JP2004313748A - Injection supportive instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection supportive instrument which enables the injecting operation with only a finger power without requiring such a control unit as an automatic injector nor a considerable amount of pressure by the palm of a human hand, and also allows a user to feel pressure change, if any, through his fingers which are especially considered to be most sensitive to pressure, that may be caused by its needle piercing through a blood vessel of a patient, by the possible contraction of a blood vessel during the infusion of a contrast agent whereinto, or by its tube being clogged, so as to suspend the injection operation or make it slower. <P>SOLUTION: This injection supportive instrument, which is designed to detachably hold a contrast agent syringe capable of injecting a contrast agent filled in its barrel by the plunger pressing, and to assist the injection operation by the contrast agent syringe held thereby, is provided with a holding means for holding the barrel, a pressing means for pressing the plunger, a control lever which can be operated with fingers, and a power-transmitting means for transmitting the movement of the control lever to the pressing means after slowing down and enhancing the power using the principle of leverage. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an injection aid suitable for injecting a contrast agent.

  2. Description of the Related Art Conventionally, in the medical field, when a contrast agent is injected into a blood vessel or the like, the injection has been performed using a drip, a syringe, or an automatic injection device in which a syringe is set. In this syringe, a contrast medium is injected into a blood vessel by an operation of piercing a blood vessel of a patient with a syringe needle and pushing the hand by hand. In addition, when using an automatic injection device, there is an injection device that uses a mechanical syringe drive mechanism (for example, Japanese Patent Application Laid-Open No. 2001-224885 (corresponding publication: US Patent Publication No. 2001-21823)). In some cases, a contrast medium is sent out at a constant speed by a motor (for example, Japanese Patent Application Laid-Open No. 6-7440 (corresponding publication: US Pat. No. 5,269,762)). In these apparatuses, a syringe is set and connected to the syringe. The contrast agent is injected into the blood vessel by piercing the patient's blood vessel with the injection needle at the distal end of the tube and performing an automatic pressing operation by the device.

  As a manual contrast medium injection aid, there is OZ PalmInjector (registered trademark) of Cardiovascular Arnovations (registered trademark) as shown in FIG. However, this device is a device for injecting the contrast agent filled in the barrel in one operation at a time. It is not possible to operate with the fingers of the hand, but it is necessary to fix the bottom portion to the operating table, and to operate by pressing the operation pedal with a palm with a considerable force.

In addition, a device for manually injecting a fixed amount of subcutaneous injection into a large number of animals, which is not an aid for injecting a contrast agent, is described in, for example, US Pat. No. 3,110,310 and US Pat. No. 3,517,668. . An apparatus for manually implanting a pellet under the skin is described in, for example, U.S. Pat. No. 2,883,984. An apparatus for manually injecting medical pasta is described in, for example, U.S. Pat. No. 4,276,788.
JP 2001-224885 A JP-A-6-7440 U.S. Pat.No. 3,110,310 U.S. Pat. No. 3,517,668 U.S. Patent Publication No. 2883984 U.S. Pat. No. 4,276,788

  As described above, conventionally, when a contrast medium is injected into a blood vessel, the injection is performed using a syringe, a drip, or an automatic injection device. However, when the contrast agent is injected using a drip or an automatic injection device, there are the following problems.

  * 1 Even if a needle is pierced through a patient's blood vessel, the contrast agent continues to be injected, causing tissue damage mainly at the injection site.

  * 2 Even if the patient's blood vessels contract during injection due to the injection of the contrast agent, the contrast agent continues to be injected, causing tissue damage mainly at the injection site.

  * 3 When injecting using an automatic injection device, the injection operation is continued even if the tube is blocked due to the patient gripping the tube between the syringe and the needle or the patient moving and crushing. The problem of bursting the barrel of the syringe.

  In order to avoid such a problem, it is sufficient to inject the contrast medium by manually operating the syringe, but since the contrast medium has a large volume to be injected, unlike a conventional therapeutic drug syringe, the contrast medium has a small cross-sectional area. Large syringes need to be used.

  And, because of the high viscosity, it is necessary to press the syringe with a considerable force instead of the finger to operate the syringe by hand, and to shoot continuously and many times, operate the syringe A bruise can form on the palm of the doctor or technologist. For this reason, when the palm pressure sensation is exhausted, there is a problem that it becomes difficult to perceive the fluctuation in pressure when the patient's blood vessel contracts during injection or when the tube is closed.

  Therefore, the present invention solves the above-mentioned problem, does not require a control device such as an automatic injection device, does not need to press with a palm with a considerable force, can perform an injection operation with the force of a finger, and penetrates a blood vessel of a patient. Even if the patient's blood vessel shrinks during injection or the tube is blocked due to injection of a contrast needle, or if the tube is blocked due to injection of a contrast agent, the pressure fluctuations caused by this can be detected by the finger of the hand with a particularly sharp pressure sensation. It is an object of the present invention to provide a manually operated injection aid which can be felt by the user and can stop or slow down the injection operation.

  In order to solve the above problems and achieve the object, the present invention is configured as follows.

The injection aid of the present invention is an injection aid for detachably holding a contrast agent injector capable of injecting a contrast agent filled in a barrel by pushing a plunger, and assisting an injection operation of the held contrast agent injector. An aid,
Holding means for holding the barrel,
Pushing means for pushing the plunger,
An operation lever operable by a finger of a hand,
And a power transmission means for transmitting the operation of the operation lever to the pushing means by deceleration and increase by the principle of leverage.

  According to this injection aid, the barrel of the contrast agent injector is held by the injection aid, the operation of the operation lever is transmitted to the pushing means by deceleration and increase by the lever principle, and the plunger of the barrel is pushed by the pushing means. By pushing and injecting the contrast agent filled in the barrel, the injection operation can be performed with the force of the finger, and when the injection needle has been pierced through the blood vessel of the patient and the injection of the contrast agent, Even if the patient's blood vessels contract during the injection or the tube is closed, the resulting pressure fluctuation can be sensed with a finger having a particularly sharp pressure, and the injection operation can be stopped or slowed down.

  Further, in the injection aid of the present invention, it is preferable that the initial volume of the contrast agent filled in the barrel is 40 ml or more.

According to this injection aid, since the initial volume of the contrast agent filled in the barrel is 40 ml or more, the stroke range of the plunger is adjusted to an appropriate stroke while injecting the contrast agent required for contrast agent imaging. Even within the range, a control device such as an automatic injection device is not required, there is no need to press with a considerable force with the palm, and the injection operation can be performed with the force of a finger.

  In the injection aid of the present invention, it is preferable that the initial volume of the contrast agent filled in the barrel is 250 ml or less.

  According to this injection assistant, since the initial volume of the contrast agent filled in the barrel is 250 ml or less, the stroke range of the plunger can be adjusted to an appropriate stroke while injecting the contrast agent required for contrast agent imaging. Even within the range, a control device such as an automatic injection device is not required, there is no need to press with a considerable force with the palm, and the injection operation can be performed with the force of a finger.

Further, in the injection aid of the present invention, the barrel preferably has a cross-sectional area of 3 cm ² or more.

  According to this injection aid, even when manually operated, a sufficient injection speed is ensured, and a control device such as an automatic injection device is not required. Can be.

Further, in the injection aid of the present invention, it is preferable that the barrel has a cross-sectional area of 20 cm ² or less.

  According to this injection aid, only the force that can be easily pushed manually is used, a control device such as an automatic injection device is not required, and it is not necessary to press the hand with a considerable force, and the injection operation can be performed with the force of a finger.

  Further, in the injection aid of the present invention, it is preferable that a distance from a tip of the barrel to a fulcrum of a lever of the power transmission means is 40 cm or less.

  According to this injection aid, blurring when the plunger of the barrel is pushed by the pushing means is less likely to occur, and it is easy to take and handle with the hand, and the operation with the hand is easy.

  Further, in the injection assistant of the present invention, it is preferable that a distance from a tip of the barrel to a fulcrum of a lever of the power transmission means is 5 cm or more.

  According to this injection aid, the contrast agent injector can be easily attached and detached even if the initial volume of the contrast agent filled in the barrel is sufficiently large.

Further, in the injection assistant of the present invention, the power transmission means may be:
A rotating member that rotates around a fulcrum of a lever by operation of the operation lever; when the rotating member rotates in a pushing direction, the pushing means advances to the barrel side; Is preferred. The turning member may be the operation lever itself, a member that turns integrally with the operation lever, or a member that turns separately from the operation lever and turns. Is also good.

  In addition, it is preferable that the pushing means advances directly or indirectly to the barrel side by an action from an action point of the rotating member.

  According to this injection aid, it can be pushed with a simple structure.

  Further, in the injection assistant of the present invention, it is preferable that a distance from the fulcrum of the lever to the point of application is 0.5 cm or more.

  According to this injection assistant, a sufficient distance for the pushing means to be pushed by one operation can be sufficiently secured, the operation frequency of the operation lever can be reduced, and the operability is good.

  In the injection aid of the present invention, it is preferable that the distance from the fulcrum of the lever to the point of application is 3 cm or less.

  According to this injection aid, the force required to operate the operation lever can be reduced, and the operation can be performed with the force of a finger. When operated with a finger, the pressure fluctuation at the time of occurrence of an abnormality in the injection of the contrast agent can be sensed with a finger having a particularly sharp pressure interval.

  In addition, in the injection assistant of the present invention, the direction in which the plunger is pushed by the pushing means and the lever of the power transmission means are provided in all operations from the initial position of the operation lever to the maximum operation position. The angle between the fulcrum and the direction connecting the action point is preferably 30 ° or more and 150 ° or less.

  According to this injection assistant, in all operations from the initial position of the operation lever to the maximum operation position, the direction in which the plunger is pushed by the pushing means, the fulcrum of the lever of the power transmission means, and the action point Is preferably 30 ° or more and 150 ° or less, and a predetermined or more of the force transmitted by the power transmitting means is transmitted to the pushing means except for friction and the like, which is preferable.

  In addition, the injection assistant of the present invention transmits the operation of the operation lever to the pressing means by decelerating and increasing the force in all operations from the initial position of the operation lever to the maximum operation position. Is preferred.

  According to this injection aid, in all operations from the initial position of the operation lever to the maximum operation position, the operation of the operation lever is transmitted to the pushing means by deceleration and increase, and the operation of the operation lever is performed. Is required to be smaller than the force transmitted to the pushing means, and the speed at which the operating lever is operated is higher than the speed at which the pushing means moves. Fluctuation is also easy to feel and is preferable.

  Further, the injection assisting tool of the present invention cannot perform all operations from the start of injection of the initial contrast agent filled in the barrel to the end of injection by one operation of the operation lever, and a plurality of operations of the operation lever. It is preferable that all operations from the start of the injection of the contrast agent initially filled in the barrel to the end of the injection can be performed by the above operation.

  According to this injection aid, all operations from the start of injection of the initial contrast agent filled into the barrel to the end of injection can be performed by operating the operation lever a plurality of times, and the operation lever is squeezed with the force of a finger. , Can be injected contrast agent.

  Further, it is preferable that the injection aid of the present invention be capable of visually recognizing the barrel while the barrel is held by the holding means.

  According to this injection aid, the barrel can be visually recognized in a state where the barrel is held by the holding means, and even when the operation lever is being operated, the scale attached to the barrel of the contrast agent injector can be used. And the like, whereby the amount of the contrast agent to be filled can be easily confirmed.

  Further, it is preferable that the injection aid of the present invention is for injecting the contrast agent at an injection speed of 5 ml / sec or less on average.

  According to this injection aid, the contrast medium is injected at an injection speed of 5 ml / sec or less on average, and more appropriate contrast imaging can be performed.

Further, it is preferable that the injection assistant of the present invention is for injecting the contrast agent at an injection pressure of 1 × 10 ⁶ Pa or less.

According to this injection aid, the contrast agent is injected at an injection pressure of 1 × 10 ⁶ Pa or less, and the operation lever can be easily operated with the finger of the hand without the barrel bursting, In addition, the contrast agent can be injected while the pressure fluctuation can be felt more easily with the fingertip. Further, the injection pressure of the contrast agent needs to be equal to or higher than the fluid pressure of the injection destination such as the blood pressure or the pressure in the ureter.

  Further, the injection aid of the present invention is preferably for injecting the contrast agent into the urinary tract or venule.

  This injection aid is suitable for use in injecting a contrast agent into the urinary tract or venules.

  Further, it is preferable that the injection aid of the present invention is provided with a handle at a position where it can be gripped by a human hand together with the operation lever.

  According to this injection assistant, a handle is provided at a position where it can be grasped by a human hand together with the operation lever, and the operation lever can be operated by an operation of grasping a finger.

  Further, it is preferable that the injection assistant of the present invention can be lifted and operated by grasping the operation lever and the handle.

  According to this injection aid, it is possible to lift and operate by grasping the operation lever and the handle, and even if the operator is in any posture, it can be easily operated with the fingers of the hand, and the contrast agent Pressure fluctuation during injection can be easily felt.

  Further, the injection assistant of the present invention is preferably a pistol type in which the handle and the holding means are integrated.

  According to this injection aid, it is a pistol type in which the handle and the holding means are integrated, and can be easily operated.

  Further, the injection assisting tool of the present invention is characterized in that the holding means includes a receiving portion on which the barrel of the contrast agent injector can be mounted, and the barrel mounted on the receiving portion when the barrel is openably and closably closed. It is preferable to have a holding part for holding a part of

  According to this injection aid, the barrel of the contrast agent injector is placed on the receiving part, and a part of the barrel is held by the holding part, so that the attachment and detachment of the contrast agent injector is easy, simple and reliable. Can be held.

  Further, in the injection assistant of the present invention, it is preferable that the holding portion is a transparent body. According to this injection aid, the holding portion is a transparent body, and the amount of the contrast agent to be filled can be easily confirmed by looking at the scale or the like attached to the barrel of the contrast agent injector.

In the injection assistant of the present invention, it is preferable that the holding portion has an elastic body that presses and holds a part of the barrel.

  According to this injection aid, since the holding portion has the elastic body that presses and holds a part of the barrel, the barrel can be reliably pressed and held without damaging the barrel.

  Further, in the injection assistant of the present invention, it is preferable that a barrel of the contrast agent injector has a flange on an opening side of the barrel, and the flange is brought into contact with the holding portion.

  According to this injection aid, the movement of the barrel in the pressing direction can be reliably restricted by bringing the flange of the barrel into contact with the holding portion.

  In the injection assistant of the present invention, the receiving portion may have a protrusion, and the flange may be engaged with the protrusion.

  Further, in the injection auxiliary tool of the present invention, the contrast agent injector is configured such that a piston having a head is engaged with a plunger thereof, and an intermediate portion is provided between a pressing portion of the pressing means and the head of the piston. It is preferable to interpose a plate.

  According to this injection aid, the pressing force from the pushing means is transmitted to the plunger via the intermediate plate and the piston, and even if the pushing means is shifted during operation, the pushing force is transmitted to the plunger via the piston by the intermediate plate. The injection of the contrast medium can be accurately performed by manual operation.

  Further, in the injection assistant of the present invention, the intermediate plate may be engaged with and held by the holding means so as to be movable in the pushing direction and a head of the piston. It is preferable to have a joint holding part.

  According to this injection aid, the intermediate plate is engaged and held on the holding means so as to be movable in the pushing direction, and by engaging and holding the head of the piston engaged with the plunger, the intermediate plate is smoothly pushed in the pushing direction. Can be moved to.

  Further, in the injection assistant of the present invention, it is preferable that the barrel of the contrast medium injector is a transparent body and has a scale indicating the amount of the contrast medium to be filled.

  According to this injection aid, since the barrel of the contrast agent injector is a transparent body and has a scale indicating the amount of the contrast agent to be filled, the amount of the contrast agent can be easily visually checked. it can.

  In the injection aid of the present invention, the contrast agent preferably includes a barium sulfate enema.

  According to this injection aid, the contrast agent also includes a barium sulfate enema and is preferably used in the medical field.

  Hereinafter, an embodiment of the injection assistant of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to this embodiment. Further, the embodiments of the present invention show the most preferable embodiments of the present invention, and the meaning of the terms of the present invention is not limited thereto.

"Embodiment 1"
FIG. 1 is a side view of the injection assistant in the first embodiment, FIG. 2 is a perspective view of the injection assistant, FIG. 3 is a plan view of the injection assistant, FIG. 4 is a schematic configuration diagram of power transmission means, and FIG. FIG. 6 is a perspective view before operation by an operation lever, FIG. 7 is a perspective view at the time of operation by an operation lever, FIG. 8 is a perspective view showing a holding unit, and FIG. 9 is a barrel holding unit. FIG. 10 is a cross-sectional view showing a plunger pushing state, and FIGS. 11A to 11C are side views of a contrast agent injector.

  The injection assistant 1 of this embodiment includes a holding unit 10, a pushing unit 20, an operation lever 30, and a power transmission unit 40, and assists the injection operation of the contrast agent injector 50.

  The contrast agent injector 50 includes a barrel 51 and a plunger 52 as shown in FIGS. The barrel 51 is filled with a predetermined amount of a contrast agent, and the discharge port 51a of the barrel 51 is closed with a cap 51b. The cap 51b is removed and the injection pipe 53 is connected at the time of use. An injection needle (not shown) is connected to the other end of the injection pipe 53.

  The barrel 51 is formed of a transparent body such as a transparent resin or transparent glass, and has a flange 51c on the opening side. A label 55 having a scale 54 indicating the amount of the contrast agent to be filled is adhered to the barrel 51, so that the amount of the contrast agent can be easily checked visually.

  In the plunger 52, a screw hole 52a is formed on the opening side of the barrel 51. As shown in FIGS. 9 and 10, the screw portion 21a1 of the pressing portion 21a provided at the tip of the rod 21 constituting the pressing means 20 is provided. Is detachable. The pressing portion 21a has a pressing flange portion 21a2 formed at the base of the screw portion 21a1. The outer diameter D1 of the pressing flange portion 21a2 is larger than the hole diameter D2 of the screw hole portion 52a and smaller than the inner diameter D3 of the barrel 51. Have been.

  By rotating the rod 21 and screwing the screw portion 21a1 into the screw hole portion 52a, the pressing flange portion 21a2 comes into contact with the pressing surface 52b of the plunger 52, and the plunger 52 can be pressed.

  In this state, the plunger 52 slides in the barrel 51, and the contrast agent in the barrel 51 is injected from the injection pipe 53 connected to the outlet 51 a of the barrel 51.

  In the injection assistant of this embodiment, the contrast agent injector 50 is exchangeably held, so that the work of replacing the contrast agent injector 50 is good.

  The drug injector 50 is shown for 100 ml (FIG. 11 (A)), 80 ml (FIG. 11 (B)) and 50 ml (FIG. 11 (C)). The volume of the contrast agent is preferably 40 ml or more, particularly 70 ml or more, even if the stroke range of the plunger 52 is within an appropriate range while the contrast agent required for the contrast agent imaging can be injected. There is no need to press with a considerable force, the injection operation can be performed with the force of a finger, and the pressure fluctuation at the time of occurrence of an abnormality in the injection of the contrast agent can be felt with a finger having a particularly sharp pressure, which is preferable.

In addition, when the initial volume of the contrast agent filled in the barrel 51 is 250 ml or less, particularly 160 ml or less, the injection operation can be performed by the force of a finger while the stroke range of the plunger 52 is within an appropriate range, which is preferable. In addition, the cross-sectional area of the barrel 51 is 3 cm ² or more, especially 7 cm ² or more. Without the injection aid, it is necessary to push with a considerable force with the palm, but according to the present invention, there is no need for this. While the stroke range of the plunger 52 is within the appropriate stroke range with respect to the volume of the contrast agent required for the contrast agent imaging, the injection operation can be performed with the force of a finger, and the pressure fluctuation at the time of abnormal occurrence during the injection of the contrast agent Is preferable because the pressure sensation can be felt with a finger of a particularly sharp hand. Further, the cross-sectional area of the barrel 51 is preferably not more than 20 cm ² , particularly not more than 15 cm ² , so that the load on the device is small and the injection operation can be performed with the force of a finger. The shift is preferable because the pressure sensation can be felt with a finger having a particularly sharp hand.

The contrast agent filled in the barrel 51 can be used as a contrast agent as shown in Table 1, for example. In particular, it is preferably used as a contrast agent for radiography.

Table 1

  The holding means 10 provided in the injection aid 1 has a receiving portion 11 on which the barrel 51 of the contrast agent injector 50 can be placed, and a holding portion 12 which can be opened and closed with respect to the receiving portion 11. . Then, when the barrel 51 is placed on the receiving portion 11 and the holding portion 12 is closed, the barrel 51 is pressed toward the receiving portion 11. The receiving portion 11 is fixed to the guide body 2, and the guide body 2 is fixed to the handle 3. Thus, the injection aid 1 is a pistol type in which the handle 3 and the holding means 10 are integrated.

  As shown in FIG. 8, the receiving portion 11 and the holding portion 12 are formed in a shape obtained by half-shaving a transparent resin cylinder in the axial direction, and the holding portion 12 is formed shorter than the receiving portion 11. One end of the holding portion 12 can be opened and closed with respect to the receiving portion 11 with the hinge 13 as a fulcrum, and the claw portion 14 at the other end is fixed by engaging with the locking portion 15 of the receiving portion 11.

  The barrel 51 of the contrast agent injector 50 is placed on the receiving portion 11 and a part of the barrel 51 is held by the holding portion 12, so that the attachment and detachment of the contrast agent injector 50 is easy, and the holding is simple and reliable. can do.

  Further, the receiving portion 11 and the holding portion 12 are transparent, and the barrel 51 of the contrast agent injector 50 is visible. The operator can see the scale and the like attached to the barrel 51 of the contrast agent injector 50 even while the operation lever 30 is being operated, thereby easily checking the liquid amount of the contrast agent to be filled. can do.

  In the holding portion 12, an engagement groove 12b is formed on the side of the pressing surface 12a, and an elastic body 16 is embedded and engaged in the engagement groove 12b. By closing and fixing the holding portion 12, the elastic body 16 can press and hold a part of the barrel 51, and can surely press and hold the barrel 51 without damaging the barrel 51. The elastic body 16 uses a flexible resin pipe, but may be made of rubber or the like. In this embodiment, the elastic body 16 is provided at one place, but may be provided at a plurality of places, or may be provided on the entire surface of the pressing surface 12a.

  In addition, the flange portion 51c abuts on the opening side of the barrel 51 with the end portion 11a of the receiving portion 11 and the end portion 12c of the holding portion 12, whereby the movement of the barrel 51 in the pressing direction can be reliably restricted. Further, with the barrel 51 held by the holding portion 12 and the stopper 34 released, the knob 23 of the rod 21 is slightly pulled to pull the plunger 52 and visually observe the blood flowing into the infusion pipe 53. By confirming with, it can be confirmed whether the tip of the injection needle has entered the blood vessel.

  The pushing means 20 provided in the injection aid 1 has a rod 21, a pressing portion 21a provided at the tip of the rod 21, and a knob 23 attached to the head of the rod 21. The body 2 is provided so as to be movable.

The operation lever 30 provided in the injection assisting tool 1 also serves as a rotating member that rotates around the lever fulcrum O1 by operating the operation lever 30. A support shaft 35 fixed to the handle 3 penetrates an operation portion 30b side opposite to the grip portion 30a on the side to be gripped by the finger of the operation lever 30, and is provided rotatably around the support shaft 35. Have been. And grip part 3
By gripping Oa, when the operation lever 30 is operated, it functions as a lever fulcrum O1.

  The handle 3 and the operation lever 30 are both provided at positions where they can be gripped by a human hand. As a result, the handle 3 is grasped with the thumb side of one hand, the operation lever 30 is grasped with the other four finger sides, and the operation lever 30 is operated by manual force by pulling the handle 3 side.

  That is, the operation lever 30 can be operated by the operation of grasping the finger. Further, it is possible to lift and operate by gripping the operation lever 30 and the handle 3. Therefore, regardless of the posture of the operator, the operator can easily operate with his / her finger, and can easily feel the pressure fluctuation at the time of injection of the contrast agent.

  The power transmission means 40 provided in the injection assistant 1 transmits the operation of the operation lever 30 to the pushing means 20 by deceleration and increase by the principle of leverage. As shown in FIGS. 4 and 5, the power transmission means 40 has an operation lever 30 and a chucking plate 32 that is pushed and moved by an operation portion 30 b of the operation lever 30 around a fulcrum O1 of the lever. The chucking plate 32 is slidably in contact with the operation groove 30b1 of the operation section 30b.

  As shown in FIG. 6, the chucking plate 32 has a chucking long hole 32a through which the rod 21 is pushed through by frictionally engaging with the rod 21. As shown in FIG. The chucking plate 21 is tilted, and the chucking slot 32a of the chucking plate 21 frictionally engages with the rod 21 to send the rod 21 forward from the state of FIG. 4 to a state as shown in FIG. Become.

  Further, an elastic member (spring) 33 is disposed between the fixing portion 80 of the guide body 2 and the chucking plate 32 while passing through the rod 21, and the elastic member 33 brings the chucking plate 32 into an initial state. It is urging you to return. Then, when the grip of the operation lever 30 is released, the chucking plate 32 returns to the initial state by the urging force, and the operation lever 30 also moves to return to the initial state.

  A stopper 34 is provided to prevent the rod 21 from moving backward. The stopper 34 is composed of a lever 34a that is cantilevered above the handle 3 and an elastic member (spring) 34c that elastically supports between the lever 34a and the chucking plate 32. The rod 21 passes through the hole 34a1. As soon as the grip of the operation lever 30 is released, the chucking plate 32 becomes perpendicular to the rod 21, slides on the rod 21, and the chucking plate 32 moves the rod 21 backward. There is no.

  The spring force of the elastic member 33 is set to be greater than the spring force of the elastic member 34c. When the contrast agent injector 50 is mounted and the operation lever 30 is pulled as shown in FIG. 4, the operation lever 30 is moved to the lever fulcrum O1. , And pushes the chucking plate 32 slidably in contact with the operation groove 30b1 of the operation section 30b. As a result, the chucking plate 32 moves forward while tilting against the restoring force of the elastic member 33. At this time, the rod 21 is chucked by the chucking long hole 32a of the chucking plate 32, and The plunger 51 of the contrast agent injector 50 is pressed, and the contrast agent is discharged from the outlet 51 a of the barrel 51. When the operating lever 30 is released, the operating lever 30 and the chucking plate 32 return to the initial position by the restoring force of the elastic member 33 without affecting the rod 21 at all.

As described above, the barrel 51 of the contrast agent injector 50 is held by the injection assistant 1, and the operation of the operation lever 30 is transmitted to the pushing means 20 by deceleration and intensification based on the principle of leverage. By pushing the plunger 52 and injecting the contrast agent filled in the barrel 51, the injection operation can be performed by the force of the finger operating the operation lever 30, and the injection needle can be inserted through the patient's blood vessel. If the patient's blood vessels shrink during the injection or the tube is blocked due to the injection of the contrast agent, the pressure fluctuation caused by the injection can be felt with the finger of the hand with a particularly sharp pressure. Operation can be stopped or slowed down.

  Even if the initial volume of the contrast agent filled in the barrel 51 is 40 ml or more, and even 70 ml or more, and the volume is large, there is no need for a control device such as an automatic injection device, and there is no need to press with a considerable force on the palm. Injection can be performed with the power of a finger.

In addition, even when the cross-sectional area of the barrel 51 is 3 cm ² or more, and even 7 cm ² or more, and a large pressing force is required, a control device such as an automatic injection device is unnecessary, and it is necessary to press with a considerable force with a palm. No injection operation can be performed with the power of a finger.

  In this embodiment, as shown in FIG. 1, the distance L1 from the tip of the barrel 51 to the fulcrum O1 of the lever of the power transmission means 20 is preferably 40 cm or less, particularly preferably 25 cm or less. Thus, even if the initial volume of the contrast agent filled in the barrel 51 of the contrast agent injector 50 is large, it is easy to handle and operate the injection aid 1 by hand. The distance L1 is preferably 5 cm or more, particularly preferably 10 cm or more. Accordingly, even if the initial volume of the contrast agent filled in the barrel 51 of the contrast agent injector 50 is large, the attachment / detachment of the contrast agent injector 50 becomes easy.

  Further, in this embodiment, the power transmission means 20 advances the rod 21 toward the barrel side by the chucking plate 32 around the lever fulcrum O1 by the operation portion 30b integrated with the operation lever 30. The operation lever 30 is provided with a member that rotates integrally, such as a separate lever, and when this member rotates, the chucking plate 32 and the rod 21 that constitute the pressing means 20 advance to the barrel side. Is also good.

  As described above, a member that rotates integrally or integrally with the operation lever 30 around the lever fulcrum O1 is provided, and when this member rotates, the pushing means moves forward to the barrel side, so that the operation lever 30 is rotated. The plunger 52 can be pushed by the pushing means 20 with a simple structure based on the principle of leverage.

  As shown in FIGS. 4 and 5, the distance L2 from the fulcrum O1 of the lever to the point of action O2 is preferably 0.5 cm or more, particularly preferably 0.7 cm or more. Thereby, the distance by which the chucking plate 32 is pushed can be secured, the operation frequency of the operation lever 30 can be reduced, and the operability is good.

  Further, the distance L2 from the lever fulcrum O1 to the action point O2 is preferably 3 cm or less, particularly preferably 2 cm or less. Accordingly, the force required for operating the operation lever 30 based on the principle of leverage is weakened, the injection operation can be performed with the force of the finger, and the pressure fluctuation at the time of occurrence of an abnormality in the injection of the contrast medium can be reduced by the finger of the hand whose pressure sense is particularly sharp. You can feel it.

  In all operations from the initial position of the operation lever 30 to the maximum operation position, the direction DP in which the plunger 52 is pushed by the pushing means 20 and the fulcrum of the lever of the operation lever 30 as the power transmission means 40. The angle θ between the support shaft 35, which is O1, and the direction DL connecting the tip O2 of the operation portion 30b of the operation lever 30, which is the point of action, is preferably 30 ° or more and 150 ° or less, particularly 45 °. It is preferable that the angle is not less than 135 ° because not less than 50% of the force transmitted by the power transmission means 40 is transmitted to the pushing means 20 except for friction and the like. In the embodiment shown in the drawing, the angle θ is not less than 80 ° and not more than 135 °. In this manner, in all operations from the initial position of the operation lever 30 to the maximum operation position, the operation of the operation lever 30 is transmitted to the pushing means 20 by deceleration and increase, that is, In all operations from the initial position of the operation lever 30 to the maximum operation position, the force required for operating the operation lever 30 is smaller than the force transmitted to the pushing means 20 and the speed at which the operation lever 30 is operated. However, it is preferable that the moving speed of the pressing means 20 be higher than that of the pressing means 20 because it can be easily operated with the force of a finger consistently and the pressure fluctuation is easily felt.

  It is preferable that the rod 21, the chucking plate 32, and the elastic member 33 are made of metal and the other members are made of structural plastic from the viewpoint of balance between weight and durability. When used for real-time imaging of a tomographic tomographic image of a subject by using a magnetic resonance effect in an MRI apparatus, that is, an MRI apparatus, a metal member of an injection assisting tool, particularly a rod having a large volume, is not used. A non-magnetic metal such as magnetic stainless steel is preferable because the possibility of disturbing the magnetic field is reduced.

"Modified example"
FIG. 12 is a side view showing a modification of the injection assistant according to the first embodiment. The injection assisting tool 1a of this modified example has a projection 71 on the receiving portion 70 of the holding means 10a. When the contrast agent injector 50 is mounted on the holding means 10a, the projection 71 Engage with the part 51c. Thereby, after the operation lever 30 is returned to the initial state, the knob portion 23 is pulled backward in the state opposite to the pushing direction with the stopper 34 released, whereby the plunger 52 is returned in the direction opposite to the pushing direction. At this time, it is possible to restrict the barrel 51 from being pulled back to the side opposite to the pressing direction.

"Embodiment 2"
Next, FIG. 13 shows the vicinity of the power transmission means 40a of the injection aid 1b of the second embodiment, which is an example in which the power transmission means 40 provided in the injection aid 1 of the first embodiment is modified. In this embodiment, a guide member 90 is provided on the operation lever 30 in parallel with the rod 21, and the guide member 90 is supported by two pairs of support rollers 91 disposed at two front and rear positions so as to be movable in the front and rear direction. . The guide member 90 is formed with rack teeth 90a, and the rack teeth 90a are engaged with the pinion teeth 92a of the rotating body 92 provided in the injection assistant 1b. The rotating body 92 has a built-in one-way clutch 93 that allows rotation only in the forward direction. The rotating body 92 and the drive shaft 94 rotate integrally, and the pinion teeth 94a of the drive shaft 94 are connected to the rack teeth 21d of the rod 21. Are engaged.

  When the operating lever 30 is pulled, the guide member 90 rotates the rotating body 92 in the forward direction, whereby the rotating body 92 and the drive shaft 94 rotate integrally in the pushing direction, and the rod 21 advances. That is, the pushing means 20 advances to the barrel 51 side. At this time, the operation of the operation lever 30 is transmitted to the drive means 20 by deceleration and increase in power according to the principle of leverage according to the reduction ratio between the pinion teeth 92a and the pinion teeth 94a of the rotating body 92. Thereby, the plunger 52 is pushed and the contrast agent filled in the barrel 51 is injected. When the hand for operating the operation lever 30 is released, the operation lever 30 returns to the original position by the elastic member 95.

  Also, in all operations from the initial position of the operation lever 30 to the maximum operation position, the direction DP in which the plunger 52 is pushed by the pushing means 20 and the fulcrum of the lever of the rotating body 94 which is the power transmission means 20. The angle θ between the central axis O1 and the direction DL connecting the pinion tooth 94a of the rotating body 94 and the rack tooth 21d provided on the rod 21 as the point of action is 30 ° or more and 150 ° or more. When the angle is 45 ° or more and 135 ° or less, 50% or more of the force transmitted by the power transmitting means 40a is transmitted to the pushing means 20 except for friction and the like. preferable.

  In the embodiment shown in FIG. 13, the angle θ is 90 °. In this manner, in all operations from the initial position of the operation lever 30 to the maximum operation position, the operation of the operation lever 30 is transmitted to the pushing means 20 by deceleration and increase, that is, In all operations from the initial position of the operation lever 30 to the maximum operation position, the force required for operating the operation lever 30 is smaller than the force transmitted to the pushing means 20 and the speed at which the operation lever 30 is operated. However, it is preferable that the moving speed of the pressing means 20 be higher than that of the pressing means 20 because it can be easily operated with the force of a finger consistently and the pressure fluctuation is easily felt.

  As described above, in the first and second embodiments described above, it is not possible to perform all operations from the start to the end of the injection of the initial contrast agent filled in the barrel 51 by one operation of the operation lever 30, but a plurality of operations. By operating the lever 30, everything from the start of the injection of the contrast agent initially filled in the barrel 51 to the end of the injection can be performed. Thus, the contrast agent can be injected by the operation of grasping the operation lever 30 with the force of a finger. The start of the injection means the timing at which the initial contrast agent filled in the barrel 51 is first sent out from the inside of the barrel 51, and the end of the injection is a pushing means for pushing the plunger 52 in the barrel 51. This is the timing when the motor 20 cannot move forward any more.

In the first and second embodiments, the injection rate of the contrast agent is preferably 5 ml / sec or less on average. Thus, the operation lever 30 can be easily operated with the finger of the hand, and the contrast agent can be injected while the pressure fluctuation can be felt more easily with the fingertip. Further, the injection speed of the contrast agent is preferably 0.1 ml / sec or more on average. Thereby, more appropriate contrast imaging can be performed. Further, the injection pressure of the contrast agent is preferably 1 × 10 ⁶ Pa or less. Thereby, the operation lever 30 can be easily operated with the finger of the hand without the barrel 51 bursting, and the contrast agent can be injected while the pressure fluctuation can be felt more easily with the fingertip. Further, the injection pressure of the contrast agent needs to be equal to or higher than the fluid pressure of the injection destination such as the blood pressure or the pressure in the ureter. Further, the contrast medium injection device is suitable for being used to inject a contrast medium into the urinary tract or venules.

"Embodiment 3"
The third embodiment is a modification of the holding means 10 and the pushing means 20 of the contrast agent injector of the first or second embodiment.

  14 is a side view of the injection assistant in the third embodiment, FIG. 15 is a perspective view of the injection assistant, FIG. 16 is a plan view of the injection assistant, FIG. 17 is a perspective view showing holding means, and FIG. FIG. 19 is a front view, FIG. 19 is a perspective view of an intermediate plate, and FIGS. 20 (A) to 20 (C) are perspective views of a contrast agent injector.

  The injection assistant 101 of this embodiment includes a holding unit 110, a pushing unit 120, an operation lever 130, and a power transmission unit 140, and assists the injection operation of the contrast agent injector 150.

  The contrast agent injector 150 includes a barrel 151 and a plunger 152, as shown in FIGS. The barrel 151 is filled with a predetermined amount of a contrast agent, and the discharge port 151a of the barrel 151 is closed with a cap 151b. The cap 151b is removed and the injection pipe 153 is connected during use.

  The barrel 151 is formed of a transparent body such as a transparent resin or transparent glass, and has a flange 151c on the opening side. A label 155 having a scale 154 indicating the amount of the contrast agent to be filled is adhered to the barrel 151, so that the amount of the contrast agent can be easily checked visually.

  The plunger 152 is detachably engaged with a piston 156 having a head 156a. The head 156a is pushed by the pushing means 120, and by this pushing, the piston 156 and the plunger 152 slide in the barrel 151, and can be injected from the injection pipe 153 connected to the discharge port 151a of the barrel 151.

  In the injection assistant of the present embodiment, the contrast agent injector in a state in which the piston 156 is engaged is exchangeably held, so that the workability of replacing the contrast agent injector is good.

  This contrast agent injector 150 is for 100 ml (FIG. 20 (A)), 80 ml (FIG. 20 (B)), and 50 ml (FIG. 20 (C)). Although it can be used as a contrast agent, it is particularly preferable to use it as a contrast agent for radiography.

Table 2

  The present invention is not limited to this, and may be used for injection of a large volume of a contrast agent.

  Further, in this embodiment, a drug solution of a contrast agent is shown as a drug, but it can be used for a large-capacity barium sulfate enema and the like in addition to the above-mentioned contrast agent.

Barium sulfate enema is to be injected into the large intestine from the anus for imaging.
Brand name Manufacturer Varienema Ota Pharmaceutical Barospars Enima Set (Horii) Horii Pharmaceutical Co., Ltd. and the like are preferred, and are preferably used in the medical field.

  The holding means 110 provided in the injection assistant 101 has a receiving portion 111 on which the barrel 151 of the contrast agent injector 150 can be mounted, and a holding portion for holding a part of the barrel 151 mounted on the receiving portion 111. And a portion 112. The receiving portion 111 is fixed to the guide body 102, and the guide body 102 is fixed to the handle 103.

  As shown in FIG. 17, the receiving portion 111 and the holding portion 112 are formed in a shape obtained by halving a transparent resin cylinder in the axial direction, and the holding portion 112 is formed shorter than the receiving portion 111. One end of the holding portion 112 can be opened and closed with respect to the receiving portion 111 with the hinge 113 as a fulcrum, and the claw portion 114 at the other end is fixed by engaging with the locking portion 115 of the receiving portion 111.

  The barrel 151 of the contrast agent injector 150 is placed on the receiving portion 111, and a part of the barrel 151 is held by the holding portion 112, so that the contrast agent injector 150 can be easily attached and detached, and is easily and securely held. can do.

  Further, the receiving portion 111 and the holding portion 112 are transparent bodies, and the amount of the contrast agent to be filled can be easily confirmed by looking at a scale or the like provided on the barrel 151 of the contrast agent injector 150.

  The holding portion 112 has an engaging groove 112b formed on the pressing surface 112a side, and the elastic body 116 is engaged with the engaging groove 112b. By closing and fixing the holding portion 112, the elastic body 116 can press and hold a part of the barrel 151, and can surely press and hold the barrel 151 without damaging the barrel 151. The elastic body 116 uses a flexible resin pipe, but may be made of rubber or the like. Further, the elastic body 116 is provided at one place in this embodiment, but may be provided at a plurality of places, or may be provided on the entire surface of the pressing surface 112a.

  Further, the flange portion 151c provided on the opening side of the barrel 151 abuts on the end portion 111a of the receiving portion 111 and the end portion 112c of the holding portion 112, so that the movement of the barrel 151 in the pressing direction is reliably restricted. Can be.

  The pushing means 120 provided in the injection assistant 101 has a rod 121, a pressing part 122 attached to the tip 121 a of the rod 121, and a knob 123 attached to the head 121 b of the rod 121. The rod 121 is movably provided on the guide body 102, and an intermediate plate 124 is interposed between the pressing portion 122 and the head 156 a of the piston 156.

  As shown in FIGS. 18 and 19, the intermediate plate 124 has an engagement sliding portion 124a, an engagement holding portion 124b, and a pressing portion 124c, and is integrally formed of resin, but is not limited thereto. . The engagement sliding portions 124a are formed on both sides of the pressing portion 124c, and the notch portions 124a1 are slidably engaged with the rail portions 102a formed on the left and right sides of the guide body 102, respectively, and are pushed in the pushing direction toward the holding means. Is movably engaged and held. Further, the engagement holding portion 124b is formed below the pressing portion 124c, the outer surface 124b1 is formed to be slidable on the guide surface 102b of the guide body 102, and the head 156a of the piston 156 is formed in the concave groove 124b2. The engagement is maintained. Thus, by pulling the knob 123 of the rod 121, the plunger 152 can be pulled via the piston 156 to check whether the tip of the injection needle has entered the blood vessel.

  An opening 102 c is formed in the guide body 102, and the pressing portion 122 of the rod 121, the intermediate plate 124, and the head 156 a of the piston 156 engaged and held by the engagement holding portion 124 b of the intermediate plate 124 serve as a guide. It does not interfere with the body 102.

  The pressing force from the pressing means 120 is transmitted to the plunger 152 via the intermediate plate 124 and the piston 156. Even if the pressing means side shifts during operation, the pressing force is transmitted to the plunger 152 via the piston 156 by the intermediate plate 124. Is controlled, and the contrast agent can be injected accurately by manual operation.

  The intermediate plate 124 is engaged and held movably in the pushing direction on the holding unit 110 side, that is, the guide body 102 to which the holding unit 110 is fixed, and is engaged and held on the head 156a of the piston 156, It can move smoothly in the pushing direction.

  The operation lever 130 provided in the injection assisting tool 101 has a grip portion 130a and an operation portion 130b, and the operation portion 130b side is provided on the handle 103 so that the support shaft 135 can pivot about a support shaft 135. The handle 103 is gripped by the thumb side of one hand, the operation lever 130 is gripped by the other four fingers, and the operation is performed by a manual force pulled toward the handle 103 side.

"Modified example"
FIG. 21 is a side view showing a modification of the injection assistant according to the third embodiment. The injection assisting tool 101a of this modification is provided with a projection 171 on the receiving portion 170 of the holding means 110a. When the contrast agent injector 150 is mounted on the holding means 110a, the projection 171 is fitted to the flange of the barrel 151. Engage with the part 151c. Thus, after the operation lever 130 is returned to the initial state, the knob 123 is pulled rearward in the direction opposite to the pushing direction with the stopper 134 released, whereby the plunger 152 is returned in the direction opposite to the pushing direction. At this time, it is possible to restrict the barrel 151 from being pulled back to the side opposite to the pressing direction.

"Embodiment 4"
This embodiment is a modification of the power transmission means of the first to third embodiments. FIG. 22 is a schematic configuration diagram of the power transmission means 140a of the fourth embodiment, and FIG.
FIG. 3 is a schematic configuration diagram showing an operating state of the device.

  The power transmission means 140a provided in the injection assistant 101 transmits the manual force to the operation lever 130 to the pushing means 120 by increasing the force by the principle of leverage. By the leverage principle, the chucking plate 132 is fixed to the operation part 130b of the operation lever 130 as shown in FIGS. The chucking plate 132 has a through hole 132a through which the rod 121 passes. The rod 121 is sent forward from the state shown in FIG. 22 to the state shown in FIG.

  Further, an elastic member (spring) 133 is disposed between the fixing portion 180 of the guide body 102 and the chucking plate 132 while passing through the rod 121, and the elastic member 133 brings the chucking plate 132 to an initial state. Has a restoring force to return.

  Further, a stopper 134 for preventing the rod 121 from moving backward is provided. The stopper 134 includes a lever 134a that is cantilevered above the handle 103, and an elastic member 134c that elastically supports the lever 134a between the fixed portion 134b of the guide body 102. The rod 121 passes through the hole 134a1.

  The stopper 134 has no effect when the rod 121 is moved forward by the operation of pulling the operation lever 130 toward the handle 103, but when a force is applied to push the rod 121 backward, the through hole is formed. The frictional resistance is increased at the edge of 134a1 to prevent the rod 121 from sliding backward.

  When the contrast agent injector 150 is mounted and the operation lever 130 is pulled as shown in FIG. 22, the chucking plate 132 moves forward while tilting against the restoring force of the elastic member 133. The rod 121 is chucked by the chucking plate 132 and moves forward, and as a result of the plunger 151 of the contrast agent injector 150 being pressed through the intermediate plate 124, the liquid medicine is discharged from the outlet 151a of the barrel 151. Is discharged.

  When the operating lever 130 is released, the operating lever 130 and the chucking plate 132 return to the initial positions by the restoring force of the elastic member 133 without affecting the rod 121 at all.

  As described above, in the injection assisting tool 101 of this embodiment, when the barrel 151 of the contrast agent injector 150 is mounted and held on the holding means 110 and the operation lever 130 is operated by a manual force, the manual force transmits the power. By being transmitted to the pushing means 120 by the means 140 and the pushing means 120 pushing the plunger 152 of the contrast medium injector 150 via the intermediate plate 124 and the piston 156, the chemical solution of the contrast medium injector 150 can be injected. Even when a high-viscosity contrast medium is injected at a high pressure, it can be injected quickly and easily by manual operation.For example, whether or not an injection needle is correctly inserted into a blood vessel of a patient, an injection speed, and the like can be manually adjusted. You can know it with your fingers.

  By increasing the manual force on the operation lever 130 by leverage and transmitting it to the pushing means 120, the injection can be performed more quickly and easily by manual operation.

As described above, in the injection aid of the present invention, the barrel of the contrast agent injector is held by the injection aid, and the operation of the operation lever is transmitted to the pushing means by deceleration and increase by the principle of leverage, and the pushing means By pushing the plunger of the barrel and injecting the contrast agent filled in the barrel, the injection operation can be performed with the force of a finger, and when the injection needle pierces the blood vessel of the patient and the injection needle is Even if the patient's blood vessel contracts during the injection or the tube is blocked by the injection of the agent, the resulting pressure fluctuation can be sensed with a finger with a particularly sharp hand, and the injection operation is stopped or slowed down. be able to. Therefore, it is suitable for injecting a contrast agent.

FIG. 3 is a side view of the injection assistant according to the first embodiment. It is a perspective view of an injection assistant. It is a top view of an injection assistant. It is a schematic block diagram of a power transmission means. FIG. 4 is a schematic configuration diagram illustrating an operation state of a power transmission unit. It is a perspective view before operation by an operation lever. It is a perspective view at the time of operation with an operation lever. It is a perspective view which shows a holding means. It is a top view of a barrel holding part. It is sectional drawing which shows a plunger pushing state. It is a side view of a contrast agent injector. It is a side view showing a modification of the injection assistant in Embodiment 1. FIG. 10 is a view showing a power transmission unit of the injection assistant according to the second embodiment. FIG. 13 is a side view of an injection assistant according to a third embodiment. It is a perspective view of an injection assistant in Embodiment 3. It is a top view of an injection assistant in Embodiment 3. FIG. 13 is a perspective view illustrating a holding unit according to a third embodiment. It is a front view of an intermediate plate in Embodiment 3. FIG. 13 is a perspective view of an intermediate plate according to a third embodiment. It is a perspective view of a contrast agent injector in Embodiment 3. It is a side view showing a modification of an injection assistant in Embodiment 3. FIG. 14 is a schematic configuration diagram of a power transmission unit according to a fourth embodiment. FIG. 14 is a schematic configuration diagram illustrating an operation state of a power transmission unit according to a fourth embodiment. It is a figure which shows the conventional manual injection | pouring auxiliary tool of a contrast medium.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Injection auxiliary tool 10 Holding means 20 Pushing means 30 Operation lever 40 Power transmission means 50 Contrast agent injector 51 Barrel 52 Plunger

Claims (30)

An injection auxiliary tool for detachably holding a contrast agent injector capable of injecting a contrast agent filled in a barrel by pushing a plunger, and assisting an injection operation of the held contrast agent injector,
Holding means for holding the barrel,
Pushing means for pushing the plunger,
An operation lever operable by a finger of a hand,
And a power transmission means for transmitting the operation of the operation lever to the pushing means by deceleration and increase according to the principle of leverage. The injection aid according to claim 1, wherein the volume of the contrast agent initially charged in the barrel is 40 ml or more. 3. The injection aid according to claim 1, wherein an initial volume of the contrast agent filled in the barrel is 250 ml or less. The injection aid according to any one of claims 1 to 3, wherein a cross-sectional area of the barrel is 3 cm ² or more. The injection assistant according to any one of claims 1 to 4, wherein a cross-sectional area of the barrel is 20 cm ² or less. The injection assistant according to any one of claims 1 to 5, wherein a distance from a tip of the barrel to a fulcrum of a lever of the power transmission means is 40 cm or less. The injection aid according to any one of claims 1 to 6, wherein a distance from a tip of the barrel to a fulcrum of a lever of the power transmission means is 5 cm or more. The power transmission means,
A rotating member that rotates around a fulcrum of a lever by operation of the operation lever; when the rotating member rotates in a pushing direction, the pushing means advances to the barrel side; The injection aid according to any one of claims 1 to 7, wherein: 9. The injection assistant according to claim 8, wherein the pushing means advances directly or indirectly to the barrel side by an action from an action point of the rotating member. The injection aid according to claim 9, wherein a distance from the fulcrum of the lever to the action point is 0.5 cm or more. The injection aid according to claim 9 or 10, wherein a distance from a fulcrum of the lever to the action point is 3 cm or less. In all operations from the initial position of the operation lever to the maximum operation position, the direction in which the plunger is pushed by the pushing means, and the direction connecting the fulcrum of the lever of the power transmission means and the action point. The injection aid according to any one of claims 9 to 11, wherein the angle between the injection aid and the base is 30 ° or more and 150 ° or less. The method according to claim 1, wherein the operation of the operation lever is transmitted to the pressing means by deceleration and boosting in all operations from the initial position of the operation lever to the maximum operation position. Item 13. The injection aid according to any one of Items 12. It is not possible to perform all operations from the start of the injection of the contrast agent filled in the barrel to the end of the injection by the operation of the operation lever once, and the operation of operating the operation lever a plurality of times to initially fill the barrel. 14. The injection assistant according to any one of claims 1 to 13, wherein the injection assistant can perform everything from the start to the end of injection of the contrast agent. The injection aid according to any one of claims 1 to 14, wherein the barrel is visible while the barrel is held by the holding means. The injection aid according to any one of claims 1 to 15, wherein the injection aid is for injecting the contrast agent at an injection speed of 5 ml / sec or less on average. The injection assistant according to any one of claims 1 to 16, wherein the injection is for injecting the contrast agent at an injection pressure of 1 × 10 ⁶ Pa or less. 18. The injection aid according to any one of claims 1 to 17, wherein the injection aid is for injecting the contrast agent into a urinary tract or a small vein. 19. The injection aid according to any one of claims 1 to 18, wherein a handle is provided at a position where the handle can be grasped by a human hand together with the operation lever. 20. The injection assistant according to claim 19, wherein the auxiliary device can be lifted and operated by grasping the operation lever and the handle. The injection assistant according to claim 19 or 20, wherein the handle and the holding means are of a pistol type integrated with each other. The holding means includes a receiving portion on which the barrel of the contrast agent injector can be placed, and a holding portion for holding a part of the barrel placed on the receiving portion when the barrel is openably and closably closed. The injection aid according to claim 1, further comprising: The said auxiliary | assistant part is a transparent body, The injection assistance tool of Claim 22 characterized by the above-mentioned. 24. The injection assistant according to claim 22, wherein the holding portion has an elastic body that presses and holds a part of the barrel. 25. The barrel according to claim 22, wherein the barrel of the contrast agent injector has a flange on the opening side of the barrel, and the flange is brought into contact with the holding portion. The injection aid as described. The injection aid according to any one of claims 22 to 25, wherein the receiving portion has a projection, and the flange is engaged with the projection. The contrast agent injector is characterized in that a piston having a head is engaged with the plunger, and an intermediate plate is interposed between a pressing portion of the pressing means and the head of the piston. The injection aid according to any one of claims 22 to 24. The intermediate plate includes an engagement sliding portion that is engaged and held movably in the pushing direction on the holding unit side, and an engagement holding portion that engages and holds a head of the piston. 28. The injection aid of claim 27. The injection aid according to any one of claims 1 to 28, wherein a barrel of the contrast agent injector is a transparent body and has a scale indicating a liquid amount of the contrast agent to be filled. . The injection aid according to any one of claims 1 to 29, wherein the contrast agent includes a barium sulfate enema.

Images