CN114631800A

CN114631800A - Dual hydraulic control system for MR examination

Info

Publication number: CN114631800A
Application number: CN202210167384.0A
Authority: CN
Inventors: 王宇飞; 黄建敬; 李松徽
Original assignee: Guangzhou Youwo Medical Equipment Co ltd
Current assignee: Guangzhou Youwo Medical Equipment Co ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-06-17

Abstract

The invention discloses a dual hydraulic control system for MR examination, relates to MR examination auxiliary equipment, and aims to solve the problems that a ceramic ultrasonic motor in the prior art is expensive and low in power. The electromagnetic shielding device comprises a master hydraulic cylinder, a driving motor and a slave hydraulic cylinder, wherein the master hydraulic cylinder and the driving motor are arranged in a device room, and the slave hydraulic cylinder is arranged in an electromagnetic shielding layer between magnets; the secondary piston in the secondary hydraulic cylinder is connected with a needle cylinder piston of the high-pressure injector through a push-pull rod; a main piston in the main hydraulic cylinder is fixedly connected with a power output rod of a driving motor through a push-pull rod; the electric control end of the driving motor is externally connected with a control signal of the MR control equipment; the first pipeline connecting ports, corresponding to the master hydraulic cylinder and the slave hydraulic cylinder, are communicated through a first oil pipe, and the second pipeline connecting ports, corresponding to the master hydraulic cylinder and the slave hydraulic cylinder, are communicated through a second oil pipe. The device has the advantages of completely avoiding the arrangement of a ceramic ultrasonic motor and realizing the power output of the high-pressure injector with low cost, high power and high precision.

Description

Dual hydraulic control system for MR examination

Technical Field

The invention relates to an MR examination auxiliary device, in particular to a dual hydraulic control system for MR examination.

Background

Magnetic Resonance examination (MR) is an examination method in imaging.

The MR examination room mainly contains three functional rooms: a control room 10, a device room 20, and a magnet room 30, as shown in fig. 1.

The control room 10 is a space where the medical staff can locate during the scanning examination, and a human-computer interaction console 11 is arranged in the control room for inputting control instructions and visually knowing the working condition of the magnet room 30.

The equipment room 20 is a space where a medical staff member does not enter during a scanning examination, and a space where a maintenance staff member enters during a non-scanning period, and is provided with an MR control device 21 therein. The MR control apparatus 21 is communicatively connected to the human interactive console 11 and to the devices within the magnet room 30.

The magnet room 30 is another space where a medical staff can be in the scanning examination, and at least a high-pressure syringe 33 and an MR scanning apparatus 32 are provided therein. The MR scanning device 32 is a device for scanning a patient and is connected in communication with the MR control device 21 via a specific electromagnetically isolated signal line. The high-pressure syringe 33 is used for injecting a developer for MR examination into a patient. Since the MR scanning device 32 is a special ferromagnetic device, the magnet room 30 needs to be electromagnetically isolated from the outside by the fully enclosed electromagnetic shielding layer 31, while the inside of the electromagnetic shielding layer 31 does not allow any magnetic material, including materials that can be magnetized, such as ferrous metals.

Due to the strict limitation of the inside of the electromagnetic shielding layer 31 on magnetism, the power output of the high-pressure injector 33 has very strict requirements, and both high precision and high enough driving power are required. In the prior art, a non-magnetic power device 34 is arranged to drive the high-pressure injector 33, and the non-magnetic power device 34 is only a ceramic ultrasonic motor. The ceramic ultrasonic motor has extremely high cost, the output power of the ceramic ultrasonic motor does not exceed 10w, and the maximum torque of the ceramic ultrasonic motor is 1 N.m. The non-magnetic power unit 34 is an electrical product, and it is necessary to connect the MR control apparatus 21 with an electromagnetically isolated signal line, which is also an important factor in cost.

Disclosure of Invention

The present invention is directed to a dual hydraulic control system for MR examination to solve the above-mentioned problems of the prior art.

The invention relates to a dual hydraulic control system for MR examination, which comprises a master hydraulic cylinder, a driving motor and a slave hydraulic cylinder, wherein the master hydraulic cylinder and the driving motor are arranged in a device room;

the secondary piston in the secondary hydraulic cylinder is connected with a needle cylinder piston of the high-pressure injector through a push-pull rod; a main piston in the main hydraulic cylinder is fixedly connected with a power output rod of a driving motor through a push-pull rod; the electric control end of the driving motor is externally connected with a control signal of the MR control equipment;

the first pipeline connecting ports, corresponding to the master hydraulic cylinder and the slave hydraulic cylinder, are communicated through a first oil pipe, and the second pipeline connecting ports, corresponding to the master hydraulic cylinder and the slave hydraulic cylinder, are communicated through a second oil pipe.

The push-pull rod of the main piston is fixedly connected with the power output rod of the driving motor through a connecting mechanism.

And the two opposite ends of the connecting mechanism are fixedly clamped with a push-pull rod of the main piston and a power output rod of the driving motor respectively.

And the first oil pipe and the second oil pipe are respectively provided with a liquid supplementing pipe with a one-way valve.

And a sensor for feeding back the motion of the main piston is further arranged, and the sensor is electrically connected with the MR control equipment.

The dual hydraulic control system for the MR examination has the advantages that the arrangement of a ceramic ultrasonic motor is completely avoided, and the power output of a high-pressure injector with low cost, high power and high precision is realized.

Drawings

FIG. 1 is a schematic view of the inter-functional distribution of a prior art MR examination room;

FIG. 2 is a schematic diagram of the arrangement of the dual hydraulic control system of the present invention in an MR examination room;

FIG. 3 is a schematic diagram of the dual hydraulic control system of the present invention;

FIG. 4 is a schematic representation of a state change of the dual hydraulic control system of the present invention;

fig. 5 is a schematic view of the structure of the connection mechanism of the present invention.

Reference numerals:

10-control room, 11-man-machine interaction console;

20-inter-device, 21-MR control device;

30-between magnets, 31-an electromagnetic shielding layer, 32-MR scanning equipment, 33-a high-pressure injector and 34-a non-magnetic power device;

40-dual hydraulic control system, 41-master cylinder, 42-master piston, 43-connection mechanism, 44-driving motor, 45-first oil pipe, 46-second oil pipe, 47-slave cylinder, 48-slave piston and 49-liquid supplementing pipe.

Detailed Description

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

The slave piston 48 in the slave cylinder 47 is connected to the syringe piston of the high-pressure injector 33 via a push-pull rod. The master piston 42 in the master cylinder 41 is fixedly connected to a power take-off rod of a drive motor 44 via a push-pull rod. The electric control end of the driving motor 44 is externally connected with a control signal of the MR control device 21.

The master cylinder 41 and the slave cylinder 47 have first line connection ports that correspond to each other and communicate with each other through a first oil pipe 45, and have second line connection ports that correspond to each other and communicate with each other through a second oil pipe 46. The first oil pipe 45 and the second oil pipe 46 are respectively provided with a liquid supplementing pipe 49 with a one-way valve.

The push-pull rod of the main piston 42 is fixedly connected to the power take-off rod of the drive motor 44 via a connecting mechanism 43. The opposite ends of the connecting mechanism 43 are fixedly clamped with a push-pull rod of the main piston 42 and a power output rod of the driving motor 44 respectively.

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

Since the drive motor 44 is disposed within the equipment room 20 without electromagnetic confinement, a variety of high power, high precision, low cost drive motors known in the art, such as servo motors, may be selected. The limitation of the type of the ceramic ultrasonic motor is directly bypassed. Compared with the original ceramic ultrasonic motor, the control and feedback accuracy can be improved. Because the actual stroke and rate of the syringe plunger during the developer injection does not necessarily coincide with the theoretical control. The electromagnetic shielding layer 31 is strictly limited by electromagnetism, and cannot be configured with a sensor to feed back the condition of the syringe piston, and if the condition of the piston movement is not consistent with the theoretical control, the piston movement cannot be fed back to the MR control device 21, and naturally cannot be known in the human-computer interaction console 11. However, in the present invention, the slave piston 48 and the master piston 42 have opposite travel directions, and the absolute values of travel and speed are completely equal. The activity data of the master piston 42 can be accurately known through a sensor in the equipment room 20 which is not limited by electromagnetism, so that the motion condition of the slave piston 48 can be completely and dually known, and a control-feedback loop between the magnet room 30 and the equipment room 20 is realized.

The working principle is as follows:

the drive motor 44 receives a control signal from the pull rod, and outputs power to the master piston 42 to pull the master cylinder 41. The hydraulic oil in the master cylinder 41 passes through the second pipe connection port of the second oil pipe 46 and then enters the second pipe connection port of the slave cylinder 47, and correspondingly, the hydraulic oil in the slave cylinder 47 passes through the second pipe connection port 46 and then enters the first pipe connection port of the master cylinder 41. At this time, the slave piston 48 and its push-pull rod move in the direction from the inside of the hydraulic cylinder 47, and the syringe piston of the high-pressure injector 33 is driven to perform the contrast medium extraction.

The drive motor 44 receives a push rod control signal and outputs power to the master piston 42 to push the master cylinder 41. The hydraulic oil in the master cylinder 41 passes through the first pipe connection port of the master cylinder 45 and then enters the first pipe connection port of the slave cylinder 47, and correspondingly, the hydraulic oil in the slave cylinder 47 passes through the second pipe connection port of the slave cylinder 46 and then enters the second pipe connection port of the master cylinder 41. At this time, the slave piston 48 and its push-pull rod move in the direction out of the hydraulic cylinder 47, and the syringe piston of the high-pressure injector 33 is driven to inject the contrast medium.

It will be apparent to those skilled in the art that various other changes and modifications may be made in the above-described embodiments and concepts and all such changes and modifications are intended to be within the scope of the appended claims.

Claims

1. A dual hydraulic control system for MR examination, characterized by comprising a master cylinder (41) disposed in an equipment room (20), a drive motor (44), and a slave cylinder (47) disposed in an electromagnetic shield layer (31) between magnets (30);

the slave piston (48) in the slave hydraulic cylinder (47) is connected with the syringe piston of the high-pressure injector (33) through a push-pull rod; a main piston (42) in the main hydraulic cylinder (41) is fixedly connected with a power output rod of a driving motor (44) through a push-pull rod; the electric control end of the driving motor (44) is externally connected with a control signal of the MR control equipment (21);

the master cylinder (41) and the slave cylinder (47) are communicated with each other through a first pipe (45) and a second pipe (46).

2. Dual hydraulic control system for MR examinations according to claim 1 characterized in that the push-pull rod of the main piston (42) is fixedly connected to the power take-off rod of the drive motor (44) by means of a connecting mechanism (43).

3. A dual hydraulic control system for MR examinations according to claim 2 characterized in that the opposite ends of the connecting means (43) are fixed to engage with the push-pull rod of the main piston (42) and the power take-off rod of the drive motor (44), respectively.

4. The dual hydraulic control system for MR examination according to claim 1, wherein the first oil pipe (45) and the second oil pipe (46) are each provided with a fluid replenishing pipe (49) having a check valve.

5. Dual hydraulic control system for MR examinations according to claim 1 characterized in that there is also a sensor for feedback of the movement of the main piston (42), which is electrically connected to the MR control device (21).