CN210786018U

CN210786018U - Accelerator treatment bed

Info

Publication number: CN210786018U
Application number: CN201920848543.7U
Authority: CN
Inventors: 刘鑫
Original assignee: Chengdu Linike Medical Co ltd
Current assignee: Chengdu Linike Medical Co ltd
Priority date: 2019-06-06
Filing date: 2019-06-06
Publication date: 2020-06-19
Anticipated expiration: 2029-06-06

Abstract

The utility model discloses an accelerator treatment bed, which belongs to the field of medical instruments. The accelerator treatment bed comprises a base, a bed board connected with the base through a driving mechanism, a control module for driving the driving mechanism, a display device connected with the control module and a control unit connected with the control module, wherein the driving mechanism comprises a first sub-driving mechanism, a second sub-driving mechanism and a third sub-driving mechanism which are sequentially arranged from bottom to top; the base, the first sub-driving mechanism and the second sub-driving mechanism are all provided with a fixed grid of a capacitive grid sensor, the first sub-driving mechanism is provided with a movable grid matched with the fixed grid positioned on the base, the second sub-driving mechanism is provided with a movable grid matched with the fixed grid positioned on the first sub-driving mechanism, the third sub-driving mechanism is provided with a movable grid matched with the fixed grid positioned on the second sub-driving mechanism, and chips of the three capacitive grid sensors are all connected with the control unit.

Description

Accelerator treatment bed

Technical Field

The utility model relates to the field of medical equipment, concretely relates to accelerator treatment bed.

Background

The accelerator treatment bed is used for supporting a patient and consists of a base, a bed board connected with the base through a driving mechanism and a control unit of the driving mechanism. The patient lies on the bed board, and the bed board moves in the three-dimensional direction under the action of the control unit and the driving mechanism, so that the patient is driven to move, and conditions are provided for accurate radiotherapy of the specific part of the patient. The driving mechanism generally includes a lifting mechanism, a transverse moving mechanism and a longitudinal moving mechanism, and the lifting mechanism, the transverse moving mechanism and the longitudinal moving mechanism are all called sub-driving mechanisms.

The displacement measurement of the treatment couch due to the conventional accelerator generally uses a shaft encoder. The encoders are divided into incremental encoders and absolute value encoders, and convert linear displacement into a rotation angle of the encoders through a complex mechanical structure, and errors in the process include gear backlash errors and system errors, so that the positioning accuracy of the traditional accelerator treatment couch is low.

SUMMERY OF THE UTILITY MODEL

To the above insufficiency in the prior art, the utility model aims to provide an accelerator treatment bed which can reduce the positioning error.

In order to achieve the purpose of the invention, the utility model adopts the technical scheme that:

the accelerator treatment bed comprises a base, a bed board connected with the base through a driving mechanism, a control module for driving the driving mechanism, a display device connected with the control module and a control unit connected with the control module, wherein the driving mechanism comprises a first sub-driving mechanism, a second sub-driving mechanism and a third sub-driving mechanism which are sequentially arranged from bottom to top; the base, the first sub-driving mechanism and the second sub-driving mechanism are all provided with a fixed grid of a capacitive grid sensor, the first sub-driving mechanism is provided with a movable grid matched with the fixed grid positioned on the base, the second sub-driving mechanism is provided with a movable grid matched with the fixed grid positioned on the first sub-driving mechanism, the third sub-driving mechanism is provided with a movable grid matched with the fixed grid positioned on the second sub-driving mechanism, and chips of the three capacitive grid sensors are all connected with the control unit.

Further, the first sub-driving mechanism realizes lifting of the bed board, the second sub-driving mechanism realizes longitudinal movement of the bed board, and the third sub-driving mechanism realizes transverse movement of the bed board.

Furthermore, the control unit comprises three sub-control units respectively connected with the three chips, each sub-control unit comprises a single chip microcomputer U8, a trigger circuit and a level conversion circuit connected with the Data output end Data of the chip, the output end of the level conversion circuit is connected with the input end of a waveform shaping circuit, and the output end of the waveform shaping circuit is connected with the Data input ends DAS and DSB of the shift registers U2 in the three shift registers U2, U3 and U4 which are sequentially connected in series; the single chip microcomputer U8 is connected with three buffers U5, U6 and U7 through a line selection method, and the input end of each buffer is connected with the output end of one shift register one by one; the output end of the trigger circuit is connected with a P3.2 pin of a singlechip U8, a P3.2 pin and a P1.0 pin of a U8 of the singlechip are respectively connected with two input ends of a 2-input four-NOR gate U9, and the output end of the 2-input four-NOR gate U9 is connected with a CLR end of a shift register U2.

Furthermore, the level shift circuit comprises resistors R5 and R6 both connected with the Data output terminal Data, the resistors R5 and R6 are connected through a diode D1, a connection node between a cathode of the diode D1 and a resistor R5 is respectively connected with a base of the transistor Q1 and the resistor R3 connected with a high level, an emitter of the transistor Q1 and an anode of the diode D1 are both grounded, a collector of the transistor Q1 is connected with the resistor R4 connected with the high level, and a collector of the transistor Q1 is an output terminal of the level shift circuit.

Further, the waveform shaping circuit includes an inverter U2A whose input terminal is connected to the output terminal of the level shift circuit, the output terminal of the inverter U2A is connected to the input terminal of the inverter U2B, and the output terminal of the inverter U2B is the output terminal of the waveform shaping circuit.

The utility model has the advantages that:

the capacitive grating sensor which is composed of a fixed grating and a chip which are positioned on the base and a movable grating which is positioned on the first sub-driving mechanism is utilized to detect the unidirectional displacement of the first sub-driving mechanism relative to the base (namely the unidirectional displacement of the bed plate relative to the base); detecting the unidirectional displacement of the second sub-driving mechanism relative to the first sub-driving mechanism (namely the unidirectional displacement of the bed plate relative to the base) by utilizing the fixed grid and the chip which are positioned on the first sub-driving mechanism and the movable grid which is positioned on the second sub-driving mechanism; and detecting the unidirectional displacement of the third sub-driving mechanism relative to the second sub-driving mechanism (namely the unidirectional displacement of the bed plate relative to the base) by using the fixed grid and the chip on the second sub-driving mechanism and the movable grid on the third sub-driving mechanism. Thereby realize the direct detection of the three-dimensional displacement of bed board relative base to transmit the testing result to the control module of accelerator treatment bed as displacement feedback through the control unit, thereby be convenient for control module to continue to adjust control parameter.

The detection of three-dimensional relative displacement all adopts the mode of direct detection, need not convert linear displacement into rotation angle, and the influence of mechanical clearance such as no gear, the error is littleer, and the location is more accurate, and then realizes the accurate regulation of bed board.

Drawings

FIG. 1 is a schematic diagram of an accelerator treatment couch in an exemplary embodiment;

fig. 2 is a schematic circuit diagram of a chip of a capacitive sensor and a sub-control unit.

Wherein, 1, a base; 2. a first sub-drive mechanism; 3. a second sub-drive mechanism; 4. moving the grid; 5. a bed board; 6. a patient; 7. a third sub-drive mechanism; 8. fixing a grid; 9. a control unit; 11. a level conversion circuit; 12. a waveform shaping circuit; 13. a trigger circuit.

Detailed Description

The following detailed description of the present invention will be made with reference to the accompanying drawings so as to facilitate the understanding of the present invention by those skilled in the art. It should be understood that the embodiments described below are only some embodiments of the invention, and not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step, without departing from the spirit and scope of the present invention as defined and defined by the appended claims, belong to the protection scope of the present invention.

As shown in fig. 1, the accelerator treatment couch comprises a base 1, a bed plate 5 connected with the base 1 through a driving mechanism, a control module for driving the driving mechanism, a display device connected with the control module, and a control unit 9 connected with the control module, wherein the driving mechanism comprises a first sub-driving mechanism 2, a second sub-driving mechanism 3 and a third sub-driving mechanism 7 which are sequentially arranged from bottom to top; the base 1, the first sub-driving mechanism 2 and the second sub-driving mechanism 3 are all provided with a fixed grid 8 of a capacitive grid sensor, the first sub-driving mechanism 2 is provided with a movable grid 4 matched with the fixed grid 8 positioned on the base 1, the second sub-driving mechanism 3 is provided with a movable grid 4 matched with the fixed grid 8 positioned on the first sub-driving mechanism 2, the third sub-driving mechanism 7 is provided with a movable grid 4 matched with the fixed grid 8 positioned on the second sub-driving mechanism 3, and chips of the three capacitive grid sensors are all connected with the control unit 9.

In this embodiment, as shown in fig. 1, it is preferable that the first sub-driving mechanism 2 lifts the top board 5, the second sub-driving mechanism 3 moves the top board 5 in the longitudinal direction, and the third sub-driving mechanism 7 moves the top board 5 in the lateral direction. And the chips of the three capacitive gate sensors are all positioned on the platform where the fixed gate 8 of the capacitive gate sensor belongs to.

The following description will be made by taking the detection of the displacement of the first sub-drive mechanism 2 in the ascending/descending direction with respect to the base 1 as an example: the movement of the first sub-driving mechanism 2 drives the movable grid 4 on the first sub-driving mechanism and the fixed grid 8 on the base 1 to make a relative movement parallel to the moving direction of the first sub-driving mechanism 2. Then the control unit 9 collects the data of the capacitive grating sensor chip and converts the data into digital quantity change, thereby realizing the direct detection of the displacement of the first sub-driving mechanism 2 relative to the lifting direction of the base 1.

Similarly, the fixed grid 8 and the chip on the first sub-driving mechanism 2 and the movable grid 4 on the second sub-driving mechanism 2 are utilized to realize the direct detection of the longitudinal displacement of the bed plate 5; the direct detection of the transverse displacement of the bed plate 5 is realized by utilizing the fixed grid 8 and the chip which are positioned on the second sub-driving mechanism 2 and the movable grid 4 which is positioned on the third sub-driving mechanism 7.

Wherein the control unit 9 comprises three sub-control units connected to the three chips, respectively. As shown in fig. 2, the sub-control unit includes a single chip microcomputer U8, a trigger circuit 13 and a level shift circuit 11 connected with a Data output end Data of the chip, an output end of the level shift circuit 11 is connected with an input end of a waveform shaping circuit 12, and an output end of the waveform shaping circuit 12 is connected with Data input ends DAS and DSB of a shift register U2 of three shift registers U2, U3 and U4 which are connected in series in sequence; the single chip microcomputer U8 is connected with three buffers U5, U6 and U7 through a line selection method, and the input end of each buffer is connected with the output end of one shift register one by one; the output end of the trigger circuit 13 is connected with a pin P3.2 of the singlechip U8, a pin P3.2 and a pin P1.0 of the singlechip U8 are respectively connected with two input ends of a 2-input four-NOR gate U9, and the output end of the 2-input four-NOR gate U9 is connected with a CLR end of the shift register U2.

The level conversion circuit 11 includes resistors R5 and R6 both connected to the Data output terminal Data, the resistors R5 and R6 are connected through a diode D1, a connection node between a cathode of the diode D1 and a resistor R5 is respectively connected to a base of the transistor Q1 and the resistor R3 connected to a high level, an emitter of the transistor Q1 and an anode of the diode D1 are both grounded, a collector of the transistor Q1 is connected to the resistor R4 connected to the high level, and a collector of the transistor Q1 is an output terminal of the level conversion circuit 11. The resistor R5 is a current-limiting resistor, the resistor R6 is a shunt resistor, the resistors R3 and R4 protect the base and collector of the triode Q1, and the diode D1 prevents the emitter of the triode Q1 from being broken down when reverse high voltage is generated.

The waveform shaping circuit 12 includes an inverter U2A having an input terminal connected to the output terminal of the level shifter circuit 11, an output terminal of the inverter U2A is connected to the input terminal of the inverter U2B, and an output terminal of the inverter U2B is the output terminal of the waveform shaping circuit 12.

The chip inputs the collected signal to the level conversion circuit 11 and converts the signal into Data1 through the waveform shaping circuit 12. The flip-flop circuit 13 generates an ST signal, and inputs the ST signal and Data1 to the shift register U2. And the ST signal and a pin P1.0 of the singlechip U8 jointly control a CLR end (namely a reset input end) of the shift register U2, only when the input at two ends is low simultaneously, the input at the CLR end of the shift register U2 is high, otherwise, the outputs of the shift registers U2, U3 and U4 are all low. The P1.1, P1.2 and P1.3 pins of the singlechip U8 control the buffers U5, U6 and U7, and the 24-bit data are divided into three groups and sent to the singlechip U8. And the ST signal is connected with a P3.2 pin of the singlechip U8, when the P3.2 pin of the singlechip U8 receives an interrupt signal, data conversion is carried out, and the converted data are transmitted to a control module of the accelerator treatment bed for displacement feedback and display data of a display device.

Claims

1. The accelerator treatment bed is characterized by comprising a base (1), a bed board (5) connected with the base (1) through a driving mechanism, a control module for driving the driving mechanism, a display device connected with the control module and a control unit (9) connected with the control module, wherein the driving mechanism comprises a first sub-driving mechanism (2), a second sub-driving mechanism (3) and a third sub-driving mechanism (7) which are sequentially arranged from bottom to top; the device is characterized in that a fixed grid (8) of a capacitive grid sensor is arranged on the base (1), the first sub-driving mechanism (2) and the second sub-driving mechanism (3), a fixed grid (8) matched with a movable grid (4) on the base (1) is arranged on the first sub-driving mechanism (2), a fixed grid (8) matched with a movable grid (4) on the first sub-driving mechanism (2) is arranged on the second sub-driving mechanism (3), a fixed grid (8) matched with a movable grid (4) on the second sub-driving mechanism (3) is arranged on the third sub-driving mechanism (7), and the chip of the capacitive grid sensor is connected with the control unit (9).

2. Accelerator treatment couch according to claim 1, characterized in that the first sub-drive mechanism (2) effects elevation of the couch plate (5), the second sub-drive mechanism (3) effects longitudinal movement of the couch plate (5), and the third sub-drive mechanism (7) effects lateral movement of the couch plate (5).

3. Accelerator treatment couch according to claim 1 or 2, characterized in that the control unit (9) comprises three sub-control units connected to three of the chips, respectively, the sub-control units comprising a single-chip microcomputer U8, a flip-flop circuit (13) and a level shifter circuit (11) connected to the Data output Data of a chip, the output of the level shifter circuit (11) being connected to the input of a waveform shaping circuit (12), the output of the waveform shaping circuit (12) being connected to the Data inputs DAS and DSB of the shift registers U2 of the three shift registers U2, U3 and U4 connected in series in sequence; the single chip microcomputer U8 is connected with three buffers U5, U6 and U7 through a line selection method, and the input end of each buffer is connected with the output end of one shift register one by one; the output end of the trigger circuit (13) is connected with a P3.2 pin of a single chip microcomputer U8, a P3.2 pin and a P1.0 pin of a U8 of the single chip microcomputer are respectively connected with two input ends of a 2-input four-NOR gate U9, and the output end of the 2-input four-NOR gate U9 is connected with a CLR end of a shift register U2.

4. Accelerator treatment couch according to claim 3, characterized in that the level shift circuit (11) comprises resistors R5 and R6 both connected to the Data output Data, the resistors R5 and R6 are connected through a diode D1, a connection node between a cathode of the diode D1 and a resistor R5 is connected to a base of a transistor Q1 and a resistor R3 connected to a high level, an emitter of the transistor Q1 and an anode of the diode D1 are both grounded, a collector of the transistor Q1 is connected to the resistor R4 connected to the high level, and a collector of the transistor Q1 is an output terminal of the level shift circuit (11).

5. Accelerator treatment couch according to claim 3, characterized in that the waveform shaping circuit (12) comprises an inverter U2A having an input connected to the output of the level shifter circuit (11), the output of the inverter U2A being connected to the input of the inverter U2B, the output of the inverter U2B being the output of the waveform shaping circuit (12).