JP2004243009A - Medical solution injection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical solution injection apparatus easily attaching/detaching a medical solution syringe with a single hand. <P>SOLUTION: When a syringe flange 203 of the medical solution syringe 200 is inserted into a movable retention member 125 disposed in an open position, from the upper part, the movable retention member 125 is displaced to the closed position by its pushing pressure. A slide link member 134 lowered associated therewith is locked by an energized closure retention member 136, so that the medical solution syringe 200 is fixedly retained. When the lock of the closure retention member 136 is released from this state by a manual operation, the energized slide link member 134 is raised to displace the movable retention member 125 to the open position, so that the medical solution syringe 200 can be taken out upward. <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. 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.
[0003]
The above-described liquid injector has an injection head, and a liquid syringe is detachably mounted on the injection head. 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.
[0004]
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, so that the liquid syringe can be inserted by inserting the cylinder member and the cylinder flange into the concave portion. Will be retained.
[0005]
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.
[0006]
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.
[0007]
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.
[0008]
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.
[0009]
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.
[0010]
Some of the above-described liquid injectors have a pair of movable holding members rotatably supported in order to hold a cylinder flange of a liquid syringe. In such a liquid injector, the movable holding member has an arc-shaped concave groove on the inner surface of which the cylinder flange is detachable, and is arranged at a position for holding the cylinder flange from both left and right sides.
[0011]
Such a movable holding member is rotatably supported at an open position in which the cylinder flange is inserted upward and open, 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 movable 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 movable holding members (for example, see Patent Document 1). 1).
[0012]
[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 left and right sides by a rotatable movable holding member.
[0014]
However, in this case, a two-stage operation is required to attach / detach the liquid syringe to / from the liquid injector, and it is difficult to attach / detach the liquid syringe to / from the liquid injector with one hand. As described above, a drug solution injector is used in a medical field, but in a medical field, it is required to keep one hand clean at all times, and it is important to be able to operate a drug solution injector that causes contamination with only one hand. .
[0015]
Further, when a medical solution is injected into the subject from the medical solution syringe at a high pressure, the stress acting on the movable holding member from the cylinder flange becomes excessive. In such a case, there is a concern that the movable 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]
According to a first aspect of the present invention, there is provided a chemical solution injector, wherein a piston member is slidably inserted into a cylindrical cylinder member having an annular cylinder flange formed on an outer periphery of a rear end thereof. Is a liquid injector that separately holds and moves relative to each other, and includes a pair of movable holding members, a holding biasing mechanism, a slide link member, and a holding lock mechanism.
[0018]
The movable holding member is formed in a circular arc shape, and each of the shafts is rotatably opened between an open position where the cylinder flange is freely inserted and a closed position where the cylinder flange is held from both sides orthogonal to the axial direction. Supported. The holding urging mechanism urges the pair of movable holding members from the open position to the closed position, and the slide link member is slidably supported in the up and down direction and is pivotally moved by the pair of movable holding members from the axis of rotation. The engagement is at the inner position, and the holding lock mechanism removably locks the slide link member when the movable holding member is located at the closed position.
[0019]
Further, in the second liquid injector according to the present invention, the holding urging mechanism urges the slide link member upward, and the holding lock mechanism allows the movable holding member arranged at the closed position to be freely disengaged. Lock.
[0020]
Therefore, in the liquid injector according to the present invention, when the holding lock mechanism does not lock the slide link member, the movable holding member is disposed at the open position by the urging of the holding urging mechanism. A cylinder flange is inserted from above. When the movable holding member is displaced from the open position to the closed position against the urging of the holding urging mechanism due to pressing by the cylinder flange or the like, the movable holding member is locked by the holding lock mechanism, so that the cylinder flange of the liquid syringe can be securely held. Is held. When the lock by the holding lock mechanism is released, the movable holding member is displaced from the closed position to the open position by the urging of the holding urging mechanism, and the cylinder flange of the liquid syringe held there is released upward. .
[0021]
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.
[0022]
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.
[0023]
[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.
[0024]
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.
[0025]
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.
[0026]
More specifically, as shown in FIGS. 5 and 6, the flange holding mechanism 120 has plate-shaped first / second guide members 121 and 122, and the second guide member 121 and 122 are provided on the front surface of the first guide member 121. The guide member 122 is integrally mounted. The first / second guide members 121 and 122 have a U-shaped recess 123 formed on the upper surface, and the cylinder member 201 of the chemical syringe 200 is inserted into the recess 123 from above.
[0027]
An immobile holding member 124 is integrally formed on the lower front surface of the first guide member 121, and a pair of movable holding members 125 are rotatably supported one by one above and below the immobile holding member 124. Have been. More specifically, support shafts 126 are integrally formed on the left and right sides of the upper front surface of the first guide member 121, and a pair of movable holding members 125 are rotatably supported by these support shafts 126. I have.
[0028]
The upper surface of the immobile holding member 124 is formed in an arc shape corresponding to the outer peripheral surface of the cylinder member 201, and an arc-shaped concave groove 127 in which the lower portion of the cylinder flange 203 is removably mounted is formed on the upper surface. ing. Each of the pair of movable holding members 125 has an inner surface formed in an arc shape corresponding to the outer peripheral surface of the cylinder member 201, and has an arc-shaped concave groove 128 with which an upper portion of the cylinder flange 203 is engaged.
[0029]
The movable holding member 125 has an engaging pin 131 integrally formed on the front surface at a position inside the support shaft 126, and the engaging pin 131 of the pair of movable holding members 125 is displaceable on the second guide member 122. Are formed on both left and right sides, respectively.
[0030]
Since the rotation range of the movable holding member 125 is regulated by the engagement of the engagement pin 131 with the opening hole 132, the pair of movable holding members 125 are moved upward as shown in FIG. The cylinder flange 203 can be freely displaced between an open position in which the cylinder flange 203 can be inserted and a closed position for holding the cylinder flange 203 from both sides orthogonal to the axial direction, as shown in FIG.
[0031]
Note that the movable holding member 125 is formed in such a shape that the lower end is located below the axis of the support shaft 126 and the upper end is located above when the movable holding member 125 is located at the closed position. When the pair of movable holding members 125 are arranged at the closed position, the upper ends are formed on planes that are in close contact with each other, and the lower ends are formed on a cylindrical surface centered on the axis of the support shaft 126.
[0032]
Further, since both ends of the immovable holding member 124 are also formed on a cylindrical surface that is in close contact with the lower end of the movable holding member 125, when the pair of movable holding members 125 are disposed in the closed position, the pair of movable holding members 125 An annular shape is formed with one immobile holding member 124.
[0033]
As shown in FIGS. 5 and 6, a U-shaped slide link member 134 is slidably supported in the vertical direction in front of the second guide member 122, and is formed at the upper left and right ends of the slide link member 134. The engaging pin 131 of the movable holding member 125 is also engaged with the horizontally elongated opening hole 135.
[0034]
For this reason, the slide link member 134 is engaged with the pair of movable holding members 125 at a position inside the rotation axis, and the opening and closing of the movable holding member 125 and the vertical movement of the slide link member 134 are linked. . A holding urging mechanism (not shown) such as a coil spring is connected to the slide link member 134, and the slide link member 134 is urged upward by the holding urging mechanism. Is biased from the open position to the closed position.
[0035]
Further, a through-hole 135 communicating with the front-rear direction is formed below the first / second guide members 121 and 122, and the closing holding member 136 is slidably inserted into the through-hole 135 in the front-rear direction. . The closing holding member 136 is urged forward by a closing urging mechanism (not shown) such as a coil spring, and the through hole 137 of the slide link member 134 when the movable holding member 125 is located at the closing position. From behind.
[0036]
A manual operation member 138 is connected to the closing holding member 136, and the manual operation member 138 is exposed on the upper surface of the head main body 111 as shown in FIG. When the pair of movable holding members 125 are displaced from the open position to the closed position and the slide link member 134 is lowered, the closed holding members 136 are engaged with the through holes 137 by the urging of the closing urging mechanism.
[0037]
In this state, when the closing and holding member 136 is retracted by the manual operation member 138 and detaches from the slide link member 134, the slide link member 134 is displaced upward by the urging of the holding urging mechanism. A holding lock mechanism for removably locking the slide link member 134 with the closing urging mechanism and the manual operation member 138 is formed.
[0038]
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.
[0039]
[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).
[0040]
As shown in FIG. 2A, in the state where the liquid syringe 200 is not mounted on the injection head 110, the closing device 136 urged forward by the closing urging mechanism is a slide link. The manual operation member 138 which is in contact with the rear surface of the member 134 and is connected to the closing holding member 136 is retracted. In this state, since the slide link member 134 is urged upward by the holding urging mechanism, as shown in FIG. 1A, the pair of movable holding members 125 are arranged at an open position opened upward. I have.
[0041]
Then, when the operator inserts the cylinder flange 203 of the chemical syringe 200 into the concave groove 127 of the pair of movable holding members 125 held at the open position and presses it downward, as shown in FIG. The movable holding member 125 is rotated by being pressed by the cylinder member 201 and the cylinder flange 203, and the slide link member 134 is lowered against the bias.
[0042]
Further, when the operator presses the chemical syringe 200 downward, as shown in FIG. 1C, the movable holding member 125 is rotated by the cylinder member 201 and the cylinder flange 203 to the closed position. As a result, the liquid syringe 200 has the upper portion of the cylinder flange 203 held by the pair of movable holding members 125 from both sides, and the lower portion of the syringe flange 203 is held by the immovable holding member 124.
[0043]
At this time, the through-hole 137 of the slide link member 134 communicates with the through-hole 135 of the first / second guide members 121 and 122, so that the closing holding member 136 urged forward moves forward to move the slide link member 134. , The pair of movable holding members 125 that hold the cylinder flange 203 together with the immovable holding members 124 are locked as described above.
[0044]
At this time, as shown in FIG. 2B, the manual operation member 138 connected to the closing holding member 136 also moves forward, so that the operator confirms that the holding of the liquid syringe 200 is locked by this movement. You.
[0045]
When the liquid syringe 200 is mounted in the recess 112 of the injection head 110 as described above, the piston flange 204 is held by the piston drive mechanism 113. Therefore, when the operator performs a predetermined operation on the operation panel 102 of the liquid injector 100, the piston drive mechanism 113 slides the piston member 202 to inject the liquid medicine from the cylinder member 201 to the subject.
[0046]
When the injection operation is completed, for example, the operator removes the extension tube from the subject and retreats the manual operation member 138 by manual operation. Then, the closing holding member 136 also retreats and separates from the slide link member 134, and as shown in FIG. 1B, the slide link member 134 is displaced upward by urging.
[0047]
As a result, the pair of movable holding members 125 rotate from the closed position to the open position, and as shown in FIG. 1A, the operator takes out the liquid syringe 200 upward. When the movable holding member 125 rotates from the closed position to the open position as described above, the liquid syringe 200 is pushed upward by the lower end of the movable holding member 125, so that the liquid syringe 200 is easily taken out.
[0048]
As described above, in the state in which the drug solution syringe 200 is not mounted on the drug solution injector 100, the movable holding member 125 is held at the open position as described above, so that the above-described operation is performed without requiring any special preparation operation or the like. Thus, mounting of the liquid syringe 200 is started.
[0049]
[Effects of Embodiment]
In the liquid injector 100 of the present embodiment, when the liquid syringe 200 is loaded into the concave portion 106 of the injection head 101 from above by manual operation as described above, the cylinder is formed by the pair of movable holding members 125 and one immovable holding member 124. The flange 203 is held and automatically locked. When the manual operation member 138 is retracted by manual operation from this state, the pair of movable holding members 125 automatically open the cylinder flange 203.
[0050]
For this reason, the liquid syringe 200 can be easily and reliably attached to and detached from the injection head 101 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 is always used. It can be kept clean.
[0051]
In particular, since the movable holding member 125 is formed in a shape in which the lower end is located below the axis of the support shaft 126 when the movable holding member 125 is disposed at the closed position, the pair of the liquid holding syringes 200 are merely pressed by manual operation from above. Is automatically rotated from the open position to the closed position. Moreover, when the movable holding member 125 is displaced from the closed position to the open position, the liquid syringe 200 is pushed upward, so that the liquid syringe 200 can be easily taken out.
[0052]
Further, since the slide link member 134 engaged with the pair of movable holding members 125 inside the rotation axis is urged upward, the pair of movable holding members 125 is opened from the closed position with a simple structure. Position. Moreover, since the slide link member 134 is locked by the one closing holding member 136, the pair of movable holding members 125 arranged at the closing position can be locked with a simple structure.
[0053]
Further, when the pair of movable holding members 125 are displaced from the open position to the closed position so that the closing holding member 136 enters the through hole 137 of the slide link member 134, the manual operation member 138 exposed on the outer surface of the head main body 111. Moves forward, it is possible to reliably and visually confirm that the pair of movable holding members 125 arranged at the closed position are locked.
[0054]
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.
[0055]
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.
[0056]
In particular, in the liquid injector 100 of the present embodiment, the support shaft 126 that supports the movable holding member 125 and the immovable holding member 124 are formed integrally with the first guide member 121, so that an extremely strong structure can be simplified. Has been realized. In addition, since the front surface of the movable holding member 125 is in contact with the rear surface of the second guide member 122, 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, this movable holding member 125 The member 125 can be held by the second guide member 122, and the rotatable movable holding member 125 can firmly hold the cylinder flange 203.
[0057]
Further, since the annular cylinder flange 203 is held by the immovable holding member 124 and the pair of movable holding members 125 from the entire circumferential direction, stress concentration due to partially holding the cylinder flange 203 can be prevented. In addition, the cylinder flange 203 can be firmly held to prevent breakage.
[0058]
Further, since the engaging pin 131 of the movable holding member 125 that engages with the horizontally long opening hole 135 of the slide link member 134 also engages with the arc-shaped opening hole 132 of the second guide member 122, the movable holding member 125 is prevented from rotating to an inappropriate position.
[0059]
[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 embodiment, the immovable holding member 124, the support shaft 126, and the first guide member 121 are illustrated as being integrally formed. However, as shown in FIG. 7, some or all of them are separately formed. It is also possible to form them and fix them together.
[0060]
In addition, the immovable holding member 124 and the support shaft 126 can be formed integrally with the second guide member 122 instead of the first guide member 121 (not shown). It is also possible to form them integrally (not shown). Further, as shown in FIG. 8, the immovable holding member 124 and the first and second guide members 121 and 122 are formed integrally, and the movable holding member 125 is provided with a separate support shaft 126 and an engagement pin 131. It is also possible to attach it.
[0061]
As shown in FIG. 7, when the immobile holding member 124 and the first and second guide members 121 and 122 are all formed separately, the mechanical strength of the completed device is reduced, but the productivity of each part is improved. I do. On the other hand, as shown in FIG. 8, when the immobile holding member 124 and the first and second guide members 121 and 122 are all integrally formed, the productivity of each part is reduced, but the mechanical strength of the completed device is improved. . That is, as shown in FIG. 5, when the immovable holding member 124 is formed integrally with one of the first and second guide members 121 and 122, the productivity of each part and the mechanical strength of the completed device are well balanced. be able to.
[0062]
Further, in the above embodiment, the engagement pin 131 formed on the movable holding member 125 is illustrated as engaging with the opening 135 of the slide link member 134. However, for example, the engagement pin 131 is formed on the slide link member 134. In addition, the opening 135 can be formed in the movable holding member 125.
[0063]
Further, in the above-described embodiment, the pair of movable holding members 125 is easily indirectly and simply biased by biasing one slide link member 134, and the pair of movable holding members 125 are locked by locking one slide link member 134. Although the holding member 125 is simply indirectly locked, the movable holding member 125 can be directly urged or locked.
[0064]
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).
[0065]
In the above-described embodiment, the liquid syringe 200 is directly attached to the liquid injector 100. However, since the liquid syringe 200 currently on the market has various sizes, 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). .
[0066]
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.
[0067]
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.
[0068]
Further, 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 (not shown). 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.
[0069]
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.
[0070]
【The invention's effect】
In the liquid injector according to the present invention, since the movable holding member is arranged at the open position by the urging of the holding urging mechanism when the movable holding member is not locked by the holding lock mechanism, the cylinder flange of the liquid syringe is inserted into the movable holding member from above. When the movable holding member is displaced from the open position to the closed position against the urging of the holding urging mechanism due to pressing by a cylinder flange or the like, the movable holding member is locked by the holding lock mechanism. When the lock by the holding lock mechanism is released, the movable holding member is displaced from the closed position to the open position by the urging of the holding urging mechanism, so that the liquid syringe held there is held. Can be taken out of the cylinder flange, and the medicine syringe can be easily attached and detached with one hand to securely hold it. It is possible to realize the infusion with a simple structure.
[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 first modification.
FIG. 8 is an exploded perspective view showing an assembly structure of a flange holding mechanism according to a second modification.
[Explanation of symbols]
Reference Signs List 100 Chemical injection device 113 Piston drive mechanism 121 First guide member 122 Second guide member 124 Immovable holding member 125 Movable holding member 136 Closed holding member 138 Manual operation member 200 Chemical syringe 201 Cylinder member 202 Piston member 203 Cylinder flange 204 Piston flange

Claims (7)

The cylinder member and the piston member of the 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 the rear end are separately held and relatively moved. A drug solution injector,
A pair of arc-shaped movable retainers rotatably supported at an open position where the cylinder flange is inserted upward and the closed position where the cylinder flange is freely inserted and a closed position where the cylinder flange is retained from both sides perpendicular to the axial direction. Components,
A holding biasing mechanism that biases the pair of movable holding members from the open position to the closed position,
A slide link member which is slidably supported in a vertical direction and is engaged with the pair of movable holding members at a position inside the rotation axis;
A holding lock mechanism for removably locking the slide link member when the movable holding member is arranged at the closed position,
A liquid injector. The cylinder member and the piston member of the 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 the rear end are separately held and relatively moved. A drug solution injector,
A pair of arc-shaped movable retainers rotatably supported at an open position where the cylinder flange is inserted upward and the closed position where the cylinder flange is freely inserted and a closed position where the cylinder flange is retained from both sides perpendicular to the axial direction. Components,
A slide link member which is slidably supported in a vertical direction and is engaged with the pair of movable holding members at a position inside the rotation axis;
A holding biasing mechanism for biasing the slide link member upward;
A holding lock mechanism that removably locks the movable holding member disposed at the closed position,
A liquid injector. The liquid injector according to claim 1, wherein the holding urging mechanism urges the slide link member upward. The holding lock mechanism,
A closing holding member that is supported so as to be displaceable in the front-rear direction and engages with the slide link member when the movable holding member is arranged at the closing position;
A closing biasing mechanism for biasing the closing holding member toward the slide link member,
A manual operation member for detaching the closing holding member from the slide link member in response to a manual operation;
The drug solution injector according to any one of claims 1 to 3, further comprising: The liquid medicine according to any one of claims 1 to 4, wherein a lower end of the movable holding member disposed at the closed position is located below an axis of the rotation, and an upper end is located above. Infusion device. The movable holding member is formed in a shape that holds an upper portion of the cylinder flange,
The liquid injector according to any one of claims 1 to 5, wherein an immobile holding member that holds a lower portion of the cylinder flange is disposed below the pair of movable holding members. 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,
7. 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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