JP2011036490A - Syringe-cum-container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a syringe-cum-container, easily moving a safety device to a position for covering an injection needle, and surely preventing wrong operation of the safety device in the injection operation. <P>SOLUTION: The syringe-cum-container 1 includes the safety device 50 formed cylindrical and slidably mounted to the outer periphery of an outer cylinder 20, and adapted to cover the injection needle 37 when moved forward. The syringe-cum-container 1 is provided with a coil spring 70 for urging the safety device 50 from a first position toward a second position and a slide member 80 for releasing locking of a first holding means. When a plunger rod 90 is pushed in to perform the injection operation, the slide member 80 is disabled to slide, and at the completion of injection when the plunger rod 90 is completely pushed, the slide member 80 is enabled to slide. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a container-use syringe provided with a safety device used to cover an injection needle after completion of injection or the like to ensure safety.

  Since the container-use syringe is pre-filled with a chemical solution, it can be used immediately after being taken out of the package without complicated operations at a medical institution, so it is highly convenient and is used for medical operations such as doctors and nurses. It is very useful in reducing the work of the hospital, and is therefore adopted by many hospitals.

  By the way, when a person who has been engaged in medical work conventionally uses a syringe, the needle after the puncture may accidentally be pierced by itself, and there is a concern about virus infection caused by the puncture. Therefore, a syringe equipped with a safety device that covers the injection needle after injection with a cylindrical cover and prevents inadvertent contact of the injection needle for the purpose of safely processing the injection needle after being injected into a patient. It has been devised.

  For example, according to the syringe described in Patent Document 1, the locked state is released by applying pressure to the flexible safety device locked to the outer periphery of the cylinder and bending it, and the safety device is sandwiched. By directing the injection needle upward, the syringe body moves downward due to its own weight, and the injection needle is covered with the safety device.

JP 2001-29334 A

  However, in the syringe provided with the above-described conventional safety device, the means for moving the safety device to the position covering the injection needle is only the weight of the syringe body, and thus the force for relatively moving the safety device is weak. The injection needle may be caught on the syringe body in the middle of covering the injection needle with the safety device, and there is a problem that the injection needle cannot be reliably covered and safety cannot be maintained.

  Although it is conceivable to move the safety device manually, in this case, it is necessary to move the safety device with the other hand while holding the syringe for both containers with one hand. There is a problem that the operation is complicated and the operation becomes complicated.

  In addition, in the syringe equipped with the above-described conventional safety device, the safety device is simply attached by friction with the engaging portion, so that the safety device is not firmly fixed and is not stable. In some cases, the safety device is detached from the syringe, and the needle is accidentally stuck in the hand or finger of a person engaged in medical work.

  Furthermore, it is desirable to securely hold the safety device at a predetermined position so that the safety device does not malfunction during an injection operation for injecting the patient. On the other hand, in a state where the safety device covers the injection needle, it is desired that the position of the safety device can be reliably maintained so that the injection needle is not exposed.

  This invention has been made in view of the above problems, and can easily move the safety device to the position where the injection needle is covered, and reliably prevent malfunction of the safety device during the injection operation, The object is to provide a container-use syringe that can ensure safety.

In order to solve the above problems, the present invention proposes the following means.
That is, the container combined syringe according to the present invention has a cylinder tip attached to the front end side of the outer cylinder which is formed in a cylindrical shape along the axis and is filled with a drug solution, and a rear end side of the outer cylinder. A container-use syringe comprising: a container-use syringe body into which a plunger rod is inserted; and a safety device that is slidably mounted on the outer periphery of the outer cylinder and covers the injection needle when moved forward. A coil spring provided in a compressed state between a front end of the device and the tube tip, and biasing the safety device forward; and first holding means for locking the safety device against the bias of the coil spring The safety device is slidably moved along the radial direction of the outer cylinder, and the locking of the safety device by the first holding means is released by the sliding movement. An unlocking member, a large-diameter hole that penetrates the unlocking member, and a small-diameter hole that penetrates the unlocking member so as to be continuous with the large-diameter hole along the sliding movement direction, A large-diameter rod portion that is inserted into the plunger rod through the large-diameter hole and cannot be inserted into the small-diameter hole, and continues to the rear side of the large-diameter rod portion, and the large-diameter hole and the small-diameter hole A small-diameter rod portion that can be inserted into the large-diameter hole, and during the injection operation to push the plunger rod forward, the large-diameter rod portion is inserted into the large-diameter hole and pushes the plunger rod forward. The small-diameter rod portion is inserted into the large-diameter hole when the injection is completed.

  In the syringe with a container having such a feature, the latching member is released in the radial direction to release the locking of the safety device to the outer cylinder outer periphery by the holding means. Accordingly, the safety device moves forward by the biasing force of the coil spring and covers the injection needle. That is, since the safety device moves forward only by sliding the holding means, the injection needle can be easily and reliably covered with the safety device.

In addition, during the injection operation in which the large-diameter rod of the plunger rod is inserted into the large-diameter hole, the sliding movement is hindered by the presence of the large-diameter rod even if the locking release member is slid.
On the other hand, when the injection is completed when the small-diameter rod of the plunger rod is inserted into the large-diameter hole, the small-diameter rod enters the small-diameter hole from the large-diameter hole by sliding the locking release member. Will be inserted. Therefore, the sliding movement of the locking release member is not hindered.
That is, since the unlocking member can be slid only after the injection is completed, the safety device does not malfunction during the injection operation.

  Further, since the coil spring is provided between the front end portion of the safety device and the tube tip, even when the safety device is moved forward by the coil spring, the coil spring is housed inside the safety device, and the coil spring Will not be exposed to the outside. Therefore, when a container-use syringe with the injection needle covered with a safety device is dropped, the coil spring will not be directly impacted, so the coil spring will not break, and after the safety device is activated The state of covering the injection needle can be reliably maintained.

  The container-use syringe according to the present invention is provided with a spring receiving member that can be attached to the front end of the safety device, and in a state where the safety device is attached to the outer periphery of the cylinder, the coil spring is connected to the spring receiving member. It is provided in a compressed state between the tube tips.

  According to the container / syringe having such a feature, the coil spring can be retrofitted separately from when the safety device is mounted. In other words, since the spring receiving member is separated from the safety device and can be attached to the safety device, it is possible to attach a coil spring separately to the existing container / syringe equipped with the safety device. Become.

  The container-use syringe according to the present invention is provided with second holding means for holding the safety device at a position where the injection needle is covered, and the second holding means is formed by expanding a part of the tube tip. The end surface facing the front side is a front engagement surface, and the end surface facing the rear side is a rear engagement surface, and is protruded from the inner peripheral surface of the safety device, A return prevention stopper that engages with the front engagement surface at a position where the safety device covers the entire area of the injection needle and prevents the safety device from moving backward, and the return prevention on the inner peripheral surface of the safety device Projecting rearward of the stopper, the safety device engages with the rear engagement surface at a position covering the entire area of the injection needle, and the safety device is moved forward. Characterized in that it comprises a detachment prevention stopper for stopping.

  According to the container-combined syringe having such a feature, when the safety device moves to the tip and covers the injection needle, the return prevention stopper engages with the front engagement surface of the device engagement portion, thereby ensuring safety. The device is prevented from moving rearward, and the anti-disengagement stopper is engaged with the rear engaging surface of the device engaging portion to prevent the safety device from moving forward. That is, since the movement of the safety device in the axial direction is fixed, it is possible to prevent the safety device from being removed from the container / syringe or moving backward to expose the injection needle.

  In the container / syringe according to the present invention, the stopper for preventing detachment is formed so as to incline radially inward of the syringe / body main body as it goes forward, and the stopper for returning is used as the container / syringe. It is elastically deformable in the radial direction of the main body, a pressing ring is slidably provided on the outer peripheral surface of the safety device, and the return preventing stopper is moved by sliding the pressing ring to the position of the returning preventing stopper. You may make it protrude from the internal peripheral surface of the said safety device by pressing toward the radial inside of the said container-use syringe main body.

According to the container combined use syringe having such a feature, when the safety device is mounted on the outer periphery of the outer cylinder from the front, the inclined surface of the stopper for preventing the detachment comes into contact with the front engagement surface, so that the inner periphery of the safety device can be easily made. By allowing the stopper to come off, the disengagement prevention stopper can quickly get over the engaging portion.
In addition, the return prevention stopper that does not normally protrude to the inside of the safety device is configured to protrude inward only when pressed from the radially outer side by the pressing ring. Therefore, when the safety device is mounted on the outer periphery of the outer cylinder from the front, by keeping the return prevention stopper not protruding inward, it is possible to avoid the return prevention stopper from coming into contact with the engaging portion. The movement is not prevented and can be easily mounted.

  In the container / syringe according to the present invention, the return prevention stopper is formed so as to incline radially inward of the container / syringe main body toward the rear side, and the detachment prevention stopper is provided on the front side. The height of the return prevention stopper from the inner peripheral surface of the safety device is such that the return prevention stopper is inclined toward the inside in the radial direction of the container-use syringe body. It may be formed lower than the height from the inner peripheral surface.

According to the container and syringe having such a feature, the safety device can be easily attached to the outer periphery of the outer cylinder, and the safety device can be reliably fixed at the position where the injection needle is covered.
That is, when the safety device is mounted from the front side of the outer cylinder, the inclination of the detachment prevention stopper comes into contact with the front engagement surface of the device engagement portion, and the inner peripheral surface of the detachment prevention stopper is bent to engage the device. The diameter is expanded to an inner diameter through which the part can pass. As a result, the device engaging portion passes over the disengagement prevention stopper and passes.
Further, the deflection of the inner peripheral surface of the anti-removal stopper also affects the inner peripheral surface of the return preventing stopper, and the inner peripheral surface of the return preventing stopper is also enlarged. At this time, since the return prevention stopper is located at a position separated from the detachment prevention stopper, the diameter expansion amount of the inner peripheral surface of the return prevention stopper is smaller than the diameter expansion amount of the inner peripheral surface around the detachment prevention stopper. Here, since the height of the return prevention stopper is formed lower than the height of the detachment prevention stopper, even if the diameter expansion amount of the detachment prevention stopper is smaller than the diameter expansion amount of the return prevention stopper, the device engagement portion is You can pass over the anti-return stopper.
Therefore, by increasing the diameter of the detachment prevention stopper so that the device engagement portion can pass, the return prevention stopper is also expanded to the diameter that the device engagement portion can pass at the same time, so that the detachment prevention stopper and the return prevention stopper Therefore, the safety device can be easily mounted on the outer periphery of the outer cylinder without hindering the mounting of the safety device.

When the safety device is moved forward to cover the injection needle, first, the inclination of the return prevention stopper comes into contact with the rear engagement surface of the device engagement portion, and the inner peripheral surface of the return prevention stopper is bent. The diameter is expanded to an inner diameter through which the engaging portion can pass. Thereby, the device engaging portion passes over the return prevention stopper and passes.
Further, the deflection of the inner peripheral surface of the return preventing stopper also affects the inner peripheral surface of the return preventing stopper, and the inner peripheral surface of the return preventing stopper is also enlarged. At this time, since the detachment prevention stopper is located at a position separated from the return prevention stopper, the diameter expansion amount of the inner peripheral surface of the detachment prevention stopper is smaller than the diameter expansion amount of the inner peripheral surface around the return prevention stopper. However, since the height of the detachment prevention stopper is formed higher than the height of the return prevention stopper, in order for the device engaging portion to pass through the detachment prevention stopper, the diameter expansion amount of the detachment prevention stopper is the return prevention stopper. It must be larger than the diameter expansion. Therefore, since the inner diameter of the stopper for preventing detachment does not increase to a diameter that allows the device engaging portion to pass through, the stopper for preventing detachment engages with the rear engaging surface of the device engaging portion and moves backward to the safety device. Movement is prevented. Moreover, after the device engaging portion passes over the return prevention stopper, the return prevention stopper is restored, and the safety device is prevented from moving forward. As a result, the safety device can be reliably fixed in a state where the injection needle is covered while the safety device is easily moved forward.

According to the container / use syringe of the present invention, the safety device can be reliably moved to the position covering the injection needle only by operating the locking release member, so that the safety device can be easily and reliably moved to the position covering the injection needle. It is possible to ensure safety by moving to.
Further, since the unlocking member can be slid only when the injection is completed, it is possible to reliably prevent the malfunction of the safety device during the injection operation and to ensure safety.

It is the side view which made a part of the container combined use syringe concerning a 1st embodiment into the section. It is the side view which made a part of the container combined use syringe body concerning a 1st embodiment into a section. It is a sectional side view of a finger grip. It is an A direction arrow directional view of FIG. It is a B direction arrow line view of FIG. It is a side view of the safety device of a 1st embodiment which made the return prevention stopper project. It is a side view of the safety device of a 1st embodiment which made a return prevention stopper retreat. It is a sectional side view of a slide member. It is an A direction arrow directional view of FIG. It is a B direction arrow directional view of FIG. It is a figure of the state in which the slide member is located in a standby position in the state where the slide member was attached to the finger grip. It is a figure of a state where a slide member is located in a release position in the state where a slide member was attached to a finger grip. It is sectional drawing of the large diameter rod part of a plunger rod. It is sectional drawing of the small diameter rod part of a plunger rod. It is the figure which looked at the syringe used as a container from the back side before injection or at the time of injection operation. It is the figure which looked at the container combined use syringe from the back side at the time of completion of injection. It is the figure which looked at the syringe serving as a container from the rear side when the slide member is moved from the standby position to the release position. It is the side view which made a section the section of the container combined use syringe concerning a 1st embodiment in the state where the safety device covered the injection needle. It is a side view of the safety device of a 2nd embodiment. It is the figure which looked at the safety device of 2nd Embodiment from the back side. In the container combined use syringe of 2nd Embodiment, it is a figure explaining the effect | action of the return prevention stopper at the time of mounting | wearing a syringe main body with a safety device, and a removal prevention stopper. It is a figure explaining the effect | action of the return prevention stopper and removal prevention stopper at the time of moving a safety device from a 1st position to a 2nd position in the syringe with a container of 2nd Embodiment.

Hereinafter, a first embodiment of a container-use syringe according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the container / use syringe 1 in the first embodiment is configured by mounting a safety device 50 on a container / use syringe body 10 extending along an axis O.

The container / syringe 1 includes a first holding means for detachably locking the safety device 50 at a first position disengaged from the injection needle, and a second covering the safety device 50 for the injection needle 37 of the container / syringe body 10. Second holding means for locking in position, coil spring 70 for urging the safety device 50 from the first position toward the second position, and a slide member for releasing the locking by the first holding means (lock release member) 80).
In the following, the radial direction of the container-use syringe body 10 is simply referred to as the radial direction, the front end side is referred to as the front side, and the rear end side is referred to as the rear side.

  As shown in FIG. 2, the container-use syringe body 10 is attached to an outer cylinder 20 and a front end side (left side in FIG. 2) of the outer cylinder 20, and a hub luer lock (cylinder tip) having an injection needle 37 attached to the tip. ) 30 and a finger grip 40 attached to the rear end side (the right side in FIG. 2) of the outer cylinder 20.

The outer cylinder 20 is made of a transparent member such as glass or synthetic resin, and has a cylindrical shape extending along the axis O. A bypass path 20 a that bulges outward in the radial direction over a predetermined length in the axis O direction is formed in an intermediate portion in the axis O direction of the outer cylinder 20.
A front stopper 20b is liquid-tightly provided on the front side of the bypass passage 20a in the outer cylinder 20 and an intermediate stopper 20c and a rear stopper 20d are spaced apart in the direction of the axis O on the rear side. It is liquid-tight. A medicine and a chemical solution are sealed between the front stopper 20b and the intermediate stopper 20c and between the intermediate stopper 20c and the rear stopper 20d, respectively.

  The hub luer lock 30 has a multi-stage cylindrical shape centered on an axis O made of a transparent synthetic resin having appropriate rigidity, and has a cylindrical shape and a device engaging portion 31 positioned on the proximal end side. A cylindrical portion 32 coupled to the distal end side of the device engaging portion 31 so as to reduce the diameter of the device engaging portion 31; a smaller diameter than the cylindrical portion 32 coupled to the distal end side of the cylindrical portion 32; A luer tip 33 extending toward the distal end side along O, and a luer lock that is coupled to the distal end side of the cylindrical portion 32 with a space on the radially outer side of the luer tip 33 and has a cylindrical shape centered on the axis O Part 34.

  A fitting hole 35 is formed on the inner side of the device engaging portion 31 so as to open to the rear side, and the outer periphery of the front end of the outer cylinder 20 is fitted therein, whereby the hub luer lock 30 is firmly attached to the front end of the outer cylinder 20. It is designed to be integrated. Further, the end surface facing the front side of the device engaging portion 31, that is, the stepped portion between the device engaging portion 31 and the cylindrical portion 32 is a front engaging surface 31a, and the end surface facing the rear side is a rear engaging surface. 31b. The front engaging surface 31a and the rear engaging surface 31b are orthogonal to the outer peripheral surface having a cylindrical surface shape around the axis O in the device engaging portion 31, respectively.

  A bypass chamber 36 having a bottomed hole shape is formed on the front side of the fitting hole 35 of the device engaging portion 31, that is, on the inner side of the cylindrical portion 32. The bypass chamber 36 has a bottomed hole whose inner diameter is one step smaller than that of the fitting hole 35, and a plurality of bypass grooves 36 a extending in parallel with the axis O are equidistant in the circumferential direction on the inner peripheral wall thereof. Is formed. Each of these bypass grooves 36 a extends to the center of the bottom 36 b of the bypass chamber 36. The rear end of the bypass groove 36 a is connected to the boundary between the bypass chamber 36 and the fitting hole 35 by an annular groove 36 c formed around the axis O.

The luer tip 33 is a tapered outer peripheral surface 33a whose outer peripheral surface is reduced in diameter toward the front side. Further, the luer tip 33 is bypassed by passing through the luer tip 33 along the axis O in the front-rear direction. A communication hole 33 b that communicates with the center of the bottom 36 b of the chamber 36 is formed.
Further, a lock screw 34 a for locking the needle base of the injection needle 37 is formed on the inner peripheral surface of the luer lock portion 34.

  The injection needle 37 includes an injection needle main body 38 that extends toward the front side along the axis O, and a needle base 39 that is located on the proximal end side of the injection needle main body 38. The needle base 39 includes a tapered hole 39a that gradually decreases in diameter around the axis O toward the front side at the rear end portion, and further includes a screw projection 39b that protrudes toward the outer peripheral side of the rear end portion. Yes. The tapered hole 39a of the needle base 39 is fitted to the tapered outer peripheral surface 33a of the luer tip 33, and the screwing projection 39b is screwed to the lock screw 34a of the luer lock portion 34, whereby the injection needle 37 is moved to the front end of the hub luer lock. It is firmly fixed and integrated.

The finger grip 40 includes a fitting portion 41 having a cylindrical shape, and a flange portion 45 projecting radially outward from the rear end portion of the fitting portion 41.
As shown in FIG. 3, the fitting portion 41 has an inner peripheral side that is a fitting hole 42 into which the rear end portion of the outer cylinder 20 is fitted. An insertion hole 43 that opens toward the opening and has a smaller diameter than the fitting portion is formed.
A pair of protrusions projecting in a substantially cylindrical shape radially outward at the same position in the axis O direction at intervals of 180 ° in the circumferential direction on the rear end outer peripheral portion of the fitting portion 41. Locking convex portions 44, 44 are formed.

  As shown in FIG. 4, the flange 45 has a straight line k <b> 2 orthogonal to the straight line k <b> 1 and the axis O while the direction along the straight line k <b> 1 passing through the locking projections 44, 44 is a short direction in the rear view. The direction along the direction is a substantially rectangular shape with the longitudinal direction. The surface facing the rear side of the flange portion 45 is a flat flange surface 46, and the insertion hole 43 is formed in a circular shape at the center of the flange surface 46.

On the flange surface 46 on one side of the flange portion 45 with the straight line k1 as a boundary (the upper side with the straight line k1 in FIG. 4 as a boundary), a pair of first guides are spaced apart from each other by a predetermined distance around the straight line k2. Portions 47 and 47 are provided. The first guide portions 47, 47 are vertically provided from the flange surface 46 toward the rear side and extend in parallel with the straight line k2, and the side guides 47a, 47a The upper guides 47b and 47b extend in the direction close to the straight line k1 in the upper edge, that is, in the direction close to the locking projections 44 and 44 in the rear view, that is, in the direction toward the straight line k2. .
Further, a locking recess 46a that is recessed in a spherical shape is formed on the straight line k2 of the flange surface 46 on one side and on the opposite side of the straight line k1, that is, on the outer side in the radial direction.

Further, on the flange surface 46 on the other side of the flange portion 45 with the straight line k1 as a boundary (lower side with the straight line k1 in FIG. 3 and FIG. 4 as a boundary), a position spaced apart by a predetermined interval around the straight line k2. A pair of second guide portions 48, 48 are provided on the top.
As shown in FIGS. 3 to 5, the second guide portions 48, 48 are provided with side guides 48 a, 48 a that are erected vertically from the flange surface 46 and extend in parallel with the straight line k 2, The guides 48a and 48a have substantially L-shapes composed of upper guides 48b and 48b extending from the upper edges of the guides 48a and 48a in directions close to each other, that is, in a direction toward the straight line k2. Note that the distance between the pair of second guide portions 48 and 48 is one step smaller than the distance between the pair of first guide portions 47 and 47.

  A safety device 50 is attached to the outer periphery of the container / syringe body 10 composed of such members. As shown in FIGS. 1, 6, and 7, the safety device 50 includes a safety device main body 51, a pressing ring 60, and a spring receiving member 61.

  The safety device main body 51 is thinly molded as long as the strength can be maintained by a transparent and moderately flexible material such as polypropylene, and has a substantially cylindrical shape centering on the axis O as shown in FIGS. There is no. Note that the inner diameter of the safety device body 51 is formed substantially the same as the outer diameter of the outer peripheral surface of the device engaging portion 31.

  On the inner peripheral surface of the safety device main body 51, a plurality of disengagement prevention stoppers 53 having an inclined surface 53a that protrudes inward in the radial direction and inclines inward in the radial direction toward the front side are provided at equal intervals in the circumferential direction. Is formed.

  Further, on the front side of the detachment prevention stopper 53, a return prevention stopper 54 protruding radially inward from the inner peripheral surface by being pressed radially inward by the pressing ring 60 is spaced at equal intervals in the circumferential direction. A plurality are provided. In the present embodiment, the detachment prevention stopper 53 and the return prevention stopper 54 are arranged in a state where the circumferential positions thereof coincide with each other, but may be arranged so that the circumferential positions thereof are different from each other.

  As shown in FIG. 7, the return prevention stopper 54 is formed with a U-shaped slit 55 so as to surround the three directions of the rear side and the circumferential side when not pressed by the pressing ring 60. Thus, it is configured to be bent in a leaf spring shape along the radial direction. In the non-pressed state, the surface facing the outer peripheral side of the return prevention stopper 54 is a pressed surface 54a that gradually inclines radially outward as it goes rearward. When the pressed surface 54a is pressed radially inward by the pressing ring 60, the surface facing the inner peripheral side of the return preventing stopper 54 is an inclined surface 54b that is inclined radially inward toward the rear side. .

  The detachment prevention stopper 53 and the return prevention stopper 54 constitute second holding means for locking the safety device 50 at the second position where the safety device 50 moves forward and covers the injection needle 37. .

In addition, on the front side of the return prevention stopper 54 and the rear side through the U-shaped slit 55,
A pair of ring secondary stop protrusions 56a and 56b are provided so as to sandwich the return prevention stopper 54 from both sides in the axis O direction.
Of the pair of ring secondary stop protrusions 56a and 56b, the ring secondary stop protrusion 56a located on the front side is inclined so as to gradually expand outward in the radial direction toward the rear side. The positioned ring secondary stop protrusion 56b is inclined so as to gradually increase in diameter toward the front side.
In addition, a plurality of ring primary stop protrusions 57 protruding outward in the radial direction are formed on the further front side of the ring secondary stop protrusion 56a on the front side at regular intervals in the circumferential direction.

  Further, an engagement edge portion 59 is formed on the outer periphery of the front end of the safety device body 51 so as to protrude radially outward in an annular shape.

  As shown in FIGS. 6 and 7, the pressing ring 60 attached to the safety device body 51 has a cylindrical shape whose length in the direction of the axis O is sufficiently shorter than the safety device body 51, for example, polypropylene. It is thinly molded in a range in which strength can be maintained by a transparent and appropriate flexible material. Further, the inner diameter of the pressing ring 60 is formed to be substantially the same as the outer diameter of the outer peripheral surface of the safety device main body 51, so that the outer peripheral surface of the safety device main body 51 can slide along the axis O direction. It can be done.

  Such a pressing ring 60 is located immediately behind the ring primary stop protrusion 57 in the non-pressed state of the return prevention stopper 54, as shown in FIG. It is fixed so as not to move forward. Further, in this state, the rear end of the pressing ring 60 is in contact with the inclination of the ring secondary stop protrusion 56a on the front side, thereby preventing the pressing ring 60 from inadvertently moving to the rear side. It has been stopped.

In order to place the return prevention stopper 54 in the pressed state by the pressing ring 60, the pressing ring 60 is moved relative to the safety device main body 51 rearward. At this time, when the relative moving force is large to some extent, the inner peripheral surface of the pressing ring 60 can move rearward so as to ride up the inclination of the front ring secondary stop protrusion 56a.
Then, the pressing ring 60 that has passed over the secondary ring stop protrusion 56a in this way presses the pressed surface of the return preventing stopper 54 with its inner peripheral surface, thereby preventing the return as shown in FIG. The stopper 54 protrudes radially inward. At this time, the front side and the rear side of the pressing ring 60 are in contact with the ring secondary stop protrusions 56a and 56b, and the movement of the pressing ring 60 in the direction of the axis O is fixed.

  And in the safety device main body 51 in such a safety device 50, the engagement plate (engagement part) 58 extended in a rectangular plate shape parallel to the axis O toward the back from the rear end of the outer peripheral surface is mutually connected. A pair is formed at 180 ° intervals in the circumferential direction so as to face each other in parallel. The engagement plate 58 is elastically deformable in the radial direction with a connection portion 58a with the outer peripheral surface of the safety device main body 51 as a fulcrum, and is formed in a circular shape penetrating in the thickness direction (radial direction). An engagement hole 58b is provided. The inner diameter of the engagement hole 58b is substantially the same as the outer diameter of the locking projection 44 formed on the fitting part 41 of the finger grip 40 in the container-use syringe body 10, and the engagement hole 58b has an inner diameter. The engagement projection 44 engages the engagement plate 58 by fitting the engagement projection 44. In order to release the engagement between the engagement plate 58 and the engagement projection 44, the engagement projection 58 is elastically deformed radially outward with the connection portion 58a as a fulcrum, so that the engagement projection 44 is engaged with the engagement hole 58b. You just have to be out of the range.

As shown in FIGS. 1, 6 and 7, the spring receiving member 61 has a disk shape having an opening 61a for inserting the above-described injection needle 37 and the luer lock portion 34 in the center thereof, and its outer periphery. And an engaging claw portion 61b formed to protrude radially inward while the edge portion located at the end extends along the axis O toward the rear end side. The engaging claw portion 61 b can be engaged with the engaging edge portion 59, whereby the spring receiving member 61 is attached to the safety device main body 51.
Further, a spring support portion 61c extending along the axis O in parallel with the engagement claw portion 61b is formed at a position radially inward of the engagement claw portion 61b, and is more radial than the spring support portion 61c. The surface facing the inner rear end is a spring receiving surface 61d.

As shown in FIG. 1, the safety device 50 configured as described above is externally fitted to the container / syringe main body 10. In addition, in the safety device 50 in this state, the pressing ring 60 is in a state of pressing the return prevention stopper 54, whereby the return prevention stopper 54 protrudes inward in the radial direction.
Further, the engaging projections 44 and 44 of the finger grip 40 are fitted into the engaging holes 58b and 58b of the pair of engaging plates 58 and 58 of the safety device 50, respectively, and the engaging plates 58 and 58 and the engaging projections 44 and 44 are fitted. And the safety device 50 is fixed to the finger grip 40.

The cylindrical coil spring 70 that can be expanded and contracted in the direction of the axis O has a rear end located between the cylindrical portion 32 and the luer lock portion 34 in the hub luer lock 30 of the syringe body 10 for both containers and the front side. The front end is brought into contact with the spring receiving surface 61d of the spring receiving member 61 and stored in a compressed state while being brought into contact with the facing contact step portion 30a.
That is, as described above, when the engagement plate 58 and the locking projection 44 are in the locked state, the movement of the safety device 50 via the spring receiving member 61 due to the biasing force of the coil spring 70 is prevented. It is.

  As described above, when the engagement plate 58 of the safety device 50 and the locking projection 44 of the finger grip 40 are in the locked state, the safety device 50 is connected to the outer cylinder 20 and the hub luer lock of the syringe body 10 for both containers. The position of the safety device 50 in this state is the first position where the safety device 50 is detached from the injection needle 37 and exposes the injection needle 37. The engaging plate 58 and the locking projection 44 constitute a first holding means for locking the safety device 50 at the first position.

  When the safety device 50 is located at the first position, the end of the engagement plate 58 of the safety device 50 extends so as to protrude rearward from the flange surface 46 of the finger grip 40. .

  Next, the slide member (lock release member) 80 for releasing the lock by the first holding means will be described. The slide member 80 is slidably disposed on the flange surface 46 of the finger grip 40, and includes a slide plate 81 having a substantially rectangular plate shape, and a surface plate surface of the slide plate 81 (a container-use syringe). 1 is an operation plate 87 extending vertically from 81a. Further, the slide member 80 has a symmetrical shape with the straight line m1 as the center as shown in FIG.

  The slide plate 81 has a substantially rectangular plate shape in which the extending direction of the straight line m1 is the longitudinal direction and the direction orthogonal to the longitudinal direction is the short direction. Further, the surface facing the thickness direction of the front plate surface 81 a is a back plate surface 81 b, and the back plate surface 81 b is slidable on the flange surface 46 by contacting the flange surface 46. Further, a slide plate locking portion 81c that protrudes in a convex curved shape is located near one side in the longitudinal direction of the back plate surface 81b (upper side in FIG. 9) and in the center in the short direction, that is, on the straight line m1. Is formed. The slide plate locking portion 81 c can be locked with the locking recess 46 a of the flange surface 46 of the finger grip 40.

  Further, the distance between the pair of side surfaces 82, 82 along the longitudinal direction of the slide plate 81 is narrower on the other side (lower side in FIG. 9) than the one side, that is, the side surface 82. , 82 are located closer to one side and spaced apart from each other at a predetermined interval, and are located closer to the other side and separated from each other at an interval smaller than the interval between the first side surfaces 82a, 82a. Second side surfaces 82b and 82b are provided. In each of the side surfaces 82 and 82, the boundary portions between the first side surfaces 82a and 82a and the second side surfaces 82b and 82b become closer to each other from one side to the other side, that is, in the flange surface 46. The inclined side surfaces 82c and 82c are gradually inclined in the radial direction in the arranged state.

As shown in FIG. 9, a through hole 83 that penetrates the slide plate 81 in the thickness direction is formed at the center of the slide plate 81 in the short direction, that is, on the straight line m <b> 1.
The through-hole 83 is disposed closer to the other side, and has a large diameter hole 84 having a predetermined inner diameter D1, and a small diameter continuously extending from the large diameter hole 84 toward the one side while maintaining the predetermined inner diameter D2. And a slit 85. The inner diameter D2 of the small-diameter slit 85 is smaller than the inner diameter D1 of the large-diameter hole 84.

  Further, on one side of the through-hole 83 of the slide plate 81 as described above, there is provided an operation plate 87 that is vertically provided from the front plate surface 81a and has a plate shape extending in the short direction. It has been.

  A state in which such a slide member 80 is attached to the finger grip 40 is shown in FIG. The slide member 80 is disposed closer to one side (the upper side in FIG. 11) of the flange surface 46 with the back plate surface 81 b being brought into surface contact with the flange surface 46 of the flange portion 45. At this time, the pair of first side surfaces 82 a, 82 a of the slide member 80 come into contact with the side guides 47 a, 47 a of the first guide portions 47, 47 of the flange portion 45, respectively, and the pair of second side surfaces 82 b of the slide member 80. , 82b contact the side guides 48a, 48a of the second guide portions 48, 48. Further, the second side surfaces 82b and 82b of the slide member 80 are in contact with the inner side surfaces of the engagement plates 58 and 58 of the safety device 50 at the first position, respectively. Further, among the through holes 83 of the slide member 80, the center of the large diameter hole 84 coincides with the axis O, whereby the large diameter hole 84 and the insertion hole 43 at the rear end of the finger grip 40 (not shown in FIG. 11). Will be in communication.

  Thus, the state in which the second side surfaces 82b and 82b are in contact with the engagement plates 58 and 58 and the center of the large-diameter hole 84 coincides with the axis O is that the slide member 80 is closer to the radially outer side of the container-use syringe 1. It is a standby position located at In this standby position, the slide member 80 is locked onto the flange surface 46 by fitting the slide plate locking portion 81 c into the locking recess 46 a of the flange surface 46.

  Further, as shown in FIG. 12, the slide member 80 slides inward in the radial direction of the container-use syringe 1, that is, in the slide direction, and the first side surfaces 82a and 82a of the slide member 80 are engaged with the engagement plate 58. 58 and the position where the axis O exists in the small-diameter slit 85 is the release position where the slide member 80 is positioned closer to the inside in the radial direction of the container-use syringe 1. At this time, the distance between the axis O and the end located on the most one side of the small-diameter slit 85 is at least half the length of the inner diameter D2 of the small-diameter slit 85.

  As shown in FIG. 1, a plunger rod 90 for pushing a rear stopper 20d for liquid-tight sealing the inside of the outer cylinder 20 from the rear side toward the front side is slid from the rear side. The through hole 83 of the member 80 and the insertion hole 43 of the finger grip 40 are inserted into the outer cylinder 20.

  The plunger rod 90 includes a rod portion 91 extending along the axis O, and a screwed portion (not shown) that is screwed into the stopper and coupled to the stopper is provided on the front end side of the rod portion 91. On the rear end side, there is provided a pushing portion 95 that applies pressure when pushing the stopper.

The rod portion 91 has a large-diameter rod portion 92 and a small-diameter rod portion 93 having different outer diameters.
As shown in FIG. 13, the large-diameter rod portion 92 has a cross-sectional shape perpendicular to the axis O in which two slits 92 a are cut from one side and the other side facing the one side with respect to a substantially circular shape. It has a shape.
Further, the outer diameter d1 of the large diameter rod portion 92 is formed to be equal to or slightly smaller than the inner diameter D1 of the large diameter hole 84 of the slide member 80 and larger than the inner diameter D2 of the small diameter slit 85. Accordingly, the large diameter rod portion 92 can be inserted into the large diameter hole 84 and cannot be inserted into the small diameter slit 85 with respect to the through hole 83.

As shown in FIG. 14, the small-diameter rod portion 93 has a substantially cross shape in which a cross-sectional shape perpendicular to the axis O is formed by notching four circumferentially spaced L-shapes with respect to a substantially circular shape. There is no.
The outer diameter d2 of the small diameter rod portion 93 is formed to be the same as or slightly smaller than the inner diameter D2 of the small diameter hole 85a of the slide member 80. Thereby, the small diameter rod portion 93 can be inserted into both the large diameter hole 84 and the small diameter hole 85a with respect to the through hole 83.
As shown in FIG. 13, the rod portion 91 extends in the axis O direction so that the large-diameter rod portion 92 occupies most of the rod portion 91, and is narrowed down to the rear end side of the first large-diameter rod portion 92. Thus, a small-diameter rod portion 93 is formed.

Such a plunger rod 90 moves the stopper forward by pushing the plunger rod 90 toward the front side before injection, which is before the plunger rod 90 is pulled most rearward to move the stopper forward. During the injection operation, the large-diameter rod portion 92 of the rod portion 91 is inserted through the through-hole 83 of the slide member 80, that is, the large-diameter hole 84.
On the other hand, when the injection is completed when the plunger rod 90 is pushed forward most and the stopper moves forward, the small diameter rod portion 93 of the rod portion 91 is inserted through the through hole 83 of the slide member 80.

  The container-use syringe 1 having the above-described configuration can cover the injection needle 37 with the safety device 50 by sliding the slide member 80 after completion of the injection. Hereinafter, the procedure will be described.

  FIG. 15 is a view of the finger grip 40 and the slide member 80 before injection from the rear side. In this state, the slide member 80 is disposed at the standby position, and the large diameter rod portion 92 of the plunger rod 90 is inserted through the large diameter hole 84 of the through hole 83 of the slide member 80. At this time, even if the slide member 80 is slid from the standby position to the release position side by pressing the operation plate 87 of the slide member 80 with, for example, the thumb while holding the finger grip 40, the large-diameter rod portion of the plunger rod 90 is used. Since the outer diameter d1 of 92 is larger than the inner diameter D2 of the small-diameter slit 85, the large-diameter rod portion 92 cannot be inserted into the small-diameter slit 85, and the sliding movement of the slide member 80 is hindered. Therefore, in this state, the slide member 80 cannot be slid to the release position.

  Even during the injection operation in which the plunger rod 90 is pushed in to perform an injection action on the patient, the large-diameter rod portion 92 of the plunger rod 90 is inserted through the through hole 83 of the slide member 80. As before, the slide member 80 cannot be slid to the release position.

  Then, when the injection is completed after the plunger rod 90 is completely pushed forward to complete the injection action on the patient, the small-diameter rod portion 93 of the plunger rod 90 is inserted into the through hole 83 of the slide member 80 as shown in FIG. It will be in the insertion state. At this time, since the outer diameter d2 of the small diameter rod portion 93 is smaller than the inner diameter D2 of the small diameter slit 85, the small diameter rod portion 93 enters the small diameter slit 85 from the large diameter hole 84 when the slide member 80 is slid in the sliding direction. Thus, the small diameter slit 85 is inserted. As a result, the small diameter rod portion 93 does not hinder the sliding movement, and the slide member 80 can be slid to the release position.

  When the slide member 80 is moved from the standby position to the release position, the engagement plates 58 and 58 that are in contact with the second side surfaces 82b and 82b of the slide member 80 at the standby position as shown in FIG. However, as shown in FIG. 17, it rides on the inclined side surfaces 82 c and 82 c as the slide moves, and comes into contact with the first side surfaces 82 a and 82 a of the slide member 80. That is, when riding on the inclined side surfaces 82c, 82c, the pair of engagement plates 58, 58 are elastically deformed so as to be separated from each other toward the radially outer side with the connection portion 58a with the outer peripheral surface of the safety device body 51 as a fulcrum. It is.

  As a result, the locking projections 44 of the finger grip 40 are disengaged from the engagement holes 58b of the engagement plate 58, and the locking state between the engagement plates 58 and the locking projection 44, that is, the locking state by the first holding means. Is released.

  When the locking state of the safety device 50 by the first holding means is thus released, the safety device 50 moves to the front side of the container-use syringe body 10 by the biasing force of the coil spring 70. At this time, the inclined surface 54b of the return prevention stopper 54 contacts the rear engaging surface 31b of the device engaging portion 31, but the inner periphery of the safety device 50 is formed so that the rear engaging surface 31b rides on the inclined surface 54b. The diameter is increased, and the return prevention stopper 54 gets over the device engaging portion 31.

  Thereafter, as shown in FIG. 18, when the entire area around the injection needle 37 is moved to the second position, which is completely covered by the safety device 50, the detachment prevention stopper 53 and the rear engagement surface 31 b of the device engagement portion 31. And the further forward movement of the safety device 50 is prevented. Further, even if the safety device 50 is moved in the rear end direction in this state, the return prevention stopper 54 and the front engaging surface 31a of the device engaging portion 31 are engaged with each other, so that the movement is prevented. That is, the safety device is locked at the second position by the second holding means including the detachment prevention stopper 53 and the return prevention stopper 54.

  According to the container / syringe 1 as described above, the first holding means (the engaging plate 58 and the locking convex portion 44) has the operation of sliding the sliding member 80 as the locking releasing member from the standby position to the releasing position. The locking of the safety device 50 at the first position can be released. Accordingly, since the safety device 50 moves to the second position covering the injection needle, it is possible to easily and surely cover the injection needle and improve handling and safety.

  In addition, the sliding movement of the slide member 80 can be easily performed with the thumb of the hand holding the finger grip 40 in a state where the finger grip 40 is held with one hand, so that the safety device 50 can be moved forward by the operation of only one hand. Can be moved to the side. Accordingly, it is possible to provide the container-use syringe 1 that is excellent in handleability.

  Further, in the container-use injector 1 of this embodiment, when the slide member 80 is slid from the standby position to the release position, the inclined side surface 82c of the slide member 80 faces the engagement plate 58 of the safety device 50 radially outward. By pushing up, the locking by the first holding means comprising the engagement plate 58 and the locking projection 44 can be easily and reliably released.

Further, before the injection and during the injection operation, the slide movement of the slide member 80 is prevented by the presence of the large-diameter rod portion 92 of the plunger rod 90, and when the injection is completed, the through-hole 83 of the slide member 80 is inserted into the small-diameter rod portion of the plunger rod 90. The slide movement of the slide member 80 is permitted by the state in which 93 is inserted.
Therefore, since the slide member 80 can be slid from the standby position to the release position only when the injection is completed, it is possible to reliably prevent the safety device 50 from malfunctioning before injection or during operation. .

  Further, since the coil spring 70 is provided between the front end of the safety device 50 and the hub luer lock 30, the coil spring 70 can be connected to the inner periphery of the safety device 50 even when the safety device 50 is moved forward by the coil spring 70. It will be in the state accommodated in the side. Therefore, the coil spring 70 is not exposed to the outside after the safety device 50 is activated. Accordingly, when the container-use syringe 1 with the injection needle 37 covered with the safety device 50 is dropped or the like, the coil spring 70 is not directly impacted, and therefore the coil spring 70 is not broken. In addition, the state where the injection needle is covered after the safety device 50 is operated can be reliably maintained.

  In addition, according to the container and syringe 1 of the present embodiment, the coil spring 70 can be retrofitted separately from when the safety device 50 is mounted. That is, since the spring receiving member 61 is separated from the safety device 50 and can be attached to the safety device 50, a coil spring is separately attached to the existing container / syringe equipped with the safety device 50. It becomes possible.

  Furthermore, once the injection needle 37 is covered with the safety device 50, the device engaging portion 31 is fixed from both sides in the direction of the axis O by the disengagement prevention stopper 53 and the return prevention stopper 54. That is, the safety device 50 can be reliably locked at the second position by the second holding means including the detachment prevention stopper 53 and the return prevention stopper 54. Therefore, the safety device 50 does not advance too far in the front end direction and is not detached from the container / syringe main body 10 or moved in the rear end direction so that the injection needle 37 is not exposed.

  Furthermore, since the return prevention stopper 54 of the safety device 50 is configured to protrude inward in the radial direction only when pressed by the pressing ring 60, the safety device 50 can be easily attached to the container-use syringe body 10. The safety device 50 can be securely fixed at the position where the injection needle is covered.

  That is, when the safety device 50 is mounted on the outer periphery of the container-use syringe body 10 from the front, the inclined surface 53a of the detachment prevention stopper 53 comes into contact with the front engagement surface 31a, and the inner periphery of the safety device 50 is easily bent. Accordingly, the detachment prevention stopper 53 can quickly get over the device engaging portion 31. Further, since the return prevention stopper 54 can be kept in a state of not projecting radially inward at the time of mounting, the return prevention stopper 54 does not come into contact with the device engaging portion 31. Therefore, the safety device 50 can be easily attached even if the stopper 53 and the stopper 54 are provided.

  Next, a second embodiment of the container and syringe according to the present invention will be described. In the second embodiment, the configuration of the safety device 120 is different from that of the safety device 50 of the container-use syringe 1 of the first embodiment, and the other configuration is the same. Therefore, in 2nd Embodiment, the same code | symbol is attached | subjected to the component similar to 1st Embodiment, and detailed description is abbreviate | omitted.

The safety device 120 of the second embodiment is thinly formed within a range in which strength can be maintained by a transparent and moderately flexible material such as polypropylene, for example, and has a substantially cylindrical shape centering on the axis O as shown in FIG. I am doing. In addition, the inner diameter of the inner peripheral surface 120a of the safety device 120 is formed to be approximately the same as or slightly larger than the outer diameter of the device engaging portion 31.
Further, a spring receiving member 61 similar to that of the first embodiment is attached to the front end of the safety device 120.

  As shown in FIGS. 19 and 20, on the inner peripheral surface of the safety device 120, there is a detachment prevention stopper 123 having an inclined surface 123a that protrudes radially inward and inclines radially inward as it goes to the front side. A plurality (four in this embodiment) are formed at equal intervals in the circumferential direction.

  Further, the front side of the disengagement prevention stopper 123, more specifically, the front side of the device engaging portion in the direction of the axis O direction protrudes radially inward and radially inward as it goes rearward. A plurality of (four in the present embodiment) anti-return stoppers 124 having inclined surfaces 124a inclined in the circumferential direction are formed at equal intervals in the circumferential direction.

  In the present embodiment, the detachment prevention stopper 123 and the return prevention stopper 124 are respectively formed at different locations in the circumferential direction of the safety device 120, but the detachment prevention stopper 123 and the return prevention stopper 124 are You may form in the location where the circumferential direction corresponds.

The detachment prevention stopper 123 and the return prevention stopper 124 as described above are different from each other in height from the inner peripheral surface 120a of the safety device 120, that is, in the radial inner direction from the inner peripheral surface 120a. It is supposed to be.
More specifically, in the present embodiment, the height of the return prevention stopper 124 from the inner peripheral surface 120a is lower than the height of the release prevention stopper 123 from the inner peripheral surface 120a. In addition, the height from the inner peripheral surface 120a of the plurality of detachment prevention stoppers 123 is the same, and the height from the inner peripheral surface 120a of the plurality of return prevention stoppers 124 is also the same.

  In addition, a plurality of slits 125 extending in parallel to the axis O are formed at intervals in the circumferential direction from the circumferential direction of the detachment prevention stopper 123 to the circumferential direction of the return prevention stopper 124.

  In such a safety device 120, engagement plates (engagement portions) 128 extending in the shape of a rectangular plate parallel to the axis O from the rear end of the outer peripheral surface to the rear are spaced by 180 ° in the circumferential direction. A pair is formed with a gap. The engagement plate 128 has the same configuration and function as the engagement plate 58 of the first embodiment.

  According to the safety device 120 of the second embodiment configured as described above, the safety device 120 can be easily mounted on the outer periphery of the outer cylinder 20 with a simple configuration, and the safety device 120 covers the injection needle. It can be securely fixed at a different position. Hereinafter, this point will be described with reference to FIGS.

FIG. 21 shows a schematic diagram of the safety device 120 and the device engaging portion 31 when the safety device 120 is mounted from the front side of the container-use syringe body 10. In FIG. 21, in order to simplify the explanation, the positions of the detachment prevention stopper 123 and the return prevention stopper 124 in the circumferential direction are the same.
As shown in FIG. 21 (a), at the time of mounting, the device engaging portion 31 of the hub luer lock 30 of the container / syringe main body 10 relatively moves from the rear to the front inside the safety device 120.

  Then, as shown in FIG. 21 (b), the inclined surface 123a of the disengagement prevention stopper 123 comes into contact with the front engaging surface 31a of the device engaging portion 31, and the device engaging portion 31 rides on the inclined surface 123a. Thus, the inner peripheral surface 120a of the safety device 120 at the position of the detachment prevention stopper 123 bends. Thereby, the inner peripheral surface 120a is expanded to an inner diameter through which the device engaging portion 31 can pass, and the device engaging portion 31 can pass over the disengagement prevention stopper 123 and pass forward.

Further, the bending of the inner peripheral surface 120a at the position of the anti-removal stopper 123 also affects the inner peripheral surface 120a at the position of the return prevention stopper 124, and the inner peripheral surface 120a of the return prevention stopper 124 is also enlarged. Become. Since the slit 125 is formed, the detachment prevention stopper 123 and the return prevention stopper 124 are each easily expanded in diameter.
At this time, since the return prevention stopper 124 is located at a position separated from the detachment prevention stopper 123, the diameter expansion amount of the inner peripheral surface of the return prevention stopper 124 is smaller than the diameter expansion amount of the inner peripheral surface around the detachment prevention stopper 123. It will be a thing.
Here, since the height of the return prevention stopper 124 is formed lower than the height of the detachment prevention stopper 123, even if the diameter expansion amount of the detachment prevention stopper 123 is smaller than the diameter expansion amount of the return prevention stopper 124, As shown in FIG. 21 (c), the device engagement portion 31 can pass over the return prevention stopper 124.

FIG. 22 shows a schematic diagram of the safety device 120 and the device engaging portion 31 when the safety device 120 is moved from the first position to the second position so as to cover the injection needle 37 with the safety device 120.
As shown in FIG. 22A, when the safety device 120 is moved from the first position to the second position, the device engaging portion 31 of the hub lure lock 30 of the container / syringe body 10 is located inside the safety device 120. Is relatively moved from front to back.

  22B, the inclined surface 124a of the return prevention stopper 124 abuts on the rear engagement surface 31b of the device engagement portion 31, and the inner peripheral surface of the safety device 120 at the position of the return prevention stopper 124. 120a is bent and the diameter is expanded to an inner diameter through which the device engaging portion 31 can pass. As a result, the device engaging portion 31 passes over the return prevention stopper 124 and passes therethrough.

  Further, the bending of the inner peripheral surface 120a at the position of the return prevention stopper 124 also affects the inner peripheral surface 120a at the position of the return prevention stopper 124, and the inner peripheral surface 120a at the position of the return prevention stopper 124 also increases in diameter. It will be. At this time, since the detachment prevention stopper 123 is located away from the return prevention stopper 124, the diameter expansion amount of the inner peripheral surface 120 a at the position of the detachment prevention stopper 123 is the diameter expansion of the inner peripheral surface 120 a at the position of the return prevention stopper 124. It will be smaller than the amount.

  Here, since the height of the detachment prevention stopper 123 is formed higher than the height of the return prevention stopper 124, in order for the device engaging portion 31 to pass through the detachment prevention stopper 123, the expansion prevention stopper 123 is expanded. The diameter must be larger than the diameter expansion of the return prevention stopper 124.

  However, as described above, the amount of expansion of the detachment prevention stopper 123 is smaller than that of the return prevention stopper 124, so that the inner peripheral surface 120 a at the position of the detachment prevention stopper 123 is expanded to a diameter that allows the device engagement portion 31 to pass. 22 (c), the disengagement prevention stopper 123 engages with the rear engagement surface 31b of the device engagement portion 31, and the device engagement portion 31 moves backward, The forward movement of the safety device 120 is prevented. In addition, after the device engagement portion 31 passes over the return prevention stopper 124, the return prevention stopper 124 is restored, and the relative movement of the device engagement portion 31 to the front, that is, the movement of the safety device to the rear is performed. Be blocked. Therefore, the safety device 120 does not advance too far in the front end direction and is not detached from the container / syringe main body 10 or moves in the rear end direction so that the injection needle 37 is not exposed.

  As described above, in the second embodiment, the height of the return prevention stopper 124 from the inner peripheral surface 120a is made lower than the height of the detachment prevention stopper 123 from the inner peripheral surface 120a. Accordingly, the safety device 120 can be easily attached, and the safety device 120 can be reliably fixed at a position where the injection needle is covered.

  As mentioned above, although embodiment of the syringe 1 for both containers which is this invention was described in detail, unless it deviates from the technical idea of this invention, it is not limited to these, A some design change etc. are possible.

DESCRIPTION OF SYMBOLS 1 Container combined syringe 10 Container combined syringe main body 20 Outer cylinder 20a Bypass path 20b Front stopper 20c Intermediate stopper 20d Rear stopper 30 Hubble lock 30a Contact step part 31 Device engagement part 31a Front engagement surface 31b Rear engagement surface 32 Cylindrical portion 33 Luer tip 33a Tapered outer peripheral surface 34 Luer lock portion 35 Fitting hole 36 Bypass chamber 36a Bypass groove 36b Bottom portion 36c Annular groove 37 Injection needle 38 Injection needle body 39 Needle base 39a Taper hole 39b Screw projection 40 Finger grip 41 Fitting part 42 Fitting hole 43 Insertion hole 44 Locking convex part 45 Flange part 46 Flange surface 46a Locking concave part 47 First guide part 47a Side guide 47b Upper guide 48 Second guide part 48a Side guide 48b Upper guide 50 Safety device 51 Safety device Chair body 53 Detachment stopper 53a Inclined surface 54 Return prevention stopper 54a Pressed surface 54b Inclined surface 55 U-shaped slit 56a Ring secondary stop projection 56b Ring secondary stop projection 57 Ring primary stop projection 58 Engagement plate 58a Connection portion 58b Joint hole 59 Engagement edge 60 Press ring 70 Coil spring 80 Slide member (lock release means)
81 Slide plate 81a Front plate surface 81b Back plate surface 81c Slide plate locking portion 82 Side surface 82a First side surface 82b Second side surface 82c Inclined side surface 83 Through hole 84 Large diameter hole 85 Small diameter slit 85a Small diameter hole 87 Operation plate 90 Plunger rod 91 Rod portion 92 Large-diameter rod portion 92a Slit 93 Small-diameter rod portion 95 Push-in portion 120 Safety device 123 Detach prevention stopper 123a Inclined surface 124 Return prevention stopper 124a Inclined surface 125 Slit 128 Engagement plate 128a Connection portion 128b Engagement hole

Claims (5)

A container-use syringe body in which a tube tip with an injection needle is attached to a front end side of an outer tube that is formed in a cylindrical shape along an axis and is filled with a drug solution, and a plunger rod is inserted from the rear end side of the outer tube And a container-use syringe equipped with a safety device that is slidably mounted on the outer periphery of the outer cylinder and covers the injection needle when moved forward,
A coil spring provided in a compressed state between the front end of the safety device and the tube tip, and biasing the safety device forward;
First holding means for locking the safety device against the bias of the coil spring;
An unlocking member provided so as to be slidable along the radial direction of the outer cylinder, and releasing the locking of the safety device by the first holding means by the sliding movement;
A large-diameter hole penetrating the locking release member;
A small-diameter hole that penetrates the locking release member so as to be continuous with the large-diameter hole along the sliding movement direction,
The plunger rod,
A large-diameter rod portion that can be inserted into the large-diameter hole and cannot be inserted into the small-diameter hole;
A small-diameter rod portion that is continuous to the rear side of the large-diameter rod portion and is capable of being inserted into the large-diameter hole and the small-diameter hole;
The large-diameter rod portion is inserted into the large-diameter hole during the injection operation of pushing the plunger rod forward, and the small-diameter rod portion is inserted into the large-diameter hole when the injection is completed when the plunger rod is pushed forward. A container-use syringe characterized by being inserted. A spring receiving member that can be attached to the front end of the safety device is provided,
The container according to claim 1, wherein the coil spring is provided in a compressed state between the spring receiving member and the tube tip in a state where the safety device is mounted on an outer periphery of the cylinder. Syringe. Second holding means for holding the safety device at a position where the injection needle is covered is provided,
The second holding means is
A part of the cylinder tip is formed with an enlarged diameter, an end surface facing the front side is a front engaging surface, and an end surface facing the rear side is a rear engaging surface;
A return prevention stopper that protrudes from the inner peripheral surface of the safety device and that engages with the front engagement surface at a position where the safety device covers the entire area of the injection needle and prevents the safety device from moving backward. When,
Projecting rearward of the return prevention stopper on the inner peripheral surface of the safety device, the safety device engages with the rear engagement surface at a position covering the entire area of the injection needle, and moves forward of the safety device. 3. The container-use syringe according to claim 1, further comprising a detachment prevention stopper that prevents movement of the container. The detachment prevention stopper is formed so as to incline radially inward toward the front side,
The return prevention stopper is elastically deformable in the radial direction of the container-use syringe body,
A pressing ring is slidably provided on the outer peripheral surface of the safety device,
4. The slide device according to claim 3, wherein the return ring is slid to the position of the return prevention stopper to press the return prevention stopper radially inward to protrude from the inner peripheral surface of the safety device. The container combined use syringe described. The return prevention stopper is formed so as to incline radially inward of the container-use syringe body as it goes rearward, and the release prevention stopper of the container-use syringe body as it goes to the front side. It is formed to incline radially inward,
The height from the inner peripheral surface of the safety device of the return prevention stopper is formed lower than the height from the inner peripheral surface of the safety device of the detachment prevention stopper. Container combined use syringe.

Images