Brachytherapy Device Having an Alignment and Seal Adaptor

Abstract

A brachytherapy device for treating tissue within a cavity of a body. The device may include a first set of tubes configured to be inserted into the cavity through an opening at the surface of the body. Each of the tubes may have an external end and an interior channel beginning at the external end that is configured to receive radioactive material. The external ends of the tubes may be bundled together. The tubes may be of a length that causes the external ends to be near the opening in the surface of the body while the tubes are in the cavity. A seal may be configured to prevent fluid that originates from the cavity from entering into the external ends of the tubes while they are near the opening in the surface of the body. The seal may include a gasket that is pressed against the external ends of the tubes. The gasket may have openings that align with channels within the external ends of the tubes.

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 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 tubes being bundled together, the tubes being of a length that causes the external ends to be near the opening in the surface of the body while the tubes are in the cavity; and   a seal configured to prevent fluid that originates from the cavity from entering into the external ends of the tubes while they are near the opening in the surface of the body.   
   
   
       2 . The brachytherapy device of  claim 1  wherein the external ends of the 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 tubes. 
   
   
       3 . The brachytherapy device of  claim 2  wherein the gasket includes a plurality of openings, each of which is aligned with one of the channels in the tubes so as to allow radioactive material to be inserted into the channel of the tube while preventing fluid that originates from the cavity from entering into the external end of the tube. 
   
   
       4 . The brachytherapy device of  claim 3  wherein the external end of each tube 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. 
   
   
       5 . The brachytherapy device of  claim 4  further comprising an alignment mechanism configured to cause each opening in the gasket that is pressed against one of the external ends of the tubes to align with the channel in the external end of the tube. 
   
   
       6 . The brachytherapy device of  claim 3  further comprising a cover configured to cover the openings in the gasket. 
   
   
       7 . The brachytherapy device of  claim 6  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. 
   
   
       8 . The brachytherapy device of  claim 7  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. 
   
   
       9 . The brachytherapy device of  claim 8  wherein the openings in the cover do not align with the openings in the gasket when the cover is in the closed position. 
   
   
       10 . The brachytherapy device of  claim 8  wherein the cover includes an alignment mechanism that is configured to facilitate alignment of the cover with an afterloader. 
   
   
       11 . The brachytherapy device of  claim 10  wherein the alignment mechanism includes a plurality of indentations within a surface of the cover. 
   
   
       12 . The brachytherapy device of  claim 7  wherein the cover is configured to rotate about an axis while moving between the open and closed positions. 
   
   
       13 . The brachytherapy device of  claim 2  further comprising a fastener configured to fasten the gasket to the tubes. 
   
   
       14 . The brachytherapy device of  claim 13  further comprising a hollow tube surrounded by the ends 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. 
   
   
       15 . The brachytherapy device of  claim 2  further comprising a sleeve around the external ends of the tubes. 
   
   
       16 . 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. 
   
   
       17 . The brachytherapy device of  claim 16  wherein at least some of the second set of tubes have an interior channel beginning at the external end of the 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. 
   
   
       18 . The brachytherapy device of  claim 17  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 sets of tubes and through the corresponding channel in one of the second sets of tubes. 
   
   
       19 . The brachytherapy device of  claim 18  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 sets of tubes and through the corresponding channel in one of the second sets of tubes. 
   
   
       20 . The brachytherapy device of  claim 16  wherein the second set of tubes surround the first set of tubes. 
   
   
       21 . A seal for a brachytherapy device that has tubes configured to be inserted into a cavity through an opening at a surface of a body, each of the 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 tubes being bundled together and lying in substantially the same plane, the tubes being of a length that causes the external ends to be near the opening in the surface of the body when the tubes are in the cavity, the seal comprising:
 a substantially flat gasket that is configured to be pressed against the external ends of the tubes, the gasket having a plurality of openings oriented so as to be aligned with the channels in the tubes when pressed against the external ends of the tubes so as to allow radioactive material to be inserted into the channels of the tubes while preventing fluid that originates from the cavity from entering into the external ends of the tubes.   
   
   
       22 . 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;   rotating a 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.