JPH07501960A - Syringe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Syringe The invention relates to a syringe as defined in the preamble of claim 1.

Such a syringe furthermore corresponds to the preamble of claim 11 if the same It is disclosed in the inventor's earlier Dutch patent No. 1m9000487.

After removal from the package, such syringes are sealed with a penetrable stopper. This device aspirates the injection solution from a damaged storage bottle. Piste in initial position The piston/piston rod assembly is in an extended state. When inserting the needle into the bottle The air present in the container is forced out into the bottle. Therefore, next the above assembly When retracting the bottle, the pressure inside the bottle will not decrease and the suction of the liquid will not weaken. . Before injecting the solution into the patient, first evacuate any residual air from the container and needle, and then raise the needle up. turn towards When the piston is pushed completely inward during injection, the connection with the needle leg is established. be called.

Syringes constructed in this manner require that the air inside the prepackaged syringe be completely sterile. This has the advantage of preventing contamination of the contents of the bottle. but , pre-packaged syringes are quite long and such pre-packaged syringes are large. The disadvantage is that it takes up a lot of space. Furthermore, if this syringe is operated incorrectly, However, there is also the disadvantage that the connection between the piston and the needle leg may occur prematurely. . Moreover, the stroke limiting means has a relatively complicated shape, which reduces manufacturing costs. There is also the problem of the influence of These syringes are intended to be disposable. Therefore, costs must be kept as low as possible.

The present invention is characterized in that the above assembly can be prepackaged in a state displaced inside. The species mentioned in the preamble to claim 1, which can be produced at a very low cost. syringes of the same type.

For this purpose, the syringe according to the invention is characterized in the features of claim 1. It has the following characteristics.

After pushing the above assembly inward for the first time following suction of air, Buri's stroke increases. Therefore, push the above assembly inward for the second time. Connection with the needle leg only takes place after it has been pushed in.

A first embodiment of the syringe according to the invention comprises the further features listed in claim 2. Characteristics. On the other hand, claims 3 and 4 provide for premature displacement of the ring. It describes further advantageous features to prevent this.

Claims 5, 6, and 7 relate to modifications. Here, the ring is It is expandable outwards and does not lose its functionality as it ages. Also, request Items 8 and 9 of the claims describe an example of elasticity of 1 lug. Box 10 relates to a preferred embodiment of a syringe casing according to the invention.

Claim 11 is directed to a second improvement on the syringe according to the earlier Dutch patent application mentioned above. Regarding the second embodiment.

Claims 12 to 16 relate to preferred embodiments of the needle leg latch: Claims 17 to 20 provide a special needle cap for such a syringe. Regarding the

Claims 21 to 27 relate to further embodiments. ring is case is housed in the ring in a non-displaceable manner. Displace the piston/piston rod assembly When the piston/piston rod assembly and the ring cooperate, the ring rotates. That is, in the distal position of the assembly, the abutment surface of the ring is rotates and pushes the assembly into the casing over an increased stroke length You will be able to

Hereinafter, the present invention will be further explained with reference to the drawings.

FIG. 1 is a sectional view of a first embodiment of a syringe according to the invention.

2A to 2C are partial cross-sectional views of the syringe, respectively.

3A-3D are partial cross-sectional views of the distal end of the syringe, showing the connection between the needle leg and the piston. The latch connection means are shown.

4 is a sectional view of the distal end of a variant of the syringe according to FIGS. 1 and 2; FIG.

FIG. 5 is a sectional view of a corresponding part of a second embodiment of a syringe according to the invention.

6A to 6C show a variant of the syringe according to FIG. 5 in different positions; It is.

7A to 7C show a third syringe according to the invention shown in three different positions. FIG. 3 is a partial cross-sectional view of a part of the embodiment.

FIG. 8 is a schematic illustration of a needle cap for such a syringe.

FIG. 9 is an exploded perspective view of a fourth embodiment of a syringe according to the invention.

10A-10J are highly simplified illustrations of continuous operation of the syringe of FIG. FIG.

11A to 11D are schematic diagrams showing corresponding parts of a modification of the syringe of FIG. 9.

FIG. 1 shows a first embodiment of a syringe according to the invention. The syringe is approximately cylindrical The casing 1 is gripped at a distance from the open end 2. The ring 3 has a tapered protrusion 4 at the other end. The protrusion has a substantially conical surface 5. It is connected to the casing 1 via.

The needle leg 6 is pushed into the casing 1 from the open end 2. A hollow needle 7 is fixed to the needle leg. It is installed in a fixed position. The needle is a bush provided on a protrusion 4 that gradually becomes thinner. It protrudes displaceably to the outside via 8. The needle leg 6 abuts against the conical connecting surface 5. , if a longitudinal force is applied on the needle 7, e.g. The needle leg should be is fixed so that it cannot be displaced in the manner described below.

When assembling such a syringe, remove all parts from the open end 2 to the casing. All you have to do is slide them into 1 one after another. That is, first pass the needle 7 through the bushing 8. It is pushed in and then fixed to the needle leg 6 (for example using adhesive). Then the needle The leg 6 together with the needle 7 and bushing 8 is slipped into the casing 1. The protrusion 4 During the passage, the needle 7 is guided along the axial direction accordingly, so as to prevent damage to it. (see FIGS. 3B and 3C, discussed below).

After inserting the piston 9 into the casing 1, the abutment part (see Fig. (not shown) is provided.

Such a syringe is shown, for example, in earlier patent application no. 9000487 mentioned above. For the use of separate needles that are installed from the outside, as described in is also clearly suitable.

The assembly of the piston 9 and the piston rod 10 connected thereto is also included in the casing. inserted into group 1. The piston rod 1o has a pressing surface 11 at its free end. The piston rod 10 can be operated by the pressing surface. Piston 9 is an example For example, it has a sealing ring 12 that seals liquid against the inner wall of the casing 1; It is provided with a conical surface 13 on the side facing the needle leg 6. The needle leg 6 has a corresponding conical surface. 14, which is the dead space when the piston 9 is fully pushed in. is to be made as small as possible.

Furthermore, the means described below is such that when the piston 9 is fully pushed in, the piston 9 and the needle leg part 6, and is provided to simultaneously release the lock of the needle leg part 6. Ru. In addition, this means allows the needle leg 6 to connect to the needle 7 after the connection and unlocking. Both are intended to be drawn into the inside of the casing 1.

As more clearly disclosed in FIG. 2, near the open end of the casing 1 , a large number of inwardly elastic tongues 15 are provided. Piston rod 1 0, two parts with a smaller diameter are formed, which allow the two Support surfaces 16 and 17 are constructed. 17 with a smaller diameter is placed on the piston side. It is placed. In the case shown here, and also referring to FIG. 2B, the piston rod The door 10 is formed in the shape of a cross and these support surfaces are arranged in its ribs.

On the support surface 16 located on the outside, in the initial state, a split ring etc. An inwardly directed elastic ring 18 is present. Even if you use a coil spring instead good. This ring rests on the support surface 16 with inward tension.

As shown in FIG. on which the ring 18 can be held against accidental displacement. You can do it like this.

FIG. 2A shows an initial state in which the ring 18 is outside the tongue 15. It is positioned in When air is inhaled and then forced out into the storage bottle The piston rod that has passed through the tongue piece 15 can be suppressed inward from the position shown in Fig. 1. I can't. At this time, the ring 18 abuts against the abutment shoulder 20. Because this condition The outer diameter of the ring 18 is larger than the inner diameter of the casing 1 at this shoulder 20. This is because it makes you listen. As a result, the stroke length of the piston 9 is increased by the stroke length of the needle leg 6. The length is limited to such a length that it is neither possible to release the lock nor connect it to the needle leg 6. It will be done. Here, as shown in FIG. 1, the tongue piece 15 grips the rear side of this ring. There is.

When the piston wood 10 is moved back again to aspirate the injection solution, the tongue piece 15 The ring 18 is held and displaced onto the support surface 17. The diameter of the ring is its inward direction. decrease as a result of sex. This allows the ring 18 to be released from the end of the tongue 15. It is released and the piston rod is therefore withdrawn unhindered. Rin The outer diameter of the plug is again smaller than the inner diameter of the casing 1. Next note In the process of pushing the piston rod 10 inward to discharge the injection liquid, the piston The stone 9 can be suppressed up to the needle leg portion 6. In this process, transform 13 and 14 into conical shapes. This allows virtually all of the injection solution to be drained. This is an expensive injection Particularly preferred in cases where

As soon as the piston 9 reaches the needle leg 6, the needle leg is unlatched and the two are connected. tied. Therefore, when the piston rod 10 is pulled out, the needle leg is also pulled out. The needle 7 will be placed inside the casing 1. like this In this state, the entire device can be discarded. Furthermore, with the piston rod 10 again The needle can also be destroyed by pressing. In this case, bend the tip of the needle somewhat. or somewhat eccentrically, and abut against the end face of the bush 8 or the conical surface 5, Just break it so you can no longer use the needle. Furthermore, the passage inside Bushu 8 is very narrow. Therefore, the chance of the needle re-entering this passage is very small.

The means for latching the needle leg 6 within the casing 1 and for connecting the piston 9 to the needle leg 6 are , which can be provided in a variety of ways. FIG. 3 shows an example thereof.

As shown in FIG. 3A, the end of the casing 1 has a circumferential surface at an angle of 120°, for example. An inner shoulder portion 21 is provided which is branched along. The end 1- of the casing 1 is It is slightly narrow and can be elastically deformed. When assembling the syringe, the needle leg When the section 6 is slid in from the open end 2, the casing end 1' and further the needle leg 6 The needle leg portion 6 is also slightly deformed, and finally the needle leg portion 6 is joined to the rear portion of the shoulder portion 21. Piston 9 inside When fully pushed in, the piston deforms the casing end 1' somewhat and , the shoulder portion 21 moves rearward. At the same time, the knob 22 on the surface of the piston head It is pushed into the correspondingly shaped quadrant 23 of the needle leg 6 and connected thereto. instructor The completed assembly can then be retracted over shoulder 21.

3B and 3C show a modification of the needle leg 6 and piston 9. piston head The door 13 is formed into a gentle conical shape as in FIG. Corresponding to needle leg 6 A conical surface 14 is provided. The needle leg 6 has one or more protruding hooks 24. do. These hooks are easily assembled in a single operation, as shown in Figure 3B. It is adapted to protrude outward in the transverse direction in the released state so as to Kick the needle leg 6. - In the process of sliding into the thing 1, these hooks 24 bend inward. , the hook is horizontal to the inner wall of the casing 1. Piston 9 is completely inside When pushed in, the ends of these hooks 24 engage the piston head 13 and the sealing ring. 12, and the connection is easily performed. For example, the hook 24 is 3 As shown in the figure, it is arranged in the space between the protrusions 21. in this case , the piston rod has three ribs.

FIG. 3C further shows that the bushing 8 is placed on the needle 7 before introducing the needle leg 6, as described above. It indicates that it is placed on top. This allows the needle to pass through the wider protrusion 4. This is to guide you.

As shown in FIG. 3D, the casing 1, needle leg 6, and piston 9 are arranged in a triangular shape. It is configured to have a cross section. The piston rod 10 is provided with three ribs. It is. Therefore, the piston 9 and the needle leg 6 are guided in a non-rotatable manner within the casing 1. It will be done. The protrusion 21 is arranged on the side wall of the triangular casing, but the hook of the needle leg 24 is provided facing a part of the corner. When pushing the piston 9 completely inward Then, the protrusion 21 is pushed away by the inclined piston head 13. This behavior Since the leg 6 is released by , after the hook 24 engages with the piston 9, the needle leg The part 6 together with the piston 9 can be drawn inward.

This has the advantage that the position of the hook 24 with respect to the protrusion 21 is clearly fixed. The point is that Furthermore, a syringe constructed in this way will not roll; The flat surface allows the casing 1 to be brought closer to the skin during injection. There is an advantage. These advantages can also be achieved using other non-circular cross sections. Of course. All parts are injection molded from plastic material. This is possible due to the fact that it can be manufactured using molds, etc.

In the embodiment according to Figures 1 and 2, after removing the syringe from the package, There is a risk that the stone rod may be accidentally pushed into the position shown in FIG. the spot If the ring 18 is placed on the support surface 17 after retracting the piston to suck air, This may remove the stroke limit. prevent this For this purpose, the embodiment according to FIG. 4 is used. Here, in the initial state, the ring 18 is placed, and another surface 26 having a larger diameter is connected to the support surface 16. are doing. The tongue piece 15 is provided with an abutment surface 27 on its outer side. Ring 18 is In the initial state, it is placed on the contact surface 27, so the piston rod 10 is Pushing to the side is thereby prevented. Pull out the piston rod 10 to the outside. The ring 18 is then held by one or more abutment surfaces 28 on the other side of the tongues 15. so that the ring 18 is pressed against the first support surface 16. piston rod 1 When 0 is pushed back inside to expel air, it slides out from under the contact surface 27. The diameter of the ring decreases until After that, the operations described with reference to FIGS. 1 and 2 are performed. I can continue. The contact portion 28 is, for example, shifted in the circumferential direction with respect to the tongue piece 15. will be placed. In the initial position, ring 18 is locked between joints 27 and 28. and is released from both abutments during displacement towards the surface 16.

In the embodiment according to FIGS. 1, 2 and 4 with inward elastic rings, long storage During this period, the ring 18 may lose some of its elasticity. Then, During displacement, the outer diameter of the ring does not become sufficiently small, causing the ring to come into close contact with the support surface 17. do not have. Therefore, in the end, the piston rod 10 cannot be pushed inward enough. It disappears.

The preferred embodiment shown in FIG. The operations performed are not affected by external influences. The ring 18 is shown here at the end 2. The end face 31 of the ring 18 is placed on two enlarged sheet parts having stacking direction fighting parts 30. is pressed against this shoulder portion 30. The ring 18 has an inclined surface 3 which is flared toward the end. 3, and the terminal end has a slightly inclined end surface 34. .

The piston rod 10 shown in its initial position is approximately flush with the inner surface 33 of the ring 18. It has a drawer 35 connected to a substantially parallel slope 36. Piston mouth/socket In the lower part of the piston rod there is a central opening 37, which allows the piston rod intermediate part 38 has some elasticity in the inward direction. Slanted shoulder 3 substantially parallel to end face 34 of ring 18 9 is provided on the outside of the hook 35.

When the piston rod 10 is pushed in when discharging air after suction, the surface 36, the hook 35 is attached to the rear side of the shoulder portion 32 while the intermediate portion 38 is elastically deformed. Slide on surface 33 until mated. The inclined shoulder portion 39 abuts the end surface 34 As a result, the piston rod 10 is further pushed inward, and the piston 9 moves to the needle leg. It is prevented from being connected to section 6.

When the piston rod 10 is pulled back to aspirate the injection, the hook 35 is released. 18. After the ring leaves the seat portion 29, it expands outward and is compressed. Further expansion is achieved by further expansion of the piston rod intermediate portion 38. next When the piston rod 10 is pushed inward once again to expel the injection liquid, the phosphorus The end surface 31 of the rod 18 abuts against the leading surface 20 of the casing 2 . Ring 18 is displaced Then, the inclined surface 33 passes through the inclined shoulder 39 and reaches the widened end of the piston rod 10. Moving towards section 40, the ring widens further. In this way, the stroke control Since the limitation is eliminated, the connection between the piston 9 and the needle leg 6 becomes possible.

Also in this case, the piston rod 10 is accidentally pushed inward from the initial position, There is a risk that the hook 35 will engage the shoulder 32.

FIG. 6A shows a modified example in which filling is performed between the hook 35 and the shoulder 39 in the seat portion 29. A piece 41 is provided. This filling piece is connected to the casing 1 by a flexible strip. May be continued. Filler piece 41 prevents piston rod 10 from being pushed inward However, when the piston rod 10 is pulled out for the first time, it is pulled out by the hook 35. is pulled out. This means that the cross section 43 of the piston rod 10 is This is because it engages with the ejection hook 35. The filling pieces may then fall off. The strip remains connected to the strip 42. Split rings may be used instead of filler pieces. stomach. This, like ring 18, can slide over the piston rod end. can.

Figures 6B and 6C show two positions where the piston rod is innermost. . That is, the positions after evacuation of air and liquid, respectively. Filling piece 41 is already , and these positions therefore equally apply to the example according to FIG. . In the position shown in FIG. 60, the shoulder portion 3o of the piston rod 1o is completely attached to the seat portion The ring 18 is placed on the ring 18, and the stroke length inward is limited. . On the other hand, in the position shown in FIG. 60, the ring 18 is displaced onto the piston rod portion 4o, It is held by the end surface 2C1' of the casing end 2. At this time, the stroke length is No longer limited.

FIG. 7 shows yet another embodiment, in which the stroke limiting means is arranged near the piston 9. has been done. The piston also has two pairs of hooks 44 and 45, and hook 44 (Both have elasticity in the outward direction.) Each of the hooks 44 has an inclined surface on the piston side. 46, with a straight leading surface 47 on the opposite side. The piston rod 1o is the top surface 46 on the rear surface of the piston 9 in the initial position shown in FIG. 7A. Being forced. Further, the thin portion 49 is engaged with the inclined surface 46 of the hook 44. An inclined portion 50 is provided. At a certain distance from the inclined part 5o, a thin part Minute 49 is connected to cross section 51 . In this position, the cross section is connected to the second hook 45 is approached or pressed against the end face. In this initial position, the link The hook 18 is placed on the outer surface of the hook 44. The ring 18 is further connected to the casing 1 friction fit against the inner wall of the The hook 44 is locked against outward bending. Because the piston rod is It is fixedly connected to the ton 9.

When air is drawn in, the ring 18 moves with the piston. however, When the piston rod 10 is pushed back for air evacuation, the ring 18 closes the casing. The hook 45 is held back by the friction with the hook 1, as shown in FIG. 7B. Displaced in the direction. The pressing force is applied to the top surface 48 and/or 51 of the piston rod 1o. continues to be transmitted to the piston 9.

As shown in FIG. 70, when the injection solution is aspirated, the traction force is applied to the piston rod 1. Added to 0. The inclined surface 5o of the thin part of the piston rod 49 is connected to the hook 44. It is possible to slide over the corresponding inclined surface 46. So, these The hook bends outward and becomes forceful. After that, the end of the piston rod 1o It will be located between the hooks 44 and 46, and the hook 46 will be removed by the ring 18. Locked against sideways movement.

As shown in FIG. 70, the actual length of the piston rod depends on the length of the hook 44. It increases. thus pushing the piston rod inward for evacuation of the injection solution and piston 9 will be pushed inward over a correspondingly greater distance. Become. This is a sufficient distance to allow connection with the needle leg.

Further abutments (not shown) on the piston rod 10 and the casing 1 ensure that the piston The inward displacement of the stone rod is caused by the piston 9 and the needle leg 6 in the position shown in FIG. The distance may be limited to such a distance that the connection cannot occur. In this state, easily remove the syringe. Can be packaged.

Although the syringes according to Figures 1 to 7 can be packaged in an almost sterile manner, In order to aspirate the liquid from the bottle, it is first necessary to fill the inside of the injection liquid with air. . If this is atmospheric air, the air pressurized into the storage bottle will mix with its contents and the inside of the syringe. There is a risk of contaminating the contents. To prevent this, as shown in Figure 8A, The cap 52 can then be attached to the needle 7. The cap is casing 1 A filter 53 is fitted loosely into the end 4 of the filter to block dust from the air. Ru. The cap must be removed when inserting the needle into the injection container. do not have. The cap may also be provided with a foldable wall 54, as shown in Figure 8B. can. In this case, insert the needle 7 into the end of the cap before inserting the needle into the stopper of the liquid container. It becomes possible to get through it. The cap 52 is folded like an accordion, left around needle 7.

Figure 9 shows the open end of the syringe according to the invention, the piston 9 inserted into the syringe, and the piston. 2 shows yet another embodiment of an assembly of stone rods 10; Here, special Unintentional displacement of the piston rod can be prevented without providing other means. . In this embodiment, the ring 18 is housed in a support surface 29 at the end of the casing 1. has been done. Therefore, although the ring can rotate, it cannot slide and one or more The shoulder, which is held in place by shoulder 55, is elastic when inserting the ring. This prevents the ring from coming off later.

In the illustrated embodiment, the piston rod 10 is provided with three first ribs 56. I'm being kicked. We also provide a piston rod with two ribs on the same plane. It is also possible to operate using only one rib. Shih However, it is preferred to use two or more ribs 56.

Near the outer end of the piston rod 10, each of the ribs 56 is connected to a shorter second rib. 57, which is parallel to and at an angle to the corresponding first rib 56. placed at intervals. Therefore, the second rib 57 corresponding to the first rib 56 In between is arranged an inclined connecting piece, the upper rim 59 of which is chamfered. Piss Near the pressing surface 11 at the end of the tongue rod 10, the rib 57 widens laterally and forms an abutting shoulder. Form 60.

Inside the ring 18, inwardly facing projections 61a, b, c are provided. first The protrusion 61a can be fixed, but the two protrusions 61b and 61c are attached to cut out bullets. It is placed on the sexual tongue piece 62. These tongues cannot be moved outwardly within the support surface 29. It protrudes inward to the extent that it can be The width of the space between the two protrusions 61 is equal to the width of the rib. It approximately corresponds to the thickness of 56 or 57.

Although FIG. 9 shows only one set of protrusions 61, the same number of ribs 56 and 57 are present. Conveniently, a set of projections is provided.

Furthermore, a ring 18 is provided within the outwardly facing rim 63 at each shoulder of the piston rod 1o. A notch 64 is provided in the portion 60 . Notch up to bottom 65 in axial direction The depth corresponds to the stroke increase required to connect the piston to the needle foot. . This is because in the embodiment described above, the ring 18 is slidable. can be obtained.

Before assembly of the syringe and before the sealing ring 12 is placed on the piston 9, a second The ring 1 is arranged so that the rib 57 is accommodated in the space between the corresponding protrusions 61a and 61b. 8 on the piston rod 10. After that, the sealing ring 12 is placed. The entire assembly is pushed into the casing. Finally, the ring has an elastic shoulder 55 Grasp the back of the In this way the ring 18 is fixed within the supporting surface within the casing. When the piston 9 is removed from the casing 1, the protrusion 61 prevents the piston 9 from being pulled out from the casing 1. be done.

The operation of this embodiment will be described below with reference to a simplified diagram shown in FIG. here Here, only a portion of the ribs 56 and 57 of the piston rod 10 are shown, and the protrusion 6 is shown. 1 and a portion of the ring 18 with the notch 64 is also shown.

FIG. 1OA shows the starting position with the piston fully pushed in. this state Packaged syringes are sold at . At this time, the second rib 57 is attached to the protrusion 61 a and 61b, and the shoulder 6o is in contact with the rim 63 of the ring 18. Ru.

As shown in Figure 10B, the piston rod 1o is first When pulled out, the first protrusion 61a moves against the connecting piece 58, and the arrow The ring rotates as shown by the mark. The second protrusion 61b is along the connecting piece on the opposite side, Eventually, the position of FIG. 10C is reached. When the piston rod is pulled out further The rib 56 is located between the protrusions 61g and 61b.

When the piston rod 1o is pushed in again to expel the air, it will be in the position shown in Figure 10D. the protrusion 61b is pushed outward beyond the chamfered rim 59 of the connecting piece 58. The connecting piece 58 can be slid over the connecting piece 58 as shown by the broken line arrow. Figure 10 As shown in E, the rib 57 extends from each of the second and third protrusions 61b and 61c reach between. In the position shown in FIG. 10H, the shoulder 6o is attached to the rim 63 of the ring 18. come into contact with.

The ring rotates as the protrusion 61b slides over the chamfered rim 59 To prevent this, a small guide plate 66 can be provided. This information board parallel to the tab 56, but not clearly seen in FIG. They are arranged at a distance that leaves a passage for the protrusion 61 to pass therebetween.

When the piston rod 1o is pushed in near the position shown in FIG. 10D, this guide plate 66 reaches between the protrusions 61b and 61c and prevents the ring 18 from rotating. At the same time protrusion 6 1b is guided beyond the chamfered edge 59.

In order to aspirate the injection solution, move the piston rod 1o back again from the position shown in Figure 10E. Then, the position shown in FIG. 10F is reached. The ring 18 is as in the position of FIG. 10B. is rotated to When the piston rod 1o is further retreated, the rib 56 is moved as shown in FIG. As shown in G, it moves between protrusions 61b and 61c.

When the ring rotates in the position shown in FIG. Rotate so that it aligns with the direction.

The piston wood is pushed inward again from the position shown in Figure 10G to drain the injection solution. When it reaches the position shown in FIG. 10H, it passes through the position shown in FIG. 10H again. As a result, the protrusion 61c is connected to the connecting piece 5. 8 over the chamfered rim 59. As shown in Figure 10J, The projection 61 finally abuts within the notch 64 against its bottom surface 65. in this position At this point, the piston 9 and the needle leg are connected. The straw obtained by this The increase in arc length is shown as d.

After connection with the needle leg, the needle leg can be retracted inward as in the previous embodiment. . Then, if necessary, the needle is removed by pushing the piston rod 10 inward again. can be destroyed.

FIG. 11 further shows modified examples at positions corresponding to those in FIG. 1OA, B, C, and D. It is shown in a simplified manner. In this variant, the or each rib 56 is on the upper side. is expanded, and the side edge of this expanded portion is aligned with the edge of the corresponding rib 57. There is. A chamfered rim 59 begins at the beginning of this widened section near the inclined connecting piece 58. It is located in Mari. The operation of this embodiment mainly corresponds to the movement shown in FIG. .

FIG. 11A shows the same starting position as that of FIG. 10A. Figure 11B is a ring 18 shows the starting position of rotation. This is because the first protrusion 61a has an inclined end. 58, and the second protrusion 61b crosses the chamfered part 59 to the rib. This is because it slides into the expanded area, and as shown in FIG. in position. Here, at the position of figure LID corresponding to the position of figure 10D, the protrusion is 61b slides off the flared rib 56 and reaches the rear of the sloped edge 58. this In some cases, the small guide plate 66 is not necessary.

In the embodiments of FIGS. 10 and 11, the third protrusion 61c is not strictly necessary. However, this also provides a safeguard against unintentional return rotation of the ring 18. It is.

In the syringe according to Figure 9, under all circumstances and the piston rod itself When the ring 18 rotates relative to the casing 1, the ring 18 is rotated relative to the piston rod 10. and rotate. In the embodiment shown in Figure 9, the casing is triangular so that the piston There is no risk that the ton 9 will rotate. However, it is a cylindrical casing and cannot be rotated. This does not affect the interaction between ring 18 and piston rod 10, even if It has no impact.

Submission of translation of written amendment (Article 184-8 of the Patent Law) May 27, 1994

Claims (1)

[Claims] 1. a casing having an internally displaceable piston/piston rod assembly; and a needle foot latched to a first end of the casing; The piston is connected to the needle leg at the inner end of the needle and the lug of the needle leg is connected to the inner end of the needle. means for releasing the lock and retracting the needle leg together with the piston into the casing, thereby shielding and also destroying the needle connected to the needle leg; When pushing the piston inward for the first time to expel air, make sure to hold the piston in place so that it remains in place from the needle leg. After retracting the piston to aspirate the injection solution, the piston can be repeatedly pushed inward to discharge the injection solution. In a syringe provided with means capable of increasing said stroke length such that a stroke length is connected to the needle leg, said stroke limiting means being displaceable relative to said assembly (9, 10) or said casing (1). Possible and above casing It has a ring (18) that can be engaged with either the piston (1) or the assembly (9, 10), the displacement distance of which is between the piston (9) and the needle leg with a limited stroke length. The distance approximately corresponds to the predetermined distance obtained between the part (6) and the link After first retracting the assembly (9, 10), the casing (18) (1) or the above-mentioned assemblies (9, 10) cooperate to displace the upper The assembly (9, 10) cooperates with the abutment part to limit the inward stroke length of the assembly to a predetermined distance from the needle leg part (6) in the initial position of the ring (18), and the displacement The syringe is characterized in that, in this position, the piston (9) is configured to increase the stroke length in the inward direction so that the piston (9) can connect with the needle leg (6). 2. The piston rod (10) has first and second support surfaces (16, 17) having different lateral dimensions, and the second support surface (17) is separated from the first support surface (16). is arranged axially inwardly and has a smaller diameter than the first support surface; The ring (18) is an inwardly elastic ring which, in its initial position, is clamped against said first support surface (16) and has a first outer dimension, and said second support surface (16). said casing (1, 2) is provided with a lateral abutment shoulder (20), the diameter of which is smaller when displaced in the direction of the support surface (17) of said casing (1, 2). , the ring (18) is of such a size that it contacts it in the initial position and does not contact it in the displaced position, and on the end (12) of the casing that is located outside the outside of the shoulder (20), there is 1. More than one tongue piece (15) having elasticity in the inward direction is provided, and the tongue piece is in the initial position. is located between said ring (18) and said shoulder (20) in the position, and after pressing said assembly (9, 10) until it abuts said shoulder (20), said ring (18) gripping engagement and then retracting the assembly (9, 10) before the link In the syringe, the ring (18) is displaceable from the tongue (15) and the shoulder (20). A syringe according to claim 1, characterized in that: 3. On one side of the piston, the first support surface (16) be delimited by one or more projecting ribs or projections (19) to prevent accidental displacement of the ring (18) towards said second support surface (17); The syringe according to claim 2, characterized in that: 4. On a side remote from said second support surface (17) said first support surface (16) has a third support surface (26) having a larger diameter than said first support surface (16). , said ring (18) is located on said third support surface (26) in an initial position to prevent said assembly (9, 10) from being pushed inwardly. contacting one or more abutting portions (27) provided on the casing (1, 2) or the tongue (15), and an upper portion on the casing (1, 2) or the tongue (15). One or more additional abutments (28) are provided on the other side of the ring (18) and When retracting the assembly (9, 10) outwardly, the ring (18) is A syringe according to claim 2 or 3, characterized in that it is adapted to be moved onto the first support surface (16). 5. Said ring (18) is displaceable at the flared end (29) of said casing end (12) and expandable outwardly, restricted against inward displacement. The inner side of the ring is provided with a shoulder portion (32) having a recessed portion. and this shoulder extends outward toward the side of the casing that is remote from the needle side. Adjacent to the sloping surface (33) that widens toward the end and ends as an outer end surface (34). At the end, the piston rod (10) is provided with a pull-out hook (35), and the pull-out hook (35) The ejecting hook is arranged outside the ring (18) in the initial position, and is attached to the aperture. When the assembly (9, 10) is displaced inwardly, it can be slid onto the inclined surface (33) of the ring, and the pull-out hook ends up in the recessed shoulder (33) of the ring (18). At this time, the inclined shoulder (39) of the piston rod (10) comes into contact with the end surface (34) of the ring (18) and the assembly is held on the rear side. By limiting the inward stroke length of the assembly (9, 10) and then retracting said assembly (9, 10), said ring (18) is pulled out of said enlarged casing part and when it leaves this part. , it becomes possible to expand outward, and this Beyond the distal shoulder (39) of the piston rod (10), the diameter of the piston rod (10) is such that, when the assembly (9, 10) is pushed inward again, The end (31) of the ring (18) When the ring (18) comes into contact with the distal end surface (20) of the casing part (29), the ring (18) is displaced along with its inner inclined surface (33) passing through the inclined shoulder (39), and this The size should be such that the stroke length limit can be removed by The syringe according to claim 1, characterized in that: 6. The portion (38) inside the drawer hook (35) is structured to have elasticity inward. The syringe according to claim 5, characterized in that the syringe is made of: 7. A filling piece (4) is provided outside the ring (18) and inside the flared end (29), the filling piece at least touching the end face (34) of the ring (18) and the piston rod ( 10) substantially fills the space between the distal shoulders (30) of the top The filling piece (4) prevents the assembly (9, 10) from displacing inwardly from the initial position, and when retracting the assembly (9, 10) outward from the initial position, the filling piece (4) 2) The syringe according to claim 5 and 6, wherein the syringe is adapted to be pulled out from the syringe and released from the syringe. 8. A syringe according to any one of claims 1 to 7, characterized in that the ring (18) is a split ring. 9. A syringe according to any one of claims 1 to 7, characterized in that the ring (18) is a coil spring. 10. The casing (1) is provided with a protrusion (4) at its needle-side end, and a bush (8) having a guide hole for the needle is attached to the protrusion. A syringe according to any one of claims 1 to 9, characterized in that: 11. The stroke limiting means is formed by a combination of two pairs of elastic locking protrusions and two flanges on the piston rod or vice versa, the flanges being sloped on the piston side; The distance between the flanged rims is limited Corresponding to a predetermined distance with respect to the stroke length, the piston rod is substantially pressed against the piston at least in an initial position, and the piston rod has an outward direction. For syringes that are equipped with an abutment that limits the stroke in the The inside of the ring (18) is movable around the outside of the lock projection (44, 45), and the outside of the ring (18) is frictionally fitted inside the casing (1), The width of the inner surface of the ring (18) in contact with the ring (44, 45) is less than or equal to the axial length of the lock protrusion (44, 45), and the lock protrusion (44, 45) engaged with the ring A syringe according to claim 1, characterized in that it is adapted to be locked by said ring (18). 12. The needle leg is deflected inwardly by one or more abutting edges of the casing. In syringes that are restricted to position, the container wall (1') and/or the piston The ton (9) completes said piston (9) inwardly along an extended stroke length. When the needle is pushed in completely, the abutment edge (21) is released from the needle leg (6). The syringe according to any one of claims 1 to 11, characterized in that it is deformable. 13. Said needle leg (6) is provided with one or more protruding hooks (24), said hooks being able to press said piston (9) into place when said piston (9) is pushed fully inward. Claim characterized in that the rear side of the edge (25) of the piston (9) can be gripped elastically in order to connect the piston (9) to the needle leg (6). The syringe according to item 11. 14. The container (1), the needle leg (6) and the piston (9) are non-circular, has a rounded triangular cross section, and the protrusion (21) is the part of the wall with the smallest radius. 14. Syringe according to claim 13, characterized in that the hook (24) of the needle leg (6) is located in the part of the wall with the largest radius. 15. The piston (9) and the needle leg (6) are provided with conical surfaces (13, 14) of at least approximately the same shape so that they at least approximately fit into each other when the piston (9) is pushed completely inward. Claims characterized in that The syringe according to any one of items 1 to 14. 16. The casing (1) is provided with an inwardly facing support surface (5) at its needle-side end, and the needle leg is connected between the support surface (3) and the abutment edge (21). In order to lock the needle leg (6), the needle leg (6) is placed against the support surface (5) when displaced into the casing from the other end. Special The syringe according to any one of claims 12 to 15. 17. A needle cap (52) surrounding the needle (7) protruding from the needle leg (6) is provided on the outside of the casing (1), and the needle cap (52) is provided with a sterile empty space. When retracting the assembly (9, 10) for the first time, this The syringe according to any one of claims 1 to 10, wherein sterile air is aspirated. 18. Syringe according to claim 17, characterized in that the needle cap (52) is provided with an inhalation filter. 19. 19. A syringe according to claim 17 or 18, characterized in that the wall (54) of the square cap (52) is foldable during suction of air. 20. Said needle cap (52) is accordion-shaped and its closed end is pierced by said needle tip to expose said needle (7). 20. The syringe according to any one of claims 13 to 19, characterized in that the cap (52) can be compressed rearward. 21. Cases with internally slidable piston/piston rod assemblies a needle foot latched to the first end of the casing; Connecting the piston to the needle leg at the inner end of the assembly, unlatching the needle leg, and pulling the needle leg together with the piston into the casing. Means are provided for blocking and even destroying the needle connected to said needle foot, and said piston and other means are provided for evacuation of air. The stroke length is limited so that the piston remains at a predetermined position from the needle leg when the needle is pushed inward, and the piston is retracted to aspirate the injection solution. The syringe is provided with means capable of increasing the stroke length so that the piston is connected to the needle leg when the piston is repeatedly pushed inward to discharge the injection solution after the injection has been completed. The stroke limiting means is rotatable. a non-displaceable ring (18), and is provided with first and second abutment surfaces (63, 65), which are arranged axially offset from each other and with a limited distance between them. in this ring (18) at least approximately corresponding to the predetermined distance obtained between said piston (9) and said needle foot (6) in a stroke length; The ring rod (10) is displaceable, and after the second retraction of the piston rod, the ring (18) is rotated by mutual interaction with the piston rod (10). When the piston rod (9) is pushed inward again so that the piston (9) is connected to the needle leg (6), the abutment (60) on the piston rod (10) A syringe characterized by being in contact with a second contact surface (65) of a piston rod (10). 22. The piston rod (10) is provided with one or more ribs (56), each of the ribs relative to the first rib near the free end (11) of the piston rod (10). Parallel second ribs (57) are arranged offset in the circumferential direction, and an inclined connecting piece (58) is arranged between these ribs (56, 57). The ring (18) is provided with one or more sets of at least two inwardly directed protrusions (61a, 61b, 61c), and the corresponding ribs (61a, 61b, 61c) of the piston rod (10) are provided between these protrusions. 56, 57), the second and, optionally, a set of second and third protrusions (61b, 61c) can be elastically moved slightly outwardly; The protrusions (61) can alternately slide along the inclined connecting pieces (58) and rotate the ring (18) accordingly when the piston rod (10) is pulled out; When pushing the ring (10) inward, the second and possibly the second and third protrusions (6 1b, 61c) move elastically to prevent the ring (18) from rotating. 22. Syringe according to claim 21, characterized in that it can be slid onto an inclined connecting piece. 23. The second and optionally each set of the second and third protrusions (61b, 61c) and/or the inclined connecting piece (58) have a chamfered portion (59) for easy sliding. 23. The syringe according to claim 22, wherein the syringe is provided with: 24. The second and optionally each set of said second and said third protrusions (61b, 61c) are attached to elastic tongues (62) formed within said ring (18). The syringe according to claim 21 or 23, characterized in that: 25. At least one of the first ribs (56) of the piston rod (10) Next to the rib (56), place a small guide plate (66) oriented parallel to the rib (56). The guide plate is provided at a distance approximately equal to the width of the second and, as the case may be, a set of second and third protrusions (61b, 61c), and the guide plate extends from the inclined connecting piece (58) to the second and third protrusions (61b, 61c). Claims 21 to 21, characterized in that the guide plate (66) terminates at a distance at least equal to the width of the projection and prevents rotation of the ring (18) when retracting the piston rod (10). The syringe according to any of paragraph 24. 26. The or each first rib (56) is connected to the inclined connecting piece (58). It is considerably wider than the second rib (57) at the part where it connects, and the piston When pulling the connecting rod (10) outward, said second and optionally said second and third protrusions (61b, 61c) are placed on this expanse in an outwardly bent position. The syringe according to any one of claims 22 to 25, characterized by: 27. Said second and optionally said second and said third protrusions (61b, 61c) and/or said second or each first rib (56) have this extension. 27. The syringe according to claim 26, further comprising a chamfered portion on which the projection can easily slide.