JPWO2007129445A1 - Syringe, chemical injection device - Google Patents

Abstract

Provided is a syringe or the like capable of easily injecting or aspirating a plurality of drug solutions with a simpler configuration than a conventional syringe. An outer cylinder 200 having a discharge port 500, one or more inner cylinders 300 provided in the outer cylinder 200, and an outer cylinder piston 700 that pushes a chemical solution filled in the outer cylinder 200 toward the discharge port 500. The syringe 100 includes an inner cylinder piston 800 that pushes the chemical solution filled in the inner cylinder 300 toward the discharge port 500.

Description

  The present invention relates to a syringe and a chemical liquid injector.

CT (Computed Tomography) scanner, MRI (Magnetic Resonance Imaging) apparatus, PET (Positron Emission Tomography) apparatus, and the like, a fluoroscopic imaging apparatus that captures tomographic images that are fluoroscopic images of a subject, a CT angiography apparatus, and MRAo MRA When using a medical device that captures a blood vessel image that is a fluoroscopic image of a subject such as a subject, a medical solution such as a contrast medium or physiological saline may be injected into the subject. The injection of the chemical liquid is performed by pushing the chemical liquid filled in the syringe by the piston and discharging it from the discharge port of the syringe. Conventionally, the following syringe has been proposed. That is, a fixed small cylinder is provided inside the cylinder of the syringe coaxially with the cylinder, and the outer cylinder is a syringe having a donut-shaped space (see FIG. 27 of Patent Document 1). In this syringe, a partition portion and a small plunger are fitted into a fixed small cylinder, and a donut-shaped partition portion and a large plunger are fitted into the cylinder, respectively. A chamber is formed between the partition portion of the fixed type small cylinder and the large plunger, and a donut-shaped chamber is formed between the partition portion of the cylinder and the large plunger, and different injections are accommodated in these chambers ( (See paragraph 0060 of Patent Document 1).
JP-A-8-308928 (particularly FIG. 27)

However, since the conventional syringe has a complicated configuration as apparent from the above, it is necessary to take a complicated process when operating the syringe. Hereinafter, the process of operating the conventional syringe will be described.
In the conventional syringe, first, when the pressing portion is pushed and the small plunger is pushed toward the injection needle, the pressure in the chamber rises and the partition portion moves toward the injection needle. The air on the injection needle side of the partition enters the chamber through the through hole and raises the pressure in the chamber. In response to this, the donut-shaped partition also moves to the injection needle side. The air on the left side of the partition is discharged to the outside through the air vent hole. When the partition moves and passes through the through-hole, the injection in the room enters the chamber through the through-hole, and the two injections are mixed. The donut-shaped partition further advances toward the injection needle as the pressure increases (see paragraph 0062 of Patent Document 1).
When the pressing portion of the small plunger overlaps the pressing portion of the large plunger, the large plunger starts to move toward the injection needle together. Thereby, the pressure in the chamber further rises, and the donut-shaped partition portion eventually moves to the left side of the through hole, and the chamber and the injection needle are in communication with each other via the through hole and the terminal communication portion. In this state, the needle is directed upward, the room air is discharged from the injection needle to the outside, and then injection is performed. The space from the through hole to the needle should be made as small as possible so that the remaining amount of the injection solution is as small as possible (see paragraph 0063 of Patent Document 1).
As described above, since the conventional syringe has a complicated configuration, there is a problem that it is necessary to take a complicated process when operating the syringe.
Then, an object of this invention is to provide the syringe and chemical | medical solution injection | pouring apparatus which can inject | pour or suck a several chemical | medical solution easily with a structure simpler than the conventional syringe.

  According to the present invention, the above-described problem is solved by the following means.

The first invention is for an outer cylinder having a discharge port, one or more inner cylinders provided in the outer cylinder, and an outer cylinder that pushes a chemical solution filled in the outer cylinder toward the discharge port. A syringe comprising: a piston; and an inner cylinder piston that pushes a chemical solution filled in the inner cylinder toward the discharge port.
According to the first invention, if the outer cylinder piston is pushed, the chemical liquid filled in the outer cylinder is discharged, and if the outer cylinder piston is pulled, the chemical liquid can be sucked into the outer cylinder. . Further, according to the first invention, it is possible to discharge the chemical liquid filled in the inner cylinder by pushing the inner cylinder piston, and to suck the chemical liquid into the inner cylinder by pulling the inner cylinder piston. It is. Therefore, according to the first invention, it is possible to easily inject or suck a plurality of medicinal liquids with a simpler configuration than the conventional syringe.
When there are two or more inner cylinders, the inner cylinder is provided inside the outer cylinder, and the inner cylinders are sequentially provided inside the inner cylinder.
The outer cylinder piston and the inner cylinder piston need only be able to push the chemical solution filled in the outer cylinder and the inner cylinder toward the discharge port, respectively. However, the piston for the outer cylinder and the piston for the inner cylinder include a piston that can be “pulled” in addition to “push”. When the outer cylinder piston and the inner cylinder piston can be “pushed” and “pulled”, the syringe according to the present invention is not only a syringe capable of injecting a chemical solution but also capable of sucking a liquid containing the chemical solution. It can also be a syringe.
The chemical solution is, for example, a contrast agent used for imaging a tomographic image that is a fluoroscopic image of a subject using a CT (Computed Tomography) scanner, an MRI (Magnetic Resonance Imaging) apparatus, a PET (Positron Emission Tomography) apparatus, or the like. In addition, it refers to a contrast agent used when a blood vessel image, which is a fluoroscopic image of a subject, is imaged with a CT angio device or an MRA (MR Angio) device.

A second invention is a syringe according to the first invention, wherein the outer cylinder and the inner cylinder are provided concentrically.
According to the second invention, since the outer cylinder and the inner cylinder are provided concentrically, it is possible to prevent a bias from occurring in the injection of the chemical solution from the outer cylinder.

A third invention is the syringe according to the first invention or the second invention, characterized in that a support member for supporting the inner cylinder is provided on the discharge port side.
According to the third invention, it is possible to support the inner cylinder without limiting the amount of the chemical liquid injected from the outer cylinder. The support member can be provided between the inner cylinder and the outer cylinder when the number of inner cylinders is one. When there are two or more inner cylinders, the support member can be provided between the inner cylinder and the outer cylinder. A support member can be provided, and can also be provided between the inner cylinder and the inner cylinder.

4th invention is provided with the valve which prevents the back flow of the chemical | medical solution with respect to the said inner cylinder from the said discharge outlet, It is a syringe which concerns on any one of 1st invention-3rd invention characterized by the above-mentioned.
According to the fourth invention, when the outer cylinder piston is pulled, it is possible to prevent the chemical liquid from flowing back to the inner cylinder.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the shape of the discharge side of at least one of the outer cylinder piston and the inner cylinder piston is a mountain shape. It is the syringe which concerns on one.
According to the fifth aspect, the force required to inject the chemical solution can be reduced.

According to a sixth aspect of the present invention, at least one of the outer cylinder piston and the inner cylinder piston can be locked to a distal end of a pressing member that pushes the outer cylinder piston and the inner cylinder piston. A syringe according to any one of the first to fifth inventions, wherein a lock portion is provided.
According to the sixth aspect of the invention, the outer cylinder piston and the inner cylinder piston can be pulled as well as pushed, and can be sucked in addition to the injection of the chemical solution.

7th invention is the chemical injection device characterized by attaching the syringe which concerns on any one of 1st invention-6th invention.
The chemical injection device according to the seventh aspect of the invention can be easily controlled as compared with the chemical injection device to which the conventional syringe is attached.

  According to the present invention, it is possible to easily inject or suck a plurality of medicinal solutions with a simpler configuration than a conventional syringe.

It is a schematic perspective view of the syringe 100 which concerns on embodiment of this invention. It is AA sectional drawing of the syringe 100 which concerns on embodiment of this invention. It is sectional drawing of the syringe 100 which concerns on other embodiment of this invention.

Explanation of symbols

100 Syringe 200 Outer cylinder 300 Inner cylinder 400 Support member 410 Through hole 500 Discharge port 600 Valve 700 Outer cylinder piston 710 Lock portion 800 Inner cylinder piston 810 Lock portion

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view of a syringe 100 according to the embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of the syringe 100 according to the embodiment of the present invention.
As shown in FIGS. 1 and 2, the syringe 100 according to the embodiment of the present invention includes an outer cylinder 200 and an inner cylinder 300. Although the present invention does not limit the positional relationship between the outer cylinder 200 and the inner cylinder 300, if the outer cylinder 200 and the inner cylinder 300 are concentric, there is a bias in the injection of the chemical solution from the outer cylinder 200. Since it can prevent, it is preferable.
The inner cylinder 300 is supported by the outer cylinder 200 by the support member 400 and does not move unnecessarily in the outer cylinder 200. The support member 400 can be provided at an arbitrary position. However, if the support member 400 is provided on the side opposite to the discharge port 500, the movement of the outer cylinder piston 700 is hindered, and the amount of the chemical injected from the outer cylinder 200 is reduced. It will be restricted. Therefore, it is preferable that the support member 400 is provided on the discharge port 500 side, particularly on the distal end portion of the inner cylinder 300, like the syringe 100 according to the present embodiment. Even in this case, the portion of the inner cylinder 300 opposite to the discharge port 500 is sandwiched between the outer cylinder piston 700 and the inner cylinder piston 800, and thus moves greatly with respect to the outer cylinder 200. Is prevented. In addition, since the support member 400 has the through-hole 410, the movement of the chemical solution is not blocked by the support member 400.
A valve 600 is provided at the tip of the inner cylinder 300 to prevent the back flow of the chemical solution.
The outer cylinder piston 700 and the inner cylinder piston 800 are independent, and the chemical liquid can be injected and sucked only by the outer cylinder piston 700, or the chemical liquid can be injected and sucked only by the inner cylinder piston 800. It is possible.
In the embodiment shown in FIG. 2, the outer cylinder piston 700 and the inner cylinder piston 800 are formed to have flat ends, but the outer cylinder piston 700 and the inner cylinder piston 800 are arbitrarily formed. There is no particular limitation. The tip shapes of the outer cylinder piston 700 and the inner cylinder piston 800 can be formed in a mountain shape as shown in FIG. 3, for example, and the force required to inject the chemical can be reduced.
In addition, lock portions 710 and 810 such as notches and fitting irregularities are provided on the surface opposite to the discharge port 500 side of the outer cylinder piston 700 and the inner cylinder piston 800, and a chemical solution injection device (FIG. If it is locked with a presser (not shown) or the like, the outer cylinder piston 700 and the inner cylinder piston 800 can be pulled as well as pushed.

Hereinafter, an example of a method for injecting a chemical solution using the syringe according to the embodiment of the present invention will be described.
First, physiological saline is accommodated in the outer cylinder 200, and a contrast agent is accommodated in the inner cylinder 300. Here, the contrast agent is a CT (Computed Tomography) scanner, an MRI (Magnetic Resonance Imaging) apparatus, a PET (Positron Emission Tomography) apparatus, or the like used when imaging a tomographic image that is a fluoroscopic image of a subject. It is used when a blood vessel image, which is a fluoroscopic image of a subject, is picked up by a CT angio device or an MRA (MR Angio) device.
Next, in order to remove bubbles mixed in a tube (not shown) connected to the discharge port 500, the outer cylinder piston 700 is pushed, and the physiological saline contained in the outer tube 200 is discharged from the discharge port 500. Discharge.
Next, the inner cylinder piston 800 is pushed, and the contrast agent accommodated in the inner cylinder 300 is discharged from the discharge port 500. At this time, even if the inner cylinder piston 800 is pulled, the valve 600 is provided, so that the chemical solution does not flow back into the syringe 100.
Next, another example of a method for injecting a chemical solution using the syringe according to the embodiment of the present invention will be described.
First, the contrast medium is accommodated in the inner cylinder 300.
Next, the outer cylinder piston 700 is pulled to suck the chemical into the outer cylinder 200. At this time, since the valve 600 is provided, the chemical liquid does not flow back into the inner cylinder 300.
Next, the inner cylinder piston 800 is pushed to inject the contrast agent contained in the inner cylinder 300 from the discharge port 500.

  According to the syringe 100 according to the embodiment of the present invention described above, it is possible to easily inject or suck a plurality of chemical solutions with a simpler configuration than a conventional syringe. Moreover, according to the syringe 100 which concerns on embodiment of this invention demonstrated above, two types of chemical | medical solutions can be inject | poured, without replacing two syringes. Further, even when it is necessary to inject / suck the chemical solution, it is not necessary to replace the two syringes. Therefore, according to the syringe 100 according to the embodiment of the present invention, it is possible to reduce the time and labor required for the process of injecting and aspirating the chemical solution, and to prevent a medical error due to a processing error.

Since the above description relates to the embodiment, the present invention is not limited by the above description. For example, in the above description, the syringe 100 has two cylinders, the outer cylinder 200 and the inner cylinder 300, but the syringe according to the present invention may have three or more cylinders. In addition, the outer cylinder piston 700 and the inner cylinder piston 800 need only be able to push the chemical solution filled in the outer cylinder 200 and the inner cylinder 300 toward the discharge port, respectively, but in addition to “push”, “pull”. Is also possible. When the outer cylinder piston 200 and the inner cylinder piston 300 can be “pushed” and “pulled”, the syringe 100 according to the above embodiment is not only a syringe capable of injecting a chemical solution but also includes a chemical solution. It also serves as a syringe capable of sucking liquid.

Claims (7)

An outer cylinder having a discharge port;
One or more inner cylinders provided inside the outer cylinder;
An outer cylinder piston that pushes the liquid medicine filled in the outer cylinder toward the discharge port;
A piston for an inner cylinder that pushes the chemical filled in the inner cylinder toward the discharge port;
A syringe comprising:   The syringe according to claim 1, wherein the outer cylinder and the inner cylinder are provided concentrically.   The syringe according to claim 1 or 2, wherein a support member that supports the inner cylinder is provided on the discharge port side.   The syringe according to any one of claims 1 to 3, further comprising a valve that prevents a back flow of the chemical liquid from the discharge port to the inner cylinder.   The syringe according to any one of claims 1 to 4, wherein a shape of the discharge side of at least one of the outer cylinder piston and the inner cylinder piston is a mountain shape.   At least one of the outer cylinder piston and the inner cylinder piston opposite to the discharge side is provided with a lock portion that can lock the distal end of the outer cylinder piston and the pressing member that presses the inner cylinder piston. The syringe according to any one of claims 1 to 5, wherein the syringe is characterized.   A medical fluid injection device to which the syringe according to any one of claims 1 to 6 is attached.

Images