Insertion/deployment catheter system for intrafallopian contraception

1. A contraceptive method comprising:

guiding a contraceptive device distally into an ostium of a fallopian tube wherein a sheath covers the contraceptive device;

avoiding perforation of the fallopian tube and facilitating tubal navigation of the fallopian tube with a distal ball tip of a distal portion of the contraceptive device, the ball tip having a diameter in a range from about 0.020 to about 0.050 inches;

uncovering the contraceptive device by withdrawing the sheath from the contraceptive device; and

releasing the uncovered contraceptive device so that the contraceptive device inhibits conception permanently.

2. The method of claim 1 , wherein the contraceptive device comprises an axially elongate flexible structure, and further comprising supporting an axially elongate flexible structure with the surrounding sheath during the guiding.

3. The method of claim 2 , further comprising supporting at least a portion of the axially elongate flexible structure with a core support disposed within an axially oriented lumen of the axially elongate flexible structure during the guiding.

4. The method of claim 3 , further comprising removing the core support during the releasing.

5. The method of claim 1 , further comprising maneuvering the contraceptive device into the ostium while the contraceptive device flexes laterally to track through the uterotubal junction.

6. The method of claim 1 , further comprising positioning the contraceptive device across the muscular isthmus of the uterotubal junction.

7. A contraceptive method comprising:

inserting a contraceptive device distally into an ostium of a fallopian tube;

uncovering the inserted contraceptive device by withdrawing a sheath from around the contraceptive device;

maintaining an expandable structure of the contraceptive device in a small profile configuration during the uncovering so as to avoid restricting movement of the sheath during the withdrawing;

radially expanding the uncovered expandable structure to a large profile configuration so as to affix the contraceptive device within the ostium; and

releasing the uncovered contraceptive device so that the contraceptive device inhibits contraception.

8. The contraceptive method of claim 7 , wherein the expandable structure is maintained in the small profile configuration by sustaining a restraint on the expandable structure between a first elongate body extending from a proximal handle to the expandable structure and a second elongate body extending from the proximal handle to the contraceptive device, whereby the restraint is releasable so as to expand the exposed expandable structure from the proximal handle.

9. The contraceptive method of claim 8 , wherein the first and second elongate bodies sustain a wind-down torque on the expandable structure, the radially expanding comprising actuating the proximal handle so as to release a proximal end of the expandable structure relative to a distal end of the expandable structure, and so that the expandable portion unwinds and expands.

10. A contraceptive method comprising:

guiding a contraceptive device distally into an ostium of a fallopian tube of a patient body wherein a sheath supports the contraceptive device, the contraceptive device comprising an elongate flexible structure;

uncovering the contraceptive device by withdrawing the sheath while maintaining an expandable structure of the proximal portion in a small profile configuration with a wind-down torque between first and second elongate bodies so as to avoid restricting movement of the sheath;

radially expanding the uncovered expandable structure to a large profile configuration so as to affix the contraceptive device within the ostium by actuating a proximal handle disposed outside the patient body, the proximal handle coupling proximal ends of the elongate bodies, so that the expandable portion unwinds and expands; and

releasing the uncovered contraceptive device so that the contraceptive device inhibits conception by rotating the first elongate body in a direction opposite the direction of the wind-down torque to decouple the first elongate body from the contraceptive device, and by removing a core support extending into an axial lumen of the contraceptive device.

11. The contraceptive method of claim 10 , wherein the wind-down torque twists the first elongate body in a first direction, and wherein the releasing comprises rotating the first elongate body in a second direction opposite the first direction to decouple the first elongate body from the contraceptive device.