JP2022069406A - Liquid introduction device - Google Patents

Abstract

To provide a liquid introduction device with a cap which can be attached and replaced by preventing a user from directly touching a liquid introduction tip of an injection needle or the like with a hand or the like.SOLUTION: In a liquid introduction device, irregular fitting stationary parts are formed in a stationary pipe 6 and a liquid storage body to make the stationary pipe irregularly fit to the liquid storage body, a guide screw part 7a is formed on the inner wall of a cap 7, a passive screw part 6b that is screwed to the guide screw part is formed on the outer side of the stationary pipe, and the cap and the stationary pipe move relatively front and back to be attachable and detachable by relatively rotating them.SELECTED DRAWING: Figure 1

Description

The present invention is a liquid introduction device for administering a drug solution to a patient, and can be attached or replaced without directly touching the liquid introduction tip of an injection needle or the like with a cap. Regarding the device.

Conventionally, as a liquid introduction device that can be attached or replaced without directly touching the liquid introduction tip of an injection needle or the like, Patent Document 1 describes a patient connector fitted and fixed with a rib in the packaging. Is disclosed to be removable by screwing it into a container.

Japanese Patent No. 6666386

The one disclosed in Patent Document 1 has a structure in which the patient connector fitted and fixed in the packaging is screwed to the container, so that it is difficult to know when the joining of the patient connector and the container is completed, and the joining is not sufficient. There is a risk that the introduction liquid may leak out or the screw may be tightened too strongly, leading to damage to the container or patient connector.

The present invention consists of at least a liquid containing main body for accommodating the introduced liquid, a fixed tube having a liquid outlet tip at the tip, and a cap of a bottomed cylinder capable of covering the liquid outlet tip, and is guided to the inner wall of the cap. A screw part is formed, a passive screw part that is screwed to the induction screw part is formed on the outer part of the fixed tube, and by rotating both relative to each other, the cap and the fixed tube can be relatively moved back and forth and attached / detached. In addition, a rotation suppression engaging part is formed on the inner or outer surface of the liquid containing body side from the passive screw part of the fixed pipe, and a guide engaging part is provided on the outer or inner surface of the liquid containing body opening facing this. By forming and engaging with each other, the relative rotation of the fixed pipe with respect to the liquid storage body is suppressed, the relative movement of the two in the longitudinal and anterior-posterior directions is allowed, and the screwing relationship between the cap and the fixed pipe is allowed. In the range, an uneven fitting fixing portion is formed between the inner surface of the fixed tube and the outer surface of the opening of the liquid containing body, or between the outer surface of the fixed tube and the inner surface of the opening of the liquid containing body, and the fixed tube is the liquid containing main body. The cap can be detached from the fixed tube by rotating the cap in the direction of moving to the side so that the fixed tube and the liquid storage body can be fitted unevenly, and then the cap is further rotated in the same direction after fitting the unevenness. Further, a contact portion is formed between the cap and the liquid storage body, and the cap and the fixed pipe are guided again by rotating the cap in the direction in which the cap and the fixed pipe are joined while the two are in contact with each other. The screw part and the passive screw part are screwed together to move the fixed tube away from the liquid storage body, release the uneven fitting relationship between the fixed tube and the liquid storage body, and store the fixed tube in the cap. The gist is a liquid introduction device that can be fixed.

When attaching the fixed pipe having the liquid outlet tip portion at the tip, which is housed in the cap in a screw relationship, to the liquid storage body, the cap and the fixed pipe in this coupled state are guided to the opening of the liquid storage body. At this time, the rotation restraining engaging portion of the fixed tube is guided and guided to the guide engaging portion of the opening of the liquid accommodating body to prevent the fixed tube from rotating relative to the liquid accommodating body, and the cap is rotated in this state. Then, the rotational force of the cap is transmitted from the induction screw part to the passive screw part of the fixed tube, the fixed tube moves toward the liquid storage body, and the fixed tube and the liquid storage body are unevenly fitted at a predetermined position. Is fixed. If the cap is further rotated, the cap will come off from the fixed pipe, so the time when the fixing between the fixed pipe and the liquid storage body is completed is clear, and damage to parts and liquid leakage due to excess or deficiency of fixing can be prevented as much as possible. Is. Also, by rotating the cap in the opposite direction to when it is attached to the fixed pipe, the fixed pipe is pulled through the induction screw part and the passive screw part, and when the fixing between the fixed pipe and the liquid storage body is released, the cap is again capped. With the fixed tube housed inside, it is possible to replace the liquid outlet tip with a new one without touching it.

Vertical sectional view showing an example of the liquid introduction device of the present invention. A-A'line cross-sectional arrow view of FIG. Vertical sectional view of the cam cylinder 302 Side view of slider 303 Perspective view of rotor 304 Enlarged view of part B in FIG. Vertical sectional view of the shaft cylinder 1 Perspective view of fixed pipe 6

The liquid introduction device of the present invention basically includes a liquid storage body for accommodating the introduced liquid, a fixed tube having a liquid outlet tip at the tip, and a cap of a bottomed cylinder capable of covering the liquid lead tip. It is composed of. In addition to the liquid storage body, the fixed pipe, and the cap, a connector for connecting to the device, a pressurizing mechanism capable of constant discharge of the introduced liquid, and the like may be provided.

As the introductory liquid, ink for writing tools and cosmetics, beauty essence for beauty, medical agents, and the like can be used.

The liquid storage body that stores the introductory liquid such as chemicals has a bottomed cylindrical shape, and the liquid can be taken in and out from the opening, but a cartridge can be inserted from the rear end or a liquid tank can be placed inside. It is also possible to have it separately.
Further, the liquid tank of a separate member may be arranged directly in the liquid storage body to directly store the introduction liquid in a free state, but a porous body such as a sponge impregnated with the introduction liquid or the convergence of fibers may be performed. It may be contained using the body.
As the relay means for conducting the liquid to the liquid lead-out tip, a communicating porous body or a fiber converging body can be used in addition to the one in which the space is only communicated.
Further, if necessary, a means for extruding or squeezing the liquid such as a pressurizing mechanism can be used.
As the material of the liquid containing body, it was made of injection-molded synthetic resin such as polyethylene, polypropylene, polyamide, polybutylene terephthalate, polyethylene terephthalate, polyacetal, fluororesin, glass, metal, etc. A combination of members can be used, but it must be selected in consideration of the reactivity with the introduction liquid and the permeability of the liquid or gas, and another material can be coated inside and outside the liquid storage body. .. If a transparent synthetic resin or glass is used, the amount of liquid contained can be made visible from the outside, and a plurality of parts can be combined and configured.

Further, the liquid storage body is provided with a fixing portion and an abutting portion for the cap, and an opening portion for attaching a fixing pipe to be described later.
The attachment part to the fixed tube has a guide engaging part that restricts rotation by engaging with the rotation suppressing engaging part of the fixed tube from the opening side to the bottom side, and unevenness to which the fixed tube is fixed. It has a fitting and fixing portion. The guide engaging portion and the rotation restraining engaging portion are arranged at positions facing each other, and if the fixed pipe is inserted into the opening of the liquid containing body, the guide is guided to the inner surface of the opening of the liquid containing body. The engagement part is inserted into the opening of the liquid storage body of the fixed tube. The rotation suppression engaging part is formed and arranged on the outer surface, and the fixed tube covers the opening of the liquid storage body (in other words, the fixed tube. If the opening of the liquid containing body is inserted into the inner hole), a guide engaging portion is formed on the outer surface of the opening of the liquid containing body, and a rotation suppressing engaging portion is formed on the inner surface of the fixed pipe.

The guide engaging portion is formed as a ridge extending in the longitudinal direction and arranged in a circumferential shape on the mounting portion, and the side surface of the ridge is formed in an inclined shape so that the rotation suppressing engaging portion is placed at an arbitrary position. Guide to the specified position between the ridges. The space between adjacent ridges formed as guide engagement parts is set so that the rotation suppression engagement part can move back and forth, and the rotation suppression engagement part abuts on the side wall of the ridge and is a fixed pipe. It is permissible to move the fixed tube back and forth while suppressing the rotation of the fixed tube.

The contact portion of the liquid storage body with respect to the cap may be a shoulder-shaped step portion when the opening is a small diameter portion, an abuttal wall may be formed at a predetermined position, or the like, and the opening end portion or protrusion of the cap may be formed. By abutting, the relative longitudinal position of the cap and the liquid storage body in the attached state is determined, and the attachment / detachment of the fixed tube and the liquid storage body is controlled by the back-and-forth movement of the fixed tube due to the rotation of the cap. Is. In particular, when the fixed tube is removed from the liquid storage body, it serves as a support for transmitting the rotational force of the cap to the fixed tube.

The uneven fitting fixing portion that fits and fixes the fixed tube and the liquid storage body is easy to detect the completion of the coupling by fitting the unevenness. The uneven fitting referred to here includes not only the one in which one convex and the other concave fit each other, but also the one in which the convexes get over each other to form a fitting relationship. Fitting fixing by uneven fitting is preferable because one side is a protrusion formed on the entire circumference and the other side is a circumferential partial protrusion, so that the stress required for fitting can be dispersed. In many cases, the protrusions formed on the outside are the protrusions on the entire circumference, and the protrusions formed on the inside that fit into the protrusions are the partial protrusions arranged in a circumferential shape. In this case, it is preferable that a reliable fixing relationship can be obtained while minimizing the force required for attachment / detachment, and that molding is easy. When liquid tightness is required for the uneven fitting fixing part, it is necessary that at least one of the all-circumferential protrusions makes a circumferential contact, but a part that makes a liquidtight contact is formed separately from the uneven fitting fixing part. You can also.

Before connecting the fixed tube to the liquid storage body, a disposable lid that covers the opening of the liquid storage body may be used in order to hold the liquid contained in the liquid storage body alone. can. Further, for the same purpose, the liquid storage body may be provided with a valve mechanism. Naturally, it is preferable to have a valve mechanism rather than using a lid to be discarded, and if a valve mechanism is provided, the liquid storage body can be handled more safely and easily. Become.
As a valve mechanism, a valve rod urged toward the opening of the liquid storage body by a repellent member such as a coil spring is arranged as a plug in the liquid storage body, and a valve seat is provided on the inner wall of the liquid storage body. A small inner diameter portion can be formed and elastically contacted in a circumferential shape, and the valve rod can be moved backward by the operation to form a state in which the opened liquid can be taken out.

Further, as a valve mechanism, a bearing cylinder having a small diameter inner step portion at one end is fixedly arranged in the opening of the liquid storage body, and is directed toward the liquid tank side by a coil spring supported by the small diameter step portion of the bearing cylinder. The urged valve rod is placed as a plug, and a small inner diameter portion that serves as a valve seat is formed on the inner wall of the liquid storage body to elastically contact it in a circumferential shape to compress the container or place a pump mechanism. By pressurizing the liquid in the liquid tank or the air in the space by such an operation, the valve bearing can be moved forward to open the cap and form a state in which the liquid can be drawn out.
Further, as the valve mechanism, a rubber elastic body having a slit that can be closed can be used, and the slit is released by being pressed and deformed directly or via another member by connecting and fixing the fixed pipe, and the pressing force is released. When it is done, it may be something that closes the slit.

As the repellent member for urging the valve rod, a metal coil spring is preferable in terms of repeated durability, and a stainless steel coil spring is preferable in terms of corrosion resistance. It is also possible to reduce the number of parts by forming the repellent member from an injection-molded synthetic resin and molding it integrally with the plug body and the liquid storage body.
As the valve seat, the inner wall of the shoulder portion having a small opening can be used, or another tubular member can be arranged in the opening. As a separate member, a component in which one end of a metal or synthetic resin pipe member is reduced in diameter by caulking can be used.

It is preferable that the contact area between the valve rod and the valve seat is small, such as line contact, because the pressure per unit area can be increased. It is preferable to form the contact portion of one or both of the valve rod and the valve seat as a convex curved surface having a small radius of curvature so that the portions other than the contact portion are largely separated from each other in the direction in which they are separated from each other and the contact area is reduced. Further, the contact portion between the two can be made highly liquid-tight by making it a mirror surface state. Further, one or both of the valve rod and the valve seat may be made of a synthetic resin or rubber that can be elastically deformed to improve the adhesion to each other.

Further, the valve rod as a plug body may be opened by being pushed by the fixed pipe directly or via another member and moving backward in a state where the fixed pipe is connected and fixed to the liquid storage body. .. When the fixed pipe separates from the liquid storage body, the valve rod receives the urging force of the elastic member and makes a circumferential contact with the valve seat again to close the liquid storage body, and this opening and closing are repeated. Is possible.

The fixed pipe is attached to the opening of the liquid containing body so that the introduced liquid in the liquid containing body can be discharged from the liquid outlet tip portion arranged at the tip through the inner hole. The fixed tube and the liquid outlet tip can be integrated even if they are separate members, but in order to use the liquid outlet tips of various types and diameters for general purposes, a separate member is attached. Is preferable. The attachment of both can be appropriately selected according to the application and the situation, such as fitting by unevenness, press fitting, screwing, and adhesion by an adhesive.
A wide variety of applicators can be connected to the liquid lead-out tip, for example, writing utensils such as fiber sintered bodies, powder sintered bodies, brushes, fountain pen nibs, calligraphy nibs, ballpoint pen tips, and injection needles. It may be an applicator for a medical tool such as a pipette nozzle.

The fixed pipe has a passive screw portion on the outer side with respect to the induction screw portion formed on the inner wall of the cap, and the relative rotation between the cap and the fixed pipe causes forward / backward movement (proximity and separation) due to a screw relationship. Will be done. The fixed pipe has a rotation restraining engaging portion that engages with the guide engaging portion of the liquid accommodating body, and in a state where rotation is prevented with respect to the liquid accommodating body, the rotational force of the induction screw portion of the cap is applied. The passive screw part receives and is converted into a back-and-forth force, and the fixed tube moves back and forth with respect to the liquid storage body, and within the range of the screw relationship between the cap and the fixed tube, the fixed tube and the liquid storage body The fixing tube and the liquid accommodating body are attached to and detached from each other by the uneven fitting fixing portion formed between them.

Polypropylene, polybutylene terephthalate, etc. are used as the material of the fixed tube in consideration of gas permeability and slidability between parts.

The cap can cover and protect the liquid outlet tip of the liquid introduction device, and can hold the fixed pipe before being attached to the liquid storage body and the liquid outlet tip attached to the fixed tube inside. It is a member that is gripped and operated when attaching or detaching the liquid outlet tip to the liquid storage body, and when forming a bonded state between the liquid lead tip and the liquid storage body and establishing it as a liquid delivery device. It makes it possible to avoid touching the lead-out tip directly with the hand.
An induction screw portion is formed on the inner wall of the cap, and the liquid outlet tip portion and the fixed pipe can be held by the screwing relationship with the passive screw portion formed on the outer wall of the fixed pipe. It may have the fixing means of. In the state of being fixed by such other fixing means, the relative rotation of the cap and the fixed tube can also be in a free-spinning relationship without forward / backward movement.
Further, the cap has a contact portion with respect to the liquid storage body, and when the cap is rotated in the direction in which the cap and the fixed tube are joined in a state where the fixed pipe is unevenly fitted with the liquid storage body, the cap is in contact with the cap. When the contact part is in contact with the liquid storage body, the cap is supported by the contact part to fix the longitudinal position of the cap and the liquid storage body, and the rotation of the induction screw part is passive in the fixed pipe. The screw part receives and moves the fixed tube, the uneven fitting between the fixed tube and the liquid storage body is released, and the fixed tube and the liquid outlet tip attached to it are housed in the cap and removed from the liquid storage body. Can be done.
Here, among the side surfaces of the rotation restraining engaging portion and / or the guiding engaging portion, at least each other when the fixed pipes move in a direction away from the liquid accommodating main body due to the screwing relationship between the induction screw portion and the passive screw portion. It is preferable to form a guide wall that is an abutting side surface and is inclined in a direction in which the width of the rotation restraining engaging portion and / or the guide engaging portion in the rotational direction becomes narrower from the middle part in the front-rear direction toward the end portion. Area where the fixed tube moves toward the cap side and the guide wall abuts on the other side surface while the side surfaces of the rotation suppression engaging part and the guide engaging part abut against each other when the fixed pipe is removed from the liquid storage body. When entering, the force received by the fixed pipe as the cap rotates is displaced from the rotational direction to the force in the longitudinal direction (in other words, the direction away from the liquid storage body and the direction closer to the cap), so that the fixed pipe Is easy to remove. The guide wall is a wall that is inclined from the anterior-posterior mid-belly to the liquid storage body side end of the side surface of the rotation restraining engaging portion, and / or is directed from the anteroposterior mid-valve to the fixed tube side end of the guide engaging portion side surface. Can be formed as an inclined wall.

Further, it is preferable to form a bottomward movement restricting portion in the cap to protect the liquid outlet tip portion. In particular, the present invention has a structure in which the fixed tube having the liquid lead-out tip at the tip and the cap move relatively in a screwing relationship. It is preferable to prevent the tip of the liquid outlet from coming into contact with the bottom or the periphery of the cap to cause damage, contaminating the inside of the cap with the liquid to be discharged, or inducing liquid leakage.
As a method of restricting the relative rotation of the bottom direction movement restricting part, as a method of restricting the relative rotation with each other, one or both of the induction screw part and the passive screw part related to the screw may be provided with a wall against which the other party abuts, or a cap. It is mentioned that the inner wall and / or the fixed pipe is provided with an abutting portion that regulates further rotation, and the peripheral step portion formed in the cap instead of restricting the rotation of the fixed pipe and the cap. It is also possible to provide an abutting portion that restricts the movement of the fixed pipe toward the bottom of the cap by abutting the fixed pipe or the shoulder portion of another member fixed to the fixed pipe on the inwardly protruding rib or the like.
The cap is basically in the form of a bottomed cylinder, but when a groove is formed in the outer wall in the longitudinal direction or a communication hole is formed by a cover covering the groove and accidentally swallowed. It is also possible to secure a ventilation path. In addition, in the case of forming a communicating groove, unevenness such as a ridge portion connected in a direction perpendicular to the rotation direction and a groove between them is formed on the surface, so that it is easy to grip when rotating the cap and the grip is effective. There is also an advantage that it is easy to hang. In order to make it easier to grip when rotating the cap, the cross-sectional peripheral shape of the cap may be a polygon such as a triangle or a quadrangle having a linear portion. In this case, the portion corresponding to the corner of the polygon may be curved, and the outer peripheral surface of the entire cap may have planes and curved surfaces alternately present.
As the material of the cap, various synthetic resins such as polypropylene, polybutylene terephthalate, polyethylene terephthalate, polyacetal, polyethylene, polyvinylidene chloride, and polytetrafluoroethylene are used in consideration of the permeability and reactivity of liquid and gas. can do.

An example will be described with reference to the attached drawings.
The one shown in FIG. 1 is a vertical cross-sectional view of a drug solution delivery device having a built-in drug solution to be administered to a patient, a mechanism for discharging the drug solution from the lead-out tip by an operation, and a cap covering the lead-out tip. be. It is assumed that a syringe is equipped with an injection needle as a lead-out tip and a fixed amount of drug solution is discharged by operation. In order to enlarge the details of the figure and make it easier to see, the middle part of the part that houses the drug solution is cut out with a wavy line and omitted.

A valve mechanism 2 is arranged at the opening on the liquid delivery destination side (lower side of the drawing) of the tubular shaft cylinder 1 as a liquid storage body that directly stores the chemical liquid W as a liquid to be discharged inside, and the chemical liquid is unnecessary. To prevent leakage, a pressurizing mechanism is placed in the opening on the opposite side (upper side of the drawing) to the liquid delivery destination side, and pressure is applied to the internal chemical liquid W by operation to discharge it from the liquid delivery destination side opening. It's like that.

In the valve mechanism 2, the valve rod 202 arranged in the valve cylinder 201 is urged forward by the coil spring 203 to the valve seat portion 201a which is a reduced diameter portion of the inner hole formed in the inner edge of the tip opening portion of the valve cylinder 201. Circumferential contact is possible. The valve rod 202 is in contact with the valve seat portion 201a in a circumferential shape, and a part thereof is projected from the tip opening portion of the valve cylinder 201, and the protruding portion receives a pressing force toward the rear. The valve rod 202 elastically recedes against the coil spring 203 to form a liquid outlet path. When the pressing force applied to the valve rod ball 202 is released, the valve rod ball 202 is pushed by the elastic restoring force of the coil spring 203, and is in contact with the valve seat portion 201a in a circumferential shape to block the passage of the liquid. The pressing force for moving the valve rod 202 backward is applied by connecting the fixed pipe 6 described later to the opening of the shaft cylinder 1, and the chemical solution is in a state where the fixed pipe 6 is connected to the shaft cylinder 1. W can communicate with the injection needle 5.

The pressurizing mechanism guides the built-in chemical solution or the like to the lead-out tip by operation or application of power. In this example, the knock crown 301, the cam cylinder 302, the slider 303, the rotor 304, and the bolt rod 305. , A knock pressurizing mechanism composed of a nut cylinder 306 and a piston plate 307.
As shown in FIG. 2, which is a cross-sectional view taken along the line AA of FIG. 1, a cam groove 302a is formed on the inner wall of the cam cylinder 302 fixed to the inner wall of the shaft cylinder 1 (FIG. 3) and slides. The slider 303 can move back and forth in the cam cylinder 302 along the cam groove while engaging with the protrusion 303a (FIG. 4) formed on the outer wall of the child 303 to prevent the slider 303 from rotating. A knock crown 301 that is pushed directly into the shaft cylinder 1 by a finger or a hand is projected from the rear end opening of the shaft cylinder 1, and the slider 303 is advanced by the operation. A cam tooth 303b formed at the tip of the slider 303 abuts on the rotating inclined wall 304a (FIG. 5) formed on the side wall of the rotor 304 to apply a rotational force to the rotor 304. As shown in FIG. 2, the rotor 304 has a non-circular cross section of the inner hole 304b, and the bolt rod 305 is arranged in a state of being fitted in the inner hole 304b of the non-circular cross section. That is, by pressing the knock crown 301, the slider 303 arranged in the cam cylinder 302 advances along the cam groove 302a, and the cam teeth 303b come into contact with the rotating inclined wall 304a to cause the rotor 304. Moves forward while rotating, and along with this, the bolt rod 305 also moves forward while rotating.
The bolt rod 305 has a male screw portion 305a extending in the longitudinal direction on the outer wall, and is screwed with a female screw portion 306b formed in the inner hole 306a of the nut cylinder 306, and the nut cylinder 306 is a cam cylinder. The bolt rod 305 is fixed to the tip of the nut so as not to rotate, and the bolt rod 305 advances relative to the nut cylinder 306 by rotating. A piston plate 307 is fixed to the tip of the bolt rod 305, and the piston plate 307 is in close sliding contact with the inner wall of the barrel 1 and advances with the advance of the bolt rod 305 to accommodate the liquid. The internal volume is reduced, and the contained chemical solution W receives pressure and is derived from the liquid lead-out tip.

A coil spring 4 is arranged on the nut cylinder 306 fixed to the tip of the cam cylinder 302 to urge the rotor 303 rearward, and the knock crown 301 uses this rear urging force via the slider 303. When the pressing operation of the knock crown 301 is released, the knock crown 301 elastically returns to the position before the operation. The forward movement position of the knock crown 301 is regulated by abutting the tip of the movement control wall 302b formed on the inner wall of the cam cylinder 302 fixedly arranged in the shaft cylinder 1, and the forward movement is fixed. The forward distance of the piston board 307 can be specified by a single knock operation, and the volume of reducing the internal volume of the liquid accommodating body is fixed so that the amount of liquid drawn out is constant.

A fixed tube 6 to which an injection needle 5 as a liquid outlet tip is fixed is attached to the tip of the liquid storage body. A lead-out hole 6c communicating with the inner hole of the fixed tube 6 is formed on the injection needle side end surface of the fixed tube 6 outward from the central portion of the end face, and the lead-out hole 6c of the fixed tube 6 and the inner hole of the injection needle 5 are formed. Is communicating. A circumferential convex portion 6a is formed on the rear outer surface of the fixed pipe 6, and the circumferential inward convex portion 1a formed on the inner surface of the opening of the shaft or the like 1 overcomes this to form a concave-convex fitting fixing portion. It is formed and the fixing tube 6 is fixed to the opening of the shaft or the like 1. A presser 6d protruding rearward from the center of the inner wall on the back side of the lead-out hole 6c of the fixed pipe 6 is formed. Pressing element 6d presses and moves the lead liquid W backward so that the lead liquid W can communicate with the injection needle.

On the outer surface of the fixed tube 6, a passive screw portion 6b is formed on the tip side (injection needle side) of the circumferential convex portion 6a that is unevenly fitted with the circumferential inward convex portion 1a of the barrel 1 described above. It has a screwing relationship with the induction screw portion 7a formed on the inner wall of the cap 7. Further, the cap 7 has a circumferential inward fitting convex portion 7b that fits into the fitting recess 1b formed on the outer surface of the shaft cylinder 1, and the cap 7 is removable from the shaft cylinder 1. The fitting position between the fitting recess 1b and the circumferential inner fitting convex portion 7b is within a range in which the passive screw portion 6b of the fixed tube 6 and the induction screw portion 7a of the cap 7 are in a screwing relationship. Yes, the cap 7 can rotate even in the state where the cap 7 and the shaft cylinder 1 are fitted together.
When the joint relationship between the circumferential inner fitting convex portion 7b of the cap 7 and the fitting concave portion 1b of the barrel 1 is to have liquidtightness, it is a portion that slides due to the rotation of the cap 7. It is desirable to consider the material and surface condition so as to suppress wear and scratches on the part. It is also conceivable to use an elastic material, to make a mirrored surface, or to apply a lubricant such as silicon.

As shown in FIG. 6, which is an enlarged view of part B in FIG. 1, the fixed tube 6 and the cap 7 are in a screwed relationship, and the fixed tube 6 to which the injection needle 5 is attached is held inside the cap 7. It is possible to do. The fixed tube 6 can change its position back and forth in the cap 7 by the relative rotation of the cap 7 and the fixed tube 6 by screwing, but the injection needle 5 attached to the fixed tube 6 A small diameter step portion 7c is formed in the inner hole of the cap 7 so that the needle portion 5a does not collide with the inner wall of the cap 7, and even if both are excessively rotated, the outside of the attachment portion 5b of the injection needle 5 to the fixed tube 6 The portion abuts on the small diameter step portion 7c to restrict further movement, and a gap is secured between the tip of the needle portion 5a and the bottom of the cap 7.

The fixed pipe 6 can be attached to the shaft cylinder 1 by covering the shaft cylinder 1 with the cap 7 and rotating the fixed pipe 6 while the fixed pipe 6 is held in the cap 7 in a screwing relationship. As shown in FIG. 7 for a cross-sectional view of the shaft cylinder and FIG. 8 for a perspective view of the fixed pipe, the ridges are formed on the inner wall of the tip opening of the shaft cylinder 1 as a combination of a plurality of ridges arranged in a circumferential shape. A guide engaging portion 101 having a rotation prevention engaging groove 101b as a gap space between adjacent ridges and an guided inclined wall 101a as a side wall of the fixed pipe 6 is formed, and a circumferential convex portion of the fixed pipe 6 is formed with respect to the guide engaging portion 101. On the outer surface of the rear end of the barrel 1 side from 6a, a rotation suppressing engaging portion 601 guided by the guiding engaging portion 101 is formed as a protruding rib extending in the longitudinal direction. The rotation restraining engaging portion 601 has an engaging relationship with the inclined wall 101a at the rearmost end portion, which facilitates guidance to the guiding engaging portion 101, and the rotation preventing engaging groove 101b, so that the fixed pipe 6 is substantially rotated. It has an engaging wall 101c to prevent the above.

When the rear end of the fixed tube 6 is inserted into the tip opening of the barrel 1 while the fixed tube 6 is held in the cap 7, the fixed tube 6 can rotate relative to the cap 7 along a screwing relationship. The rotation restraining engaging portion 601 of the fixed pipe 6 moves along the induction inclined wall 101a and is guided to the rotation prevention engaging groove 101b. When the cap 7 is rotated in this state, the induction screw portion 7a of the cap 7 is transmitted to the passive screw portion 6b of the fixed pipe 6 to move the fixed pipe 6 backward (shaft cylinder 1). As described above, the circumferential convex portion 6a of the fixed pipe 6 is fitted with the circumferential inward convex portion 1a formed on the inner surface of the opening of the shaft or the like 1. The fixing tube 6 is fixed to the opening of the shaft or the like 1. When the cap 7 is further rotated in this state, the fixed tube 6 is fixed to the barrel 1 and cannot be moved further backward, so that the cap 7 is relatively detached from the fixed tube 6. In this way, the fixing of the fixed pipe 6 and the shaft cylinder 1 is completed by the uneven fitting, and no extra operation such as forcibly pushing is performed. Therefore, there is a risk of liquid leakage due to insufficient fixing. There is no risk of damage due to excessive pressurization.

With the fixed tube 6 fixed to the barrel 1, the cap 7 is put on again, and the cap 1 is rotated in the direction opposite to the case where the above-mentioned fixing portion 6 is fixed to the barrel 1 to be fixed to the cap 7. The tube 6 is screwed, and the open end portion 7d of the cap 7 is brought into contact with the shoulder portion 1c, which is the connecting portion of the outer diameter between the small diameter portion having the opening and the main body portion. When the cap 7 is further rotated while the open end 7d of the cap 7 and the shoulder portion 1c of the barrel 1 are in contact with each other, the cap 7 is rotated with the position fixed with respect to the barrel 1. Further, in the fixed pipe 6, the rotational force of the cap 7 is applied from the induction screw portion 7a to the passive screw portion 6b in a state where the rotation suppression engaging portion 601 is engaged with the rotation prevention engagement groove 101b of the barrel 1. It is transmitted and moves in the direction in which the fixed pipe 6 is joined, and the circumferential convex portion 6a of the fixed pipe 6 gets over the circumferential inward convex portion 1a formed on the inner surface of the opening of the shaft or the like 1, and the fixed pipe 6 And the shaft cylinder 1 are released from fitting. At this time, when the fixed pipe 6 moves in the direction of joining to the cap 7, the fixed pipe side guide wall inclined from the front-rear direction mid-belly toward the end of the barrel 1 side of the side surface of the rotation suppressing engaging portion 601. The contact between the guide wall 101a as the guide wall on the barrel side causes the force received by the fixed pipe 6 to be displaced from the rotational direction to the front-rear direction, so that the fixed pipe 6 can be easily removed. Then, the fixed tube 6 is held by the cap 7 by screwing, and by pulling out the cap 7 from the shaft tube 1, the fixed tube 6 and the injection needle 5 at the tip thereof are housed in the cap 7. It can be detached from the cylinder 1. At the same time that the fixed pipe 6 is separated from the shaft cylinder 1, the valve mechanism 2 arranged at the opening of the shaft cylinder 1 operates, and the valve rod 202 circulates around the valve seat portion 201a due to the repulsive action of the coil spring 203. The inside of the shaft cylinder 1 is closed by contacting the shape.

1 Axle cylinder 1a Inward convex part 1b Fitting concave part 1c Shoulder part 101 Guide engagement part 101a Induction inclined wall (Axle cylinder side guide wall)
101b Anti-rotation engaging groove 101c Engagement wall 2 Valve mechanism 201 Valve cylinder 201a Valve seat part 202 Valve plug ball 203 Coil spring 3 Pressurizing mechanism 301 Knock crown 302 Cam cylinder 302a Cam groove 302b Movement control wall 303 Slider 303a Thread 303b Cam tooth 304 Rotator 304a Rotating inclined wall 304b Inner hole 305 Bolt rod 305a Male screw part 306 Nut cylinder 306a Inner hole 306b Female screw part 307 Piston board 4 Coil spring 5 Injection needle 5a Needle part 5b Mounting part 6 Fixed pipe 6a Convex part 6b Passive screw part 6c Derivation hole 6d Presser 601 Rotation suppression engagement part 602 Fixed pipe side guide wall 7 Cap 7a Induction screw part 7b Inward fitting convex part 7c Small diameter step part 7d Open end part W Introductory liquid

Claims (3)

It consists of at least a liquid storage body that stores the introduced liquid, a fixed pipe having a liquid outlet tip at the tip, and a cap of a bottomed cylinder that can cover the liquid outlet tip, and an induction screw portion on the inner wall of the cap. , A passive screw portion that is screwed to the induction screw portion is formed on the outer portion of the fixed pipe, and a rotation suppression engaging portion is formed on the inner surface or the outer surface of the liquid storage body side from the passive screw portion of the fixed pipe. At the same time, a guide engaging portion is formed on the outer surface or the inner surface of the liquid accommodating main body opening facing the liquid accommodating main body, and the relative rotation of the fixed pipe with respect to the liquid accommodating main body is suppressed by the engaging relationship between the two. Relative movement of both in the longitudinal and anterior-posterior directions is allowed, and the induction screw of the cap is rotated by rotating the cap while the rotation restraining engaging portion of the fixed pipe is engaged with the guide engaging portion. The fixed pipe can move back and forth relative to the liquid accommodating main body due to the screwing relationship between the portion and the passive screw portion of the fixed pipe, and the inner surface of the fixed pipe and the outer surface of the opening of the liquid accommodating main body. Alternatively, an uneven fitting fixing portion is formed between the outer surface of the fixed pipe and the inner surface of the opening of the liquid storage body so that both can be attached and detached. A liquid introduction device having a fixing complete contact portion that abuts on the liquid containing body when the fixing with the liquid containing body is completed. The liquid introduction device according to claim 1, wherein a bottom direction movement restricting portion for protecting the liquid lead-out tip portion is formed in the cap. When the fixed pipe moves in a direction away from the liquid accommodating main body due to the screwing relationship between the induction screw portion and the passive screw portion on the side surface of the rotation restraining engaging portion and / or the guide engaging portion. A claim that forms a guide wall that is at least in contact with each other and is inclined in a direction in which the width of the rotation restraining engaging portion and / or the guiding engaging portion in the rotational direction becomes narrower from the middle to the end in the anteroposterior direction. The liquid introduction device according to claim 1 or 2.

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