JP4600280B2 - Chemical solution supply control device and chemical solution administration set using the device - Google Patents

Description

The present invention relates to a chemical solution administration set using chemical liquid supply control device and the device.

  Methods for administering a drug solution to a patient using a syringe include a method of connecting a syringe to an injection needle that can be connected to the tip of a syringe, an indwelling needle already placed in a blood vessel, or a so-called injection line extending from a catheter. At this time, there is no problem if a blood vessel is secured in advance, that is, if the tip of the injection needle connected to the injection line is securely placed in the blood vessel.

  However, if this is not the case, it is necessary to confirm the flow path to the blood vessel and the position of the tip of the connected injection needle. In general, first, so-called “priming” is performed to remove air in the injection line up to the patient with a drug solution or physiological saline, and then the injection needle of the injection line is punctured into the blood vessel of the patient. Thereafter, the plunger of the syringe is pulled and the so-called “flashback” in which blood flows back to the injection line is visually observed to confirm that the injection needle is securely placed in the blood vessel.

  When a drug solution is administered to a patient inside an apparatus such as a CT scanner or an MRI scanner (magnetic resonance diagnostic apparatus), an automatic injector is used manually or as an injection means for the elbow vein or the like because of the necessity. Are often administered at high infusion rates. When administering a liquid medicine to a patient as described above, for example, even when a blood vessel is secured in advance, the tip of the injection needle may come off the patient's blood vessel due to movement of the patient in the apparatus. . Therefore, it is necessary to perform flashback before administration of the drug solution to check whether or not blood vessels are secured.

Usually, in medical institutions, in order to prevent the drug solution to be injected into the blood vessel from leaking out of the blood vessel, immediately before administering the drug solution, the plunger of the syringe is pulled again to check the backflow of blood to the injection line. ing. However, there has been a problem that the tip position of the placed injection needle may not be properly placed in the blood vessel due to movement of the position of the tip of the injection needle at a high injection speed or body movement of the patient.
At the same time, when the patient is inside a CT scanner, MRI scanner or the like, there is also a problem that it is difficult to confirm the backflow of blood.

  At this time, if the blood vessel is not properly secured, the patient feels a great deal of pain by forcibly injecting the drug solution outside the blood vessel, that is, outside the blood vessel. As a result, the forcibly injected medicine is wasted, and it is necessary not only to perform the originally scheduled examination again, but also the patient should be treated at the site where the medicine is forcibly injected. I must. These things can cause unnecessary medical practices and cost burdens.

  Furthermore, when the syringe that administers the medicinal solution is a prefilled medicinal solution prefilled syringe (prefilled syringe), the gasket is located near the open end of the syringe barrel, or the gasket is removed during high-pressure steam sterilization. A stopper may be inserted from the open end for the purpose of prevention, but in these cases, the plunger cannot be pulled due to the structure. Therefore, in the above, it is impossible to confirm the securing of the blood vessel. Therefore, in reality, there is a possibility that the above problem due to the lack of the blood vessel may inevitably occur.

  In addition, even when a chemical solution is administered through a catheter, depending on the insertion site of the catheter, in other words, when the catheter is inserted deep in the patient's body, the same problem as described above has occurred. It was.

  Furthermore, depending on the type of medicinal solution, the maximum infusion rate may be determined, but conventionally, when the medicinal solution infusion rate is higher than the normal infusion rate, this is notified to the practitioner. Or, in many cases, it is impossible to stop the injection of the chemical solution. For this reason, in the above case, the patient is burdened.

  In addition, when administering radiopharmaceuticals, the syringe and injection line may be covered with a protective wall to prevent the operator from being exposed to radiation. Cannot be confirmed. Therefore, in the above case, it is impossible to confirm whether or not the blood vessel is secured. Therefore, the above-described problem due to the fact that the blood vessel is not secured may inevitably occur.

  Problems to be solved include "when the patient who administers the drug solution is inside a CT scanner or MRI scanner", "when the syringe which administers the drug solution is a prefilled syringe", or " `` When administering a drug solution through a catheter inserted deep in the area of '' or `` Syringe or injection line should be covered with a protective wall to prevent exposure to the operator when administering radiopharmaceuticals. '' In the case of “disconnected”, it is a point that a blood vessel is secured or not, and whether or not it can be easily detected.

The present invention aims to provide a chemical solution administration set using resolved chemical liquid supply control device and a device of the above problems, it is an aspect of chemical liquid supply control device of the present invention, (a ) A housing interposed between the medicinal solution supply means and the injection line, and (b) slidably provided in the axial direction inside the housing, and the medicinal solution supply means and the injection line can be intermittently moved by sliding in the axial direction. In the chemical liquid supply control apparatus having a spool connected to the housing, the housing is opposed to (a) a spool hole and (b) one end face in the axial direction of the spool, and the gap between this end face is an inflow portion for operation. And (c) an outflow port through which the chemical liquid in the spool hole flows out to the injection line is formed, and an inflow port through which the chemical liquid from the chemical liquid supply means flows into the spool hole is formed in the housing or the spool. A spool for slidably connecting the inflow port and the outflow port is provided slidably in the axial direction, and when the pressure of the chemical solution rises when the inflow port and the outflow port are connected, The chemical solution from the injection line is supplied to the inflow section for operation, the spool is slid by the pressure of this chemical solution, the connection between the inflow port and the outflow port is cut off, and the chemical solution is supplied from the chemical solution supply means to the injection line. The chemical solution supply stopping means for stopping is provided .
An inflow port may be formed in the housing.
Further, the spool has a pair of lands separated in the axial direction, and a groove connecting the inflow port and the outflow port is formed between both lands, and a chemical solution supply stop means is formed in the spool to operate with the groove. It may be used as a flow path for communicating the inflow portion for use.
Further, the chemical liquid supply stop means may be formed in the housing and may be an inlet side operation port that communicates the chemical liquid supply means with the operation inflow portion.
Furthermore, the inflow port may be used also as the inlet side operation port.
In addition, the chemical solution supply stop means may be formed in the housing, and may be an outlet side operation port that communicates the injection line with the operation inflow portion.
Further, the outflow port may be used also as the outlet side operation port.
In addition, at least a part of the facing portion may be an auxiliary portion made of an elastic material.
Further, there may be provided a setting means that allows the spool to slide only when the pressure of the liquid medicine becomes equal to or higher than the set pressure, and disconnects the connection between the liquid medicine supply means and the injection line.
In addition, the set pressure of the setting means may be adjustable.
Further, the housing is formed with (a) an inflow port and (b) an operation port for allowing the liquid medicine in the injection line to flow into the inflow portion for operation, and has a spool operation means. Engagement means for releasing the above engagement when the operating force of the operating means becomes equal to or greater than the set operating force when the spool is operated so as to be freely disengaged and the spool is operated away from the facing portion.
May be provided .
The spool has a pair of lands that are spaced apart in the axial direction and are slidable in the axial direction in the spool hole, and the gap between the lands is a groove that connects the inflow port and the outflow port. Sometimes.
The spool further comprises: (a) a pair of small-diameter lands that are spaced apart in the axial direction and are slidable in the axial direction in the spool hole; and (b) both the small-diameter lands and the axial direction of the spool. A large-diameter land that is disposed between the end faces and has a larger diameter than the small-diameter land and is slidable in the axial direction in the spool hole may be provided.
In addition, both the small-diameter land and the large-diameter land may be separated.
Furthermore, the spool may be provided with a notifying unit that protrudes to the outside of the housing when the connection between the drug solution supply means and the injection line is shut off, and notifies the shut-off.
The operating means includes (a) a lever pivotally supported by the housing, and (b) a return spring for returning the rocked lever to its original position, and the engaging means includes (i) There may be provided a circumferential groove formed on the spool and (ii) an engagement portion formed on the insulator and detachably engaged with the circumferential groove through elastic deformation.
Further, the insulator may be used as a notification unit that notifies the interruption when the connection between the inflow port and the outflow port is interrupted.
The housing may be provided with a cylindrical injection line mounting part surrounding the outflow port, and the injection line mounting part may be provided with a luer lock adapter connected to the injection line.
Further, an outflow port is formed on the side portion of the housing, and the spool is formed on (a) a communication path that is connected to the chemical solution supply means and communicates with the inflow portion for operation, and (b) is formed on the side portion of the spool. There may be an inflow port communicating with the communication passage and the spool hole .
The housing is (a) a first member having a substantially cylindrical shape, the inside being a spool hole, the tip portion being an opposing portion, and an inflow port being formed in the side wall portion in the radial direction; b) It is made into the substantially cylindrical shape opened to both axial directions, has a 2nd member which has the connection part by the side of a base, and the injection line mounting part by the side of the front-end | tip part connected with an injection line, and a connection part is 1st. The inflow port is internally attached to the member from the distal end side, and the inflow port is included in the connection portion, and the inflow port may communicate with the injection line mounting portion through the gap between the first and second members.
Furthermore, a luer lock adapter connected to the injection line may be provided in the injection line mounting part.
The housing may have a lid that is provided at the base end of the first member and restricts the sliding of the spool toward the rear side in the axial direction.
Furthermore, the first to third lands are arranged in the axial direction from the front end to the base end on the outer periphery of the spool, and the connection between the inflow port and the outflow port is between the first and second lands. It is a blocking groove that communicates with the outflow port when shutting off, and the second and third lands are always in communication with the inflow port, and for connection with the outflow port when the inflow port and the outflow port are connected. Sometimes a groove.
In addition, a fourth land is provided on the base side of the outer periphery of the spool with respect to the third land, and the distance between the third and fourth lands is made larger than the distance between the connecting position and the blocking position of the spool. Sometimes.
Further, a through hole is formed in the spool in the axial direction, the base of the spool is a tip mounting portion on which the tip of the syringe is separably mounted, and the tip of the through hole is a communication path There is also.
Also, setting means for setting the value of the external force required for sliding the spool may be provided.
Further, the setting value of the setting means may be adjustable.
Further, the spool may be provided with a notifying part that protrudes rearward in the axial direction of the housing when the connection between the inflow port and the outflow port is disconnected, and notifies the above-described disconnection.
Furthermore, a three-way stopcock function may be provided between the chemical solution supply means and the inflow port.
It is a feature of the drug solution administration set of the present invention is that having the chemical supply control device and the chemical supply unit.
The chemical solution supply means may be an injection syringe.
Moreover, the syringe for injection may be a syringe filled with a chemical solution.
Further, the chemical solution supply means may be an infusion bag.
In addition, the infusion bag may be a solution-filled bag.
Furthermore, the chemical solution supplied by the chemical solution supply means may be a contrast agent.
Also, the contrast agent may be an MRI contrast agent.

As described above in detail, according to the present invention, “when a patient who administers a drug solution is inside a CT scanner, an MRI scanner or the like”, “when a syringe which administers a drug solution is a prefilled syringe” , "When administering a drug solution through a catheter inserted deep in the patient's body" or "Syringe or injection line to prevent exposure of the operator when administering radiopharmaceuticals" In the case where the blood vessel is not secured in this case, it is possible to easily detect this and prevent the chemical solution from leaking out of the blood vessel. There is merit to be released.
In addition, since it is not necessary to pull the plunger of the syringe immediately before the administration of the chemical solution, a smooth and efficient medical practice can be realized.
According to the inventions of claims 2 and 4, when the injection speed of the chemical liquid becomes faster than the set normal injection speed, and the pressure of the chemical liquid exceeds the set pressure, the chemical liquid cannot be injected, Infusion of the medicinal solution in the above state can be prevented, and the patient is not burdened greatly.
Further, the above abnormality can be easily known on the hand side, and it is not necessary to visually confirm this abnormality.
According to invention of Claim 11, it can assist that a spool slides to the interruption | blocking position by the auxiliary | assistant part which consists of elastic materials.
According to invention of Claim 12 and Claim 31, the pressure of the chemical | medical solution at the time of interrupting | blocking the connection of an inflow port and an outflow port can be set.
According to invention of Claim 13 and Claim 32, the pressure of the chemical | medical solution at the time of interrupting | blocking the connection of an inflow port and an outflow port can be set freely.
According to the eighteenth aspect of the invention, since the operating force for sliding the spool is large, the practitioner can more reliably recognize that the operating mechanism is being operated.
According to the nineteenth aspect of the present invention, since the operating force for sliding the spool becomes larger, the practitioner can more reliably recognize that the operating mechanism is being operated.
According to the invention of claim 20, claim 21, and claim 33, the practitioner can easily know that the connection between the inflow port and the outflow port has been blocked by visually recognizing the notification section or the insulator. .

FIG. 1 is a sectional view showing a first embodiment of the present invention.
2 is an operational state diagram of FIG.
FIG. 3 is a sectional view showing a second embodiment of the present invention.
FIG. 4 is an operational state diagram of FIG.
FIG. 5 is a sectional view showing a third embodiment of the present invention.
6 is an operational state diagram of the spool of FIG.
7 is an operational state diagram of the setting mechanism of FIG.
FIG. 8 is a sectional view showing a fourth embodiment of the present invention.
FIG. 9 is an operational state diagram of FIG.
FIG. 10 is a sectional view showing a fifth embodiment of the present invention.
FIG. 11 is an operational state diagram of FIG.
12 is a cross-sectional view taken along line AA in FIG.
FIG. 13 is a sectional view showing a sixth embodiment of the present invention.
FIG. 14 is an operational state diagram of FIG.
FIG. 15 is a sectional view showing a seventh embodiment of the present invention.
FIG. 16 is an operational state diagram of FIG.
FIG. 17 is a front view showing an eighth embodiment of the present invention.
FIG. 18 is a plan view of FIG.
FIG. 19 is a bottom view of FIG.
FIG. 20 is a left side view of FIG.
FIG. 21 is a right side view of FIG.
FIG. 22 is a front sectional view of FIG.
FIG. 23 is an operational state diagram of FIG.
FIG. 24 is an operational state diagram of FIG.
FIG. 25 is a front sectional view showing a ninth embodiment of the present invention.
FIG. 26 is an operational state diagram of FIG. 25.
FIG. 27 is an operational state diagram of FIG. 25.
FIG. 28 is a front sectional view showing a tenth embodiment of the present invention.
FIG. 29 is a side view showing an eleventh embodiment of the present invention.
FIG. 30 is an operational state diagram of FIG. 29.
FIG. 31 is a sectional view taken along line BB in FIG. 29.
FIG. 32 is a cross-sectional view taken along the line CC of FIG.
FIG. 33 is a sectional view taken along the line DD of FIG.
FIG. 34 is a longitudinal sectional view showing a twelfth embodiment of the present invention.
FIG. 35 is a side view showing a thirteenth embodiment of the present invention.
FIG. 36 is an operational state diagram of FIG. 35.
FIG. 37 is a cross-sectional view taken along line EE in FIG.
FIG. 38 is a cross-sectional view taken along line FF in FIG. 36.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Spool 3 Operating means 10,210 Spool hole 11,21 Opposite part 12,212 Inflow port 13,213 Outflow port 19,17 Upper / lower land 20,122,220 Notification part 21,124,221 Inflow for operation Part 25 Groove 26 Flow path 33 Setting mechanism 40 Inlet side operation port 49 Outlet side operation port 50 Auxiliary body 120, 118, upper / lower land 122 Notification part 125 Groove 128 Circumferential groove 131 Insulator 132 Return spring 145, 143 Upper / Lower-side small-diameter land 147 Large-diameter land 150, 149 Upper / lower side structures 203, 204 First and second members 205 Lid 208 Tip mounting part 209 Injection line mounting part 214 Connection part 215 Gap 225 Communication path 233 Setting mechanism 241 ~ 244 1st to 4th land 245 Shield Use groove 246 connection groove

The present invention, whether the blood vessel is secured, whether be easily detected, to provide a chemical solution administration set with extravasation Ru prevents drug solution supply control device and a device for chemical.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings of FIGS. 1 and 2. A chemical liquid supply control device is provided between a chemical liquid supply means (chemical liquid supply line) (not shown) and an injection line (not shown). It is interposed and has a housing 1 and a spool (gasket) 2 and the like.

  The chemical solution supply means means a medical device for administering a chemical solution into a blood vessel of a living body, and can include an injection syringe, an infusion bag, an infusion bottle, and the like, but is not limited thereto. . The chemical solution supply means includes a syringe already filled with a chemical solution (a prefilled syringe), a bag filled with a chemical solution, a drip bottle filled with a chemical solution, and the like.

  In this specification, the drug solution is a solution, suspension, emulsion, etc. that is directly applied to the blood vessel of the living body through the skin or the like, and is used for treatment or diagnosis of various diseases, nutrient solution, It means physiological saline and other medical solutions, but is not limited to these. In addition, as a chemical | medical solution used for the diagnosis of various diseases, contrast agents, such as a MRI contrast agent, an X-ray contrast agent, and an ultrasonic contrast agent, and various diagnostic agents can be mentioned.

  As the injection line, an injection needle that can be attached to the tip of a syringe, an indwelling needle already placed in a blood vessel, a line extending from a catheter, or the like is used. The “injection” includes so-called “infusion” in which a large amount (100 ml or more) of a drug solution is administered for a long time.

  The housing 1 is made of plastic and has a main body 4 and a lid 5.

  The main body 4 includes a cylindrical (hollow) cylindrical portion (cylindrical portion) 7 that is disposed in the vertical direction and opens upward, and an inflow port 12 that will be described later from the middle in the vertical direction of the cylindrical portion 7 to the right side. A cylindrical (hollow) chip mounting portion 8 projecting so as to surround the tube, and a cylinder projecting so as to surround an outflow port 13 described later, from the middle in the vertical direction of the cylindrical portion 7 to the left side An injection line mounting portion 9 having a hollow shape is integrally formed. Note that the tip mounting portion 8 and the injection line mounting portion 9 do not necessarily have to be aligned on the same straight line when viewed in plan, and may be installed at an angle in the circumferential direction of the cylindrical portion 7. .

  The inside of the cylinder part 7 is a spool hole 10 having a vertical axis and opening upward, and the bottom part of the cylinder part 7 is an opposing part 11 facing the lower end surface of the spool 2.

  The tip mounting portion 8 has a syringe (not shown) tip detachably mounted therein, and has a three-way stopcock function (three-way stopcock). The spool port 10 communicates with the inflow port 12 penetratingly formed in the (lateral direction). The inflow port 12 allows the chemical solution from the chemical solution supply means to flow into the spool hole 10 via the tip mounting portion 8. As a method of providing the tip mounting portion 8 with a three-way stopcock function, a method of inserting a three-way stopcock (not shown) capable of arbitrarily changing the flow path of two or more kinds of chemicals into the tip mounting portion 8, and the tip mounting portion 8 itself And a three-way stopcock.

  Here, the reason why the tip mounting portion 8 is provided with the three-way cock function is as follows. That is, even when the drug is safely administered into the blood vessel (in most cases, it is administered into the blood vessel without any problems), a serious allergic reaction such as a decrease in blood pressure may occur against the drug. In such a case, quick response is required. In this case, as in the present invention, if a blood vessel is secured by the three-way stopcock function, emergency treatment by administration of various drugs such as steroids can be performed promptly.

Since the above allergic reaction may occur during the injection of a drug solution or may occur for a while after administration, it is considered desirable to perform a test using the three-way stopcock function.
Further, the role of flushing the drug solution remaining in the administration line is important from the viewpoint of securing an appropriate dose when the dose of the drug solution to be administered is small.

  The tip mounting portion 8 is preferably provided with a flange so that it can be screwed with a female screw of a luer lock adapter (luer lock mechanism) provided in the chemical solution supply means. Further, it is desirable that the connecting portion with the chip mounting portion 8 in the chemical solution supply means has a chip or a portion corresponding to the chip. Further, a tip or a catheter having a portion corresponding to the tip may be attached between the chemical solution supply means and the tip mounting portion 8.

  The injection line mounting part 9 is mounted so that an injection line (not shown) is separable. The injection line mounting part 9 is disposed below the tip mounting part 8 and opens at the left end. It communicates with the spool hole 10 by an outflow port 13 which is formed penetrating in the direction. The outflow port 13 allows the chemical solution in the spool hole 10 to flow out to the injection line mounting portion 9, and is disposed below the inflow port 12. Moreover, it is preferable that the injection line mounting part 9 is provided with a locking mechanism such as a luer lock adapter so that the injection line and the injection line mounting part 9 are not accidentally detached when the injection pressure of the drug solution is high. . Specifically, a catheter, an injection needle, an indwelling needle, and the like are connected to the injection line mounting unit 9.

  The lid body 5 is externally fitted and fixed to the upper end portion of the cylindrical portion 7 to cover the upper end opening of the cylindrical portion 7, and an opening portion 15 is formed through the center portion in the vertical direction. .

  The spool 2 is provided in the spool hole 10 so as to be slidable in the vertical direction (axial direction), and as shown in FIG. 1, the lower end surface of the spool 2 abuts against the facing portion 11 of the housing 1 and the inflow port 12. As shown in FIG. 2, the position can be changed to a position higher than the connection position and a blocking position for blocking the connection, and is inserted into the opening 15 of the lid 5. Has been. As a constituent material of the spool 2, plastic, thermoplastic elastomer, silicon elastomer, butyl rubber, or the like is used, but it is not particularly limited as long as it is an elastic member that has been used as a medical instrument.

  The spool 2 includes a lower land 17, a small diameter portion 18 having a smaller diameter than the lower land 17, an upper land 19 (substantially) the same diameter as the lower land 17, and both lands 17, 19. The informing unit 20 having a small diameter is configured by being connected (integrated) upward in the above order. The small diameter portion 18 may have the same diameter as the lands 17 and 19.

  The lower land 17 has a lower end surface that opposes the facing portion 11 of the housing 1 in the vertical direction, and is an inflow portion 21 for operation between the two, but when the spool 2 is in the connection position, the lower end surface of the spool 2 is It is in contact with the facing portion 11.

  The upper and lower end portions of the outer peripheral portion of the lower land 17 and the lower end portion of the upper land 19 are provided with seal portions 22 to 24 that come into contact (pressure contact) with the inner surface of the spool hole 10 to prevent liquid leakage. Yes. The spool 2 can be held at an arbitrary sliding position by the contact, and when an external force larger than the sliding start external force (set external force) is applied to the spool 2 in the vertical direction, the spool 2 2 is slidable. That is, the seal portions 22 to 24 also have a function as setting means for determining the sliding start external force.

  The seal portions 22 to 24 are usually formed integrally with the spool 2, but may be constituted by a separate seal member. When the spool 2 is in the blocking position, the outflow port 13 is positioned between the upper and lower seal portions 23 and 22 of the lower land 17.

  Between the lands 17 and 19 separated from each other in the axial direction, that is, the radially outer side of the small-diameter portion 18 is a groove (circumferential groove) 25 and is always in communication with the inflow port 12. The port 13 communicates only when the spool 2 is in the connection position.

  The lower portion of the small diameter portion 18 and the lower land 17 are configured with chemical solution supply stopping means (blocking means). This means is that, when the inflow port 12 and the outflow port 13 are connected, when the pressure of the chemical liquid exceeds a set pressure (abnormal pressure), the spool 2 is slid by the pressure of the chemical liquid, The connection of the outflow port 13 is cut off, and the supply of the chemical solution is stopped. Specifically, the flow path 26 is configured as a bypass. The chemical solution supply stopping means may also include the operation inflow portion 21.

  The flow path 26 communicates the groove 25 and the inflow portion 21 for operation, and includes a vertical hole 27 and a horizontal hole 28. The vertical hole 27 is formed in the lower land 17 and a shaft center portion below the small diameter portion 18 and opens downward at the lower end. The lateral hole 28 is formed in the front-rear direction below the small-diameter portion 18, the center part in the front-rear direction communicates with the upper end part of the vertical hole 27, and both front-rear ends open in the front-rear direction. In addition, only one of the front and rear ends of the horizontal hole 28 may be opened.

  Note that, due to the action of the chemical solution supply stop means, a normal injection pressure equal to or lower than the set injection pressure of the chemical solution, that is, a normal pressure increase of the chemical solution due to a syringe needle gauge, a syringe cross-sectional area, etc. An upward external force acts on the spool 2 due to an increase in the pressure of the chemical liquid at the initial sliding of the plunger of the syringe, an increase in the pressure of the chemical liquid due to the normal injection speed of the chemical liquid, etc. The sliding start external force is assumed to be large. In addition, when the blood vessel is not secured at the time of injection and when the injection rate of the chemical solution is equal to or higher than the normal injection rate, a large abnormal injection pressure higher than the set injection pressure of the chemical solution is applied to the spool 2 in the upward direction. Although acting as an external force, the sliding start external force of the spool 2 is made smaller than this external force. That is, the sliding start external force is set to be larger than the normal external force acting on the spool 2 at the time of injection, so that the spool 2 does not slide unexpectedly, but is more than the abnormal external force acting on the spool 2 at the time of injection. It is considered small.

  The upper surface of the upper land 19 comes into contact with the lower end surface of the lid 5 when the spool 2 is in the blocking position.

  The notification unit 20 constitutes a failure notification unit that reports a failure related to the supply of the chemical solution from the chemical solution supply unit to the injection line, and notifies the operation when the chemical solution supply stop unit operates. The notification unit 20 protrudes slightly upward from the housing 1 when the spool 2 is in the connected position (may not be protruded), and protrudes greatly upward from the housing 1 when the spool 2 is in the blocking position. In addition, in order to ensure visual recognition of the alerting | reporting part 20, the alerting | reporting part 20 is colored normally. Further, the sliding of the spool 2 or the operation of the notification unit 20 associated therewith can be changed to an electrical, optical, or acoustic signal to be notified. Examples of means for reporting in place of electrical, optical or acoustic signals include bells, light bulbs, light-emitting diodes, buzzers, and sound-generating plates.

  In the above configuration example, at the time of injection, the injection line mounting unit 9 is mounted with an injection needle that can be mounted on the tip of a syringe, an indwelling needle already placed in a blood vessel, or an injection line extending from a catheter. 8, a syringe tip filled with a chemical solution is mounted as a chemical solution supply means. The spool 2 is in the connection position shown in FIG. 1, and the inflow port 12 and the outflow port 13 are connected by the groove 25.

  Prior to injection, first, the plunger of the syringe is pressed to fill the flow path to the patient, that is, the tip mounting portion 8, the spool hole 10, the injection line mounting portion 9, and the inside of the injection line, and the above-mentioned After so-called “priming” for removing the internal air, the injection needle of the injection line is punctured into the blood vessel of the patient. The priming may be performed with physiological saline.

  Next, the plunger of the syringe is pressed. At this time, the blood vessel is secured, that is, the injection needle of the injection line is surely pierced into the blood vessel, the injection line is connected to the blood vessel, and the drug solution When the injection speed is the normal injection speed, the spool 2 is held at the connection position as described below, so that the drug solution flows into the blood vessel and normal injection can be performed.

  That is, due to the action of the chemical solution supply stop means, the normal injection pressure below the set injection pressure of the chemical solution, that is, the normal pressure rise of the chemical solution due to the syringe needle gauge, syringe cross-sectional area, etc. at the time of injection, for example, An upward external force acts on the lower end surface of the spool 2 due to an increase in the pressure of the chemical liquid at the initial sliding of the plunger of the syringe and an increase in the pressure of the chemical liquid due to the normal injection speed of the chemical liquid. However, since the external force for starting the sliding of the spool 2 is larger than the external force, there is no fear that the spool 2 will slide unexpectedly, and the normal injection can be performed as described above.

  However, if the blood vessel is not secured in the initial stage of injection, that is, if the injection needle of the injection line is not punctured and the injection line is not connected to the blood vessel, the set injection pressure of the drug solution The large abnormal injection pressure described above acts on the lower end surface of the spool 2 via the flow path 26, and the upward external force acting on the spool 2 becomes equal to or greater than the sliding start external force.

  As a result, the spool 2 slides upward, and the chemical solution of the syringe continues to flow into the operation inflow portion 21 via the tip mounting portion 8 and the outflow port 13, and the spool 2 is shown in FIG. It becomes a blocking position, the connection between the inflow port 12 and the outflow port 13 is blocked, and the notification unit 20 protrudes greatly from the housing 1.

  As a result, the plunger of the syringe cannot be pressed, and the medical solution is not forcibly injected into a non-necessary portion, so that the patient does not feel significant pain. In other words, the patient can smoothly receive the necessary medical treatment, and can prevent additional medical treatment such as medical treatment due to leakage of the drug solution outside the blood vessel. Expected to increase efficiency.

  Further, as described above, the plunger of the syringe can no longer be pressed, so that the practitioner can easily know from the hand side that the above-mentioned abnormality, that is, the blood vessel is not secured. Since 20 protrudes greatly from the housing 1, the practitioner can easily recognize this, and this also allows the user to easily know that a blood vessel is not secured.

  At this time, if the plunger of the syringe is pulled, the chemical solution in the tip mounting portion 8 and the like can be returned into the syringe. Also in this aspect, the chemical solution can be prevented from being wasted and an increase in medical cost can be prevented. Note that when the plunger of the syringe is pulled, the pressure of the chemical solution in the operation inflow portion 21 is reduced, and the spool 2 may return to the connection position. The notification part 20 may be pressed downward to return the spool 2 to the connection position. At this time, if a part of the injection line is closed with fingers or the like and then the above operation is performed, the drug solution in the operation inflow portion 21 can be returned to the syringe again.

  Then, the above series of operations is performed again from the beginning, and after confirming that blood vessels are secured, injection is performed as in the conventional case.

  In the present configuration example, as described above, when the blood vessel is not secured, the drug solution cannot be administered. Therefore, just before the drug solution is administered, the plunger of the syringe is pulled, so that blood flows backward to the injection line. There is no need to visually check “flashback” to see if blood vessels are secured.

  Therefore, even when a patient is inside the apparatus and it is necessary to inject a drug solution into the blood vessel at high speed in CT examination or MRI examination, the examination can be performed without anxiety that the drug solution leaks out of the blood vessel. Become. Further, even when the drug solution is administered through the catheter, there is no possibility that the same problem as described above may occur even when the catheter is inserted into the deep part of the patient. Furthermore, even if the syringe that administers the medicinal solution is often unable to pull the plunger before administration, the above-described problem does not occur even if the syringe is filled with a medicinal solution (prefilled syringe). In addition, when administering radiopharmaceuticals, the syringe and injection line may be covered with a protective wall to prevent exposure to the practitioner. There is no problem because there is no need to check.

  Also, depending on the type of the chemical solution, there is a chemical solution with a maximum injection rate, but in contrast to this, the chemical solution is not injected at a rate faster than the normal injection rate as described below. . That is, when the injection speed of the chemical liquid becomes higher than the normal injection speed after the initial stage of the injection, a large abnormal injection pressure equal to or higher than the set injection pressure of the chemical liquid is applied to the spool 2 via the flow path 26 as described above. The upward external force acting on the lower end surface and acting on the spool 2 becomes equal to or greater than the sliding start external force. As a result, the spool 2 is in the blocking position, so that it is impossible to inject the chemical liquid, so that a large burden is not imposed on the patient, and the notification section 20 notifies this, so that the practitioner can inject the normal liquid injection speed. You can easily know that it is faster than the speed. Therefore, the practitioner may return the spool 2 to the connection position, and then press the plunger of the syringe at a speed slower than before, and inject the chemical liquid using the injection speed of the chemical liquid as a normal injection speed.

  3 and 4 show a second embodiment of the present invention, wherein an upper seal portion 31 is provided at the upper end portion of the upper land 19 of the spool 2, and the upper land 19 has a space between the seal portions 24, 31. The distance is set larger than the distance between the connecting position and the blocking position of the spool 2. As a result, the sliding area of the lower seal portion 24 on the inner surface of the spool hole 10 is protected from contamination by outside air, and the risk of contamination of the chemical solution is reduced.

  5 to 7 show a third embodiment of the present invention, which is provided with a setting mechanism (means) 33 for setting a sliding start external force of the spool 2 and configured as follows.

  That is, a circumferential protrusion 34 that projects radially outward is integrally formed at a midway portion in the axial center direction of the notification portion 20 of the spool 2.

  Further, an adjustment cylinder 35 that is externally fitted to the upper part of the notification part 20 of the spool 2 is externally fitted and fixed to the upper end of the cylindrical part 7 of the housing 1. The adjustment cylinder 35 is integrally formed of a material that can be elastically deformed, and a tapered screw portion 36 that is tapered upward is formed on the outer peripheral surface of the lower portion thereof. Further, a circumferential projection 37 protruding inward in the radial direction is integrally formed at a midway portion in the axial direction of the inner circumferential surface of the adjustment cylinder 35, and the circumferential projection 37 is disposed above the circumferential projection 34 of the spool 2. Has been. Furthermore, a slit 45 formed in a radial direction is disposed in a portion extending from the upper end of the adjustment cylinder 35 to the lower end of the circumferential protrusion 34. As the constituent material of the adjustment cylinder 35, the same material as the spool 2 is used.

  The lid 5 is externally fitted to the adjustment cylinder, and a female screw portion 38 on the inner periphery thereof is screwed to the taper screw portion 36. As shown in FIGS. 5 and 7, the lid 5 is attached to the adjustment cylinder 35. As the screw advances and retracts, the slit 45 of the adjustment cylinder 35 expands and contracts in the circumferential direction, and the inner diameter of the circumferential protrusion 37 expands and contracts. The adjustment cylinder 35 may be formed with a normal screw portion instead of the taper screw portion 36, and the lid 5 may be formed with a taper screw portion.

  In the above configuration example, when the spool 2 moves from the connection position shown in FIG. 5 to the blocking position shown in FIG. 6, the circumferential protrusion 37 of the adjustment cylinder 35 and / or the circumferential protrusion 34 of the spool 2 is elastically deformed. The circumferential protrusion 34 of the spool 2 needs to pass through the inside of the circumferential protrusion 37 of the adjustment cylinder 35. Therefore, as shown in FIGS. 5 and 7, the external force required for the circumferential projection 34 of the spool 2 to pass through the inside of the circumferential projection 37 of the adjustment cylinder 35 by expanding and reducing the inner diameter of the circumferential projection 37 of the adjustment cylinder 35. That is, the sliding start external force can be set freely.

  8 and 9 show a fourth embodiment of the present invention. The housing 1 has a main body 4, an injection line mounting body 39, a lid body 5 and the like.

  The inflow port 12 is formed in the lower portion of the cylindrical portion 7 and communicates with the groove 25 of the spool 2 when the spool 2 is in the connection position as shown in FIG. 8, but as shown in FIG. Is in communication with the inflow portion 21 for operation. The outflow port 13 is higher than the inflow port 12 and is always in communication with the groove 25 of the spool 2. An inlet side operation port 40 located below the inflow port 12 is formed in the cylindrical portion 7 so as to penetrate in the left-right direction, and the tip mounting portion 8 and the operation inflow portion 21 are communicated with each other.

  The injection line mounting body 39 can be disposed at substantially the same position as the chip mounting portion 8 in the vertical direction, and is fixed to the left side surface of the cylindrical portion 7, and the communication path 41 in the vertical direction is provided between them. The communication path 41 and the outflow port 13 communicate with each other, and a communication hole 42 that communicates with the communication path 41 and the inside of the injection line mounting body 39 is formed through the right end of the injection line mounting body 39 in the left-right direction. ing.

  Further, the axial length of the lower land 17 of the spool 2 is small. A plurality of seal portions 43 may be provided. However, in order to increase the sealability, a single seal portion 43 is preferably used, and a protrusion 44 that abuts the facing portion 11 is formed on the lower end surface of the spool 2. Even when the spool 2 is in the connection position, most of the lower end surface of the spool 2 is separated from the facing portion 11.

  According to the above configuration example, when the injection pressure of the chemical liquid becomes equal to or higher than the set injection pressure at the time of injection, the chemical liquid in the chip mounting portion 8 first flows into the operation inflow portion 21 via the inlet side operation port 40. Then, the spool 2 starts to slide upward. Thereafter, the communication between the inflow port 12 and the groove 25 of the spool 2 is cut off, the inflow port 12 is also communicated with the operation inflow portion 21, and the chemical solution also flows into the operation inflow portion 21 from the inflow port 12. As a result, the spool 2 slides to a predetermined blocking position shown in FIG.

  10 to 12 show a fifth embodiment of the present invention, in which the tip mounting portion 8 and the injection line mounting portion 9, the inflow port 12 and the outflow port 13 are (substantially) the same position in the vertical direction. Has been. Further, longitudinal seal portions 46 in the axial direction are arranged at equal intervals in the circumferential direction between the upper and lower seal portions 23, 22 of the lower land 17, and a plurality of sections are formed between the upper and lower seal portions 23, 22. When the spool 2 is in the shut-off position, the inflow port 12 and the outflow port 13 communicate with different compartments 47, and the connection between the inflow port 12 and the outflow port 13 is shut off. Is done.

  13 and 14 show a sixth embodiment of the present invention. Like the fourth embodiment, the housing 1 has a main body 4, an injection line mounting body 39, a lid body 5 and the like. Only the differences will be described below.

  First, the inflow port 12 is formed in the midway portion in the vertical direction of the cylindrical portion 7, and is always in communication with the groove 25 of the spool 2. Further, the outflow port 13 is formed on the lower side of the cylindrical portion 7 and is lower than the inflow port 12, and as shown in FIG. 13, when the spool 2 is in the connection position, it communicates with the groove 25 of the spool 2. However, as shown in FIG. 14, when the spool 2 is in the shut-off position, it communicates with the inflow portion 21 for operation.

  An outlet side operation port 49 positioned below the outflow port 13 is formed in the cylindrical portion 7 so as to penetrate in the left-right direction and communicate with the operation inflow portion 21. A communication path 41 between the cylindrical portion 7 and the injection line mounting body 39 communicates with the outflow port 13 and the outlet side operation port 49. Further, the main portion, that is, the portion (or all) except the outer peripheral portion in the facing portion 11 of the housing 1 is an auxiliary body 50 made of an elastic material such as rubber.

  According to the above configuration example, when the injection pressure of the drug solution becomes equal to or higher than the set injection pressure at the time of injection, the drug solution in the injection line mounting body 39 first enters the operation inflow portion 21 via the outlet side operation port 49. The auxiliary body 50 is elastically deformed downward by flowing in and the pressure of the chemical solution. Thereafter, the spool 2 slides upward due to the pressure of the chemical solution, the connection between the outflow port 13 and the groove 25 is cut off, and the outflow port 13 communicates with the operation inflow portion 21. Then, due to the pressure of the chemical solution and the elastic restoring force of the auxiliary body 50, the spool 2 slides further upward, and the spool 2 becomes the predetermined blocking position shown in FIG.

  In the above configuration example, when the spool 2 slides and the connection between the outflow port 13 and the groove 25 is cut off, no chemical is supplied from the tip mounting portion 8 into the operation inflow portion 21. At first glance, it seems that there is a problem in the “reliable sliding” to the blocking position, but the spool 2 surely slides to the predetermined blocking position by the above action of the auxiliary body 50. In this example, even if the auxiliary body 50 is not provided, there is actually no problem, but the auxiliary body 50 is provided in order to further improve the reliability.

  15 and 16 show a seventh embodiment of the present invention, which is a modification of the first embodiment, and only the differences will be described next. First, the tip mounting portion 8 is slightly higher than the injection line mounting portion 9. The outflow port 13 is also used as an outlet-side operation port, is formed at the lower end of the cylindrical portion 7, and is always in communication with the operation inflow portion 21. Further, the main portion, that is, the portion (or all) except the outer peripheral portion in the facing portion 11 of the housing 1 is an auxiliary body 50 made of an elastic material such as rubber. Further, a protrusion 44 that contacts the facing portion 11 is formed on the lower end surface of the spool 2, and most of the lower end surface of the spool 2 is separated from the facing portion 11 even when the spool 2 is in the connection position. Yes.

  According to the above configuration example, the drug solution that has flowed into the groove 25 of the spool 2 from the inflow port 12 at the time of injection enters the injection line mounting portion 9 via the flow path 26, the operation inflow portion 21, and the outflow port 13. Inflow. At this time, when the injection pressure of the chemical liquid becomes equal to or higher than the set injection pressure, the auxiliary body 50 is elastically deformed downward by the pressure of the chemical liquid in the operation inflow portion 21. Thereafter, the spool 2 slides upward due to the pressure of the chemical solution, and the communication between the inflow port 12 and the groove 25 is blocked. Then, due to the pressure of the chemical solution and the elastic restoring force of the auxiliary body 50, the spool 2 slides further upward, and the spool 2 becomes the predetermined blocking position shown in FIG. In this example as well, even if the auxiliary body 50 is not provided, there is actually no problem, but the auxiliary body 50 is provided in order to further improve the reliability.

  13 and 14, the outflow port and the outlet side operation port are provided separately. However, as shown in FIGS. 1 to 11, 15, and 16, the outflow port and the outlet side operation port may be combined. . 8 and 9, the inflow port and the inlet side operation port are provided separately. However, as shown in FIGS. 1 to 7, 10, 11, and 13 to 16, the inflow port and the inlet side operation port are provided. The port may be shared.

  17 to 24 show an eighth embodiment of the present invention, and the chemical supply control apparatus has an operation means 3 in addition to the housing 1 and the spool 2. Although the main body 4 of the housing 1 is transparent, the lid 5 of the housing 1 may also be transparent.

  The spool 2 can be changed in position between a connection position shown in FIG. 22 and a blocking position shown in FIG. The spool 2 includes a lower end portion 117, a lower land 118, an intermediate portion 119, an upper land 120, a stopper portion 121, a notification portion 122, and a shaft portion 123 that are connected upward in the above order. It is configured by installation (integral formation). The upper and lower lands 120 and 118 have the same diameter, and the other part of the spool 2 has a smaller diameter. The lower end portion 117 and the lower end surface of the lower land 118 are opposed to the opposing portion 11 of the housing 1 in the vertical direction, and the gap between them is an operation inflow portion 124, and the operation inflow portion 124 is connected to the operation port 14. However, when the spool 2 is in the connection position, the lower end portion 117 is in contact with the facing portion 11. The operation port 14 constitutes a chemical solution supply stop means. The chemical solution supply stop means may include an operation inflow portion 124.

  The outer peripheral portions of the lower land 118 and the upper land 120 are in contact (pressure contact) as a seal portion in a liquid-tight state (airtight state) so as to be slidable in the axial direction on the inner surface of the spool hole 10. The spool 2 can be held at an arbitrary sliding position by the contact, and when an external force larger than the sliding start external force (set external force) is applied to the spool 2 in the vertical direction, the spool 2 2 is slidable. That is, the seal portions on the outer periphery of the lower land 118 and the upper land 120 also have a function as setting means for determining the sliding start external force. These seal portions are usually formed integrally with the lower land 118 and the upper land 120, but may be constituted by separate seal members.

  Between the lower land 118 and the upper land 120, that is, the radially outer side of the intermediate portion 119 is a groove (circumferential groove) 125, and is always in communication with the inflow port 12, Are in communication only when the spool 2 is in the connected position.

  The upper surface of the stopper portion 121 comes into contact with the lower end surface of the lid 5 when the spool 2 is in the blocking position.

  The shaft portion 123 has a smaller diameter than that of the notification portion 122, and a ring portion 127 that protrudes radially outward is formed on the entire middle portion of the shaft portion 123. The ring portion 127 and the notification portion The space 122 is a circumferential groove 128.

  The operation means 3 constitutes, together with the engagement means described later, a trouble notification means for notifying a trouble related to the supply of the chemical liquid from the chemical liquid supply means to the injection line. It is separate from the means. The operation means 3 includes a support base 130, a lever 131, and a return spring 132. The support base 130 is integrally formed with the lid 5 of the housing 1, and a support portion 133 is erected on the support base 130, and a pair of support shafts 134 project from the support portion 133 in the front-rear direction. Has been. The insulator 131 is mounted on the support portion 133 at a longitudinally intermediate portion thereof, and is detachably engaged with the support shaft 134 through elastic deformation. The insulator 131 is swingable with respect to the housing 1 by the support shaft 134. It is pivotally supported by. The front end portion of the lever 131 is a bifurcated engagement portion 135, and both front and rear side portions of the engagement portion 135 are detachably engaged with the circumferential groove 128 of the spool. The part 135 and the circumferential groove 128 constitute engaging means for detachably engaging the operating means 3 and the spool. In order to release the engagement of the engagement means, it is necessary to cause the engagement portion 135 to get over the ring portion 127 by applying an external force equal to or higher than the upward setting operation force. The set operating force is set to be larger than the sliding start external force of the spool 2. The return spring 132 returns the swinging lever 131 to the original position, is integrally formed in a curved shape at the base portion of the lever 131, and is elastically interposed between the base portion of the lever 131 and the support base 130. Thus, the base of the insulator 131 is biased upward.

  In the above configuration example, at the time of injection, the injection line mounting unit 9 is mounted with an injection needle that can be mounted on the tip of a syringe, an indwelling needle already placed in a blood vessel, or an injection line extending from a catheter. 8, a syringe tip filled with a chemical solution is mounted as a chemical solution supply means. Further, the spool 2 is in the connection position shown in FIG. 22, and the inflow port 12 and the outflow port 13 are connected by the groove 125.

  Prior to injection, first, the plunger of the syringe is pressed to fill the flow path to the patient, that is, the tip mounting portion 8, the spool hole 10, the injection line mounting portion 9, and the inside of the injection line, and the above-mentioned After so-called “priming” for removing the internal air, the injection needle of the injection line is punctured into the blood vessel of the patient. The priming may be performed with physiological saline.

  Next, in order to confirm whether or not a blood vessel is secured, the base portion of the insulator 131 is pushed down, and an upward operating force is applied to the spool 2. At this time, when the blood vessel is secured, that is, when the injection needle of the injection line is securely punctured and the injection line is connected to the blood vessel (in other words, when the injection line is in an open state) As shown in FIG. 23, the spool 2 slides upward, and due to the negative pressure generated along with this, the drug solution or the like in the injection line first enters the operation inflow portion 124 via the operation port 14. Then, it flows into the operation inflow portion 124 via the operation port 14 and the outflow port 13. As a result, the so-called “flashback” in which the blood flows back to the injection line can be visually observed, and it can be confirmed that the blood vessels are secured. When the operating force of the lever 131 is released, the lever 131 is swung to the original position by the return spring 132, and the spool 2 is lowered while pushing out the drug solution to the injection line mounting portion, and returns to the connection position. This allows normal injection.

  In addition, when an upward operation force is applied to the spool 2 by pushing down the base portion of the insulator 131, when the blood vessel is not secured, that is, the injection needle of the injection line is not punctured, and the injection line is When it is not connected to the blood vessel (in other words, when the injection line is in a closed state), the spool 2 cannot be slid upward, and the drug solution or the like in the injection line cannot be moved into the operation inflow portion 124. Can not be sucked. When the operating force of the lever 131 exceeds the set operating force, as shown in FIG. 24, the engaging portion 135 of the lever 131 is disengaged from the circumferential groove 128 of the spool 2, gets over the ring portion 127, and above it. By this, the practitioner can easily know that the blood vessel is not secured. When the operating force of the lever 131 is released, the base portion of the lever 131 tends to swing upward by the return spring 132, but the engaging portion 135 of the lever 131 is in contact with the ring portion 127 of the spool 2. Therefore, the insulator 131 does not return to the original position, and it can be visually recognized from the position of the insulator 131 that a blood vessel is not secured.

  As a result, the practitioner does not press the plunger of the syringe, so that the medical solution is not forcibly injected into a portion that is not a necessary site, and the patient does not feel significant pain. In other words, the patient can smoothly receive the necessary medical care, and can prevent additional medical actions such as a therapeutic action associated with leakage of the drug solution from the blood vessel. However, it is expected that efficiency will increase.

  As described above, the practitioner can easily know from the hand side that the blood vessel is not secured, so after performing the above series of operations from the beginning again and confirming that the blood vessel is secured The injection is carried out in the conventional manner as follows.

  That is, the plunger of the syringe is pressed. At this time, when the injection speed of the chemical liquid is the normal injection speed, the spool 2 is held at the connection position, so that the chemical liquid flows into the blood vessel, You can make street injections.

  In this case, the normal injection pressure equal to or lower than the set injection pressure of the drug solution, that is, the normal pressure increase of the drug solution due to the gauge of the syringe needle, the cross-sectional area of the syringe, etc. at the time of injection, for example, the sliding of the plunger of the syringe An upward external force acts on the lower end surface of the spool 2 via the outlet side operation port 14 due to an increase in the pressure of the chemical liquid in the initial stage of movement and an increase in the pressure of the chemical liquid due to the normal injection speed of the chemical liquid. However, since the external force for starting the sliding of the spool 2 is larger than the external force, there is no fear that the spool 2 will slide unexpectedly, and the normal injection can be performed as described above.

  Also, depending on the type of the chemical solution, there is a chemical solution with a maximum injection rate, but in contrast to this, the chemical solution is not injected at a rate faster than the normal injection rate as described below. . That is, when the injection speed of the chemical liquid becomes faster than the normal injection speed, the chemical liquid in the injection line mounting portion 9 first flows into the operation inflow portion 124 via the outlet side operation port 14 and the pressure of the chemical liquid Acts on the spool 2, and the upward external force acting on the spool 2 is equal to or greater than the sliding start external force. As a result, as shown in FIG. 23, the spool 2 slides upward to reach the blocking position, and the lever 131 swings, so that the medicinal solution cannot be injected, so that a large burden is not imposed on the patient. In addition, since the notifying part 122 and the swinging insulator 131 that greatly protrude upward from the lid are notified of this, the practitioner can easily confirm that the injection speed of the chemical solution is faster than the normal injection speed. You can find out at Therefore, the practitioner returns the spool 2 to the connection position by pressing the insulator 131 or the spool 2, and then presses the plunger of the syringe at a slower speed than before, and sets the injection speed of the drug solution as the normal injection speed. What is necessary is just to inject a chemical solution.

  Therefore, even when a patient is inside the apparatus and it is necessary to inject a drug solution into the blood vessel at high speed in CT examination or MRI examination, the examination can be performed without anxiety that the drug solution leaks out of the blood vessel. Become. Further, even when the drug solution is administered through the catheter, there is no possibility that the same problem as described above may occur even when the catheter is inserted into the deep part of the patient. Furthermore, even if the syringe that administers the medicinal solution is often unable to pull the plunger before administration, the above-described problem does not occur even if the syringe is filled with a medicinal solution (prefilled syringe). In addition, when administering radiopharmaceuticals, the syringe and injection line may be covered with a protective wall to prevent exposure to the practitioner. There is no problem because there is no need to check.

  FIGS. 25 to 27 show a ninth embodiment of the present invention, in which the spool hole 10 of the housing 1 has a small diameter portion 141 on the lower side and a large diameter on the upper side that is larger in diameter than the small diameter portion 141. Part 142. The spool 2 includes a lower end portion 117, a lower small-diameter land 143, a lower intermediate portion 144, an upper small-diameter land 145, an upper intermediate portion 146, a large-diameter land 147, a notification portion 122, and a shaft portion. 123 is configured by connecting them upward in the above order. The upper and lower small-diameter lands 145 and 143 have the same diameter and are larger in diameter than the lower end portion 117, the upper and lower intermediate portions 146 and 144, and the shaft portion 123, and the notification portion 122 has a larger diameter. The large-diameter land 147 has the largest diameter. The upper and lower small-diameter lands 145 and 143 are slidably provided in the small-diameter portion 141, and the large-diameter land 147 is slidably provided in the large-diameter portion 142. The distance between the small-diameter lands 145 is larger than the distance between the connecting position and the blocking position of the spool 2. Thereby, the sliding area of the upper small-diameter land 145 on the inner surface of the spool hole 10 is protected from contamination by outside air, and the possibility of contamination of the chemical liquid is reduced. The large-diameter land 147 is also used as the stopper portion of the first embodiment.

  In the above configuration example, when a downward operation force is applied to the base portion of the insulator 131 when confirming whether or not a blood vessel is secured, negative pressure also acts on the lower surface of the large-diameter land 147. Therefore, the operating force for sliding the spool 2 upward is correspondingly increased, and the practitioner himself can recognize that the lever 131 is being operated.

  FIG. 28 shows a tenth embodiment of the present invention, in which the spool 2 is divided between an upper intermediate portion 146 and a large-diameter land 147, and comprises a lower structure 149 and an upper structure 150.

  In the above configuration example, at a normal time such as when a blood vessel is secured, when the upper structural body 150 is lifted, the lower structural body 149 is lifted by the negative pressure acting between the lower structural body 149, and When the upper structure 150 is lowered, the lower structure 149 is lowered by the pressing. Further, when confirming whether or not a blood vessel is secured, if a downward operating force is applied to the base of the insulator 131, a negative force acting on the lower end surface of the large-diameter land 147 of the upper structure 150 is applied. The pressure is “the negative pressure acting on the lower end surface of the lower structure 149 and the area ratio of both lower end surfaces” ((the area of the lower end surface of the large-diameter land 147) / (the lower end portion 117 of the spool 2 and the lower small-diameter land 143). ) Or (largest cross-sectional area of the large-diameter land 147) / (maximum cross-sectional area of the lower-side small-diameter land 143) ". The operating force for sliding upward is greater than in the ninth embodiment, and the practitioner himself can recognize that the lever 131 is being operated even more reliably than in the ninth embodiment.

  FIGS. 29 to 33 show an eleventh embodiment of the present invention. The housing 1 is made of transparent plastic and has first and second members 203 and 204 and a lid 205.

  As shown in FIGS. 31 to 33, the first member 203 has a bottomed cylindrical shape that opens rearward in the axial direction (front-rear direction), and the front end portion of the first member 203 faces the front end portion of the spool 2. 211 and the inside thereof is a spool hole 210 in the axial direction. An outflow port 213 is formed through the side wall portion on the distal end side of the first member 203 in the radial direction, and the port 213 communicates with the spool hole 210.

  The second member 204 has a substantially cylindrical shape that opens both in the axial direction, and includes a base-side connection portion 214 and a distal-end-side injection line mounting portion 209 that has a smaller diameter than the connection portion 214. It is integrally molded. The connection portion 214 is externally fixed to the first member 203 from the front end side, and the outflow port 213 is included in the connection portion 214, and the outflow port 213 is provided in the gap 215 between the first and second members 203 and 204. Via the injection line mounting portion 209.

  The lid 205 regulates the sliding of the spool 2 toward the rear side in the axial direction. The lid 205 is externally fixed to the base end portion of the first member 203, and an opening 217 is vertically arranged at the center portion thereof. The inner periphery of the first member 203 protrudes radially inward from the first member 203.

  The spool 2 is inserted into the spool hole 210 from the rear in the axial direction, is provided in the spool hole 210 so as to be slidable in the axial direction, and the connection position where the tip end portion of the spool 2 abuts against the facing portion 211 of the first member 203. (Refer to FIG. 29 and FIG. 31) and the position can be changed to a blocking position (see FIG. 30 and FIG. 33) described later. The spool 2 includes a base portion 219 and a sealing member 222 provided at the tip portion of the base portion 219, and a gap between the tip portion of the spool 2 and the facing portion 211 of the first member 203 serves as an operation inflow portion 221. Yes.

  The base portion 219 constitutes most of the spool 2 and has a substantially cylindrical shape, and a through hole 224 is formed in the axial direction. The tip of the through hole 224 is a communication passage 225, and the tip of the communication passage 225 is an operation port 226 that is always in communication with the operation inflow portion 221. An abutting portion 229 that protrudes outward in the radial direction and is positioned in front of the lid 205 in the axial direction is formed in the middle portion of the base portion 219 in the axial direction. As shown in FIG. The position where the 229 contacts the front surface of the lid 205 is the blocking position of the spool 2. The base part of the base part 219 is a chip mounting part 208 and protrudes greatly rearward in the axial direction from the lid 205. The chip mounting portion 208 is provided with a flange 227 that is screwed with a luer lock adapter provided in the chemical solution supply means.

  An informing portion 220 is formed on the outer peripheral surface of the tip portion of the chip mounting portion (or the tip portion and its vicinity). The notification unit 220 is located inside the housing 1 when the spool 2 is in the connection position, and protrudes rearward in the axial direction from the housing 1 when the spool 2 is in the blocking position.

  The sealing member 222 is fitted and fixed to the distal end portion of the base portion 219 through elastic deformation, and is housed in the spool hole 210. The sealing member 222 and the side wall portion of the distal end portion of the base portion 219 are attached to the sealing member 222. The inflow port 212 communicates with the communication passage 225 and the spool hole 210 and is connected to the outflow port 213 so as to be able to be intermittently connected by sliding of the spool 2. On the outer peripheral portion of the sealing member 222, the first to fourth lands 241 to 244 are arranged side by side in the axial direction from the distal end portion to the base end portion, and these outer peripheral portions serve as seal portions. The inner surface of the spool hole 210 is in contact (pressure contact) in a liquid-tight state (airtight state) so as to be slidable in the axial direction. The spool 2 can be held at an arbitrary sliding position by the contact, and an external force larger than an external force (sliding start external force, set external force) necessary for sliding the spool is applied to the spool 2. The spool 2 is slidable when acting in the axial direction. That is, the outer peripheral seal portions of the lands 241 to 244 also have a function as setting means for determining the sliding start external force. These seal portions are usually formed integrally with the lands 241 to 244, but may be constituted by separate seal members. Between the first and second lands 241 and 242 is a blocking groove 245 that communicates with the outflow port 213 when the connection between the inflow port 212 and the outflow port 213 is disconnected. Further, a connecting groove 246 is provided between the second and third lands 242 and 243. The groove 246 communicates with the inflow port 212 at all times, and communicates with the outflow port 213 only when the inflow port 212 and the outflow port 213 are connected. Further, the distance between the third and fourth lands 243 and 244 is set larger than the distance between the connecting position and the blocking position of the spool 2.

  By the way, the front end surface of the base portion 219 is a tapered surface 247 slightly tapered toward the rear in the axial direction so that the communication passage 225 and the operation inflow portion 221 communicate with each other satisfactorily. The communication path 225, or the through hole 224 and the communication path 225 constitute a chemical solution supply stop unit. The chemical solution supply stop unit may include an operation inflow portion 221.

  In the above configuration example, at the time of injection, an injection needle that can be attached to the tip of a syringe, an indwelling needle already placed in a blood vessel, or an injection line extending from a catheter is attached to the injection line attachment portion 209, while the tip attachment portion A syringe tip filled with a chemical solution is attached to 208 as a chemical solution supply means. The spool 2 is in the connection position shown in FIGS. 29 and 31, and the inflow port 212 and the outflow port 213 are connected by the connection groove 36.

  Before injection, first, the plunger of the syringe is pressed, and the flow path to the patient, that is, the through-hole 224, the operation inflow portion 221, the inflow port 212, the connection groove 246, the outflow port 213, the first · After performing the so-called “priming” in which the gap 215 of the second member 204, the injection line mounting portion 209, and the injection line are filled with a chemical solution to remove the internal air, the injection needle of the injection line is inserted into the patient's blood vessel Puncture. The priming may be performed with physiological saline.

  Next, the plunger of the syringe is pressed. At this time, the blood vessel is secured, that is, the injection needle of the injection line is surely inserted into the blood vessel, the injection line is connected to the blood vessel, and the injection of the drug solution is performed. When the speed is the normal injection speed, the spool 2 is held at the connection position as described below, so that the drug solution flows into the blood vessel and normal injection can be performed.

  That is, when the pressure of the chemical solution acts from the communication path 225 into the operation inflow portion 221, the normal injection pressure equal to or lower than the set injection pressure of the chemical solution, that is, the syringe needle gauge or the syringe disconnection at the time of injection. Due to an increase in the normal pressure of the chemical solution due to the area, for example, an increase in the pressure of the chemical solution in the initial sliding of the plunger of the syringe, or an increase in the pressure of the chemical solution due to a normal injection speed of the chemical solution, etc. External force acting in the axial direction rearward acts. However, since the sliding start external force of the spool 2 is greater than this external force, there is no fear that the spool 2 will slide unexpectedly, and the normal injection can be performed as described above.

  However, if the blood vessel is not secured in the initial stage of injection, that is, if the injection needle of the injection line is not punctured and the injection line is not connected to the blood vessel, the set injection pressure of the drug solution The above large abnormal injection pressure acts on the front end surface of the spool 2 via the communication passage 225 and the operation inflow portion 221, and the external force acting on the spool 2 in the axial direction rearward is equal to or greater than the sliding start external force. .

  As a result, the spool 2 slides rearward in the axial direction, and the drug solution in the syringe continues to flow into the operation inflow portion 221 via the communication path 225. 30 and 33, the contact portion 229 contacts the lid 205, the outflow port 213 communicates with the blocking groove 245, the inflow port 212 and the outflow port. Connection of 213 is cut off, and the notification unit 220 protrudes rearward in the axial direction from the housing 1.

  As a result, the plunger of the syringe cannot be pressed, and the medical solution is not forcibly injected into a non-necessary portion, so that the patient does not feel significant pain. In other words, the patient can smoothly receive the necessary medical treatment and can prevent additional medical acts such as a medical treatment accompanying the leakage of the drug solution to the outside of the blood vessel. It is expected to be improved.

  Further, as described above, the plunger of the syringe can no longer be pressed, so that the practitioner can easily know from the hand side that the above-mentioned abnormality, that is, the blood vessel is not secured. Since 220 protrudes from the housing 1, the practitioner can easily see this, and this also allows the user to easily know that a blood vessel is not secured.

  At this time, if the plunger of the syringe is pulled, the chemical solution in the tip mounting portion 208 and the like can be returned to the syringe. Also in this aspect, the chemical solution can be prevented from being wasted and an increase in medical cost can be prevented. In addition, when the plunger of the syringe is pulled, the pressure of the chemical solution in the operation inflow portion 221 decreases and the spool 2 may return to the connection position. May be pressed forward in the axial direction to return the spool 2 to the connection position. At this time, if the operation is performed after a part of the injection line is closed with fingers or the like, the drug solution in the operation inflow portion 221 can be returned to the syringe again.

  After the above processing, the above series of operations is performed again from the beginning, and after confirming that blood vessels are secured, injection is performed as in the conventional case.

  In the present configuration example, as described above, when the blood vessel is not secured, the drug solution cannot be administered. Therefore, just before the drug solution is administered, the plunger of the syringe is pulled, so that blood flows backward to the injection line. There is no need to visually check “flashback” to see if blood vessels are secured.

  Therefore, “when the patient is inside the device for CT examination or MRI examination, and it is necessary to inject the drug solution into the blood vessel at high speed” or “the syringe for administering the drug solution is In the case of a prefilled syringe that is often unable to be withdrawn ", in the case of administering a chemical through a catheter inserted deep in the patient, or in the administration of a radiopharmaceutical In some cases, in order to prevent the operator from being exposed, various examinations and treatments can be performed without anxiety that the drug solution leaks out of the blood vessel even when the syringe and the injection line are also covered with a protective wall.

  Also, depending on the type of the chemical solution, there is a chemical solution with a maximum injection rate, but in contrast to this, the chemical solution is not injected at a rate faster than the normal injection rate as described below. . That is, when the injection speed of the chemical liquid becomes higher than the normal injection speed after the initial stage of injection, a large abnormal injection pressure higher than the preset injection pressure of the chemical liquid is caused to flow through the communication path 225 and the operation inflow portion 221 as described above. Accordingly, the external force acting on the front end surface of the spool 2 and acting on the spool 2 in the axial direction rearward is equal to or greater than the sliding start external force.

  As a result, the spool 2 is in the blocking position, and it becomes impossible to inject the chemical liquid, so that a large burden is not imposed on the patient, and the notification section 220 notifies the operator, so that the practitioner has the normal injection speed of the chemical liquid. You can easily know that it is faster than the speed. Therefore, the practitioner may return the spool 2 to the connection position, and then press the plunger of the syringe at a speed slower than before, and inject the chemical liquid using the injection speed of the chemical liquid as a normal injection speed.

  FIG. 34 shows a twelfth embodiment of the present invention, which is provided with a setting mechanism (means) 233 for setting the value of an external force necessary for sliding the spool 2, and is configured as follows.

  That is, a circumferential protrusion 234 having a larger diameter than the base portion of the base portion 219 is integrally formed at the tip end portion of the tip mounting portion 208 of the spool 2.

  An adjustment cylinder 235 that is externally fitted to the base portion 219 is externally fitted and fixed to the proximal end portion of the first member 203 of the housing 1. The adjustment cylinder 235 is integrally formed of an elastically deformable material, and a tapered screw portion 236 that is tapered upward is formed on the outer peripheral surface of the tip portion thereof. In addition, a circumferential protrusion 237 that is positioned rearward of the first member 203 in the axial direction and protrudes inward in the radial direction is integrally formed at an intermediate portion of the inner peripheral surface of the adjustment cylinder 235 in the axial direction. 237 is disposed behind the circumferential protrusion 234 of the spool 2 in the axial direction. Furthermore, a slit (not shown) formed in a radial direction is disposed in a portion extending from the base end of the adjustment cylinder 235 to the circumferential protrusion 234. As the constituent material of the adjusting cylinder 235, the same material as the spool 2 is used.

  The lid 205 is fitted on the adjustment cylinder 235, and the female screw part 238 on the inner periphery thereof is screwed into the taper screw part 236. The screw of the lid 205 with respect to the adjustment cylinder 235 makes the slit of the adjustment cylinder 235. Expands and contracts in the circumferential direction, and the inner diameter of the circumferential protrusion 237 expands and contracts. Even when the inner diameter of the circumferential protrusion 237 is the maximum diameter, the outer diameter of the circumferential protrusion 234 is made larger than this inner diameter. Further, the outer diameter of the abutting portion 229 of the base portion 219 is made larger than the inner diameter, and the circumferential protrusion 237 serves as a stopper for the abutting portion 229. The adjusting cylinder 235 may be formed with a normal screw portion instead of the taper screw portion 236 and the lid 205 may be formed with a taper screw portion.

  In the above configuration example, when the spool 2 moves from the connection position to the blocking position, the peripheral protrusion 237 of the adjustment cylinder 235 and / or the peripheral protrusion 234 of the spool 2 is elastically deformed, and the peripheral protrusion 234 of the spool 2 is It is necessary to pass through the inside of the circumferential protrusion 237 of the adjustment cylinder 235. Therefore, by expanding or reducing the inner diameter of the peripheral projection 237 of the adjustment cylinder 235, the external force necessary for the peripheral protrusion 234 of the spool 2 to pass through the inside of the peripheral protrusion 237 of the adjustment cylinder 235, that is, the sliding start external force can be freely set. Can be set.

  35 to 38 show a thirteenth embodiment of the present invention, in which the connection portion 214 of the second member 204 of the housing 1 is fitted over the entire first member 203. Further, the tip of the base part 219 is fitted into the base part of the sealing member 222 of the spool 2 through elastic deformation and integrated, and a through hole 224 is formed in the base part 219 and the sealing member 222.

  In the above embodiment, the return operation from the shut-off position of the spool to the connection position is performed by manual operation of the spool or pulling the plunger of the syringe. However, in order to perform the return automatically in a short time. In addition, various springs such as a coil spring and a compressed air spring that press the spool forward in the axial direction, or other return means may be provided.

  Moreover, as an example of the chemical solution administration set according to the present invention, for example, the chemical solution administration set includes a chemical solution filled syringe that is a chemical solution supply means and the chemical solution supply control device according to the present invention. In this case, (1) the case where the syringe and the chemical liquid supply control device are connected by screwing the luer lock adapter provided in the syringe and the flange of the tip mounting portion of the chemical liquid supply control device; and (2) the syringe An injection line is connected between the medical solution supply control device and the injection needle is connected to the injection line mounting portion of the chemical solution supply control device; and (3) an injection line between the chemical solution supply control device and the injection needle. May be connected. In addition, in the drug solution administration set, the drug solution supply means and the drug solution supply control device are further used to administer the drug solution into the catheter, injection needle, indwelling needle, three-way stopcock (three-way stopcock function), extension tube, and other living body blood vessels. Various medical instruments used in the above or combinations of their functions can also be included.

As described above, the chemical solution administration set using chemical liquid supply control device and a device that written to the present invention are useful as equipment and set you administering a drug solution to a patient.

Claims (36)

(A) a housing interposed between the drug solution supply means and the injection line;
(B) A spool that is slidable in the axial direction in the housing and connects the drug solution supply means and the injection line in an intermittent manner by sliding in the axial direction.
In the chemical liquid supply control device having
In the housing,
(A) a spool hole;
(B) an opposing portion that is opposed to one end surface in the axial direction of the spool and that is an inflow portion for operation between the end surface;
(C) Outflow port through which the chemical in the spool hole flows out to the injection line
Formed,
An inflow port through which chemical liquid from the chemical liquid supply means flows into the spool hole is formed in the housing or the spool,
In the spool hole, a spool that connects the inflow port and the outflow port in an intermittent manner is slidable in the axial direction,
When the pressure of the chemical liquid rises when the inflow port and the outflow port are connected, the chemical liquid supply means or the chemical liquid of the injection line is supplied to the inflow portion for operation, and the spool is slid by the pressure of this chemical liquid, A chemical solution supply control device provided with a chemical solution supply stopping unit that cuts off the connection between the inflow port and the outflow port and stops the supply of the chemical solution from the chemical solution supply unit to the injection line . The chemical solution supply control device according to claim 1, wherein an inflow port is formed in the housing. The spool has a pair of lands spaced apart in the axial direction;
Between both lands is a groove connecting the inflow port and the outflow port,
The chemical supply stop means
The chemical solution supply control device according to claim 2 , wherein the chemical solution supply control device is formed in a spool and is a flow path that communicates the groove and the inflow portion for operation. The chemical supply stop means
3. The chemical solution supply control device according to claim 2 , wherein the chemical solution supply control device is an inlet side operation port formed in the housing and communicating with the chemical solution supply means and the operation inflow portion. The chemical solution supply control device according to claim 4 , wherein the inflow port is also used as an inlet side operation port. The chemical supply stop means
The chemical solution supply control device according to claim 2 , wherein the medical solution supply control device is an outlet-side operation port formed in the housing and communicating with the injection line and the inflow portion for operation. The chemical supply control device according to claim 6 , wherein the outflow port is also used as an outlet-side operation port. The chemical solution supply control device according to any one of claims 2 to 7 , wherein at least a part of the facing portion is an auxiliary portion made of an elastic material. 9. The setting device according to any one of claims 2 to 8 , further comprising setting means that allows the spool to slide only when the pressure of the drug solution becomes equal to or higher than a set pressure, and disconnects the connection between the drug solution supply unit and the injection line. Chemical supply control device. 10. The chemical solution supply control device according to claim 9 , wherein the setting pressure of the setting means can be adjusted. In the housing,
(A) an inflow port;
(B) Actuation port through which the chemical solution in the injection line flows into the inflow section for operation
Formed,
A spool operating means;
Between the spool and the operating means,
Engaging means for releasing the above engagement when the operating force of the operating means exceeds the set operating force when the both are detachably engaged and the spool is operated away from the facing portion.
The chemical | medical solution supply control apparatus of Claim 2 with which was provided. The spool has a pair of lands that are spaced apart in the axial direction and are slidable in the axial direction in the spool hole;
The chemical solution supply control device according to claim 11, wherein a gap connecting the inflow port and the outflow port is formed between both lands. Spool
(A) a pair of small-diameter lands spaced apart in the axial direction and slidable in the axial direction in the spool hole;
(B) A large-diameter land that is disposed between both small-diameter lands and the other axial end surface of the spool and has a larger diameter than the small-diameter land and is slidable in the axial direction in the spool hole. The chemical | medical solution supply control apparatus of Claim 11 which has. The chemical solution supply control device according to claim 13, wherein both the small-diameter land and the large-diameter land are separated. On the spool
The chemical solution supply control device according to any one of claims 1 to 14 , further comprising a notifying unit that protrudes to the outside of the housing and notifies the interruption when the connection between the chemical solution supply means and the injection line is interrupted. The operation means is
(A) a lever pivotally supported by the housing;
(B) having a return spring for returning the swinging lever to its original position;
The engaging means is
(I) a circumferential groove formed in the spool;
(Ii) The chemical supply control device according to any one of claims 11 to 15 , further comprising an engaging portion that is formed on the insulator and detachably engages with the circumferential groove through elastic deformation. Reiko
The chemical solution supply control device according to claim 16 , wherein when the connection between the inflow port and the outflow port is interrupted, the informing unit notifies the disconnection. The housing is provided with a cylindrical injection line mounting portion surrounding the outflow port,
The chemical solution supply control device according to any one of claims 2 to 17, wherein a luer lock adapter connected to the injection line is provided in the injection line mounting portion. An outflow port is formed on the side of the housing;
Spool
(A) a communication path connected to the chemical solution supply means and communicating with the inflow portion for operation;
(B) An inflow port formed on the side of the spool and communicating with the communication path and the spool hole
A chemical liquid supply control device. Housing
(A) a first member having a substantially cylindrical shape, the inside being a spool hole, a tip portion being an opposing portion, and an inflow port being formed in the side wall portion in a radial direction;
(B) a second member having a substantially cylindrical shape that opens in both axial directions, and having a base-side connection portion and a distal-end-side injection line mounting portion connected to the injection line;
The connecting portion is externally fitted and fixed to the first member, the inflow port is included in the connecting portion, and the inflow port communicates with the injection line mounting portion via the gap between the first and second members. The chemical | medical solution supply control apparatus of Claim 19 to do . The chemical | medical solution supply control apparatus of Claim 19 or 20 with which the lure lock adapter connected with an injection line was provided in the injection line mounting part. Housing
The chemical solution supply control device according to claim 20 or 21, further comprising a lid body provided at a base end portion of the first member and configured to restrict sliding of the spool toward the rear side in the axial direction. On the outer periphery of the spool, the first to third lands are juxtaposed in the axial direction from the distal end toward the proximal end,
Between the first and second lands,
When disconnecting the connection between the inflow port and the outflow port, it is a blocking groove that communicates with the outflow port.
Between the second and third lands,
The chemical supply control device according to any one of claims 19 to 22 , wherein the chemical supply control device is a connection groove that is always in communication with the inflow port and that is in communication with the outflow port when the inflow port and the outflow port are connected. A fourth land is provided on the base side of the outer periphery of the spool with respect to the third land,
The chemical solution supply control device according to claim 23 , wherein the distance between the third and fourth lands is greater than the distance between the connecting position and the blocking position of the spool. A through hole is formed in the spool in the axial direction,
The base portion of the spool is a tip mounting portion on which the tip of the syringe is detachably mounted,
The chemical solution supply control device according to any one of claims 19 to 24 , wherein a tip end portion of the through hole is a communication path. The chemical solution supply control device according to any one of claims 19 to 25 , further comprising setting means for setting a value of an external force necessary for sliding the spool. 27. The chemical solution supply control device according to claim 26 , wherein the setting value of the setting means is adjustable. On the spool
28. The chemical solution supply control device according to any one of claims 19 to 27 , further comprising a notifying unit that projects rearward in the axial direction of the housing when the connection between the inflow port and the outflow port is interrupted to notify the disconnection. The chemical solution supply control device according to any one of claims 1 to 28 , wherein a three-way cock function is provided between the chemical solution supply means and the inflow port. 30. A medicinal solution administration set comprising the medicinal solution supply control device according to any one of claims 1 to 29 and a medicinal solution supply means. The medicinal solution administration set according to claim 30 , wherein the medicinal solution supply means is an injection syringe. 32. The drug solution administration set according to claim 31, wherein the syringe for injection is a syringe filled with a drug solution. 31. The drug solution administration set according to claim 30 , wherein the drug solution supply means is an infusion bag. 34. The medicinal solution administration set according to claim 33 , wherein the drip bag is a medicinal solution filled bag. The chemical solution administration set according to any one of claims 30 to 34 , wherein the chemical solution supplied by the chemical solution supply means is a contrast agent. 36. The drug solution administration set according to claim 35 , wherein the contrast agent is an MRI contrast agent.

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