A dual hydraulic control system for MR examination

Abstract

The present invention discloses a dual hydraulic control system for MR examination, which relates to auxiliary equipment for MR examination. This solution is proposed in view of the problems that ceramic ultrasonic motors in the prior art are expensive and have low power. It includes a main hydraulic cylinder and a driving motor arranged in the equipment room, and a slave hydraulic cylinder arranged in the electromagnetic shielding layer of the magnet room; a slave piston in the slave hydraulic cylinder is connected to the syringe piston of the high-pressure injector through a push rod; a main piston in the main hydraulic cylinder is fixedly connected to the power output rod of the driving motor through a push rod; the electric control end of the driving motor is externally connected to the control signal of the MR control device; the corresponding first pipeline connection ports of the main hydraulic cylinder and the slave hydraulic cylinder are communicated through a first oil pipe, and the corresponding second pipeline connection ports are communicated through a second oil pipe. The advantages are that the setting of ceramic ultrasonic motors is completely avoided, and the power output of the high-pressure injector can be realized with low cost, high power and high precision.

Description

Technical Field

[0001] The present invention relates to an auxiliary device for MR examination, and particularly to a dual hydraulic control system for MR examination. Background Art

[0002] Magnetic Resonance (MR) examination is a method of examination in imaging.

[0003] The MR examination room mainly includes three functional rooms: a control room 10, an equipment room 20, and a magnet room 30, as Figure 1 shown.

[0004] The control room 10 is a space where medical staff can be located during the scanning examination. It is equipped with a man-machine interaction console 11 for inputting control instructions and visually understanding the working conditions of the magnet room 30.

[0005] The equipment room 20 is a space where medical staff will not enter during the scanning examination and is a space where maintenance personnel enter to work during non-scanning periods. It is equipped with an MR control device 21. The MR control device 21 is communicatively connected to the man-machine interaction console 11 and is communicatively connected to each device in the magnet room 30.

[0006] The magnet room 30 is another space where medical staff can be located during the scanning examination. It is equipped with at least a high-pressure injector 33 and an MR scanning device 32. The MR scanning device 32 is a device for scanning patients and is communicatively connected to the MR control device 21 through a specific electromagnetic isolation signal line. The high-pressure injector 33 is used to inject a contrast agent for MR examination into patients. Since the MR scanning device 32 is a special strong magnetic device, the magnet room 30 needs to be electromagnetically isolated from the outside through a fully enclosed electromagnetic shielding layer 31, and no magnetic materials, including magnetizable materials such as iron metal, are allowed inside the electromagnetic shielding layer 31.

[0007] Based on the strict restrictions on magnetism inside the electromagnetic shielding layer 31, there are very strict requirements for the power output of the high-pressure injector 33, which require both high precision and high driving power. The prior art is to drive the high-pressure injector 33 by setting a non-magnetic power device 34, and the specific choice of the non-magnetic power device 34 is only a ceramic ultrasonic motor. The cost of the ceramic ultrasonic motor is extremely high, and its output power does not exceed 10W, and the maximum torque is 1N·m. The non-magnetic power device 34 is an electrical product and necessarily needs to be connected to the MR control device 21 through an electromagnetic isolation signal line, and the electromagnetic isolation signal line is also an important factor in cost generation. Summary of the Invention

[0008] The purpose of the present invention is to provide a dual hydraulic control system for MR examination to solve the problems existing in the above prior art.

[0009] A dual hydraulic control system for MR examination according to the present invention includes a main hydraulic cylinder and a driving motor disposed in an equipment room, and a slave hydraulic cylinder disposed in an electromagnetic shielding layer of a magnet room;

[0010] A slave piston in the slave hydraulic cylinder is connected to a syringe piston of a high-pressure injector through a push rod; a main piston in the main hydraulic cylinder is fixedly connected to a power output rod of the driving motor through a push rod; an electric control end of the driving motor is externally connected to a control signal of an MR control device;

[0011] A first pipeline connection port corresponding to the main hydraulic cylinder and the slave hydraulic cylinder is communicated through a first oil pipe, and a second pipeline connection port corresponding to each other is communicated through a second oil pipe.

[0012] The push rod of the main piston is fixedly connected to the power output rod of the driving motor through a connecting mechanism.

[0013] Two opposite ends of the connecting mechanism are respectively fixedly clamped to the push rod of the main piston and the power output rod of the driving motor.

[0014] The first oil pipe and the second oil pipe are respectively provided with liquid supplement pipes with one-way valves.

[0015] A sensor for feedback of the movement of the main piston is further provided, and the sensor is electrically connected to the MR control device.

[0016] The dual hydraulic control system for MR examination according to the present invention has the advantages that the setting of a ceramic ultrasonic motor is completely avoided, and the power output of the high-pressure injector can be realized with low cost, high power and high precision. Description of the Drawings

[0017] Figure 1 is a schematic diagram of the distribution of functional rooms in an MR examination room in the prior art;

[0018] Figure 2 is a schematic diagram of the setting of the dual hydraulic control system according to the present invention in an MR examination room;

[0019] Figure 3 is a schematic diagram of the structure of the dual hydraulic control system according to the present invention;

[0020] Figure 4 is a schematic diagram of the state change of the dual hydraulic control system according to the present invention;

[0021] Figure 5 is a schematic diagram of the structure of the connecting mechanism according to the present invention.

[0022] Reference Signs:

[0023] 10 - control room, 11 - man-machine interaction console;

[0024] 20 - Equipment room, 21 - MR control device;

[0025] 30 - Magnet room, 31 - Electromagnetic shielding layer, 32 - MR scanning device, 33 - High - pressure syringe, 34 - Non - magnetic power device;

[0026] 40 - Dual hydraulic control system, 41 - Main hydraulic cylinder, 42 - Main piston, 43 - Connecting mechanism, 44 - Driving motor, 45 - First oil pipe, 46 - Second oil pipe, 47 - Slave hydraulic cylinder, 48 - Slave piston, 49 - Liquid supplement pipe. Detailed implementation mode

[0027] As Figure 2-5 shown, a dual hydraulic control system for MR examination according to the present invention includes a main hydraulic cylinder 41 and a driving motor 44 disposed in the equipment room 20, and a slave hydraulic cylinder 47 disposed in the electromagnetic shielding layer 31 of the magnet room 30.

[0028] The slave piston 48 in the slave hydraulic cylinder 47 is connected to the syringe piston of the high - pressure syringe 33 through a push - pull rod. The main piston 42 in the main hydraulic cylinder 41 is fixedly connected to the power output rod of the driving motor 44 through a push - pull rod. The electric control end of the driving motor 44 is externally connected to the control signal of the MR control device 21.

[0029] The first pipeline connection ports of the main hydraulic cylinder 41 and the slave hydraulic cylinder 47 corresponding to each other are communicated through the first oil pipe 45, and the second pipeline connection ports corresponding to each other are communicated through the second oil pipe 46. The first oil pipe 45 and the second oil pipe 46 are respectively provided with a liquid supplement pipe 49 with a one - way valve.

[0030] The push - pull rod of the main piston 42 is fixedly connected to the power output rod of the driving motor 44 through a connecting mechanism 43. The two opposite ends of the connecting mechanism 43 are respectively fixedly clamped to the push - pull rod of the main piston 42 and the power output rod of the driving motor 44.

[0031] A sensor for feedback on the movement of the main piston 42 is also provided, and the sensor is electrically connected to the MR control device 21. The sensor can be an angular velocity sensor fixed on the push - pull rod of the main piston 42.

[0032] Since the drive motor 44 is arranged in the equipment room 20 without electromagnetic restrictions, various high-power, high-precision, and low-cost drive motors in the prior art can be selected, such as servo motors. This directly bypasses the type restrictions of the ceramic ultrasonic motor. Compared with the original ceramic ultrasonic motor arrangement, it can also improve the accuracy of control and feedback. Because during the process of developer injection, the actual travel and rate of the syringe piston do not necessarily match the theoretical control. Inside the electromagnetic shielding layer 31, due to strict electromagnetic restrictions, it is impossible to configure a sensor to feedback the situation of the syringe piston. If the piston movement does not match the theoretical control, it cannot be fed back to the MR control device 21, and naturally it cannot be known in the man-machine interaction console 11 either. However, in the present invention, the travel directions of the slave piston 48 and the main piston 42 are opposite, and the absolute values of the travel and speed are exactly equal. The movement data of the main piston 42 can be accurately obtained through a sensor in the equipment room 20 without electromagnetic restrictions, so as to completely and dually obtain the movement situation of the slave piston 48, and a control-feedback loop between the magnet room 30 and the equipment room 20 is realized.

[0033] The working principle is as follows:

[0034] After receiving the control signal of the pull rod, the drive motor 44 outputs power to pull the main piston 42 out of the main hydraulic cylinder 41. The hydraulic oil in the main hydraulic cylinder 41 enters the second pipeline connection port of the slave hydraulic cylinder 47 through its second pipeline connection port and the second oil pipe 46. Correspondingly, the hydraulic oil in the slave hydraulic cylinder 47 enters the first pipeline connection port of the main hydraulic cylinder 41 through its first pipeline connection port and the second oil pipe 46. At this time, the slave piston 48 and its push rod move in the direction into the slave hydraulic cylinder 47, driving the syringe piston of the high-pressure syringe 33 to perform the step of contrast agent extraction.

[0035] After receiving the control signal of the push rod, the drive motor 44 outputs power to push the main piston 42 into the main hydraulic cylinder 41. The hydraulic oil in the main hydraulic cylinder 41 enters the first pipeline connection port of the slave hydraulic cylinder 47 through its first pipeline connection port and the first oil pipe 45. Correspondingly, the hydraulic oil in the slave hydraulic cylinder 47 enters the second pipeline connection port of the main hydraulic cylinder 41 through its second pipeline connection port and the second oil pipe 46. At this time, the slave piston 48 and its push rod move in the direction out of the slave hydraulic cylinder 47, driving the syringe piston of the high-pressure syringe 33 to perform the step of contrast agent injection.

[0036] For those skilled in the art, according to the technical solutions and concepts described above, various corresponding changes and deformations can be made, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A dual hydraulic control system for MR examination, characterized in that, It includes a main hydraulic cylinder (41) and a driving motor (44) disposed in the equipment room (20), and a slave hydraulic cylinder (47) disposed in the electromagnetic shielding layer (31) of the magnet room (30); The slave piston (48) in the slave hydraulic cylinder (47) is connected to the syringe piston of the high-pressure injector (33) through a push-pull rod; the main piston (42) in the main hydraulic cylinder (41) is fixedly connected to the power output rod of the driving motor (44) through a push-pull rod; the electric control end of the driving motor (44) is externally connected to the control signal of the MR control device (21); The first pipeline connection ports corresponding to each other of the main hydraulic cylinder (41) and the slave hydraulic cylinder (47) are communicated through a first oil pipe (45), and the second pipeline connection ports corresponding to each other are communicated through a second oil pipe (46).

2. The dual hydraulic control system for MR examination according to claim 1, wherein The push-pull rod of the main piston (42) is fixedly connected to the power output rod of the driving motor (44) through a connecting mechanism (43).

3. The dual hydraulic control system for MR examination according to claim 2, wherein The opposite ends of the connecting mechanism (43) are respectively fixedly clamped to the push-pull rod of the main piston (42) and the power output rod of the driving motor (44).

4. The dual hydraulic control system for MR examination according to claim 1, characterized in that, The first oil pipe (45) and the second oil pipe (46) are respectively provided with liquid supplement pipes (49) with one-way valves.

5. The dual hydraulic control system for MR examination according to claim 1, characterized in that, A sensor for feedback on the movement of the main piston (42) is further provided, and the sensor is electrically connected to the MR control device (21).

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