JP6250291B2 - Flange holding mechanism and chemical injection device provided with the same - Google Patents

Description

  The present invention relates to a mechanism for holding a flange at the end of a piston member of a syringe, and in particular, the flange can be held by a simple operation and, after being held, the flange can be held more stably. It is related with the flange holding mechanism which can do. The present invention also relates to a chemical liquid injector provided with the flange holding mechanism.

  Currently, CT (Computed Tomography) scanner, MRI (Magnetic Resonance Imaging) apparatus, PET (Positron Emission Tomography) apparatus, and DSA (Angiographic apparatus, Digital Subtraction) are known as medical diagnostic imaging apparatuses. . When such an imaging apparatus is used, a contrast medium, physiological saline, or the like (hereinafter simply referred to as “medical solution”) may be injected into the patient. Various proposals have been made.

  As for the chemical syringe, the pre-filled chemical solution is called a “prefilled syringe”. On the other hand, in a facility such as a hospital, a chemical solution may be sucked into an empty syringe and used. Any of the syringes can be used by being attached to the above-described chemical liquid injector.

  Patent Document 1 discloses a chemical liquid injector that includes a pair of claws for holding a flange at the end of a piston member of a syringe. In the configuration of this document, each claw portion is rotatably supported by a predetermined support shaft and is urged in a closing direction by a spring or the like.

International Publication No. 2008/004669

  Also in the conventional flange holding mechanism like patent document 1, it is possible to hold | maintain a piston flange favorably practically. However, the mechanism for holding the piston flange is used not only for the chemical liquid injection device but also for various other medical devices, and it is desirable that the piston flange can be held by a simple operation and can be held more stably.

  Accordingly, the present invention has been made in view of the above problems, and the object thereof is to maintain a flange that can hold the piston flange with a simple operation and can hold the flange more stably. To provide a mechanism. Another object is to provide a chemical injection device provided with the flange holding mechanism.

The flange holding mechanism according to an embodiment of the present invention for solving the above-described problems is as follows:
1. A flange holding mechanism for detachably holding a piston flange at the end of a piston member of a syringe,
A pair of claws that sandwich the piston flange from both sides, and a clamping member having an elastically deformable connection that connects the claws;
A holder member for holding the clamping member;
With
The clamping member is
(A) It can be transformed into a first form in which the pair of claws are open and a second form in which the connection part is elastically deformed to close the pair of claws,
(B) By pressing the piston flange and the clamping member against each other, the first form is transformed into the second form,
(C) A flange holding mechanism configured to prevent the piston flange from being detached from the clamping member even if the piston member is pulled with the pair of claws closed.

  ADVANTAGE OF THE INVENTION According to this invention, a flange holding mechanism etc. which can hold | maintain a piston flange by simple operation and can hold | maintain the flange more stably after hold | maintaining can be provided.

It is a perspective view of the chemical injection device concerning one embodiment. It is a figure which shows an example of the syringe and branch tube with which the chemical | medical solution injection apparatus of FIG. 1 is mounted | worn. It is a perspective view of the flange holding mechanism of the chemical injection device of FIG. It is a disassembled perspective view of the flange holding mechanism. It is a figure which shows the shape of the clamping member of a flange holding mechanism (open state). It is a figure which shows the shape of the clamping member of a flange holding mechanism (closed state). It is a figure which shows the flange holding mechanism of other embodiment. It is a figure which shows the flange holding mechanism of other embodiment. It is a figure which shows the chemical | medical solution injection apparatus (injection head) of other embodiment. It is a perspective view which shows the other example of a syringe. It is a perspective view which shows another example of a syringe. It is a figure which shows the other example of a branch tube.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings, structural portions having the same function are denoted by the same or corresponding reference numerals. In the following description, terms indicating directions such as up, down, left, and right are used, but these do not limit the present invention.

[First Embodiment]
FIG. 1 shows a chemical liquid injector 201 according to this embodiment.

(Syringe)
The syringe attached to the chemical liquid injector 201 shown in FIG. 1 may be a conventionally known syringe as shown in FIG. Syringes 500A and 500B (hereinafter also simply referred to as syringe 500) have a hollow cylinder member 501 and a piston member 502 slidably inserted into the cylinder member. The piston member 502 may be rod-shaped as a whole and may have a plunger formed at the tip, or may be provided with a plunger at the tip and a rod member separately (so-called rodless type). ).

  A piston flange 502 a is formed at the end of the piston member 502. The piston flange 502a is a flat plate member, for example, and may be a disk-shaped member. The cylinder member 501 is a cylindrical member that is closed at the distal end side and opened at the proximal end side, and a cylinder flange 501a is formed at the proximal end portion. The cylinder flange 501a is also a flat plate member as an example, and specifically, may be a substantially disk-shaped member. A conduit portion 501b to which the branch tube 508 is connected is formed at the distal end portion of each syringe 500.

  The cylinder flange and / or the piston flange may have a so-called I-cut shape in which the left and right sides of the outer peripheral portion of the flange are cut off. Alternatively, it may be oval instead of perfect circle.

  In addition, as a syringe, what is specifically shown to FIG. 9A (a), (b) may be sufficient, and this syringe is for 100 ml, for example. This syringe includes a cylinder member 501 and a piston member 502. A cylinder flange 501a of the cylinder member 501 has an I-cut contour shape, and two notches 505 (only one of them is provided on the outer peripheral portion of the flange 501a. Is formed). The conduit portion 501b at the tip of the cylinder member 501 may be for luer lock connection having two inner and outer cylindrical portions arranged coaxially. As shown in FIG. 9A (b), a ring-shaped protrusion 501c may be formed on the rear surface of the cylinder flange 501a. Similarly, the other of the two syringes may be a syringe as shown in FIGS. 9B (a) and (b), and this syringe is for 200 ml, for example. Similarly to the above syringe, this syringe also includes a cylinder member 501 and a piston member 502, and the cylinder flange 501a of the cylinder member 501 may have an I-cut contour. Two notches 505 (only one is shown) are formed on the outer periphery of the cylinder flange 501a. The conduit portion 501b at the tip of the cylinder member 501 may be for luer lock connection having two inner and outer cylindrical portions arranged coaxially. As shown in FIG. 9B (b), a ring-shaped protrusion 501c and a plurality of ribs 501d extending outward from the protrusion 501c may be formed on the rear surface of the cylinder flange 501a. In FIG. 9B, the cylinder flange 501a is illustrated with both the notch 505 and the rib 501d formed, but only one of them may be formed.

  An example of the branch tube 508 may be as shown in FIG. 9C. The branch tube 508 has three tubes connected via a T-shaped connector. Connection connectors 509 and 509 are attached to the end of the tube connected to each syringe, and another form of connection connector 510 is attached to the end of the tube toward the patient. Each connection connector 509 may have a cylindrical portion 509a having a screw portion 509b formed at the tip, and may be connected to the syringe conduit portion 501b by a luer lock method. Further, the connection connector 509 may have a function as a one-way valve, in particular, as disclosed in WO2012 / 060365. For example, the connection connector 510 may be connected to a catheter or an indwelling needle (not shown).

  The drug solution in the syringe is not limited, but one syringe is filled with contrast medium and the other is filled with physiological saline, or both syringes are filled with contrast medium (different concentrations). Also good. As the contrast agent, for example, a contrast agent for CT examination or an angiography contrast agent can be used.

  The syringe 500 may be a prefilled type that is pre-filled with a chemical solution, or may be a suction type that uses a syringe after the chemical solution is sucked into the syringe. In FIG. 2, the branch tube 508 is already connected to the tip of the syringe 500, but after the chemical solution is sucked through another chemical solution tube (not shown), the branch tube 508 is connected as shown in FIG. 2. It may be.

  One or both of the cylinder member 501 and the piston member 502 may be made of a resin material. Depending on the application, the cylinder member 501 may be made of, for example, glass. When the chemical solution is injected at a high pressure, a protective cover that covers the outside of the cylinder member 501 may be used. Similar to the cylinder member, the protective cover may be a cylindrical member that is closed on the distal end side (except in the vicinity of the conduit portion 501b) and opened on the proximal end side.

For example, an IC tag 503 (for example, an RFID tag) may be provided on a part of the syringe as shown in FIG. The IC tag can be provided on the outer periphery of the cylinder member or on the cylinder flange. For example, the IC tag 503 may have the following data:
-Chemical type, manufacturer, product number, viscosity, etc. If it is a contrast agent, its iodine-containing concentration.
-A unique identification number such as the manufacturer, product number, and serial number of the syringe as data on the syringe. Syringe capacity, piston stroke, service life (number of times), number of uses, etc.
-An appropriate combination of some of these data.

(Chemical injection device)
As illustrated in FIG. 1, the chemical liquid injector 201 includes an injection head 210 and a console 240 for controlling the operation thereof. The connection between the injection head 210 and the console 240 may be a wired connection or a wireless connection. If there is no wireless antenna in the injection head 210, it may be connected via a separate relay wireless antenna (not shown) connected to the injection head 210. When the relay radio antenna (not shown) is composed of a pair of units, one unit is connected to the injection head 210 (for example, wired) and the other unit is connected to the console 240 (for example, wired). Also good. As another example, the other unit may be integrated outside the console 240 or incorporated inside. Further, the injection head 210 may include an IC tag reader / writer that reads / writes from / to the IC tag of the syringe as necessary.

  The injection head 201 has a recess 214 for attaching the syringe 500 (FIG. 2), and the syringe 500 is detachably attached thereto. The recess 214 may have a shape recessed in a substantially semi-cylindrical shape. In this example, the syringe 500 is mounted via an adapter 232A or an adapter 232B (hereinafter also simply referred to as an adapter 232). The adapter 232 is formed in a substantially U shape as a whole, and is configured to hold at least the cylinder flange 501 a of the cylinder member 501 and be attached to a part of the recess 214. One adapter 232A and the other adapter 232B may be the same or different.

  The adapter may be used to allow a plurality of types of syringes having different sizes (diameters) to be attached, but may be used for other purposes.

  The injection head 201 includes two systems of piston drive mechanisms 230 and 230 that can operate independently. The piston drive mechanism 230 includes a drive source (not shown) housed in the casing of the injection head 201, a link mechanism (not shown) that transmits a drive force from the drive source, and a drive transmitted by the link mechanism. And a ram 231 that reciprocates in the front-rear direction under force. A flange holding mechanism 120 (detailed below) according to an embodiment of the present invention is attached to the tip of the ram 231.

  The drive source may be a motor (not shown), for example, and more specifically, a nonmagnetic motor such as an ultrasonic motor may be used. Control of the operation of the piston drive mechanisms 230, 230 may be performed by a control circuit of the console 240, or may be performed by a control circuit provided in the injection head 201.

  A load cell for detecting how much force pushing the piston member 502 (FIG. 2) may be arranged at the tip of the ram 231. Instead of the ram 231, a load cell may be provided in a part of the flange holding mechanism 120. For example, the load cell may be provided at a position where the back surface of the connecting portion 124 (details will be described later) is pressed against.

  Instead of using a load cell, the injection pressure may be calculated based on a load applied to the motor (for example, a motor current). In this case, the result may be displayed on a display near the head or a display on the console. Regarding the display format, for example, the pressure may be displayed in real time as a graph with the horizontal axis representing time and the vertical axis representing pressure. Note that the connection between the console and the injection head may be a wired connection or a wireless connection, and the arrangement position of the console may be either inside the imaging room or outside the imaging room.

  The injection head 210 is provided with a physical button for appropriately operating each piston drive mechanism 230. Although not limited, in this example, physical buttons are arranged not only on the top surface of the injection head 210 but also on the side surface. The injection head 210 may be used by being held on a movable stand, for example. As a movable stand, a rod-shaped pole member may be erected on a base portion having a plurality of casters, and an injection head 210 may be attached to an upper portion of the pole member. Alternatively, the injection head 210 may be supported by a ceiling arm assembly attached to the ceiling. The ceiling suspension arm assembly may have a base portion fixed to the ceiling and an articulated arm portion extending from the base portion. The movable stand or the suspension arm assembly may support the injection head 201 so as to be rotatable (for example, around a horizontal axis). Further, the movable stand or the ceiling suspension arm assembly may support the injection head 201 so as to be rotatable around a vertical axis. The rotation around the horizontal axis and the rotation around the vertical axis may be used in appropriate combination.

  Although not shown in detail, the console 240 includes, for example, a display for displaying various information, an input device such as a button and / or a hand switch, and a control circuit. The console 240 is connected to the injection head 210 by a cable as an example, and controls the operation of the injection head 210. The console 240 may be placed inside the imaging room in which the injection head 210 is disposed or may be placed outside. The control circuit (not shown) of the console 240 may include a calculation unit such as a CPU and a storage unit that stores predetermined data.

The data held by the storage unit is not limited, but may be as follows:
-Injection protocol (eg, time-injection rate relationship, time-injection amount relationship, contrast agent amount, injection time, etc.)
-Patient physical information (weight, height, gender, age, etc.)
-Imaging part

  The above data may be stored in a storage medium that can be attached to and detached from the console. In this case, for example, a password may be set in order to prevent overwriting and / or rewriting of data.

(Flange holding mechanism)
Hereinafter, the flange holding mechanism 120 of this embodiment will be described with reference to FIGS.
The flange holding mechanism 120 includes a clamping member 125 that holds the piston flange 502a (FIG. 2) and a holder member 130 that holds the clamping member 125. The clamping member 125 and / or the holder member 130 may be made of a nonmagnetic material or may be made of a magnetic material.

  As shown in FIG. 4, the clamping member 125 is a single component having a pair of claw portions 123 and 123 that sandwich the piston flange 502 a (FIG. 2) from both sides and a connection portion 124 that connects the claw portions 123 together. is there. In this example, the holder member 130 is composed of two parts divided vertically (FIG. 4), and the lower holder member 132 is attached to the upper holder member 131. The holder member 130 also has two support pins 136, and these support pins 136 are passed through elongated holes (detailed below) formed in the claw portion 123.

  Both the clamping member 125 and the holder member 130 may be made of resin. Alternatively, at least one of both members may be made of resin and the other may be made of metal. In the case of resin, for example, POM and ABS may be used, or an elastic material such as elastomer may be included at least in part. The thickness of the connection part 124 may be, for example, about 0.5 mm to 2 mm. The width dimension of the clamping member 125 (the vertical dimension in FIG. 3) may be smaller than the diameter of the piston flange 502a, and may be, for example, about half or less of the same diameter. The support pin 136 may be made of resin or metal, for example.

  The clamping member 125 has a generally U-shaped (U-shaped) shape as a whole. The left and right claw portions 123 and 123 have sufficient rigidity so that the piston flange 502a can be satisfactorily gripped. On the other hand, the intermediate connection portion 124 is formed in a curved plate shape that can be elastically deformed.

  As shown in FIG. 5A, the pair of claw parts 123 and 123 have tapered surfaces 123c and 123c that narrow toward each other downward (toward the claw base side). The tapered surfaces 123c and 123c function as guide surfaces for the piston flange 502a, as will be described later. As clearly shown in FIG. 3, when a concave portion curved in an arc shape is formed on the tapered surface 123c, the piston flange 502a can be guided better.

Referring to FIG. 5A again, in this example, the vicinity of the lower portion of the tapered surfaces 123c, 123c is the narrowest portion d ₁₂₅ between the claw portions 123. The dimension of the narrowest part d ₁₂₅ is set smaller than the diameter of the piston flange 502a.

  Although not limited, the surface 123a extending further downward from the lower end of the tapered surface 123c may be a substantially straight surface in the vertical direction in the state of FIG. 5A. A concave portion that is curved in an arc shape may be formed on the surface 123a, similarly to the tapered surface 123c.

  Specifically, the connecting portion 124 is formed in a substantially arc shape that protrudes upward as shown in FIG. 5A. As will be described later, the connecting portion 124 is deformed from the state shown in FIG. 5A to the state shown in FIG. 5B by being pushed downward from above, and rotates each claw portion 123 around the substantially supporting pin 136. It is a structural part for closing the claw part 123.

  A long hole 123h is formed in each claw portion 123 so that the pair of claw portions 123 and 123 are closed when the connection portion 124 is pushed. The long hole 123h includes a first portion where the pin member 136 is located in the state of FIG. 5A, a second portion where the pin member 136 is located in the state of FIG. 5B, and an intermediate portion connecting the two portions. It is formed into a shape. In this example, as shown in FIG. 5A, the long hole 123h is formed in a “<” shape as a whole (a shape in which the first line segment and the second line segment intersect at an angle of about 120 °). Has been.

  As long as the connection part 124 fulfill | performs the above functions, the shape may be changed suitably. A linear or dot-like protrusion 124 a may be formed on the upper surface of the connection part 124. There may be only one protrusion 124a, or one protrusion on each side as shown in FIG. 5A. Or you may form in three or more places on an upper surface. In the present embodiment, as shown in FIG. 3, protrusions 124 a are formed as two left and right ribs. As will be described later, the protruding portion 124a is a portion that abuts on the back surface of the piston flange 502a.

  The holder member 130 is not limited to the shape shown in FIG. 5A as long as it has the support pins 136 and 136 and can stably hold the clamping member 125, and may have any shape. When the upper holder member 131 is shaped to cover at least a part of the clamping member 125 and / or at least a part of the internal structure, the liquid medicine (saline solution and / or contrast medium) in the syringe leaks from the syringe. Even if it is, it is preferable at the point which can prevent permeation of a chemical | medical solution.

  As shown in FIG. 5A, the holder member 130 preferably has a fixing member S1 for connection with another member (in this embodiment, the ram 231 of the piston drive mechanism). The fixing member S1 may be, for example, a screw. Specifically, the fixing member S1 is passed through a through hole 135 (FIG. 4) penetrating the main body of the holder member 130 in the vertical direction (direction parallel to the ram). The fixing screw S1 may be arranged so that the screw tip protrudes by a predetermined length. The fixing screw S1 may be disposed on the axis of the ram 231 (FIG. 1).

  In such a configuration, the flange holding mechanism 120 can be connected to the ram 231 with only one fixing screw S1.

  In addition, it is also preferable that the head of the fixing screw S1 is configured not to protrude from the peripheral wall portion of the holder main body portion. The fixing screw S1 may be a non-magnetic material as necessary. The fixing screw S1 is an example and may be a flat head screw having a substantially conical head.

In consideration of the deformation of the connecting portion 124 into the shape as shown in FIG. 5A and the shape as shown in FIG. 5B in this embodiment, it is also preferable that one or more of the following configurations are adopted:
A load cell (not shown) is incorporated on the rear side of the connection 124.
A switch (not shown) is incorporated on the rear side of the connection 124; For example, the switch is OFF when (i) the connecting portion 124 is not deformed to a predetermined position, and (ii) is pressed by the connecting portion when the connecting portion 124 is deformed to a predetermined position. It may be such that it becomes ON.
-It is incorporated in the rear surface side of the displacement sensor (for example, optical sensor) connection part 124 that detects the distance to the object.
The predetermined control circuit compares the detection result with a predetermined set value based on the signal from the load cell, switch and / or proximity sensor, and the connection unit 124 is transformed into a desired form (in other words, If so, it is determined whether the syringe is properly held. As the predetermined control circuit, the console 240 (FIG. 1) may be included, or the injection head 210 may be included. The load cell may be such that the pressure can be measured during injection.

  In order to reduce the size of the clamping member 125 (the lateral size in FIG. 5A) when each claw 123 is further opened from the state shown in FIG. May have been deleted.

  Next, the operation of the flange holding mechanism 120 of this embodiment will be described below. In the following description, the piston member 502 is pushed toward the clamping member 125, but in actuality, the flange holding mechanism 120 is moved to the piston flange 502 by the piston drive mechanism 230 (FIG. 1). It will be approaching.

  First, as shown in FIG. 5A, the piston member 502 gradually approaches the flange holding mechanism 120, and the outer peripheral portion of the piston flange 502 a comes into contact with the tapered surfaces 123 c and 123 c of the pair of claw portions 123 and 123.

  In this state, when the piston flange 502a is further pushed in (when the flange holding mechanism 120 is further advanced with respect to the fixed piston flange 502a), the outer periphery of the piston flange 502a exceeds the connection portion between the tapered portion 123c and the surface 123a. The piston flange 502a is sandwiched between the surfaces 123a and 123a.

  Next, when the state shown in FIG. 5B is pushed in, the connecting portion 124 is pushed by the piston flange 124 and elastically deformed so as to be substantially flat, and each claw portion 123 rotates about the pin member 136 along with the deformation. Thus, the pair of claws 123 and 123 are closed. As a result, the piston flange 502a is gripped by the pair of claw portions 123, 123.

  Once the piston flange 502a is held as shown in FIG. 5B, (i) the connecting portion 124 is pressed against the back surface of the piston flange 502a, and (ii) the claw member 123 is locked. Since the portion 123b is locked to the upper surface of the piston flange 502a, the piston flange 502a is stably and firmly fixed in the clamping member 125.

  The protrusions 124a and 124a formed on the connection portion 124 abut against the back surface of the piston flange 502a, and promote the connection portion 124 to be flatter. As a result, the pair of claw parts 123 and 123 are closed on the inside. In the state of FIG. 5B, the support pin 136 is locked to the end of the long hole 123h, so that the vertical position of the clamping member 125 (the axial direction of the piston member) is also fixed. The

  It is also preferable that the clamping member 125 is configured so that a click feeling is obtained when the piston flange 502a is locked by the clamping member 125. Thereby, the user can know by sound and / or touch that the piston flange 502a is normally locked.

  When removing the syringe, the following procedure may be performed as an example. That is, the piston flange 502a can be removed from the clamping member 125 by sliding the entire syringe in the lateral direction (the vertical direction in FIG. 5). After removing the piston flange 502a, the clamping member 125 is restored to its original shape (FIG. 5A).

  Through the series of operations as described above, the piston flange 502a of the piston member 502 and the clamping member 125 can be connected and the syringe 500 can be removed.

  According to the flange holding mechanism 120 of the present embodiment as described above, the piston flange 502a is firmly held by the clamping member 125 simply by moving the syringe 500 or the flange holding mechanism 120 linearly so as to approach each other. In addition, even if the piston member 502 is pulled back, the piston member 502 is not detached from the clamping member 125.

  In addition to the holding by the pair of claws 123, 123, the flange holding mechanism 120 is such that a part of the connecting portion 124 (in this example, the protruding portion 124a) comes into contact with the back surface of the flange, so that the piston flange 502a is more stable. Will be held.

  In the case where the clamping member 125 is a single part in which the pair of claw parts 123 and 123 and the connection part 124 are integrally formed, the part is compared with a case where a spring or the like is used to bias the claw part 123. The number of points can be reduced and the mechanism can be simplified. Further, for example, when the syringe is attached or detached, the contrast agent or physiological saline may leak and adhere to the flange holding mechanism 120. In such a case, in the configuration using a spring or the like to bias the claw portion 123, there is a possibility that the contrast agent or physiological saline may adhere to the spring or the like and the spring or the like may not operate normally. When the elastic force of the clamping member 125 itself is used as in the form, normal operation can be maintained even if a contrast medium or physiological saline is attached.

  The fact that the number of parts can be reduced and the mechanism can be simplified as described above is advantageous in reducing the weight of the entire flange holding mechanism 120. In addition to the injection head as shown in FIG. 1, the lightweight flange holding mechanism 120 can be suitably used for a relatively small and lightweight syringe pump (one example).

[Second Embodiment]
The flange holding mechanism of the present invention may be as shown in FIGS. The flange holding mechanism 20 includes a clamping member 25 and a holder member 27 on which the clamping member 25 is disposed.

  The clamping member 25 has a plate-like connecting portion 24 that can be elastically deformed, and a pair of claw portions 23 formed at both ends thereof. As an example, the clamping member 25 may be a single component in which the connection portion 24 and the pair of claw portions 23 are integrally formed.

  The clamping member 25 has a shape as shown in FIG. 6A in a state where no external force is applied, that is, the connecting portion 24 curves upward in an arc shape, and the claw portions 23 on both sides spread slightly outward. It is in such a state. The connecting portion 24 does not necessarily have a complete arc shape, and may have a shape in which an arc portion and a straight portion are combined.

  Although not illustrated in FIG. 6, one or more ribs or one or more protrusions may be formed on the upper surface of the connection portion 24 as necessary.

  As shown in FIG. 6A, the holder member 27 has a base portion 27s on which the clamping member 25 is placed, and side walls 27a that rise upward from both ends thereof. The pressing portion 27b protrudes inward.

  As an example, as shown in FIG. 7, the holder member 27 is such that a wall member is attached to the side surface (front surface), thereby forming a space for accommodating the clamping member 25 therein. Also good.

  When the piston flange 502a is moved downward from the state of FIG. 6 (a) as shown in FIGS. 6 (b) and 6 (c), first, the outer periphery of the piston flange 502a is located inside each claw 23. The piston flange 502a is gradually pushed into the clamping member 25 while the claws 23 are slightly expanded outward.

  6C, the connecting portion 24 is pushed by the piston flange 502a and elastically deformed so as to be substantially flat. By this deformation, each claw portion 23 is closed inside, and the piston flange is closed. Hold 502a. In this state, the inner locking surface 23b of each claw 23 is locked to the upper surface of the piston flange 502a, and a part of the connecting portion 24 is firmly in contact with the lower surface of the piston flange 502a. The flange 502a is locked by the clamping member 25.

  As shown in FIG. 6 (c), in this example, a tapered surface 23d is formed on the outer end portion of the claw portion 23, and the tapered surface 23d abuts against the pressing portion 27b of the holder 27, thereby clamping. The member 25 is prevented from being detached from the holder 27. Further, when the piston member 502 is pulled, the pair of claw portions 23 and 23 are further closed by the taper surfaces 23d of the claw portions 23 coming into contact with the pressing portion 27b, so that the piston flange 502a. Is more reliably prevented from coming off from the clamping member 25.

  In order to remove the piston flange 502a from the clamping member 25, the entire syringe may be slid in the lateral direction (that is, the direction perpendicular to the paper surface of FIG. 6). When the piston flange 502a is detached from the clamping member 25, the clamping member 25 returns to its original shape as shown in FIG.

[Other forms]
The present invention is not limited to the one described above, and various modifications can be made as follows, for example:
(A1) In the above, a two-cylinder injection head equipped with two syringes has been illustrated. For example, a piston drive mechanism 230 ′ of a one-cylinder injection head 201 ′ as shown in FIG. You may have the flange holding mechanism 120 which concerns on one form.
(A2) Although the example in which the syringe is mounted via the adapters 232A and 232B has been described above, the syringe may be directly mounted without using the adapter.
(A3) In the above description, the chemical solution injection device including the injection head and the console is exemplified. However, as the “chemical solution injection device”, any syringe can be used as long as it has at least a function of pushing out the chemical solution in the syringe. It may be anything. For example, it may be a single injection head.
(B1) In the above description, the clamping member in which the pair of claw portions and the connection portion are integrally formed has been illustrated (see, for example, FIG. 5), but these may be configured separately.
(B2) In the above description, the connecting portion of the clamping member is substantially flat in the state of FIG. 5B, but may be curved in the state of FIG. 5B.
(C) In the above description, the chemical liquid injector is exemplified as the one using the flange holding mechanism. As this chemical | medical solution suction device, the syringe holding | maintenance mechanism holding a syringe and the flange holding | maintenance mechanism for fixing the piston flange of the piston hold | maintained by it are provided, for example. After setting the syringe, the drug solution is sucked into the syringe by pulling the piston member manually or automatically by a predetermined drive mechanism.
(D) The flange holding mechanism of the present invention can also be used for a syringe pump or the like.

This application discloses the following inventions:
1. A flange holding mechanism for detachably holding a piston flange at the end of a piston member of a syringe,
A clamping member (125) having a pair of claws (123) sandwiching the piston flange from both sides, and an elastically deformable connection (124) for connecting the claws (123);
A holder member (130) for holding the clamping member (125);
With
The clamping member (125)
(A) Deformation into a first form in which the pair of claws (123) is open and a second form in which the connection part (124) is elastically deformed and the pair of claws (123) is closed. Is possible,
(B) By pressing the piston flange and the clamping member (125) together, the first form is transformed into the second form,
(C) A flange holding mechanism configured to prevent the piston flange from being detached from the clamping member (125) even if the piston member is pulled with the pair of claws (123) closed.

2. The flange holding mechanism described above, wherein the piston flange is configured to be detachable from the clamping member (125) by sliding the piston member laterally.

3. The flange holding mechanism as described above, wherein the connecting portion (124) is curved in a substantially arc shape.

4). The said holding | maintenance part (124) is a flange holding mechanism of the said description which has a 1 or several protrusion part (124a) in the surface facing the said piston flange.

5). The pair of claws (123) are formed with tapered surfaces (123c) that face each other and narrow toward each other toward the base of the claws,
The flange holding mechanism according to the above, wherein the distance (d ₁₂₅ ) between the narrowest portions of the pair of claws (123) is designed to be smaller than the outer diameter of the piston flange (502a) to be held.

6). The flange holding mechanism according to the above, wherein the pair of claws (123) has a locking surface (123b) that is substantially parallel to the upper surface of the piston flange when the claws are closed.

7). The holder member (130) is provided with a support pin (136),
A long hole (123h) is formed in the claw portion of the clamping member,
The flange holding mechanism according to the above, wherein the claw portion (123) is attached to the holder member by passing the support pin through the long hole.

8). The flange holding mechanism according to the above, wherein the holder member (130) further includes a fixing member (S1) for connection with another member.

9. A syringe holding unit for holding the syringe;
A piston drive mechanism for moving the piston member of the syringe;
A chemical injection device comprising:
A chemical injection device, wherein the piston drive mechanism has the flange holding mechanism described above.

10. As the piston drive mechanism,
A first piston drive mechanism for holding a piston member of the first syringe;
A second piston drive mechanism for holding the piston member of the second syringe,
A chemical injection device, wherein at least one of the piston drive mechanisms has the flange holding mechanism described above.

11. The chemical injection device according to the above, wherein a load cell is provided in the piston drive mechanism or the flange holding mechanism.

12 The chemical injection device according to the above, comprising a displacement sensor for detecting a distance to the connection portion of the flange holding mechanism.

13. The chemical injection device according to the above, further comprising a switch that comes into contact with the connection portion of the flange holding mechanism to detect whether the connection portion is in a predetermined position.

14 The chemical injection device according to the above, further comprising a control circuit that performs an operation based on a signal from the load cell, the displacement sensor, or the switch.

15. The above-described chemical injection device to which the syringe filled with a contrast agent is attached.

16. The chemical injection device according to the above, wherein an IC tag is attached to the syringe.

20 Flange holding mechanism 23 Claw portion 24 Connection portion 25 Clamping member 27 Holder member 27a Side wall 27b Holding portion 27s Base portion 120 Flange holding mechanism 123 Claw portion 123a Surface 123b Locking portion 123c Tapered surface 124 Connection portion 124a Protruding portion 125 Clamping Member 130 Holder member 136 Support pin 201 Chemical solution injection device 210 Injection head 214 Recess 230 Piston drive mechanism 231 Ram 232 Adapter 240 Console 500 Syringe 501 Cylinder member 502 Piston member 502a Piston flange 508 Branch tube S1 Fixing screw

Claims (17)

A flange holding mechanism for detachably holding a piston flange at the end of a piston member of a syringe,
A clamping member having a pair of claw portions sandwiching the piston flange from both sides and an elastically deformable connection portion for connecting the claw portions, and having a fixed rotation center with respect to rotation of the claw portions. Clamping members that are not
A holder member for holding the clamping member;
With
The clamping member is
(A) It can be transformed into a first form in which the pair of claws are open and a second form in which the connection part is elastically deformed to close the pair of claws,
(B) When the piston flange and the clamping member are pressed against each other, the claws are rotated while the gap between the claws is widened, whereby the first form to the second form. Transformed into
(C) Even if the piston member is pulled with the pair of claws closed, the piston flange is configured not to be detached from the clamping member.
Flange holding mechanism. A flange holding mechanism for detachably holding a piston flange at the end of a piston member of a syringe,
A pair of claws that sandwich the piston flange from both sides, and a clamping member having an elastically deformable connection that connects the claws;
A holder member for holding the clamping member;
With
The clamping member is
(A) It can be transformed into a first form in which the pair of claws are open and a second form in which the connection part is elastically deformed to close the pair of claws,
(B) By pressing the piston flange and the clamping member against each other, the first form is transformed into the second form,
(C) Even if the piston member is pulled with the pair of claws closed, the piston flange is configured not to be detached from the clamping member,
further,
A support pin is provided on the holder member, and a long hole is formed in the claw portion of the clamping member, and the claw portion is attached to the holder member by passing the support pin through the long hole. Being
Flange holding mechanism.   The flange holding mechanism according to claim 1 or 2, wherein the piston flange is configured to be detachable from the clamping member by sliding the piston member in a lateral direction.   The flange holding mechanism according to any one of claims 1 to 3, wherein the connection portion is curved in a substantially arc shape.   The flange holding mechanism according to any one of claims 1 to 4, wherein the connection portion has one or a plurality of protrusions on a surface facing the piston flange. The pair of claws are formed with tapered surfaces that face each other and narrow toward each other toward the base of the claws,
The flange holding mechanism according to any one of claims 1 to 5, wherein a distance between the narrowest portions of the pair of claws is designed to be smaller than an outer diameter of a piston flange to be held.   The flange holding mechanism according to any one of claims 1 to 6, wherein the pair of claws have a locking surface that is substantially parallel to the upper surface of the piston flange when the claws are closed. .   The flange holding mechanism according to any one of claims 1 to 7, wherein the holder member further includes a fixing member for connection with another member. A syringe holding unit for holding the syringe;
A piston drive mechanism for moving the piston member of the syringe;
A chemical injection device comprising:
A chemical injection device, wherein the piston drive mechanism has the flange holding mechanism according to claim 1. As the piston drive mechanism,
A first piston drive mechanism for holding a piston member of the first syringe;
A second piston drive mechanism for holding the piston member of the second syringe,
The chemical injection device according to claim 9, wherein at least one of the piston drive mechanisms has the flange holding mechanism.   The chemical | medical solution injection device of Claim 9 or 10 with which the load cell is provided in the said piston drive mechanism or the said flange holding mechanism. The chemical injection device according to claim 11, further comprising a control circuit that performs an operation based on a signal from the load cell.   The chemical injection device according to claim 9, comprising a displacement sensor for detecting a distance from the sensor to a connection portion of the flange holding mechanism. The chemical solution injection device according to claim 13, further comprising a control circuit that performs an operation based on a signal from the displacement sensor.   The chemical solution injection device according to claim 9, further comprising a switch that contacts the connection portion of the flange holding mechanism and detects whether or not the connection portion is in a predetermined position. The chemical injection device according to any one of claims 9 to 15 , wherein the syringe filled with a contrast agent is attached. The chemical injection device according to any one of claims 9 to 16 , wherein an IC tag is attached to the syringe.

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