JP2004187849A - Medical solution feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical solution feeder capable of achieving both the easiness in attaching/detaching a medical solution syringe and the firmness of holding the syringe. <P>SOLUTION: Movable holder members 125 are pivotally supported to be rotatable on both left and right sides of the top surface of an immovable holder member 124, and recess grooves are formed on the inner surfaces of the movable holder members 125 and the immovable holder member 124 for holding a cylinder flange 203 of the medical solution syringe 200. When the cylinder flange 203 of the medical solution syringe 200 is inserted into the recess grooves of the pair of released movable holder members 125 from above and the movable holder members 125 are closed, the cylinder flange 203 is held by the recess grooves of the movable holder members 125 and the immovable holder member 124. Since the movable holder members 125 are rotatable, the medical solution syringe 200 can be easily attached/detached, and since the immovable holder member 124 is fixed, the medical solution syringe 200 can be firmly held. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drug solution injector to which a drug syringe for injecting a drug solution into a subject is detachably mounted, and more particularly to a drug solution injector that holds a cylinder member of the drug syringe with a cylinder flange.
[0002]
[Prior art]
Currently, there are CT (Computed Tomography) scanners, MRI (Magnetic Resonance Imaging) devices, PET (Positive Emission Tomography) devices, and the like as medical devices that capture tomographic images of a subject. , An angio apparatus, an MRA (MR Angio) apparatus, and the like.
[0003]
When the above-described apparatus is used, a liquid medicine such as a contrast medium or a physiological saline may be injected into a subject, and a liquid medicine injection apparatus that automatically executes the injection has been put to practical use. The above-described liquid injector has an injection head, and a liquid syringe is detachably mounted on the injection head.
[0004]
The drug solution syringe has a cylindrical cylinder member filled with a drug solution, and a cylindrical piston member is slidably inserted into the cylinder member. Generally, an annular cylinder flange is formed on the outer periphery of the rear end of the cylinder member, and an annular piston flange is formed on the outer periphery of the rear end of the piston member.
[0005]
When using the liquid injector, the cylinder member of the liquid syringe filled with the liquid is connected to the subject with an extension tube, and the liquid syringe is mounted on the syringe holding member of the liquid injector. In a general liquid injector, a concave portion having a shape corresponding to the cylinder member and the cylinder flange of the liquid syringe is formed on the upper surface of the syringe holding member. If the cylinder member and the cylinder flange are loaded into this concave portion, the liquid syringe can be used. Will be retained.
[0006]
Further, in the liquid injector, the piston flange is held separately from the cylinder member by a piston drive mechanism, and the piston member is slid by the piston drive mechanism. With this, the medical solution is injected into the subject from the medical solution syringe, and if necessary, for example, the medical solution is sucked from the chemical solution tank into the medical solution syringe.
[0007]
In addition, the piston member of the liquid syringe as described above generally has a structure in which a piston head is attached to the front end of a piston rod having a piston flange formed on the outer periphery of the rear end. Some liquid syringes have formed.
[0008]
In a drug solution injector corresponding to such a drug solution syringe, a piston driving mechanism slidably supports a slide rod having a chuck mechanism formed at a front end, and the piston mechanism is held by the slide rod chuck mechanism to hold a piston member. Slide inside the member.
[0009]
In addition, in the above-described drug solution injection device, there is a product in which a drug solution syringe is directly mounted as described above, and a product in which a drug solution syringe is mounted via a cylinder adapter. There are various types of such cylinder adapters. For example, an adapter for preventing breakage due to the internal pressure of a chemical syringe is formed of a thick polycarbonate so as to cover the entire cylinder member.
[0010]
In such a cylinder adapter, an annular adapter flange is formed on the outer periphery of the rear end, and a concave portion with which the cylinder flange is engaged is formed inside the rear surface of the adapter flange. Therefore, the drug solution injector indirectly holds the cylinder flange by holding the adapter flange of the cylinder adapter loaded with the cylinder member.
[0011]
Some of the above-described liquid injectors have a pair of flange holding members rotatably supported in order to hold a cylinder flange of a liquid syringe. In such a liquid injector, the flange holding member has an arc-shaped concave groove on the inner surface of which the cylinder flange is detachable, and is disposed at a position for holding the cylinder flange from both left and right sides.
[0012]
Such a flange holding member is rotatably supported by an open position in which the cylinder flange is inserted upward and is openable, and a closed position in which the cylinder flange is held from both left and right sides. For this reason, when the cylinder flange is inserted into the flange holding member arranged at the open position and rotated to the closed position, the cylinder flange is held from both left and right sides by the pair of flange holding members (for example, see Patent Document 1). 1).
[0013]
[Patent Document 1]
JP-A-2002-11096
[Problems to be solved by the invention]
In the above liquid injector, in order to easily and detachably hold the cylinder flange of the liquid syringe, the cylinder flange is held from both right and left sides by a rotatable flange holding member.
[0015]
However, when a medical solution is injected into the subject from a medical solution syringe at a high pressure, the stress acting on the flange holding member from the cylinder flange becomes excessive. In such a case, there is a concern that the flange holding member pivotally supported as described above may be broken due to insufficient strength.
[0016]
The present invention has been made in view of the above-described problems, and has as its object to provide a liquid injector that has a sufficient strength to hold the cylinder flange while easily attaching and detaching the cylinder flange.
[0017]
[Means for Solving the Problems]
The liquid injector according to the present invention is configured such that at least a cylinder member and a piston member of a liquid syringe in which a piston member is slidably inserted into a cylindrical cylinder member having an annular cylinder flange formed on the outer periphery of a rear end. The liquid injector is a liquid injector that is held at a fixed position and relatively moved, and includes an immovable holding member, a pair of movable holding members, a member shaft support mechanism, and a member holding mechanism.
[0018]
An arc-shaped concave groove is formed on the upper surface of the immobile holding member, and a lower portion of the cylinder flange is removably inserted into the concave groove. The pair of movable holding members are arranged one by one on both the left and right sides of the upper surface of the immobile holding member, and have an arc-shaped groove communicating with the groove of the immovable holding member. The member supporting mechanism rotatably supports the pair of movable holding members in a vertically rotatable manner. The member holding mechanism opens the movable holding member rotatably supported in the up and down direction upward. The cylinder flange is selectively held at an open position where the cylinder flange can be inserted and a closed position where the cylinder flange is held from both left and right sides.
[0019]
Therefore, in the liquid injector according to the present invention, when the cylinder flange of the liquid syringe is inserted into the concave groove of the pair of movable holding members disposed at the open position from above and the movable holding member is rotated to the closed position, the movable holding member is moved. The cylinder flange is held by the concave groove between the member and the immovable holding member. Since the movable holding member is rotatably supported on the shaft, the liquid syringe can be easily attached and detached. Since the immovable holding member is fixed, the liquid syringe can be held with sufficient strength.
[0020]
The various components referred to in the present invention do not need to exist independently of each other. For example, a plurality of components are formed as one member, and one component is used as another component. It is possible that some of them are a part, some of the components overlap with some of the other components, and the like.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, the directions of front, rear, left, right, up and down are defined as shown in the drawings. However, this is defined for the sake of convenience in order to simplify the description of the relative relationship of each part, The direction at the time of manufacture and use is not limited.
[0022]
[Configuration of Embodiment]
As shown in FIG. 3, the liquid injector 100 according to the present embodiment has an operation panel 102 and a liquid crystal display 103 arranged on the upper surface of an apparatus main body 101, and is injected into the side of the apparatus main body 101 by a movable arm 104. The head 110 is mounted. As shown in FIG. 2, the injection head 110 has a semi-cylindrical groove-shaped recess 112 formed on the upper surface of a head main body 111, and a chemical syringe 200 is detachably mounted in the recess 112.
[0023]
The chemical syringe 200 includes a cylinder member 201 and a piston member 202, and the piston member 202 is slidably inserted into the cylinder member 201. A cylinder flange 203 is formed around the rear end of the cylinder member 201, and a piston flange 204 is formed around the rear end of the piston member 202.
[0024]
The injection head 110 has a piston drive mechanism 113 disposed behind the concave portion 112 of the head main body 111, and the piston drive mechanism 113 holds the piston flange 204 and moves it back and forth. Further, the injection head 110 has a pair of flange holding mechanisms 120 mounted at predetermined positions of the concave portion 112 of the head main body 111, and holds the cylinder flange 203 of the chemical syringe 200 with the flange holding mechanism 120.
[0025]
More specifically, as shown in FIGS. 5 and 6, the flange holding mechanism 120 has a flat holding guide member 121, and the holding guide member 121 is integrally fixed to the head main body 111. . A U-shaped recess 122 is formed on the upper surface of the holding guide member 121, and the cylinder member 201 of the chemical syringe 200 is loaded into the recess 122 from above.
[0026]
An immovable holding member 124 is integrally fixed below the rear surface of the holding guide member 121, and a pair of movable holding members 125 are rotatably supported one by one on both left and right sides above the rear surface. The immobile holding member 124 has an upper surface formed in an arc shape corresponding to the outer peripheral surface of the cylinder member 201, and an arc-shaped concave groove 126 into which a lower portion of the cylinder flange 203 is removably inserted is formed on the upper surface. ing.
[0027]
The inner surfaces of the pair of movable holding members 125 are formed in an arc shape corresponding to the outer peripheral surface of the cylinder member 201, and an arc-shaped concave groove 127 with which the upper part of the cylinder flange 203 is engaged is formed on the inner surface. The immovable / movable holding members 124 and 125 are formed such that all the inner surfaces of the concave grooves 126 and 127 communicate with each other at the same level. In particular, the concave grooves 126 and 127 with which the front surface of the cylinder flange 203 abuts. The rear surface is formed to be even with high precision.
[0028]
The pair of movable holding members 125 are rotatably supported in the vertical direction by a support shaft 129 which is a member shaft support mechanism, with the front surfaces thereof abutting against the rear surface of the holding guide member 121. A member holding mechanism (not shown) for holding the moving position is formed.
[0029]
More specifically, as shown in FIG. 5, an opening 131 is formed in the front surface of the movable holding member 125, and a ball bearing 133, which is a spherical member, is pressed into the opening 131 along with the coil spring 132. I have. Also, as shown in FIG. 6B, first and second concave holes 134 and 135 are formed on the left and right sides above the rear surface of the holding guide member 121 in order from the outside. The ball bearing 133 of the movable holding member 125 is elastically engaged with the second concave holes 134 and 135 by the bias of the coil spring 132.
[0030]
When the ball bearing 133 is engaged with the first concave hole 134 of the holding guide member 121, the pair of movable holding members 125 are opened upward as shown in FIG. When held in the open position where it can be inserted and engaged with the second concave hole 134, as shown in FIG. 1C, it is held in the closed position where the cylinder flange 203 is held from both left and right sides.
[0031]
When the movable holding member 125 is disposed at the closed position, the lower end is formed below the axis of the support shaft 129 and the upper end is formed above the axis of the support shaft 129. A lever 136 that is manually operated is integrally formed at the upper end.
[0032]
In addition, as shown in FIG. 4, the liquid injector 100 of the present embodiment is used, for example, near the imaging unit 301 of the MRI apparatus 300 and is connected to the control unit 302 of the MRI apparatus 300 as necessary. The control unit 302 includes a computer system, controls the operation of the imaging unit 301, and displays a tomographic image.
[0033]
[Operation of Embodiment]
In the above-described configuration, when using the liquid injector 100 according to the present embodiment, for example, an operator selects an appropriate liquid syringe 200 corresponding to the liquid to be injected into the subject, and uses the liquid syringe 200 as an MRI. An extension tube is connected to a subject located at the imaging unit 301 of the apparatus 300 (not shown).
[0034]
In the state where the liquid syringe 200 is not mounted on the injection head 110, the liquid injector 100 engages the ball bearing 133 of the movable holding member 125 with the first concave hole 135 of the holding guide member 121. As shown in (a), the movable holding member 125 is held at the open position.
[0035]
Then, when the operator inserts the cylinder flange 203 of the liquid syringe 200 into the concave groove 126 of the pair of movable holding members 125 held at the open position and presses the same downward, as shown in FIG. When the movable holding member 125 is pressed by the cylinder member 201 and the cylinder flange 203 and rotates, the ball bearing 133 falls out of the first concave hole 135.
[0036]
Further, when the operator presses the liquid syringe 200 downward, the movable holding member 125 is rotated by being pressed by the cylinder member 201 and the cylinder flange 203, so that the ball bearing 133 is engaged with the second concave hole 135. Then, as shown in FIG. 1C, the movable holding member 125 is held at the closed position.
[0037]
Then, in the liquid syringe 200, the upper part of the cylinder flange 203 is held by the pair of movable holding members 125 from both sides, and the lower part is held by the immovable holding member 124. When the movable holding member 125 is difficult to rotate simply by pressing the liquid syringe 200 downward as described above, the movable holding member 125 can be closed by manual operation of the lever portion 136 as desired.
[0038]
At this time, since the piston driving mechanism 113 holds the piston flange 204 of the liquid syringe 200, when the operator performs a predetermined operation on the operation panel 102 of the liquid injector 100, the piston driving mechanism 113 slides the piston member 202. As a result, the drug solution is injected from the cylinder member 201 to the subject.
[0039]
When the injection operation is completed, for example, the operator removes the extension tube from the subject and pulls out the liquid syringe 200 from the injection head 110 upward. Then, the movable holding member 125 is pressed by the cylinder member 201 and the cylinder flange 203 and rotated, whereby the ball bearing 133 falls off from the second concave hole 135.
[0040]
Further, when the operator lifts the chemical syringe 200 upward, as shown in FIG. 1B, the movable holding member 125 is rotated by being pressed by the cylinder member 201 and the cylinder flange 203, and the ball bearing 133 is moved. It engages with the first concave hole 135.
[0041]
As shown in FIG. 1A, the movable holding member 125 is now held at the open position, so that the liquid syringe 200 is taken out upward. If the movable holding member 125 is difficult to rotate simply by pulling the liquid syringe 200 upward as described above, the movable holding member 125 can be opened by manual operation of the lever 136 as desired.
[0042]
In the state where the liquid syringe 200 is not mounted on the liquid injector 100 as described above, the movable holding member 125 is held at the open position as described above, so that the liquid syringe 200 does not require a special preparation operation or the like. 200 can begin to be mounted.
[0043]
[Effects of Embodiment]
In the liquid injector 100 according to the present embodiment, the movable holding member 125 is rotatably supported in the vertical direction as described above, and the lower end disposed at the closed position is located below the axis of the support shaft 129. It is formed in a shape that is positioned and the upper end is positioned upward.
[0044]
Therefore, when the liquid syringe 200 is inserted into the recess 112 of the injection head 110 from above by manual operation, the cylinder flange 203 is automatically held by the pair of movable holding members 125, and from this state, the liquid syringe 200 is moved upward by manual operation. When pulled out, the pair of movable holding members 125 are automatically opened.
[0045]
Therefore, in the liquid injector 100 of the present embodiment, the liquid syringe 200 can be easily and reliably attached to and detached from the injection head 110 even with one hand, so that the liquid injector 100 causing contamination at the medical site can be operated with only one hand. And the other hand can be kept clean at all times.
[0046]
Moreover, if the movable holding member 125 is made openable and closable for facilitating the attachment and detachment of the liquid syringe 200 as described above, the mechanical strength of the movable liquid holding member 125 is inevitably reduced. The lower part of the cylinder flange 203 is held by the immovable holding member 124 fixed to the cylinder flange 203.
[0047]
For this reason, the chemical syringe 200 can be firmly held, and the mechanical strength of the flange holding mechanism 120 does not become insufficient even when the piston member 202 is pressed to a high pressure. That is, the liquid injector 100 of this embodiment uses the movable holding member 125 and the immovable holding member 124 in combination to achieve both easy attachment and detachment of the liquid syringe 200 and strong holding.
[0048]
In particular, in the liquid injector 100 of the present embodiment, the holding guide member 121 in which the support shaft 129 that supports the movable holding member 125 and the concave holes 134 and 135 in which the ball bearing 133 of the movable holding member 125 engages is formed. And the immobile holding member 124 are integrally fixed, so that a strong structure is easily realized.
[0049]
Moreover, in the liquid injector 100 of the present embodiment, the holding guide member 121 is formed in a flat plate shape, and a U-shaped recess 122 in which the cylinder member 201 is located is formed on the upper surface. The front surface of the movable holding member 125 is in contact.
[0050]
For this reason, even if a stress that presses the piston member 202 to a high pressure acts on the movable holding member 125 from the cylinder flange 203, the movable holding member 125 can be held by the holding guide member 121, and the rotatable movable holding member can be held. The member 125 can also hold the cylinder flange 203 firmly.
[0051]
In addition, since the immovable / movable holding members 124 and 125 are formed so that the rear surfaces of the concave grooves 126 and 127 with which the front surfaces of the cylinder flanges 203 abut with high precision are flush with each other, the chemical syringe pressed forward. 200 can be firmly held with good accuracy.
[0052]
Further, in the liquid injector 100 of the present embodiment, since the manually operated lever portion 136 is integrally formed at the upper end of the movable holding member 125, the movable holding member 125 is rotated only by moving the liquid syringe 200 up and down. If it is difficult, the movable holding member 125 can be opened and closed by manual operation of the lever portion 136 as desired, and the movable holding member 125 can be reliably opened and closed.
[0053]
In the liquid injector 100 of this embodiment, the ball bearing 133 press-fit into the opening 131 of the movable holding member 125 together with the coil spring 132 engages with the first / second concave holes 134 and 135 of the holding guide member 121. By the combination, a member holding mechanism for holding the movable holding member 125 at the open position and the closed position is realized with a simple structure.
[0054]
[Modification of Embodiment]
The present invention is not limited to the present embodiment, and allows various modifications without departing from the gist thereof. For example, in the above-described embodiment, the immovable holding member 124, the support shaft 129, and the holding guide member 121 are illustrated as being formed separately and integrally mounted, but a part or all of them are integrally formed. It is also possible.
[0055]
For example, as shown in FIG. 7, by integrally forming the immovable holding member 124 and the holding guide member 121, the mechanical strength of the immovable holding member 124 is improved, and when the liquid syringe 200 is pressed forward. Since the positional accuracy between the movable holding member 125 and the immovable holding member 124 can be improved, the liquid syringe 200 can be held more firmly.
[0056]
In the above embodiment, the ball bearing 133 is press-fitted together with the coil spring 132 into the opening 131 of the movable holding member 125, and the holding guide member 121 is formed with first and second concave holes 134 and 135. Illustrated. However, it is also possible to form the opening hole 131 in the holding guide member 121, press-fit the ball bearing 133 together with the coil spring 132, and form the first and second concave holes 134 and 135 in the movable holding member 125.
[0057]
Alternatively, a convex portion that engages with the first / second concave hole 134, 135 of the holding guide member 121 is formed in the movable holding member 125, or the first / second concave hole 134, 135 is formed in the movable holding member 125. It is also possible to form a convex portion on the holding guide member 121 and to press the movable holding member 125 against the holding guide member 121 with a coil spring or the like.
[0058]
Further, in the above-described embodiment, it is assumed that the liquid injector 100 is used in the vicinity of the MRI apparatus 300, but it is also possible to use this in the vicinity of a CT scanner, a PET apparatus, an angiography apparatus, an MRA apparatus, and the like. Further, in the above-described embodiment, one chemical liquid syringe 200 is mounted in one concave portion 112 of the liquid injector 100, but a plurality of liquid syringes 200 can be mounted in plural concave portions of the injection head. (Not shown).
[0059]
Further, in the above embodiment, the liquid syringe 200 is directly attached to the liquid injector 100. However, since there are various sizes in the liquid syringe 200 currently on the market, for example, the liquid syringe 200 having the largest size is used. Only the liquid syringes 200 of various sizes other than the maximum are directly mounted on the liquid injector 100, and may be mounted on the liquid injector 100 via dedicated cylinder adapters (not shown). .
[0060]
In particular, in the drug solution injector 100 that injects a drug solution at a high pressure, a cylinder adapter for loading the entire cylinder member 201 is used to prevent the cylinder member 201 of the drug solution syringe 200 from being broken. Such a cylinder adapter is formed in a cylindrical shape in which the cylinder member 201 is detachably mounted from the rear end, and an annular adapter flange is formed on the outer periphery of the rear end.
[0061]
Since a concave portion in which the cylinder flange 203 of the liquid syringe 200 is detachably engaged is formed on the inner side of the rear surface of the adapter flange, when the liquid syringe 200 with such a cylinder adapter is mounted on the liquid injector 100. The immovable holding member 124 and the pair of movable holding members 125 hold the cylinder flange 203 indirectly by directly holding the adapter flange.
[0062]
In the above-described embodiment, the rod-shaped piston member 202 is inserted into the cylinder member 201 of the liquid syringe 200. However, such a liquid syringe has a product in which the piston member has only the head portion (see FIG. 1). Zu). In particular, as described above, in a drug solution syringe in which a drug solution is injected at a high pressure, the piston member is only the head portion as described above in order to prevent breakage of the rod portion.
[0063]
In a liquid injector using such a liquid syringe (not shown), a piston drive mechanism grips and slides the piston head of the liquid syringe with a strong metal slide arm or the like. The flange holding mechanism 120 of the above-described embodiment can be used for the apparatus.
[0064]
【The invention's effect】
In the liquid injector according to the present invention, when the cylinder flange of the liquid syringe is inserted into the concave groove of the pair of movable holding members arranged at the open position from above, and the movable holding member is rotated to the closed position, the movable holding member and By holding the cylinder flange in the concave groove with the immovable holding member, the movable holding member is rotatably supported on the shaft, so that the liquid syringe can be easily attached and detached, and the immovable holding member is fixed. Therefore, the liquid syringe can be held with sufficient strength.
[Brief description of the drawings]
FIG. 1 is a front view showing a state in which a liquid syringe is attached to and detached from a movable holding member and an immovable holding member of the liquid injector in the embodiment of the present invention.
FIG. 2 is a perspective view showing a state in which a liquid syringe is attached to and detached from an injection head of the liquid injector.
FIG. 3 is a perspective view showing an appearance of a drug solution injection device.
FIG. 4 is a perspective view showing an appearance of the MRI apparatus.
FIG. 5 is an exploded perspective view showing an assembly structure of the flange holding mechanism.
FIG. 6 is a perspective view showing a structure of a flange holding mechanism.
FIG. 7 is an exploded perspective view showing an assembly structure of a flange holding mechanism according to a modification.
[Explanation of symbols]
Reference Signs List 100 Chemical injection device 113 Piston drive mechanism 121 Holding guide member 122 Depression 124 Immobile holding member 125 Movable holding member 126, 127 Depressed groove 129 Support shaft 131 serving as member support mechanism Opening hole 132 Coil spring 133 Ball bearing 134 First recess Hole 135 Second concave hole 136 Lever section 200 Chemical solution syringe 201 Cylinder member 202 Piston member 203 Cylinder flange 204 Piston flange

Claims (8)

Relative movement of a chemical syringe in which a piston member is slidably inserted into a cylindrical cylinder member having an annular cylinder flange formed on the outer periphery of a rear end, at least the cylinder flange and the piston member are held separately. A liquid injector for causing
An immovable holding member in which a lower part of the cylinder flange is formed on an upper surface with a detachable arc-shaped concave groove,
A pair of movable holding members arranged one by one on each of the left and right sides of the upper surface of the immovable holding member and formed with an arc-shaped concave groove communicating with the concave groove;
A member shaft support mechanism that rotatably supports the pair of movable holding members in a vertically rotatable manner,
The movable holding member rotatably supported in the vertical direction is opened upward and selectively held at an open position where the cylinder flange can be inserted and a closed position where the cylinder flange is held from both left and right sides. A member holding mechanism,
A liquid injector. 2. The liquid injector according to claim 1, wherein a lower end of the movable holding member disposed at the closed position is located below an axis of the member supporting mechanism, and an upper end is located above. 3. The liquid injector according to claim 1, wherein a manually operated lever portion is integrally formed at an upper end of the movable holding member. The member holding mechanism,
A spherical member press-fit together with a coil spring into an opening formed in at least one of the front surface and the rear surface of the movable holding member;
The first concave hole in which the spherical member of the movable holding member disposed in the open position is removably engaged and the spherical member of the movable holding member disposed in the closed position are detachably engaged. A holding guide member formed with a second concave hole to be fitted;
The drug solution injector according to any one of claims 1 to 3, further comprising: The liquid injector according to claim 4, wherein the immovable holding member, the member supporting mechanism, and the holding guide member are integrally fixed. 5. The liquid injector according to claim 4, wherein the immovable holding member and the holding guide member are integrally formed. The holding guide member is formed in a flat plate shape having a U-shaped concave portion formed on an upper surface in which a cylinder member of the liquid syringe is loaded from above,
The liquid injector according to claim 4, wherein a rear surface of the holding guide member is in contact with a front surface of the movable holding member. An annular adapter flange formed on the inside of the rear surface with a concave portion with which the cylinder flange of the liquid syringe is detachably engaged is formed on the outer periphery of the rear end, and the cylinder member is detachably loaded from the rear end. A cylindrical cylinder adapter,
8. The cylinder flange is indirectly held by holding an adapter flange of the cylinder adapter loaded with the cylinder member by the immovable holding member and the pair of movable holding members. A liquid injector according to the above,
A chemical solution injection system.

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