Source driving device for intracavitary tumour after-mounted radiotherapy machine

[0010] The present invention will now be described in detail with reference to the drawings and embodiments:

[0011] Such as figure 1 , figure 2 As shown, the source braid control cable 1 of the source drive device of the present invention is made of a steel wire rope as the core shaft, and then a layer of spiral steel wire is tightly wound on the steel wire rope. The helix angle γ is 13.15°, and the pitch P1 is 2.5mm. One end of the source braid control cable 1 is connected with the radiation source braid, and the other end is meshed with the helical gear 10. The helix angle β of the helical gear is 13.15°, the tooth pitch P2 is 2.5mm, and a ring-shaped arc groove 19 with a radius of 1.8mm is opened on the symmetrical medium surface of the tooth width direction of the helical gear 10, the arc groove The string movement of the source braid control cable 1 in the tooth width direction of the helical gear 10 can be restricted. The helical gear 10, the housing 8, the bearing 11, and the pan head screw 3 together form a drive gear box. The housing 8 is divided into upper and lower parts, which are respectively connected to the helical gear 10 through two bearings 11 on the side of the helical gear 10, and four more The pan-head screws 3 are connected and fixed into one body. The helical gear 10 is connected to the shaft 5 through a flat key 14, and the shaft 5 is fixed on the shaft of the motor 13 with a set screw 15. A pinion gear 4 is fixed at the top of the shaft 5 with a lock nut 6, and the pinion gear 4 transmits the rotation angle of the helical gear 10 to the detection device to determine the position of the source. The motor 13 is fixed on the mounting base plate 9 with four bolts 12, and the drive gear box is fixed on the mounting base plate 9 with four pan-head screws 7. Six circular photoelectric detection device interfaces 18 are evenly arranged on the helical gear, and the same photoelectric detection device interface 18 is provided at the corresponding positions of the upper and lower parts of the housing. The center of these two interfaces is to the helical gear. The vertical distance of the axle 10 is equal to the vertical distance from the center of the six interfaces on the helical gear 10 to the axle of the helical gear 10. Such as figure 2 As shown, there are a total of two quick-connect switching heads 2 in the source driving device, which are connected to the control conduit 16 and the auxiliary storage conduit 17, respectively. One end of the source braid control cable 1 penetrates the control conduit 16 and one quick-connect switching head 2. Insert the drive gear box to make the source braid control cable 1 mesh with the helical gear 10, and rotate the shaft 5 so that the source braid control cable 1 can mesh with the teeth on the half circumference of the helical gear 10, and pass through another quick-connect switch 2 Drive the gear box and enter the auxiliary storage duct 17.

[0012] After the device is installed on the intracavitary tumor post-installation radiotherapy machine through the installation base plate 9, the other end of the source braid control cable 1 is connected to the radiation source braid. When in use, the motor 13 makes the helical gear 10 rotate counterclockwise and drives the source braid control cable 1 meshed with it to move forward, thereby driving the radiation source braid to move so that the radiation source can be sent to a predetermined position for irradiation; The motor 13 makes the helical gear 10 rotate clockwise and drives the source braid control cable 1 engaged with it to move backwards, thereby driving the radioactive source braid to move so that the radioactive source can be retracted into the shield, and the source braid control cable 1 is retracted to the auxiliary storage catheter Within 17.