Systems and methods for endometrial ablation
An endocervical seal has a sleeve with a passageway for receiving an intrauterine interventional or diagnostic tool. The sleeve has a coaxially disposed outer balloon with a distal portion configured to inflate in a cervical os and a proximal portion configured to inflate in a cervical canal.
1. A system for uterine cavity treatments, comprising:
a seal assembly having a seal assembly length and extending along an axis and adapted to be introduced into an endocervical canal in a reduced cross-section configuration and to be immobilized in the canal in an expanded cross-section configuration, said seal assembly having a central passage;
an axially extending probe shaft received through the central passage in the seal assembly, wherein the probe shaft carries a distal expandable-collapsible energy-delivery surface having an energy-delivery surface length; and
a plurality of axial markings comprising numbers along the probe shaft for indicating the axial position of the distal expandable-collapsible energy-delivery surface relative to the seal assembly in a cervical canal, wherein a first axial marking is positionable on the shaft at a distance from a distal tip of the energy-delivery surface equal to a sum of the seal assembly length and the energy-delivery surface length and a plurality of additional axial markings are positioned proximally of the first axial marking where the numbers represent distances proximal of the first axial marking.
2. The system of claim 1 further comprising an electrical system configured to enable a signal to indicate an axial relationship between the seal assembly and the distal expandable-collapsible energy-delivery surface.
3. The system of claim 2 wherein the electrical system includes electrical circuit components in the probe shaft.
4. The system of claim 2 wherein the electrical system includes an electrical component in the seal assembly.
5. The system of claim 1 wherein the seal assembly has first and second expanded cross-sections that are expanded by fluid inflation.
6. The system of claim 5 wherein the first cross-section has proximal and medial portions and the second expanded cross-section is larger than the first cross-section.
7. The system of claim 1 wherein the markings include colors.
8. The system of claim 1 further comprising a locking mechanism carried by the seal assembly for selectively locking the seal assembly to the probe shaft.
9. A method of delivering energy into the wall of a uterine cavity having an internal os at a distal end of an endocervical canal, said method comprising
positioning a seal assembly in the endocervical canal;
observing markings on an introducer shaft of a probe positioned through a central passage in the seal assembly shaft with reference to the internal os to insure that a distal end of the probe does not extend beyond a previous measurement of a length of the uterine cavity;
expanding a distal expandable-collapsible energy-delivery surface carried at the distal end of the probe so that the expanded surface contacts a wall of a uterine cavity; and
delivering energy through the energy-delivery surface into the wall of the uterine cavity.
10. The method of claim 1 wherein the positioning step is preceded by a step of measuring the length of the uterine cavity.
11. The method of claim 1 wherein the positioning step is preceded by the step of measuring the length of the endocervical canal.
12. The method of claim 1 wherein the positioning step includes expanding a cross-section of the seal assembly within the endocervical canal.
13. The method of claim 1 wherein the positioning step is preceded by the step of setting a length dimension of the energy-delivery surface when expanded in the uterine cavity.