WO2013129570A1

WO2013129570A1 - Medical liquid injection device

Info

Publication number: WO2013129570A1
Application number: PCT/JP2013/055394
Authority: WO
Inventors: 根本　茂
Original assignee: 株式会社根本杏林堂
Priority date: 2012-02-29
Filing date: 2013-02-28
Publication date: 2013-09-06
Also published as: JP6121399B2; JPWO2013129570A1; JP6340450B2; JP2017136411A

Abstract

The present invention provides a medical liquid injection device which is configured so as to accurately obtain the position of an end of the piston to thereby perform desired operation. A medical liquid injection device (100) has: a piston drive mechanism (130) provided with a piston pressing unit which presses an end of the piston of a held syringe in order to move forward the piston; and a proximity sensor (132) which detects the distance between the piston and the piston pressing unit. The operation of the piston pressing unit is controlled so that, on the basis of the result of detection of the distance by the proximity sensor (132), the movement speed of the piston pressing unit is reduced in the last predetermined section of preparatory operation in which the piston pressing unit is moved from the initial position until the piston pressing unit is in contact with the end of the piston.

Description

Chemical injection device

The present invention relates to a chemical solution injection device that injects a chemical solution in a syringe into a subject, and more particularly to a chemical solution injection device having a piston drive mechanism that pushes a piston of a syringe into a cylinder for injection of the chemical solution.

Examples of medical diagnostic imaging apparatuses include CT apparatuses, MRI apparatuses, PET apparatuses, angio apparatuses, and MRA apparatuses. When these devices are used, a chemical solution such as a contrast medium or physiological saline is often injected into the subject.

Usually, the drug solution is filled in the syringe. The syringe has a cylinder that stores a chemical solution and a piston that is inserted into the cylinder so as to be movable back and forth. An injection needle or catheter is connected to the tip of the cylinder via an extension tube, and the injection needle or catheter is punctured into the blood vessel of the subject, and the piston is advanced in that state to inject the drug solution in the syringe into the subject. can do.

In image diagnosis, in order to obtain a good image, it is required to inject a chemical solution at a predetermined time, speed, and injection amount. Therefore, a chemical injection device is often used for injection of the chemical.

As an example of a conventional chemical solution injection device, there is a device disclosed in Patent Document 1. The chemical liquid injector disclosed in Patent Document 1 includes a piston drive mechanism including a piston pressing portion that presses the end of a piston of a syringe attached to the chemical liquid injector, and a control unit that controls the operation of the piston drive mechanism. have. A data carrier such as an IC tag or a two-dimensional code is attached to the syringe. Data on the syringe and data on the chemical solution are recorded on the data carrier.

The chemical injection device further has a reader for acquiring the data recorded on the data carrier, and calculates the position of the end of the piston based on the data acquired from the data carrier and the data input by the operator Then, the moving distance and moving speed of the piston pressing portion in the following stages are determined, and the operation of the piston driving mechanism is controlled according to the determined conditions. That is, in the preparation stage where the piston pressing portion moves forward from the initial position to a position where it abuts against the end of the piston, the moving speed in the last predetermined section in the moving stroke of the piston pressing section is made slower than the other sections. At the injection stage where the piston drive mechanism is controlled and the piston pressing part is moved from the position where it abuts the end of the piston to the position where the injection of the predetermined amount of the chemical solution is completed, the injection speed calculated based on the above data is used. The piston drive mechanism is controlled so that the chemical solution is injected.

Patent Document 1: International Publication No. 2008/123524

However, since the chemical injection device disclosed in Patent Document 1 obtains at least a part of data for determining the end of movement of the piston pressing portion in the preparation stage from the data carrier attached to the syringe, the data With a syringe not equipped with a carrier, the above-described operation at the preparation stage could not be performed. For example, when a chemical injection device is used to capture a tomographic image by an MR device, the chemical injection device is exposed to a strong magnetic field, and thus an IC tag using RFID technology cannot be used as a data carrier. Although it is possible for the operator to input all the data necessary for the operation in the preparation stage, in that case, the number of data to be input by the operator increases, the burden on the operator increases, and data input The possibility of mistakes increases.

Also, in the actual syringe, there is some variation in the position of the piston end, and there may be a deviation from the position obtained from the data. If there is a gap between the actual position of the piston end and the position of the piston end determined from the data, the piston pressing part will advance too much in the preparation stage and chemicals will be injected, or the piston pressing part will be injected in the preparation stage. Since the piston is not pressed until the piston end comes into contact with the piston end in the next injection stage without contacting the piston end, only a smaller amount than the planned amount is injected.

An object of the present invention is to provide a chemical injection device that can more accurately determine the position of the piston end even when a syringe without a data carrier is used, thereby enabling a desired operation. .

The chemical solution injection device of the present invention comprises:
A syringe holding unit that detachably holds a syringe having a cylinder and a piston inserted into the cylinder so as to be movable back and forth;
A piston drive mechanism having a piston pressing portion operated to press the end of the piston for at least advancing the piston of the syringe held by the syringe holding portion;
Have
A chemical injection device in which the operation of the piston drive mechanism is controlled so that the moving speed of the piston pressing portion decreases in the last predetermined section of the preparation operation for moving the piston pressing portion from the initial position to a position where it abuts against the end of the piston. There,
Further comprising a detector arranged to detect the distance between the piston and the piston pressing part;
The operation of the piston pressing portion in the preparation operation is configured to be controlled based on the detection result by the detector.

In the chemical injection device of the present invention, the detector can detect the distance between the detector and the object in the forward direction of the piston pressing portion during the preparatory operation. In this case, detection is performed by the detector during the preparatory operation, and when the distance detected by the detector becomes a predetermined distance or less, the operation of the piston pressing portion is controlled so that the moving speed of the piston pressing portion is reduced. May be. Furthermore, the operation of the piston pressing unit may be controlled so that the forward movement of the piston pressing unit stops at a position where the distance detected by the detector becomes zero. Alternatively, when the chemical injection device further includes a device for manually operating the movement of the piston pressing portion, the position where the distance detected by the detector is a second distance smaller than the predetermined distance Thus, the operation of the piston pressing portion may be controlled so that the forward movement of the piston pressing portion stops. Alternatively, when the chemical injection device further includes a device for manually operating the movement of the piston pressing portion and the detectable range of the distance by the detector is 10 mm or less, the time when the detector detects the object Then, the forward movement of the piston pressing portion may be stopped.

In one aspect of the present invention, the detector is a proximity sensor provided in the piston pressing portion. In this case, the proximity sensor is preferably an optical proximity sensor.

According to the chemical injection device of the present invention, even when a finger is about to be sandwiched between the piston and the piston pressing portion by reducing the moving speed of the piston pressing portion in the last predetermined section of the preparation operation. It can be easily avoided. In addition, since the movement of the piston pressing portion in the preparatory operation is controlled based on the distance between the piston and the piston pressing portion detected by the detector, even if the syringe is not mounted with a data carrier, Regardless of the position variation and the type of syringe, the piston pressing portion can be reliably stopped at the position where it abuts against the end of the piston.

It is a perspective view of an example of a diagnostic imaging system to which the present invention is applied. It is a perspective view of the chemical injection device shown in FIG. It is a perspective view which shows the injection | pouring head shown in FIG. 2 with the syringe with which it is mounted | worn. FIG. 3 is a block diagram functionally illustrating the chemical liquid injector illustrated in FIG. 2. It is a perspective view which shows an example of arrangement | positioning of the 2nd display device which the chemical | medical solution injection device of this invention can be equipped. It is a perspective view which shows the other example of arrangement | positioning of the 2nd display device which the chemical | medical solution injection device of this invention can be equipped. It is a perspective view which shows an example of the articulated support arm assembly fixed to the ceiling which can be used by this invention. It is a top view of the syringe which can be used by this invention.

Referring to FIG. 1, there is shown an example of an image diagnostic system 1000 to which the present invention is applied, which includes a chemical injection device 100 and a fluoroscopic imaging device 300 that can be, for example, an MRI apparatus. The fluoroscopic imaging device 300 and the chemical liquid injector 100 are connected to each other so that information can be transmitted and received between them.

The fluoroscopic imaging apparatus 300 includes a scanner 301 that executes an imaging operation, and an imaging control unit 302 that controls the operation of the scanner 301. In FIG. 1, all the components of the diagnostic imaging system 1000 are shown to be arranged in the same room. However, when actually capturing a fluoroscopic image of a subject, the scanner 301 and the chemical injection device 100 are the same. Arranged in the room, the imaging control unit 302 is arranged in a separate room.

For example, as shown in FIG. 2, the chemical injection device 100 includes an injection head 110 attached to the upper portion of a stand 111 via a swivel arm 112, and an injection control unit 101 connected to the injection head 110 via a cable 102. have. The injection control unit 101 includes a main operation panel 103, a touch panel 104 that serves as both a display device and an input device, and a hand unit 107 that is an auxiliary input device connected by a cable.

As shown in FIG. 3, the injection head 110 has a casing 120, and two concave portions 114 are formed as syringe holding portions on the upper surface thereof. The syringe 200 is detachably attached to each recess 114. Each syringe 200 can be filled with a different drug solution. For example, one of the syringes 200 may be filled with a contrast medium, and the other may be filled with physiological saline.

The syringe 200 has a cylinder 210 and a piston 220 for holding a chemical solution. The piston 220 is inserted into the cylinder 210 so as to be movable forward and backward, and the chemical liquid can be pushed out of the cylinder 210 by moving the piston 220 forward. A branch tube 250 is connected to the tip of the cylinder 210. An injection needle or a catheter is connected to the distal end of the branch tube 250, and the medical solution in the syringe 200 is injected into the subject by advancing the piston 220 in a state where the injection needle or the catheter is punctured into the blood vessel of the subject. A flange is formed at each of the end of the cylinder 210 and the end of the piston 220.

The injection head 110 has two piston drive mechanisms 130 for operating the piston 220 of the syringe 200 attached to the recess 114. Each piston drive mechanism 130 has a rod provided with a piston pressing portion 131 at the tip. The front end surface of the piston pressing portion 131 can detect the distance between the piston 220 and the piston pressing portion 131, particularly the distance between the end surface of the piston 220 and the front end surface of the piston pressing portion 131. Further, a proximity sensor 132 is arranged as a detector that can detect the distance from the object in the forward direction of the piston pressing portion 131 during the preparatory operation.

Each rod is moved forward and backward using a motor 145 (see FIG. 4) provided for each rod as a drive source, and the piston pressing portion 131 moves forward and backward as the rod moves. The piston pressing portion 131 can advance to abut the end (flange) of the piston 220, and further press the end of the piston 220 to advance the piston 220. Each rod can be operated independently of each other, whereby the liquid medicine in the syringe 200 can be injected separately or simultaneously.

The piston pressing part 131 can be separated from the end of the piston 220 by retreating. However, when the piston pressing part 131 includes a chuck that holds the end of the piston 220, the piston pressing part 131 is retracted. The piston 220 can also be retracted. At this time, if a chemical solution container (not shown) is connected to the extension tube 250, the piston 220 can be retracted to suck the chemical solution from the chemical solution container into the syringe 200.

FIG. 4 is a block diagram showing a functional configuration of the above-described chemical injection device 100. Each block illustrated in FIG. 4 may be configured as hardware or may be configured as a logic circuit.

4, the injection head 110 has a piston drive mechanism 130, and the piston drive mechanism 130 includes a proximity sensor 132 and a motor 145. In the present embodiment, two piston drive mechanisms 130 are provided, but only one is shown in FIG. 4 for simplification.

There are various types of proximity sensors 132 such as an inductive type, a capacitance type, an ultrasonic type, an electromagnetic type and an optical type. In the present invention, the front end surface of the piston pressing portion 131 and the end surface of the piston 220 are provided. Any type of sensor can be used as long as it can detect the distance between the two.

Among these, the optical proximity sensor 132 is preferable. The optical proximity sensor 132 includes a light emitting element that emits light of a specific wavelength and a light receiving element that receives light of the same wavelength as the light emitted from the light emitting element and converts it into an electrical signal, and is emitted from the light emitting element. The distance to the object can be measured based on the intensity of the light reflected by the object (the end surface of the piston 220 in this embodiment) and received by the light receiving element. The optical proximity sensor 132 has a simple structure and simple control. In addition, the optical proximity sensor 132 is not affected by a magnetic field, and thus is particularly suitable when the chemical injection device 100 is used together with an MRI apparatus.

Among the optical proximity sensors 132, there are those using infrared rays, those using red light, and those using blue light, and those having an LED light source and those having a laser light source as a light source. There is. In the present invention, any type of proximity sensor 132 can be used. Among them, for example, the red LED proximity sensor 132 is preferably used because it is relatively easy to handle and easily available.

The injection control unit 101 includes a control unit 141, an input device 142, and a display device 143. The input device 142 corresponds to the main operation panel 103 and the touch panel 104 shown in FIG. 2, receives information related to the setting of the chemical liquid injector 100 and data necessary for determining the chemical liquid injection conditions, and the control unit 141. Device to send to. The display device 143 corresponds to the touch panel 104 shown in FIG. 2, and is a device that displays various information and data related to the setting and operation of the chemical liquid injector 100 according to commands from the control unit 141.

The control unit 141 includes, for example, a microprocessor, and determines the injection condition of the chemical solution based on the data and information input from the input device 142, controls the operation of the display device 143, and the injection head 110. It is configured to control the operation of the. The control of the injection head 110 by the control unit 141 is mainly the control of the piston drive mechanism 130, and for this purpose, the control unit 141 includes a motor control unit 144 that controls the operation of the motor 145. When the injection head 110 has a plurality of piston drive mechanisms 130 as in the present embodiment, the motor control unit 144 is configured to be able to individually control the motors 145 of the plurality of piston drive mechanisms 130. .

The motor control unit 144 controls the overall operation of the piston drive mechanism 130. For example, when injecting a chemical solution, the motor control unit 144 only controls the driving speed and time of the motor 145 so that the chemical solution is injected according to the determined injection conditions. In addition, the operation of the piston drive mechanism 130 in the preparatory operation performed prior to the injection operation can be controlled. A distance detection result by the proximity sensor 132 is input to the motor control unit 144, and the motor control unit 144 uses the detection result input from the proximity sensor 132 when controlling the piston drive mechanism 130 in the preparation operation.

Next, the operation of the chemical liquid injector 100 according to this embodiment will be described.

When the chemical solution injection device 100 is turned on, a function check of the chemical solution injection device 100 is executed. In this function check, the position of the piston pressing part 131 is confirmed, and if the piston pressing part 131 is not located at the initial position which is the rear end position farthest from the piston 220 in the movement range, it is moved to the initial position. .

When the syringe 200 is attached to the injection head 110, the chemical injection device 100 executes a preparation operation. Switching to the preparatory operation can be performed automatically by providing an appropriate sensor for detecting that the syringe 200 is attached to the injection head 110 and using a detection signal from the sensor as a trigger, or through the input device 142. It can also be performed by an operator's operation.

In the preparation operation, the motor control unit 144 controls the operation of the motor 145 so that the piston pressing unit 131 moves forward until the front end surface of the piston pressing unit 131 comes into contact with the end surface of the piston 220 of the attached syringe 200. To do. Further, during the preparation operation, the distance from the end face of the piston 220 by the proximity sensor 132 is continuously detected. When the distance detected by the proximity sensor 132 becomes zero by the control of the motor control unit 144, that is, when the piston pressing unit 131 contacts the end surface of the piston 220, the movement of the piston pressing unit 131 is stopped. The At this time, in order to alert the operator, the chemical liquid injector may notify the stop of the movement of the piston pressing portion 131 by voice.

Furthermore, the motor control unit 144 determines the piston drive mechanism 130 so that the moving speed of the piston pressing unit 131 decreases in the last predetermined section of the preparation operation based on the detection result by the proximity sensor 132 as compared with other sections. Control the behavior. For example, the movement range of the piston pressing portion 131 is changed to the first section from the initial position to a predetermined intermediate position, and the movement end position from the predetermined intermediate position (position where the piston pressing portion 131 contacts the end face of the piston 220). The operation of the motor 145 is controlled so that the moving speed of the piston pressing portion 131 in the second section is slower than the moving speed of the piston pressing portion 131 in the first section. To do. The fact that the piston pressing portion 131 has moved from the first section to the second section can be known from the distance to the end face of the piston 220 detected by the proximity sensor 132, and actually the distance detected by the proximity sensor 132. Is less than a predetermined distance, the operation of the motor 145 is controlled so as to reduce the moving speed of the piston pressing portion 131. At this time, in order to call attention to the operator, the chemical liquid injector may notify by voice that the moving speed of the piston pressing portion 131 has been reduced.

As described above, by making the moving speed of the piston pressing portion 131 in the second section slower than the moving speed in the first section, for example, the operator can move between the piston 220 and the piston pressing section 131 during the preparation operation. Even when a finger is inserted by mistake, it is easy to avoid the operator's finger being pinched between the piston 220 and the piston pressing portion 131.

From this point of view, the second section is a section in which a finger may be caught due to carelessness of the operator, and the length thereof is, for example, 58 to 50 mm, preferably 8 to 30 mm. it can. The length of the second section in which the moving speed of the piston pressing portion 131 is reduced can be set as appropriate in consideration of the thickness of the operator's finger, the operation efficiency of the chemical liquid injector 100, and the like.

The moving speed of the piston pressing portion 131 in the second section is preferably 0.05 to 5 mm from the viewpoint of easily avoiding the operator's finger being pinched between the piston 220 and the piston pressing portion 131. / Sec, more preferably 0.5 to 3 mm / sec. Further, the moving speed of the piston pressing portion 131 in the second section may be constant, or may be gradually decreased so as to become zero at the moving end.

As described above, in the present invention, the position of the piston pressing portion 131 in the preparation operation is not the amount of movement from the initial position of the piston pressing portion 131 but the distance between the end of the piston 220 and the piston pressing portion 131. Detected. That is, in the present invention, the distance from the initial position to the end face of the piston 220 is obtained based on the data acquired from the data carrier as in the prior art, and the piston pressing portion 131 is not moved by that distance, but the piston 220 is moved. On the basis of the actual distance to the end face, the piston pressing portion 131 is moved until the distance becomes zero.

As a result, the piston pressing portion 131 can be reliably stopped at the position where the piston pressing portion 131 comes into contact with the end surface of the piston 220 without depending on variations in the position of the piston 220. In addition, depending on the type of chemical liquid to be injected, the injection amount, and the like, a plurality of types of syringes having the same diameter but different internal volumes may be used. Even in such a case, according to the present invention, the piston pressing portion 131 can be reliably stopped at a position where the piston pressing portion 131 contacts the end surface of the piston 220.

Furthermore, since it is not necessary for the syringe 200 to include a data carrier, a preparatory operation can be performed for any syringe. This is particularly effective when the chemical injection device 100 is used with an MRI apparatus. In general, an IC tag using RFID technology is often used as a data carrier, and it is difficult to acquire data using such RFID technology in the vicinity of an MRI apparatus that generates a strong magnetic field.

In the case where the proximity sensor 132 disposed in the piston pressing part 131 is used as a detector for detecting the distance between the end of the piston 220 and the tip of the piston pressing part 131, during the preparation operation, If an obstacle such as an operator's finger is interposed between the piston pressing portion 131 and the proximity sensor 132 cannot detect the distance between the piston 220 and the piston pressing portion 131. Instead, the proximity sensor 132 actually detects the distance between the obstacle and the piston pressing portion 131 unless the obstacle is excluded.

Therefore, the movement end position of the piston pressing portion 131 is a position where the piston pressing portion 131 comes into contact with an obstacle, and the motor control unit 144 controls the operation of the piston pressing portion 131 based on this position. Specifically, the second section is determined based on the position where the piston pressing portion 131 contacts the obstacle, and the moving speed of the piston pressing portion 131 is decreased in the second section, and finally the position where the piston pressing section 131 contacts the obstacle. Thus, the movement of the piston pressing portion 131 is stopped. As a result, during the preparatory operation, for example, even if the operator keeps the finger inserted between the piston 220 and the piston pressing portion 131, the piston pressing portion 131 is stopped at the position where it abuts on the finger. Therefore, the operator's finger can be prevented from being pinched.

Thus, the detector is intended to detect “the distance between the end surface of the piston 220 and the front end surface of the piston pressing portion 131”, but the distance detected by the detector is “the piston pressing portion. It can be said that the distance between the end of the object facing the piston pressing portion 131 in the forward direction of 131 and the front end surface of the piston pressing portion 131. Here, “the object facing the piston pressing portion 131 in the forward direction of the piston pressing portion 131” is “the piston 220” if nothing is interposed between the piston 220 and the piston pressing portion 131. If there is an interposition, it is an “object” such as an intervening operator's finger.

After the preparation operation is completed, some data for determining the injection condition of the chemical solution is input by the operator. The control unit 141 determines the driving condition of the motor 145 of the piston driving mechanism 130 so that the piston pressing unit 131 operates according to the determined injection condition.

Thereafter, the operator performs a predetermined operation for executing the chemical liquid injection operation, so that the motor control unit 144 drives the motor 130 according to the determined driving condition. Accordingly, the piston 220 is advanced by the piston pressing portion 131, and the chemical solution in the syringe 200 is pushed out of the syringe 200. That is, a chemical solution injection operation is executed. By this injection operation, the chemical solution is injected under predetermined injection conditions.

The stop position of the piston pressing part 131 in the preparatory operation is a position where the piston pressing part 131 is in contact with the end face of the piston 220. Therefore, if the piston pressing part 131 is advanced with the position as a reference position, the reference position The movement amount of the piston pressing part 131 from the position is exactly proportional to the injection amount of the chemical solution. Accordingly, it is possible to shift from the preparation operation to the injection operation without fine adjustment or correction of the position of the piston pressing portion 131 prior to the injection operation.

After completion of the injection operation, the control unit 141 may retract the piston pressing unit 131 to the initial position. At this time, when the piston pressing part 131 does not have a chuck for holding the end of the piston 220, only the piston pressing part 131 moves backward, but when the piston pressing part 131 has a chuck, it is together with the piston pressing part 131. The piston 220 also moves backward.

Here, as shown in FIG. 4, the injection head 110 may have an input device 134 so that the piston drive mechanism 130 can be operated manually. As the input device 134 provided in the injection head 110, a button, a slide switch, a jog dial, or the like can be used. In addition to the control by the control unit 141, the motor 145 can be arbitrarily operated by the input device 134 according to the input operation from the input device 134. Alternatively, a mechanical mechanism that can directly move the piston pressing portion 131 without using the operation of the motor 145 can be used as the input device 134.

However, in applying the operation of the motor 145 according to the command from the input device 134 to the present invention, the piston pressing portion 131 is further advanced in the section in which the moving speed of the piston pressing portion 131 is reduced during the preparatory operation. It is preferable that an input operation from the input device 134 to be promoted is invalidated by a command from the control unit 141. In other sections, the operation by the input operation from the input device 134 may be prioritized over the operation by the control of the motor control unit 144.

Further, when the input device 134 for enabling the piston drive mechanism 130 to be manually operated is included, the control unit 141 uses the second distance in which the distance detected by the proximity sensor 132 is smaller than the distance in the second section. Then, the operation of the piston drive mechanism 130, that is, the piston pressing portion 131 may be controlled so that the forward movement of the piston pressing portion 131 is stopped. Thereby, in the preparatory operation, it is possible to prevent erroneous injection of the chemical liquid due to the piston piston pressing portion 131 moving forward too much and moving the piston 220 forward. After the advancement of the piston pressing part 131 is stopped, the operator can manually advance the piston pressing part 131 using the input device 134 until the piston pressing part 131 contacts the piston 220. Whether the piston pressing part 131 is in contact with the piston 220 may be determined visually. The second distance can be, for example, 2 to 10 mm, preferably 3 to 8 mm.

As described above, the case where the detector that detects the distance between the piston pressing portion 131 and the object in the forward direction is the proximity sensor 132 has been described, but the detector does not have to be the proximity sensor 132. Any distance measuring sensor can be used. Also, the detector mounting position is not limited to the piston pressing portion 131, but can be set appropriately according to the detector to be used.

When the detector is an optical proximity sensor 132, it is preferable to dispose the proximity sensor 132 on the front end surface of the piston pressing portion 131 as described above. The optical proximity sensor 132 detects the distance from the end surface of the piston 220 based on the intensity of light received by the light receiving element. Therefore, in order to improve the detection accuracy, the proximity sensor 132 is separated from the light emitting element. It can arrange | position so that the optical axis of the emitted light may become parallel to the moving direction of the piston press part 131. FIG. However, when the light source of the light-emitting element is an LED or the like that emits light that travels in a spread manner, not only the end face of the piston 220 but also the piston pressing portion depending on the directivity of light and the reflection characteristics of the piston pressing portion 131. The light reflected by 131 is also received, and as a result, an accurate distance may not be detected.

Therefore, the light emitted from the light emitting element to the extent that the intensity of the light reflected by the piston pressing portion 131 and reaching the light receiving element of the proximity sensor 132 does not affect the distance detection by the proximity sensor 132. The optical axis is preferably inclined with respect to the traveling direction of the piston pressing portion 131.

Moreover, although embodiment mentioned above demonstrated the case where detection by a detector is performed continuously until the distance between the piston press part 131 and the end surface of the piston 220 becomes zero during preparatory operation, The encoder included in the motor 145 is not the detection result by the detector or is collated with the detection result by the detector in the last predetermined section (the above-described second section) of the preparation operation for reducing the moving speed of the pressing unit 131. Based on the relationship between the count number (not shown) and the moving distance of the piston pressing portion 131, the moving speed of the piston pressing portion 131 in a predetermined section can be controlled.

Furthermore, when the input device 134 for enabling the piston drive mechanism 130 to be manually operated and the detectable distance by the detector is 10 mm or less, the movement of the piston pressing portion 131 in a predetermined section is performed. The speed may be zero. That is, the control unit 141 may stop the advancement of the piston pressing unit 131 when the detector detects an object. In this sense, the decrease in the moving speed of the piston pressing portion in the predetermined section in the present invention includes that the moving speed of the piston pressing portion is zero, that is, the piston pressing portion is stopped.

When the detector detects an object, the advancement of the piston pressing part 131 is stopped, so that when an obstacle exists as an object between the piston 220 and the piston pressing part 131, the obstacle is separated from the piston 220. It is possible to reliably prevent pinching with the piston pressing portion 131. When there is no obstacle between the piston 220 and the piston pressing part 131, the piston pressing part 131 stops operating before contacting the piston 220. Thereafter, the operator uses the input device 134 to The piston pressing portion 131 can be manually advanced until the pressing portion 131 contacts the piston 220. Note that when the advancement of the piston pressing part 131 is stopped, the chemical injection device may notify the stop of the movement of the piston pressing part 131 by voice so as to alert the operator.

In the above-described embodiment, the case where only the injection control unit 101 includes the display device 143 has been described. However, the chemical injection device is a second display device separately from the display device 143 provided in the injection control unit 101. Can also be provided.

Usually, the injection head 110 is arranged in the examination room together with the fluoroscopic imaging device 300 (see FIG. 1), and the injection control unit 101 is arranged in the operation room adjacent to the examination room. The examination room and the operation room are separated from each other through a glass window so that the examination room can be observed from the operation room. Various settings relating to the injection of the chemical solution are performed by the operator appropriately operating the injection control unit 101 disposed in the operation chamber. In the preparation stage for injection, the injection needle is inserted into the subject or the catheter is inserted, and the tube The operator performs various operations in the examination room to evacuate the inside and confirm the operation of the injection head 110. In order to enable the operator to check the injection conditions and the like without moving to the operation room at this preparation stage, the second display device is preferably arranged in the examination room.

The second display device A151 displays various data relating to the injection of the chemical solution, for example, the imaging target region, the weight of the subject, the injection rate of the chemical solution, the injection amount of the chemical solution, the type of the chemical solution to be injected, the injection protocol of the chemical solution can do. At the same time, when the operation of the piston pressing portion is stopped in the preparation operation and the injection operation, a message or an icon can be displayed.

The second display device is preferably arranged in the vicinity of the injection head, particularly in the examination room. For example, the second display device can be provided integrally with the injection head or provided on a member that supports the injection head. Referring to FIG. 5, an example of a second display device A151 provided integrally with the injection head 110 is shown. On the other hand, in the example shown in FIG. 6, the injection head 110 and the second display device A151 are supported by the head support structure A158. The head support structure A158 may be a part of a known movable stand or a part of an articulated support arm assembly fixed to the ceiling. As shown in FIG. 7, the support arm assembly 160 may include, for example, a base portion 161 fixed to the ceiling and an articulated arm portion 163 extending from the base portion 161. In the example shown in FIG. 7, the second display device A151 is attached to the middle part of the arm of the sub-zero part 163 that extends in the vertical direction and has the injection head 110 attached to the lower end.

The second display device A151 is connected to the head support structure A158 via a coupling mechanism A155. Although not particularly limited, the second display device A151 may be positioned above the injection head 110 at a distance from the injection head 110. For example, the coupling mechanism A155 may hold the injection head 110 so that the injection head 110 can rotate around the vertical axis and / or the horizontal axis. The connection between the second display device A151 and the injection head 110 and / or the injection control unit 101 (see FIG. 2 and the like) may be a wired connection via a cable or a wireless connection.

According to the configuration as described above, the orientation of the second display device A151 can be adjusted in a wide range in the vertical and horizontal directions regardless of the orientation of the injection head 110, so that the operator can adjust the second display device A151. Will be easier to see. In addition, by disposing the second display device A151 at a distance from the injection head 110, the second display device A151 is disposed at an optimum position where the influence of noise on the injection head 110 and other devices is difficult. Can do. Furthermore, by making the second display device A151 wirelessly connected, noise propagation through the cable can be prevented.

∙ Noise includes external noise that the detector may receive. In some cases, the detector may erroneously detect the noise. In the examination room, various noises including radio waves, electromagnetic waves, X-rays, fluorescent lamps, and radio waves exist. Minimizing the effects of these noises is important to the present invention.

The second display device A151 is preferably a touch panel. Preparation is performed by using the second display device A151 as a touch panel so that the second display device A151 can perform data input for setting injection conditions and the like, and start and stop operations of the injection head 110. When the injection condition is changed or the injection is stopped in the stage and the initial stage of the injection, the operator can change the injection condition on the spot without returning to the operation room. When changing the injection conditions or stopping the injection, for example, when the subject's physical condition is not good and it is judged that the injection conditions should be relaxed rather than the normal injection conditions, For example, when leakage occurs.

In the above-described embodiment, the chemical injection device 100 compatible with the MRI apparatus has been described as an example. However, the present invention is not limited thereto, and any fluoroscope such as a CT apparatus, a PET apparatus, an angio apparatus, and an MRA apparatus can be used. It can be adapted to the imaging device.

In the present invention, the operation of the piston drive mechanism in the preparatory operation is controlled based on the detection result by the detector. However, the detection result from the detector could not be obtained due to a failure of the detector. In some cases, in the preparatory operation, the piston pressing part pushes the piston of the syringe, and an erroneous injection of the chemical solution may occur. Therefore, in order to prevent such a situation from occurring, the chemical liquid injector is preferably further provided with a safety device for the piston drive mechanism.

As a safety device for the piston drive mechanism, various means capable of detecting that the tip of the piston pressing portion has contacted another object can be used, for example, a switch, a piston pressing the operating body, and the like. The object to the tip surface of the piston pressing part is installed by protruding from the tip surface of the part, and the switch or the switch is operated (turned on) when the piston or other object of the syringe contacts the operating body during the preparation operation. Can be detected. Alternatively, a strain gauge is installed on the front end surface of the piston pressing portion, and the object on the front end surface of the piston pressing portion is changed by the output change of the strain gauge caused by the piston or other object of the syringe coming into contact with the front end surface of the piston pressing portion. What detects detection can also be used.

Furthermore, as another example of the safety device for the piston drive mechanism, when an object comes into contact with the piston pressing portion and the piston pressing portion is further advanced in this state, it acts on a motor that drives the piston driving mechanism. It is also possible to use a system that utilizes the increase in load. Examples of such a system include a system that detects the contact of an object with the tip surface of the piston pressing portion based on a change in the current flowing through the motor, or a piston pressing that is based on a change in the rotational speed of the motor. And the like that detect the contact of an object with the tip surface of the part. In order to detect the contact of the object with the tip surface of the piston pressing portion by detecting the contact of the object with the tip surface of the piston pressing portion based on the change in the motor current or the rotational speed in this way. Since no switch or the like is required, the structure can be simplified.

The safety device for these piston drive mechanisms may stop the advancement of the piston pressing part immediately after detecting the contact of the object with the tip surface of the piston pressing part, or after detecting the contact, You may make it move forward a little and make it move back by the advancement.

The present invention is particularly effective when a syringe without a data carrier is used. Of course, as shown in FIG. 7, a data carrier 230 such as an IC tag (for example, an RFID tag) is mounted. The present invention is also effective in a chemical injection device that uses a syringe 200 and includes a reader 160 that can read data recorded on the data carrier 230. The reader 160 can read the data carrier 230 when the syringe 200 is normally attached to the injection head 101, for example, after the injection head 110 attaches the syringe 200 to a predetermined position of the injection head 110. In the case of a structure that is normally held by being rotated by 90 degrees, it is preferably mounted at a position facing the data carrier 230 in a state of being rotated by 90 degrees.

For the data carrier, the manufacturer, type of chemical solution, product number, components (particularly if the drug solution is a contrast medium, iodine concentration, etc.), filling amount, lot number, expiry date, etc. In addition to various data, data such as a unique identification number such as a manufacturer and product number, a pressure resistance value, a syringe capacity, a piston stroke, dimensions of necessary parts, and a lot number are recorded. The chemical injection device reads the data recorded on the data carrier by the reader, and based on the read data, determines the distance from the piston pressing portion to the piston end based on the piston end position and further the piston pressing portion position. Can be sought. Accordingly, in the preparation operation, the chemical injection device advances the piston pressing portion while comparing the piston end position obtained based on the data read from the data carrier and the distance to the piston end detected by the detector. Thus, the operation of the piston pressing portion can be controlled with higher accuracy.

In the present invention, when units such as an injection head, an injection control unit, and a second display device that constitute the chemical liquid injection device are wirelessly connected, they can be relayed by a wireless relay box (including AC power supply). . The wireless relay box may or may not have a wireless communication control function for each unit. The wireless relay box may be installed in the examination room, in the operation room, or in both the examination room and the operation room. There is a case where a signal is wirelessly transmitted from a wireless relay box installed in the examination room to an injection control unit installed in the operation room. The chemical injection device further includes an operation remote controller that controls the start and stop of the operation of the piston drive mechanism, and the operation remote controller operates and stops the piston drive mechanism using wireless communication via the wireless relay box. You can also

Furthermore, as a chemical solution injection device to which the present invention can be applied, there is a device in which an injection control unit and an injection head are integrated. Such an integrated chemical injection device is installed in an examination room, and the operation can be controlled from the operation room using the operation remote controller.

DESCRIPTION OF SYMBOLS 100 Chemical liquid injection apparatus 101 Injection control unit 110 Injection head 120 Casing 130 Piston drive mechanism 131 Piston press part 132 Proximity sensor 141 Control part 142 Input device 143 Display device 144 Motor control part 145 Motor 200 Syringe 210 Cylinder 220 Piston 250 Extension tube 300 See through Imaging device 301 Scanner 302 Imaging control unit 1000 Image diagnostic system A151 Second display device

Claims

A syringe holding unit that detachably holds a syringe having a cylinder and a piston inserted into the cylinder so as to be movable back and forth;
A piston drive mechanism having a piston pressing portion operated to press the end of the piston, at least for advancing the piston of the syringe held by the syringe holding portion;
Have
The operation of the piston drive mechanism is controlled such that the moving speed of the piston pressing portion decreases in the last predetermined section of the preparatory operation for moving the piston pressing portion from the initial position to a position where it abuts against the end of the piston. A chemical injection device,
A detector arranged to detect a distance between the piston and the piston pressing portion;
A chemical liquid injector configured to control an operation of the piston pressing portion in the preparatory operation based on a detection result by the detector.
The chemical injection device according to claim 1, wherein the detector is capable of detecting a distance between the detector and an object in a forward direction of the piston pressing portion during the preparation operation.
During the preparatory operation, detection by the detector is performed,
3. The chemical solution injection device according to claim 1, wherein when the distance detected by the detector is equal to or less than a predetermined distance, the operation of the piston pressing portion is controlled such that the moving speed of the piston pressing portion is decreased.
4. The chemical injection device according to claim 3, wherein the operation of the piston pressing portion is controlled so that the forward movement of the piston pressing portion stops at a position where the distance detected by the detector becomes zero.
A device for manually operating the movement of the piston pressing portion;
The operation of the piston pressing part is controlled so that the forward movement of the piston pressing part stops at a position where the distance detected by the detector becomes a second distance smaller than the predetermined distance. Chemical injection device.
A device for manually operating the movement of the piston pressing portion;
The chemical detector according to claim 3, wherein the detector has a distance detectable range of 10 mm or less, and the piston pressing portion stops moving forward when the detector detects an object.
The chemical solution injection device according to any one of claims 1 to 6, wherein the detector is a proximity sensor provided in the piston pressing portion.
The chemical solution injector according to claim 7, wherein the proximity sensor is an optical proximity sensor.