two electrodes operable as bipolar electrodes.

24. The device of claim 20 further comprising a power source capable of applying RF energy to the plug sufficient to cause damage to the uterotubal junction.

25. The device of claim 20 wherein the release mechanism is capable of transferring RF energy to the electrode.

26. The device of claim 20 wherein the plug further comprises an in-growth promoting compound.