JP2003290347A - Injection head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection head for easily and securely attaching/ detaching a syringe by one hand. <P>SOLUTION: When a holding lock member 115 is located at the release position against the energizing force, a cylinder holding member 111 is located at the open position because of the energizing force, and therefore, a cylinder flange 203 of the syringe 200 can be inserted into an opening of the cylinder holding member 111 from above. As the cylinder holding member 111, inserted in this way, is displayed from the open position to the close position against the energizing force, the cylinder flange 203 of the syringe 200 is held by the cylinder holding member 111. When the cylinder holding member 111 is located at the close position in such a way, the holding lock member 115 is slid from the release position to the holding position by the energizing force, and therefore, the cylinder holding member 111 is fixed at the close position as the holding lock member 115 abuts to the cylinder holding member 111. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an injection head to which a syringe for injecting a drug solution into a subject is detachably mounted.

[0002]

2. Description of the Related Art CT (C
The omputed tomography scanner is capable of taking a tomographic image of the subject by the application of radiography.
An I (Magnetic Resonance Imaging) apparatus can capture a tomographic image of a subject in real time by the magnetic resonance effect, and an angio apparatus can capture a blood vessel image of the subject by applying X-ray imaging.

When using the above-mentioned device, a medical liquid such as a contrast medium or physiological saline may be injected into a subject, and a medical liquid injection device for automatically performing this injection has been put into practical use. This chemical injection device has an injection head, and a syringe is detachably attached to this injection head.

The syringe has a cylinder member filled with a drug solution, 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.

When using the drug solution injector, the cylinder member of the syringe filled with the drug solution is connected to the subject by an extension tube, and the cylinder member is mounted on the injector head. In a typical injection head, a recess having a shape corresponding to the cylinder member and the cylinder flange of the syringe is formed on the upper surface of the head body, so if the cylinder member and the cylinder flange are inserted into this recess, the syringe is retained in the injection head. To be done. Further, the injection head holds the piston flange separately from the cylinder member by the slider mechanism, and slides the piston member by the slider mechanism. With this, the medicinal solution is injected into the subject from the syringe and aspirated if necessary.

At present, since plural kinds of sizes are used as syringes, plural kinds of syringes can be used.
Multiple types of syringe adapters are also available to fit individual injection heads. In that case, the syringe adapter may be mounted on the syringe and then mounted on the injection head, but in normal medical sites, there is a tendency to continuously use syringes of the same size.
A syringe of the same size is replaced with the syringe adapter attached to the injection head.

[0007]

In the injection head of the above-described chemical injection device, the syringe is held by inserting the cylinder member and the cylinder flange into the recess of the head body, so that the syringe can be easily attached and detached. However, it is difficult to hold the syringe securely in the injection head.

In order to solve this problem, there is also proposed an injection head in which a clamp member which is opened and closed by a manual operation is provided in the injection head, and the syringe mounted in the recess of the head body is securely held by the clamp member. However, this requires a two-step operation to attach and detach the syringe to and from the injection head, and it is also difficult to attach and detach the syringe to and from the injection head with one hand. As described above, the chemical liquid injector is used in the medical field, but in the medical field, it is required to always keep one hand clean, and it is important to be able to operate the chemical liquid injector that causes contamination with only one hand. .

The present invention has been made in view of the above problems, and an object of the present invention is to provide an injection head capable of easily and surely attaching and detaching a syringe with one hand without requiring a plurality of steps of operation. .

[0010]

The injection head of the present invention comprises:
It has a head body, a pair of cylinder holding members, a holding lock member, an opening urging means, and a lock urging means, and holds the cylinder flange and the piston flange of the syringe separately and relatively moves them.

The head body has a recess formed in the upper surface thereof, and the cylinder member of the syringe is disposed in this recess.
The cylinder holding member is movably supported at an open position where the cylinder flange is opened so that the cylinder flange can be inserted therein, and a closed position where the cylinder flange is held from both sides orthogonal to the axial direction. The holding lock member is slidable in the axial direction between a release position where it comes into contact with the cylinder holding member in the open position in the axial direction and a holding position where it comes into contact with the cylinder holding member in the closed position in a direction orthogonal to the axial direction. It is supported. The opening urging means urges the cylinder holding member to the opening position, and the lock urging means urges the holding lock member to the holding position.

Therefore, when the holding lock member is placed in the release position against the bias of the lock biasing means, the cylinder holding member is placed in the open position by the biasing of the opening biasing means. The cylinder flange of the syringe can be inserted into the opening of the cylinder holding member from above.
When the cylinder flange of the syringe is inserted into the cylinder holding member in this manner, the cylinder holding member is displaced from the open position to the closed position against the bias of the opening biasing means. Held by. When the cylinder holding member is thus arranged at the closed position, the holding lock member slides from the release position to the holding position by the urging of the lock urging means.
As a result, the cylinder holding member is fixed in the closed position by the contact of the holding lock member. From this state, when the holding lock member is slid to the release position against the bias of the lock biasing means, the contact of the holding lock member with the cylinder holding member is released, so that the opening biasing means biases the open position. Is located in.

[0013]

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, as shown in the drawings, description will be given by defining the front, rear, left, right, up, and down directions, but this is provided for the sake of convenience to simplify the description,
It does not limit the direction of the device of the present invention during manufacture or use.

As shown in FIG. 9, the chemical liquid injector 100 of the present embodiment is formed for use near the MRI apparatus 300. As shown in FIG.
The injection head 101 is attached to the apparatus main body 102 with a stand 103. An arm 10 is provided on the side of the apparatus body 102.
4 is attached, and the injection head 101 is attached to the tip of the arm 104.

As shown in FIG. 2, this injection head 101 has a semi-cylindrical groove-shaped recess 1 on the upper surface of a head body 105.
06 is formed, and the syringe 2
00 is detachably attached directly or via a syringe adapter 400 described later. Thus, the injection head 10
When the syringe 200 is attached to the injection head 1,
The front-back direction of 1 and the axial direction of the syringe 200 match.

The syringe 200 comprises a cylinder member 201 and a piston member 202, and the piston member 202 is slidably inserted into the cylinder member 201. The cylinder flange 20 is provided on the outer periphery of the end of the cylinder member 201.
3 is formed, and a piston flange 204 is formed on the outer periphery of the distal end of the piston member 202.

The injection head 101 has a pair of cylinder holding members 111 at predetermined positions in the recess 106 of the head body 105.
Are mounted, and the pair of cylinder holding members 11
1 holds the cylinder flange 203 of the syringe 200. More specifically, as shown in FIG. 1, the cylinder holding member 111 is formed in a semi-circular 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. ing.

The cylinder holding member 111 is integrally formed with an insertion guide 113 which is widened to the left and right as it goes upward, and the concave groove 11 extends to the upper surface of the insertion guide 113.
2 is formed. A pair of cylinder holding members 111
A holding arm 114 projects from the outer peripheral surface of the shaft, and is vertically rotatably supported by the holding arm 114.

Therefore, the pair of cylinder holding members 111
As shown in FIG. 1 (a) and FIG. 2 (a), is an open position where the cylinder flange 203 can be inserted and opened upward,
As shown in FIGS. 1B and 2B, the cylinder flange 203 is displaceably supported at a closed position for holding the cylinder flange 203 from both left and right sides.

Further, as shown in FIG. 1, the injection head 10
1, one holding lock member 115 is mounted slidably in the front-rear direction.
Is slidably supported at a release position where it contacts the cylinder holding member 111 on the right side of the open position from the rear and a holding position where it contacts the cylinder holding member 111 on the right side of the closed position from the right side.

A bending spring (not shown), which is an opening urging means, is attached to the pair of cylinder holding members 111, and the bending spring serves as a pair of cylinder holding members 1.
11 is biased to the open position. A pressure spring (not shown), which is a lock urging means, is attached to the injection head 101, and the pressure spring urges the holding lock member 115 to the holding position. Further, as shown in FIG. 2, an operation lever 116 is connected to the holding lock member 115, and this operation lever 116 is connected to the head body 10.
It is exposed on the right side of the upper surface of No. 5.

As described above, the injection head 1 of this embodiment is used.
Since the syringe 200 mounted on 01 has a plurality of sizes, the recess 106 and the cylinder holding member 111 of the head body 105 are formed to correspond to the maximum size syringe 200. Therefore, as shown in FIGS. 4 and 5, when the injection head 101 is equipped with a syringe 200 other than the maximum size, a syringe adapter 400 dedicated to each is used to adapt the syringe 200 to the injection head 101. .

The syringe adapter 400 of the present embodiment has an adapter body 401 formed in a semi-cylindrical shape. The adapter body 401 corresponds to the cylinder member 201 of the syringe 200 having the maximum outer shape, and
Cylinder member 2 of syringe 200 to which the inner surface shape is attached
Corresponds to 01.

On the outer periphery of the adapter body 401 near the end, the cylinder flange 2 of the maximum size syringe 200 is provided.
03, an adapter flange 402 having the same shape as that of No. 03 is formed, and a concave groove 403 into which the cylinder flange 203 is inserted is formed on the inner surface of the adapter body 401 behind the adapter flange 402.

Further, an insertion guide 404 that widens upward is integrally formed on the upper end surface of the adapter body 401, and the funnel-shaped inner surface of this insertion guide 404 communicates with the above-mentioned concave groove 403. . This insertion guide 404
As shown in FIG. 5, when the syringe adapter 400 is mounted in the concave portion 106 of the injection head 101, the insertion guide 11 of the cylinder holding member 111 of the injection head 101.
It is formed in a shape located at the rear of 3.

The syringe adapter 400 of this embodiment has a flange holding for elastically holding the cylinder flange 203 of the mounted syringe 200, for example, as filed by the applicant as Japanese Patent Application No. 2000-198358. A mechanism 411 is also formed. More specifically, as shown in FIG. 6, the cylinder flange 203 of the syringe 200 is
A pair of parallel linear cutouts 206 are formed on the outer peripheral portion of, and a pair of recesses 207 are formed at positions orthogonal to these cutouts 206.

The flange holding mechanism 411 comprises a pair of elastically bendable holding arms 412 having a shape corresponding to the cylinder flange 203, and these holding arms 412 are provided.
At the tip of each of the
The convex portion 413 having a shape corresponding to No. 7 is formed. Such a flange holding mechanism 411 is built in, for example, the position of the concave groove 403 of the adapter body 401 of the syringe adapter 400 (not shown).

Therefore, as shown in FIG. 6 (a), after inserting the syringe 200 into the syringe adapter 400 from above with the linear cutouts 206 of the cylinder flange 203 positioned on the left and right sides, the same figure (b) is used. ) As shown in (c), when the syringe 200 inserted in the syringe adapter 400 is rotated 90 degrees in the left-right direction, the convex portion 413 of the holding arm 412 elastically engages with the concave portion 207 of the cylinder flange 203. As a result, the syringe 200 is elastically held by the syringe adapter 400.

Further, the syringe adapter 400 of the present embodiment
Is prepared for each of a plurality of types of syringes 200 other than the maximum size as described above, but since the syringe 200 is generally prepared for a plurality of types of drug solutions, a plurality of types of the present embodiment The syringe adapter 400 corresponds to a plurality of types of chemical liquids in a one-to-one correspondence.

Therefore, the syringe adapter 400 of this embodiment
Has four predetermined positions defined on the lower surface of the adapter body 401, and as shown in FIG. 7, since at least one of the four positions is provided with a convex portion 415 as syringe identifying means, "2 ⁴ −1 = 15 ”types of syringes 20
Identification data of 0 is recorded.

In the concave portion 106 of the injection head 101, pressure switches 117 as syringe detecting means are arranged at four positions corresponding to the convex portions 415 of the syringe adapter 400. These pressure switches 117 indicate whether the convex portions 415 are present or not. Detect individually. The push switch 117 has a convex portion 415.
It consists of a simple mechanical switch that outputs a signal when pressed to, and is made of a non-magnetic material.

In addition, the syringe adapter 400 of this embodiment
Has a screw hole 417 formed at a predetermined position on the lower surface,
The head body 105 of the injection head 101 has a screw member 118 that is fastened to the screw hole 417 of the syringe adapter 400.
Is rotatably attached. This screw member 118 is
A knurled head 131 that is manually operated is formed at the lower end, and this knurled head 131 is used as the injection head 1.
No. 01 is exposed on the lower surface of the head body 105.

As shown in FIGS. 2 and 8, the ultrasonic motor 1 is provided behind the recess 106 of the injection head 101.
A slider mechanism 119 having a drive source 17 is formed.
Hold and slide. The slider mechanism 119 includes a load cell 12 made of a non-magnetic material such as phosphor bronze alloy.
0 is built in, and the load cell 120 generates an electric signal corresponding to the stress with which the slider mechanism 119 presses the piston member 202.

In the chemical injection device 100 of this embodiment, as shown in FIG. 3, an operation panel 121 is provided on the upper part of the main body 102 of the device.
And a liquid crystal display 122, and a processor unit 123 is built in the apparatus main body 102. The processor unit 123 functions as various means for integrally controlling each part of the chemical liquid injector 100 by executing various processing operations according to a computer program.

For example, when the syringe 200 is mounted on the injection head 101 via the syringe adapter 400, the processor unit 123 has four pressing switches 1
The identification data of the syringe 200 is detected from the output signal of 17. When the syringe 200 of the maximum size that does not use the syringe adapter 400 is mounted on the injection head 101, the processor unit 123 detects that none of the four pressing switches 117 detects the convex portion 415, and thus the syringe of the maximum size. 200 identification data are detected.

The processor unit 123 has 16
Various data of the syringes 200 of various types are recorded for each identification data, and when the identification data of the syringe 200 is detected from the output signal of the press switch 117 as described above,
Based on the identification data, various data of the syringe 200 are read out and displayed on the liquid crystal display 122.

Further, when the processor unit 123 detects that the syringe 200 is attached to the injection head 101 from the output signal of the pressing switch 117, the load cell 12 is returned to the initial state in which the ultrasonic motor 117 is not operating.
Obtain and hold an electrical resistance of 0.

After this acquisition is completed, the operation panel 121
When a predetermined operation is performed, the ultrasonic motor 117 of the slider mechanism 119 is driven to slide the piston member 202 of the syringe 200. At this time, the processor unit 123 acquires the electric resistance of the load cell 120 in real time, and calculates the pressure of the chemical liquid as a pressure detection means from the difference between the electric resistance and the electric resistance held in the initial state.

However, even if the stress acting on the load cell 120 is the same, the pressure of the chemical liquid differs depending on the inner diameter and sliding resistance of the syringe 200, the viscosity of the chemical liquid, etc. Therefore, the processor unit 123 uses the various data read from the syringe 200. The inner diameter value is acquired, and the pressure of the drug solution is calculated according to the various data. Further, when the pressure of the chemical liquid is calculated in real time in this way, the processor unit 123 generates a time-dependent graph of pressure in real time and displays it on the liquid crystal display 122 as pressure display means.

The chemical liquid injector 100 according to the present embodiment.
Is used near the imaging unit 301 of the MRI apparatus 300 as shown in FIG.
0 control unit 302. The control unit 302 is a computer system, which controls the operation of the imaging unit 301 and displays a tomographic image.

[Operation of Embodiment] In the case of using the chemical injection device 100 of the present embodiment with the above-described configuration, the operator selects an appropriate syringe 200 corresponding to the chemical injected into the subject. , MRI the syringe 200
An extension tube is connected to a subject located in the imaging unit 301 of the apparatus 300 (not shown). The syringe 200
Is the maximum size without using the syringe adapter 400, as shown in FIG. 1 and FIG.
Is mounted directly in the recess 106 of the injection head 101 and the piston member 202 is held by the slider mechanism 119.

In that case, as will be described later, the syringe 20
Since the pair of cylinder holding members 111 of the injection head 101 to which 0 is not attached are arranged in the open position by the bias of the bending spring, the operator (not shown) inserts the syringe 200 into the opening of the cylinder holding member 111. The cylinder flange 203 is inserted from above. At this time, since the insertion guides 113 of the pair of cylinder holding members 111 are widened to the left and right, the insertion guide 113 causes the syringe 20 to expand.
0 cylinder flange 203 is cylinder holding member 111
The groove 112 is easily inserted.

When the cylinder flange 203 of the syringe 200 is thus inserted into the cylinder holding member 111,
As shown in FIG. 3B, a pair of cylinder holding members 111
Is displaced from the open position to the closed position against the bias of the bending spring, so that the cylinder holding member 111 holds the cylinder flange 203 of the syringe 200.

Further, as described above, the cylinder holding member 11
When 1 is placed in the closed position, the holding lock member 115 slides from the release position to the holding position by the urging of the pressing spring, so that the cylinder holding member 111 is fixed in the closed position by the contact of the holding lock member 115. To be done.

At this time, since the convex portion 415 formed on the lower surface of the syringe adapter 400 is not formed on the syringe 200, even if the maximum-sized syringe 200 is directly attached to the injection head 101, four pressing portions are pressed. All the switches 117 do not detect the convex portion 415.

As described above, the syringe 2 is attached to the injection head 101.
Even if 00 is mounted, all of the push switch 117 remains
If 15 is not detected, this means that the processor unit 123 of the apparatus main body 102 has the maximum size of the syringe 200.
Get the identification data of.

Then, as shown in FIG. 10, the processor unit 123 which has acquired the identification data of the syringe 200 in this way (step S1) retrieves and holds various data of the syringe 200 from the database with the identification data (step S1). Steps S2 and S3), and at least a part of the various data is displayed on the liquid crystal display 122 of the apparatus main body 102 (step S4).

Now, the liquid crystal display 122 displays the name of the liquid medicine, the capacity of the syringe 200, etc.
The operator can confirm that the appropriate syringe 200 is attached. Then, when the operator who confirms this inputs the injection start to the operation panel 121 of the apparatus main body 102 (step S5), the processor unit 123
Load cell 1 without operating ultrasonic motor 117
20 electrical resistance is acquired and held (steps S6, S
7).

When this is completed, the processor unit 1
Since 23 operates the ultrasonic motor 117 (step S8), the slider mechanism 119 slides the piston member 202 of the syringe 200, and the medicinal solution of the syringe 200 is injected into the subject. At this time, the processor unit 123 acquires the electric resistance of the load cell 120 in real time (step S9), and based on the difference between the electric resistance and the electric resistance held in the initial state, the chemical liquid corresponding to the inner diameter value of the syringe 200 or the like. Is calculated (step S10).

Further, from this pressure, the processor unit 123 generates a time-lapse graph in real time and displays this time-lapse graph on the liquid crystal display 122 (step S12). Then, the chemical liquid injector 100 of the present embodiment is
When the completion of injection of the chemical liquid is detected from the stroke of the slider mechanism 119 (step S13), the ultrasonic motor 117
Drive is stopped to return to the initial state (step S1
4).

When the detected pressure of the chemical reaches the predetermined upper limit pressure (step S11), the processor unit 12
3 forcibly stops the driving of the ultrasonic motor 117 (step S15), and displays an error guidance such as "The above pressure has been generated, please check the syringe etc." on the liquid crystal display 122 (step S16).

When the injection of the liquid medicine by the liquid medicine injector 100 is completed, for example, the operator removes the extension tube from the subject and the syringe 200, and manually operates the operation lever 116 to retreat against the bias of the pressing spring. Let Then, as shown in FIG. 1A, since the holding lock member 115 is arranged at the release position, the pair of cylinder holding members 111 are displaced from the closed position to the open position by the bias of the bending springs. At this time, since the syringe 200 is pushed upward by the pair of displacing cylinder holding members 111, the operator holds the cylinder holding member 1
The syringe 200 is removed upward from the opening of 11.

When mounting the syringe 200 of a size other than the maximum size on the injection head 101, generally, a suitable syringe adapter 400 is mounted on the injection head 101,
The syringe 200 is attached to the syringe adapter 400. More specifically, since the pair of cylinder holding members 111 of the injection head 101 are arranged in the open position by the biasing of the bending springs as described above, the operator can move the cylinder holding members 111 to the open position as shown in FIG. The adapter flange 402 of the syringe adapter 400 is inserted into the opening from above.

Since this syringe adapter 400 corresponds to the maximum size syringe 200, the injection head 101 holds the syringe adapter 400 as in the case of the maximum size syringe 200. When the syringe adapter 400 is attached to the injection head 101 in this way, the screw member 118 of the injection head 101 and the syringe adapter 4 are attached.
Since it faces the screw hole 417 of No. 00, the operator can also fasten the screw member 118 to the screw hole 417 by manual operation to securely fix the syringe adapter 400 to the injection head 101 if desired.

When the syringe adapter 400 is attached to the injection head 101 as described above, the syringe 200 can be attached to and detached from the syringe adapter 400. At that time, the syringe holding member 1 is provided on the upper surface of the injection head 101.
Although the insertion guide 113 of 11 is projected, the insertion guide 403 of the syringe adapter 400 larger than this is located rearward, so that the operator can easily and surely receive the syringe 20.
0 cylinder flange 203 to syringe adapter 400
Can be inserted into the concave groove 403.

As described above, the syringe adapter 40
Since the identification data of the syringe 200 to be attached to 0 is recorded in the convex portion 415 on the bottom surface, when the syringe adapter 400 is attached to the injection head 101 as described above,
The convex portion 415 presses at least one of the four pressing switches 117 of the injection head 101, so that the processor unit 123 of the apparatus main body 102 causes the syringe 20 to operate.
The identification data of 0 is acquired.

When the injection of the drug solution by the drug solution injector 100 is completed, for example, the operator removes the extension tube from the subject and the syringe 200, and removes the syringe 200 with the syringe adapter 400 attached to the injection head 101. In this case, if the syringe 200 of the same size is used next time, the syringe 200 is kept attached with the syringe adapter 400 on the injection head 101.
Can be attached and detached.

[Effects of the Embodiment] In the chemical liquid injector 100 of the present embodiment, the injection head 101 is manually operated.
When the syringe 200 is inserted into the recess 106, the cylinder flange 203 is automatically held by the pair of cylinder holding members 111, and when the operating lever 116 is retracted by manual operation from this state, the pair of cylinder holding members 111 is released.
Is automatically opened. For this reason, since the syringe 200 can be easily and surely attached to and detached from the injection head 101 with one hand, the drug solution injector 100 that causes contamination in the medical field can be operated with only one hand, and the other hand can be constantly cleaned. It is possible to maintain

Moreover, when the cylinder flange 203 of the syringe 200 is inserted into the opened cylinder holding member 111 of the injection head 101 and the syringe 200 is pushed down as it is, the cylinder holding member 111 is automatically closed and fixed. 200 can be attached to the injection head 101 with one hand very easily. In particular, the cylinder holding member 111 has an insertion guide 11 that expands upward.
3 is integrally formed, the cylinder flange 203 of the syringe 200 is inserted into the concave groove 1 of the cylinder holding member 111.
12 can be easily inserted.

Further, when the cylinder holding member 111 holding the syringe 200 is opened, the displacement of the cylinder holding member 111 pushes the syringe 200 upward, so that the syringe 200 can be held from the opened cylinder holding member 111 with one hand. It can be taken out very easily.

Further, the cylinder holding member 111 is composed of a pair holding the cylinder flange 203 of the syringe 200 from both left and right sides, but since the holding lock member 115 is only one in contact with one of the pair of cylinder holding members 111, The structure for holding the cylinder holding member 111 is simple.

Then, one holding lock member 115
There is no need for a structure in which the two holding lock members 115 are individually connected to the two operation levers 116, and the two holding lock members 115 are individually connected to the two holding lock members 115.
Since a complicated structure in which one operation lever 116 is connected to 5 is not necessary, the holding lock member 115 can be operated by one hand with a simple structure.

Further, the chemical liquid injector 10 of the present embodiment.
In 0, the dedicated syringe adapter 400 is prepared for each of the plurality of types of syringes 200, so that the plurality of types of syringes 200 having various outer shapes can be uniformly attached to the injection head 101. In particular, the syringe adapter 400
Since it has an outer shape corresponding to the maximum size syringe 200, the syringe adapter 400 can be easily and surely attached / detached to / from the injection head 101 as in the case of the syringe 200 described above.

Moreover, the syringe adapter 400 can be easily and surely attached / detached to / from the injection head 101 with one hand, and the syringe 200 can be easily and surely attached / detached to / from the syringe adapter 400 attached to the injection head 101. it can. Particularly, the screw member 118 rotatably mounted on the injection head 101 is attached to the syringe adapter 4
Since it can be fastened to the screw hole 417 of No. 00, the syringe adapter 400 mounted on the injection head 101 can be securely fixed.

Further, the syringe adapter 400 elastically holds the cylinder flange 203 of the mounted syringe 200, as in the case of Japanese Patent Application No. 2000-198358, so that the syringe adapter mounted on the injection head 101 is elastically held. The syringe 200 can be reliably held by the 400.

Further, since the syringe adapter 400 is integrally formed with the insertion guide 404 that widens upward, the cylinder flange 203 of the syringe 200 can be easily inserted into the concave groove 403 of the syringe adapter 400. In particular, the injection head 101 has a syringe adapter 4
00, the insertion guide 11 of the injection head 101
Since the large insertion guide 403 of the syringe adapter 400 is located behind the syringe 3, the syringe 200 can be easily attached to the syringe adapter 400 attached to the injection head 101.

Moreover, although the syringe 200 is prepared for each of a plurality of types of chemical liquids, the maximum size of the syringe 200
Alternatively, when the syringe adapter 400 is attached to the injection head 101, the identification data of the corresponding syringe 200 is automatically detected, so that the operator does not need to input the identification data of the syringe 200 to the operation panel 121.

Furthermore, the identification data of the syringe 200 can be detected by detecting the projections 415 formed on at least a part of the prescribed four positions of the syringe adapter 400 by the pressing switch 117 of the injection head 101, which is simple. The structure can reliably detect the identification data of the syringe 200.

In particular, since the identification data of the syringe 200 is recorded in the convex portion 415 on the syringe adapter 400 that is repeatedly used, it is basically necessary to form the convex portion on the syringe 200 which is disposable and manufactured by a plurality of manufacturers. You don't have to force it. Moreover, since the convex portion 415 and the pressing switch 117 do not disturb the magnetic field unnecessarily, the MRI apparatus 30
The identification data of the syringe 200 can be detected without adversely affecting 0.

Furthermore, the syringe 200 is identified by the identification data.
Since various kinds of data are automatically searched and displayed, the operator can easily confirm whether the syringe 200 mounted on the injection head 101 is appropriate, and a medical accident in which the syringe 200 of an unsuitable drug solution is used. Can be satisfactorily prevented.

When the syringe 200 is a disposable type that is not a prefilled type, the liquid injector 100 identifies and displays that the mounted syringe 200 is disposable. But,
If various data of the liquid medicine filled in the syringe 200 at the medical site is registered in the database of the processor unit 123, the syringe 2 can be displayed on the liquid crystal display 122.
00 is disposable, and various data of the filled chemical liquid can be displayed.

Further, since the pressure of the drug solution to be injected into the subject is automatically calculated in accordance with the read various data of the syringe 200, the pressure can be detected indirectly but appropriately. it can. Furthermore, the syringe 200
Since the stress that presses the piston member 202 is detected by the load cell 120 made of a non-magnetic material, and the pressure of the drug solution to be injected is detected from the stress, the pressure sensor of the MRI apparatus 300 is not disposed inside the syringe 200. The pressure of the drug solution can be detected without unnecessarily disturbing the magnetic field.

Moreover, since the pressure of the liquid medicine thus detected is displayed in real time as a graph over time, the operator can confirm the state of the pressure of the liquid medicine injected into the subject in real time. Furthermore, since the cylinder member 201 of the syringe 200 is held by the syringe adapter 402 or the injection head 101, it is possible to prevent the cylinder member 201 from being damaged by an abnormal internal pressure.

[Modifications of Embodiment] The present invention is not limited to this embodiment, and various modifications are allowed without departing from the scope of the invention. For example, although it has been assumed in the present embodiment that the liquid injector 100 is used near the MRI apparatus 300, it may be used near a CT scanner or angio apparatus.

Further, in this embodiment, the cylinder holding member 11
Although a bending spring is provided as the opening urging means for urging the holding lock member 1 and a pressing spring is provided as the lock urging means for urging the holding lock member, the urging means may be formed by weights or magnets. Is also possible (not shown). However, if the biasing means is formed of a magnet, it may affect the magnetic field of the MRI apparatus 300. Therefore, when the chemical injection device 100 is used near the MRI apparatus 300, each biasing means is formed of a spring or a weight. Is preferred.

In this embodiment, when the syringe 200 is attached to the injection head 101 with the syringe adapter 400,
First, the syringe adapter 400 is attached to the injection head 101, and the syringe adapter 2 is attached to the syringe adapter 400.
However, for example, the syringe adapter 400 is first attached to the syringe 200 first,
The syringe 200 can be attached to the injection head 101 together with the syringe adapter 400.

Furthermore, in this embodiment, one syringe 200 is mounted in one recess 106 of the injection head 101, but a plurality of syringes 200 can be mounted in a plurality of recesses of the injection head. (Not shown).
In that case, if the type of the syringe 200 to be attached to each of the plurality of recesses of the injection head is specified, by devising the structure so that only the specific syringe adapter 400 is attached to each of the plurality of recesses, It is possible to prevent the inappropriate syringe 200 from being attached to the recess. Further, if the number of types of syringes 200 to be mounted is different for each of the plurality of recesses, the number of positions where the protrusions 415 of the syringe adapter 400 are formed and the number of pressing switches 117 for each recess are adjusted according to the number. Is preferred.

Further, in the present embodiment, in order to generate the identification data of the syringe 200, the convex portion 415 is formed on the syringe adapter 400 and the press switch 117 is mounted on the injection head 101.
Various structures can be implemented as a structure for generating 0 identification data.

Further, in this embodiment, the slider mechanism 119 is used by the load cell 120 to move the piston member 2 of the syringe 200.
Although only the stress that presses 02 is detected and converted into the injection pressure of the chemical solution, for example, the stress that pulls out the piston member 202 by the slider mechanism 119 in the load cell 120 may be detected and converted into the suction pressure of the chemical solution. It is possible.

Further, in the present embodiment, it is exemplified that various data of the syringe 200 are retrieved from the identification data of the syringe 200 automatically detected by the chemical injection device 100 and used for data display and calculation of the pressure of the chemical. , It is also possible to use it for only one of them, and it is also possible to use the identification data for other purposes. For example, the MRI apparatus 30
It is also possible to record the identification data of the syringe 200 automatically detected by the liquid injector 100 when automatically recording the work content of the medical procedure together with the date and time data by the control unit 302 of 0 and the like. .

The various means referred to in the present invention may be formed so as to realize their functions. For example, dedicated hardware for exerting a predetermined function or a predetermined function is given by a computer program. The data processing device, a predetermined function realized by the computer program in the data processing device, a combination thereof, and the like may be used.

Further, the various means referred to in the present invention need not be independent of each other, but a plurality of means are formed as one device, and some means are part of other means. It is also possible that a part of a certain means and a part of another means overlap.

[0083]

The injection head of the present invention automatically holds the cylinder flange by the pair of cylinder holding members when the syringe is inserted into the recess, and when the holding lock member is slid from this state, the pair of cylinders is held. Since the holding member is automatically opened, it is possible to easily and surely attach and detach the syringe with one hand, and for example, it is possible to always keep the other hand clean at the medical site.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a state where a syringe is attached to and detached from an injection head according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an external appearance of a state where a syringe is attached to and detached from an injection head.

FIG. 3 is a perspective view showing the external appearance of a chemical injection device.

FIG. 4 is a perspective view showing an appearance of a state in which a syringe is attached to an injection head via a syringe adapter.

FIG. 5 is a perspective view showing an external appearance of a state where a syringe is attached to and detached from a syringe adapter attached to an injection head.

FIG. 6 is a rear view showing a state in which the cylinder flange of the syringe is elastically held by the flange holding mechanism of the injection head.

FIG. 7 is a vertical sectional side view showing a state in which the syringe is mounted on the injection head.

FIG. 8 is a block diagram showing a circuit structure of the chemical liquid injector.

FIG. 9 is a perspective view showing the appearance of an MRI apparatus.

FIG. 10 is a flowchart showing a processing operation of the chemical liquid injector.

[Explanation of symbols]

100 chemical injection device 101 injection head 105 head body 106 recess 111 Cylinder holding member 115 Holding lock member 117 Press switch as syringe detection means 118 screw member 200 syringes 201 Cylinder member 202 Piston member 300 MRI device 400 syringe adapter 402 Adapter flange 404 Insertion guide 415 Convex part that serves as syringe identification means 417 screw holes

Claims (8)

[Claims] 1. At least the cylinder flange and the piston flange of a syringe in which a piston member having a piston flange formed at the terminal outer periphery is slidably inserted into a cylinder member having a cylinder flange formed at the terminal outer periphery. An injection head for holding and moving relative to each other, the head body having a concave portion on the upper surface in which the cylinder member is disposed, an open position for opening the cylinder flange and inserting the cylinder flange, and the cylinder. A pair of cylinder holding members that are displaceable to a closed position that holds the flange from both sides orthogonal to the axial direction, opening urging means that urges the cylinder holding members to the open position, and the cylinder in the open position. The cylinder holding member in the releasing position and the closing position in which the holding member abuts on the holding member in the axial direction is in the axial direction. Injection head having a holding lock member that is slidable in the axial direction at a holding position that abuts from the orthogonal direction, and a lock urging means that urges the holding lock member to the holding position. . 2. The injection head according to claim 1, wherein one holding lock member is arranged only at a position where it abuts on one of the pair of cylinder holding members. 3. The syringe has a plurality of sizes, and an adapter flange having the same shape as the cylinder flange of the maximum size syringe is formed on the outer periphery of the end, so that the plurality of types of syringes other than the maximum size are individually formed. It has a plurality of types of syringe adapters that are detachably mounted, the head body, the cylinder member of the syringe of the maximum size and the syringe adapter are arranged in the recess in the same manner, the cylinder holding member, The injection head according to claim 1 or 2, which holds the maximum size of the cylinder flange and the adapter flange in the same manner. 4. The syringe adapter is provided with a syringe identification means in which identification data for each type of the syringe is recorded, and syringe detection means for detecting the identification data from the syringe identification means of the syringe adapter. The injection head according to claim 3, wherein the injection head is provided. 5. A screw hole is formed in the syringe adapter at a position where it abuts a recess of the head body, and a screw member fastened to the screw hole of the syringe adapter is rotatably mounted on the head body. Claim 3
Or the injection head according to 4. 6. The injection head according to any one of claims 3 to 5, wherein the syringe adapter is integrally formed with an insertion guide that widens upward at a position where the cylinder flange is inserted. 7. A syringe in which a piston member having a piston flange formed at the terminal outer periphery is slidably inserted into a cylinder member having a cylinder flange formed at the terminal outer periphery is provided with at least the cylinder flange and the piston flange. 7. A drug solution injecting device, which has an injecting head that is held separately and relatively moves, and injects at least the drug solution of the syringe into a subject by this injecting head, and the injecting head according to claim 1. A liquid medicine injection device having an injection head. 8. A syringe adapter for adapting syringes of a plurality of sizes in which a piston member is slidably inserted into a cylinder member having a cylinder flange formed on the outer periphery of the distal end to an injection head of a chemical liquid injector. A syringe adapter integrally formed with an insertion guide that widens upward at a position where the cylinder flange is inserted.