Brachytherapy device having an alignment and seal adaptor

1. A brachytherapy device for treating tissue within a cavity of a body comprising:

a first set of tubes configured to be inserted into the cavity through an opening at the surface of the body, each of the first set of tubes having an external end and an interior channel beginning at the external end that is configured to receive radioactive material, the external ends of the first set of tubes being bundled together and lying in substantially the same plane and protruding from the opening in the surface of the body while the first set of tubes are in the cavity;

a seal configured to prevent fluid that originates from the cavity from entering into the external ends of the first set of tubes while they protrude from the opening in the surface of the body, the seal comprising a substantially flat gasket that is pressed against the external ends of the first set of tubes, and the gasket comprising a plurality of openings, each of which is aligned with one of the channels in the first set of tubes so as to allow radioactive material to be inserted into the channels of the first set of tubes while preventing fluid that originates from the cavity from entering into the external ends of the first set of tubes;

a fastener configured to fasten the gasket to the tubes; and

a hollow tube surrounded by the ends of the first set of tubes and running substantially parallel to the full length of the first set of tubes,

wherein the gasket includes a central opening and the fastener includes a screw having a shaft that passes through the central opening in the gasket and into the hollow tube.

2. The brachytherapy device of claim 1 wherein the external end of each of the first set of tubes has a cross-section having an outer perimeter and wherein the opening in the gasket that is pressed against each external end does not at any point extend beyond the outer perimeter of the external end of the tube.

3. The brachytherapy device of claim 2 further comprising an alignment mechanism configured to cause each opening in the gasket that is pressed against one of the external ends of the first set of tubes to align with the channel in the external end of the tube.

4. The brachytherapy device of claim 1 further comprising a cover configured to cover the openings in the gasket.

5. The brachytherapy device of claim 4 wherein the cover is configured to move from a closed position that covers the openings in the gasket to an open position that exposes the openings in the gasket.

6. The brachytherapy device of claim 5 wherein the cover includes openings through which radioactive material may be inserted that align with openings in the gasket when the cover is in the open position.

7. The brachytherapy device of claim 6 wherein the openings in the cover do not align with the openings in the gasket when the cover is in the closed position.

8. The brachytherapy device of claim 6 wherein the cover includes an alignment mechanism that is configured to facilitate alignment of the cover with an afterloader.

9. The brachytherapy device of claim 8 wherein the alignment mechanism includes a plurality of indentations within a surface of the cover.

10. The brachytherapy device of claim 5 wherein the cover is configured to rotate about an axis while moving between the open and closed positions.

11. The brachytherapy device of claim 1 further comprising a sleeve around the external ends of the first set of tubes.

12. The brachytherapy device of claim 1 further comprising a second set of tubes configured to be inserted into the cavity through the opening at the surface of the body along with the first set of tubes, each of the second set of tubes having an external end configured to be near the opening in the surface of the body while the first and second sets of tubes are inserted into the cavity, the external ends of the second set of tubes being bundled together with the external ends of the first set of tubes, wherein the external ends of the first and second sets of tubes lie in substantially the same plane and wherein the seal includes a substantially flat gasket that is pressed against the external ends of the first and second sets of tubes.

13. The brachytherapy device of claim 12 wherein at least some of the second set of tubes have an interior channel beginning at the external end of the corresponding tube, and wherein the gasket has a plurality of openings, some of which are aligned with channels in the first set of tubes and some of which are aligned with channels in the second set of tubes.

14. The brachytherapy device of claim 13 further including an alignment mechanism configured to align some of the openings in the gasket with the channels in the first set of tubes, the alignment mechanism including at least one pin configured to pass through one of the openings in the gasket that aligns with a channel in one of the second set of tubes and through the corresponding channel in one of the second set of tubes.

15. The brachytherapy device of claim 14 wherein the alignment mechanism includes a plurality of pins, each configured to pass through one of the openings in the gasket that aligns with a channel in one of the second set of tubes and through the corresponding channel in one of the second set of tubes.

16. The brachytherapy device of claim 12 wherein the second set of tubes surround the first set of tubes.

17. A brachytherapy process for treating tissue within a cavity of a body comprising in the order recited:

inserting a hollow set of tubes into the cavity through an opening at the surface of the body so as to leave the ends of the tubes protruding from the surface of the body, each of the tubes having an interior channel beginning at the end that is configured to receive radioactive material;

attaching a seal to the ends of the tubes for preventing fluid from entering into the ends of the tubes, the seal comprising a gasket and a cover, and the gasket comprising a plurality of openings each of which is aligned with one of the channels in the tubes;

rotating the cover from a closed position that covers entryways to the tubes to an open position that opens the entryway to the tubes;

inserting radioactive material into at least one of the tubes while the cover is in the open position;

removing the radioactive material from the tubes; and

rotating the cover to the closed position.