JP4119224B2 - Chemical injection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chemical injection device in which a chemical syringe for injecting a chemical into a subject is detachably mounted, and particularly to a chemical injection device that holds a cylinder member of a chemical syringe with a cylinder flange.
[0002]
[Prior art]
Currently, there are CT (Computed Tomography) scanner, MRI (Magnetic Resonance Imaging) device, PET (Positron Emission Tomography) device, etc. as medical devices for imaging tomographic images of subjects, as medical devices for imaging blood vessel images of subjects. , Angio device, MRA (MR Angio) device, etc. When using the medical device as described above, a chemical solution such as a contrast medium or physiological saline may be injected into the subject, and a chemical solution injection device that automatically executes this injection has also been put into practical use.
[0003]
The above-described chemical liquid injector has an injection head, and a chemical syringe is detachably attached to the injection head. The chemical liquid syringe has a cylinder member filled with the chemical liquid, and a piston member is slidably inserted into the cylinder member. Generally, a cylinder flange is formed on the outer periphery of the end of the cylinder member, and a piston flange is formed on the outer periphery of the end of the piston member.
[0004]
When using a chemical injection device, the cylinder member of the chemical syringe filled with the chemical solution is connected to the subject with an extension tube, and the chemical syringe is attached to the syringe holding member of the chemical injection device. In a general chemical solution injection device, a concave portion having a shape corresponding to the cylinder member and the cylinder flange of the chemical syringe is formed on the upper surface of the syringe holding member, so that the chemical syringe is inserted by inserting the cylinder member and the cylinder flange into the concave portion. Retained.
[0005]
Further, the chemical liquid injector holds the piston flange separately from the cylinder member by the slider mechanism, and slides the piston member by the slider mechanism. Thus, the chemical liquid is injected into the subject from the chemical liquid syringe, and, for example, the chemical liquid is sucked into the chemical liquid syringe from the chemical liquid tank as necessary.
[0006]
Currently, there are various proposals as the above-described chemical solution injection device (for example, see Patent Documents 1 and 2).
[0007]
[Patent Document 1]
JP 2002-11096 (page 2-3, FIG. 11-14)
[Patent Document 2]
JP 2002-102343 (page 2-3, FIG. 8)
[0008]
[Problems to be solved by the invention]
In the above-described chemical liquid injector, since the chemical liquid syringe is held by inserting the cylinder member and the cylinder flange into the concave portion of the syringe holding member, the chemical liquid syringe can be easily attached / detached. Is difficult. In order to solve this problem, there has also been proposed a chemical injection device in which a clamp member that is manually opened and closed is added to the syringe holding member, and the chemical syringe attached to the concave portion of the syringe holding member is securely held by the clamp member.
[0009]
However, this requires a two-step operation to attach / detach the chemical syringe to / from the chemical injection device, and it is difficult to attach / detach the chemical syringe to / from the chemical injection device with one hand. As described above, the chemical injection device is used in the medical field. However, in the medical field, it is required to always keep one hand clean, and it is important that the chemical injection device that causes the contamination can be operated 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 chemical liquid injector capable of easily and reliably attaching and detaching a chemical liquid syringe with one hand without requiring a multi-step operation.
[0011]
[Means for Solving the Problems]
The chemical injection device of the present invention has a syringe holding member, a pair of flange holding members, a holding biasing mechanism, a closing holding member, a closing biasing mechanism, and a manual operation member, and at least a cylinder flange and a piston of the chemical syringe. Hold the flange separately and move it relative.
[0012]
The syringe holding member has a recess formed on the upper surface, and the cylinder member is disposed in the recess. The pair of flange holding members are formed in a circular arc shape, and are freely displaceable between an open position where the cylinder flange can be inserted by opening upward and a closed position where the cylinder flange is held from both sides orthogonal to the axial direction. Are supported on each shaft. The holding biasing mechanism biases the pair of flange holding members from the closed position to the open position, and the closing holding member is supported in a vertically displaceable manner and is disposed at the closed position. Engage with the bottom of the. The closing biasing mechanism biases the closing holding member upward, and the manual operation member displaces the closing holding member downward in response to the manual operation.
[0013]
Therefore, in a state where the pair of flange holding members are arranged at the open position by the bias of the holding bias mechanism, the cylinder flange of the chemical syringe can be inserted into the flange holding member from above. In this way, when the cylinder flange is inserted into the flange holding member in the open position from above, the flange holding member is pressed from the cylinder flange to oppose the bias of the holding bias mechanism to move from the open position to the closed position. Displace. Then, the closing holding member engages with the lower ends of the pair of flange holding members arranged at the closing position by the biasing force of the closing biasing mechanism, so that the flange holding member is fixed at the closing position and the cylinder flange is held. The
[0014]
Further, from this state, when the closing holding member is displaced downward by the manual operation member in opposition to the biasing of the closing biasing mechanism, the pair of flange holding members are separated by dropping from the lower end. It is displaced from the closed position to the open position by the bias of the holding bias mechanism. As a result, the holding of the cylinder flange by the flange holding member is released, so that the chemical syringe can be taken out upward.
[0015]
It should be noted that the various components referred to in the present invention do not have to be individually independent. For example, a plurality of components are formed as one member, and a certain component is a component of another component. It is possible that it is a part, a part of a certain component overlaps a part of another component, and the like.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, the front, rear, left, right, top, and bottom directions are defined and described as shown in the drawings. However, this is defined for the sake of simplicity, and is used when the apparatus of the present invention is manufactured or used. It does not limit the direction of time.
[0017]
As shown in FIG. 4, the chemical injection device 100 according to 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 121 and a liquid crystal display 122 are mounted on the upper surface of the apparatus main body 102, and an injection head 101 is mounted on the side of the apparatus main body 102 with an arm 104. As shown in FIG. 2, the injection head 101 has a semi-cylindrical groove-like recess 106 formed on the upper surface of the syringe holding member 105, and the chemical syringe 200 is detachably attached to the recess 106. .
[0018]
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 on the outer periphery of the cylinder member 201, and a piston flange 204 is formed on the outer periphery of the piston member 202.
[0019]
The injection head 101 has a piston drive mechanism 107 disposed behind the concave portion 106 of the syringe holding member 105. The piston drive mechanism 107 holds the piston flange 204 and moves it back and forth. In addition, 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 drug solution syringe 200 with the pair of flange holding members 111.
[0020]
More specifically, as shown in FIGS. 1 and 5, the flange holding member 111 is formed in an arc shape corresponding to the cylinder flange 203, and the concave groove 112 into which the cylinder flange 203 is inserted is formed on the inner peripheral surface. Is formed. A pair of flange holding members 111 has a holding arm 113 projecting from the outer peripheral surface thereof, and is pivotally supported by the holding arm 113 so as to be rotatable in the vertical direction.
[0021]
The flange holding member 111 is engaged with a holding urging mechanism (not shown) made of, for example, a coil spring, and as shown in FIGS. 1 (b) and 5 (a). The urging mechanism is urged from the closed position to the open position. The lower end of the flange holding member 111 extends downward, and a right-angled recess 114 is formed inside the lower end.
[0022]
A flat plate-like closing holding member 116 is arranged below the pair of flange holding members 111, and the closing holding member 116 is pivotally supported at the rear end so as to be swingable in the vertical direction. The closing holding member 116 is urged upward by a closing urging mechanism (not shown) made of, for example, a coil spring, and the front end of the closing holding member 116 is formed in the recess 114 at the lower end of the pair of flange holding members 111 disposed at the closing position. Engages freely from below.
[0023]
Further, an arc-shaped manual operation member 118 is disposed behind the flange holding member 111, and this manual operation member 118 is axially supported so as to be swingable in the vertical direction at the right end coaxially with the right flange holding member 111. Has been. A manual operation section 119 is formed at the left end of the manual operation member 118, and the operation section 119 is exposed to the opening 120 of the syringe holding member 111 as shown in FIG. 2. As shown in FIG. 1, the center of the manual operation member 118 is in contact with the closing holding member 116 from above, and when the operating portion 119 is manually operated downward, the closing holding member 116 is displaced downward.
[0024]
In addition, as shown in FIG. 4, the chemical injection device 100 of the present embodiment is used in the vicinity of the imaging unit 301 of the MRI apparatus 300, for example, and connected to the control unit 302 of the MRI apparatus 300 as necessary. The control unit 302 includes a computer system, and controls the operation of the imaging unit 301 and displays a tomographic image.
[0025]
[Operation of the embodiment]
In the configuration as described above, when using the liquid injector 100 according to the present embodiment, for example, the operator selects an appropriate liquid syringe 200 corresponding to the liquid injected into the subject, and the liquid syringe 200 is selected as the MRI. An extension tube is connected to a subject located in the imaging unit 301 of the apparatus 300 (not shown).
[0026]
In the state in which the liquid syringe 200 is not attached to the injection head 101, the liquid injector 100 is disposed at the open position by the pair of flange holding members 111 as shown in FIG. Therefore, as shown in FIG. 2, the cylinder flange 203 of the chemical syringe 200 can be inserted from above into the cylinder flange 203.
[0027]
When the cylinder flange 203 is thus inserted from above into the flange holding member 111 in the open position, the flange holding member 111 is held and urged by being pressed against the cylinder flange 203 as shown in FIG. It is displaced from the open position to the closed position in opposition to the mechanism bias.
[0028]
Then, as shown in FIGS. 5C and 1B, the closing holding member 116 is engaged with the lower ends of the pair of flange holding members 111 arranged at the closing position by the biasing force of the closing biasing mechanism. As shown in FIG. 2B, the flange holding member 111 is fixed in the closed position, and the cylinder flange 203 is held.
[0029]
At this time, since the piston drive mechanism 107 holds the piston flange 204 of the chemical solution syringe 200, when the operator performs a predetermined operation on the operation panel 121 of the chemical solution injection device 100, the piston drive mechanism 107 slides the piston member 202. Thus, the chemical solution is injected from the cylinder member 201 to the subject.
[0030]
When this injection operation is completed, for example, the operator removes the extension tube from the subject and presses down the operation unit 119 exposed to the side of the upper surface of the injection head 101. Then, the closing holding member 116 together with the manual operation member 118 is displaced downward in opposition to the biasing force of the closing biasing mechanism by this pressing, so that the closing holding member 116 drops from the lower ends of the pair of flange holding members 111. .
[0031]
Then, the pair of flange holding members 111 are displaced from the closed position to the open position by the urging of the holding urging mechanism, so that the holding of the cylinder flange 203 by the flange holding member 111 is released, and the operator can use the chemical syringe 200. Can be taken out upward.
[0032]
In addition, in the state where the chemical syringe 200 is not attached to the chemical injection device 100 as described above, the flange holding member 111 is held in the open position as described above, so that no special preparation operation or the like is required. The mounting of the chemical syringe 200 is started.
[0033]
[Effect of the embodiment]
In the chemical injection device 100 of the present embodiment, when the chemical syringe 200 is inserted from above into the recess 106 of the injection head 101 by manual operation as described above, the cylinder flange 203 is automatically held by the pair of flange holding members 111. Fixed to. Further, when the manual operation member 118 is displaced downward from this state by manual operation, the pair of flange holding members 111 automatically open the cylinder flange 203.
[0034]
For this reason, since the chemical syringe 200 can be easily and reliably attached to and detached from the injection head 101 with one hand, the chemical injection device 100 that causes fouling at the medical site can be operated with only one hand, and the other hand is always attached. It can be kept clean.
[0035]
In particular, when the flange holding member 111 is displaced from the closed position to the open position, the cylinder flange 203 is displaced upward, so that the chemical syringe 200 can be easily taken out. In addition, the closing holding member 116 is formed in a flat plate shape, and is pivotally supported at one end so as to be swingable in the vertical direction, and engages with the lower end of the flange holding member 111 at the other end. Can be executed.
[0036]
Further, the manual operation member 118 is pivotally supported at one end so as to be swingable in the vertical direction, and is formed in an arc shape in which the operation portion 119 is located at the other end. Therefore, the closing holding member 116 can be easily pressed downward by the lever principle.
[0037]
Moreover, since the manual operation member 118 and one of the pair of flange holding members 111 are coaxially supported, there is no need to form a dedicated shaft support mechanism for the manual operation member 118, and the structure is simplified. Thus, the productivity of the chemical liquid injector 100 can be improved.
[0038]
[Modification of Embodiment]
The present invention is not limited to the present embodiment, and various modifications are allowed without departing from the scope of the present invention. For example, in the above embodiment, the closing holding member 116 is formed in a flat plate shape and is pivotally supported at one end so as to be swingable in the vertical direction. However, the closing holding member 116 slidably supported in the vertical direction (see FIG. (Not shown) can be engaged with the lower end of the flange holding member 111.
[0039]
In the above embodiment, the manual operation member 118 is formed in an arc shape and is pivotally supported at one end so as to be swingable in the vertical direction. For example, the manual operation member is supported so as to be slidable in the vertical direction. Can be brought into contact with the closing holding member 116 from above, and the closing holding member slidable in the vertical direction and the manual operation member can be integrally formed (both not shown).
[0040]
Furthermore, although the manual operation member 118 and one of the pair of flange holding members 111 are illustrated as being coaxially supported in the above embodiment, for example, the manual operation member 118 is different from the flange holding member 111. It is also possible to support with a support mechanism.
[0041]
In this embodiment, it is assumed that the chemical injection device 100 is used in the vicinity of the MRI apparatus 300, but this can also be used in the vicinity of a CT scanner, a PET apparatus, an angio apparatus, an MRA apparatus, or the like. Furthermore, in the present embodiment, it is exemplified that one chemical syringe 200 is attached to one concave portion 106 of the chemical injector 100, but a plurality of chemical syringes 200 can be attached to a plurality of concave portions of the injection head. (Not shown).
[0042]
Further, in the present embodiment, it is exemplified that the chemical syringe 200 is directly attached to the chemical injector 100. However, since there are various sizes of the currently marketed chemical syringe 200, for example, the maximum size chemical syringe 200 is used. It is also possible that only the chemical solution injection device 100 is directly attached to the chemical solution injection device 100, and various sizes of the chemical solution syringes 200 other than the maximum are attached to the chemical solution injection device 100 via a dedicated cylinder adapter (not shown). .
[0043]
【The invention's effect】
In the chemical injection device of the present invention, when the cylinder flange of the chemical syringe is inserted from above into the flange holding member arranged at the open position by the urging of the holding urging mechanism, it is closed by being pressed by the cylinder flange. Since the closing holding member engages with the lower end of the pair of flange holding members displaced to the position by the bias of the closing biasing mechanism, the cylinder flange can be fixedly held by the flange holding member. When the closing holding member is displaced downward by the manual operation member in opposition to the urging force of the closing urging mechanism from the state, the pair of flange holding members of the holding urging mechanism are removed by dropping the closing holding member from the lower end. Since the biased position is displaced from the closed position to the open position, the chemical syringe can be removed upward, and the chemical syringe can be easily attached and detached with one hand. The liquid injector can be reliably held Te can be realized by a simple structure.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a mechanism for holding a cylinder flange of a chemical liquid injector according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a state where a chemical syringe is attached to and detached from an injection head of the chemical injection device.
FIG. 3 is a perspective view showing an external appearance of a chemical liquid injector.
FIG. 4 is a perspective view showing an appearance of an MRI apparatus.
FIG. 5 is a process diagram showing a state in which a cylinder flange is attached to and detached from a flange holding member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 Chemical liquid injection apparatus 105 Syringe holding member 106 Recessed part 107 Piston drive mechanism 111 Flange holding member 116 Closure holding member 118 Manual operation member 119 Operation part 200 Chemical liquid syringe 201 Cylinder member 202 Piston member 203 Cylinder flange 204 Piston flange

Claims (4)

At least the cylinder flange and the piston flange of the chemical syringe in which the piston member having the piston flange formed on the outer periphery of the cylinder is slidably inserted into the cylinder member having the cylinder flange formed on the outer periphery of the terminal are separately held. A chemical solution injection device for relative movement,
A syringe holding member in which a concave portion in which the cylinder member is disposed is formed on the upper surface;
A pair of arc-shaped flange holding members that are pivotally supported so as to be freely displaceable between an open position where the cylinder flange can be inserted and a closed position where the cylinder flange is held from both sides orthogonal to the axial direction. When,
A holding and biasing mechanism that biases the pair of flange holding members from the closed position to the open position;
A closing holding member that is supported in a vertically displaceable manner and engages with the lower ends of the pair of flange holding members arranged at the closing position;
A closing biasing mechanism biasing the closing holding member upward;
A manual operation member for displacing the closing holding member downward in response to a manual operation;
A chemical injection device. The closing holding member is pivotally supported at one end so as to be swingable in the vertical direction, and the other end is engaged with the lower end of the pair of flange holding members disposed at the closing position so that the other end can be freely engaged and disengaged from below. The chemical | medical solution injection device of Claim 1 currently formed in. The manual operation member is pivotally supported at one end so as to be swingable in the vertical direction, and an operation portion to be manually operated is formed at the other end, so that the central portion has an arc shape in contact with the closing holding member from above. The chemical | medical solution injection device of Claim 2 currently formed. The chemical injection device according to claim 3, wherein the manual operation member is pivotally supported at the one end coaxially with one of the pair of flange holding members.

Images