JPH07178169A - Mri injecting device - Google Patents

Abstract

PURPOSE:To hinder a bad magnetic influence on any of a motor, a drive power source or a control signal transmitting means, by using an ultrasonic wave rotating motor as the drive source, a battery power source as the power source, and a light connector as the control signal transmitting means. CONSTITUTION:Use is made of an ultrasonic wave rotating motor 42 as a drive motor of an injecting device 4 equipped within an electromagnetic shield room, and of a battery power source 44 as a drive power source. A cable 10a within the shield room is connected with an outside cable 10b by a light connector 20a, 20b. This prevents a phenomenon for an artifact to be generated in a diagnostic image, and dispenses with connecting a cable for the power source from outside to the infecting device 4, so that a flux from the power cable can be prevented. Also, generation of a magnetic field and a line of magnetic force exerting a bad magnetic influence on MRI from any one of the drive, power source and control portions can be prevented.

Description

Detailed Description of the Invention

[0001]

The present invention relates to MRI (Magnetic Reso
nance Imagi) injection device.

[0002]

2. Description of the Related Art Today, image diagnostic methods using MRI are widely used in the fields of brain and heart diagnosis. Also, M
In order to obtain a clear image of RI, it has been widely tried to inject a contrast agent or the like into the affected area for imaging. Figure 3
FIG. 1 is a diagram showing a configuration example of a recent general MRI diagnostic system, in which 1 is an electromagnetic shield room, 2 is an MRI magnet, 3 is a table on which a patient is placed, 4 is an injection device, and 5 is a contrast medium. 1 is a reservoir for storing the liquid, 6 is a monitoring window glass made of magnetic shielding glass, 7 is an MRI control unit, 8 is a control unit for an injection device, 9 and 10 are connection cables, and 11 is an operator.

The MRI diagnostic system is constructed as shown in FIG. 3, and in order to form a magnetic image, the MRI diagnostic system is entirely installed in the electromagnetic shield room 1 so as not to be affected by electromagnetic waves, and the power cable 9 for MRI is also installed. It is connected to the MRI apparatus via a magnetic shield filter (not shown). Also,
Conventionally, the injection of the contrast agent has been performed manually by a doctor, but it has been recently performed with the utmost care and for the purpose of reducing the burden on the doctor that high-pressure injection must be repeated many times. Automatic injection using the injection device 4 is performed. In short, the injection device 4 is configured such that the doctor pushes and pulls the syringe with a motor, and the syringe (to be exact, a piston rod).
To draw the contrast agent from the reservoir 5 into the syringe,
The syringe is pushed and the contrast medium is repeatedly injected into the patient automatically.

However, since the injection device 4 uses a motor, it adversely affects the MRI magnetically and causes an artifact in a diagnostic image. In order to solve this problem, the applicant of the present application filed a patent application for Japanese Patent Application No. 3-136971 “Medical Infusion Device” on May 14, 1991, and used an ultrasonic motor to prevent magnetic adverse effects. A preventive injection device is disclosed.

[0005]

As described above, the applicant of the present application has filed a patent application for an injection device that uses an ultrasonic motor to avoid magnetic adverse effects. Since a commercial power supply is used for the control unit and the control unit 8 and the device 4 are connected to each other by using a normal cable 10 for controlling them, a flux is generated from them and a diagnostic image is displayed. There is a problem that it causes an artifact.

The present invention has been made to solve the above problems, and does not cause a magnetic adverse effect in any of the motor, the driving power supply, and the control signal transmitting means.
It is an object of the present invention to provide an injection device for use.

[0007]

An MRI implanting apparatus according to the present invention has a means for using an ultrasonic rotary motor as its driving source, a means for using a battery power source as its power source, and its control signal transmitting means. And means for using the optical connector.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the configuration of the injection device of the present invention, in which 4 is the entire injection device, 6 is a monitoring window glass, 8 is a control unit for the injection device, 10a,
10b is a cable, and 20a and 20b are optical connectors. Further, in the injection device 4, 40 is a cylinder, 41
Is an actuator which is fixed to the piston rod of the cylinder and slides the piston rod in the direction of the arrow in the drawing, 42 is an ultrasonic rotary motor, 43 is a drive mechanism, 44 is a battery power source, and 45 is
Is a control circuit.

The injection device of the present invention is constructed as shown in FIG. 1 and is installed in the electromagnetically shielded room 1.
The ultrasonic rotation motor 42 is used as the driving motor of the above, and the phenomenon that the magnetic field is generated and the artifact is generated in the diagnostic image as in the conventional apparatus using the magnetic motor is prevented. Next, in the present invention, the battery power supply 44 is used as the drive power supply in order to prevent electromagnetic noise generated from the commercial power supply. This eliminates the need to connect the power supply cable to the injection device 4 from the outside and prevents the flux from the power supply cable. However, the control signal connection cable 10 from the injection device control unit 8 connected to the outside cannot be omitted because of the device configuration, so that electromagnetic noise from the outside is not mixed into the shield room 1 The cable 10a in 1 and the external cable 10b are connected by optical connectors 20a and 20b, and electromagnetic noise is blocked by these optical connectors.

That is, as shown in FIG. 1, in the MRI diagnostic system, generally, a part of the electromagnetically shielded room 1 is provided with a monitoring window 6 composed of a magnetically shielding glass 6 or the like, and a space between the glasses 6 is provided. By connecting with the optical connectors 20a and 20b, it is possible to prevent electromagnetic noise from getting into the electromagnetic shield room 1 and entering the cable 10a.

FIG. 2A is a diagram showing an embodiment of the optical connector used in the present invention. In the figure, 10a is a cable in the electromagnetic shield room 1 connected to the injection device 4, and 10b is a control unit. 20 is an optical connector installed inside the shield room, 20b is an optical connector installed outside the shield room, and 201a, 202a, ..., 20na are provided on the optical connector 20a side. Phototransistor, 2
01b, 202b, ... 20nb are optical connectors 20b
A light emitting diode provided on the side of the phototransistor 201, for example, the light emitting diode 201b emits light.
By receiving this light and converting it into an electric signal, a forms one information “ON” state.

Generally, the control information necessary for controlling this type of injecting device 4 is "ON / OFF of power supply", "injection speed (actuator sliding speed) setting", "injection pressure setting", For example, one set of combination of the light emitting diode 201b and the phototransistor 201a is used for the ON / OFF control information, and five sets of 202 to 206 are used for the "injection rate setting", and five sets of "injection pressure setting" are used. "
If there are also 5 levels, 5 sets of 207 to 211 are used, and a total of 1
It suffices to use the optical connectors 20a and 20b which are a combination of one set of the light emitting diode and the phototransistor.

FIG. 2B is a diagram showing another embodiment of the optical connector used in the present invention.
The same reference numerals denote the same or corresponding parts, 22 is a bit signal modulation / transmission circuit, 23 is a light emitting diode, 24 is a phototransistor, and 25 is a bit signal demodulation reception circuit. The optical connector in this embodiment uses, for example, a 5-bit digital signal, so that the above-mentioned "power supply O
N, OFF ”,“ Injection speed setting ”,“ Injection pressure setting ”
This is an example in which the control information of 1 is transmitted by the optical connector of the combination of the light emitting diode 23 and the phototransistor 24.

That is, the bit signal modulation transmission circuit 22
Is configured using, for example, IC-TC9132P, and 3
The carrier frequency of 8 kHz is modulated into a 5-bit signal based on the control information from the injection device control unit 8 to cause the light emitting diode 23 to emit light, which is then transmitted to the phototransistor 24 as an optical burst signal. The phototransistor 24 receiving this signal converts this signal into an electric signal, and the bit signal demodulating and receiving circuit 25 amplifies and demodulates it. The Schmitt circuit shapes the waveform and the data decoder converts it into an instruction code for control. This instruction is input to the circuit 45. With such a structure, the combination of the light emitting diode / phototransistor to be used can be one set. Needless to say, it is not necessary to bring the optical connector, that is, the light emitting diode 23 and the phototransistor 24 into contact with the glass 6 if the remote control operation using infrared rays is performed.

[0015]

As described above, the MRI implanting apparatus of the present invention has means for using an ultrasonic rotary motor as its driving source, means for using a battery power source as its power source, and its control signal transmitting means. By providing the means for using the optical connector, it is possible to prevent generation of a magnetic field or a magnetic force line that adversely affects the MRI magnetically from any of the drive unit, the power supply unit, and the control unit.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a configuration of an injection device of the present invention.

FIG. 2 is a diagram showing an embodiment of an optical connector used in the present invention.

FIG. 3 is a diagram showing a configuration example of an MRI diagnostic system.

[Explanation of symbols]

 4 injection device 6 monitoring window glass 8 control unit for injection device 10a, 10b cable 20a, 20b optical connector 22 bit signal modulation transmission circuit 23 light emitting diode 24 phototransistor 25 bit signal demodulation reception circuit 40 cylinder 41 actuator 42 ultrasonic motor 43 drive Mechanism 44 Battery power supply 45 Control circuit 201a, 202a, ... Phototransistor 201b, 202b, ... Light emitting diode

Claims (1)

[Claims] 1. An MRI (Magnetic Resonance Imagi) injecting device, means for using an ultrasonic rotary motor as a drive source thereof, means for using a battery power source for the power source, and an apparatus set in an electromagnetically shielded room. And a control unit for controlling this from the outside of the electromagnetic shield room, a means for providing an optical connector to the cable is provided, and by connecting the monitoring window glass provided in the electromagnetic shield room with the optical connector, the inside of the electromagnetic shield room An injection device for MRI, which is characterized in that it prevents the generation of a magnetic field and the mixing of electromagnetic noise.