# US 2017/0281972 A1 · Multi-leaf collimator and driving system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0281972 A1 - Document ID: US20170281972A1 - Status: Published application - Kind: A1 - Application number: 15/313,960 - Filed: 2016-09-09 - Published: 2017-10-05 - Earliest claimed: 2015-09-10 - Assignees: Shanghai United Imaging Healthcare Co., Ltd. - Applicants: Shanghai United Imaging Healthcare Co., Ltd. - Inventors: Jian ZHANG; Xiaolong LIU; Xiao FANG; Hui ZHOU; Hui Yin; Xu CHAO; Jian LIU - Web page: https://patentgrep.com/patent/US20170281972A1 ## CPC - G21K 1/046: {varying the contour of the field, e.g. multileaf collimators} - A61B 6/06: Diaphragms - A61N 5/1045: {using a multi-leaf collimator, e.g. for intensity modulated radiation therapy or IMRT} - G21K 1/04: using variable diaphragms, shutters, choppers - G01N 2223/316: collimators - G21K 1/02: using diaphragms, collimators - H01J 2237/045: Diaphragms - H01J 2237/0455: with variable aperture - H01J 2237/0456: Supports - H01J 2237/0458: movable, i.e. for changing between differently sized apertures - G21K: HANDLING OF PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H) ## Abstract The present disclosure relates to a collimator. The collimator may include a motor, a transmission unit having a first end and a second end, and a leaf unit having a leaf. The first end of the transmission unit may be connected to the motor and the second end of the transmission unit may be connected to the leaf. The present disclosure also relates to a collimator system. The collimator system may include a leaf module having a leaf, a driving module having a motor configured to drive the leaf, and a processing module to generate a movement profile of the leaf. The movement profile of the leaf may include a first speed during a first stage, a second speed of the leaf during a second stage, and a third speed of the leaf during a third stage. ## Claims ### Claim 1 A collimator comprising: a motor; a transmission unit having a first end and a second end; and a leaf unit having a leaf; wherein the first end of the transmission unit is connected to the motor and the second end of the transmission unit is connected to the leaf. ### Claim 2 (depends on 1) The collimator of claim 1 further comprising a shell configured to contain the motor. ### Claim 3 (depends on 1) The collimator of claim 1, wherein the transmission unit includes a transmission shaft. ### Claim 4 (depends on 3) The collimator of claim 3 further comprising a connection unit configured to connect the transmission unit and the leaf, wherein the leaf has a groove, the connection unit has an expansion bump, and the expansion bump matches the groove. ### Claim 5 (depends on 1) The collimator of claim 1, wherein the transmission unit comprises a transmission line and an elastic piece, and the transmission line provides the leaf a first force, and the elastic piece provides the leaf a second force. ### Claim 6 (depends on 5) The collimator of claim 5, wherein the elastic piece is a spring having a third end and a fourth end, the third end of the spring is fixed, the fourth end of the spring is connected to the leaf, and the spring is in a compressed state. ### Claim 7 (depends on 1) The collimator of claim 1, wherein the leaf has a thickness in a range from 0.8 mm to 2.2 mm. ### Claim 8 (depends on 1) The collimator of claim 1 further comprising a conversion unit configured to change a rotational motion of the motor to a linear motion. ### Claim 9 (depends on 1) The collimator of claim 1, wherein the transmission unit is flexible. ### Claim 10 (depends on 8) The collimator of claim 8, wherein the conversion unit comprises a gear and a worm, the worm is connected to the motor, and the gear is driven by the worm. ### Claim 11 (depends on 10) The collimator of claim 10, wherein the gear and the worm have a self-locking function. ### Claim 12 (depends on 1) The collimator of claim 1 further comprising a guiding unit configured to control a movement path of the transmission unit. ### Claim 13 (depends on 1) The collimator of claim 1 further comprising a feedback module configured to detect a movement of the leaf. ### Claim 14 A collimator system comprising: a leaf module having a leaf; a driving module having a motor configured to drive the leaf; and a processing module to generate a movement profile of the motor; wherein the movement profile of the motor includes a first speed during a first stage, a second speed of the motor during a second stage, and a third speed of the motor during a third stage, the first speed increases with time, the second speed is constant, and the third speed decreases at a variable rate with time. ### Claim 15 (depends on 14) The collimator system of claim 14, wherein the variable rate is determined based on a distance between a leaf current location and a leaf target location. ### Claim 16 (depends on 14) The collimator system of claim 14 further comprising a feedback module configured to detect a movement of the leaf. ### Claim 17 (depends on 16) The collimator system of claim 16, wherein the feedback module comprises a first feedback unit and a second feedback unit, the first feedback unit is configured to detect the movement of the leaf, and the second feedback unit is configured to detect a movement of the motor. ### Claim 18 (depends on 17) The collimator system of claim 17, wherein the processing module detects a status of the leaf based on the movement of the leaf and the movement of the motor. ### Claim 19 (depends on 14) The collimator system of claim 14, wherein the leaf module comprises a transmission unit, and the transmission unit is connected to the motor and the leaf. ### Claim 20 (depends on 14) The collimator system of claim 14 further comprising a protection module configured to detect whether the motor is running normally.