Source driving device for intracavitary tumour after-mounted radiotherapy machine

Abstract

The present invention relates to a source driving device for intracavitary tumor post-installation radiation therapy machine. Compared with the existing source driving device, the device is improved in that: a steel wire flexible shaft is used instead of a steel wire rope as the source braid control cable, and the helix of the source braid control cable The helix angle γ and the pitch P1 of the shaped steel wire are equal to the helix angle β and the tooth pitch P2 of the helical gear respectively, which are 12°~14° and 2~3mm. The helical gear is used to replace the source driving wheel, and the driving mechanism is changed from friction transmission to meshing transmission between the source braid control cable and the helical gear. The source drive reliability of the treatment machine is increased from the original 95% to over 99.5%, the step treatment accuracy is increased from the original ±1mm to ±0.5mm, and the manufacturing cost is reduced by 25%.

Description

technical field [0001] The invention belongs to radiation medical equipment, in particular to a source driving device for an intracavity tumor post-installation radiation therapy machine. Background technique [0002] In the prior art, the structural principle of the source driving device of the intracavitary tumor post-loading radiotherapy machine is as follows: one end of the source braided control cable (that is, a steel wire rope) is pressed against the source driving wheel with a pressure plate, and then the source braided control cable Sequentially wound in the spiral groove of the source driving wheel, and then tensioned with a tension belt, and the other end is connected with the radioactive source braid (that is, the fixing device of the radioactive source); when the source driving wheel rotates counterclockwise and closes the tension belt and the source The friction of the driving wheel drives the source braid control cable to move, thereby driving the radioactive ...

AI Technical Summary

Problems solved by technology

The deficiency of this technology is; 1, after the device is used for a certain period of time, the tension belt is elongated and cracked due to deformation; 2, when returning to the source after irradiation, the source braided control cable sometimes cannot enter the spiral groove of the source drive wheel in sequence ( That is, the chaotic groove problem of the source braid control cable), which will greatly reduce the positioning accuracy of the device when it is used next time, and there may be a treatment accident; 3. When the source braid control cable is subjected to greater resistance than the tension belt and source drive In the case of the friction force of the wheel, the source braided control cable is prone to slipping on the source drive wheel, and the radioactive source cannot be sent to the predetermined position; 4. It is impossible to make the post-installed radiotherapy machine for tumors in the cavity have the function of automatically returning to the source when it is blocked; 5. Complex structure, high manufacturing cost, troublesome assembly, debugging and maintenance

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