JPH0584296A - Injection apparatus for medical use - Google Patents

Abstract

PURPOSE:To obviate the generation of a hazard by the generation of a magnetic filed and the shut off of line of magnetic force even when this apparatus is used in combination with magnetic apparatus, such as MRI, utilizing magnetism by constituting the entire part of a nonmagnetic material and using a motor which does not generate magnetic fields exclusive of magnetic motors, for example, an ultrasonic motor utilizing a piezoelectric element for a driving motor. CONSTITUTION:The motor 1 is energized by the control signal from a controller, by which the motor 1 rotates. The revolution thereof is transmitted via a revolution transmission mechanism 2 to a rotating member 3 and a screw 3a rotates in the direction of an arrow A. A sliding member 4 engaging with the screw 3a slides horizontally and an actuator 5 fixed to the sliding member 4 slides in the direction of an arrow B on rotating of the rotating member 3. The actuator 5 also presses a piston rod 11a of a syringe 11 fixed by a syringe holder 6 in the direction of an arrow C. The liquid chemical in the syringe 11 is pressed and is extruded into a catheter, etc., connected to the tip of the syringe 11 when the piston rod 11a is pressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical injection device for automatically injecting a contrast agent or a liquid medicine.

[0002]

2. Description of the Related Art FIG. 2 is a perspective view showing the outline of the construction of a medical injection device of this type. In FIG. 2, 11 is a syringe filled with a contrast agent or a drug solution, and 12 is a piston rod of the syringe 11. Syringe drive mechanism, 13 is a control device, 14 is a hand switch, 15 is a foot switch, 16 is a display device, and 17 is a stand.

FIG. 1 is a sectional view showing an embodiment of the present invention, which is the same as the conventional technique except for one motor, and the conventional technique will be described with reference to FIG. FIG. 1 is a cross-sectional view showing the configuration of the syringe drive mechanism 12 shown in FIG.
In the figure, the same reference numerals as those in FIG. 2 indicate the same or corresponding portions, and 1 is a motor, for example, a magnetic motor such as a stepping motor is used. Reference numeral 2 is a rotation transmission mechanism in which gears and the like are combined, 3 is a rotating member, and a screw portion 3a is formed on the outer periphery of the rotating member 3.

Reference numeral 4 denotes a sliding member formed of a nut portion that engages with the screw portion 3a, 5 an actuator fixed to the sliding member 4, and 6 a syringe holder for holding the syringe 11 fixed.

Next, the operation will be described. A control signal from the control device 13 shown in FIG. 2 energizes the motor 1 to rotate the motor 1, and this rotation is transmitted to the rotating member 3 via the rotation transmission mechanism 2 so that the screw 3a is indicated by an arrow A in the drawing. Rotate in the direction shown in. When the rotating member 3 rotates, the sliding member 4 that engages with the screw 3a slides horizontally, and the actuator 5 fixed to this sliding member 4 slides in the direction of arrow B (horizontal direction) in the drawing. To do.

The piston rod 11a of the syringe 11 in which the actuator 5 is fixed by the syringe holder 6 is
By pressing in the direction of arrow C in the drawing and pressing the piston rod 11a, the liquid medicine in the syringe 11 is pressurized,
It is pushed out to a catheter or the like (not shown) connected to the tip of the syringe 11.

In FIG. 1, the piston rod 11a and the tip 5a of the actuator 5 are drawn so as to simply contact and press, but in reality, by setting the syringe 11 in the syringe holder 6, the piston rod is set. 11a and the actuator tip 5a are fitted, the piston rod 11a can be pulled by rotating the motor 1 in the reverse direction, and the operation of filling the contrast medium or the drug solution into the syringe 11 can also be automatically performed. ing.

[0008]

The problem to be solved is that the conventional medical infusion device does not take into consideration the obstacle caused by the magnetic field generated. For example, MRI (Magnetic Resonance Imagi) is often used for recent diagnosis and treatment, and even if an MRI contrast agent is injected into the human body using this medical infusion device and a tomographic image is observed, The magnetic field generated by the motor and the magnetic substance such as iron forming each part may disturb the image, resulting in a problem that the device cannot be used in combination with a magnetic device such as MRI.

The present invention has been made to solve the above problems, and provides a medical injecting device which does not cause a trouble due to generation of a magnetic field or interruption of magnetic force lines even when used in combination with a device utilizing magnetism such as MRI. The purpose is to get.

[0010]

A medical infusion device according to the present invention is entirely made of a non-magnetic material, and a drive motor does not generate a magnetic field other than a magnetic motor, for example, an ultrasonic motor using a piezoelectric element. The use of is the most important feature.

[0011]

In the present invention, the whole is made of a non-magnetic material,
By using a motor other than a magnetic motor that does not generate a magnetic field, for example, an ultrasonic motor, as the drive motor,
Even when used in combination with a device that uses magnetism, such as, can prevent obstacles due to magnetic fields and lines of magnetic force.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 designate the same or corresponding parts, 1 is a motor, and the motor used in the present invention is a magnetic field other than a magnetic motor. A motor that does not generate, for example, an ultrasonic motor is used. Further, the syringe drive mechanism 12 excluding the control device 13, the hand switch 14, the foot switch 1
The display device 16 and the stand 17 are each made of a non-magnetic material such as stainless steel, aluminum, or plastic.

Next, the ultrasonic motor will be described. An ultrasonic motor uses ultrasonic vibration generated from a piezoelectric element when a piezoelectric element such as a piezo element is energized and vibrates the elastic body at a specific frequency to continuously advance the elastic body. There are a rotary type motor in which a piezoelectric element and an elastic body are bonded to each other to form a ring shape, a linear type ultrasonic motor in a linear shape, and the like. This ultrasonic motor has the characteristics that low speed and high torque can be obtained, and since it does not use the magnetic action as a principle, it has the characteristic that it is not affected by the magnetic field and is not affected by the magnetic field. have. Therefore, even if it is used together with a device that uses magnetism such as MRI, no trouble occurs due to the lines of magnetic force.

For example, diagnosis by MRI requires precise control of the injection rate of the contrast agent, and it is desirable to use a medical injection device capable of mechanically controlling the injection rate and injection amount and capable of remote control. However, the conventional medical injecting device could not be used in such a case because the damage due to the magnetic field was not taken into consideration at all. The present invention solves this. In addition, the embodiment shown in FIG.
Although the rotary ultrasonic motor is used as the drive motor, the rotation transmitting mechanism 2 can be omitted by using the linear ultrasonic motor.

[0015]

As described above, the medical infusion device of the present invention is entirely made of a non-magnetic material, and by using a motor other than a magnetic motor that does not generate magnetic lines of force, for example, an ultrasonic motor, as a drive motor. , MRI and the like can be used in combination with a device that uses magnetism, and there is an advantage that a medical injection device can be used for imaging and the like which could not be performed due to an obstacle due to magnetism.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a schematic configuration of the entire medical infusion device.

[Explanation of symbols]

 1 Motor 2 Rotation Transmission Mechanism 3 Rotating Member 4 Sliding Member 5 Actuator 6 Syringe Holder 11 Syringe 12 Syringe Drive Mechanism

Claims (1)

[Claims] 1. A medical injecting device comprising a non-magnetic material as a whole and a motor which does not generate a magnetic field other than a magnetic motor, for example, an ultrasonic motor using a piezoelectric element, as a drive motor.