JP2004154238A - Chemical injecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chemical injecting device by which a chemical syringe can be easily attached/detached by one hand. <P>SOLUTION: A holding shaft is press-joined by a shaft press-joining mechanism to the holding arm of a flange holding member 111. By engaging the holding shaft with a first recessed groove of the holding arm, a pair of the flange holding members 111 are opened upward, and are held at an opened position wherein a cylinder flange 203 of a chemical syringe 200 is inserted. By engaging the holding shaft with a second recessed groove of the holding arm, a pair of the flange holding members 111 are held at a closed position wherein the cylinder flange 203 is held from both sides. Therefore, the chemical syringe 200 can be easily attached/detached to/from this chemical injecting device 100, and can be surely held. <P>COPYRIGHT: (C)2004,JPO

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 chemical syringe has a cylinder member filled with a chemical solution, and a piston member is slidably inserted into the cylinder member. Generally, a cylinder flange is formed on the outer periphery of the distal end of the cylinder member, and a piston flange is formed on the outer periphery of the distal 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 slider mechanism, and the piston member is slid by the slider 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]
At present, various proposals have been made for the above-described chemical liquid injection device (for example, see Patent Documents 1 and 2).
[0007]
[Patent Document 1]
JP-A-2002-11096 (page 2-3, FIG. 11-14)
[Patent Document 2]
JP-A-2002-102343 (Page 2-3, FIG. 8)
[0008]
[Problems to be solved by the invention]
In the above-described liquid injector, since the liquid syringe is held by inserting the cylinder member and the cylinder flange into the concave portion of the syringe holding member, the liquid syringe can be easily attached and detached, but this ensures that the liquid syringe is held securely. Is difficult. In order to solve this problem, there has been proposed a chemical liquid injector in which a clamp member that is manually opened and closed is additionally provided on the syringe holding member, and the chemical liquid syringe mounted in the recess of the syringe holding member is securely held by the clamp member.
[0009]
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. .
[0010]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a drug solution injector that can easily and reliably attach and detach a drug solution syringe with one hand without requiring a plurality of steps of operation.
[0011]
[Means for Solving the Problems]
The drug solution injection device of the present invention has a syringe holding member, a flange holding member, a holding arm, an arm shaft support mechanism, a holding shaft, a shaft press-contact mechanism, and separates at least a cylinder flange and a piston flange of the drug solution syringe. Hold and move relatively.
[0012]
The syringe holding member has a concave portion on which the cylinder member is disposed, formed on the upper surface, and the flange holding member is formed in a pair of arcs and has a holding arm projecting outward from each outer peripheral surface. The pair of holding arms have first and second concave grooves formed on the outer surfaces thereof, and are individually rotatably supported by arm support mechanisms. The holding shaft holds the flange holding member in the open position by engaging with the first groove of the holding arm, and holds the flange holding member in the closed position by engaging with the second groove. For this reason, the pair of flange holding members are axially displaceably supported by an open position in which the cylinder flange can be inserted by opening upward and a closed position in which the cylinder flange is held from both sides orthogonal to the axial direction. I have.
[0013]
Therefore, in the liquid injector according to the present invention, the cylinder flange of the liquid syringe is inserted into the pair of flange holding members held at the open position by the holding shaft being engaged with the first concave groove of the holding arm. Is pressed by the cylinder flange, the flange holding member is pressed against the cylinder flange and pivots, so that the holding shaft falls out of the first groove of the holding arm. When the medical fluid syringe is further pressed downward, the cylinder shaft is pressed by the cylinder flange and the flange holding member rotates, whereby the holding shaft engages with the second groove of the holding arm. As a result, the flange holding member is held at the closed position, so that the cylinder flange of the chemical syringe is held.
[0014]
When the liquid syringe is pulled upward from such a state, the flange holding member is pressed by the cylinder flange and rotates, so that the holding shaft falls out of the second concave groove of the holding arm. When the liquid syringe is further pulled upward, the cylinder shaft is pressed by the cylinder flange to rotate the flange holding member, so that the holding shaft is engaged with the first groove of the holding arm. As a result, the flange holding member is held at the open position, and the liquid medicine syringe is taken out upward.
[0015]
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.
[0016]
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 for the sake of simplicity. It does not limit the direction such as time.
[0017]
As shown in FIG. 3, the liquid injector 100 of the present embodiment is formed assuming use in the vicinity of the MRI apparatus 300. As shown in FIG. It is attached to. An operation panel 131 and a liquid crystal display 132 are mounted on an upper surface of the apparatus main body 102, and an injection head 101 is mounted on an side of the apparatus main body 102 by an arm 104.
[0018]
In the injection head 101, as shown in FIG. 1, a semi-cylindrical groove-shaped concave portion 106 is formed on an upper surface of a syringe holding member 105, and a chemical syringe 200 is detachably mounted in the concave portion 106. . 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.
[0019]
A cylinder flange 203 is formed on the outer periphery of the distal end of the cylinder member 201, and a piston flange 204 is formed on the outer periphery of the distal end of the piston member 202. In the injection head 101, a piston drive mechanism 107 is disposed behind the concave portion 106 of the syringe holding member 105, and the piston drive mechanism 107 holds the piston flange 204 and moves it back and forth.
[0020]
The injection head 101 has a pair of flange holding members 111 mounted at predetermined positions of the concave portion 106 of the syringe holding member 105, and holds the cylinder flange 203 of the chemical syringe 200 with the pair of flange holding members 111. More specifically, as shown in FIGS. 4 and 5, the flange holding member 111 is formed in an arc shape corresponding to the cylinder flange 203, and a concave groove 112 into which the cylinder flange 203 is inserted is formed on the inner peripheral surface. Is formed.
[0021]
The pair of flange holding members 111 have a holding arm 114 projecting from the outer peripheral surface thereof. The holding arm 114 is rotatably supported in a vertical direction by a support shaft 115 of an arm shaft support mechanism (not shown). I have. First and second concave grooves 116 and 117 are formed on the outer surface of the holding arm 114, and the holding shaft 119 is pressed against the outer surface of the holding arm 114 by a shaft pressing mechanism 118.
[0022]
As shown in FIG. 5A, when the holding shaft 119 is engaged with the first concave groove 116 of the holding arm 114, the pair of flange holding members 111 are opened upward so that the cylinder flange 203 can be freely inserted. When the holding shaft 119 is engaged with the second concave groove 117 of the holding arm 114 as shown in FIG. 5B, the pair of flange holding members 111 cause the cylinder flange 203 to move to the left and right sides, as shown in FIG. From the closed position.
[0023]
As shown in FIG. 4, the shaft pressure contact mechanism 118 includes a pressure contact guide member 121, a coil spring 122, and a fall prevention member 123, and the holding shaft 119 is slidably supported by the pressure contact guide member 121. More specifically, the press-contact guide member 121 is formed in a vertically long hollow rectangular parallelepiped shape having an open upper surface, and a coil spring 122 is disposed inside the press-contact guide member 121 so as to be vertically expandable and contractible.
[0024]
Narrow slits 125 communicating vertically are formed in front and rear portions of the press-contact guide member 121, and the holding shaft 119 is slidably disposed in the slits 125. Wide slits 126 communicating vertically are also formed in the left and right portions of the press-contact guide member 121, and the holding arms 114 of the flange holding member 111 are displaceably positioned in the slits 126. I have.
[0025]
As described above, the coil spring 122 is disposed inside the press-contact guide member 121, and the holding shaft 119 is urged upward by the coil spring 122. The falling-off prevention member 123 is formed in a plate shape bent in a crank shape, and has a slit 127 communicating with the slit 126 of the press-contact guide member 121.
[0026]
The press-contact guide member 121 is formed integrally with the syringe holding member 111, and the drop-prevention member 123 is attached thereto by a bolt and a nut (not shown). The coil spring 122 and the holding shaft 119 are held.
[0027]
As shown in FIG. 3, the liquid injector 100 of the present embodiment is used, for example, in the vicinity of the imaging unit 301 of the MRI apparatus 300 and is connected to the control unit 302 of the MRI apparatus 300 as needed. The control unit 302 includes a computer system, controls the operation of the imaging unit 301, and displays a tomographic image.
[0028]
[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).
[0029]
In the liquid injector 100, when the liquid syringe 200 is not mounted on the injection head 101, the holding shaft 119 is engaged with the first concave groove 116 of the holding arm 114 as shown in FIG. Thus, the flange holding member 111 is held at the open position.
[0030]
Therefore, as shown in FIGS. 1A and 5A, an operator inserts the cylinder flange 203 of the chemical syringe 200 into the pair of flange holding members 111 held at the open position and presses the cylinder flange 203 downward. Then, the holding shaft 119 is dropped from the first groove 116 of the holding arm 114 by the flange holding member 111 being pressed by the cylinder flange 203 and rotating.
[0031]
Further, when the operator presses the chemical syringe 200 downward, the cylinder holder 203 is pressed to rotate the flange holding member 111, and as shown in FIG. 5B, the holding shaft 119 is moved to the holding arm 114. In the second concave groove 117.
[0032]
As shown in FIG. 1B and FIG. 5B, the flange holding member 111 is now held at the closed position, so that the cylinder flange 203 of the liquid syringe 200 is held. At this time, since the piston driving mechanism 107 holds the piston flange 204 of the liquid syringe 200, when the operator performs a predetermined operation on the operation panel 131 of the liquid injector 100, the piston driving mechanism 107 slides the piston member 202. As a result, the drug solution is injected from the cylinder member 201 to the subject.
[0033]
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 101 upward. Then, the flange holding member 111 is pressed by the cylinder flange 203 and rotates, whereby the holding shaft 119 falls off from the second concave groove 117 of the holding arm 114.
[0034]
Further, when the operator lifts the liquid syringe 200 upward, the flange holding member 111 is rotated by being pressed by the cylinder flange 203, so that the holding shaft 119 is moved to the holding arm 114 as shown in FIG. It engages with the first groove 116.
[0035]
As a result, the flange holding member 111 is held at the open position, and as shown in FIG. 1A, the chemical syringe 200 is taken out upward. As described above, in the state where the chemical syringe 200 is not mounted on the chemical injection device 100, the flange holding member 111 is held at the open position as described above, and therefore, the chemical syringe 200 does not require a special preparation operation or the like. The mounting of 200 is started.
[0036]
[Effects of Embodiment]
In the liquid injector 100 of the present embodiment, when the liquid syringe 200 is inserted into the recess 106 of the injection head 101 from above by manual operation as described above, the cylinder flange 203 is automatically held by the pair of flange holding members 111, When the liquid syringe 200 is pulled upward by a manual operation from this state, the pair of flange holding members 111 are automatically opened.
[0037]
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.
[0038]
In addition, since both the coil spring 122 and the holding shaft 119 are held by the pressing guide member 121 and the pressing guide member 121 is formed integrally with the syringe holding member 105, the structure of the shaft pressing mechanism 118 is simple. With good productivity.
[0039]
[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 pressing guide member 121 of the shaft pressing mechanism 118 is illustrated as being formed in a hollow rectangular parallelepiped. However, for example, the pressing guide member 121 may be formed in a hollow cylindrical shape (not shown). ).
[0040]
Further, in the present embodiment, it is assumed that the liquid injector 100 is used in the vicinity of the MRI apparatus 300. However, the liquid injector 100 can be used in the vicinity of a CT scanner, a PET apparatus, an angiography apparatus, an MRA apparatus, and the like. Further, in the present embodiment, one liquid syringe 200 is mounted in one concave portion 106 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).
[0041]
In the present embodiment, the liquid syringe 200 is directly mounted on 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 can be mounted directly on the liquid injector 100 via the dedicated cylinder adapter (not shown). .
[0042]
【The invention's effect】
In the liquid injector according to the present invention, the cylinder flange of the liquid syringe is inserted into the pair of flange holding members held at the open position by the holding shaft being engaged with the first concave groove of the holding arm and pressed downward. Then, when the flange holding member is pressed by the cylinder flange and rotated, the holding shaft is dropped from the first groove of the holding arm, and the holding shaft is engaged with the second groove of the holding arm. By holding the flange holding member in the closed position, the cylinder flange of the liquid syringe is held, and when the liquid syringe is pulled out from such a state, the flange holding member is pressed by the cylinder flange to rotate. As a result, the holding shaft is dropped from the second groove of the holding arm, and the holding shaft is engaged with the first groove of the holding arm, and the flange holding member is opened. Since the liquid syringe is taken out upward by being held, it is possible to realize a liquid injector can be reliably held to be able to easily attach and detach the liquid syringe with a simple structure.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state in which a drug solution syringe is attached to and detached from an injection head of a drug solution injection device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing the appearance of the liquid injector.
FIG. 3 is a perspective view showing an appearance of the MRI apparatus.
FIG. 4 is an exploded perspective view showing an assembly structure such as a shaft press-contact mechanism.
FIG. 5 is a perspective view showing a state where a cylinder flange is attached to and detached from a flange holding member.
[Explanation of symbols]
Reference Signs List 100 Chemical injection device 105 Syringe holding member 106 Depression 111 Flange holding member 116, 117 Depression groove 118 Shaft pressing mechanism 119 Holding shaft 121 Pressing guide member 122 Coil spring 123 Dropping prevention member

Claims (3)

A piston member having a piston flange formed on the outer periphery of the terminal is slidably inserted into a cylinder member having a cylinder flange formed on the outer periphery of the terminal. At least the cylinder flange and the piston flange of the chemical syringe are separately held. A liquid injector for relatively moving
A syringe holding member in which a concave portion in which the cylinder member is arranged is formed on an upper surface,
A pair of arc-shaped flange holding members which can be displaced to an open position where the cylinder flange is inserted upwardly and a closed position where the cylinder flange is held from both sides orthogonal to the axial direction, and
A holding arm projecting outward from an outer peripheral surface of each of the pair of flange holding members and having first and second concave grooves formed on the outer surface;
An arm support mechanism that rotatably supports the pair of holding arms individually,
The flange holding member is held in the open position by engaging the first groove of the holding arm and the flange holding member is held in the closed position by engaging the second groove. Holding shaft,
A shaft pressing mechanism for pressing the holding shaft against the holding arm,
A liquid injector. The shaft press-contact mechanism,
A coil spring for biasing the holding shaft;
A press-contact guide member that slidably supports the holding shaft and elastically supports the coil spring;
A stopper member for holding the holding shaft and the coil spring on the press-contact guide member,
The liquid injector according to claim 1, further comprising: 3. The liquid injector according to claim 1, wherein the press guide member is formed integrally with the syringe holding member.

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