System and method for intravascular ionizing tandem radiation therapy
First Claim
Patent Images
1. A medical system for intravascular ionizing radiation therapy, comprising:
- an elongate radiation device having a radiopaque marker and a radioactive source disposed adjacent a distal end thereof, the radioactive source having a length and a dose distribution, the dose distribution having a nominal dose, a proximal dose fall-off, a distal dose fall-off, a proximal point in the proximal dose fall-off corresponding to 50% of the nominal dose, a distal point in the distal dose fall-off corresponding to 50% of the nominal dose, wherein the proximal 50% point is separated from the distal 50% point by a distance L; and
an elongate guide wire having a plurality of radiopaque markers disposed adjacent a distal region thereof, the radiopaque markers separated by the distance L such that dose fall-off overlap is created when the radioactive source is positioned adjacent each radiopaque marker.
3 Assignments
0 Petitions
Accused Products
Abstract
A system for intravascular ionizing radiation therapy including a radiation device and a guide wire having radiopaque markers to facilitate precise repositioning of the radiation source along the length of the treatment site. The radiopaque markers are separated by a distance L, which corresponds to the distance between the 50% dose points in the dose fall-off regions. This produces partial dose overlap when the radioactive source is positioned in tandem adjacent each radiopaque marker. Preferably, only the dose fall-off regions overlap thereby providing more uniform and complete radiation exposure along the length of the treatment site.
-
Citations
17 Claims
-
1. A medical system for intravascular ionizing radiation therapy, comprising:
-
an elongate radiation device having a radiopaque marker and a radioactive source disposed adjacent a distal end thereof, the radioactive source having a length and a dose distribution, the dose distribution having a nominal dose, a proximal dose fall-off, a distal dose fall-off, a proximal point in the proximal dose fall-off corresponding to 50% of the nominal dose, a distal point in the distal dose fall-off corresponding to 50% of the nominal dose, wherein the proximal 50% point is separated from the distal 50% point by a distance L; and
an elongate guide wire having a plurality of radiopaque markers disposed adjacent a distal region thereof, the radiopaque markers separated by the distance L such that dose fall-off overlap is created when the radioactive source is positioned adjacent each radiopaque marker. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A guide wire for use in combination with an elongate radiation device for intravascular ionizing radiation therapy, wherein the elongate radiation device includes a radioactive source disposed adjacent a distal end thereof, the radioactive source having a length and a dose distribution, the dose distribution having a nominal dose, a proximal dose fall-off, a distal dose fall-off, a proximal point in the proximal dose fall-off corresponding to 50% of the nominal dose, a distal point in the distal dose fall-off corresponding to 50% of the nominal dose, wherein the proximal 50% point is separated from the distal 50% point by a distance L, the guide wire comprising:
-
an elongate shaft having a distal region; and
two or more radiopaque markers disposed adjacent the distal region of the shaft, the radiopaque markers separated by the distance L such that dose fall-off overlap is created when the radioactive source is positioned adjacent each radiopaque marker. - View Dependent Claims (14)
-
-
15. A method of administering ionizing radiation at a treatment site within a patient'"'"'s vasculature, comprising the steps of:
-
providing an elongate radiation device having a radiopaque marker and a radioactive source disposed adjacent a distal end thereof, the radioactive source having a length and a dose distribution, the dose distribution having a nominal dose, a proximal dose fall-off, a distal dose fall-off, a proximal point in the proximal dose fall-off corresponding to 50% of the nominal dose, a distal point in the distal dose fall-off corresponding to 50% of the nominal dose, wherein the proximal 50% point is separated from the distal 50% point by a distance L;
providing an elongate guide wire having a proximal and a distal radiopaque marker disposed adjacent a distal region thereof, the radiopaque markers separated by the distance L;
inserting the guide wire into the vasculature of the patient;
advancing the guide wire through the vasculature until the radiopaque markers are disposed adjacent the treatment site;
inserting the radiation device into the vasculature of the patient;
positioning the radioactive source adjacent one of the radiopaque markers; and
repositioning the radioactive source adjacent the other of the radiopaque markers such that dose fall-off overlap is created. - View Dependent Claims (16, 17)
-
Specification