JP2007289459A - Syringe - Google Patents

Syringe Download PDF

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Publication number
JP2007289459A
JP2007289459A JP2006121559A JP2006121559A JP2007289459A JP 2007289459 A JP2007289459 A JP 2007289459A JP 2006121559 A JP2006121559 A JP 2006121559A JP 2006121559 A JP2006121559 A JP 2006121559A JP 2007289459 A JP2007289459 A JP 2007289459A
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Prior art keywords
protrusion
inner
inner hub
plunger
core rod
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JP2006121559A
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JP4736049B2 (en
Inventor
Yoshiharu Iwase
Shigeteru Tanaka
芳治 岩瀬
繁輝 田中
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Nipro Corp
ニプロ株式会社
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Priority to JP2006121559A priority Critical patent/JP4736049B2/en
Publication of JP2007289459A publication Critical patent/JP2007289459A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a syringe which enables a "zero point matching", and can house even a cannula having a long total length in the barrel. <P>SOLUTION: Even when a plunger 3 and a gasket 4 are moved to the advancing end, the rear end of an internal core rod 5 is housed in a cap 9 which is fitted on the plunger 3, and the internal core rod 5 is prevented from advancing. When the cap is removed, and the internal core rod 5 is advanced after using this syringe 1, a thinner section 4c which is formed on the gasket distal end is penetrated by an engaging means 11 which is provided on the internal core rod distal end, and a first protuberance 11b of the engaging means and a second protuberance 7h as an engaging means which is provided on the rear end of an internal hub 7 are engaged with each other. By making the internal core rod 5 retract with the internal core rod 5 and the internal hub 7 engaged, the internal hub 7 is separated from an external hub 8, and the cannula 6 together with the internal hub 7 can be housed in the barrel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a syringe, and more particularly to a syringe capable of storing a cannula in a barrel after use of the syringe.

Conventionally, a cylindrical barrel, an inner hub held by a holding mechanism at the tip of the barrel, a cannula fixed to the tip of the inner hub, a plunger that moves forward and backward in the barrel, and a tip of the plunger A syringe with a gasket is used.
In such a syringe, in order to prevent an accidental puncture accident in which a cannula after use is stuck in a medical staff, an engaging means and an engaged means are provided on the gasket and the inner hub. It is known that the coupling means and the engaged means are engaged to connect the gasket and the inner hub, the plunger is retracted, and the cannula can be accommodated in the barrel together with the inner hub. (Patent Document 1)
JP-A-2005-65708

Here, when the medicine is sucked by the syringe or blood is collected, it is generally performed that the plunger is once moved to the forward end to perform “zero point alignment”.
However, in the case of the syringe disclosed in Patent Document 1, if the plunger is moved to the forward end and “zero adjustment” is performed, the engaging means and the engaged means are engaged, and the gasket and the inner hub are connected. When the plunger was retracted, the cannula was also retracted, so “zero adjustment” could not be performed.
Further, for example, in the case of the syringe of Patent Document 1 described above, if the entire length of the cannula is longer than the length of the barrel, the entire cannula may not be accommodated even if the gasket is retracted to the retracted end of the barrel. It was difficult to do.
In view of such a problem, the present invention provides a syringe capable of accommodating the cannula in a barrel even if the cannula has a long overall length after use of the syringe, and further capable of “zeroing”. Is.

That is, the invention of claim 1 includes a cylindrical barrel, an inner hub held by a holding mechanism at the tip of the barrel, a cannula fixed to the tip of the inner hub, a plunger that moves forward and backward in the barrel, and a plunger And a gasket connected to the tip of the
In the syringe in which the inner hub is detached from the holding mechanism and the cannula can be pulled into the barrel together with the inner hub,
A through-hole penetrating the plunger and gasket is formed at the center of the plunger and gasket, and an inner core rod is provided in the through-hole so as to be movable forward and backward, and a thin portion for closing the through-hole is formed in the gasket. And an engagement means for engaging each other at each of the front end of the inner core rod and the rear end of the inner hub,
The inner core rod is advanced with respect to the plunger, and the engaging means provided at the tip of the inner core rod is allowed to penetrate the thin portion and engage with the engaging means provided at the rear end of the inner hub. In addition, the inner core rod is retracted with respect to the plunger, and the cannula is accommodated in the through hole together with the inner hub.

According to the above invention, if the inner core rod is housed in a through hole formed in the plunger and the gasket, and the engaging means provided at the inner core rod tip is positioned behind the thin portion formed at the gasket tip, The above-mentioned “zero adjustment” can be performed by moving the plunger forward.
On the other hand, after the syringe is used, the inner core rod projects forward from the gasket by moving the inner core rod forward and engaging means provided at the tip of the inner core rod through the thin portion. The engaging means of the core rod and the inner hub engage with each other.
If the inner core rod is retracted from the plunger from that state, the cannula can be accommodated in the through-hole together with the inner hub, and an accidental puncture accident in which the used cannula is stuck in the medical staff. Can be prevented.
Further, when the engaging means and the inner hub are retracted to the retracted end with respect to the plunger, the inner hub can be moved backward as compared with the case of the syringe of Patent Document 1, so It can be stored even if it exists.

1 to 4 are sectional views of a syringe 1 according to the present invention. Hereinafter, the left side of the drawing will be described as the distal end side or the front side of the syringe 1.
The syringe 1 has a cylindrical barrel 2 for storing blood, medicine, etc., a plunger 3 that moves forward and backward in the barrel 2, and a barrel 3 that is connected to the tip of the plunger 3 to keep the barrel 2 airtight. The gasket 4 that moves forward and backward, the inner core rod 5 that is provided in the plunger 3 and the gasket 4 so as to be movable forward and backward, the inner hub 7 to which the cannula 6 is fixed at the tip, and the inner hub 7 are held in the barrel 2 In addition, the outer hub 8 as a holding mechanism having a leak preventing function and a cap 9 attached to the rear end of the plunger 3 are configured.
Further, the syringe 1 of this embodiment is provided with engaging means described later at the front end of the inner core bar 5 and the rear end of the inner hub 7, and the inner core bar 5 and the inner hub 7 are engaged by the engaging means. When the inner core bar 5 is retracted in the combined state, the cannula 6 can be accommodated in the barrel 2 together with the inner hub 7.
1 shows a state of “zero adjustment” of the syringe 1, and FIG. 2 shows a state where the inner core bar 5 is retracted and the cannula 6 is housed in the barrel 2.
3 and 4 are enlarged views of the distal end portion of the syringe 1, FIG. 3 shows the state of FIG. 1, and FIG. 4 shows the state where the inner core rod 5 and the inner hub 7 are engaged. Each state is shown.

The barrel 2 includes a cylindrical chemical chamber 2a and a coupling portion 2b that is positioned in front of the chemical chamber 2a and to which the outer hub 8 is coupled. A barrel-side flange 2c is provided at the rear end of the chemical chamber 2a. Is formed.
A scale for measuring a drug or blood volume is printed on the outer peripheral surface of the chemical liquid chamber 2a, and a fifth protrusion 2d is formed on the rear end of the inner peripheral surface of the chemical liquid chamber 2a toward the inner periphery. The plunger 3 is prevented from falling off.
The coupling portion 2b is manufactured to have a diameter that can accommodate the inner hub 7, and has a tapered shape that decreases in diameter toward the tip. A third protrusion 2e bulging toward the inner periphery is formed on the inner peripheral surface of the coupling portion 2b. The third protrusion 2e prevents the inner hub 7 from retreating. (See Figure 3)

A through hole 3a through which the inner core rod 5 moves forward and backward is formed in the center of the plunger 3, and four plate-like members 3b are provided radially around the through hole 3a.
A disc-shaped pressing portion 3c and a connecting portion 3d for connecting to the gasket 4 are formed at the tip of the plate-like member 3b, and a plunger-side flange 3e is provided at the rear end of the plate-like member 3b. Yes.
The through hole 3a is formed from the front end to the rear end of the plunger 3, and a sixth protrusion 3f for locking the inner core rod 5 is formed in front of the through hole 3a. A seventh protrusion 3g for preventing the inner core bar 5 from falling off is formed.
The pressing portion 3c is manufactured to have substantially the same diameter as the inner diameter of the chemical liquid chamber 2a of the barrel 2, and when the plunger 3 is moved backward, the plunger 3 is engaged with the fifth protrusion 2d of the chemical liquid chamber 2a. It is designed not to fall out from the barrel 2.
The connecting portion 3d is formed so as to be connected to a connecting portion 4b formed at the rear end portion of the gasket 4. By connecting the connecting portions 3d and 4b to each other, the plunger 3 and the gasket 4 are connected to each other. It can be moved forward and backward as a unit.

The gasket 4 is made of, for example, a resin such as natural rubber or elastomer, has elasticity, partitions the chemical chamber 2a of the barrel 2 in an airtight state, and has a through hole in the center from the front end to the rear end. 4a is formed.
As shown in FIG. 3, the through hole 4a is formed to have a diameter substantially the same as or slightly larger than the through hole 3a of the plunger 3, and a connecting portion 3d of the plunger 3 is connected to the rear end of the through hole 4a. A connecting portion 4b that is connected to each other is formed.
A thin portion 4c is formed integrally with the gasket 4 at the tip of the through hole 4a, and the through hole 4a is sealed in an airtight state by the thin portion 4c.
In this embodiment, the thickness of the thin portion 4c is about 0.1 to 1 mm, preferably 0.5 to 0.7 mm, and the internal pressure of the barrel 2 fluctuates due to the forward and backward movement of the plunger 3. Also, the thickness is set such that the thin portion 4c is not broken.

Next, the inner core rod 5 is manufactured with a diameter capable of moving back and forth in the through holes 3a and 4a formed in the plunger 3 and the gasket 4, and the rear end is enlarged toward the outer peripheral side. An operation portion 5 a is formed, and an engaging means 11 is connected to the tip of the inner core rod 5.
A weakened portion 5b having a reduced diameter is formed in the middle of the inner core rod 5, and the inner core rod 5 can be broken and separated by bending the inner core rod 5 at the position of the weakened portion 5b. Yes.
As shown in FIGS. 3 and 4, a seventh protrusion 5 c is formed on the outer peripheral surface of the inner core bar 5 on the front end side, and forward to the sixth protrusion 3 f formed in the through hole 3 a of the plunger 3. The inner core bar 5 is prevented from retreating when further contacted, and the inner core bar 5 is prevented from falling off by contacting the seventh protrusion 3g from the front.
The engaging means 11 is made of a metal such as stainless steel or a resin such as natural rubber or elastomer having a predetermined hardness, and has a cylindrical cylindrical portion 11a and a tip of the cylindrical portion 11a toward the inner peripheral surface. The rear end of the cylindrical portion 11a and the front end of the inner core bar 5 are fixed to each other by means such as bonding with an adhesive, caulking, or insert molding.
The outer diameter of the cylindrical portion 11a is manufactured to be the same diameter as the inner core rod 5, and the first protrusions 11b are a plurality of metals formed at equal intervals along the opening at the tip of the cylindrical portion 11a. It is a piece or resin piece.
In addition, you may make it form the said 1st protrusion 11b cyclically | annularly along the opening part of the said cylindrical part 11a.

The inner hub 7 connects a cylindrical main body portion 7a located at the front, two stays 7b protruding from the rear portion of the main body portion 7a, and both stays 7b formed toward the rear end of the stay 7b. And an acute angle portion 7c.
As shown in FIG. 4, a holding part 7d for holding the cannula 6 and a communication hole 7e for connecting the cannula 6 and the barrel 2 are formed at the center of the main body part 7a. The holding part 7d and the cannula 6 are It is fixed with an adhesive or the like.
Further, a taper shape 7f that decreases in diameter toward the front is formed on the outer periphery of the main body 7a, and an eighth protrusion 7g that bulges toward the outer periphery is formed behind the taper shape 7f. Yes.
The stay 7b is provided at the rear end of the main body portion 7a so as to face the upper and lower positions in the figure with the communication hole 7e interposed therebetween. By the space between the two stays 7b, the communication hole 7e and the barrel 2 are arranged. The chemical chamber 2a communicates with the other.
A second protrusion 7h is formed as an engaging means for the inner hub 7 at the rear portion of the stay 7b, and a first protrusion 11b of the engaging means 11 provided at the tip of the inner core rod 5 is formed in the front of the figure. The engaging surface is formed, and on the rear side is an inclined surface constituting the acute angle portion 7c.
An end on the outer peripheral side of the second protrusion 7h is manufactured to have a larger diameter than the inner diameter of the cylindrical portion 11a of the engaging means 11, and when the second protrusion 7h is positioned in the cylindrical portion 11a, the second protrusion 7h approach each other and elastically deform the stay 7b inward. (See Figure 4)
The two second protrusions 7h are formed at different positions in the front-rear direction, and when the first protrusion 11b and the second protrusion 7h are engaged, only one (the lower side in the drawing) engagement surface is the first engagement surface. It engages with the protrusion 11b. (See Figure 4)
Further, the stay 7b is formed with a fourth protrusion 7i between the second protrusion 7h and the main body 7a, and the fourth protrusion 7i is connected to the connecting portion 2b of the barrel 2 as shown in FIG. The inner hub 7 is prevented from retreating by engaging with the third protrusion 2e formed on the inner surface.
As shown in FIG. 4, the fourth projections 7i approach each other when the second projections 7h are located in the cylindrical portion 11a, and the stays 7b are elastically deformed inward so that they approach each other. The engagement state between the fourth protrusion 7i and the third protrusion 2e is eliminated.
The acute angle portion 7c connects the rear end portions of the two stays 7b to each other and is sharpened toward the rear end so that the resin-made thin portion 4c can be penetrated by the acute angle portion 7c. It has become.
Since the thin portion 4c is made of a resin such as natural rubber or elastomer, the engaging means 11 is advanced without providing the acute angle portion 7c, and the thin portion 4c is penetrated by the forward force. It is also possible.

The outer hub 8 includes an inner hub connecting portion 8a that is formed in the front and holds the inner hub 7, and a barrel connecting portion 8b that is formed in the rear and is connected to the connecting portion 2b of the barrel 2. Yes.
As shown in FIG. 3, a tapered shape 8c having the same shape as the tapered shape 7f of the inner hub 7 is formed on the inner circumference of the inner hub connecting portion 8a. The tapered shape 7f of the inner hub 7 and the tapered shape of the outer hub 8 are formed. By closely contacting the shape 8c, leakage of the chemical solution or the like in the barrel 2 is prevented.
Behind the tapered shape 8c is formed a step shape 8d that abuts against the tip of the eighth protrusion 7g of the inner hub 7 to restrict the forward movement of the inner hub 7, and an eighth step that abuts the step shape 8d. A ninth protrusion 8e is formed behind the protrusion 7g toward the inner periphery.
By engaging the ninth protrusion 8e and the eighth protrusion 7g of the inner hub 7, for example, even when a force is applied to the inner hub 7 by puncturing the patient with the cannula 6, the inner hub 7 moves backward. Can be prevented.
On the other hand, in a state where the engaging means 11 of the inner core bar 5 and the second protrusion 7h of the inner hub 7 are engaged and the inner core bar 5 and the inner hub 7 are connected, the inner core bar 5 is moved backward. When moved, the eighth protrusion 7g gets over the ninth protrusion 8e, and the inner hub 7 can be retracted together with the cannula 6.
The inner peripheral surface of the barrel connecting portion 8b is processed into a tapered shape that is the same shape as the connecting portion 2b of the barrel 2. When the connecting portion 2b is inserted into the outer hub 8, the outer hub 8 and the connecting portion 2b are connected to each other. The inner hub 7 is held by the barrel 2 in close contact with each other.
Here, when the syringe 1 is manufactured, the inner hub 7 is inserted from behind the outer hub 8 and connected to each other so that the tip of the inner hub 7 protrudes from the tip of the inner hub connecting portion 8a. By connecting the outer hub 8 and the inner hub 7 in advance and then inserting the cannula 6 into the holding portion 7b of the inner hub 7, an accident during manufacture is prevented.
Further, when the inner hub 7 and the outer hub 8 are connected to each other, the acute angle portion 7c formed at the rear end of the inner hub 7 is positioned forward of the rear end of the connecting portion 3d. An accident during manufacture due to the acute angle portion 7c is prevented.

As shown in FIG. 1, the cap 9 includes a large-diameter portion 9 a manufactured according to the diameter of the plunger-side flange 3 e of the plunger 3 and a small-diameter portion 9 b that can accommodate the operation portion 5 a of the inner core rod 5. It consists of and.
The large-diameter portion 9a is formed with knobs 9c at two upper and lower portions. When the cap 9 is attached to the plunger side flange 3e, the knob 9c protrudes and engages with the plunger side flange 3e. It is supposed to be.
When removing the cap 9, the rear end portion of the knob 9c is deformed to the inner peripheral side to release the engaged state with the plunger side flange 3e, and the cap 9 is removed.
Note that the number of the knobs 9c is not limited to the above-described two places. For example, even when the knob 9c is provided at one place, the engagement state between the cap 9 and the plunger 3 can be maintained.
The total length of the inside of the small diameter portion 9b is manufactured according to the length that the inner core rod 5 protrudes from the plunger side flange 3e, and the tip of the engaging means 11 abuts on the thin portion 4c of the plunger 3. Or, it is the amount of protrusion of the inner core rod 5 when close to each other.
The small-diameter portion 9b is manufactured to have a diameter that can accommodate the operation portion 5a of the inner core rod 5 (see FIG. 1) and can be fitted to the inner hub connecting portion 8a of the outer hub 8. (See Figure 3)
For this reason, the cap 9 of this embodiment can be attached to both the rear end of the plunger 3 and the tip of the outer hub 8. By attaching the cap 9 to the plunger 3, the plunger 3 can be attached. The inner core rod 5 is prevented from being pushed forward with respect to the plunger 3 when the head is advanced, and the cap 9 is mounted on the outer hub 8 so that it is housed in the barrel 2 as shown in FIG. The re-exposure of the canula 6 to the outside is prevented.

A method of using the syringe 1 having the above configuration will be described.
As a state before use, no chemical solution or the like is stored in the barrel 2, and the engaging means 11 located at the tip of the inner core rod 5 is in contact with the thin portion 4 c formed on the gasket 4. Alternatively, the cap 9 is attached to the rear end of the plunger 3.
When the medicine is sucked into the syringe 1 or blood is collected, the medical staff first advances the plunger 3 and positions the gasket 4 at the forward end to perform “zero adjustment”. (Figure 1)
At this time, the plunger 3 moves forward by pressing the cap 9 forward, but the operation portion 5a of the inner core bar 5 accommodated in the cap 9 is not pressed forward, and the inner core bar 5 Will not move forward against.
When this “zero point alignment” is performed, the canula 6 is punctured into a vial or a patient, and then the plunger 3 is retracted to allow the drug solution or blood to flow into the barrel 2. The medicine and blood inside can be released.
When the cannula 6 is punctured into a patient or the like, a force acts backward on the cannula 6 and the inner hub 7, but the eighth protrusion 7g of the inner hub 7 and the ninth protrusion 8e of the outer hub 8 are engaged. Further, since the fourth protrusion 7i of the inner hub 7 is engaged with the third protrusion 2e of the barrel 2, the rearward movement of the inner hub 7 is restricted. Further, the taper shapes 7f and 8c formed in the inner hub 7 and the outer hub 8 prevent the drug solution and blood in the barrel 2 from leaking between them.

When the use of the syringe 1 is completed, the canula 6 is stored in the barrel 2 as follows in order to prevent an accident that the canula 6 is accidentally punctured by a medical staff.
First, the knob 9c of the cap 9 is operated to remove the cap 9 from the plunger 3 to expose the operation portion 5a of the inner core bar 5. From this state, the operation portion 5a is pushed forward to move the inner core. The rod 5 is advanced relative to the plunger 3.
At this time, the engaging means 11 at the tip of the inner core rod 5 is in contact with or close to the thin portion 4c of the gasket 4, and by moving the inner core rod 5 forward, the thin portion 4c is pressed forward, and the thin portion 4c is separated from the tip of the gasket 4 and penetrated by the engaging means 11. (Fig. 4)
Thereafter, when the inner core rod 5 is further advanced and the first protrusion 11b of the engaging means 11 comes into contact with the inclined surface of the second protrusion 7h formed on the inner hub 7, the second protrusion 7h approaches each other, When the first protrusion 11b moves forward beyond the second protrusion 7h, the second protrusion 7h and the first protrusion 11b are engaged, and the inner core bar 5 and the inner hub 7 are connected.
At this time, when the first protrusion 11b and the second protrusion 7h are engaged, the end face on the outer peripheral side of the second protrusion 7h comes into contact with the inner wall of the cylindrical portion 11a, so the stay 7b does not return completely, Since the state where the fourth protrusions 7i are close to each other is maintained, the engagement state with the third protrusion 2e formed on the coupling portion 2b of the barrel 2 is released.
Even when the inner core rod 5 is advanced and the engaging means 11 cannot penetrate the thin portion 4c, the inner core rod 5 is advanced as it is to deform the thin portion 4c forward. Then, the thin portion 4c reaches the acute angle portion 7c at the rear end of the inner hub 7, and the thin portion 4c can be penetrated by the acute angle portion 7c.

When the inner core bar 5 and the inner hub 7 are connected in this manner, the medical staff grasps the operation portion 5 a of the inner core bar 5 and moves the inner core bar 5 backward with respect to the plunger 3.
Since the engagement state between the fourth protrusion 7i and the third protrusion 2e is released, the eighth protrusion 7g of the inner hub 7 gets over the ninth protrusion 8e of the outer hub 8 by applying a required force. The inner hub 7 is separated from the outer hub 8 and the barrel 2.
At this time, since the position of the engaging surface of the second protrusion 7h formed on the inner hub 7 is different in the front and rear, when the inner core bar 5 is retracted and the inner hub 7 is separated from the outer hub 8, The inner hub 7 and the canula 6 start to tilt toward the first projection 11b.
From this state, the inner core rod 5 is further retracted, the seventh projection 5c of the inner core rod 5 gets over the sixth projection 3f of the through hole 3a, and the whole including the tip of the cannula 6 together with the inner hub 7, the plunger 3 and the gasket 4 When pulled into the through holes 3a and 4a, the tip of the cannula 2 comes close to or contacts the wall surface of the through hole 3a. (See Figure 2)
Thus, when the whole of the cannula 6 including the tip is completely accommodated in the through holes 3a and 4a, the fragile portion 5b reaches the outside of the plunger 3, and a medical worker uses the fragile portion 5b as a fulcrum. The plunger 3 is bent and broken.
Finally, the cap 9 removed from the barrel side flange 2 c of the plunger 3 is attached to the inner hub connecting portion 8 a of the outer hub 8.

From the above, even if the inner core rod 5 moves forward thereafter, the cannula 6 is prevented from moving forward by the plunger 3, the wall surfaces of the through holes 3 a and 4 a of the gasket 4, the third protrusion 2 e of the barrel 2, etc. 9 prevents the cannula 6 from protruding from the barrel 2, so that it is possible to prevent erroneous puncture due to a medical worker's error.
At this time, the engaging means 11 is retracted to the vicinity of the rear end of the plunger 3 so that the connecting portion between the engaging means 11 and the inner hub 7 is located behind the rear end of the barrel 2. Therefore, even the long canula 6 can be stored in the through holes 3a and 4a.
On the other hand, in the case of the conventional syringe like Patent Document 1 in which the gasket and the inner hub are connected and the cannula is stored in the barrel together with the inner hub, the gasket cannot be positioned in front of the rear end of the barrel. As a result, the length of the cannula that can be stored is reduced, and the cannula having a long total length cannot be stored.
Furthermore, by separating the inner core bar 5 at the position of the fragile portion 5b, it is possible to prevent the inner core bar 5 from being pushed thereafter and the canula 6 from jumping out of the barrel 2, and the separated inner core bar. 5 can be discarded not as medical waste but as normal waste.

In the above embodiment, the acute angle portion 7c is formed at the rear end of the inner hub 7. However, when the thin portion 4c of the gasket 4 can be surely penetrated by the engaging means 11 of the inner core rod 5, It is not necessary to provide the acute angle portion 7c.
A cylindrical portion 11a and a first projection 11b of the engaging means 11 provided at the tip of the inner core rod 5 are formed at the rear end of the inner hub 7, while the stay 7b is formed at the tip of the inner core rod 5. In addition, the second protrusion 7h may be provided to connect the inner core rod 5 and the inner hub 7.

Sectional drawing of the syringe 1 which concerns on a present Example. Sectional drawing of the syringe 1 which shows the state after use. The expanded sectional view of the front end side of the syringe shown in FIG. The expanded sectional view of the front end side of the syringe which shows the engagement state of an inner core rod and an inner hub.

DESCRIPTION OF SYMBOLS 1 Syringe 1 2 Barrel 2e 3rd protrusion 3 Plunger 4 Gasket 3a, 4a Through-hole 5 Inner core rod 7 Inner hub 7b Stay 7c Acute angle part 7h 2nd protrusion 7i 4th protrusion 11 Engagement means 11b 1st protrusion

Claims (9)

  1. A cylindrical barrel, an inner hub held at the tip of the barrel by a holding mechanism, a cannula fixed to the tip of the inner hub, a plunger that moves forward and backward in the barrel, and a gasket connected to the tip of the plunger With
    In the syringe in which the inner hub is detached from the holding mechanism and the cannula can be retracted in the barrel inner direction together with the inner hub,
    A through-hole penetrating the plunger and gasket is formed at the center of the plunger and gasket, and an inner core rod is provided in the through-hole so as to be movable forward and backward, and a thin portion for closing the through-hole is formed in the gasket. And an engagement means for engaging each other at each of the front end of the inner core rod and the rear end of the inner hub,
    The inner core rod is advanced with respect to the plunger, and the engaging means provided at the tip of the inner core rod is allowed to penetrate the thin portion and engage with the engaging means provided at the rear end of the inner hub. And the said inner core rod is retracted | retreated with respect to a plunger, and the cannula is accommodated in the said through-hole with the said inner hub, The syringe characterized by the above-mentioned.
  2.   When the inner core rod is retracted with respect to the plunger and the cannula together with the inner hub is accommodated in the through hole, the whole including the tip of the cannula is accommodated in the through hole. The syringe according to claim 1.
  3. The engaging means provided at the tip of the inner core rod is composed of a cylindrical cylindrical portion and a first protrusion protruding toward the inner peripheral side of the cylindrical portion,
    The engagement means provided at the rear end of the inner hub is composed of a second protrusion formed on the rear end side of the inner hub and protruding outward.
    The rear end portion of the inner hub is inserted into the cylindrical portion, and the first protrusion is positioned relatively forward of the second protrusion, so that the first protrusion and the second protrusion are engaged with each other. The syringe according to any one of claims 1 and 2, wherein:
  4. The second protrusion protrudes rearward from the inner hub and is formed at a rear end of a plurality of stays provided at positions facing each other across the center of the inner hub,
    When the inner core moves forward and the first protrusion and the second protrusion come into contact with each other, the stay is elastically deformed inward, and the first protrusion relatively moves forward relative to the second protrusion. The syringe according to claim 3, wherein the first protrusion and the second protrusion are engaged with each other when elastically deforming toward the outside.
  5.   The formation position of the engagement surface of the second protrusion with the first protrusion is relatively different in the front-rear direction, and the position where the second protrusion and the first protrusion are engaged is different in the front-rear direction. The syringe according to claim 4.
  6. Forming a holding portion having a diameter larger than that of the inner hub at the tip of the barrel, and forming a third protrusion bulging toward the inner periphery on the inner peripheral surface of the holding portion;
    The stay of the inner hub is formed with a fourth protrusion that engages the third protrusion from the front in a connected state of the inner hub and the holding mechanism.
    When the first protrusion and the second protrusion are engaged with each other, the stay is elastically deformed toward the inside, and the engagement state between the third protrusion and the fourth protrusion is released. The syringe according to claim 4 or 5, characterized by the above.
  7. The holding mechanism includes a barrel connecting portion that fits on the outer periphery of the holding portion of the barrel, and an inner hub connecting portion formed on the tip side of the barrel connecting portion,
    The taper shape of the same shape which is diameter-reduced toward the front is formed in the inner peripheral surface of the inner hub connection part of the said holding mechanism, and the front-end | tip part of the said inner hub, respectively. The syringe described.
  8. An acute angle part is formed at the rear end of the inner hub toward the rear,
    The syringe according to any one of claims 1 to 7, wherein when the thin portion is pressed forward by a tip of the inner core rod, the thin portion is penetrated.
  9. A cap that can be attached to the rear end of the plunger and the front end of the holding mechanism is provided,
    At the time of use of the syringe, a cap is attached to the rear end of the plunger, and an inner core rod protruding rearward from the plunger is stored.
    The syringe according to any one of claims 1 to 8, wherein a cap is attached to a tip of the holding mechanism after use of the syringe to prevent exposure of the stored cannula.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012231932A (en) * 2011-04-28 2012-11-29 Yoshino Kogyosho Co Ltd Injector
JP2012231931A (en) * 2011-04-28 2012-11-29 Yoshino Kogyosho Co Ltd Injector

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Publication number Priority date Publication date Assignee Title
JPH0220551A (en) * 1988-07-08 1990-01-24 Kanegafuchi Chem Ind Co Ltd Injection-moldable polyester resin composition
JP2001187142A (en) * 2000-01-05 2001-07-10 Jms Co Ltd Safe injector
US6613016B1 (en) * 2003-01-21 2003-09-02 Jen Chuan Ku Safety hypodermic syringe

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Publication number Priority date Publication date Assignee Title
JPH0220551U (en) * 1988-07-27 1990-02-09
IT1225440B (en) * 1988-12-07 1990-11-13 Nacci Gaetano Piston for syringes that automatically makes the hypodermic needle harmless, suitably modified, after use

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0220551A (en) * 1988-07-08 1990-01-24 Kanegafuchi Chem Ind Co Ltd Injection-moldable polyester resin composition
JP2001187142A (en) * 2000-01-05 2001-07-10 Jms Co Ltd Safe injector
US6613016B1 (en) * 2003-01-21 2003-09-02 Jen Chuan Ku Safety hypodermic syringe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012231932A (en) * 2011-04-28 2012-11-29 Yoshino Kogyosho Co Ltd Injector
JP2012231931A (en) * 2011-04-28 2012-11-29 Yoshino Kogyosho Co Ltd Injector

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