KR20070047090A - Disposable injector - Google Patents

Abstract

It is an object of the present invention to provide a disposable syringe which easily destroys its structural integrity and cannot be used twice.

The present invention is used as a syringe in combination with a needle means, and provides a disposable syringe having a barrel, a plunger, a carrier, and a sealing means, respectively. The barrel has two front and rear opening ends opposed to each other in its axial direction, and a front passage extending from the two front and rear opening ends facing each other along the axial direction and continuously communicating with the front opening end. It has a small diameter part formed, a large diameter part in which the rear passage communicating with the rear opening end is formed, and a circumferential wall formed of a shoulder part formed between the small diameter part and the large diameter part. The plunger has both front and rear ends opposed to each other, and is slidably installed in the rear passage, the front edge is in the rear passage, and the rear edge is always exposed to the outside from the rear opening end of the barrel. It can be operated from the outside. The carrier includes a tail portion extending forward from the shear edge of the plunger, a head portion facing the tail portion in front of the tail portion in the rear passage, between the tail portion and the head portion. It is interposed and has the middle part which consists of the pressing area | region adjacent to the said tail part, and the holding | maintenance area | region adjacent to the said head part. The sealing means is of a hollow shape having flexibility, and is formed integrally with the front end wall facing the shoulder part and the periphery of the front end wall in front of the carrier in the rear passage, and the large diameter part. A sealing end coupled to the sealing end to enable sealing, and a side wall extending rearward from the sealing end and forming an end having an opening to the rear, the side walls having inner and outer sides facing each other, When almost all portions except the end of the outer surface are spaced apart from the inner wall surface of the large diameter portion, and the inner surface is supported by the pressing region, and the shear wall after scanning is blocked by contacting the shoulder portion, The plunger continues to be pressed so that the carrier is along the axial direction with respect to the sidewalls. By moving to the small diameter part of the barrel, the curved segment which can be deformed by being deformed in the radial direction by the movement of the pressing area and the holding area are detachably held so that the plunger is continuously pressed after the injection. It has a holding segment which detach | desorbs from the said holding area and allows the movement of the said barrel of the barrel to the small diameter part.

Description

Disposable Syringe {DISPOSABLE INJECTOR}

The present invention relates to a syringe, and more particularly to a disposable syringe. 1 and 2, a conventional disposable syringe includes a barrel 11, a plunger 133, a sealing means 14, a plug 15, and a needle means ( It is used as a syringe in combination with 12).

The barrel 11 is provided with two front and rear opening ends 111 and 112 facing each other in the axial direction, and a passage 113 for communicating the openings of the two front and rear opening ends 111 and 112, and It is formed between the circumferential wall 116 which consists of the small diameter part 114 which adjoins the front opening end 111, and the large diameter part 115 which adjoins the rear opening end 112, and the small diameter part 114 and the large diameter part 115. It has the shoulder part 117 made.

In use, the needle means 12 are fitted over the front opening end 111 of the barrel 11. The plunger 13 is slidably arranged in the large diameter portion 115 of the barrel 11, and a tapered head 131 is formed at the front end thereof. The sealing means 14 is fitted on the head 131 to enable sealing sealing in the passage 113 of the large diameter portion 115 of the barrel 11. And the ventilation hole 132 which communicates with outside air is formed in the said sealing means 14. In addition, the plug 15 seals the vent hole 132 which is detachably fitted to the sealing means 14. The plug 15 is formed with a fitting portion 151 protruding forward from the sealing means 14. In addition, a retaining ring 118 proximate to the shoulder portion 117 is formed on the inner surface of the circumferential wall 116.

After the scanning is completed, the self-propelled pressurizes the plunger 134 to the front opening end 111 of the barrel 11 to bring the sealing means 14 into contact with the shoulder portion 117 of the barrel 11, and the plug 15. Is inserted into the small diameter portion 114, the fitting portion 151 of the plug 15 is coupled to the retaining ring 118, and the plunger 134 is pulled to the rear opening end 112 of the barrel 11, so that the plug ( In a state in which 15 is coupled to the retaining ring 118, it can be separated from the sealing means 14, thereby releasing the sealing of the vent hole 132, thereby disabling the function of the plunger 13. As a result, the structural integrity of the syringe is destroyed, leaving it unusable twice.

However, when the fitting 151 is pressurized and coupled to the retaining ring 118, sometimes the coupling force between the plug 15 and the sealing means 14 is greater than the coupling force between the fitting 151 and the retaining ring 115. It is large and there is a case in which inadequacies occur in which the plug 15 is not separated from the sealing means 14. Therefore, the syringe after injection may be recovered and reused, causing blood infection.

In view of the above, it is an object of the present invention to provide a disposable syringe which can easily destroy its structural integrity and cannot be used twice.

In order to achieve the above object, the present invention is used as a syringe in combination with a needle means, to provide a disposable syringe having a barrel, a plunger, a carrier, and a sealing means, respectively. The barrel has two front and rear opening ends opposed to each other in its axial direction, and a front passage extending from the two front and rear opening ends facing each other along the axial direction and continuously communicating with the front opening end. It has a small diameter part formed, a large diameter part in which the rear passage communicating with the rear opening end is formed, and a circumferential wall made up of a shoulder part formed between the small diameter part and the large diameter part. The plunger has both front and rear ends opposed to each other, and is slidably set in the rear passage, the front edge is in the rear passage, and the rear edge is always exposed to the outside from the rear opening end of the barrel. It can be operated from the outside. The carrier includes a tail portion extending forward from the shear edge of the plunger, a head portion facing the tail portion in front of the tail portion in the rear passage, the tail portion and the head portion. Interposed therebetween, it has a middle part which consists of the press area | region close to the said tail part, and the holding area close to the said head part. The sealing means is of a hollow type having flexibility and is integrally formed with the front end wall facing the shoulder part in front of the carrier in the rear passage, and the periphery of the front end wall, and at the large diameter part. A sealing end coupled to enable sealing sliding and a side wall extending rearward from the sealing end and forming a distal end having an opening to the rear, the side walls having inner and outer sides facing each other, Almost all portions except the end of the outer surface are separated from the inner wall surface of the large diameter portion, and the inner surface is supported by the pressing region, so that the shear wall after the injection is blocked by contacting the shoulder portion. The plunger continues to be pressed so that the carrier along the axial direction with respect to the side wall When moved to the small diameter portion of the barrel, the curved segment that can be deformed by being deformed in the radial direction by the movement of the pressurized region and the retaining region are detachably held so that the plunger continues after the injection. It is detached from the holding region by being pushed, and has a holding segment that allows movement to a small diameter portion of the barrel of the carrier.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of the disposable syringe of this invention is described with reference to drawings. First, with reference to FIG. 3 and FIG. 4, the disposable syringes of 1st Embodiment of this invention are demonstrated. As shown, the disposable syringe in this embodiment is provided with the barrel 2, the plunger 4, the carrier 5, and the sealing means 6, in combination with the needle means 3, Used as a syringe. In addition, the needle means 3 is generally provided with a needle hub 31 and a needle kanule 32 fixed to the needle hub 31, as shown in FIG.

The barrel 2 extends from the two front and rear openings 231 and 232 facing each other on the axial direction and the two front and rear openings 231 and 232 facing and extending along the axial direction, respectively. And a small diameter portion communicating with the front opening end 231 and having a front passage 22 communicating with the needle casing 32 of the needle means 3 at the time of use, and a rear passage communicating with the rear opening end 232. A large diameter portion 21 is formed, and a circumferential wall 23 formed of a shoulder portion 24 formed between the small diameter portion and the large diameter portion.

The plunger 4 has front and rear ends 41 and 42 facing each other, and is slidably installed in the rear passage 21, and the front edge 41 is in the rear passage 21, and the rear edge. 42 is always exposed to the outside from the rear opening end 232 of the barrel 2 so that it can be manipulated from the outside.

The carrier 5 opposes the tail portion 517 extending forward from the front end 41 of the plunger 4 and the tail portion 517 in front of the tail portion 517 in the rear passage 21. A middle portion having a pressurization region close to the tail portion 517 and a holding region close to the head portion 523, interposed between the head portion 523, the tail portion 517, and the head portion 523. Have In this embodiment, the said middle part of the carrier 5 consists of both the separation of the tubular pressurization segment 51 and the tubular holding segment 52. As shown in FIG. The pressurizing segment 51 integrally extends from the tail portion 517 to the small diameter portion of the barrel 2 and therein is formed a cavity 511 which is opened at the extension end, and the inner wall of the cavity 511 is The engaging region 514 is formed, and its outer peripheral surface slightly converges from the tail portion 517 to the extended end, thereby forming the pressing region 516. In addition, a vent hole 515 is formed in the pressure segment 51 to communicate with the outside air. The retaining segment 52 extends from the head portion 523 to the rear opening end 232 of the large diameter portion of the barrel 2 and is inserted into the cavity 511, and the end 524 thereof is joined to the joining region 514. Is further inserted into a dead end in cavity 511, whereby its outer circumferential surface 521 is also locked to the engagement region 514. Moreover, the projection 527 as a holding | maintenance area | region between two annular grooves 525 and 526 and two annular grooves 525 and 526 which are exposed to the outer peripheral surface 521 of the holding segment 52 out of the press segment 51 is carried out. Is formed.

The sealing means 6 is flexible and has a hollow shape, the front wall 613 facing the shoulder 24 in front of the carrier 5 in the rear passage 21 and the periphery of the front wall 613. And a sealing end 615 which is formed integrally with and coupled to the large-diameter portion so as to enable sealing sealing, and an end 616 extending rearward from the sealing end 615 and having an opening to the rear. It consists of the side wall 612 which comprises. In addition, the side walls 612 have inner and outer sides 617 and 622 facing each other. Almost all portions except the end 616 of the outer surface 622 are separated from the inner wall surface of the large diameter portion. The end opening edge of the side wall 612 is in contact with the inner wall of the large diameter portion so as to seal sealingly and compresses between the outer surface 622 of the side wall 612 and the sealing end 615 and the end 616. 621 is formed, and when the annular chamber 621 is compressed by the plunger 4 being continuously pressurized after the injection, air is extruded from between it and the inner wall of the barrel 2 to form the side wall 612. It is comprised so that adsorption | suction to the inner wall surface of the barrel 2 like a sucker may be carried out. Thereby, the annular chamber 621 can be compressed and deformed by the plunger 4 being continuously pressed after the injection. The inner surface 617 also has a curved segment 610 and a retaining segment 618. The curved segment 610 is supported by the pressurized region 516, so that the plunger 4 is continuously pressed when the shearing wall 613 after the injection is in contact with the shoulder 24 to stop the carrier 5 Moving along the axial direction with respect to the side wall 612 to the small diameter portion of the barrel 2 can be deformed by pressing in the radial direction with the movement of the pressing area 516 accordingly. The holding segment 618 detachably holds the holding region 527 so that the plunger 4 is continuously pressurized after the injection so as to be detached from the holding region 527 and the barrel 2 of the carrier 5 can be removed. Allow movement to smaller diameters. The curved segment 610 of the sealing means 6 is supported by the pressurized region 516, and the holding segment 618 holds the holding region 527 to seal the vent hole 515. That is, between the carrier 5 and the sealing means 6 is liquid-tightly comprised.

5 and 7, after the scanning is completed, the plunger 4 is continuously pressed in the state in which the front end wall 613 of the sealing means 6 is in contact with the shoulder portion 24 so that the carrier 5 ) Moves along the axial direction with respect to the side wall 612 to the small diameter portion of the barrel 2, the curved segment 610 is pressed in the radial direction and deformed by the movement of the pressing area 516 accordingly, and the holding The engagement of the holding segment 618 in the region 527 is released, and the pressing segment 51 moves with the plunger 4 to the small diameter portion of the barrel 2, with which the holding segment 52 moves into the cavity. It is further inserted to a dead end in 511, and the outer peripheral surface 521 thereof is coupled to the engagement region 514. In this case, the annular chamber 621 is compressed so that air is extruded between the end opening edge of the side wall 612 and the inner wall of the barrel 2 so that the side wall 612 is adsorbed to the inner wall surface of the barrel 2 like the sucker. do. Thereafter, as shown in FIG. 8, when the plunger 4 is pulled to the rear opening end 232 of the barrel 2, the sealing means 6 is adsorbed to the inner wall surface of the barrel 2 at that time. Therefore, the carrier 5 is separated in the state of leaving it there, and moves together with the plunger 4 to the rear opening end of the barrel 2, thereby releasing the sealing of the vent hole 515 and thereby plunger 4 ) Can be disabled. Thereby, the structural integrity of the syringe is broken, leaving it unusable twice.

Next, what is shown in FIG. 9 is 2nd Embodiment of the disposable syringe of this invention. The present embodiment differs from the first embodiment in that the long rod-shaped blocking means 623 protrudes into the small diameter portion of the barrel 2 near the center of the front end wall 613 of the sealing means 6. Is in. Further, a plurality of ribs 625 are formed on the circumferential surface of the shielding means 623 in the small diameter front passage 22. As a result, the plunger 4 is continuously pressed after the injection, so that the plunger 4 can be inserted into the front passage 22 to block the front passage 22 together with the front wall 613. Therefore, when the plunger 4 is pulled to the rear opening end 232 of the barrel 2, the sealing means 6 is attracted to the inner wall surface of the barrel 2, while the blocking means 623 is the front passage ( With the plug 22 closed, the carrier 5 can be easily separated from the carrier 5 and the carrier 5 can move together with the plunger 4 to the rear opening end of the barrel 2.

10 is a modification of the said 2nd Embodiment. The difference from the second embodiment of this modification is that the length of the shielding means 623 is longer than the shielding means 623 in the second embodiment so that the entire front passage 22 is blocked.

Next, shown in FIG. 11 and FIG. 13 is a third embodiment of the present invention. In the present embodiment, a difference from the first embodiment is that a through hole 619 is formed near the center of the front end wall 613 of the sealing means 6, and the head portion 523 of the carrier 5 is provided. The protrusion 53 passes through the center through hole 619 at a position corresponding to the center through hole 619 of the front end face of the bottom face). The protrusion 53 is inserted into the front passage 22 by the plunger 4 being continuously pressurized after the injection to block the front passage 22, and the plunger 4 further continues the rear opening end 232 of the barrel. The sealing means 6 is left in contact with the shoulder portion 24 of the barrel 2 by being pulled by the < Desc / Clms Page number 5 >, and is separated from the sealing means 6 and the carrier 5 and the plunger 4 Together to the rear opening end 232 of the barrel 2.

Subsequently, what is shown in FIG. 14 is a modification of the said 3rd Embodiment. The difference from the said 3rd Embodiment of this modification is that the length of the protrusion 53 is longer than the protrusion 53 in 3rd Embodiment so that the whole front passage | channel 22 may be blocked.

Next, shown in Figs. 15 and 16 is a fourth embodiment of the present invention. In the present embodiment, a difference from the first embodiment is that a through hole 619 is formed near the center of the front end wall 613 of the sealing means 6, and the head portion 523 of the carrier 5 is provided. The blocking means 63 passes through the center through hole 619 at a position corresponding to the center through hole 619 of the front end face of the bottom face), and projects to the small diameter portion of the barrel 2. In addition, a plurality of ribs 631 are formed in the blocking means 63. The blocking means 63 is inserted into the front passage 22 to block the front passage 22 by continuously pressing the plunger 4 after the injection, and then the plunger 4 continues to the barrel 2. By means of being pulled by the rear opening end 232 and by a secure engagement between the plurality of ribs 631 and the front passage 22, the sealing means 6 contacts the shoulder 24 of the barrel 2 The pressure segment 51 can be separated from the retaining segment 52 and moved together with the plunger 4 to the rear opening end 232 of the barrel 2, while remaining in the front passage 22 in the open state.

And what is shown in FIG. 17 is a modification of the said 4th Embodiment. The difference from the fourth embodiment in this modification is that the length of the blocking means 64 is longer than the blocking means 63 in the fourth embodiment so that the entire front passage 22 is blocked.

18 is another modified example of the fourth embodiment. The difference from the said 4th Embodiment of this modification is that the long rod-shaped front-end | tip 651 of the interruption | blocking means 65 is divided into two directions forward so that the space | interval between them may expand gradually. Thereby, when the said interruption | blocking means 65 is inserted in the front passage 22, it can reliably engage with the said small diameter part in the front passage 22. As shown in FIG.

Next, shown in FIG.19 and FIG.21 is 5th Embodiment of this invention. In the present embodiment, the difference from the first embodiment is that the tail portion 517 and the head portion 523 of the carrier 5 are integrally formed, and an insertion hole 56 is formed in the carrier 5. The insertion hole 56 opens in the head portion 523 after passing through the middle portion in the axial direction. Thereby, the carrier 5 is deformed while pressing the side wall 612 of the sealing means 6 when the plunger 4 flexible in the radial direction is continuously pressed after the injection, It is released from the locking to the holding segment 618 and moves to the small diameter part of the barrel 2, and pressurizes the side wall 612 of the sealing means 6 in the pressing area 516 to adsorb | suck to the inner wall surface of the barrel 2. Making it easier.

Next, shown in FIG. 22 is a sixth embodiment of the present invention. In the present embodiment, a difference from the fifth embodiment is that a long rod-shaped blocking means 623 protrudes into the small diameter portion of the barrel 2 near the center of the shear wall 613 of the sealing means 6. It is in there. Further, a plurality of ribs 625 are formed on the circumferential surface of the blocking means 623 in the small diameter front passage 22. This blocking means 623 is inserted into the front passageway 22 by the plunger 4 being continuously pressurized after the injection to block the front passageway 22 with the shear wall 613, and the plunger 4 barrel When pulled to the rear opening end 232 of (2), the suction between the plurality of ribs 625 and the front passage 22 is secured to the inner wall surface of the barrel 2 of the side wall 612, and Together, the sealing means 6 is left in contact with the shoulder portion 24 of the barrel 2 and is easily separated from the carrier 5 so that the carrier 5 with the plunger 4 barrel 2 Can be moved to the rear opening end.

23 is a modification of the said 6th embodiment. The difference from the sixth embodiment of this modification is that the length of the blocking means 623 is longer than the blocking means 623 in the sixth embodiment so that the entire front passage 22 is blocked.

Next, shown in FIG. 24 is a seventh embodiment of the present invention. In the present embodiment, the difference from the fifth embodiment is that the clamping circumferential wall 55 is formed inside the insertion hole 56, and the blocking means 67 that is flexible in the radial direction is detached from the back. It is in possible narrowing. In more detail, the pinch end 674 and the insertion head 677 are formed in the blocking means 67. The pinched end 674 protrudes from the rear opening end 232 of the barrel 2, and is inserted into the insertion hole 516 and is pinched by the pinching circumferential wall 55. The insertion head 677 protrudes into the small diameter portion of the barrel 2 on the side opposite to the pinned end 674, so that the plunger 4 is continuously pressed after the injection, so that the shear wall 613 of the sealing means 6 After passing through the through-hole 619 formed near the center of the can be inserted into the front passage (22). A contact ring 672 is formed between the pinned end 674 and the insertion head 677. In addition, a plurality of ribs 675 are formed in the insertion head 677. Thereby, the insertion head 677 of the blocking means 67 is inserted into the front passage 22 so that the contact ring 672 contacts the front wall 613 of the sealing means 6, and then the plunger 4 is barreled. By being pulled into the rear opening end 232 of (2), the insertion hole 56 is detached from the blocking means 67 to move the plunger 4 to the rear opening end 232 of the barrel 2. Can be.

25 is a modification of the said seventh embodiment. In this modification, the difference from the seventh embodiment lies in that the length of the blocking means 68 is longer than the blocking means 67 in the seventh embodiment so that the entire front passage 22 is blocked. .

26 is another modification of the said seventh embodiment. In this modification, the difference from the seventh embodiment is that the long rod-shaped tip 695 of the blocking means 69 is divided into two parts forwardly so that the gap therebetween gradually widens. Thereby, when the said blocking means 69 is inserted in the front passage 22, it can reliably engage with the said small diameter part in the front passage 22. As shown in FIG.

Next, shown in FIG. 27 is an eighth embodiment of the present invention. In the present embodiment, the difference from the seventh embodiment is that the blocking means 67, 68, 69 are selectively inserted into the insertion hole 56 as needed, and the contact in the seventh embodiment is also performed. There is no such structure as the ring 672.

Next, shown in FIG. 28 is a ninth embodiment of the present invention. In the present embodiment, the difference from the eighth embodiment is that the pressing region 516 is planar. Thereby, when the curved segment 610 is deformed by being pressed in the radial direction by the movement of the pressing region 516 accordingly, the side wall 612 is only partially adsorbed to the inner wall surface of the barrel 2, but the plunger 4 Is pulled into the rear opening end 232 of the barrel 2, the carrier 5 and the carrier 5 with one of the blocking means 67, 68, 69 blocking the front passage 22 together with the shear wall 613. Separated, the carrier 5 can move with the plunger 4 to the rear opening end 232 of the barrel 2. Therefore, the structural integrity of the syringe of the present embodiment can also be destroyed.

Next, shown in FIGS. 29 and 30 is a tenth embodiment of the present invention. In the present embodiment, the difference from the sixth embodiment is that two serrated protrusions as the pressing region 516 and the holding region 527 are formed in the middle portion of the carrier 5, respectively, and the sealing means ( Two annular grooves as the curved segment 610 and the holding segment 618 are formed in the side wall 612 of 6), respectively.

31 is a modification of the said 10th embodiment. The difference from the tenth embodiment of this modification is that the length of the blocking means 623 is longer than the blocking means 623 in the second embodiment so as to block the entire front passage 22.

32 and 33 are the eleventh embodiment of the present invention. In the present embodiment, a difference from the tenth embodiment lies in the structure of the blocking means 67 and the middle portion. In more detail, the clamping end 674 and the insertion head 677 are formed in the blocking means 67. The pinched end 674 protrudes into the rear opening end 232 of the barrel 2, is inserted into the insertion hole 56, and is sandwiched by the pinched circumferential wall 55. In addition, a plurality of ribs 673 are formed in the pinned finger stage 674. The insertion head 677 protrudes into the small diameter portion of the barrel 2 on the side opposite to the pinned end 674, so that the plunger 4 is continuously pressed after the injection, so that the shear wall 613 of the sealing means 6 After passing through the through-hole 619 formed near the center of the can be inserted into the front passage (22). In addition, a plurality of ribs 675 are formed in the insertion head 677.

The middle portion has a tension region 57 extending rearward from the pressure region 516. In addition, the inner surface of the side wall 612 is interposed between the curved segment 610 and the retaining segment 618 so that the plunger 4 is blocked when the shear wall 613 after the injection is in contact with the shoulder 24. Is continually pressed so that the carrier 5 is further inserted to have a tension segment 62 that engages the tension region 57. Thereby, after the blocking means 67 is inserted into the front passage 22, the pinching circumferential wall 55 is cut off by the plunger 4 being pulled to the rear opening end 232 of the barrel 2. 67, when the carrier 5 and the plunger 4 are moved to the rear opening end 232 of the barrel 2, the tension region 57 presses the tension segment 62 backwards to close the sealing means ( 6) can be separated from the blocking means 67 inserted in the front passage 22.

34 is a modification of the said 11th embodiment. The difference from the eleventh embodiment of this modification is that the length of the blocking means 68 is longer than the blocking means 67 in the seventh embodiment so that the entire front passage 22 is blocked.

35 is another modified example of the said 11th embodiment. The difference from the eleventh embodiment of this modification is that the long rod-shaped tip 695 of the blocking means 69 is divided into two parts forwardly so that the gap therebetween gradually widens.

Next, shown in FIG. 36 and FIG. 37 is a twelfth embodiment of the present invention. The present embodiment differs from the eleventh embodiment in that the pressing segment 51 in which the pressing region 516 is formed and the holding segment 52 in which the holding region 527 is formed are separate, and the shielding means 67 is provided. It is provided in the head part 523 integrally. Thereby, after the blocking means 67 is inserted into the front passage 22, the head portion 523 is brought into contact with the shoulder portion 24 of the barrel 2 together with the front wall 613 of the sealing means 6. Leaving it in the state, when the plunger 4 is pulled to the rear opening end 232 of the barrel 2, the insertion hole 56 is detached from the blocking means 67 to push the pressure segment 51 to the plunger 4. Together with the rear opening end 232 of the barrel 2.

38 is a modification of the said 12th embodiment. The difference from the 12th embodiment in this modification is that the length of the blocking means 68 is longer than the blocking means 67 in the eleventh embodiment so that the entire front passageway 22 is blocked.

39 is another modified example of the twelfth embodiment. The difference from the 12th embodiment in this modification is that the long rod-shaped tip 695 of the blocking means 69 is divided into two parts forwardly so that the gap therebetween gradually widens.

As can be seen in the above-described embodiment, the disposable syringe of the present invention can be deformed by pressing the curved segment in the radial direction by the movement of the pressing area accordingly, so that By releasing the locking, it is possible to easily separate the carrier and the sealing means or to block the barrel front passage with the blocking means, destroying its structural integrity and making it impossible to use it again.

According to the above constitution, when the disposable syringe of the present invention is scanned in combination with needle means, the plunger is continuously pressed to move the carrier to the small diameter portion of the barrel along the axial direction with respect to the side wall, The curved segment can be deformed by pressing in the radial direction by the movement of the pressing region accordingly, thereby releasing the engagement of the holding segment to the holding segment, thereby destroying its structural integrity and making it impossible to use it again. .

1 is a cross-sectional view showing a conventional disposable syringe,

FIG. 2 is a cross-sectional view showing a state in which the plug is separated from the sealing means in the disposable syringe of FIG. 1; FIG.

3 is an exploded view showing the disposable syringe of the first embodiment of the present invention;

4 is a cross-sectional view showing a scanning state of the disposable syringe according to the first embodiment;

5 is a cross-sectional view showing a state in which the injection of the disposable syringe of the first embodiment is completed;

6-8 is sectional drawing which shows the operation | movement which isolate | separates the carrier from a sealing means in the disposable syringe of the said 1st Embodiment;

9 is a cross-sectional view showing an operation of separating the carrier from the sealing means in the disposable syringe according to the second embodiment of the present invention;

10 is a cross-sectional view showing an operation of separating the carrier from the sealing means in the modification of the second embodiment;

11 is a cross-sectional view illustrating a scanning state of a disposable syringe of a third embodiment of the present invention;

12 and 13 are sectional views showing an operation of separating the carrier from the sealing means in the disposable syringe according to the third embodiment;

14 is a cross-sectional view showing a state in which a carrier is separated from a sealing means in a modification of the third embodiment;

15 and 16 are cross-sectional views showing an operation of separating the carrier from the sealing means and the blocking means in the disposable syringe according to the fourth embodiment of the present invention;

17 is a cross-sectional view showing a state where a carrier is separated from a sealing means and a blocking means in a disposable syringe of a modification of the fourth embodiment;

18 is a cross-sectional view showing a state where a carrier is separated from a sealing means and a blocking means in a disposable syringe of another modification of the fourth embodiment;

It is sectional drawing which shows the scanning state of the disposable syringe of 5th Embodiment of this invention,

20 and 21 are sectional views showing an operation of separating the carrier from the sealing means in the fifth embodiment;

It is sectional drawing which shows the state which removed the carrier from the sealing means in the disposable syringe of 6th Embodiment of this invention.

23 is a cross-sectional view showing a state in which a carrier is separated from a sealing means in a modification of the sixth embodiment;

24 is a cross-sectional view showing a state where the carrier is separated from the sealing means and the blocking means in the disposable syringe according to the seventh embodiment of the present invention;

25 is a cross-sectional view showing a state where a carrier is separated from a sealing means and a blocking means in a modification of the seventh embodiment;

26 is a cross-sectional view showing a state where the carrier is separated from the sealing means and the blocking means in another modification of the seventh embodiment;

27 is an exploded view showing a disposable syringe of the eighth embodiment of the present invention;

28 is an exploded view showing a disposable syringe of a ninth embodiment of the present invention;

29 is a partial cross-sectional view showing a disposable syringe of a tenth embodiment of the present invention;

30 is a cross-sectional view showing a state where the carrier is separated from the sealing means in the tenth embodiment;

31 is a cross-sectional view showing a state where a carrier is separated from a sealing means in a modification of the tenth embodiment;

32 is a partial cross-sectional view showing a disposable syringe of an eleventh embodiment of the present invention;

33 is a cross-sectional view showing a state where the sealing means and the carrier in the eleventh embodiment are separated from the blocking means;

34 is a cross-sectional view showing a state where the sealing means and the carrier are separated from the blocking means in a modification of the eleventh embodiment;

35 is a cross-sectional view showing a state where the sealing means and the carrier are separated from the blocking means in another modification of the eleventh embodiment;

36 is a partial cross-sectional view showing a disposable syringe of a twelfth embodiment of the present invention;

37 is a cross-sectional view showing a state where the carrier is separated from the sealing means and the blocking means in the twelfth embodiment;

38 is a cross-sectional view showing a state where the carrier is separated from the sealing means and the blocking means in the modification of the twelfth embodiment;

39 is a cross-sectional view showing a state where the carrier is separated from the sealing means and the blocking means in another modification of the twelfth embodiment.

Brief description of the main symbols in the drawings

2: barrel 21: rear passage

22: front passage 23: main wall

231: front opening end 232: rear opening end

3: needle means 31: needle hub

32: Needle Cavelet 4: Plunger

41: shear edge 42: trailing edge

5: carrier 51: pressure segment

511: cavity 514: bonding area

515: vent 516: pressurized zone

517: Tail part 52: Retention segment

521: outer peripheral surface 523: head portion

524: terminal 525: annular groove

526: Fantasy Home 527: Retention Area

53: protrusion 55: narrowing wall

56: insertion hole 57: tensile area

6 sealing means 610 curved segment

612: side wall 613: shear wall

615: sealing end 616: end

617: Inner 618: Retention Segment

619: through hole 62: tensile segment

621: annular chamber 622: outer surface

623: blocking means 625: rib

63: blocking means 631: rib

64: blocking means 65: blocking means

651: tip 67: blocking means

672: contact ring 673: rib

674: The Order of the Partnership 675: Rib

677 insert head 68 blocking means

69: blocking means 695: tip

Claims (14)

In a disposable syringe used as a syringe in combination with a needle means, Small diameter portions having two front and rear opening ends facing each other on the axial direction, and a front passage extending from the two front and rear opening ends facing each other along the axial direction, and communicating with the front opening end. A barrel having a main wall formed with a large diameter portion formed with a rear passage communicating with the rear opening end, and a shoulder wall formed between the small diameter portion and the large diameter portion; It has both front and rear ends opposed to each other, and is slidably installed in the rear passage, the front edge is in the rear passage, and the rear edge is always exposed to the outside from the rear opening end of the barrel to operate from the outside. Plunger, which can be A tail portion extending forward from the shear edge of the plunger, a head portion facing the tail portion in front of the tail portion in the rear passage, interposed between the tail portion and the head portion; A carrier having a middle portion having a pressing area proximate to the tail portion and a holding area proximate to the head portion; It is a hollow type having flexibility, and is formed integrally with the front wall facing the shoulder portion in front of the carrier in the rear passage, and the periphery of the front wall, and the sealing sliding to the large diameter portion is provided. A sealing end that is joined so that it is possible, and a side wall extending rearward from the sealing end and forming an end having an opening to the rear, the side walls having inner and outer surfaces facing each other, Nearly all portions except the large diameter portion are separated from the inner wall surface of the large diameter portion, and the inner surface is supported by the pressing region, and the plunger continues to press when the shear wall after injection is blocked by contacting the shoulder portion. To the small diameter portion of the barrel along the axial direction with respect to the sidewall. In this case, the curved segment can be deformed by being deformed in the radial direction by the movement of the pressing region accordingly, and the holding region is detachably held so that the plunger is continuously pressed after the injection. And a sealing means having a holding segment detachable from the holding area and allowing movement of the carrier to the small diameter portion of the barrel. Disposable syringe. The method of claim 1, The end opening edge of the side wall is in contact with the inner wall of the large-diameter portion to enable sealing sliding so that a compressible annular chamber is formed between the outer surface of the side wall and the sealing end and the end, whereby the plunger after injection By being continuously pressurized, the annular chamber can be compressed and deformed. Disposable syringe. The method of claim 2, The middle portion of the carrier is tubular, a cavity integrally extending from the tail portion to the small diameter portion of the barrel, wherein a cavity is formed in the extending end, and the inner wall of the cavity is a joining region. Pressurized segment, Tube-shaped, extending from the head portion to the rear opening end of the large diameter portion of the barrel and inserted into the cavity, and the end thereof is coupled to the engaging region, so that the outer peripheral surface thereof is also formed when it is further inserted into the cavity. And a retaining segment engaged in the joining region, Thereby, when the plunger continues to be pressed after the injection, the head portion is blocked by the shoulder portion, so that the pressing segment moves with the plunger to the small diameter portion of the barrel, and the outer peripheral surface of the holding segment is engaged Coupled to an area, said carrier being easily disengaged from said sealing means Disposable syringe. The method of claim 3, wherein A ventilating hole communicating with the outside air is formed in the pressure segment. Disposable syringe. The method of claim 2, The distal opening edge of the side wall is extruded from the space between it and the inner wall of the barrel when the annular chamber is compressed by the plunger being continuously pressurized after the injection to adsorb the side wall to the inner wall surface like a sucker. Characterized in that it is configured to Disposable syringe. The method of claim 1, A blocking means protrudes into the small diameter portion of the barrel near the center of the shear wall of the sealing means, so that the plunger can be inserted into the front passage by being continuously pressed after the injection to block the front passage together with the shear wall. Characterized by Disposable syringe. The method of claim 1, A through hole is provided near the center of the shear wall of the sealing means, and a blocking means protrudes into the small diameter portion of the barrel through the center through hole at a position corresponding to the center through hole of the front end face of the head portion of the carrier. The plunger can be inserted into the front passage by being continuously pressurized after the injection to block the front passage. Disposable syringe. The method according to claim 6 or 7, The blocking means has an elongated rod shape, and a plurality of ribs are formed on the circumferential surface thereof and coupled to the front passage of the small diameter portion. Disposable syringe. The method according to claim 6 or 7, The long rod-shaped tip of the blocking means is divided into two parts so that the gap between them is gradually widened so that the blocking means can be surely combined with the small diameter portion in the front passage when the blocking means is inserted into the front passage. Disposable syringe. The method of claim 7, wherein An insertion hole is formed in the carrier, and the insertion hole passes through the middle portion in the axial direction and then opens to the head portion, and a pinching wall is formed therein, and in the radial direction. The flexible blocking means is detachably sandwiched from behind, and after the blocking means is inserted into the front passage, the plunger is detached from the blocking means by pulling the plunger to the open end of the barrel to remove the plunger. Characterized in that it can be moved to the open end of the barrel Disposable syringe. The method of claim 10, The clamping end and the insertion head are formed in the blocking means, the clamping end protrudes into the rear opening end of the barrel, is inserted into the insertion hole, and is sandwiched by the clamping circumferential wall, and the insertion head is connected to the clamping end. Protruding to the small diameter portion of the barrel on the opposite side, the plunger can be inserted into the front passage after passing through the center through hole by continuously pressing after the injection. Disposable syringe. The method of claim 11, wherein The middle portion has a tension region extending rearward from the pressing region, and the inner surface of the side wall is interposed between the curved segment and the holding segment so that the shear wall after scanning is blocked in contact with the shoulder portion. When the plunger is continually pressurized to have a tension segment that engages the tension region when the carrier is further inserted, Thereby, after the blocking means is inserted into the front passageway, the clamping wall is detached from the blocking means by pulling the plunger to the open end of the barrel, so that the carrier and the plunger are opened at the open end of the barrel. When moved, the tensioning region can pressurize the tensioning segment backwards to separate the sealing means from the blocking means inserted into the front passageway. Disposable syringe. The method of claim 1, A through hole is formed near the center of the shear wall of the sealing means, and a projection is projected to the small diameter portion of the barrel through the center through hole at a position corresponding to the center through hole of the front end face of the head portion of the carrier. The shoulder of the barrel is formed by inserting the plunger into the front passage by being continuously pressurized after the injection to block the front passage, and subsequently pulling the plunger into the open end of the barrel. Being left in contact with the part and separated from the sealing means so as to move together with the carrier and the plunger to the open end of the barrel. Disposable syringe. The method according to any one of claims 1 to 13, Between the carrier and the sealing means is configured to be liquid-tight Disposable syringe.